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Academic literature on the topic 'Zinc'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 August 2024

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Journal articles on the topic "Zinc"

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Bhubhanil, Sakkarin, Panida Sittipo, Paweena Chaoprasid, Sumontha Nookabkaew, Rojana Sukchawalit, and Skorn Mongkolsuk. "Control of zinc homeostasis in Agrobacterium tumefaciens via zur and the zinc uptake genes znuABC and zinT." Microbiology 160, no. 11 (November 1, 2014): 2452–63. http://dx.doi.org/10.1099/mic.0.082446-0.

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The Agrobacterium tumefaciens zinc uptake regulator (Zur) was shown to negatively regulate the zinc uptake genes znuABC, encoding a zinc transport system belonging to the ATP-binding cassette (ABC) transporter family, and zinT, which encodes a periplasmic zinc-binding protein. The expression of znuABC and zinT was inducible when cells were grown in medium containing a metal chelator (EDTA), and this induction was shown to be specific for zinc depletion. The expression of znuABC was reduced in response to increased zinc in a dose-dependent manner, and zinT had a less pronounced but similar pattern of zinc-regulated expression. The inactivation of zur led to constitutively high expression of znuABC and zinT. In addition, a zur mutant had an increased total zinc content compared to the WT NTL4 strain, whereas the inactivation of zinT caused a reduction in the total zinc content. The zinT gene is shown to play a dominant role and to be more important than znuA and znuB for A. tumefaciens survival under zinc deprivation. ZinT can function even when ZnuABC is inactivated. However, mutations in zur, znuA, znuB or zinT did not affect the virulence of A. tumefaciens.

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Petrarca, Patrizia, Serena Ammendola, Paolo Pasquali, and Andrea Battistoni. "The Zur-Regulated ZinT Protein Is an Auxiliary Component of the High-Affinity ZnuABC Zinc Transporter That Facilitates Metal Recruitment during Severe Zinc Shortage." Journal of Bacteriology 192, no. 6 (January 22, 2010): 1553–64. http://dx.doi.org/10.1128/jb.01310-09.

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ABSTRACT The pathways ensuring the efficient uptake of zinc are crucial for the ability of bacteria to multiply in the infected host. To better understand bacterial responses to zinc deficiency, we have investigated the role of the periplasmic protein ZinT in Salmonella enterica serovar Typhimurium. We have found that zinT expression is regulated by Zur and parallels that of ZnuA, the periplasmic component of the zinc transporter ZnuABC. Despite the fact that ZinT contributes to Salmonella growth in media containing little zinc, disruption of zinT does not significantly affect virulence in mice. The role of ZinT became clear using strains expressing a mutated form of ZnuA lacking a characteristic histidine-rich domain. In fact, Salmonella strains producing this modified form of ZnuA exhibited a ZinT-dependent capability to import zinc either in vitro or in infected mice, suggesting that ZinT and the histidine-rich region of ZnuA have redundant function. The hypothesis that ZinT and ZnuA cooperate in the process of zinc recruitment is supported by the observation that they form a stable binary complex in vitro. Although the presence of ZinT is not strictly required to ensure the functionality of the ZnuABC transporter, our data suggest that ZinT facilitates metal acquisition during severe zinc shortage.

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Chaoprasid, Paweena, Thanittra Dokpikul, Jaruwan Johnrod, Sirin Sirirakphaisarn, Sumontha Nookabkaew, Rojana Sukchawalit, and Skorn Mongkolsuk. "Agrobacterium tumefaciens Zur Regulates the High-Affinity Zinc Uptake System TroCBA and the Putative Metal Chaperone YciC, along with ZinT and ZnuABC, for Survival under Zinc-Limiting Conditions." Applied and Environmental Microbiology 82, no. 12 (April 8, 2016): 3503–14. http://dx.doi.org/10.1128/aem.00299-16.

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ABSTRACTAgrobacterium tumefacienshas a cluster of genes (Atu3178, Atu3179, and Atu3180) encoding an ABC-type transporter, here namedtroA,troB, andtroC, respectively, which is shown here to be a zinc-specific uptake system. Reverse transcription (RT)-PCR analysis confirmed thattroA,troB, andtroCare cotranscribed, withtroCas the first gene of the operon. TheyciC(Atu3181) gene is transcribed in the opposite orientation to that of thetroCBAoperon and belongs to a metal-binding GTPase family. Expression oftroCBAandyciCwas inducible under zinc-limiting conditions and was controlled by the zinc uptake regulator, Zur. Compared to the wild type, the mutant strain lackingtroCwas hypersensitive to a metal chelator, EDTA, and the phenotype could be rescued by the addition of zinc, while the strain with a singleyciCmutation showed no phenotype. However,yciCwas important for survival under zinc limitation when eithertroCorzinTwas inactivated. The periplasmic zinc-binding protein, ZinT, could not function when TroC was inactivated, suggesting that ZinT may interact with TroCBA in zinc uptake. Unlike many other bacteria, the ABC-type transporter ZnuABC was not the major zinc uptake system inA. tumefaciens. However, the important role ofA. tumefaciensZnuABC was revealed when TroCBA was impaired. The strain containing double mutations in theznuAandtroCgenes exhibited a growth defect in minimal medium.A. tumefaciensrequires cooperation of zinc uptake systems and zinc chaperones, including TroCBA, ZnuABC, ZinT, and YciC, for survival under a wide range of zinc-limiting conditions.IMPORTANCEBoth host and pathogen battle over access to essential metals, including zinc. In low-zinc environments, physiological responses that make it possible to acquire enough zinc are important for bacterial survival and could determine the outcome of host-pathogen interactions.A. tumefacienswas found to operate a novel pathway for zinc uptake in which ZinT functions in concert with the high-affinity zinc importer TroCBA.

