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Articles de revues sur le sujet « Chemical propertie »

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Auteur : Grafiati
Publié le 14 mars 2023

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1

Mengistu, SL, et AE Shimelis. « Evaluation of the physico-chemical propertie (BH-660) for dextrose production ». African Journal of Food, Agriculture, Nutrition and Development 12, no 53 (3 août 2012) : 6503–16. http://dx.doi.org/10.18697/ajfand.53.10640.

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Dextrose was produced from locally available hybrid variety of maize (Bako Hybrid660) in Ethiopia, using acid extraction. The variety was selected as an experimental input from Bako Agricultural Research Centre for the production of intermediate product starch using wet milling and end-product dextrose. The proximate composition values in the wet, milled, dried and cleaned white dent 2000 g BH-660 maize when steeped in 0.3% sulfur dioxide for 46 hrs at 50oC were determined. The mean values were 11.74%, 64.15%, 4.51%, 10.23%, 6.53% and 2.81%, for moisture content, total starch, germ, gluten, husk and fibre, respectively on dry weight basis. The total starch obtained from wet milling was 91.8% pure starch by mass. The proximate analysis values of moisture, crude protein, crude fat, crude fibre and total ash content of the sample were 7.65 %, 4.89%, 0.35%, 0.75 % 0.29 % , respectively on dry weight basis. Besides these, pH value was also determined to be 4.79. This obtained starch was hydrolyzed by an acid extraction method for the production of BH-660 maize dextrose. An average yield of 91.64% dextrose result was obtained and from this, 92.24% was pure dextrose by mass. Analysis result revealed that moisture, crude protein, crude fat, crude fibre and total ash content of the produced dextrose were 6.24%, 0.11%, 0.25%, 0.30% and 0.03%, respectively on dry weight basis. In addition, the pH value of 6.28 was determined. The control dextrose obtained from Ethiopian Pharmaceutical Manufacturing Share Company analysis values of moisture, crude fibre, crude fat and dextrose content were 5%, 0.24%, 0.23% and 93.73%, respectively on dry weight basis. From these data, it can be concluded that the BH660 maize variety has a significant potential for the production of high quality starch and dextrose, which can be used as a raw material for starch and dextrose processing industries.
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Satbaev, B. N., A. Kh Nurumgaliev, Yu I. Shishkin, E. O. Aimbetova, N. T. Shalabaev et A. B. Satbaev. « High temperature and wear resistant materials with enhanced performance propertie ». NOVYE OGNEUPORY (NEW REFRACTORIES), no 2 (14 septembre 2020) : 30–34. http://dx.doi.org/10.17073/1683-4518-2020-2-30-34.

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The results of studies of obtaining self-sintering refractory masses are presented. A new technology for their manufacture is proposed. The basis of the resulting masses are baritecontaining components (barite or viterite concentrates). High chemical resistance, refractoriness, mechanical strength, hardness and wear resistance determine the scope of their application ― the manufacture of refractory products, linings, putties and concrete.
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Li, Xiao Li, Xiao Peng Li et Yu Li. « Correlate the Toxicity of PAHs with Physical and Chemical Propertie QSAR Descriptors by PCR Method ». Advanced Materials Research 599 (novembre 2012) : 151–54. http://dx.doi.org/10.4028/www.scientific.net/amr.599.151.

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The Quantitative Structure Activity Relationship (QSAR) was used to correlate eleven physical and chemical properties (GTCi, Vc, BP, MP, Hf, Tc, Pc, MW, MV, logKOWand logKOC) with toxicity of polycyclic aromatic hydrocarbons (PAHs). A multi-parameter regression model was conducted to simulate the toxicity of PAHs after minimization of the multicollinearity among the ion characteristics using principal component regression (PCR). The toxicity of PAHs increased with the positively correlated variables including GTCi, Vc, BP, MW, MV, logKOWand logKOC. The regression model provided the high simulate ability, with Nash-Suttcliffe simulation efficiency coefficients (NSC) of 0.89 for the modeling. The model may be successfully employed to predict the toxicity of PAHs and be used for further analysis.
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Lazic, Anita, Zeljko Mandic, Natasa Valentic, Gordana Uscumlic et Nemanja Trisovic. « New spirohydantoins derived from β-tetralone : Design, synthesis and evaluation of their pharmacokinetically relevant propertie ». Chemical Industry 73, no 2 (2019) : 79–92. http://dx.doi.org/10.2298/hemind181203007l.

