Journal articles: 'Physico-chemical analyzes'

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Prekalla, Jetmir, Nexhdet Shala, and Arsim Elshani. "SENSORY PROPERTIES AND PHYSICO-CHEMICAL ANALYZES OF PASTEURIZED MILK." International Journal of Ecosystems and Ecology Science (IJEES) 9, no. 3 (August 12, 2019): 523–28. http://dx.doi.org/10.31407/ijees9315.

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Scripca, Laura A., and Sonia Amariei. "Research on Honey Crystalization." Revista de Chimie 69, no. 10 (November 15, 2018): 2953–57. http://dx.doi.org/10.37358/rc.18.10.6660.

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Crystallization of honey is a natural process and guarantee of authenticity. The aim of the study is to evaluate the influence of physico-chemical parameters on the process of crystallization and on crystal size. The interest in studying the factors influencing the crystallization process is due to the fact that most consumers, especially children, are reserved for the purchase and consumption of a crystallized honey, the commercial aspect being very important to them. Three samples of honey of different floral origins were used for the physico-chemical and microscopic analysis. The analyzes were carried out throughout 30 days every sample in triplicate. In terms of physicochemical following parameters were analyzed: acidity, diastase index, hydroximethylfurfural, humidity, invert sugar, glucose, fructose, fructose / glucose ratio and the microscopic analyze of crystals size. The parameter values resulting from the research study are in accordance with the legislation in force. Statistical analysis of experimental data highlights the influence of ratio fructose / glucose and humidity on the honey crystallization.

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Lopes de Araújo, Sinthya Meire, and Alex Augusto Gonçalves. "A New Ready-To-Bake Seafood Meal Based on Pacific White Shrimp: Product Development, Cost Evaluation, Consumer Acceptability, and Shelf Life Stability." Open Food Science Journal 11, no. 1 (February 28, 2019): 18–24. http://dx.doi.org/10.2174/1874256401911010018.

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Background: Considering that consumers are increasingly demanding and attentive to a healthy diet, while also looking for food that is easy to prepare, the objective of this work was to develop a new value-added product with Pacific white shrimp. Methods: Fresh shrimps were headless, eviscerated, cut, washed, immersed in brine (10% NaCl + 5% sodium tripolyphosphate – STPP, 30 min), drained, weighed, immersed in sweet-sour sauce (15 min), drained, stuffed with cream cheese, weighed, vacuum packed, frozen (-30°C / 24h), and stored (-18ºC). Microbiological, centesimal composition and physico-chemical analyzes were performed for fresh and stuffed shrimp. Confirmed the microbiological safety, samples were baked (180ºC, 20 min) and sensorially evaluated. The shelf life study for the frozen stuffed shrimp was carried out during 180 days of storage (-18ºC) and at each 45 days, samples were withdrawn for microbiological and physico-chemical analyzes. Results: All parameters analyzed were within the limits of Brazilian legislation, which demonstrated the initial shrimp freshness, and hygienic health care. The overall acceptance test was 8.72, the acceptability index of 96% and purchase intention of 82%. The final cost per piece was lower and viable. The nutritional value was in accordance to the literature for this shrimp, and the physico-chemical results during the shelf life evaluation were stable. Conclusion: The vacuum packaging, and freezing storage, associated with hygienic-sanitary care promoted the stability of microbiological assessment, and physical-chemical properties, and the overall quality and safety product for the consumer, which can be a new alternative for the shrimp industry.

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Popa, Ionuţ Radu, Mihaela Tiţa, Letiţia Oprean, Ramona Iancu, Ecaterina Lengyel, and Adina Frum. "Researches on Physico-Chemical and Microbiological Characteristics of Sheep and Cow Milk from Cristian Farm, Romania." Acta Universitatis Cibiniensis. Series E: Food Technology 18, no. 1 (June 1, 2014): 77–84. http://dx.doi.org/10.2478/aucft-2014-0009.

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Abstract This study was conducted over a period of three month in the Cristian farm, Sibiu. For the physical, chemical and microbiological analyzes were taken a number of 15 samples per month. From physico-chemical point of view the content evolution of fat, not fat solid substance, density, protein, freezing point, temperature, lactose, conductivity, pH, water addition was followed. Samples were analyzed using the milk analyzer Ekomilk Total of the Research Centre in Biotechnology and Microbiology of the "Lucian Blaga" University. The microbiological contamination of milk was done by determining the total number of bacteria and coliform bacteria. From microbiological point of view it was observed that these conditions are largely met, but a more rigorous control on the cleanliness of utensils and of the staff is required.

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Hauryliuk, A. N., O. B. Dormeshkin, and G. Kh Cherches. "Physico-chemical features of acid decomposition of dolomite." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 1 (February 10, 2021): 109–18. http://dx.doi.org/10.29235/1561-8331-2021-57-1-109-118.