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Hamik, Welli, Dany Hilmanto, and Sri Endah Rahayuningsih. "Relationship between serum zinc and homocysteine in children with nephrotic syndrome." Paediatrica Indonesiana 59, no. 2 (April 15, 2019): 98–103. http://dx.doi.org/10.14238/pi59.2.2019.98-103.

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Background In children, most idiopathic nephrotic syndrome (NS) is a minimal lesion, which responds well to steroids. Hyperhomocysteinemia is pathologic and worsens NS by causing chronic inflammation, leading to glomerular sclerosis. Zinc metalloenzymes are involved in homocysteine metabolism. Objective To assess for a possible relationship between serum zinc and homocysteine in children with NS. Methods A cross-sectional study was conducted in children with NS aged 1-18 years, who were admitted to Hasan Sadikin Hospital from November 2017 - January 2018. Subjects were selected consecutively. Serum zinc and homocysteine were measured in all subjects. Statistical analysis was done with Pearson’s correlation test. If the distribution was not linear, the analysis was continued with non-linear regression. Results There were 23 children who met the inclusion criteria. Mean serum homocysteine and zinc levels were 10.37 (SD 4.11) µmol/L and 51.13 (SD 29.69) µg/dL, respectively. Pearson’s correlation analysis showed no linear correlation between them (r coefficient -0.173; P=0.430). However, after adjusting for age and serum albumin level, multiple regression analysis suggested a cubical relationship between serum homocysteine and zinc, using the equation: homocysteine = -4.572 + 0.735 x zinc - 0.0012 x zinc2 + 0.00005 x zinc3 x age (months) (R2 multiple=53.2%; P=0.012). This equation indicates that 53.2% of homocysteine variation was influenced by serum zinc concentration. Conclusion In childhood NS, homocysteine is not correlated linearly with zinc, but related with cubical model.

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Hartono, Harvey Alvin, Efendi Lukas, Nasrudin Andi Mappaware, Maisuri Tadjuddin Chalid, Andi Mardiah Tahir, and Isharyah Sunarno. "The Role of Zinc-Rich Food Consumption on Zinc Level and the Incident of Preeclampsia." Indonesian Journal of Obstetrics & Gynecology Science 6, no. 1 (March 24, 2023): 133–44. http://dx.doi.org/10.24198/obgynia.v6n1.474.

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Objective: Investigate the correlation between dietary intake of zinc, preeclampsia and blood zinc levels. Methods: This study, which compared pregnant women in the third trimester at the Wahidin Sudirohusodo Hospital and the educational network hospital with and without preeclampsia, used a Cross Sectional methodology. Zinc level testing was carried out at Prodia using ICP-MS method. Mann Whitney, Kruskal Wallis, and chi square tests were used to examine the data. Results: Preeclampsia group (n=38) and control group (n=40) were two groups made up of a total of 78 pregnant women. Zn level of severe preeclampsia (47.73 ± 11.23 ng/mL) was lower than preeclampsia (50.50 ± 13.59 ng/mL) and non-preeclampsia (50.58 ± 10.12ng/mL), but not significantly. Lower zinc rich-food consumption was a significant effect on zinc deficiency (p< 0.05), and was no significant effect on preeclampsia (p > 0.05). Conclusion: Low intake of zinc-rich foods and occasionally exposure to cigarette smoke are the causes of zinc insufficiency in third trimester pregnancy, but has little impact on the occurrence of preeclampsia. Peranan Konsumsi Makanan Kaya Zink terhadap Kadar Zink dan Insiden Preeklamsia Abstrak Tujuan: Mengetahui korelasi antara asupan zink, preeklamsia dan tingkat zink serum. Metode: Penelitian ini membandingkan ibu hamil trimester III di RS Wahidin Sudirohusodo dan RS jejaring pendidikan dengan dan tanpa preeklampsia menggunakan metodologi Cross Sectional. Pengujian kadar zink dilakukan di Prodia dengan menggunakan metode ICP-MS. Uji Mann Whitney, Kruskal Wallis dan Chi Square digunakan untuk menganalisis data. Hasil: Kelompok preeklamsia (n=38) dan kelompok kontrol (n=40) adalah dua kelompok yang terdiri dari total 78 ibu hamil. Kadar Zn preeklamsia berat (47.73 ± 11.23 ng/mL) lebih rendah dibandingkan preeklamsia (50.50 ± 13.59 ng/mL) dan non preeklamsia (50.58 ± 10.12ng/mL), tetapi tidak bermakna. Rendahnya konsumsi makanan kaya zink berpengaruh signifikan terhadap defisiensi zink (p<0.05), namun tidak signifikan terhadap kejadian preeklamsia (p>0.05). Kesimpulan: Diet rendah zink dan paparan asap rokok adalah penyebab defisiensi zink pada kehamilan trimester III, tetapi memiliki dampak kecil terhadap insiden preeklamsia. Kata kunci: preeklamsia, kehamilan, zink