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To create new anticonvulsant drugs, two series of spirohydantoins derived from ?-tetralone bearing a 4-substituted benzyl group (1a?1g) or a 2-(4-substituted phenyl)-2-oxoethyl group (2a?2f) in position 3 of the hydantoin ring were synthesized. The chemical structure of these compounds was confirmed by determination of the melting point, elemental analysis and FT-IR, 1H NMR, 13C NMR and UV-Vis spectroscopic methods. Effects of the substituents in the benzyl moiety on the shift of the absorption maxima of compounds 1a?1g and 2a?2f were analyzed using the Hammett's equation. Namely, a split in the Hammett plot at the parent compounds 1a and 2a revealed different electronic transitions within the molecules with the electron-donating substituents from those bearing the electron-accepting substituents, thus the electron-accepting effect on the shift of the absorption maxima being considerably stronger. The influence of the chemical structure on the pharmacokinetically relevant properties of the investigated hydantoin derivatives was evaluated using the Lipinski?s rule of five, Veber, Egan and Ghose's empirical criteria, as well as different in silico methods. When compared to phenytoin (5,5-diphenylhydantoin) as the referent drug, compounds with a halogen or electron-donating substituent are expected to possess better intestinal absorption and passage through the blood-brain barrier. Depending on the nature of the substituent present in the benzyl moiety, compounds 1a?1g and 2a?2f can be potent activators/inhibitors of some cytochrome P450 izoenzymes including CYP1A2, CYP2C19 and CYP2C9. Regarding biological activity profile, compounds with the electron-accepting substituents are likely to reveal the pharmacological potential similar to that of phenytoin, while those bearing electron-donating substituents are predicted to have the antimigrenic activity. All compounds were found to bear a low risk of being mutagenic or tumorigenic. The calculated molecular descriptors indicate that the investigated compounds fulfill necessary empirical criteria which qualify them as interesting drug candidates.
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Bosha, Abraham, Abitew Lagibo Dalbato, Tamado Tana, Wassu Mohammed, Buzayew Tesfaye et Laila M. Karlsson. « Nutritional and chemical propertie s of fermented food of wild and cultivated genotypes of enset ( Ensete ventricosum ) ». Food Research International 89 (novembre 2016) : 806–11. http://dx.doi.org/10.1016/j.foodres.2016.10.016.

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Hossain, M. Z., P. von Fragstein, P. von Niemsdorff et J. Heß. « Effect of Different Organic Wastes on Soil Propertie s and Plant Growth and Yield : a Review ». Scientia Agriculturae Bohemica 48, no 4 (20 décembre 2017) : 224–37. http://dx.doi.org/10.1515/sab-2017-0030.

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Abstract The use of organic wastes in agriculture plays a great role in recycling essential plant nutrients, sustaining soil security as well as protecting the environment from unwanted hazards. This review article deals with the effect of different kinds of organic wastes on soil properties and plant growth and yield. Municipal solid waste is mainly used as a source of nitrogen and organic matter, improving soil properties and microbial activity that are closely related to soil fertility. Biowaste and food waste increase pH, nitrogen content, cation exchange capacity, water holding capacity, and microbial biomass in soil. Sewage sludge contains various amounts of organic matter and huge amounts of plant nutrients. Manure is a common waste which improves soil properties by adding nutrients and increases microbial and enzyme activity in soil. It also reduces toxicity of some heavy metals. These organic wastes have a great positive impact on soil physical, chemical, and biological properties as well as stimulate plant growth and thus increase the yield of crops.
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7

SLONECKI, JERZY. « The effect of chain length and content of flexible oligo(oxyethylene) segments on some properties of copoly(ester-ether)s. Part II. Mechanical propertie ». Polimery 41, no 01 (janvier 1996) : 31–39. http://dx.doi.org/10.14314/polimery.1996.031.

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8

Onuorah, E. O., J. T. Nwabanne et E. L. C. Nnabuife. « Pulp and paper making potentials of elaeis guineensis (oil palm) grown in south east, Nigeria ». World Journal of Engineering 12, no 1 (1 février 2015) : 1–12. http://dx.doi.org/10.1260/1708-5284.12.1.1.

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The objective of this study was to determine the pulping and paper making potentials of oil palm (E guineensis). Fibrous material from the whole trunk (WT), empty fruit bunch (EFB, fronds (FDS) and depithed trunk (DT) were evaluated using proximate chemical analysis, fiber morphological and related characteristics. Effect of active alkali (AA) % as Na2O on kraft pulping properties and the handsheet paper propertie was studied. Proximate chemical analysis reveal acceptable cellulose content for EFB (43.51%), FDS (51.13%) and DT (53.80%) while WT (32.44) is unacceptable. Low lignin content obtained (17.8−21.8%) suggests easier pulping characteristics. The high % NaOH solubility of WT (26.05%) and FDS (32.1%) suggest potential of high effluent loads. Fiber morphological studies revealed that approximately 83% of fibers are ≤ 1.5 mm in length thus putting oil palm as a short fiber source. The slenderness ratio ranges from 33.44 to 82.80; Runkelratio from 0.40 to 0.63; flexibility co-efficient from 57.20 to 71.46 and rigidity co-efficient from 0.29 to 0.43. Studies of pulping properties reveal that as active alkali % was increased the percentage total pulp yield, % screened pulp yield, % screened rejects, pulp kappa number, klason lignin and tear index of resultant pulp/handsheet all/each decreased. Conversely, as active alkali % was increased the Brust index, double fold number, breaking length, tensile index of paper handsheets and pulp brightness were each enhanced. It was concluded that in pulping of WT AA% should be < 14 and EFB pulping should be ≤ 14 in order to have acceptable yield. Also in order to have acceptable tear index, AA% should be ≤ 16. It is being recommended that trunks should be depithed in order to have acceptable yield. The fibrous material from oil palm make acceptable raw material for paper making and are good hardwood substitutes. Paper produced when bleached can be used for printing and writing papers while the unbleached grades can be used for wrapping and package papers and for corrugated boards.
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J.O, Alagbe, Adedeji M.O, Habiba Z, Nwosu Gloria et Dabara Comfort Wyedia. « Physico-Chemical Properties of Indigofera Zollingeriana Seed Oil ». Biomedical Research and Clinical Reviews 6, no 2 (24 janvier 2022) : 01–03. http://dx.doi.org/10.31579/2692-9406/099.

