Zeitschriftenartikel zum Thema „Zn 6050“
Um die anderen Arten von Veröffentlichungen zu diesem Thema anzuzeigen, folgen Sie diesem Link: Zn 6050.
Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an
Machen Sie sich mit Top-50 Zeitschriftenartikel für die Forschung zum Thema "Zn 6050" bekannt.
Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.
Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.
Sehen Sie die Zeitschriftenartikel für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.
1
Dong, Xiaofei, Jianping Xu, Hui Yang, Xiaosong Zhang, Zhaojun Mo, Shaobo Shi, Lan Li und Shougen Yin. „Effect of Ligand Exchange on the Photoluminescence Properties of Cu-Doped Zn-In-Se Quantum Dots“. Journal of Electronic Materials 47, Nr. 4 (04.01.2018): 2241–48. http://dx.doi.org/10.1007/s11664-017-6050-3.
Der volle Inhalt der Quelle
2
De Mille, Carson, Nicholas K. Gabler und Eric R. Burrough. „PSVII-5 Zinc overload in weaned pigs: tissue accumulation, pathology, and growth impacts“. Journal of Animal Science 97, Supplement_2 (Juli 2019): 215. http://dx.doi.org/10.1093/jas/skz122.378.
Der volle Inhalt der QuelleAnnotation:
Abstract Pharmacological concentrations of zinc (Zn, 2000-3000 ppm) are commonly fed to nursery pigs. However, diet manufacturing errors can result in supra-pharmacological concentrations of Zn (>4000 ppm) being fed. Clinical and phenotypic data reflective of Zn associated morbidity in modern genotype pigs are poorly defined. Therefore, the study objective was to characterize the effect of dietary Zn overload on nursery pig performance, body mineral concentrations and pathologic changes. Fifty-five 21 d old weaned pigs (4.50 ± 0.2 kg BW) were randomly assigned to one of five Zn diet treatments for 21 d. Diets included: 1) Control no additional Zn (NC), 2) 6000 ppm Zn for 21 d (Zn6), 3) 6000 ppm Zn for 7 d plus 4000 ppm Zn for 14 d (Zn64), 4) 3000 ppm Zn for 7 d and no additional Zn for 14 d (Zn3), and 5) 3000 ppm Zn for 7 d plus 2000 ppm for 14 d (Zn32). All pigs were bled and weighed at d 0, 7 and 21, and ADFI and G:F were determined for the overall 21 d test period. Thereafter, all pigs were necropsied for histopathology and serum, tissue and feed trace mineral concentrations were determined. Data were analyzed by one-way ANOVA with Tukey-Kramer adjustment in JMP. Overall pig ADG, ADFI and G:F was not statistically different between treatments. Feeding greater than 6000 ppm Zn increased pancreatic Zn concentrations compared to other groups (P < 0.001), and pancreatic apoptosis was more frequent in pigs fed supra-pharmacological levels of Zn (P < 0.0001). Hepatic and serum Zn levels were highest in diet 2 and 3 pigs compared to the other diets (P < 0.0001 and P = 0.0003 respectively) and only pigs from these treatments had serum Zn >2.0 ppm or hepatic Zn >500 ppm. Accordingly, these mineral levels should warrant further feed analysis if expected inclusion rates are 3,000 ppm Zn or less.
3
Djalovic, Ivica, Muhammad Riaz, Kashif Akhtar, Goran Bekavac, Aleksandar Paunovic, Vladimir Pejanovic, Sajjad Zaheer und P. V. Vara Prasad. „Yield and Grain Quality of Divergent Maize Cultivars under Inorganic N Fertilizer Regimes and Zn Application Depend on Climatic Conditions in Calcareous Soil“. Agronomy 12, Nr. 11 (31.10.2022): 2705. http://dx.doi.org/10.3390/agronomy12112705.
Der volle Inhalt der QuelleAnnotation:
The variations in temperature and rainfall patterns under climate change are threatening crop production systems, and optimizing fertilization practices is a prerequisite for sustainable cereal production. This two-year field study investigated the effects of eight treatments (T1: P60K60; T2: P60K60 + Nmin spring; T3: P60K60 + N40autumn + Nmin spring; T4: P60K60 + N60spring; T5: P60K60 + N100spring; T6: P60K60 + N40autumn + N60spring + Zn; T7: P60K60 + N60autumn + N80spring + Zn; and T8: P60K60 + N160spring + Zn) on the grain yield and quality of four divergent maize cultivars (NS-4023, NS-640, NS-6010 and NS-6030). The observations on climatic data showed substantial variations in monthly and cumulative rainfall only, which was 174 and 226 mm for 2011 and 2012, respectively, and much less than the historical cumulative rainfall of 339 mm. However, temperature during growth years showed little deviation from the historical data. The data showed that treatment and maize cultivar significantly influenced grain yield; however, grain yield remained lower in 2012 than in 2011 for each treatment and cultivar. Applying N as split doses in combination with Zn, resulted in higher grain yields than adding at once. However, the treatments and cultivars affected grain quality variables differently, including oil, thiol SH, phytate, inorganic P, soluble protein, starch, total phenol, protein, total sugars and tryptophan contents. Despite the pronounced difference in grain yields between 2011 and 2012 for each treatment and cultivar, grain quality did not always vary significantly between cultivars. Principal component analysis (PCA) revealed that the relationships between grain yield and grain quality varied significantly during 2011 and 2012. The changes in rainfall patterns at critical growth maize stages seemed to be a more important factor than temperature in regulating the response of maize cultivars in terms of grain yield and quality to various fertilization regimes in this study.
4
Delville, Alfred, und Christian Detellier. „Zn(II)–D-(−)penicillamine complexes in aqueous solution. Zn-67 nuclear magnetic resonance study“. Canadian Journal of Chemistry 64, Nr. 9 (01.09.1986): 1845–49. http://dx.doi.org/10.1139/v86-303.
Der volle Inhalt der QuelleAnnotation:
D–(−)-Penicillamine interactions with Zn(II) have been studied in aqueous solutions as a function of pH, penicillamine concentration, and temperature, using Zn-67 nuclear magnetic resonance. Longitudinal and transverse relaxation rate measurements show the presence in solution of complexes in fast exchange with the aquated Zn(II) cation, and belonging to the extreme narrowing regime. Using equilibrium constant values from the literature, the relaxation behaviour was modelled. Characteristic Zn-67 line width values for the two complexes Zn(Pen) (v = (6200 ± 500) Hz) and [Zn(Pen H)]+ (v = (6000 ± 1000) Hz) were found. Equality of the two values is in agreement with zinc chelation by the sulfhydryl and the amino groups.
5
Reese, R. N., und G. J. Wagner. „Properties of tobacco (Nicotiana tabacum) cadmium-binding peptide(s). Unique non-metallothionein cadmium ligands“. Biochemical Journal 241, Nr. 3 (01.02.1987): 641–47. http://dx.doi.org/10.1042/bj2410641.
Der volle Inhalt der QuelleAnnotation:
The chemical and physical characteristics of Cd-binding peptides isolated from tobacco (Nicotiana tabacum) leaves and suspension-cultured tobacco cells were determined and compared with properties of rat liver Cd, Zn-thionein. Some emphasis was placed on metal-binding and specificity properties. Cd-peptides of apparent Mr 6000 and 2000 were induced in tobacco leaves by growth of plants with 90 microM-Cd. Only the apparent-Mr-2000 Cd-peptide was induced in the leaves of tobacco plants grown in the presence of 3 microM-Cd. In cultured tobacco cells exposed to a wide range of Cd levels (3-180 microM), a peptide of apparent Mr 2000 was observed. Under denaturing conditions [6 M-guanidinium chloride (GdmCl) with or without 100 mM-2-mercaptoethanol], all of the above forms were shown to have an Mr of approx. 1300, compared with an Mr of 6000 for Cd, Zn-thionein. The apparent disaggregation of the Mr-6000 form by GdmCl to what appears to be the unit Cd-binding peptide was reversible. Tobacco-derived Cd-peptide contained approx. 40, 35 and 15 residues of glutamate/glutamine, cysteine and glycine respectively, with serine, lysine, and aromatic residues being absent. Tobacco Cd-peptide had an isoelectric point (pI) of 3.15, which is lower than the pI greater than or equal to 4 reported for metallothionein. A 50% dissociation of Cd occurred at pH 5 and 3.5 for the tobacco Cd-peptide and Cd, Zn-thionein respectively, and GdmCl was shown to cause Cd dissociation from tobacco peptide, but not from metallothionein. No evidence was obtained for Zn induction in vivo of, or Zn binding in vitro to, tobacco Cd-peptide. Copper induced a low-Mr metal-binding component in cultured tobacco cells which did not appear to be identical with the peptide induced by Cd. Properties of tobacco Cd-peptide and Cd, Zn-thionein, including metal affinity and selectivity, are greatly different, except for the common presence of 30 residues of cysteine/100 residues.
6
Al-Rawi, D. S., und N. M. Abood. „Response of Oats Cultivars to Spraying with Nano and Mineral Zinc and Potassium on Yield and its Components“. IOP Conference Series: Earth and Environmental Science 904, Nr. 1 (01.11.2021): 012050. http://dx.doi.org/10.1088/1755-1315/904/1/012050.
Der volle Inhalt der QuelleAnnotation:
Abstract A field experiment was carried out at Al-Hamidhiya research station of the College of Agriculture - University of Anbar, located within 43.39 longitude, 33.44 latitude and 53 m heights above sea level during Winter seasons 2018-2019 and 2019-2020, with aim of studying the effect of levels of potassium fertilizer, nano and mineral zinc on the yield of three oat cultivars. The split-split-plot arrangement was used according to a randomized complete block design (RCBD) with three replications. The main plots included potassium concentrations (0, 6000, 3000 nm, and 6000 nm) mg K l-1, while the subplot included zinc concentrations (0, 50 and 50 nm) mg Zn l-1, while the cultivars were in the sub-sub plots (Hamel, Carrolup and Genzania). The results of the study indicate that the varieties differed significantly in all studied traits. Genzania cultivar outperformed in terms of grain yield (6.25 and 6.19 ton ha-1) and biological yield (16.37 and 16.26 ton ha-1) the two seasons, respectively. In addition, spraying zinc on the plant had a positive role in improving the yield and its components, as the treatment 50 mg Zn L-1 gave grain yield of 6.24 and 6.06 tons’ ha-1 for both seasons respectively, adding potassium improved the components of the yield, which was reflected in the yield in which the treatment 6000 nm mg K L-1 was superior with seed yield of 7.05 and 6.84 ton ha-1 for the two seasons respectively. Also, the two-way interaction between the concentrations of potassium and zinc, potassium and cultivars, and zinc and cultivars had a significant effect on most of the studied traits. The three-way interaction between the study factors had a significant effect on the studied traits, which was evident in seed yield, as the combination (Genzania sprayed with 3000nm K + 50 mg Zn L-1) gave the highest grain yield of 8.30 for the first season, while the plants of the variety Hamel sprayed with 6000nm K + 50 mg Zn L-1 gave the highest grain yield of 7.440 ton ha-1 for the second season.
7
Patil, Suwarna B., Shweta M. Dhage, Pradeep S. Umap, S. V. Ghorpade und Shyamkant Patharwat. „Cartridge based nucleic acid amplification test: a sensitive diagnostic tool for tuberculosis on fine needle aspirates samples“. International Journal Of Community Medicine And Public Health 7, Nr. 4 (26.03.2020): 1511. http://dx.doi.org/10.18203/2394-6040.ijcmph20201465.