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The results of studies of the physico-chemical regularities of the acid decomposition of magnesium-containing raw materials are presented and the optimal technological mode of the individual stages of obtaining magnesium sulfate is determined. It has been established that the process of obtaining magnesium sulfate based on dolomite includes the following stages: decomposition of magnesium-containing raw materials with sulfuric acid; filtration of the resulting suspension with separation of calcium sulfate and insoluble residue and subsequent washing; crystallization and separation of magnesium sulfate; drying the target product. The main technological parameters that determine the stage of sulfuric acid decomposition are: the rate of sulfuric acid, the duration of decomposition, the method and procedure for introducing reagents, the content of magnesium sulfate in the liquid phase of the suspension. In this case, the concentration of sulfuric acid cannot be considered as the main technological parameter, since its numerical value is selected depending on the value of the final content of magnesium sulfate in the liquid phase, which in turn is determined by its solubility in water. It has been proven that the use of a flocculant at the decomposition stage provides an increased filtration rate, improved filtration performance, as well as keeping the filter cloth uncontaminated. The results of chemical and X-ray phase analyzes confirmed that magnesium sulfate obtained from domestic dolomite raw materials in its composition corresponds to magnesium sulfate obtained from foreign types of magnesium-containing raw materials - magnesite, brucite - and fully complies with the requirements of TU 2141016-32496445-00 “Magnesium sulfate”.

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Dufka, Ámos, and Tomáš Melichar. "The Evaluation of the Effect of Crystallization Additives on Long Term Durability of Cement Composites." Solid State Phenomena 276 (June 2018): 265–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.265.

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The article deals with the influence of crystallization additives on the life of self-compacting concrete (so-called SCC concrete), which are exposed to chemically aggressive environments. The focus is not only on the effect of the crystallization additive on the characteristics of the capillary-pore structure of SCC concrete, but especially long life durability of self-compacting concrete (two years expozition). The effect of individual types of aggressive environment is assessed on the basis of a set of physico-mechanical and physico-chemical analyzes.

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Amaral, Sheyla Maria Barreto, Felipe Sousa da Silva, Raimunda Valdenice da Silva Freitas, Maria Jéssica de Almeida Souza, Luana Guabiraba Mendes, and Antônio Belfort Dantas Cavalcante. "Microbiological and physical chemical evaluation of traditional cream cheese brands with different market value." Research, Society and Development 9, no. 10 (September 20, 2020): e1439108262. http://dx.doi.org/10.33448/rsd-v9i10.8262.

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The objective of this study was to evaluate the physical-chemical and microbiological characteristics of four brands of traditional cream cheeses with different market value. Three batches of the four commercial brands of cream chesses were acquired, totaling 12 samples. The differences in pH, titratable acidity, starch, fat in dry extract, moisture, ash, lipids, protein, and carbohydrates were measured by physico-chemical analyzes, while the of thermotolerant coliforms and Staphylococcus aureus spp. counts were performed by microbiological analyzes. Regarding the four evaluated brands, < 3 Most Probable Number of thermotolerant coliforms and an absence of colonies characteristic of Staphylococcus aureus were found. There was no significant difference between the brands studied at 5% of significance for the fat in dry extract, moisture, ash and lipids. All the analyzed cream cheese samples differed significantly (p < 0.05) for the starch content. The analyzed samples showed satisfactory hygienic-sanitary quality. The physical-chemical evaluation results presented standardization in the cream cheese preparation, regardless of the amount charged, however, there was a lack of information on the use of starch on all labels.

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Cherim, Melat, Rodica Sirbu, Aneta Tomescu, Marius Florentin Popa, and Emin Cadar. "Comparative Studies on the Physico-chemical Characteristics of Bio-materials with Collagen from Calf and Fish Skins from Black Sea." Materiale Plastice 56, no. 1 (March 30, 2019): 179–85. http://dx.doi.org/10.37358/mp.19.1.5147.

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Collagen hydrolysers are three-dimensional polymeric materials with limited cross-linking and high hydrophilicity, having multiple medical applications. The most used collagen is the one extracted from bovine skin, which is now the industrial source of collagen. Due to the outbreak of some threatening diseases such as BSE, transmissible spongiform encephalopathy, foot-and-mouth disease, researchers have sought a safer alternative to collagen. This was the marine resource, which offered multiple opportunities to capitalize on clean sea-water raw material. This paper presents a comparative study of the physico-chemical properties of collagen hydrogels derived from collagen obtained from calf and skin from the Black Sea. Physico-chemical and spectrophotometric analyzes were performed to determine the structure. Studies have been conducted to analyze rheological behavior, antioxidant activity and antimicrobial activity. The total antioxidant capacity (ACL) is higher for collagen mixtures with 40% ethyl alcohol and shows higher values for fish collagen compared to calf collagen. Antimicrobial analysis shows that all collagen hydrogels show antimicrobial activity, both gram-positive (Staphylococcus aureus ATCC 6538P) and gram-negative (Escherichia coli ATCC 10536), which increases with increasing collagen concentrations.