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The objective of the present study is to examine the physico-chemical properties of Indigofera zollingeriana seed oil. Physico-chemical parameters of oils are important in the determination of edibility and other industrial applications. All the laboratory analysis were carried out using standard procedures according to AOAC (2000). The acid value, peroxide value, iodine value, saponfication value, refractive index and free fatty acids of cold pressed Indigofera zollingeriana seed oil was found to be 17.11 mg NaOH/g, 23.04 meq/kg, 180.4 gI2/100g, 118.7 mg/KOH/g and 14.10 %. The refractive index (20oC) and specific gravity (25oC) was 2.01 and 1.02 respectively. The extracted oil was Indigo in colour at liquid state. It was concluded the oil has a high acid value, peroxide value and free fatty acid which favours the use of the oil for industrial use such as soap production and cosmetics.
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10

Alkhatib, Ahed J., Sani S. Bala, S. S. Bashir et Abdulhadi M. « CHEMICAL AND PHARMACEUTICAL PROPERTIES OF PEFLOXACIN : A REVIEW ». Indian Research Journal of Pharmacy and Science 5, no 2 (2018) : 1427–31. http://dx.doi.org/10.21276/irjps.2018.5.2.4.

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11

Lee, Hyo Eun, Seok J. Yoon, Jong-Ryeul Sohn, Da-An Huh, Seok-Won Jang et Kyong Whan Moon. « Suitability Assessment of Legal Regulation of Chemical Concentrations According to Vapor Pressure and Damage Radius ». International Journal of Environmental Research and Public Health 16, no 3 (26 janvier 2019) : 347. http://dx.doi.org/10.3390/ijerph16030347.

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Many chemicals used in the industrial field present risks, which differ depending on their chemical properties. Additionally, their various physicochemical properties change considerably with concentration. Many chemicals are used in customized processes in factories in the form of different aqueous solutions. The Korean Chemicals Control Act evaluates “hazardous chemicals,” describes their risks to the public, and regulates their concentration. To prepare against chemical accidents, factories construct models of potential damage radius, which is greatly influenced by a chemical’s vapor pressure. This study selected substances with widely varying vapor pressures (hydrogen fluoride, hydrogen chloride, aqueous ammonia, and hydrogen peroxide) and compared the results of different modeling programs (KORA, ALOHA, PHAST, and RMP*Comp) for various aqueous solution concentrations. The results showed that damage radius and vapor pressure increased similarly for each substance. Damage radius was negligible at low concentrations for all substances studied. Damage radius of ammonia solution increased with vapor pressure. Hydrogen fluoride is not found in aqueous solution at concentrations of less than 37%, and hydrogen peroxide does not show a large damage radius at low concentrations. However, the Chemicals Control Act strictly regulates hydrogen fluoride concentration beginning at 1%, hydrogen chloride and aqueous ammonia at 10%, and hydrogen peroxide at 6%. To effectively prepare against chemical accidents, we must examine scientifically-based, suitable regulations based on physicochemical properties.
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12

Sviderskyi, Valentyn, et Taras Karavayev. « Composition and Physico-Chemical Properties of Ukrainian Kaolins Surface ». Chemistry & ; Chemical Technology 7, no 2 (10 juin 2013) : 197–203. http://dx.doi.org/10.23939/chcht07.02.197.

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13

Sobol, Khrystyna, Serhiy Solodkyy, Nadiya Petrovska, Sergiy Belov, Oleksii Hunyak et Volodymyr Hidei. « Chemical Composition and Hydraulic Properties of Incinerated Wastepaper Sludge ». Chemistry & ; Chemical Technology 14, no 4 (15 décembre 2020) : 538–44. http://dx.doi.org/10.23939/chcht14.04.538.

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The hydraulic properties of ash from incinerated wastepaper sludge were investigated. It is shown that the phase composition of wastepaper sludge after heat treatment is similar to the classical fired carbonate-clay mixes. The necessity of using the combination of retarding admixtures with different action mechanism is shown. The strength in the initial hardening period is ensured by the formation of AFm-phases and ettringite, and subsequently by increasing the role of CSH.
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14

Osadchuk, T. V., O. V. Shybyryn et V. K. Kibirev. « Chemical structure and properties of low-molecular furin inhibitors ». Ukrainian Biochemical Journal 88, no 6 (14 décembre 2016) : 5–25. http://dx.doi.org/10.15407/ubj88.06.005.

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15

Lenz, Stephan, Johannes Birkenstock, Lennart A. Fischer, Willi Schüller, Hartmut Schneider et Reinhard X. Fischer. « Natural mullites : chemical composition, crystal structure, and optical properties ». European Journal of Mineralogy 31, no 2 (7 juin 2019) : 353–67. http://dx.doi.org/10.1127/ejm/2019/0031-2812.

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Асякина, Л. К., В. Ф. Долганюк, И. С. Милентьева, С. Ю. Носкова et О. О. Бабич. « ХАРАКТЕРИСТИКА ФИЗИКО-ХИМИЧЕСКИХ СВОЙСТВ И ПОКАЗАТЕЛЕЙ ХИМИЧЕСКОЙ И МИКРОБИОЛОГИЧЕСКОЙ БЕЗОПАСНОСТИ ФЕРМЕНТАТИВНЫХ ГИДРОЛИЗАТОВ ОТХОДОВ ПОТРОШЕНИЯ ПТИЦЫ ». ТЕХНИКА И ТЕХНОЛОГИЯ ПИЩЕВЫХ ПРОИЗВОДСТВ 3, no 46 (25 septembre 2017) : 5–14. http://dx.doi.org/10.21179/2074-9414-2017-3-5-14.