Der volle Inhalt der QuelleAnnotation:
Background: The extrapulmonary tuberculosis (EPTB) is challenging to diagnose due to its pauci-bacillary nature. According to recent research, WHO recommends cartridge based nucleic acid amplification test (CBNAAT) to be used as initial diagnostic test in suspected cases of extrapulmonary tuberculosis. Aim of the present study is to assess the role of CBNAAT in comparison with cytomorphological features upon fine needle aspiration cytology (FNAC) and Ziehl-Neelson (ZN) stain in clinically suspected cases of EPTB.Methods: Present pilot study is descriptive cross-sectional study of 439 cases of clinically suspected EPTB over a period of 12 months (January 2019 to December 2019). After procedure of fine needle aspirates, smears were stained with routine H&E, papanicolaou stain and ZN stain. In the same setting, aspirate was also sent for CBNAAT. Results were obtained after detailed study.Results: Out of 439 cases, presumptive tuberculosis was diagnosed in 192 cases showing either epithelioid cell granulomas or caseous necrosis or both upon morphology, while overall 94 cases were positive on ZN stain and 146 cases were CBNAAT positive with the sensitivity of 84.04% and specificity of 80.57%.Conclusions: FNAC is the cheapest and simplest method to diagnose extrapulmonary tuberculosis, however those smears where tuberculosis cannot be diagnosed on FNAC like suppurative lesions, reactive lymphadenitis and low cellularity, CBNAAT plays a key role for the correct diagnosis thereby significantly reducing the morbidity and mortality.
8
Stamatelos, Ilias, Cao Thang Dinh, Werner Lehnert, Joachim Pasel und Meital Shviro. „Zn-Based Catalysts for Selective and Stable Electrochemical CO2 Reduction at High Current Densities“. ECS Meeting Abstracts MA2023-02, Nr. 58 (22.12.2023): 2802. http://dx.doi.org/10.1149/ma2023-02582802mtgabs.
Der volle Inhalt der QuelleAnnotation:
The development of low-cost and stable catalysts is important for lowering the capital and operational cost of CO2 electro-reduction (ECR). Zinc (Zn) is an earth-abundant metal, with promising performance for the CO2-to-CO conversion.1 Zinc oxide (ZnO) has been recently employed for the CO2-to-CO conversion, recording promising selectivity (FECO) but short-term stability, in Flow-Cell configuration.2,3 ZnO phase has been proven critical for competent ECR performance, since both the oxidation state of Zn and the Zn/ZnO interface are proven critical for high FECO. 4,5In our work 6, we have synthesised various ZnO allotropes, the properties of which induced differences in their ECR performance. We have identified the ZnO nanorods (ZnO-NR) as the best performing catalyst. The latter was implemented in a zero-gap ECR electrolyser (MEA), recording partial current density for CO (jCO) of 160 mA cm-2 at cell voltage of 3.6 V. We have correlated the depletion of the ZnO phase in the MEA with the degradation of the performance (initially 15 h stability). We applied a periodic oxidation protocol in the MEA, causing the regeneration of ZnO-phase, allowing us to prolong the life-time of the catalyst. Through our strategy we were able to record 82% CO selectivity (FECO) for over 100 h, at -160 mA cm-2. This work provides an approach of practical use of inexpensive Zn-based catalysts for large-scale ECR applications. (1) Luo, W.; Zhang, J.; Li, M.; Züttel, A. Boosting CO Production in Electrocatalytic CO2 Reduction on Highly Porous Zn Catalysts. ACS Catal. 2019, 9 (5), 3783–3791. https://doi.org/10.1021/acscatal.8b05109. (2) Zeng, J.; Fontana, M.; Sacco, A.; Sassone, D.; Pirri, C. F. A Study of the Effect of Electrode Composition on the Electrochemical Reduction of CO2. Catalysis Today 2021. https://doi.org/10.1016/j.cattod.2021.07.014. (3) Zong, X.; Jin, Y.; Li, Y.; Zhang, X.; Zhang, S.; Xie, H.; Zhang, J.; Xiong, Y. Morphology-Controllable ZnO Catalysts Enriched with Oxygen-Vacancies for Boosting CO2 Electroreduction to CO. Journal of CO2 Utilization 2022, 61, 102051. https://doi.org/10.1016/j.jcou.2022.102051. (4) Nguyen, D. L. T.; Jee, M. S.; Won, D. H.; Jung, H.; Oh, H.-S.; Min, B. K.; Hwang, Y. J. Selective CO2 Reduction on Zinc Electrocatalyst: The Effect of Zinc Oxidation State Induced by Pretreatment Environment. ACS Sustainable Chem. Eng. 2017, 5 (12), 11377–11386. https://doi.org/10.1021/acssuschemeng.7b02460. (5) Geng, Z.; Kong, X.; Chen, W.; Su, H.; Liu, Y.; Cai, F.; Wang, G.; Zeng, J. Oxygen Vacancies in ZnO Nanosheets Enhance CO2 Electrochemical Reduction to CO. Angewandte Chemie International Edition 2018, 57 (21), 6054–6059. https://doi.org/10.1002/anie.201711255. (6) Stamatelos, I.; Dinh, C.-T.; Lehnert, W.; Shviro, M. Zn-Based Catalysts for Selective and Stable Electrochemical CO2 Reduction at High Current Densities. ACS Appl. Energy Mater. 2022. https://doi.org/10.1021/acsaem.2c02557. Figure 1
9
Das, Sonu, Mathew John und Supriya Adiody. „Relevance of copper/zinc ratio and its association with redox status in chronic obstructive pulmonary disease“. International Journal Of Community Medicine And Public Health 11, Nr. 6 (30.05.2024): 2291–95. http://dx.doi.org/10.18203/2394-6040.ijcmph20241487.
Der volle Inhalt der QuelleAnnotation:
Background: Chronic obstructive pulmonary disease is a progressive and persistent inflammatory condition associated with significant morbidity and mortality. Increased oxidative stress amongst others, plays an important role in the pathogenesis of this disease. The objective of the present study was to conduct a preliminary yet comprehensive examination of metal exposure specifically copper and zinc levels and their association with overall oxidative stress in COPD. Methods: A cross sectional study was carried out in a tertiary care hospital in South India. Two groups were included in the study. One group with 20 COPD patients and the other group of 20 healthy controls. Plasma samples were obtained from both the groups and serum levels of copper and zinc were studied by atomic absorption spectrometry. Cu/Zn ratio obtained from the results was further correlated with oxidative stress index calculated from total oxidant status and total antioxidant status in COPD with respect to controls. Results: The copper levels were significantly higher and the zinc levels lower in the COPD group as compared to the control group. The copper/zinc ratio was higher in COPD as compared to control population. The correlation between Cu/Zn ratio and oxidative stress index showed a positive correlation with a regression coefficient of 0.7. Conclusions: The study throws light on the trace element imbalance in COPD and how these could induce oxidative stress, contributing to persistent inflammation in COPD. In the clinical perspective, monitoring Cu/Zn ratio in COPD patients may lead to better risk mitigation and thereby better therapeutic management of the disease.
10
Sarkees, Nazy A., und Bilal I. Mohammed. „Peanut Yield and Oil Response to Application Methods and Zinc Concentration“. Tikrit Journal for Agricultural Sciences 23, Nr. 3 (30.09.2023): 22–31. http://dx.doi.org/10.25130/tjas.23.3.3.
Der volle Inhalt der QuelleAnnotation:
From the field of Khabat Technical Institute- Erbil Polytechnic University the research was conducted in the summer season of 2021. It shows peanut yield and oil response to application methods and zinc concentration. A factorial experimental design was applied in a randomized complete block design (RBCD) with replications; the first factor represents seed treatment by four concentrations of Zinc (0, 1, 2 and 3 g Zn kg seed-1) and second factor was a foliar spray application by four concentrations of Zinc (0, 2000, 4000 and 6000 Zn mg liter-1). The combined effect of seed treatment by 1 g Zn kg seed-1 and 2000 mg liter-1 of zinc foliar spray application, produced the highest value of a number of pod plant-1, pod and seed yield (kg ha-1), oil and protein yield (kg ha-1), but the seed treatment by 2 g Zn kg seed-1 and 4000 mg liter-1 of zinc foliar application surpassed in weight of 100 pod (g), weight of 100 seed, oil and protein percentage while 1 g Zn kg seed-1 and 4000 mg liter-1 of zinc obtained the heights branches of plant-1. The interaction between seed treatment 1 g Zn kg seed-1 with 2000 mg liter-1 of zinc foliar application recorded the highest number of pod plant-1, seed yield (kg ha-1), oil percentage, oil and protein yield (kg ha-1). The interaction treatment 2 g Zn kg seed-1 with 4000 mg liter-1 of zinc recorded the highest value in weight of 100 pods (g), weight of 100 seed, pods yield (kg ha-1) and protein percentage
11
Colonia, Roberto, Vanessa C. Martinez, José L. Solís und Mónica M. Gómez. „SÍNTESIS Y CARACTERIZACION ESTRUCTURAL Y MORFOLÓGICA DE NANOPARTÍCULAS DE ZNO2 ASISTIDO CON UV PARA APLICACIONES BACTERICIDAS“. Revista Cientifica TECNIA 23, Nr. 1 (12.03.2017): 17. http://dx.doi.org/10.21754/tecnia.v23i1.63.
Der volle Inhalt der QuelleAnnotation:
El peróxido de zinc (ZnO2) fue sintetizado en forma de nanopartículas por medio de la ruta sol-gel. Para la síntesis se empleó acetato de zinc di-hidratado (Zn(CH3COO)2.2H2O) y peróxido de hidrogeno (H2O2) al 30% asistido de radiación UV. Las nanopartículas de ZnO2 obtenidas fueron caracterizadas estructuralmente mediante la técnica de difracción de rayos-X. Mientras que el estudio de la morfología y tamaño de conglomerados cristalinos, se realizó por microscopía electrónica de barrido. Para explorar las propiedades bactericidas del ZnO2, se realizaron pruebas preliminares en las que se enfrentó este material a las cepas: Bacillus subtilis (ATCC 6051), Escherichia coli (ATCC 25922) y Staphylococcus aureus (ATCC 25923), y se observó que las nanopartículas presentan una notoria propiedad bactericida.. Palabras clave.-Peróxido de zinc, Nanopartículas, Bactericida. ABSTRACTZinc peroxide (ZnO2) nanoparticles were synthesized by sol-gel technique. The chemicals used for the synthesis were zinc acetate di-hydrate (Zn(CH3COO)2.2H2O) and hydrogen peroxide (H2O2) at 30% under UV radiation. The structure of the ZnO2 nanoparticles was characterized by X-ray diffraction. While the morphology and the cluster size, were determined using scanning electron microscopy. For a preliminary evaluation of the bactericidal properties of the ZnO2, the material was exposed to Bacillus subtilis (ATCC 6051), Escherichia coli (ATCC 25922) y Staphylococcus aureus (ATCC 25923) and it was found that the material has notorious antibacterial activity. Keywords.-Zinc peroxide, Nanoparticles, Bactericidal.
12
Druzhinina, Olga, Laura Gedminienė und Kasper van den Berghe. „Metals in Lake Sediments as Indicators of Human Activities in Prehistory: Case Study of the Southeastern Baltic, Kamyshovoe Lake“. Minerals 12, Nr. 10 (27.09.2022): 1216. http://dx.doi.org/10.3390/min12101216.