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Kovalevska, I. V., and O. A. Ruban. "Research of physico-chemical and technological properties of thioctic acid." Farmatsevtychnyi zhurnal, no. 6 (August 14, 2018): 71–78. http://dx.doi.org/10.32352/0367-3057.6.16.05.

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Characteristics and relevance of article topic. Analysis of the literature data shows that the thioctic acid preparations are widely used in the treatment of various diseases. At it’s parenteral application inter- and intraindividual level at the plasma can vary significantly. Therefore, the bioavailability of thioctic acid according to the results of clinical researches is only 30% and efficacy largely dependent on the technological features of the dosage form manufacturing process. The goal of paper was researches of the thioctic acid physico-chemical properties for development of composition and technology of solid dosage form with improved bioavailability. Thioctic acid was the object of the study. The complex of physical, chemical and technological tests were used during researches: microscopic, thermal analyzes studies of bulk density, flowability, compression ratio, hygroscopicity, dissolution. Conclusions. According to thermal analysis, thermal stability of thioctic acid sample has been established within 20–180 °C. The results can be used for explanation the temperature regime in the preparation of solid dispersions of thioctic acid by the melting method. Solubility determination according to SP of Ukraine II-ed. and microscopic method showed that the substance is readily soluble in 96% ethanol, which leads to the conclusion about the possibility of preparation thioctic acid solid dispersions by dissolution method. During researches were established physico-chemical and technological properties of the thioctic acid substance, produced by Shanghai modern pharmaceutical Co., LTD (China). Were established that the substance is hygroscopic as evidenced by the change in appearance and weight. It was determined that the substance does not have a satisfactory yield (Carr index – 1,39, slope angle – 60°), compression ratio is 0,495, which is indicative of the lack of sample strength after the removal of pressure. The results of the studies suggest that the physicochemical properties of the substance needed modifications in the manufacture of solid dosage forms with thioctic acid.

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Karuppasamy, Karuppasamy, Sethuramachandran Thanikaikarasan, D. Eapen, Rajendran Antony, Subramaniam Balakumar, Thaiyan Mahalingam, and Xavier Sahaya Shajan. "Effect of Nanochitosan on Structural, Thermal and Electrochemical Properties of Poly Ether Based Polymer Electrolytes Complexed with Lithium Bis(Trifluoromethanesulfonyl Imide)." Journal of New Materials for Electrochemical Systems 17, no. 3 (October 3, 2014): 197–203. http://dx.doi.org/10.14447/jnmes.v17i3.422.

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In this research, nanocomposite membranes were prepared using polyethylene oxide as polymer host, lithium bis(trifluoromethanesulfonyl imide) as salt and nanochitosan as inert filler. Initially nanochitosan was prepared from chitosan by ionotropic gelation method. Nanocomposite membranes were prepared by solvent free membrane hot press technique. The prepared membranes possessed excellent physico-chemical properties. The complexing behavior and structural reorganization in polymer electrolytes were analyzed by XRD and FT-IR analyzes. The decrease in crystalline nature of polymer electrolytes was confirmed by DSC analysis. The electrolyte S3 possessed high conductivity and attained a maximum of 10-3.01S/cm.

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Cochiorca, Alina, Valentin Nedeff, Narcis Barsan, Ion Sandu, Emilian Mosnegutu, Dana Alexandra Chitimus, Andrei Victor Sandu, and Oana Irimia. "Surface Water and Groundwater Quality Evaluation in a Mining Area." Revista de Chimie 71, no. 6 (July 1, 2020): 124–31. http://dx.doi.org/10.37358/rc.20.6.8177.

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This paper presents a monitoring of groundwater and surface water in the mining area Tg. Ocna, by analyzing 16 physico-chemical parameters (pH, turbidity, dissolved oxygen, Pb, Ni, Cu, Fe, Mn, Zn, Cr, Mg, SO42-, Al, NO2-, NO3-, NH4+), from three rivers Slanic, Trotus and Valcele, a small lake Groapa Burlacu, a fountain and three monitoring drilling wells (F11, F16 and F17). Studies on the quality of surface water and groundwater in areas near mines are important due to extraction and exploitation of salt. The samples were collected in April 2019. Following the analyzes, their results are included in the following concentration ranges: pH 7.21 to 8.46 unit. pH, turbidity 0.54 to 169 NTU, dissolved oxygen 6 to 8.59 mg/L, Pb 0.075 to 0.095 mg/L, Ni 0.026 to 1.05 mg/L, Cu 0.088 to 0.809 mg/L, NO2- 0.001 to 0.037 mg/L and NO3- 0.290 to 4.34 mg/L. The pH, turbidity and dissolved oxygen were measured in situ using portable equipment�s. As for the other parameters, they were analyzed in the water laboratory from Vasile Alecsandri University of Bacau by using spectrophotometry. Some concentrations of the physico-chemical indicators of the water samples analyzed were found to be more than the water quality classes.