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Rao, Addanki Sambasiva, Medha A. Dharap et J. V. L. Venkatesh. « Experimental Study of the Effect of Post Processing Techniques on Mechanical Properties of Fused Deposition Modelled Parts ». International Journal of Manufacturing, Materials, and Mechanical Engineering 5, no 1 (janvier 2015) : 1–20. http://dx.doi.org/10.4018/ijmmme.2015010101.

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FDM (Fused Deposition Modelled) parts are chemically treated with two types of chemicals viz Dimethyl ketone (Acetone) and Methyl ethyl ketone to reduce the surface roughness. This chemical treatment method technique not only reduces surface roughness but also makes effect on strength of chemically treated parts of ABS (Acrylonitrile Butadiene Styrene) material. In this study Taguchi method of DOE (Design of Experiments) is conducted on test specimen of “tensile”, “bending” and “izod impact” components which are manufactured through Fused Deposition Modeling process using ABS-P400 material. DOE is conducted to optimize the effect of chemical treatment process parameters on strength of above specimen parts. The process parameters considered for the DOE are “different levels of concentration of chemical, temperature, time, layer thickness etc. ANOVA (Analysis of variance) is used to know the significance of contribution of each of these parameters. Results reveal that the prototypes when treated at optimum condition the tensile strength, flexural strength and izod impact strength improved significantly.
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Gao, Yang, Huiyi Huang, Hongyi Zhao, Houqiang Xia, Miao Sun, Pengcheng Li, Cangsong Zheng, Helin Dong et Jingran Liu. « Phosphorus affects enzymatic activity and chemical properties of cotton soil ». Plant, Soil and Environment 65, No. 7 (1 août 2019) : 361–68. http://dx.doi.org/10.17221/296/2019-pse.

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Pot experiments were conducted in 2017 with two cotton cultivars (CCRI 79 and LMY 28) and three phosphorus (P) levels: 3, 8 and 12 mg P<sub>2</sub>O<sub>5</sub>/kg as P<sub>0</sub>, P<sub>1</sub> and P<sub>2</sub>, respectively. In this study, the soil water-soluble organic carbon content increased as the soil available P (AP) increased, while there were no significant variations for soil total organic matter content among the three AP levels. The activities of invertase, cellulase and urease in cotton soil decreased significantly in the P0. There were positive correlations between invertase and cellulose activities with soil organic carbon and inorganic-nitrogen (N); these correlated negatively with soil C/N ratio and AP level. In addition, high soil AP can raise soil AP and enhance alkaline phosphatase activity, which had a significant negative relationship with the soil C/P ratio. Urease activity had a significant positive relationship with soil NH<sub>4</sub><sup>+</sup>-N, C/P and N/P, as well as a negative correlation with soil C/N. Moreover, soil NH<sub>4</sub><sup>+</sup>-N and NO<sub>3</sub><sup>–</sup>-N in the P<sub>1</sub> and P<sub>2</sub> were lower than in the P<sub>0</sub>, which might be an effect of high AP on soil N availability.
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19

Nyssanbayeva, G., S. Tursunbek, K. Kudaibergenov, Ye Ongarbayev, Z. Mansurov et S. Lubchik. « Synthesis and study of physical-chemical properties of expanded graphite ». International Journal of Biology and Chemistry 9, no 2 (2016) : 36–39. http://dx.doi.org/10.26577/2218-7979-2016-9-2-36-39.

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Kadhim, Alaa Jawad. « Thiazole Amide Derivatives (Synthesis, Spectral Investigation, Chemical Properties, Antifungal Assay) ». NeuroQuantology 18, no 1 (30 janvier 2020) : 16–25. http://dx.doi.org/10.14704/nq.2020.18.1.nq20102.

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21

K. V., Avdiyuk. « KERATINOLYTIC ENZYMES : PRODUCERS, PHYSICAL AND CHEMICAL PROPERTIES. APPLICATION FOR BIOTECHNOLOGY ». Biotechnologia Acta 12, no 2 (avril 2019) : 27–45. http://dx.doi.org/10.15407/biotech12.02.027.

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Trikur, Ivan, Zita Batori-Tartsi, Mykhailo Sichka, Galina Rizak et Vasyl Rizak. « Design of chemically modified bacteriorhodopsin films for information protection systems ». Eastern-European Journal of Enterprise Technologies 5, no 6 (119) (30 octobre 2022) : 6–14. http://dx.doi.org/10.15587/1729-4061.2022.265858.

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The object of this study is the processes of interaction of fragments of purple membranes with certain chemicals, which affect the photochromic properties of bacteriorhodopsin films. This paper considers the possibility of modifying the properties of bacteriorhodopsin films by changing their chemical composition, which will make it possible to use such films to protect information. For this purpose, it has been determined which optical properties of bacteriorhodopsin are most important for its use in the field of information protection; films were made using various chemicals as impurities. It was shown that the introduction of impurities does not affect the absorption spectrum of bacteriorhodopsin, which indicates that it retains its properties. It has been established that impurity substances are evenly distributed in films. By studying the dynamics of photoinduced changes in films with different concentrations of chemical components, the effect of chemical modification on the photocycle of bacteriorhodopsin and the properties of film structures based on it was studied. Based on the results of experimental studies, it was found that by changing the chemical composition of films, it is possible to change the time of storage of the information recorded on them in the range from several to hundreds of seconds continuously. The sensitometric sensitivity of film structures also depends on the chemical composition and can vary in the range from 3.9·10–3 to 54·10–3 m2/J. At the same time, chemical modification is simpler from a technological point and cheaper from a financial point of view compared to other methods that make it possible to achieve similar results. The reported results suggest that chemically modified films based on bacteriorhodopsin have great potential for practical application in the field of information protection and access control
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23

Asehraou, A., M. Faid et M. Jana. « Physico-chemical properties and the microflora of Moroccan black table olives ». Grasas y Aceites 43, no 3 (30 juin 1992) : 130–33. http://dx.doi.org/10.3989/gya.1992.v43.i3.1164.