Der volle Inhalt der QuelleAnnotation:
This paper presents the results of geochemical research on the Kamyshovoe Lake sediments (Kaliningrad oblast, Russian Federation). The study of Pb, Ni, Zn, As, Co and Cu concentration and enrichment factors (EF) combined with the results of the lithological, geochronological, magnetic susceptibility and microcharcoal studies revealed possible anthropogenic sources of metals in southeastern Baltic lake sediments from the Neolithic to the Medieval period. Increasing Co EF value and peaks of the Pb EF in Kamyshovoe Lake sediments, starting from ~6000 cal yr BP in the Neolithic, probably show the growing role and usage of metals as dyes and fixatives. Since ~3100 cal yr BP, in the end of the Bronze Age, a simultaneous increase in the content of indicators of metallurgical production Pb, Ni, Zn and As, coinciding with growth of the microcharcoal curve, can show a growing demand for metal objects in the southeastern Baltic region and the input of the local or regional ancient metallurgy into the metal pollution of the lake sediments.
13
Степанова, М. В., Н. Г. Ярлыков und Е. М. Лапина. „Influence of Feeding Cows on the Quality and Chemical Composition of Milk“. Vestnik APK Verhnevolzh`ia, Nr. 4(56) (30.12.2021): 45–51. http://dx.doi.org/10.35694/yarcx.2021.56.4.008.
Der volle Inhalt der QuelleAnnotation:
В настоящее время при высоком уровне техногенного загрязнения окружающей среды с учётом недостаточной агротехнической культуры при производстве продукции наблюдается тенденция к увеличению загрязнения пищевого сырья и продукции растительного и животного происхождения, в том числе и тяжёлыми металлами. Цель исследования – выявление влияния рациона питания коров на качество и химический состав молока питьевого. Микроэлементы Zn, Cu, Fe, Cd и As способны кумулироваться в кормовых составах в концентрациях, превышающих максимально допустимый уровень (МДУ) (наибольшее количество отклонений установлено в отношении Fe– 60,0% компонентов). Скармливание таких кормов дойным коровам в составе рациона, с учётом поступления из внешней среды, приводит к всасыванию этих элементов в кровь в количестве, превышающем пределы физиологической нормы организма животного, из крови они мигрируют в продукцию (молоко). Анализ элементного состава рациона показал несбалансированность поступления – превышение рекомендуемых значений: Zn – в 55,56 раза; Cu – в 3,33–40 раз; Fe – в 2,96–19,71 раза; Pb – в 6 раз ниже рекомендуемой суточной потребности. Cd с пищей поступает в пределах суточной потребности, а As – на верхней границе рекомендуемой нормы. Но миграция исследуемых элементов в молоко выше установленных предельно допустимых концентраций (ПДК) в отношении поллютантов не выявлена. Исследуемое питьевое молоко соответствует качеству по органолептическим, физико-химическим и микроэлементным показателям. В хозяйстве рекомендовано проводить мониторинговые исследования по определению уровня накопления химических элементов в объектах окружающей среды для точного установления суточного поступления ксенобиотиков, расширить перечень исследуемых микроэлементов в продукции и дополнить рацион пищевыми добавками, препятствующими кумуляции токсикантов в биосубстратах и миграции в питьевое молоко. Currently, with a high level of technogenic pollution of the environment, taking into account the insufficient agricultural culture in the production of products, there is a tendency to increase the pollution of food raw materials and products of vegetable and animal origin, including heavy metals. The goal of the research is to identify the influence of the diet of cows on the quality and chemical composition of drinking milk. Trace elements Zn, Cu, Fe, Cd and As are able to cumulate in feed compositions at concentrations exceeding the maximum permissible level (MPL) (the largest number of deviations was set in relation to Fe – 60.0% of components). Feeding such feeds to milk cows as part of the diet, taking into account the supply from the external environment, leads to the absorption of these elements into the blood in an amount exceeding the limits of the physiological norm of the animal's body, from the blood they migrate to production (milk). Analysis of the elemental composition of the diet showed an imbalance in receipt – exceeding the recommended values: Zn – 55.56 times; Cu – 3.33–40 times; Fe – 2.96–19.71 times; Pb is 6 times lower than the recommended daily requirement. Cd with food comes within the daily requirement and the As at the upper limit of the recommended norm. But the migration of the examined elements into milk above the established maximum permissible concentrations (MPC) in relation to pollutants has not been revealed. The drinking milk under investigation corresponds to the quality according to organoleptic, physicochemical and microelement indicators. It is recommended to conduct monitoring studies on the farm to determine the level of accumulation of chemical elements in environmental objects in order to accurately establish the daily intake of xenobiotics, expand the list of examined trace elements in products and supplement the diet with food additives that prevent the cumulation of toxicants in bio-substrates and migration to drinking milk.
14
Campbell, Robert N., Michael K. Leverentz, Louise A. Ryan und Richard J. Reece. „Metabolic control of transcription: paradigms and lessons from Saccharomyces cerevisiae“. Biochemical Journal 414, Nr. 2 (12.08.2008): 177–87. http://dx.doi.org/10.1042/bj20080923.
Der volle Inhalt der QuelleAnnotation:
The comparatively simple eukaryote Saccharomyces cerevisiae is composed of some 6000 individual genes. Specific sets of these genes can be transcribed co-ordinately in response to particular metabolic signals. The resultant integrated response to nutrient challenge allows the organism to survive and flourish in a variety of environmental conditions while minimal energy is expended upon the production of unnecessary proteins. The Zn(II)2Cys6 family of transcriptional regulators is composed of some 46 members in S. cerevisiae and many of these have been implicated in mediating transcriptional responses to specific nutrients. Gal4p, the archetypical member of this family, is responsible for the expression of the GAL genes when galactose is utilized as a carbon source. The regulation of Gal4p activity has been studied for many years, but we are still uncovering both nuances and fundamental control mechanisms that impinge on its function. In the present review, we describe the latest developments in the regulation of GAL gene expression and compare the mechanisms employed here with the molecular control of other Zn(II)2Cys6 transcriptional regulators. This reveals a wide array of protein–protein, protein–DNA and protein–nutrient interactions that are employed by this family of regulators.
15
AKSOY, Esra Güler, Nurten BAHTİYAR, Gamze KARAKULLUKÇU SAVAŞ, Leyla SEVİNÇ AVŞAR, Betül Nur ÇOBAN KAYAN, Nermin AKDEMİR, Birsen AYDEMİR und Fatma Behice CİNEMRE. „Evaluation of Oxidative Stress and Trace Elements in Term and Late-Term Pregnancies“. İstanbul Gelişim Üniversitesi Sağlık Bilimleri Dergisi, Nr. 21 (08.01.2024): 854–65. http://dx.doi.org/10.38079/igusabder.1374236.
Der volle Inhalt der QuelleAnnotation:
Amaç: Gebelik, yüksek metabolik turnover (yapım-yıkım) ve doku oksijen kullanımı nedeniyle oksidatif stresin hakim olduğu fizyolojik bir durumdur. Çalışmamızda, gebeliğin term ve geç-term dönemlerinde oksidatif hasar belirteci olan malondialdehit (MDA) ve iskemi-modifiye albümin (IMA) ve bazı eser element düzeylerindeki değişiklikleri araştırmak amaçlandı. Yöntem: Çalışmada, sefalik prezentasyonlu ve anne yaşı 18-40 arasında olan term (n=80) ve geç-term (n=64) dönemlerinde olan toplam 144 tekil gebenin olduğu bireyler değerlendirildi. Serum IMA düzeyleri albumin kobalt bağlama (CAB) testi ve MDA düzeyleri tiyobarbitürik asit reaktif maddeler (TBARS) yöntemi ile ölçüldü. Selenyum (Se), demir (Fe), bakır (Cu), mangan (Mn) ve çinko (Zn) düzeyleri indüktif eşleşmiş plazma optik emisyon spektrofotometresi (ICP-OES, Thermo iCAP-6000) ile ölçüldü. Bulgular: Serum MDA ve IMA düzeylerinin geç-term grupta term grubundan yüksek olduğu, fakat serum Zn, Cu ve Se düzeyleri geç-term gebelerde term gebelere göre daha düşük olduğu bulunmuştur. Fe ve Mn değerlerinde anlamlı bir değişim bulunmamaktadır. Sonuç: Çalışmamızda, gebeliğin geç-term dönemlerinde oksidatif stres belirteçleri olarak IMA ve MDA düzeylerinin yükseldiği yani oksidatif stresin arttığı belirlenmiştir. Bu bulgular, gebeliğin geç-term dönemlerinde bu oksidatif stresin kaynağı ve etkilerinin araştırılmasına ışık tutacak öncül sonuçlardır.
16
Hamghavandi, Mohammad Ranjbar, Arash Montazeri, Ahmad Ahmadi Daryakenari und Malihe Pishvaei. „Preparation and characterization of chitosan/graphene oxide nanocomposite coatings on Mg–2 wt% Zn scaffold by pulse electrodeposition process“. Biomedical Materials 16, Nr. 6 (07.09.2021): 065005. http://dx.doi.org/10.1088/1748-605x/ac1f9f.
Der volle Inhalt der Quelle
17
Maderthaner, Magdalena, Alexander Jarosik, Gerhard Angeli und Roland Haubner. „3rd Generation Hot-Dip Galvanized Steel Sheet for Automobile Manufacturing - Interface Reactions between Zinc and Metal Oxide“. Key Engineering Materials 742 (Juli 2017): 463–70. http://dx.doi.org/10.4028/www.scientific.net/kem.742.463.
Der volle Inhalt der QuelleAnnotation:
There is a growing demand for Advanced High Strength Steels (AHSS) in the automotive industry owing to their high specific strength and good formability. The mechanical properties satisfy the demands for improved passenger safety and decreased vehicle weight due to thinner cross sections. Hot-dip galvanizing is a common procedure to prevent corrosion of steel, galvanized steel forms the basis for further processing like organic coating. Industrially, the steel strip is annealed at 840 °C in 5 % H2 in N2 at a dew point (DP) of -30 °C. These conditions are reducing for Fe, but oxidizing for oxygen-affine alloying elements as Mn, Si and Cr. These ignoble elements form an external, covering oxide layer on the steel surface, which exhibits poor wettability for the Zn(Al, Fe)-bath. The liquid Zn(Al, Fe) has a temperature of 460 °C and contains 0,2 wt% Al to form a Fe2Al5-xZnx-layer to inhibit the growth of Fe-Zn-intermetallics. Along with the increased amount of alloying elements to improve strength and ductility of AHSS the evolving oxide layer after annealing at the steel surface deteriorates hot-dip galvanizing. The question arises what happens to the surface oxides during immersion in the Zn(Fe, Al)-bath. For this purpose annealed as well as annealed and galvanized 0.8Si-AHSS and 1.5Si-AHSS were compared by glow discharge optical emission spectroscopy (GD-OES) depth profiles. Galvanized specimens show fewer oxides at the steel-zinc-interface as annealed specimens. A possible explanation is an aluminothermic reduction of oxides by 0.2 wt% dissolved Al in the Zn(Al, Fe)-bath. Al is thermodynamically more affine to oxygen than Mn and Si and may reduce Mn- and Si-oxides. An alternative theory is the dissolution of Fe in Zn during reactive wetting, as a side effect the oxides are rinsed off too. Additionally, the influence of DP was investigated. According to Wagner’s theory of selective oxidation, a higher amount of oxygen in the annealing atmosphere leads to internal oxidation of the alloying elements. Experiments were carried out with 0.8Si-AHSS and 1.5Si-AHSS by altering the DP during annealing from -30 °C (380 ppm H2O) to 0 °C (6000 ppm H2O). Oxidation mode changed from external (DP -30 °C) to internal oxidation along grain boundaries (DP 0 °C), as predicted by Wagner. These oxide-free surface provides good reactivity to enhance reactive wetting with the Zn(Fe, Al)-bath and form a dense Fe2Al5-xZnx-layer.