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Kedi, Atolé Brice Bienvenu, Yao Francis Kouame, Seka Simplice Kouassi, Alika Odile Abry, and Koffi Félix Konan. "Physico-chemical characterization of liquid waste from sugar production unit labs in Zuenoula, Côte d'Ivoire." International Journal of Biological and Chemical Sciences 14, no. 7 (December 7, 2020): 2641–51. http://dx.doi.org/10.4314/ijbcs.v14i7.22.

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Managing liquid waste from the laboratories of Integrated Agricultural Unit (IAU) of Zuénoula (Côte d´Ivoire) is a major concern for the decision-makers of the company, who are working to solve this problem in their sustainable development policy. This work aims at quantifying liquid waste from the agronomic laboratories and factory of IAU of Zuénoula and to assess their level of pollution. The quantities of waste produced daily are estimated at 28.5 L, 52.6 L and 2600 L respectively for waste from the agronomy laboratory, the factory laboratory and from the rinsing water from latter's glassware. The following parameters were analyzed, temperature, pH, conductivity, turbidity, total suspended solids, COD, BOD5, total nitrogen, total phosphorus, zinc, copper, lead and mercury. The results of these analyzes generally showed that waste produced did not comply with national standards. In particular, the level of lead was very high in these liquid wastes and reached 160 times the standard value. These results require a waste treatment system, which would reduce all the parameters, in particular those of the most noxious metals (lead and mercury).Keywords: Heavy metals, Pollution, Industrial unit, Ivorian standards, Wastewater.

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Neiva, Déborah Santos, Juliana Almeida Rocha, Afrânio Farias De Melo Junior, Dario Alves Oliveira, Murilo Malveira Brandão, Vany Perpetua Ferraz, Vanessa De Andrade Royo, and Elytania Veiga Menezes. "Physico-Chemical Characterization and Fatty Acid Profile of the Acrocomia emensis (Arecaceae) Seed Oil." Journal of Agricultural Science 10, no. 1 (December 13, 2017): 264. http://dx.doi.org/10.5539/jas.v10n1p264.

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In Brazil there are several oleaginous plants, with the potential to supply oil as raw material for various types of industries (cosmetic, pharmaceutical, energy, among others), among them we have the Acrocomia emensis (Arecaceae) known as tucum rasteiro. The objective of this work was to realize: extraction of the oil of the almonds using two types of cold mechanical press (walrus type and manual hydraulic type of 15 tons), physical-chemical analyzes (acidity index, peroxides, refraction, moisture and volatile material, ash, viscosity and density at 25 ºC) and fatty acid profile of the oil extracted from almonds of A. emensis from three localities in the northern state of Minas Gerais, Brazil (Bonito de Minas, Brasília de Minas and Montes Claros). The values of the physical-chemical indexes varied among the samples from the different locations. Extraction using walrus type press provided higher yield. The fatty acids of the oils of the three origins were: caprylic, capric, lauric, myristic, palmitic, stearic, oleic and linoleic. The majority in the three samples were the lauric acid.

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Santos, Dyego da C., Ana P. T. Rocha, Josivanda P. Gomes, Emanuel N. A. de Oliveira, Esther M. B. de Albuquerque, and Gilmar T. de Araujo. "Storage of ‘umbu-cajá’ pulp powder produced by lyophilization." Revista Brasileira de Engenharia Agrícola e Ambiental 20, no. 12 (December 2016): 1118–23. http://dx.doi.org/10.1590/1807-1929/agriambi.v20n12p1118-1123.

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ABSTRACT This work aimed to study the chemical and physical stability of ‘umbu-cajá’ powders produced by lyophilization during storage. ‘Umbu-cajá’ pulps formulated with different concentrations of gum arabic (10, 20 and 30%), previously frozen, were dehydrated in benchtop lyophilizer at -40 °C for 48 h and disintegrated to obtain the powder, which was stored in laminated packages for 180 days at ambient conditions, with physical, chemical and physico-chemical analyzes performed at the beginning and every 30 days of storage. According to the results, all investigated parameters were significantly altered throughout the storage, yet with less intense variations for important variables, such as ascorbic acid, reducing sugars and titratable acidity. At the end of storage, all powders were microbiologically safe.

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Tamame, Maria, and Ofelia Naab. "pampeanas flower honeys Condalia microphylla Cav. and Centaurea solstitialis L .: melissopalynological physico-chemical analyzes related to characters." Revista del Museo Argentino de Ciencias Naturales 5 (2003): 371–81. http://dx.doi.org/10.22179/revmacn.5.148.

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Miloudi Hilali, Hanae El Monfalouti, and Badr Eddine Kartah. "Valorization of argan oil: all you need to know about argan oil from Morocco." International Journal of Research in Pharmaceutical Sciences 11, no. 4 (November 21, 2020): 6754–62. http://dx.doi.org/10.26452/ijrps.v11i4.3612.