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Rady, Aly H., et Mohamed A. Madkour. « Changes in physical and chemical properties of palm olein during heating ». Grasas y Aceites 46, no 4-5 (30 octobre 1995) : 270–75. http://dx.doi.org/10.3989/gya.1995.v46.i4-5.936.

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Jariwala, Krunal N. « Analytical Techniques for The Assessment of Physico-Chemical Properties of Ghee ». Indian Journal of Applied Research 4, no 6 (1 octobre 2011) : 216–17. http://dx.doi.org/10.15373/2249555x/june2014/67.

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Tounsi, Leila, Héla Kechaou et Nabil Kechaou. « Study of the physico-chemical and functional properties of carob syrup. » JOURNAL OF OASIS AGRICULTURE AND SUSTAINABLE DEVELOPMENT 3, no 1 (1 juillet 2021) : 20–25. http://dx.doi.org/10.56027/joasd.032021.

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The carob tree has several advantages for all its components, especially for its fruits (carob pods). Several scientific studies have shown that the carob fruit is rich in nutrients and phytochemicals, which explains its use as a raw material for the manufacturing of various products, including carob syrup. Some studies have been carried out on the physicochemical characteristics of this product, but to our knowledge, there are no scientific studies yet regarding its functional properties and its potential use in the food industry. So, this work clearly shows that carob syrup has interesting functional properties. It exhibits an emulsifying capacity (~ 80-87%) comparable to that of soy lecithin (~ 100%), an emulsifier widely used in food formulations. This result reveals that carob syrup can be used as a natural food emulsifier for the formation and stability of emulsions.
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Fedenko, Yuriy, Tatiana Dontsova et Іgor Astrelin. « Physico-Chemical and Sorptive Properties of Nanocomposites Based on Zirconium Oxide ». Chemistry & ; Chemical Technology 8, no 1 (15 mars 2014) : 51–55. http://dx.doi.org/10.23939/chcht08.01.051.

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Babatunde, Olufemi, Sergyi Boichenko, Petro Topilnytskyy et Victoria Romanchuk. « COMPARING PHYSICO-CHEMICAL PROPERTIES OF OIL FIELDS OF NIGERIA AND UKRAINE ». Chemistry & ; Chemical Technology 11, no 2 (15 juin 2017) : 220–25. http://dx.doi.org/10.23939/chcht11.02.220.

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Oladapo, Silas A., et Adeyemi E. Adetoro. « Assessment of some Chemical Properties of Isan - Ekiti Soil, Southwestern Nigeria ». International Journal of Trend in Scientific Research and Development Volume-2, Issue-6 (31 octobre 2018) : 689–92. http://dx.doi.org/10.31142/ijtsrd18571.

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Kazybekova, S. K., N. K. Bishimbaeyva, A. S. Murtazina, S. M. Tazhibayeva et R. Miller. « Physico-chemical properties of physiologically active polysaccharides from wheat tissue culture ». International Journal of Biology and Chemistry 8, no 2 (2015) : 18–22. http://dx.doi.org/10.26577/2218-7979-2015-8-2-18-22.

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Friedlová, M. « The influence of heavy metals on soil biological and chemical properties ». Soil and Water Research 5, No. 1 (26 février 2010) : 21–27. http://dx.doi.org/10.17221/11/2009-swr.

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Soil samples were collected at alluvial sites of the Litavka River, which flows through the Beroun and Př&iacute;bram cities in Central Bohemia Region of the Czech Republic in 2005 and 2006. Higher heavy metal content in soils (Cd, Pb, Zn, Cu) is due to composition of the parent rock, emissions from lead processing industry and the leak of toxic material from the steel works sludge ponds in the 1970s and 1980s. The samples were collected from six sites located at different distances from the contamination source (the former sludge ponds) and chemical and biological properties were determined. The ratio of the microbial biomass carbon to oxidisable carbon content dropped down significantly on more heavily contaminated sites. Basal respiration activity did not correlate with the content of heavy metals in soil, but there was certain declining tendency with increasing intensity of soil contamination. Respiration activities significantly correlated with the total carbon, oxidisable carbon and the total nitrogen content. The metabolic quotient showed higher values with increasing contamination. Dehydrogenases and arylsulphatase activities decreased with increasing contamination. Urease activity has also a declining tendency but its relation to different intensity of contamination was not unambiguous. Urease activity has shown a relationship with the content of total nitrogen in soil. No relationship was found between the total sulphur content and arylsulphatase activity. Dehydrogenases, arylsulfatase and urease activities significantly correlated with the microbial biomass carbon.
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Ribeiro, A. P. B., R. Claro da Silva, L. A. Gioielli, M. I. De Almeida Gonçalves, R. Grimaldi, L. A. G. Gonçalves et T. Guenter Kieckbusch. « Physico-chemical properties of Brazilian cocoa butter and industrial blends. Part I Chemical composition, solid fat content and consistency ». Grasas y Aceites 63, no 1 (24 janvier 2012) : 79–88. http://dx.doi.org/10.3989/gya.069011.