18
I.T, Asowata, und Omokolade O.G. „Trace elements characterisation in floodplain soils underlain by crystalline rocks, akure, southwestern Nigeria“. International Journal of Advanced Geosciences 7, Nr. 1 (05.05.2019): 31. http://dx.doi.org/10.14419/ijag.v7i1.25901.
Der volle Inhalt der QuelleAnnotation:
The results of the floodplain soils study on the spatial distribution of selected trace elements in top soils (0 – 30 cm) and sub soils (> 30 – 100 cm) near Ala River, Akure metropolis, are reported. The objectives of this study are to determine the concentration of trace elements in the top and bottom soils, and identify the possible enrichment sources of these elements in the floodplain area. Forty two samples (top soil 21; sub soil 21) were collected for the study. The samples were air dried at room temperature, disaggregated and sieved using 53 µg mesh size. The prepared samples were further digested using modified aqua regia of (1:1:1 HNO3: HCL: H2O). The digests were subjected to elemental analysis using Inductively Coupled Plasma-Emission Spectrometry (ICP-MS). The trace elements concentration in ppm exhibited the following distribution pattern. Cu range in ppm from 6.0 – 53.0 mean 27.43; Pb, 10.0 – 165.0, mean 58.43; Zn, 29.0 – 479.0 mean 223.1; Ni, 10.0 – 20.0, mean 14.86; Co, 16.0 – 33.0, mean 24.29; Mn, 250.0 – 1615.0, mean 983.29; Th 9.0 – 19.0, mean 14.43; V, 35.0 – 89.0, mean 73.05; La 26.0 – 84.0, mean 56.76 and Cr 11.0 – 60.0 mean 40.43. While the result for the sub soils range in ppm, Cu from 3.0 – 51.0, mean 21.24; Pb, 7.0 – 208.0, mean 56.33; Zn, 21.0 - 460.0. mean 149.14; Ni, 8.0 – 29.0, mean 13.76; Co, 12.0 – 37.0, mean 23.95; Mn, 138.0 – 2283.0, mean 806.43; Th 9.0 – 28.0, mean 17.48; V, 40.0 – 105.0, mean 68.71; La 25.0 – 96.0, mean 61.00 and Cr 12.0 – 58.0 mean 35.38. The results of both the top soils and sub soils showed higher concentration metal enrichment than the average shale values. The relative elemental mean concentration is such that Mn> Zn > V > La > Pb > Cr > Co > Cu > Th > Ni in that order. Elements such as Cu, Zn, Pb, V, Mn, Th and Cr had relatively moderate to very strong correlation coefficient (r = 0.54 0.97) with each other, which apparently indicate that these elements are of same source of enrichment in the floodplain. Pb, Zn, V, La, Th and Cr are elements that are of significant environmental concerns.
19
Valdez, Socorro, M. Suarez, O. A. Fregoso und J. A. Juárez-Islas. „Microhardness, Microstructure and Electrochemical Efficiency of an Al (Zn/xMg) Alloy after Thermal Treatment“. Journal of Materials Science & Technology 28, Nr. 3 (März 2012): 255–60. http://dx.doi.org/10.1016/s1005-0302(12)60050-4.
Der volle Inhalt der Quelle
20
Schenk, Gerhard, Lyle E. Carrington, Susan E. Hamilton, John de Jersey und Luke W. Guddat. „Crystallization and preliminary X-ray diffraction data for a purple acid phosphatase from sweet potato“. Acta Crystallographica Section D Biological Crystallography 55, Nr. 12 (01.12.1999): 2051–52. http://dx.doi.org/10.1107/s0907444999012597.
Der volle Inhalt der QuelleAnnotation:
Purple acid phosphatase from sweet potato is a homodimer of 110 kDa. Two forms of the enzyme have been characterized. One contains an Fe–Zn centre similar to that previously reported for red kidney bean purple acid phosphatase. Another isoform, the subject of this work, is the first confirmed example of an Fe–Mn-containing enzyme. Crystals of this protein have been grown from PEG 6000. They have unit-cell parameters a = b = 118.4, c = 287.4 Å and have the symmetry of space group P6522, with one dimer per asymmetric unit. Diffraction data collected using a conventional X-ray source from a cryocooled crystal extend to 2.90 Å resolution. The three-dimensional structure of the enzyme will provide insight into the coordination of this novel binuclear metal centre.
21
Jegede, D. O., J. F. Oluyomi, O. S. Shokunbi, O. J. Oyewola, A. A. Ogunnowo, R. O. Animashaun und M. D. Afolabi. „Assessment of Physicochemical Parameters and Heavy Metals in Sagamu Abattoir Waste Water Ogun State, Nigeria“. Journal of Applied Sciences and Environmental Management 26, Nr. 5 (31.05.2022): 955–60. http://dx.doi.org/10.4314/jasem.v26i5.24.
Der volle Inhalt der QuelleAnnotation:
Abattoir wastewater is a great threat to environmental safety. This study was aimed at assessing the physiochemical constituents using standard methods and some heavy metals using Agilent Microwave Atomic Emission Spectrometer (MP-AES) 4200 model after sample digestion of wastewater from three (3) major abattoirs in Sagamu, Ogun State, Nigeria. The sample was digested using a mixture of nitric acid, hydrochloric acid and hydrogen peroxide. The digested samples were then analyzed for heavy metals. Data from the physicochemical characterization show that pH, TS, TDS, TSS and COD ranged from; (5.8 – 6.2), (11500 – 27733.33), (5500 – 9066.67), (6000 – 18666.67), and (1507.67 – 3671) respectively. The assessed heavy metals are in the range (mg/L): Zn (0.132-0.337), Cu (0.091 – 0.516), Mn (0.410 – 0.994), Fe (5.294 – 15.44), V (0.132 – 0.32), Cd (0.036 – 0.119), Ni (0.029 – 0.17), Pb (0.136 – 0.234), Cr (0.299 – 1.277), and Co (0.015 – 0.079). Zn, Cu and Fe are essential metals within tolerable limits except Mn that exceeded the limits of World Health Organization (0.04 mg/L) but below Federal Ministry of Environment (5 mg/L) while Ni, Pb and Chromium are above permissible limits in all samples. The pretreatment of the wastewater before discharging into environment is highly recommended and more research should be done on remediation to reduce the abattoir wastewater heavy metals concentration and the effect it is having on the ecosystem and the environment at large.
22
Huang, Shaojun, Lingyue Zhu, Shouwen Jiang, Wanying Zhai, Binbin Pan, Zhichao Wu und Qianghua Xu. „Metal Accumulations in Two Extreme-Environment Amphipods, Hadal Eurythenes gryllus and Antarctic Pseudorchomene plebs“. Journal of Marine Science and Engineering 11, Nr. 8 (29.07.2023): 1515. http://dx.doi.org/10.3390/jmse11081515.
Der volle Inhalt der QuelleAnnotation:
The hadal zone and Antarctic Ocean are two of the least-explored habitats. Knowledge about human impacts on these two extreme environments is limited. Here, we analyzed the metal accumulations of two amphipod species, Eurythenes gryllus, from the Mariana Trench (6040 m, 11.36° N, 142.41° E) in the West Pacific Ocean, and Pseudorchomene plebs, from the Ross Sea (600 m, 77.12° S, 167,67° E) in the Antarctic. Bioaccumulation of thirteen elements (Na, Mg, K, Ca, Cu, Fe, Al, Cr, Mn, Zn, As, Se, and Cd) in three tissues (exoskeleton, leg muscle, and gut) of the two amphipods was investigated using inductively coupled plasma mass spectrometry (ICP-MS). Comparing the trace element concentrations between the different amphipoda species, we found higher element concentrations in the Antarctic amphipod, and an oligotrophication of the Mariana Trench. The concentrations of Cu, Zn, As, and Se in the three tissues all had a significant difference in abundance, and the Cd in the gut of P. plebs was comparably higher than that in E. gryllus, consistent with special environment adaptation. Compared with non-abyssal and shallow water decapoda and amphipoda species, hadal amphipods possessed comparably higher concentrations of Cd and Cr elements and displayed a very high environmental specificity for amphipods’ metal-element bioaccumulation strategy. This study reveals the amphipods of remote and uncontaminated areas as potential indicator species for metal-element bioaccumulation to measure anthropogenic impacts.
23
Kütter, Vinícius, Vanessa Moreira, Mateus Kütter, Emmanoel Silva-Filho, Eduardo Marques, Jeremie Garnier und Edison Bidone. „Metal bioavailability and distribution in the fish community in a tropical estuary, Sepetiba Bay, Rio de Janeiro, Brazil“. Geochimica Brasiliensis 35, Nr. 1 (20.04.2021): 17–38. http://dx.doi.org/10.21715/gb2358-2812.2021351017.
Der volle Inhalt der QuelleAnnotation:
Sepetiba Bay has a wealth of fish species (total 148) as well as a vast area of mangroves and numerous rocky islands, which are important sites of reproduction for marine life. This peculiar environment of the Brazilian coast hosts one of the most important industrial centres of south-eastern Brazil. This site has been impacted for decades by the release of industrial emissions and effluents with high metal loads by the steel industry. The ranges of metal concentrations in fish muscle from the species Micropogonias furnieri, Genidens genidens, Cathorops spixii, Notarius grandicassis, Diapterus rhombeus, Selene vomer, Prionotus punctatus, Citharichthys spilopterus, Achirus lineatus, Trinectes paulistanus, Symphurus tessellatus and Hypanus guttatus were measured (Al: 0.02-555.9 µg g-1 d.w., As: 0.0002-20.1 µg g-1 d.w., Cd: <0.0002-0.2 µg g-1 d.w., Cu: 0.2-2.3 µg g-1 d.w., Fe: <0.02-244.9 µg g-1 d.w., Zn: 0.5-227.3 µg g-1 d.w. and Pb: <0.001-1.3 µg g-1 d.w.). The Kruskal-Wallis test revealed significant differences (p<0.05) in the As, Cu, Fe, Pb and Zn contents among fish species. The monitoring of suspended particulate matter during dredging operation revealed the mean metal values for Al (6059±6268 µg g-1), Cd (0.2±0.5 µg g-1), Cu (29±29 µg g-1), Zn (332±892 µg g-1), and Pb (52±70 µg g-1). The results of bioaccumulation in fish calculated from the bioavailable sediment fractions and suspended particulate matter showed lower values than those in fish muscle. Arsenic was found at levels above the maximum limit for human consumption according to Brazilian legislation. However, the estimated probability and risk of metal intake via fish consumption showed that the consumption of all species presented low risk.
24
Le, Hung T. „Evaluation of dietary supplementation of organic minerals on survivability and feed efficiency in larval rearing of striped catfish (Pangasianodon hypophthalmus)“. Journal of Agriculture and Development 19, Nr. 05 (30.10.2020): 55–61. http://dx.doi.org/10.52997/jad.7.05.2020.