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This work makes it possible to study the argan oil which has extracted by several extraction methods (artisanal, mechanical pressing of roasted almonds, mechanical pressing of unroasted almonds, solvent extraction, pulped by a goat), after extraction, a detailed Physico-chemical study was done on this oil to certify its quality, the study of this work makes it possible to achieve an official standard for argan oil and studies the influence of the extraction method and the origin of production on the chemical composition. The study shows that roasting appears as a parameter influencing the acidity value of argan oil. Analysis of the peroxide index shows that the samples of argan oil extracted by the artisanal method and that those pulped by goats have a higher peroxide content. The sterol composition as per the data in the literature. They are essentially Δ-7-stigmasterols. The main products are schottenol and spinasterol. The composition of fatty acids and sterols shows no significant variation. These results are consistent with those reported in the literature. This shows that the origin and the method of extraction do not influence the nutritional qualities of argan oil. The results for the tocopherols show that the extraction method (plump by a goat) and roasting can influence the composition of the tocopherols. On the other hand, the sample obtained by the artisanal method has a lower content of total tocopherols. Roasting decreases the total content of α-tocopherol. After this study, it is urgent to ensure the quality of this oil, so Physico-chemical analyzes were carried out to detect fraud in pure argan oil. Finally, we determined the influence of the fruit form of the argan tree (spindle-shaped, apiculate, oval, spherical) on the Physico-chemical parameters of argan oil.

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D’Aurelio Carreira, Jaine, Daniel Ângelo Macena, and Jaqueline Nascimento da Silva. "CONCENTRAÇÃO DE FÓSFORO PRESENTE NOS RECURSOS HÍDRICOS: AVALIAÇÃO DO ÍNDICE DE ESTADO TRÓFICO DO BALNEÁRIO DE QUATÁ-SP." COLLOQUIUM EXACTARUM 10, Especial (December 1, 2018): 24–28. http://dx.doi.org/10.5747/ce.2018.v10.nesp.000152.

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Water can undergo natural physico-chemical changes, but it is often caused by anthropogenic action due to improper disposal of effluent. These changes lead to eutrophication, which results in a high index of nutrients such as phosphorus and nitrogen, leading to vegetation growth. Other consequences may be fish mortality, dark water color of water, strong odor and transfer of pathogens, which endangers population health. The present work had as objective to perform analyzes of total phosphorus in the Municipal Spa of Quatá-SP. The method used for the analyzes was Phosphorus with Reactive Orthophosphate, adapted from the Standard Methods for the Examination of Water and Wastewater and the results were compared with the trophic state classes and the parameters of the legislation. At the end of the analyzes, the values obtained from EIT were considered high, compromising the quality of the water in some points.

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Silva, Jose Adailton Lima, Thais Mara Souza Pereira, Francisco José Loureiro Marinho, Vera Lucia Antunes De Lima, and Pedro Vieira de Azevedo. "PRODUCTION OF POTABLE WATER WITH THE USE OF SOLAR DESALINIZERS IN THE BRAZILIAN SEMI-ARID." Revista de Geografia 35, no. 3 (September 13, 2018): 134. http://dx.doi.org/10.51359/2238-6211.2018.230194.

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The semi-climatic conditions of the Brazilian Semi-arid have conditioned the water shortage, which has forced numerous rural families to consume brackish waters unfit for human consumption. Added to this is the fact that the poor management of local water resources is an aggravating factor to unavailability of water, especially drinking water. The technologies have proved to be medium for the efficient management of water resources. The present study aimed to analyze the use of solar desalinizers can offer drinking water with the use of solar energy. An experimental and qualiquantitative research was carried out, based: data collection; Field studies, with accounting for the production of drinking water; Conducting physical-chemical analyzes of water; And participatory research with families that consume the waters from desalinators. As result, there were: there is, locally, a great solar energy potential; There was an average production of 40 liters / day, which met the needs (2 liters / person / day) of 20 individuals distributed in 5 families; physico-chemical analyzes proved the potability of the water coming from the desalinators; And the use of desalinators has made possible socioeconomic and environmental benefits. It was concluded that desalinators are socially disseminable, economically viable, and environmentally sound technology.

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Kombienou Pocoun Damè. "Physico-chemical characterization of the soils of the watersheds of Boukombe in North-West Benin." International Journal of Science and Research Archive 1, no. 1 (November 30, 2020): 035–54. http://dx.doi.org/10.30574/ijsra.2020.1.1.0015.