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J.S, DASALKAR, RUDRAKSHA G.B, LAWAND B.T, and RACHEWAD S.N. "RESPONSE OF SORGHUM-WHEAT ROTATION TO DIFFERENT SOURCES OF ZINC IN VERTISOL." Madras Agricultural Journal 81, Augest (1994): 415–17. http://dx.doi.org/10.29321/maj.10.a01548.

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A field experiment was conducted to study the efficiency of different sources of zinc in sorghum-wheat crop rotation on calcareous vertisol of Parbhani. Zinc application 4kg Zn/ha through zincated superphosphate proved its superiority over other zine sources in producing grain and fodder yield of sorghum. Among the zine snurces, the residual effect of zincated superphosphate was significantly higher in producing grain and straw yield of wheat followed by farm yard manure and zinc sulphate. Zinc application @ 4kg Za/ha through different Zinc sources significantly increased uptake of Zn.N and P by wheat crop. Highest uptake of nutrients was recorded with zincated superphosphate in both the crop.

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., VASUDEVA, and ANANTHANARAYANA R. "Distribution of zine fractions in different taxonomical groups of base unsaturated soils in Karnataka." Madras Agricultural Journal 89, December (2002): 639–45. http://dx.doi.org/10.29321/maj.10.a00278.

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Distribution of different forms of zinc in seven profiles of base unsaturated soils of Karnataka and their relation to soil characters were studied. The results showed that more than 82.7 per cent of total zinc occurred as residual zinc, whereas exchangeable zine occurred only 1.1 per cent of total zine content. Soils contained exchangeable Zn from 0.04 to 2.3 µg g', organically bound Zn from 0.07 to 6.44 ug g', manganese oxide bound from 0.1 to 4.3 ug gl amorphous iron oxide bound Zn from 0.5 to 7.7 Hg g, crystalline iron oxide bound from 0.5 to 8.2 µg g', residual zinc from 9 to 109 ug g'. Although the exchangeable pool was very low in all the soils when compared to other fractions, still it is very important from the plant availability point of view. Amorphous iron oxide bound form of zinc is the seat for zinc adsorption because of its high specific surface area. Crystalline iron oxide bound form of zinc dominated when compared to exchangeable, organically bound, manganese oxide bound and amorphous iron oxide bound zinc fractions.

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Bilqis, Nabilah, Erni Sulistiawati, and Miftakh Nur Rahman. "Application of The Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) Method in Zinc Analysis." JURNAL SAINS NATURAL 12, no. 1 (January 27, 2022): 23. http://dx.doi.org/10.31938/jsn.v12i1.321.

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Zinc is a nutrient that affects cell growth, helps the body's metabolism, activates T cells (T lymphocytes), cell regeneration, and repairs body tissues. Zinc in the body undergoes a process of excretion every day, therefore daily intake of zinc needs to be considered to maintain the amount of zinc in the body in a normal amount. This study aimed to obtain information on the application of the Inductively coupled plasma-mass spectrometry (ICP-MS) method to determine the concentration of zinc in the serum of pregnant women. The application of Inductively coupled plasma-mass spectrometry (ICP-MS) method in zinc analysis provided the advantages of a minimal sample volume requirement with higher instrument sensitivity, fast retention time and had a concentration detection limit of up to parts per billion (ppb). Analysis of the zinc concentration in the serum of pregnant women using the ICP-MS method showed 80% serum with a concentration below the reference value, 13.3% normal and 6.7% a concentration higher than the WHO reference value.Keywords: defisiensi zink, inductively coupled plasma-mass spectrometry (icp-ms), zinkABSTRAKAplikasi Metode Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) Dalam Analisis ZinkZink adalah salah satu jenis zat gizi yang sangat berpengaruh terhadap pertumbuhan sel, mengaktifkan sel T (limfosit T), regenerasi sel, dan membantu metabolisme tubuh. Zink di dalam tubuh setiap harinya mengalami proses ekskresi oleh karena itu asupan harian zink perlu diperhatikan untuk menjaga jumlah zink di dalam tubuh tetap dalam jumlah yang normal. Penelitian ini bertujuan untuk mendapatkan informasi penggunaan metode Inductively coupled plasma-mass spectrometry (ICP-MS) untuk menentukan konsentrasi zink dalam serum ibu hamil. Penggunaan metode ICP-MS dalam analisis zink memberikan keuntungan berupa kebutuhan volume sampel minimal dengan sensitivitas alat lebih tinggi, waktu retensi yang cepat serta memiliki batas limit deteksi konsentrasi hingga bagian per triliun (ppt). Analisis konsentrasi zink dalam serum ibu hamil dengan metode ICP-MS menunjukan 80% serum dengan konsentrasi dibawah nilai rujukan, 13,3% normal dan 6,7% konsentrasi yang lebih tinggi dibandingkan nilai rujukan menurut WHO.Kata kunci : defisiensi zink, inductively coupled plasma-mass spectrometry (icp-ms), zink