Der volle Inhalt der QuelleAnnotation:
Microminerals of Zn, Se, Cu, Fe, Mn and Cr were supplemented in the feed either in inorganic minerals (sulfate salt) or organic minerals (Methionine-mineral) at various concentrations over an 8-week period. Catfish fry (15-day old) were fed the experimental diets for 8 weeks. At the end of the feeding trial, fish were challenged by immersion in a solution of Edwardsiella ictaluri bacteria. The mortality was monitored for 14 days. The results showed that the survival rates of fish fed the organic mineral-supplemented diets were higher than those fed the inorganic mineral-supplemented diets. Treatment 7 supplemented with organic minerals of 60.0 mg/kg Zn, 0.40 mg/kg Se and 0.40 mg/kg Cr had the highest weight gain and survival rates and the lowest FCR, there were significant differences in those parameters between treatment 7 and the control diet supplemented with inorganic minerals. The variation in fish weight and length of treatment 7 was also lowest and significantly different (P < 0.05) from that of the control treatment. After 14 days of bacteria challenge, the cumulative mortality of fish in the control treatment was highest (67.86%) and the cumulative mortality of fish in treatment 7 was lowest (34.82%), and the cumulative mortality rates of fish in these two treatments were significantly different (P < 0.05) from those of the others. The cumulative mortalities of fish in organic minerals treatments were lower than those of fish in inorganic mineral treatments. The study indicated that the dietary supplementation of organic minerals of zinc (Zn), selenium (Se) and chromium (Cr) would improve growth, survival rate and disease resistance to E. ictaluri bacteria in Pangasius catfish nursing (from 15 to 75 days old).
25
Kayser, T., Farhad Parvizian, C. Hortig und Bob Svendsen. „Application of Adaptive Mesh and ALE Method in Simulation of Extrusion of Aluminum Alloys“. Key Engineering Materials 367 (Februar 2008): 117–23. http://dx.doi.org/10.4028/www.scientific.net/kem.367.117.
Der volle Inhalt der QuelleAnnotation:
The purpose of this work is the modeling and simulation of the material behavior of aluminum alloys during extrusion processes. In particular, attention is focused here on aluminum alloys of the 6000 series (Al-Mg-Si) and 7000 series (Al-Zn-Mg). The material behavior of these alloys during extrusion is governed mainly by dynamic recovery and static recrystallization during cooling. The current material model is based on the role of energy stored in the material during deformation, as it acts as the driving force for microstructural development. The concept of internal variables is used to describe state quantities such as dislocation density, average grain size and average grain orientation. The focus of the current paper is on some of the numerical aspects of the extrusion process simulation such as contact problems and adaptive mesh refinement which should be considered in order to obtain more accurate and robust results.
26
YAO, Lei, Hai HAO, Song-wei GU, Han-wei DONG und Xing-guo ZHANG. „Effects of electromagnetic stirring on microstructure and mechanical properties of super light Mg-Li-Al-Zn alloy“. Transactions of Nonferrous Metals Society of China 20 (Juli 2010): s388—s392. http://dx.doi.org/10.1016/s1003-6326(10)60503-1.
Der volle Inhalt der Quelle
27
Al-Hossainy, Ahmed Farouk. „Simultaneous determination of Cd(II) and Cu(II) using stripping voltammetry in groundwater, soil and Alhagi maurorum plants in industrial and urban areas in Northern Border, Saudi Arabia with luminol as a chelating agent“. Water Science and Technology 72, Nr. 7 (19.06.2015): 1127–39. http://dx.doi.org/10.2166/wst.2015.316.
Der volle Inhalt der QuelleAnnotation:
The cathodic stripping voltammetry of Cu(II) and Cd(II) speciation was re-optimized by using luminol (Lu) in groundwater, soil and Alhagi maurorum plants, finding differences with the pre-existing method and a different interpretation for the electroactive species. The main findings are that optimum sensitivity is obtained at 0.3–142.5 ng/mL and 0.065–60.0 ng/mL for copper and cadmium, respectively, that the complexes responsible for adsorption on the electrode are CuLu and CdLu, and that the sensitivity of the method is much improved in the absence of dissolved oxygen. The limit of detection of the method was 0.011 ± 0.001 ng/mL for Cu(II) and 0.013 ± 0.001 ng/mL for Cd(II). The interference of some common ions: Cr(III), Fe(III), Zn(II), Ni(II), Co(II) and Mo(II) was studied. It was concluded that application of this method for the determination of Cu(II) and Cd(II) in groundwater, soil and Alhagi maurorum plants led to satisfactory results.
28
Ibrahim, Kadhim M., und Shaimaa A. Yousir. „In vivo and in vitro studies on heavy metal tolerance in Sesbania grandiflora L“. Journal of Biotechnology Research Center 3, Nr. 2 (01.06.2009): 48–64. http://dx.doi.org/10.24126/jobrc.2009.3.2.67.
Der volle Inhalt der QuelleAnnotation:
Several experiments were carried out to study heavy metal tolerance in tissue cultures or whole plants of S. grandiflora., Callus was induced and maintained on modified Murashige and Skoog, 1962 medium (MS) supplemented with (0.5)mg/l benzyl adenine and (2)mg/l 2,4-phenoxy acetic acid . Heavy metals (Cd, Co, Cu, Cr or Zn) were added to the culture medium at different concentrations as contamination agents. In order to asses the effect of these heavy metals on seed germination; seeds were sown in soil contaminated with different concentrations of heavy metals for 3 weeks. Atomic Absorption Spectrophotometer was used for analysis of samples taken from whole plants and callus cultures. Results showed that callus fresh weight decreased with increasing heavy metal concentration in cultural medium. Germination percentages and plant heights increased over time. However, a reduction occurred in these parameters with increasing heavy metal levels. Percentages of metals accumulated in calli were (0.001, 0.011, 0.012 and 0.013%) at (0.0, 0.05, 0.075 and 0.1)mg/l Cd respectively; (0.001, 0.008, 0.016 and 0.006%) at (0.0, 0.1, 0.25 and 0.5)mg/l Co respectively; (0.001, 0.020, 0.034 and 0.015%) at (0.0, 0.075, 0.2 and 0.5)mg/l Cu respectively; (0.001, 0.013, 0.012 and 0.010%) at (0.0, 0.25, 0.4 and 0.5)mg/l Cr respectively and (0.027, 0.051, 0.059 and 0.056%) at (0.0 , 0.75, 1.0 and 1.5)mg/l Zn respectively. Percentages of metals accumulated in whole plants were (0.08, 0.55, 1.11, 0.83 and 0.44%) at (0.0, 1.0, 2.0, 3.0 and 4.0)mg/Kg soil Cd respectively; (0.11, 0.22, 0.55, 0.47 and 0.44%) at (0.0, 15.0, 30.0 45.0 and 60.0)mg/Kg soil Co respectively; (0.01, 0.10, 0.57, 0.58 and 0.72%) at (0.0, 25.0, 50.0, 75.0 and 100.0)mg/Kg soil Cu respectively. (0.08, 0.80, 1.28, 1.31 and 0.88%) at (0.0, 25.0, 50.0, 75.0 and 100.0)mg/Kg soil Cr respectively and (0.06, 1.11, 1.20, 1.83 and 2.22%) at (0.0, 100.0, 200.0, 300.0 and 400.0)mg/Kg soil Zn respectively.
29
Relić, Dubravka, Sanja Sakan, Ivan Anđelković, Aleksandar Popović und Dragana Đorđević. „Pollution and Health Risk Assessments of Potentially Toxic Elements in Soil and Sediment Samples in a Petrochemical Industry and Surrounding Area“. Molecules 24, Nr. 11 (06.06.2019): 2139. http://dx.doi.org/10.3390/molecules24112139.
Der volle Inhalt der QuelleAnnotation:
The pollution state and health risk assessment of potentially toxic elements (PTE) in soil and sediment samples of the petrochemical industry and its surrounding area are evaluated in this study. The pseudo-total contents of Ba, Cd, Co, Cu, Cr, Mn, Ni, Pb, V, Zn, As, Hg, and Se were measured by inductively coupled plasma–optical emission spectrometry (ICP/OES) in analyzed samples. Instead of determining total content, we performed aqua regia of the samples. The silicate matrix remained, and the quantities of elements that are within the silicate matrix do not represent an environmental danger. The soils from the chlor–alkali plant are highly polluted by Hg (the enrichment factor values were above 6000), and by Cu, Cd, Pb, and Zn, while the sediment samples from the wastewater channel are polluted with Cr, Cd, and Hg. The measured element contents are used for calculating health risk criteria for a composite worker (a worker who is exposed, long-term, during the work day) and for residential people. Hg is the element that mainly contributes to non-carcinogenic risks within the petrochemical area. The highest value of total carcinogenic risk obtained in the sediment sample from the wastewater channel, and the metal that mostly contributes is Cr. The areas closest to the petrochemical industry have higher values of health risk criteria parameters and pollution indices. The areas that are located further to the north and south from the petrochemical industry are less burdened with the analyzed elements, which is significant because the closest city and village are situated in those directions.
30
Evans, Michael R., Sreenivas Konduru und Robert H. Stamps. „Source Variation in Physical and Chemical Properties of Coconut Coir Dust“. HortScience 31, Nr. 6 (Oktober 1996): 965–67. http://dx.doi.org/10.21273/hortsci.31.6.965.
Der volle Inhalt der QuelleAnnotation:
Physical properties differed significantly among five Philippine-produced coconut (Cocos nucifera L.) coir dust sources. Bulk densities ranged from 0.04 to 0.08 g·cm–3. Air-filled pore space, water-filled pore space, and total pore space ranged from 9.5% to 12.6%, 73.0% to 80.0%, and 85.5% to 89.5% (v/v), respectively. Total solids accounted for 10.5% to 14.5% of total volume, and water-holding capacities ranged from 750% to 1100% of dry weight. Significant differences existed in particle size distribution, with the largest differences occurring for particle sizes <8.0 mm and 0.25 to 0.50 mm in diameter. Chemical properties were determined for 12 sources from the Philippines, Sri Lanka, or Indonesia. The pH and electrical conductivities ranged from 5.6 to 6.9 and 0.3 to 2.9 mS·cm–1, respectively, and were significantly different among sources. No significant differences occurred among samples with respect to Fe, Mn, Zn, B, Cu, NH4-N, and Mg concentrations. Coir dust samples contained Fe, Mn, Zn, B, and Cu at 0.01 to 0.07 mg·L–1. The levels of NH4-N and Mg were 0.1 to 0.2 and 1.0 to 7.4 mg·L–1, respectively. Significant differences occurred between sources for Ca, Na, and NO3-N, with levels (mg·L–1) ranging from 1.0 to 24.3, from 22.3 to 88.3, and from 0.4 to 7.0, respectively. The widest ranges occurred in K (19 to 948 mg·L–1) and Cl (26 to 1636 mg·L–1). Sources differed with respect to cation exchange capacities, with values ranging from 38.9 to 60.0 meq/100 g.
31
Sarfraz, Madiha, Nasar Ahmed, Shabnam Shahida und M. A. Khan. „Structural optical and magnetic properties of transition metal doped ZnO magnetic nanoparticles synthesized by sol-gel auto-combustion method“. Materials Science-Poland 37, Nr. 2 (01.06.2019): 280–88. http://dx.doi.org/10.2478/msp-2019-0029.
Der volle Inhalt der QuelleAnnotation:
AbstractTransition metals, such as chromium (Cr) and manganese (Mn) doped zinc oxide (ZnO) magnetic nanoparticles, were synthesized via sole gel auto-combustion method. The prepared magnetic (Zn1−(x+y)MnxCryO, where x, y = 0, 0.02, 0.075) nanoparticles were calcined in an oven at 6000 °C for 2 hours. The morphologies of the nanoparticles were investigated using different techniques. X-ray diffraction (XRD) analysis revealed that the hexagonal wurtzite structure of the synthesized nanoparticles was unaffected by doping concentration. The crystallite size measured by Scherrer formula was in the range of 32 nm to 38 nm at different doping concentrations. Nanosized particles with well-defined boundaries were observed using a field emission scanning electron microscopy (FE-SEM). Fourier transform infrared (FT-IR) spectra showed a wide absorption band around 1589 cm−1 in all the samples, corresponding to the stretching vibration of zinc and oxygen Zn–O bond. A blue shift in optical band gaps from 3.20 eV for ZnO to 3.08 eV for Zn0.85Mn0.075Cr0.075O nanoparticles was observed in diffuse reflectance spectra, which was attributed to the sp-d exchange interactions. The field-dependent magnetization M-H loops were measured using vibrating sample magnetometer (VSM). The VSM results revealed diamagnetic behavior of the ZnO nanoparticles which changed into ferromagnetic, depending on the doping concentration and particle size. The compositions of Zn, Cr, Mn and O in the prepared samples were confirmed by using the energy dispersive X-ray spectroscopy (EDX). Our results provided an interesting route to improve magnetic properties of ZnO nanoparticles, which may get significant attention for the fabrication of magnetic semiconductors.