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Bansode, Sanjay, Ramesh Kapadnis, Vasant Wagh, Sampat Kale et Habib Pathan. « Comparative Studies on Physico-Chemical Properties of Indium Sulfide Films Deposited under Different Deposition Conditions by Chemical Bath Deposition ». Chemistry & ; Chemical Technology 8, no 4 (5 décembre 2014) : 441–44. http://dx.doi.org/10.23939/chcht08.04.441.

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Khoirudin, Imam. « The Impact of Land Fires on Soil Chemicals Propertiest (pH, Organic Carbon, Nitrogen, Phosphor, and Potassium) ». Jurnal Agroekoteknologi Tropika Lembab 1, no 1 (31 juillet 2019) : 11. http://dx.doi.org/10.35941/jatl.1.1.2018.1503.11-15.

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This result aims to determine the impact of land fires on chemicals soil. Forest fire data Obtained in the region of Research and Edication Forest Bukit Soeharto Mulawarman University (HPPBS UNMUL). The method was used on research are descriptive and comparative by comparing the result of soil chemicals properties analysis of burn and unburned lands. The soil chemistry properties of this result is pH, Organic Carbon, Nitrogen, Phosphor and Potassium. Soil sampling was random system on this methods. Soil samples be distinguished by type and depth of soil sampling. The results of the soil analysis chemical properties then was compared based on assessment of soil chemical properties which refers to the assessment criteria soil chemical properties developed by Soil Research Institute Bogor, 2005. The results showed the fires occurring after 1 year influence of soil chemicals properties such as pH, Organic Carbon, Nitrogen, Phosphor and Potassium.
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Barkhudarov, E. M., I. A. Kossyi, Yu N. Kozlov, S. M. Temchin, M. I. Taktakishvili et Nick Christofi. « Multispark Discharge in Water as a Method of Environmental Sustainability Problems Solution ». Journal of Atomic and Molecular Physics 2013 (21 juillet 2013) : 1–12. http://dx.doi.org/10.1155/2013/429189.

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Multispark discharge excited in water is described, and its useful physical and chemical properties are discussed in the light of some environmental issues. Discharge of such a type generates hot and dense plasmoids producing intense biologically active UV radiation and chemically active radicals, atoms, and molecules. Simultaneously, discharge creates strong hydrodynamic perturbations and cavitation bubbles. Particular attention is given to factors influencing on water purity with special reference to discharge application for effective sterilization of water and its cleaning of harmful chemicals. The gas discharges of this type show considerable promise as a means for solving some actual plasma-chemical problems. The above-mentioned discharge properties have been demonstrated in a series of laboratory experiments, which proved the efficiency of disinfection of potable and waste water, water cleaning of pesticide (herbicide) contaminations, and conversion (recovery) of natural methane.
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Ahmad, Anees, Bazlul Mobin Siddique, Mohamad Hakimi Ibrahim, Sufia Hena, Mohd Rafatullah et Mohd Omar A. K. « Physico-chemical properties of blends of palm olein with other vegetable oils ». Grasas y Aceites 61, no 4 (25 juin 2010) : 423–29. http://dx.doi.org/10.3989/gya.010710.

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Paiva, H., A. Velosa, P. Cachim et V. M. Ferreira. « Effect of pozzolans with different physical and chemical characteristics on concrete properties ». Materiales de Construcción 66, no 322 (12 avril 2016) : e083. http://dx.doi.org/10.3989/mc.2016.01815.

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Chang, R. Ch, Ch Y. Li et S. Y. Shiau. « Physico-chemical and sensory properties of bread enriched with lemon pomace fiber ». Czech Journal of Food Sciences 33, No. 2 (3 juin 2016) : 180–85. http://dx.doi.org/10.17221/496/2014-cjfs.

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Mirosław, Kobierski, Bartkowiak Agata, Lemanowic Joanna et Piekarczyk Mariusz. « Impact of poultry manure fertilization on chemical and biochemical properties of soils ». Plant, Soil and Environment 63, No. 12 (12 décembre 2017) : 558–63. http://dx.doi.org/10.17221/668/2017-pse.

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The aim of the research was to evaluate the chemical properties and enzymatic activity of arable soils which, for the period of 10 years, were fertilized with poultry manure (PM). Fertilization with PM resulted in a significant increase in the content of organic carbon and total exchangeable bases in soil. The application of that fertilizer increased the pH value. Fertilization with PM also slightly increased the total content of copper, manganese and iron. There was found, however, a significant increase in the total content of Zn. The annual application of 10 tonnes of PM significantly increased the content of phosphorus and potassium available to plants. That fertilizer inhibited the activity of both alkaline and acid phosphatase, which must be related to a very high content of phosphorus available to plants. Poultry manure resulted in higher values of the biological index of fertility of soil, whereas the activity of phosphomonoesterases was significantly lower.
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Wei-Chen, Pan, Liu Yu-Ming et Shiau Sy-Yu. « Effect of okara and vital gluten on physico-chemical properties of noodle ». Czech Journal of Food Sciences 36, No. 4 (3 septembre 2018) : 301–6. http://dx.doi.org/10.17221/329/2017-cjfs.