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SEKARAN, SRI RAMACHANDRA, and MATHAN K.K. "DIRECT AND RESIDUAL EFFECT OF DIFFERENT ZINC SOURCES ON UPTAKE OF Zn AND YIELD IN PADDY-PULSE ROTATION." Madras Agricultural Journal 78, March Augest (1991): 197–99. http://dx.doi.org/10.29321/maj.10.a01844.

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Direct and residual effect of different zinc sources (Zinc sulphate, Zincated urea and Zincated suphala) in rice-pulse-rotation was evaluated. Crop yield, concentration and uptake of zine was high in plots where Zn was applied as zincated urea alone and in combination with zincated suphala. Residual effect on the pod yield of green gram was also found. Residual effect on the zinc uptake both by pod and haulms was not much influenced by zinc sources. None of the zine sources could provide DTPA Zn of 2 ppm (critical limit) after greengram crop in order to raise the third crop

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Eppenich, H. "Kent's Repertory—zinc versus zing." British Homoeopathic journal 79, no. 1 (January 1990): 68. http://dx.doi.org/10.1016/s0007-0785(05)80142-5.

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Dissertations / Theses on the topic "Zinc"

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Downes, Julie. "The electrodeposition of zinc and zinc cobalt alloys." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240591.

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Nydegger, Irma Kay Alan R. "Explorations of hippocampal zinc using zinc-selective fluorescent dyes." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/414.

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Lennox, Martin. "Synthesis of zinc / zinc oxide nanoparticle-carbon nanotube composites." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121192.

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This thesis presents a novel process for the synthesis of zinc/zinc oxide nanoparticle-carbon nanotube composites. The process combines aerosol flow condensation for the synthesis of nanoparticles with a radio-frequency glow discharge in order to facilitate the deposition of these nanoparticles on nanostructured surfaces consisting of carbon nanotubes grown directly on stainless steel substrates. The design, construction and optimization of the process is described. A maximum observed nanoparticle deposition rate of 500 nm/min was observed when layers of nanoparticles were deposited on silicon wafers. Significant variation in the nanoparticle deposition rate was also observed; 95% confidence intervals on the prediction of nanoparticle layer thicknesses were approximately ±225nm and ±550nm for the evaporative source temperature range of 575 to 625 °C and measured average evaporation rate range of 0.009 to 0.048 g/min, respectively. A core/shell structure of zinc/zinc oxide nanoparticles is inferred from electron diffraction, X-ray diffraction, and X-ray photoelectron spectroscopy data. The utility of the synthesized nanocomposites as cathode materials is evaluated in a model direct-current glow discharge system. No significant reduction in the voltages required to sustain the glow discharge were observed when the synthesized nanocomposites were tested, as compared to cathodes of nanostructured carbon nanotube surfaces or bare stainless steel cathodes.
Cette thèse présente un nouveau procédé de synthèse de nanotubes de carbone décorés de nanoparticules de zinc et oxyde de zinc. Le procédé combine la condensation d'un aérosol pour la synthèse de nanoparticules avec le traitement des particules en vol dans une décharge luminescente par radiofréquence. Cette méthode facilite le dépôt de nanoparticules sur ces surfaces nanostructurées telles que des nanotubes de carbone formés directement sur des substrats en acier inoxydable dans le cas présent. La conception, la construction et l'optimisation des processus sont décrits. Une vitesse de dépôt maximale de 500 nm/min a été observée lorsque les couches de nanoparticules ont été déposées sur des plaquettes de silicium. On a également observé une variation significative dans le taux de dépôt de nanoparticules; les intervalles de confiance à 95% pour le prédictions de l'épaisseur de la couche de nanoparticules étaient approximativement ±225 nm et ±550 nm pour la plage de température de la source d'évaporation de 575 à 625 °C tandis que le taux d'évaporation moyen mesuré variait de 0,009 à 0,048 g/min, respectivement. À partir des données de diffraction des électrons, de diffraction des rayons X ainsi que de spectroscopie photoélectronique aux rayons X, il a été possible de déduire que les nanoparticules ont une structure coeur-écorce composée de zinc et d'oxyde de zinc. L'utilité des nanocomposites synthétisés comme matériaux pour une cathode est évaluée dans un système de décharge luminescente en courant continu. Aucune réduction significative des tensions nécessaires au maintien de la décharge luminescente a été observée lorsque les nanocomposites synthétisés ont été testés, par rapport aux cathodes formées de surfaces nanostructurées de nanotube de carbone ou aux cathodes en acier inoxydable non-traité.