32
Singh, Sandeep. „Nutritional status of soils and leaves of guava (Psidium guajava) orchards of Agra district, Uttar Pradesh“. Annals of Plant and Soil Research 24, Nr. 3 (01.08.2022): 355–59. http://dx.doi.org/10.47815/apsr.2022.10175.
Der volle Inhalt der QuelleAnnotation:
A study was conducted on soil and plant nutritional status of guava orchards in order to identify the nutrients that are deficient / low by surveying 100 guava orchards, collection of leaf and soil samples in guava growing Agra district. In general, soils were alkaline in reaction and low in organic carbon. The range (mean) values of available N, P, K and S were 175.0 to 235.0 (196.5 kg ha-1 ), 8.5 to 24.0 (27.5 kg-1 ), 180.0 275.0 (218.5 kg ha-1 ) and 9.0 to 26.0 (15.5 kg ha1 ), respectively in orchard soils. As regards to DTPA extractable Fe, Mn and Cu, the status of these micronutrient cations was adequate in these soils. The soils of guava orchards were deficient in DTPA-Zn to the extent of 45 per cent. Most of the nutrients showed positive relationship with organic carbon content. These elements were negatively related with soil pH and calcium carbonate. The yield limiting nutrients differed from orchards to orchards though some of the nutrients were more prominent. The leaf samples were deficient in nitrogen, sulphur and zinc. On the other hand, P, K, Fe, Cu contents in majority of leaves were in optimum range in guava orchards. The ranges of nitrogen, phosphorus, potassium and sulphur content in guava leaves were from 1.55, to 2.18, to 0.16 to 0.32, 1.20 to 2.10 and 0.18 to 0.35 per cent, respectively. The corresponding ranges of micronutrient cations, i.e. Fe, Mn, Cu and Zn in guava leaves were from 145 to 242, 28.0 to 60.0, 4.5 to 10.6 and 17.5 to 35 mg kg-1 .
33
SINGH, SANDEEP. „Nutritional status of soils and leaves of guava (Psidium guajava) orchards of Agra district, Uttar Pradesh“. Annals of Plant and Soil Research 24, Nr. 3 (01.08.2022): 355–59. http://dx.doi.org/10.47815/apsr.2021.10175.
Der volle Inhalt der QuelleAnnotation:
A study was conducted on soil and plant nutritional status of guava orchards in order to identify the nutrients that are deficient / low by surveying 100 guava orchards, collection of leaf and soil samples in guava growing Agra district. In general, soils were alkaline in reaction and low in organic carbon. The range (mean) values of available N, P, K and S were 175.0 to 235.0 (196.5 kg ha-1), 8.5 to 24.0 (27.5 kg-1), 180.0 275.0 (218.5 kg ha-1) and 9.0 to 26.0 (15.5 kg ha1), respectively in orchard soils. As regards to DTPA extractable Fe, Mn and Cu, the status of these micronutrient cations was adequate in these soils. The soils of guava orchards were deficient in DTPA-Zn to the extent of 45 per cent. Most of the nutrients showed positive relationship with organic carbon content. These elements were negatively related with soil pH and calcium carbonate. The yield limiting nutrients differed from orchards to orchards though some of the nutrients were more prominent. The leaf samples were deficient in nitrogen, sulphur and zinc. On the other hand, P, K, Fe, Cu contents in majority of leaves were in optimum range in guava orchards. The ranges of nitrogen, phosphorus, potassium and sulphur content in guava leaves were from 1.55, to 2.18, to 0.16 to 0.32, 1.20 to 2.10 and 0.18 to 0.35 per cent, respectively. The corresponding ranges of micronutrient cations, i.e. Fe, Mn, Cu and Zn in guava leaves were from 145 to 242, 28.0 to 60.0, 4.5 to 10.6 and 17.5 to 35 mg kg-1.
34
Kuthan, H., H. J. Haussmann und J. Werringloer. „A spectrophotometric assay for superoxide dismutase activities in crude tissue fractions“. Biochemical Journal 237, Nr. 1 (01.07.1986): 175–80. http://dx.doi.org/10.1042/bj2370175.
Der volle Inhalt der QuelleAnnotation:
A sensitive and reliable assay method was developed to characterize crude cell homogenates and subcellular fractions with regard to their superoxide dismutase (SOD) activities. The determination of SOD activities was based on the well-known spectrophotometric assay introduced by McCord & Fridovich [(1969) J. Biol. Chem. 244, 6049-6055], with partially succinylated (3-carboxypropionylated) rather than native ferricytochrome c as indicating scavenger. Partial succinylation of cytochrome c resulted in minimization of interference associated with the interaction of cytochrome c with mitochondrial cytochrome c oxidase or cytochrome c reductases. The further increase in specificity, with regard to exclusion of cytochrome c oxidase interference, gained as a consequence of the high pH of 10 enabled the analysis of samples as rich in cytochrome c oxidase activity as the mitochondrial fraction in the presence or absence of membrane-disrupting detergents. Linear relationships for the dependence of the SOD activities with protein concentration were obtained with rat liver homogenate, mitochondrial and microsomal fractions, indicating negligible interference. Furthermore, by choosing a high pH for the assay medium, a 4-fold increase in sensitivity compared with the classical SOD assay, carried out at pH 7.8, was gained as well as a more precise resolution of Cu/Zn-SOD and Mn-SOD by 2 mM-KCN in samples with a high ratio of Mn-SOD to Cu/Zn-SOD, such as mitochondria. The complete trapping of the O2.- radicals, which was more feasible at pH 10 than at pH 7.8, enabled the application of a simple equation derived for the calculation of appropriately defined units of SOD activity from a single experiment.
35
Azcue, José M., Alex J. Zeman, Alena Mudroch, Fernando Rosa und Tim Patterson. „Assessment of sediment and porewater after one year of subaqueous capping of contaminated sediments in Hamilton Harbour, Canada“. Water Science and Technology 37, Nr. 6-7 (01.03.1998): 323–29. http://dx.doi.org/10.2166/wst.1998.0768.
Der volle Inhalt der QuelleAnnotation:
In this manuscript, we present data from a demonstration in situ capping site (100 m × 100 m) in Hamilton Harbour, Lake Ontario, Canada. A layer of clean medium to coarse sand with the average thickness of 35 cm was placed at the site in the summer of 1995. Concentration of Zn, Cr, and Cd in the original sediments reached values over 6000, 300 and 15 μg/g, respectively. The predicted consolidation of the uppermost one meter of sediment was about 14 cm, which was in good agreement with values obtained from comparisons of moisture content values of pre-capping and post-capping cores. A thin layer of fresh moderately contaminated sediments has started to develop on the top of the cap. In general, the concentrations of elements were greater in porewater than in the overlying water, e.g., the concentration of Fe and soluble reactive phosphorus were 1000 times, and those of Mn 100 times greater. There was a significant reduction in the vertical fluxes of all the trace elements after the capping of the contaminated sediments.
36
Ablakatov, I. K., B. M. Baiserikov, M. B. Ismailov und M. R. Nurgozhin. „Aluminum-lithium alloys: types, properties, application, and production technologies. Overview“. Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 323, Nr. 4 (23.05.2022): 5–14. http://dx.doi.org/10.31643/2022/6445.34.
Der volle Inhalt der QuelleAnnotation:
The article provides a brief overview of the aluminum industry development in Kazakhstan and the possibility of obtaining high-strength structural aluminum-lithium alloys. The country's enterprises produce aluminum of technical purity and aluminum alloys of low and medium strength of 6060, 6063, 6463, 6082, AK5M2, ADS-12, AD-31, AD-35, which are available materials for the construction industry. In Kazakhstan, there is progressive development of mechanical engineering which requires stronger alloys of 300-400 MPa, and for special engineering (defense, aerospace, and other advanced industries) - strengths above 415 MPa. High-strength structural aluminum alloys are based on Al-Cu-Mg, Al-Zn-Mg-Cu, Al-Li systems. Among these systems, relatively new Al-Li alloys are of great interest, having a great potential for further improvement of characteristics. The Al-Li system alloys with record-high specific strengths, corrosion-resistant, and good welded joints are widely used in the aerospace industry, where they are used for the production of power elements and housings. The article provides an overview of the known aluminum-lithium alloys, as well as the main technological stages of their production.
37
Lee, Sseunggyeong, Lee Hyeonseo, Jang-Yeon Hwang und Jaekook Kim. „Role of Conducting Polymer in Aqueous Zinc Ion Batteries“. ECS Meeting Abstracts MA2023-01, Nr. 5 (28.08.2023): 877. http://dx.doi.org/10.1149/ma2023-015877mtgabs.
Der volle Inhalt der QuelleAnnotation:
Owing to high safety and low cost, aqueous rechargeable zinc-ion batteries (ZIBs) is currently a major research topic. In this study, we propose the microwave-assisted hydrothermal synthesis of polypyrrole (PPy)-coated Na1.1V3O7.9 (P-NVO) nanorods for the first time as a highenergy and high-power cathode material for ZIBs. The highly conductive PPy surface-coating layer is significant to enhance the electronic conductivity and Zn2+ diffusion kinetics, leading to utilize the V3+/V4+/V5+ multiple redox reactions of the NVO cathode in ZIBs. Compared to the NVO cathode, therefore, the P-NVO cathode offers higher discharge capacity, power capability and cycling stability; in particular, PPy coating triggers the full theoretical capacity of the NVO cathode (527 mAh g- 1 with ~ 3 mol Zn insertion per formula unit) and directly reflects a superior energy density of 408 Wh kg-1. Even at a high current density of 6000 mA g- 1, the P-NVO cathode sustains 1000 cycles with almost 100% capacity retention. Galvanostatic intermittent titration technique, cyclic voltammetry, in situ X-ray diffraction, and ex situ X-ray absorption near edge structure analyses are combined to verify the superior Zn2+ storage mechanism of the P-NVO cathode.
38
Kaneko, Yuji, Yoshinobu Nishimura, Tatsuo Arai, Hirochika Sakuragi, Katsumi Tokumaru und Daisaku Matsunaga. „UV light and red light chemistry of metallophthalocyanine: wavelength-dependent photochemical reduction of tetrasodium salts of Zn(II) and Cu(II) tetrasulphonatophthalocyanines with amines“. Journal of Photochemistry and Photobiology A: Chemistry 89, Nr. 1 (Juni 1995): 37–44. http://dx.doi.org/10.1016/1010-6030(95)04035-e.
Der volle Inhalt der Quelle
39
Bibiloni, Maria, Alicia Julibert, Cristina Bouzas, Miguel Martínez-González, Dolores Corella, Jordi Salas-Salvadó, M. Zomeño et al. „Nut Consumptions as a Marker of Higher Diet Quality in a Mediterranean Population at High Cardiovascular Risk“. Nutrients 11, Nr. 4 (30.03.2019): 754. http://dx.doi.org/10.3390/nu11040754.