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This study addresses the specificities of soils in low-income countries. These infertile soils are characterized by low levels of agricultural productivity and the disappearance of long-term fallow, which is gradually giving way to shorter-term fallow and sedentary agriculture. The overall objective was to assess the physico-chemical characteristics of the soils of the Boukombe watersheds in the north-west of Atacora in Benin. Soil studies of 15 farm sites from which soils were sampled at the [0-20] cm horizon with 30 composite samples and statistical analyzes were performed. The results of particle size analysis showed predominance (68%) of a textural dimorphism with a sandy loam character and a relatively stable structure. The soils are generally acidic (pH ≤ 5), sodium in places and poor in Organic Matter (0.3%), particularly in the plateau. Mountain lands have soils richer in OM (4%), but poor in nitrogen with a content of between [0.02-0.14%], the C / N ratio at 3% lower than 12. The contents nutrients and minerals are accumulated at the bottom of slopes (2.23% carbon, 0.14% nitrogen) and at the top of slopes (14ppm of phosphorus) under Fonio. These soils remain in a fragile state, subjecting them to the process of intense erosion. The degradation, silting up and progressive acidification of soils constitute the main constraints of agricultural production, the solution of which is based on restoring their fertility by rehabilitating dikes and removing silt.

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ИЛЬЯСЛИ, ТЕЙМУР МАМЕД, ДУНИЯ ТАЛЕХ ГАСАНОВА, and ИМИР ИЛЬЯС АЛИЕВ. "СИНТЕЗ И ИССЛЕДОВАНИЕ СТЕКЛООБРАЗОВАНИЯ В СИСТЕМЕ AS2S3-ERS." Archivarius 7, no. 5(59) (June 20, 2021): 28–31. http://dx.doi.org/10.52013/2524-0935-59-5-7.

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To determine the area of glass formation in the system As2S3-ErS were synthesized alloys in the range of concentrations 0-30 mol. % ErS. The methods of physico-chemical analysis of differential-thermal (DTA), X-ray phase (RFA), microstructural (MCA) analyzes, as well as the measurement of microhardness and density determined the area of the glass and studied them physicо-chemical propertes. It is established that in the system As2S3-ErS on the basis of As2S3 during slow cooling the area of the glass reaches 17 mol. % ErS. Alloys in the concentration range 20-30 mol. % ErS are glass-crystalline. In the system at room temperature solid solutions on the basis of As2S3 are distributed up to 2.5 mol.% ErS, and on the basis of solid solutions ErS are practically not installed.

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Pinto, Daiane dos Santos, Antônio Gilvan Rodrigues de Souza, Juliana Nascimento da Costa, Lucas Teixeira Carneiro, Mirla Dayanny Pinto Farias, and Daniele Maria Alves Teixeira Sá. "Effect of Tommy Atkins mango (Mangifera Indica) almond starch as a thickener in fish pâtés: Physicochemical and sensorial." Research, Society and Development 10, no. 3 (March 26, 2021): e54710313694. http://dx.doi.org/10.33448/rsd-v10i3.13694.

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The aim of this study was to extract the starch from the Tommy Atkins mango (Mangifera Indica) and to evaluate the effect on the chemical and physico-chemical characteristics of tilapia pâtés. Starch was extracted and total starch, protein, moisture, ash, acidity, gelling, swelling and solubility, water and oil absorption capacity, and microbiological (thermotolerant coliforms, Escherichia coli, molds and yeasts, and Staphylococcus aureus) analyzes were performed. Pâtés were formulated with mango starch and corn starch, and the pH, lipids, moisture, ash, microbiological (Thermotolerant coliforms, Escherichia Coli, Salmonella sp., Staphylococcus aureus), instrumental color, sensory and stability characteristics were analyzed during storage. The extracted material presented 72.69% total starch, 2.96% protein, gelation in concentrations of 8 to 14%, greater swelling power and solubility at 95 °C, water retention capacity of 58 g/100 g and 45 g/100g of oil. The application of mango starch in pâté did not change its physical-chemical characteristics in comparison with pâté using corn starch. There were low counts of total coliforms, molds and yeasts in the starch and an absence of Salmonella, Escherichia Coli, Staphylococcus Aureus in the starch and pâtés in the microbiological analyzes. It was found that the pâté samples were stable for 30 days of cold storage, with low color and microbiological changes. The pâtés obtained good acceptance in the sensory evaluation with scores between 7 and 8. This study showed that the application of mango starch in tilapia pâté formulations is feasible, thereby constituting a means of reusing this residue.

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Sawicka, Joanna. "Kwestia chronologii, typologii i pochodzenia szklanej biżuterii z wczesnośredniowiecznego ośrodka grodowego w Gnieźnie." Folia Praehistorica Posnaniensia 25 (December 15, 2020): 247–89. http://dx.doi.org/10.14746/fpp.2020.25.11.