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Nydegger, Irma. "Explorations of hippocampal zinc using zinc-selective fluorescent dyes." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/414.

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Zn is a transition metal that fulfills many roles in mammalian cells, from structural support for many proteins, to second messenger and enzymatic cofactors. Specific neuronal terminals in the hippocampus contain higher Zn concentrations than other brain cells, but it is still unclear as to why Zn accumulates there. Since Zn is co-packaged with the neurotransmitter glutamate in synaptic vesicles, one possibility is that it gets released during neurotransmission. To study zinc uptake in the cytoplasm and the possibility of Zn release, we employed different fluorescent Zn indicators. These dyes passively cross the cell membrane and become fluorescent upon zinc binding. We found that the extracellular concentration of zinc and therefore zinc influx into the cell is limited by the presence of phosphate, which induces zinc precipitation by forming insoluble zinc-phosphate salts. Zinc solubility and influx is increased by the application of histidine to the extracellular medium. We also found that exogenously applied zinc in the presence of a zinc ionophore seems to translocate in vesicles and cytoplasmic compartments. Zinc seems to be very tightly buffered as it enters the cytoplasm, since transient increases in fluorescence (as observed during Ca2+ influx into the cytoplasm) are not observed. Our data also seems to indicate that zinc is not being freely released in the extracellular space, but is being externalized instead.

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Kyriacou, Jane. "The biochemistry and genetics of zinc tolerance and zinc accumulation in the zinc hyperaccumulator Arabidopsis halleri." Thesis, University of Exeter, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272999.

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Alsufiani, Hadeil Muhanna A. "Zinc intake, zinc status and expression of zinc transporter genes in younger and older Saudi adults." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3451.

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Background: During ageing, there are changes in many physiological systems including the gastrointestinal tract which may result in decreased absorption of micronutrients such as zinc. Decreased dietary absorption efficiency and/or inadequate zinc intake are contributing factors to the decline in plasma zinc concentration that has been reported in older adults. This decline in plasma zinc concentration may have important implications for health, e.g. through reduced immune function. To date, there is limited information on the relationships between zinc intake and plasma zinc concentration during ageing among adults in Saudi Arabia or on the molecular mechanisms responsible for age-related effects. Thus, the aims of this study were to test the hypothesis that changes in expression of zinc transporters including ZnT1, ZnT5 and ZIP4 are associated with changes in zinc status in young and older Saudi adults. Methods: Two hundred and two young and older Saudi adults of both sexes were recruited from Jeddah city in the western region of Saudi Arabia. Intakes of zinc and of zinc absorption modifiers in diet were assessed using an FFQ (designed and validated for this purpose) while plasma zinc concentration was determined by ICP-OES. RNA was extracted from white blood cells and qPCR was used to quantitatively measure expression of the ZnT1, ZnT5 and ZIP4 genes at the mRNA level. Results: Intakes of zinc and of protein were significantly higher in males than in females (P < 0.05). A substantial proportion of the participants appeared to have inadequate zinc intake with the risk of inadequacy being greatest for young males (15%) and young females (4%). Plasma zinc concentrations in older adults were significantly higher than in young adults (P < 0.05). Older males had significantly higher ZIP4 expression compared with young adults (P < 0.05). Although older adults had apparently higher ZnT1 and ZnT5 expression than young adults, these differences were statistically non-significant. Several age and sex-specific correlations between zinc intake, zinc status and expression of zinc transporters were observed. Young and older adults who had apple-shaped fat distribution pattern, had significantly higher expression of ZnT1, ZnT5 and ZIP4 and plasma zinc status compared with participants who had pear-shaped fat distribution pattern (P<0.05). Discussion: Despite the changes in food availability in Saudi Arabia over recent decades, the prevalence of low zinc intake remains substantial. Contrary to reports from elsewhere, the prevalence of low plasma II zinc concentrations was greater in younger than in older Saudi adults. This study also identified relationships between expression of zinc transporters and zinc intake, zinc status and abdominal fatness in Saudi adults.

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Bosshard, Gabriela Zanotto 1986. "Propriedades ópticas e estruturais de óxido de zinco contendo enxofre." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250265.