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Okara, a by-product during processing of soymilk or tofu, is rich in dietary fiber, protein and phytochemicals. Therefore, it can be useful as a functional ingredient with health-promoting attributes. This study was to investigate the effects of addition of dried okara powder (DOP) and vital gluten (VG) on rheological, antioxidative and sensory properties of noodle. Results showed that high DOP amount (10–15%) significantly reduced optimum cooking time, extensibility, tensile strength and elasticity of noodle. Increasing DOP amount led to the increase in total phenolics and flavonoids, as well as radical-scavenging activity of noodle. Supplement of 6% vital gluten could improve the quality of 10%-DOP noodle, including cooking loss, tensile property, elasticity and sensory acceptability. Therefore, we suggest that enriched noodle can be prepared with 5% DOP or 10% DOP plus 6% VG in order to increase the intake of phytochemicals and maintain the sensory acceptability of consumers.
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Çakır, Çağım Akbulut, Tuba Büyüksırıt Bedir et Özlem İstanbullu Paksoy. « KARGI TULUM PEYNİRİNİN BAZI KİMYASAL, TEKSTÜREL VE MİKROBİYOLOJİK ÖZELLİKLERİNİN BELİRLENMESİ ». Euroasia Journal of Mathematics, Engineering, Natural & ; Medical Sciences 8, no 17 (25 septembre 2021) : 127–34. http://dx.doi.org/10.38065/euroasiaorg.626.

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Kargı Tulum cheese is a type of cheese produced in the highlands in summer seasons from sheep, goat, cow and buffalo milk and their mixtures in certain proportions in the Kargı district of Çorum and put on the market in autumn. It is particularly consumed in Çorum, Kastamonu, Samsun and Ankara provinces. For the marketing of cheeses, tulums made of sheep and lamb skins are cleaned and cut into small pieces and sewn. Cheese curds, after the whey draining, are pressed into the prepared tulums by being compressed so that there is no airgap in them. Traditional production and sales methods are stil used in Kargı Tulum cheese, therefore standardized products cannot be obtained in every production. For this reason, the stages involved in the traditional cheese production and the packaging material used for ripening affect the chemical and textural properties, microbial load and therefore, quality of the product. There are few number of studies on Kargı Tulum cheese and no extensive study examined the texture and rheological characteristics of it. Cheese texture is influenced by many factors, such as composition, microbiological load, ripening conditions and proteolysis; therefore texture properties should be evaluated together with the chemical and hygenic parameters. In this study, some chemical (pH, titrationacidity, total solids, fat), textural (TPA) and microbiological characteristics (total mesophilic count, mold and yeast counts, coliform) of tulum cheese samples produced according to the tradional method with three replicates were determined. Moisture content of the Kargı Tulum cheese samples were 43.45%, fat content was found % 25.5, pH was 4.55, acidity (lacticacid %) was 2.55. According to TS 3001 Tulum Cheese Standard our Kargı Tulum cheese samples were classified as full fat cheese and our chemical composition results were in accordance with the standard. We found statistically significant differences between cheese samples for all texture parameters measured (firmness, adhessiveness, springiness, gumminess, resilience) except for chewiness. Average total mesophilic aerobic bacteria countwas 6.40 log cfu.g-1 mean mold and yeast counts were found to be 1.07 log cfu.g-1. Coliform group bacteria were not found in the analyzed samples. When microbiological results were compared statistically, it was determined that there was no significant difference between cheese samples.
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TO, Adedeji. « Chemical composition and organoleptic properties of Cocoyam starch-wheat flour blend noodles ». Archive of Food and Nutritional Science 1, no 2 (2017) : 058–62. http://dx.doi.org/10.29328/journal.afns.1001009.

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S, Sasikala, Dr Radhaisri S et Deeptha Kumar. « Analysis of Physio-Chemical Properties of Mangosteen Rind Extract from Industrial Waste ». International Journal of Trend in Scientific Research and Development Volume-2, Issue-6 (31 octobre 2018) : 1522–26. http://dx.doi.org/10.31142/ijtsrd18898.

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Gougoulias, N., G. Papapolymerou, V. Karayannis, X. Spiliotis et N. Chouliaras. « Effects of manure enriched with algae Chlorella vulgaris on soil chemical properties ». Soil and Water Research 13, No. 1 (24 janvier 2018) : 51–59. http://dx.doi.org/10.17221/260/2016-swr.

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The effect of the algal species Chlorella vulgaris at six different ratios (0, 1, 2, 3, 4, 5 g) of air dried algae biomass, mixed with 10.18 g of sheep manure, added to 50 g of soil, and incubated for a period of 15 weeks was studied in a laboratory in order to detect the role of adding small amounts of admixed algal biomass to soil in biodegradation of soil organic carbon. The obtained data showed that mineralization of soil organic carbon increased by 16.2–35.9% at all rates of algae addition compared to the control, while the highest increase was observed at the highest rates of algae addition. There was a 40–50% increase in the available form of potassium, while the highest increase was also observed at the highest rates of algae addition. The four times higher rates of added algae increased the corresponding content of nitrate nitrogen by 20–30%, while ammonium nitrogen contents decreased by 9.5–35.7% for all amounts of added algae in comparison with the control. The available forms of copper, manganese, and zinc were also increased for all amounts of added algae by 56.8–61.9%, 55.8–67.3%, and 34.1–40.6%, respectively. On the contrary, the addition of algae did not indicate significant differences among treatments as concerns organic or available phosphorus contents. The results proved the effect of the algae Chlorella vulgaris as an accelerator agent in biodegradation of soil organic matter, without any significant negative impact on soil chemical properties.
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Hateef, Areej Adnan, Marwa Abdul Muhsien Hassan et Najim A. Sumoom. « Physical properties of SnO2 : Co thin films prepared by chemical spray pyrolysis ». Journal of Zankoy Sulaimani - Part A 15, no 4 (4 septembre 2013) : 29–36. http://dx.doi.org/10.17656/jzs.10271.