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The study presents 175 artefacts from the settlement center in Gniezno – beads and rings. The materials come from settlement levels from around the mid-10th to the 13th centuries. The latest chronological findings based on 14C dating have made it possible to refine the dating, especially of the early settlement levels of the stronghold, where the vast majority of glass artefacts come from. Threeba sic groups of beads have been distinguished based on the technique of their production – beads made of a drawing a tube, the technique of winding a glass strip, as well as casting and sintering. The results of 7 physico-chemical analyzes of the glass composition (performed with the X-Ray Fluorescence, XRF method) are presented. Physicochemical analyzes of the chemical composition of the tested beads made it possible to determine the technological group and the type of glass. An attempt was made to explain the origin of the starting material (glass) for jewelery. A comparative analysis made it possible to indicate in a general manner possible manufacturers and to outline the likely directions of the influx of these glass ornaments to Gniezno.

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De la Cruz Velasco, Laura, Juliana Chamorro Mejía, and Carlos Cordoba-Cely. "Characterization Physico-chemical and mechanical of 4 vegetable fibers used as artisanal raw materials in the Department of Nariño." DYNA 88, no. 216 (February 23, 2021): 96–102. http://dx.doi.org/10.15446/dyna.v88n216.87958.

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Nowadays there is very little information about the properties of the main vegetable fibers used in artisanal production in southern Colombia. The present comparative study analyzes the physical-chemical and mechanical properties of Fique (Furcraea macrophylla), Tetera (Stromanthe stromathoides or Stromanthe jacquinii), Totora (Schoenoplectus californicus) and Iraca or Toquilla Palm (Carludovica palmata), with the intention of identifying its strengths and weaknesses like an artisan raw material. The study found that fibers with higher elasticity such as Fique can be used for items such as clothing, while stronger fibers such as Tetera can be used to create items such as baskets that require more resistance to weight and rigidity. It was also found that Iraca and Totora could be better applied in the textile industry, and that the high moisture content in all fibers can affect their technological characteristics and the quality life cycle of artisan products.

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Dimane, Fouad, Khadija Haboubi, Issam Hanafi, Abdelouahad El Himri, and Kaouthar Andaloussi. "Impact Des Facteurs De Pollution Sur La Qualite Des Eaux De La Zone Aval De La Vallee De L’oued Nekor (Al-Hoceima, Maroc)." European Scientific Journal, ESJ 13, no. 3 (January 31, 2017): 43. http://dx.doi.org/10.19044/esj.2017.v13n3p43.

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Water is a precious and essential natural resource for multiple uses. Its use for food or hygiene requires excellent physicochemical and microbiological quality. To assess the quality of well water for human consumption in the Al Hoceima region which is located in North of Morocco, a physico-chemical and bacteriological control was carried out on the basis of 10 water samples from wells in this area. The analyzes were performed on these samples by measuring the following physic-chemical parameters: temperature, pH, electric conductivity (EC), chloride (Cl -),dissolved oxygen, nitrate (NO3 -), and possibly seeking unwanted bacteria (total bacteria, total coliforms, fecal coliforms, fecal streptococci). The samples were analyzed systematically to measure all the physicochemical indicators of pollution. Correlation between pollution parameters were conducted to give a reponse element on the main causes pollution. The results performed analysis, revealed a pollution of an agricultural origin. This is confirmed by the maximum levels of chlorides, which exceed 2640 mg/l, thereby explaining the high conductivity levels (4800μs/cm). In addition 14% of analyzed wells have nitre levels 50mg/l nitrate pollution a not alarming. However, if a pollution of agricultural origin is mentioned, the lithological contribution can not be neglected on the results obtained.

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Chafaa, M., K. Naceur, Y. Omar, M. Maatoug, and M. Kharitonov. "Contamination of Ain Djenane’s water source of the city Tiaret (Algeria) by nitrates, nitrogen and phosphates." Ukrainian Journal of Ecology 7, no. 4 (December 30, 2017): 675–81. http://dx.doi.org/10.15421/2017_179.

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Several levies have been made in the groundwater of Ain Djenane of the Tiaret region (Algeria) during the period of April to May 2016 at the level of several wells located in urban areas. These levies have been the subject of analysis according to the techniques of the quality of the water assessment and the recommendations of the World Health Organization. The physical characteristics show that the water is of good quality. Very high nitrate rate has revealed with the chemical analyzes. The physico-chemical analysis has shown that studied wells have toxic substances concentrations below the WHO and national standards. It was indicated a strong contamination with nitrates (98.19±2.46 mg/l), nitrogen (18.0±3.33mg/l), phosphates (0.487±0.06 mg/l), and the contents of suspensions (851.76±18.1 mg/l), respectively. These concentrations are bigger than the standards recommended by the WHO (2006) and the standards of Algeria. The presence very high nitrates content in these waters could constitute a significant health risk to human health.

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Grigore, Nepotu, Gheorghe Romanescu, and Cristian Constantin Stoleriu. "Preliminary Monitoring of Physico-Chemical Parameters of Water Wells from the Village of Bivolari (The Moldavian Plain)." Present Environment and Sustainable Development 12, no. 2 (October 1, 2018): 93–108. http://dx.doi.org/10.2478/pesd-2018-0032.