Der volle Inhalt der QuelleAnnotation:
Background: Nut consumption has been associated with improved nutrient adequacy and diet quality in healthy adult populations but this association has never been explored in individuals at high cardiovascular risk. Objective: to assess the associations between consumption of nuts and nutrient adequacy and diet quality in a Mediterranean population at high cardiovascular risk. Design: baseline assessment of nutritional adequacy in participants (n = 6060, men and women, with ages 55–75 years old, with overweight/obesity and metabolic syndrome) in the PREDIMED-PLUS primary cardiovascular prevention randomized trial. Methods: nut intake was assessed using a validated food frequency questionnaire. Participants who reported consuming zero quantity of nuts were classified as ‘non-nut consumers’. ‘Nut consumers’ were participants who reported consuming any quantity of nuts. Nineteen micronutrients were examined (vitamins B1, B2, B3, B6, B12, A, C, D, E and folic acid; Ca, K, P, Mg, Fe, Se, Cr, Zn, and iodine). The proportion of micronutrient inadequacy was estimated using the estimated average requirements (EAR) or adequate intake (AI) cut-points. Diet quality was also assessed using a 17-item Mediterranean dietary questionnaire (Mediterranean diet score, MDS), a carbohydrate quality index (CQI) and a fat quality index (FQI). Results: eighty-two percent of participants were nut consumers (median of nut consumption 12.6 g/day; interquartile range: 6.0–25.2). Nut consumers were less likely to be below the EAR for vitamins A, B1, B2, B6, C, D, E, folic acid, and Ca, Mg, Se and Zn than non-nut consumers. Nut consumers were also more likely to be above the AI for K and Cr than non-nut consumers. Nut consumers had lower prevalence of inadequate micronutrient intakes, but also higher CQI, higher FQI, and better scores of adherence to the Mediterranean diet (Mediterranean diet score, MDS). Conclusions: nut consumers had better nutrient adequacy, diet quality, and adherence to the MedDiet than those non-nut consumers.
40
Shahid, Mohammad, Mohammad Tarique Zeyad, Asad Syed, Udai B. Singh, Abdullah Mohamed, Ali H. Bahkali, Abdallah M. Elgorban und John Pichtel. „Stress-Tolerant Endophytic Isolate Priestia aryabhattai BPR-9 Modulates Physio-Biochemical Mechanisms in Wheat (Triticum aestivum L.) for Enhanced Salt Tolerance“. International Journal of Environmental Research and Public Health 19, Nr. 17 (01.09.2022): 10883. http://dx.doi.org/10.3390/ijerph191710883.
Der volle Inhalt der QuelleAnnotation:
In efforts to improve plant productivity and enhance defense mechanisms against biotic and abiotic stresses, endophytic bacteria have been used as an alternative to chemical fertilizers and pesticides. In the current study, 25 endophytic microbes recovered from plant organs of Triticum aestivum L. (wheat) were assessed for biotic (phyto-fungal pathogens) and abiotic (salinity, drought, and heavy metal) stress tolerance. Among the recovered isolates, BPR-9 tolerated maximum salinity (18% NaCl), drought (15% PEG-6000), and heavy metals (µg mL−1): Cd (1200), Cr (1000), Cu (1000), Pb (800), and Hg (30). Based on phenotypic and biochemical characteristics, as well as 16S rDNA gene sequencing, endophytic isolate BPR-9 was recognized as Priestia aryabhattai (accession no. OM743254.1). This isolate was revealed as a powerful multi-stress-tolerant crop growth promoter after extensive in-vitro testing for plant growth-promoting attributes, nutrient (phosphate, P; potassium, K; and zinc, Zn) solubilization efficiency, extracellular enzyme (protease, cellulase, amylase, lipase, and pectinase) synthesis, and potential for antagonistic activity against important fungal pathogens viz. Alternaria solani, Rhizoctonia solani, Fusarium oxysporum, and Ustilaginoidea virens. At elevated salt levels, increases were noted in indole-3-acetic acid; siderophores; P, K, and Zn-solubilization; ACC deaminase; and ammonia synthesized by Priestia aryabhattai. Additionally, under in-vitro plant bioassays, wheat seedlings inoculated with P. aryabhattai experienced superior growth compared to non-inoculated seedlings in high salinity (0–15% NaCl) environment. Under NaCl stress, germination rate, plant length, vigor indices, and leaf pigments of wheat seedlings significantly increased following P. aryabhattai inoculation. Furthermore, at 2%-NaCl, B. aryabhattai greatly and significantly (p ≤ 0.05) decreased relative leaf water content, membrane damage, and electrolyte leakage compared with the non-inoculated control. Catalase, superoxide dismutase, and peroxidase activity increased by 29, 32, and 21%, respectively, in wheat seedlings exposed to 2% NaCl and inoculated with the bacteria. The present findings demonstrate that endophytic P. aryabhattai strains might be used in the future as a multi-stress reducer and crop growth promoter in agronomically important crops including cereals.
41
Böhm, Constantin, Martin Werz und Stefan Weihe. „Practical Approach to Eliminate Solidification Cracks by Supplementing AlMg4.5Mn0.7 with AlSi10Mg Powder in Laser Powder Bed Fusion“. Materials 15, Nr. 2 (13.01.2022): 572. http://dx.doi.org/10.3390/ma15020572.
Der volle Inhalt der QuelleAnnotation:
The range of available aluminum alloy powders for laser powder bed fusion (LPBF) is restricted to mainly Al–Si based alloys. Currently aluminum alloy powders, designed for lightweight application, based on Al–Mg (5000 series), Al–Si–Mg (6000 series), or Al–Zn–Mg (7000 series), cannot be processed by LPBF without solidification cracks. This has an impact on the potential of LPBF for lightweight applications. In fusion welding, solidification cracks are eliminated by using filler materials. This study aims to transfer the known procedure to LPBF, by supplementing EN AW-5083 (AlMg4.5Mn0.7) with AlSi10Mg. EN AW-5083 and two modifications (+7 wt.% and +15 wt.% AlSi10Mg) were produced by LPBF and analyzed. It was found that, in EN AW-5083, the solidification cracks have a length ≥200 µm parallel to the building direction. Furthermore, the solidification cracks can already be eliminated by supplementing 7 wt.% AlSi10Mg. The microstructure analysis revealed that, by supplementing AlSi10Mg, the melt pool boundaries become visible, and the grain refines by 40% relative to the base alloy. Therefore, adding a low melting point phase and grain refinement are the mechanisms that eliminate solidification cracking. This study illustrates a practical approach to eliminate solidification cracks in LPBF.
42
Schumacher, Mauro Valdir, Márcio Viera und Rudi Witschoreck. „Produção de serapilheira e transferência de nutrientes em área de segunda rotação com floresta de Pinus taeda L. no município de Cambará do Sul, RS.“ Ciência Florestal 18, Nr. 4 (30.12.2008): 471. http://dx.doi.org/10.5902/19805098431.
Der volle Inhalt der QuelleAnnotation:
Objetivou-se avaliar a transferência de serapilheira e nutrientes das copas ao solo em área de segunda rotação com floresta de Pinus taeda L. num período de 3 anos (5o ao 7o ano de idade) no município de Cambará do Sul, RS. Para tanto, foram alocadas três parcelas de 48 m x 50 m, cada uma com cinco coletores de 1 m2. Todo material depositado foi coletado mensalmente entre abril de 2004 e março de 2007. Após cada coleta, o material foi identificado e levado para o laboratório de Ecologia Florestal da Universidade Federal de Santa Maria onde posteriormente foi seco em estufa, pesado, moído e analisado quimicamente quanto aos teores de macro e micronutrientes. A deposição média anual de serapilheira foi de 4.519,1 kg ha-1, mostrando-se variável no decorrer dos três anos de estudos. O aporte total de macronutrientes ao solo, em kg ha-1 ano-1, foi de: 28,7 de Ca; 27,3 de N; 4,8 de Mg; 4,6 de K; 2,4 de S e 1,8 de P e o aporte de micronutrientes, em g ha-1 ano-1, foi de: 6.689,7 de Mn; 1.092,9 de Fe; 142,8 de Zn; 60,0 de B e 16,7 de Cu.
43
KHANEGAHI, BATOOL AHMADI, und HASSAN SEDGHI. „INFLUENCE OF ROTATION RATE ON OPTICAL PROPERTIES OF ZnS THIN FILMS ANALYZED BY SPECTROSCOPIC ELLIPSOMETRY METHOD“. Surface Review and Letters 27, Nr. 01 (05.04.2019): 1950092. http://dx.doi.org/10.1142/s0218625x19500926.
Der volle Inhalt der QuelleAnnotation:
In the present work, zinc sulfide thin films were deposited on glass substrates by sol–gel process with different coating speeds 3600, 4800, 6000 and 7200[Formula: see text]rpm. Zinc acetate (Zn(CH3COO)[Formula: see text]H2O) and thiourea (CH4N2S) were used as precursors. Two-methoxyethanol and monoethanolamine were used as solvent and stabilizer, respectively. The optical properties of ZnS thin films such as refractive index, extinction coefficient, dielectric function and optical band gap energy of the films were obtained by spectroscopic ellipsometry (SE) analysis method in the wavelength range of 300–800[Formula: see text]nm. The incidence angle of the layers was kept at 70∘. The measured SE parameters [Formula: see text] and [Formula: see text] are fitted against the designed model by minimizing the mean square error (MSE). Considering the data obtained, it can be deduced that the optical properties of ZnS films are highly influenced by rotation rates. The extinction coefficients of the films were increased with increasing rotation rates of the films. From these results, it is found that the energy gap of the ZnS films increases with increasing rotation rates of the films in the range of 3.13–3.20[Formula: see text]eV.
44
Kaner, Gülşah, Meltem Soylu, Nimet Yüksel, Neriman Inanç, Dilek Ongan und Eda Başmısırlı. „Evaluation of Nutritional Status of Patients with Depression“. BioMed Research International 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/521481.
Der volle Inhalt der QuelleAnnotation:
Aims and Objectives. Our goal was to determine nutritional status, body composition, and biochemical parameters of patients diagnosed with depression based on DSM-IV-TR criteria.Methods. A total of 59 individuals, aged 18–60 years admitted to Mental Health Centre of Kayseri Education and Research Hospital, were included in the study. The participants were randomly assigned to two groups; depression group (n=29) and control group (n=30). Anthropometric measurements, some biochemical parameters, demographic data, and 24-hour dietary recall were evaluated.Results. 65.5% of depression and 60.0% of control group were female. Intake of vitamins A, thiamine, riboflavin, B6, folate, C, Na, K, Mg, Ca, P, Fe, Zn, and fibre (p<0.05) were lower in depression group. Median levels of body weight, waist circumference, hip circumference, waist-to-hip ratio (p<0.05) were significantly higher in depression group. Fasting blood glucose levels, serum vitamins B12, and folic acid (p<0.05) in depression group were lower than controls. Serum insulin and HOMA levels of two groups were similar.Conclusion. Some vitamin B consumption and serum vitamin B12 and folic acid levels were low while signs of abdominal obesity were high among patients with depression. Future research exploring nutritional status of individuals with depression is warranted.
45
Y. Rilda, F. Rivaldo, Admi, Refinel, Armaini, A. Agustien und H. Pardi. „MODIFICATION NANO-SIZE OF ZINC OXIDE (ZnO-NS) WITH POLYETHYLENE GLYCOL AND APPLICATION AS ANTIMICROBIAL“. RASAYAN Journal of Chemistry 16, Nr. 02 (2023): 714–20. http://dx.doi.org/10.31788/rjc.2023.1628232.