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Krasnova-, Tamara, Natalya Gora et Nadegda Golubeva. « INFLUENCE OF PHYSICAL-CHEMICAL PROPERTIES OF ACTIVE CARBONS ON GALLIC ACID ADSORPTION ». Foods and Raw Materials 3, no 1 (1 juillet 2015) : 120–25. http://dx.doi.org/10.12737/11467.

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OP, Ohini. « Chemical, Anti-Nutritional Factors and Sensory Properties of Maize-Kidney Bean Flours ». Food Science & ; Nutrition Technology 4, no 6 (5 novembre 2022) : 1–9. http://dx.doi.org/10.23880/fsnt-16000203.

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In recent years, research efforts in developing countries have focused on the improvement of protein quality of food products due to mass malnutrition. TUWO is a traditional food made from maize flour and consumed by all ages in Nigeria. Flours blends were obtained from Maize and kidney bean flours using the following proportions: A= (100% maize flour as control), B= (90:10), C= (85:15), D= (80:20), E= (75:25). Products were analysed for proximate, functional, pasting, antinutrients and sensory properties. Proximate analysis showed increased in moisture, protein, ash, fiber contents while the reverse was the case for carbohydrate and fats. Functional analysis revealed bulk, water absorption and swelling capacities decreased while foaming, gelatinization, oil absorption capacities increased as substitution of kidney bean flour increased indicating good attributes suitable for food production. Pasting analysis showed increased in peak, trough, final, setback, and peak temperature as the kidney bean flour increased while the reverse was the case for peak time and breakdown viscosities. The antinutrients factors (Phytate, Tannins, Oxalate and Trypsin inhibitor) were found to be within the acceptable levels. The result of the sensory scores showed that sample C was the most liked among the entire samples at the ratio of (85% maize flour and 15 % kidney beans flours). Kidney beans and maize flour can be used to improve the nutrient composition and other quality attribute of TUWO.
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Kazerovska, Kristīne, Māris Kļaviņš et Judīte Dipāne. « Approaches for Management of Chemical Substances : Challenges and Solutions ». Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 62, no 1-2 (1 janvier 2008) : 1–8. http://dx.doi.org/10.2478/v10046-008-0008-z.

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Approaches for Management of Chemical Substances: Challenges and Solutions This article analyses the development of approaches for management of chemical substances in the frame of current reform of chemicals policy at the European Union level with regard to implementation of REACH Regulation No. 1907/2006. REACH is considered as an integrated approach to the control of the production, import and use of chemicals in the European Union, especially of those chemical substances with the most hazardous properties. The new approach covers both the strengths of old and new chemical policies, also requires revision of existing understandings about chemical production, import and use: responsibilities of all involved actors, the chemicals supply chain, and information flow within chemicals supply chain.
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AI, Nasr. « Evaluation Abu-Dleek Sheep Leathers Properties ». International Journal of Zoology and Animal Biology 3, no 1 (2020) : 1–3. http://dx.doi.org/10.23880/izab-16000201.

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Abu-Dleek sheep are from animal hair producers and live under arid conditions and hot climate. This study aims to evaluate the physical and chemical properties of Abu-Dleek tanned leathers. Fifteen sheep skins were collected and divided into three tanning groups; chrome tanning, vegetable tanning with quebracho and vegetable tanning with mimosa. After tanning, all tanned leathers were tested physically and chemically. Data showed increments in tensile strengh, tearing strengh, bursing stretch, permeabiliy of water vapor, pH and ash values of chrome tanned leathers versus vegetable tanned leathers. The results declared the superurity of the chrome tanned leathers’ quality, while quebrcho tanned leathers’ quality was surpased mimosa tanned leathers. It could be concluded the convenient of Abu-Dleek tanned leathers to be used in a wide range of manufacuring purposes like garments, bags and lining.
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Barber, M. Craig, Luis A. Suárez et Ray R. Lassiter. « Modelling Bioaccumulation of Organic Pollutants in Fish with an Application to PCBs in Lake Ontario Salmonids ». Canadian Journal of Fisheries and Aquatic Sciences 48, no 2 (1 février 1991) : 318–37. http://dx.doi.org/10.1139/f91-044.

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A model describing passive accumulation of organic chemicals from the aqueous environment and contaminated food in fish is developed. This model considers both biological attributes of the fish and physicochemical properties of the chemical that determine diffusive exchange across gill membranes and intestinal mucosa. Important biological characteristics addressed by the model are the fish's gill morphometry, feeding and growth rate and fractional aqueous, lipid, and nonlipid organic composition. Relevant physicochemical properties are the chemical's molar volume and n-octanol/water partition coefficient (Kow), which are used to estimate the chemical's aqueous diffusivity and partitioning to the fish's lipid and nonlipid organic fractions respectively. The model is used to describe and to analyze the bioaccumulation of polychlorinated biphenyls (PCBs) in Lake Ontario alewife (Alosa pseudoharengus), coho salmon (Oncorhynchus kisutch), rainbow trout (Oncorhynchus mykiss), brown trout (Salmo trutta), and lake trout (Salvelinus namaycush).
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