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Orientador: Fernando Aparecido Sigoli
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-22T05:08:39Z (GMT). No. of bitstreams: 1 Bosshard_GabrielaZanotto_M.pdf: 4132378 bytes, checksum: abfa0f7115fb10b1aa31e7b1e9367ef8 (MD5) Previous issue date: 2012
Resumo: O objetivo deste projeto foi investigar a síntese de óxido de zinco contendo enxofre obtido a partir de sulfeto de zinco nas fases wurtzita (hexagonal) e blenda de zinco (cúbica), assim como fazer a caracterização e estudar as alterações estruturais e ópticas dos materiais sintetizados e compará-las às propriedades do óxido de zinco sintetizado a partir de hidroxicarbonato de zinco. O método de síntese utilizado permite a obtenção de sulfeto de zinco hexagonal ou cúbico a baixa temperatura, permitindo um estudo comparativo da influência da estrutura cristalina do sulfeto de zinco na formação do óxido de zinco. Os estudos por difração de raios X mostram que há leve variação nos parâmetros de rede do material obtido, principalmente quando a síntese parte da fase hexagonal do ZnS. Somado a isso, a análise da luminescência dos materiais obtidos mostra emissão em torno de 520 nm, que pode ser atribuída a transição eletrônica entre defeitos de Frenkel (Zni e VZn") que foram formados a temperaturas inferiores à requerida para a formação deste tipo de defeito, indicando, portanto alterações na rede do óxido de zinco contendo enxofre.
Abstract: This project aimed to investigate the synthesis of sulfur-containing zinc oxide obtained from zinc sulfide in the wurtzite (hexagonal) or zinc blende (cubic) phases, in order to study possible changes in the structural and optical properties of the obtained, material which were compared to the properties of zinc oxide synthesized from zinc hydroxicarbonate. The used method of synthesis allowed obtaining zinc sulfide hexagonal or cubic at low temperature and therefore comparative studies of the influence of crystalline structure of zinc sulfide in the formation of zinc oxide was possible. X-ray diffraction data show that there is a slight variation in the lattice parameters of the obtained material, especially in the material synthesized from hexagonal ZnS. In addition to that, luminescence emission around 520 nm, assigned to the electronic transition among Frenkel defects (Zni and VZn"), indicate changes in the network of the sulfur-containing zinc oxide, since this type of defect is expected to be formed at temperatures above the ones used in the present work.
Mestrado
Quimica Inorganica
Mestra em Química

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Castro, Luis Fernando D'Albuquerque e. "Avaliação do zinco plasmático nos pacientes idosos no Hospital Regional de Araguaina, Tocantins." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-04082011-093136/.

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Zinco é um importante micronutriente, participa de várias enzimas e tem papel fundamental na atividade imunológica. Com o objetivo de avaliar a deficiência de zinco nos idosos foi dosado o zinco plasmático em 88 pacientes com mais de 65 anos admitidos na Emergência do Hospital Regional de Araguaina, TO. Foram analisados: raça, gênero, medidas antropométricas, dosagem da hemoglobina, albumina, contagem de linfócitos, dosagem da proteína C reativa e tempo de permanência. Os resultados sugerem que ocorre deficiência de zinco mais acentuada no sexo feminino e que pacientes com deficiência de zinco também apresentam menores valores de índice de massa corpórea (IMC), hemoglobina, albumina e contagem de linfócitos. Não se observou maior incidência de infecção no grupo com deficiência de zinco, porém o grupo apresentou maior tempo de permanência hospitalar.
Zinc is an important micronutrient that plays a role in many enzymatic and immune system activities in human body. Considering this, the goal of this work is to evaluate zinc deficiency in elderly patients. A total of 88 volunteers with more than 65 years old, admitted at ER from Regional Hospital, were monitored and zinc concentration was dosed in their plasma. The sampling volunteers were evaluated according to: race, gender, anthropometric measurements, hemoglobin, albumin, total lymphocyte count, C-reactive protein dosage and length of stay. The results suggest that zinc deficiency is more pronounced in females and patients with zinc deficiency also show lower values of body mass index (BMI), hemoglobin, albumin and lymphocyte count. There was no increased incidence of infection in the group with zinc deficiency, but the group had a longer hospital stay.

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9

Muley, Amol. "Synthesis and characterization of nanostructured metallic zinc and zinc oxide." Thesis, Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39101538.

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Gentile, Marialuisa. "Influence of zinc on surface treatments of aluminium-zinc alloys." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/influence-of-zinc-on-surface-treatments-of-aluminiumzinc-alloys(5b467a34-ba91-422b-87e0-83ef8d700154).html.

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This research work studies the influence of zinc on surface treatments such as mechanical polishing, anodic alkaline etching, alkaline etching and electropolishing. Solid-solution binary alloys containing 0.6, 1.0 and 1.9at.%Zn were investigated using scanning and transmission electron microscopies and ion beam analysis. Initially, the near-surface composition of the surface pretreated aluminium alloys were determined using Rutherford backscattering spectroscopy (RBS), medium energy ion scattering (MEIS) and glow discharge optical spectroscopy (GDOES). Subsequently, the surface morphologies of the pretreated specimens were characterized by secondary electron microscopy (SEM) and atomic force microscopy (AFM). Further related work was undertaken on the effect of the employed surface treatments on the anodic behaviour of aluminium-zinc alloys. A final analysis was carried out on the influence of grain orientation on zinc enrichment and surface morphologies of aluminium-zinc alloys developed during alkaline etching.The results reveal that surface pretreatments of aluminium-zinc alloys lead to zinc enrichment at the alloy/film interface. The number of zinc atoms contained in the enriched layer depends upon the employed surface pretreatment and the alloy composition. Surface pretreatments influence the topography of Al-Zn alloys. In particular, for electropolishing, alkaline etching and anodic alkaline etching, the resultant surface morphologies were associated with the oxidation-dissolution-precipitation mechanisms occurring at the alloy/film interface and at the film/solution interface. Anodizing of Al-Zn alloys shows that the anodic films growth on Al-Zn alloys in rolled condition and after surface treatment becomes detached from the substrate independently of the surface treatment employed, although detachment of the anodic film occur earlier on surface pre-treated Al-Zn alloys that developed zinc enrichment. The final studies correlated the mechanisms of oxidation and dissolution with the grain orientation. The result revealed that the (111) grain dissolves faster than other grains, while the higher number of zinc enriched atoms were measured on the (001) grain.