Der volle Inhalt der QuelleAnnotation:
Sol-gel is a simple method used to synthesize nano-size ZnO (ZnO-NS) in many applications. It acts as an antimicrobial agent for Escherichia coli and Aspergillus niger infections. The nano-size and patterned nanorods structure of ZnO enhances anti-microbial properties. This study used Polyethylene Glycol (PEG-6000) polymer compounds with variations in their 3, 5, and 10% compositions as templates for the formation of the nanorods. The morphology of the ZnO-NS produced determined the increase in anti-microbial activity. Furthermore, those generated from 5% PEG composition (ZnO/PEG-5) have the smallest size with the greatest anti-microbial activity on inhibition zones against E. coli and A. niger, each of 8.5-10.5 mm. There are morphological differences in each variable in the homogeneity distribution level of the spherical and rod dimension patterns of ZnO-NS. This is based on characterization with UV-VIS-DRS and Fourier-Transform infrared (FT-IR) for the analysis of Zn-O interactions at wave number 500-550 cm-1. Field Emission Scanning Electron Microscopy-Dispersive Scanning Electron Microscope (FE-SEM) and Energy dispersive X-ray spectroscopy (EDX) was used for dimensional pattern analysis, while X-ray diffraction (XRD) was applied for hexagonal wurtzite ZnO structures following the ICSD-65122 standard.
46
Carioni, Vivian M. O., John D. Brockman, Martha C. Morris, Ruth A. Ngwenyama, Lance A. Schell, Vickie L. Spate und Stacy Crane. „Instrumental neutron activation analysis, a technique for measurement of Se, Hg, Fe, Zn, K, Mn, Br, and the Hg:Se ratio in brain tissue samples with results from the Memory and Aging Project (MAP)“. Journal of Radioanalytical and Nuclear Chemistry 318, Nr. 1 (21.07.2018): 43–48. http://dx.doi.org/10.1007/s10967-018-6020-0.
Der volle Inhalt der Quelle
47
Tokar’, Eduard, Natalia Kuzmenkova, Alexandra Rozhkova, Andrey Egorin, Daria Shlyk, Keliang Shi, Xiaolin Hou und Stepan Kalmykov. „Migration Features and Regularities of Heavy Metals Transformation in Fresh and Marine Ecosystems (Peter the Great Bay and Lake Khanka)“. Water 15, Nr. 12 (17.06.2023): 2267. http://dx.doi.org/10.3390/w15122267.
Der volle Inhalt der QuelleAnnotation:
Peter the Great Bay and Lake Khanka are among the most important structural and industrial fishing parts of the Far East coastal ecosystem, which are used by a number of countries such as Russia, China, Korea, Japan, etc. At the same time, the active use of water resources, as well as industrial activities deployed on the coastal part of these reservoirs, are accompanied by a constant flow of pollutants into the water area. Among them, one can include heavy metals; their entry and migration are currently not fully controlled. There exists an important scientific and ecological task to study the features of heavy metal migration and transformation in natural objects. Bottom sediments act as a substrate for hydrobionts and, at the same time, serve as accumulators of pollutants, so that they can be used as the main component of the coastal-shelf ecosystem. The geochemical assessment of the behavior of heavy metals in the bottom sediments of Ussuri Bay and Amur Bay (Sea of Japan) and Lake Khanka (Xingkai) has been performed. Qualitative and quantitative elemental compositions of the bottom sediments have been established by means of the inductively coupled plasma-mass spectrometry (ICP-MS), atomic absorption spectrometry (AAS), and X-ray fluorescence analysis (XRF), whereas a correlation with the concentration of elements in seawater above sediments has been provided. The main phases of anthropogenic components as well as their relationship with an increased content of heavy metals have been established using X-ray diffraction analysis (XRD). Average values of the concentration of elements in the bottom sediments of Peter the Great Bay decrease in the following row: Fe > Cu > Cr > Zn ≥ Pb > Mn > Ni, and for Lake Khanka: Pb > Cu > Mn > Fe > Cr > Zn > Ni. Here, the excessive contents of Cr, Fe, Cu, Zn, and Pb in sea bottom sediments by 6, 32, 7, 3, and 4 times as compared with background values are the result of the formation of a large amount of carbonate and iron-oxide phases. At the same time, it was shown that, during the transition from the estuarine (coastal) area of river flow to the central (closer to the outlet to the ocean), the concentration of biogenic metals (Ni, Zn, Pb, Cu) generally decreased 2–4-fold along the profile, which was associated with the formation of their hydroxides and carbonates in the area of mixing of freshwater and seawater followed by that of complex compounds or absorption. A significant anthropogenic impact is observed in the lake sediments, which is demonstrated by the excess of Pb concentration by 6700 times, as compared with the Clarke number of the lithosphere. The non-uniform distribution of heavy metals along the core profile has been established, which is related to different contents of aluminosilicate and iron oxide phases in the form of hematite and magnetite. The sedimentation rate has been established by means of granulometric and radiometric analysis and equaled to 0.45 mm/year in Ussuri Bay, 1.6 mm/year in Amur Bay, and 0.43–0.50 mm/year in Lake Khanka. By calculating the distribution coefficients of heavy metals in the ‘water–deposits’ system, some features of migration and accumulation of individual elements have been established. To assess the potential pollution of the marine areas, the geoaccumulation index (Igeo) and the pollution factor (Kc) have been calculated. In comparison with the maximum permissible concentrations of the Russian Federation (MPC), the World Health Organization (WHO), the US Environmental Protection Agency (US EPA), and environmental protection agencies of China and Japan, Peter the Great Bay has an excess of Mn—2-fold, Fe—2-fold, Zn—3-fold, whereas in Lake Khanka, the situation is even less favorable, in particular, the excess of Mn is 79-fold, Fe—35-fold, Cu—2-fold, Zn—3–4-fold, which is clearly determined by the closeness of the water basin and the lack of water exchange. In comparison with the lithosphere Clarke number, the sediments of both water basins, as well as the coastal soil of the lake, are enriched with Pb and depleted with Cr, Ni, and Zn. The highest values of Igeo in both water basins have been observed for Pb, and equaled 12–16 in Peter the Great Bay and 6000 in Khanka Lake. Based on the data obtained, the areas with the greatest pollution caused by natural and anthropogenic factors have been identified.
48
Awad, Mubasher H., Aborawi M. Elgornazi und Nouri M. A. Soleiman. „Assessment of Physicochemical Properties and Mineral Compositions of Almond (Prunus amygdalus) Gum of Libyan Origin“. Journal of Advanced Chemical Sciences 7, Nr. 1 (07.02.2021): 702–5. http://dx.doi.org/10.30799/jacs.232.21070102.
Der volle Inhalt der QuelleAnnotation:
Twenty-five authentic samples of Prunus amygdalus gum samples were collected from five different locations in northwest of Libya. Different physicochemical methods were used to characterize this type of gum samples. The mean values of the moisture ranged from 12.55 to 14.93%, ash mean values 4.03 to 4.62%, pH 3.89 to 4.40, W.H.C 52.85 to 60.0%, and O.H.C 136.2 to 156.3%. Solubility of Prunus amygdalus gum showed that it had low solubility in distilled water with the mean values ranged from 20.01 to 35.40%, but it dissolved perfectly in alkali media where solubility increased to 96.3% in 0.05 M Na2CO3. The study exhibited that the mean values of cationic concentration in %(w/w) such as calcium was ranged from 0.552 to 0.585, potassium 0.402 to 0.505, iron 0.0975 to 0.1125, and sodium 0.064 to 0.079, which indicates that Ca has the highest concentration of metallic ions present. Atomic absorption method indicate that all samples contain traces of elements, Li, Cr, Mn, Ni, Zn, Pb, Hg, and Cd. The main functional groups recorded from FTIR spectrum included bands at 3293 cm-1 (O-H in carboxylic group), 1601.77 cm-1 (C=O, amide N-H bend, and C=C), 1357.53 cm-1 (CH3-, and C-O-H in- plane bending vibration), and 1025.74 cm-1 (C-O stretching).
49
Calo, Cristina Marilin, Márcia A. Rizzutto, Carlos A. Pérez, Rogério Machado, Cauê G. Ferreira, Natasha F. Aguero, Laura P. Furquim, Eduardo G. Neves und Francisco A. Pugliese. „Some Notes on Dense Structures Present in Archaeological Plant Remains: X-ray Fluorescence Computed Tomography Applications“. Minerals 12, Nr. 9 (06.09.2022): 1130. http://dx.doi.org/10.3390/min12091130.
Der volle Inhalt der QuelleAnnotation:
This study describes the composition and provenance of dense bodies or structures present in uncharred plant vestiges recovered at Monte Castelo (6000–700 cal. AP-SW Amazonia). It aimed to disclose some aspects of this plant remains’ interactions with the sedimentary matrix of the site over the 200 years (at least) since its initial deposit, from the point of view of the soft tissue mineralization processes. Two specimens were examined using XFCT, X-ray MicroCT, and SEM-EDS techniques to reveal the presence and distribution of Ca, K, Mn, Fe, Ti, Si, S, Cu, Br, Rb, Sr, Zn, and Zr. These attributes were integrated with compositional ED-XRF and XRD measured data from the sedimentary substrate. Results show that some of the chemical elements present in solid bodies and anatomical structures of the plant remains refer to the sedimentary environment, while others have an endogenous origin. These include mainly Rb and Br, which were interpreted as the result of degradation processes of the internal tissues, where they are mainly present. Except Sr and Zr, a portion of all the other elements entered and disperse into the sample structures from the sedimentary substrate. Its presence is attributable to mechanisms such as attachment, diffusion and impregnation through the outermost tissues, where they are mostly concentrated. The composition of most of the dense bodies consists of both endogenous and exogenous elements.
50
Kulshrestha, Rupita, Shefali Singh, Juhi Verma, Vibhav Nigam und Manish Raj Kulshrestha. „Uncovering ovarian reserve: Insights into hormones, lipids, and essential metals“. Indian Journal of Obstetrics and Gynecology Research 11, Nr. 2 (15.05.2024): 226–31. http://dx.doi.org/10.18231/j.ijogr.2024.045.
Der volle Inhalt der QuelleAnnotation:
: Polycystic Ovary Syndrome (PCOS) is an endocrine disorder prevalent in women of reproductive age group. The intricate nature of PCOS development is highlighted by fluctuations in various sex hormones, such as luteinizing hormone(LH), follicle-stimulating hormone and prolactin. This study aims to assess the lipid profile levels, vital metals and sex hormones in the serum of patients with PCOS and contrast these findings with normal controls.The study analyzed health metrics between 57 women with PCOS and 57 normal controls. The lipid profile was assessed using Beckman Coulter AU480. Sex hormones were estimated using Roche Diagnostics Cobas 6000. Inductively coupled plasma mass spectrometry (ICPMS) was used to measure the essential trace metals, including magnesium (Mg), copper (Cu) Selenium (Se) and zinc (Zn).: The PCOS patients exhibited significantly elevated levels of LH (9.52 vs 3.48, p<0.0001), FSH (9.91 vs. 6.12, p<0.0001) and prolactin (24.71 vs. 16.41, p=0.03) mIU/ml. The correlation study showed a significant positive correlation between AMH and Se levels (R=0.27, p=0.045) and between LH and HDL (R=0.76, p=0.030).: In patients with PCOS, LH, FSH, and prolactin levels were found to be increased. A correlation was observed between Se and AMH, and a relationship was noted between LH and HDL. Selenium appears to have a significant influence on the ovarian reserve.