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Books on the topic "Zinc"

1

Gray, Leon. Zinc. New York: Marshall Cavendish Benchmark, 2006.

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United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Zinc. Atlanta, GA: Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, 2005.

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Lew, Kristi. Zinc. New York: Rosen Central, 2008.

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Sukumar, Ethirajan, Krishnamurthy Vinothkumar, and Annamalai Manickavasagan. Zinc. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472.

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United States. Environmental Protection Agency. Emission Standards and Engineering Division, ed. Zinc/zinc oxide preliminary source assessment. Research Triangle Park, NC: U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Air Quality Planning and Standards, 1987.

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Fukada, Toshiyuki, and Taiho Kambe, eds. Zinc Signaling. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0557-7.

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Enthaler, Stephan, and Xiao-Feng Wu, eds. Zinc Catalysis. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527675944.

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Klingshirn, Claus F., Bruno K. Meyer, Andreas Waag, Axel Hoffmann, and Jean Geurts. Zinc Oxide. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10577-7.

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Canada. Environmental Protection Programs Directorate. Technical Services Branch., ed. Zinc sulphate. Ottawa: Environmental Protection Service, 1985.

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1935-, Spiro Thomas G., ed. Zinc enzymes. Malabar, Fla: R.E. Krieger Pub. Co., 1991.

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Book chapters on the topic "Zinc"

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Srinivasan, D., Krishnamurthy Vinoth Kumar, B. Shyamaladevi, and Ethirajan Sukumar. "Zinc." In Zinc, 61–67. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-6.

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Sukumar, Ethirajan, and Dasarathan Dharani. "Zinc in Indian Traditional Medicines." In Zinc, 114–24. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-11.

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John, K. Susan. "Soil-Plant Nutrition with Zinc in Tropical Tuber Crops." In Zinc, 195–208. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-17.

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Ramanathan, V., and Gautam R. Desiraju. "Zinc Metallurgical Heritage in India." In Zinc, 14–27. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-2.

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Deivasigamani, B., and A. Queen Elizabeth. "Zinc Enhances Immunity in Marine Finfishes." In Zinc, 232–39. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-20.

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Kumar, Krishnamurthy Vinoth, B. Shyamaladevi, and Ethirajan Sukumar. "Pharmacodynamics, Pharmacokinetics and Toxic Effects of Zinc." In Zinc, 28–38. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-3.

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Tudu, Gouri, Suvra Sil, and Venkataramanan Mahalingam. "Luminescent Nanoscale Materials for the Selective and Sensitive Detection of Zinc Ions." In Zinc, 265–78. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-23.

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Kalita, Deep J., and Chintha Pradeepika. "Zinc-Containing Vegetables, Fruits and Other Food Products." In Zinc, 39–48. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-4.

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Sim, Tao Ming, and Dinesh Kumar Srinivasan. "Zinc-Based Therapeutic Approach for Diabetes Mellitus." In Zinc, 100–113. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-10.

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Mukherjee, Rahul, Jitendra Kumar Pattanaik, and P. Purushothaman. "Understanding Zinc." In Zinc, 1–13. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-1.

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Conference papers on the topic "Zinc"

1

West, J. T., and F. F. Bonacker. "Characterization of all zinc chloride zinc carbon cells containing zinc cans made from no lead added zinc alloys." In IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203). IEEE, 1997. http://dx.doi.org/10.1109/iecec.1997.661882.

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Weir, M. S., J. M. Bednar, J. C. Watson, M. M. Beckman, J. R. Hale, and J. P. Stearns. "Zinc Flowlines." In Offshore Technology Conference. Offshore Technology Conference, 1993. http://dx.doi.org/10.4043/7286-ms.

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Budreyko, Ekaterina. "Zinc electroplating." In 2021 International Conference Engineering Technologies and Computer Science (EnT). IEEE, 2021. http://dx.doi.org/10.1109/ent52731.2021.00028.

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Goiz, O., F. Chavez, C. Felipe, R. Baca-Arroyo, N. Morales, and R. Pena-Sierra. "Zinc oxide microspheres grown on Zinc pellet substrate." In 2009 6th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE 2009). IEEE, 2009. http://dx.doi.org/10.1109/iceee.2009.5393393.

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Chamran, Fardad, Hong-Seok Min, Bruce Dunn, and Chang-Jin "CJ" Kim. "Zinc-air microbattery with electrode array of zinc microposts." In 2007 IEEE 20th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2007. http://dx.doi.org/10.1109/memsys.2007.4433097.

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Sanders, Brian W., and Adrian H. Kitai. "Atomic layer growth of zinc oxide and zinc sulphide." In Rochester, CAN-AM, edited by Ronald L. Antos and Allen J. Krisiloff. SPIE, 1991. http://dx.doi.org/10.1117/12.47783.

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Guillot, E., M. Epstein, C. Wieckert, G. Olalde, A. Steinfeld, S. Sante´n, U. Frommherz, S. Kra¨upl, and T. Osinga. "Solar Carbothermic Production of Zinc From Zinc Oxide: Solzinc." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76015.

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In late 2004, the pilot Solzinc solar reactor was commissioned. The European Union and the Swiss Federal Office of Science and Education are funding this project to demonstrate the technical feasibility and the economical potential of producing Zn by reducing zinc oxide with the aid of concentrated solar energy and a small amount of carbon at a close to industrial scale. The zinc can be used as a means to store solar energy in a chemical way, e.g. suited to release electricity in Zinc-air fuel cells. This allows on demand use, boosting the availability of solar energy. Furthermore, as the Zinc-air fuel cells’ waste is ZnO, we get a cyclic process by reducing this ZnO in the Solzinc solar reactor. Numerous lab tests and numerical studies of the chemical and thermal behavior of the solar carbothermic ZnO reduction process were conducted by the Swiss Paul Scherrer Institute, the Swiss Federal Institute of Technology, the Israeli Weizmann Institute and the French CNRS Processes, Materials and Solar Energy laboratory. An indirectly heated beam-down reactor concept was chosen and influencing parameters, such as the type of carbon, the stoichiometry of the ZnO-C mix and the process temperature were explored. Based on these findings the technology was scaled up for the pilot plant for about 0.25 MW solar input leading to a designed zinc production rate of 50kg/h. The Swedish company ScanArc Plasma Systems AB developed a special quench system to produce zinc dust directly from the gaseous zinc exhausted from the solar reactor. The dust’s characteristics were adapted to the requirements of the Zn-air fuel cells developed by the German company ZOXY Energy System AG. The resulting zinc can be easily stored and transported for generating electricity as needed. In 2004, the pilot reactor, the quench system and extensive instrumentation were installed at the Weizmann Institute’s solar facilities to process batches of up to 500 kg of ZnO-C mixture. After cold testing of the installation and fulfilling all safety requirements, the first batches were processed. This paper explores the results of the commissioning to show the technical feasibility of this process to produce zinc and to store solar energy.

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Yamaguchi, Harunaka, Takashi Nagira, Zempei Kawazu, Kenichi Ono, and Masayoshi Takemi. "Dependence of the diffusion of zinc from zinc-into ruthenium-doped indium phosphide on zinc concentration." In 2014 26th International Conference on Indium Phosphide and Related Materials (IPRM). IEEE, 2014. http://dx.doi.org/10.1109/iciprm.2014.6880532.

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Prenger, Frank, and Jochen Spriestersbach. "Thermal Spraying of Zinc and Zinc-Aluminium Alloys for Corrosion Protection." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0104.

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Abstract Thermally sprayed coatings of zinc, and in particular zinc-aluminium alloys, offer maximum corrosion protection for steel structures and reinforcing steel in concrete. They are primarily produced by arc or flame spraying. The surfaces of zinc and zinc alloy spray coatings can be protected by sealing top coats. This produces an optimum combination of passive and active corrosion protection and allows a service life of over 20 years. The development of new materials assumes intensive investigations. This paper provides an overview of the properties of thermally sprayed zinc and zinc-aluminium alloys as well as their microstructure and investigates the corrosion protection effect in tests and near-practical conditions.

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Gagné, Martin. "Complementary Zinc Coatings." In IABSE Symposium, Nantes 2018: Tomorrow’s Megastructures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/nantes.2018.s29-1.

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Reports on the topic "Zinc"

1

Van Rythoven, Adrian. Critical mineral: Zinc. Montana Bureau of Mines and Geology, December 2023. http://dx.doi.org/10.59691/dzmk9944.

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Frank E. Goodwin. Creep Resistant Zinc Alloy. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/809087.

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Dawson, K. M. Skarn zinc-lead-silver. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208016.

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Cooper, J., and R. Krueger. The Refuelable Zinc-air Battery: Alternative Techniques for Zinc and Electrolyte Regeneration. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/898511.

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Chu, T. Thin film cadmium telluride, zinc telluride, and mercury zinc telluride solar cells. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5657996.

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Sangster, D. F. Mississippi valley-type lead-zinc. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/207988.

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Dawson, K. M. Skarns à zinc-plomb-argent. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208017.

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Langton, C. A. Aqueous Zinc Bromide Waste Solidification. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/799460.

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Gangwal, S., S. Harkins, J. Stogner, and M. Woods. Multicycle testing of zinc ferrite. Office of Scientific and Technical Information (OSTI), October 1988. http://dx.doi.org/10.2172/6241967.

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Pepi, Marc, and Russell Kilbane. Testing and Evaluation of Zinc-Iron and Zinc-Nickel-Tin Coatings on Test Panels. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada396055.

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