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Abstract The main objective of the paper is focused on water quality research in the village of Bivolari, Iasi County. The Bivolari settlement is situated in the Prut meadow and develops along the road connecting Iasi and Stefanesti. The research done in this paper starts from the collection of data on water pH, water LDO (oxygen concentration), CDC (dissolved salt content) and water temperature. The parameters were measured for 7 months using the HACH-LANGE multiparameter of the Geoarchaeology Laboratory at Alexandru Ioan Cuza University of Iasi (Inter-disciplinary Platform ArheoInvest). The study is structured in two sections: scientific substantiation and applicative research. The scientific substantiation part analyzes the water features in the context of the integrated management approach as well as an analysis of the quality aspects of the water supply. The applied research part required monthly field measurements in 50 fountains (without the winter season). The approached subject is is complex and up-to-date because the citizen is a priority for EU Member States (EUPAN, 2009): the aspect of “customer satisfaction” represents a capital priority. Finally, the database is structured into two categories: spatial information such as maps; tabular information attached to spatial data. The paper also follows the transition from the field of research into the field of application by presenting models of data representation, which are at the same time tools adapted to the practical needs. In order to achieve this goal, the concept of quality (both in terms of product - drinking water and local consumer) is defined and addressed in an integrated manner. Of the 50 wells monitored, only one had a water shortage in the last 10 years, and in two other cases there were problems with household waste and dead animals that damaged the water supply. Some fountains can dry at intervals of 3-4 years.

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Siba, Amine, Samir Eljaafari, and Faouzia Mokhtari. "Pollution Bactérienne Et Toxique Dans Les Eaux Des Rejets Industriels Et Domestiques Du Littoral Atlantique (Casablanca Est- Maroc)." European Scientific Journal, ESJ 14, no. 12 (April 30, 2018): 283. http://dx.doi.org/10.19044/esj.2018.v14n12p283.

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In this work, we will focus on the assessment of the quality of the Casablanca EST coastline, including bacterial and toxic water pollution, before the realization of the SIDI BERNOUSSI pre-treatment station. For this purpose, a set of analyzes were carried out on the littoral waters to evaluate the quality of sea water. This companion of analyzes includes: Analyzes on the surface of the sea water: Physico-chemical parameters: pH, temperature, biological oxygen demand BOD 5. Undesirables substances: Nitrates (NO3-), Ammonium (NH4+), Phosphates (PO4-), Hydrocarbons. Bacteriological parameters: Faecal coliforms and faecal streptococci. Sediment Analysis: Arsenic (As), Barium (Ba), Cadmium (Cd), Total Chromium (CrT), Copper (Cu), Iron (Fe), Mercury (Hg), Lead (Pb), Selenium (Se), Zinc (Zn). Biodiversity analyzes: For algae: Arsenic (As), Cadmium (Cd), Mercury (Hg), Lead (Pb). For mussels: Cadmium (Cd), Mercury (Hg), Lead (Pb). The results showed that the waters of the east coast of Casablanca are contaminated with pollutants in this case pathogenic bacteria, toxic substances including heavy metals and other toxic substances; on the other hand, coastal biodiversity is also affected. This contamination is due to industrial activity in the area. but remains below, for most pollutants, normative limits. For bacteriological pollution, beaches AIN SEBAA and NAHLA recorded a coliform contamination and faecal streptococci exceeding the values of the Moroccan norm of bathing water.

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Popov, N. A., and N. A. Osokin. "IMPROVING ROAD MAINTENANCE MANAGEMENT PRACTICES IN RUSSIA." Strategic decisions and risk management 11, no. 3 (January 13, 2021): 304–15. http://dx.doi.org/10.17747/2618-947x-2020-3-304-315.

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The level of transport infrastructure development is one of the key determinants of economic growth. In 2018, 67.1% of all transported goods in Russia were delivered via road transport. However, Russia’s motor transport system has yet to come close to fulfilling its full potential – 57.6% of public roads do not meet regulatory maintenance requirements. The prevailing statistics highlights the task of ensuring the safety of roads. This issue is especially relevant during winter months, when the roads experience maximum climatic and physico-chemical effects. This article analyzes the road safety system of the constituent entities of the Russian Federation, considers the main regulatory documents governing the activities of road work suppliers and executive authorities in the field of road maintenance. The authors analyzed the best foreign practices in road maintenance policy. The main result of the study is the proposal to introduce a mechanism for servicing roads using a performance based contract to replace to cost based road maintenance contracts, which are the most widely applied in Russia.

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Cioroi, Maria, Elena Roxana Chiriac, and Claudia Simona Stefan. "Determination of Acidity, Total Polyphenols Content, Calcium, Magnesium and Phosphorous in Sea Buckthorn Berries." Revista de Chimie 68, no. 2 (March 15, 2017): 300–303. http://dx.doi.org/10.37358/rc.17.2.5440.

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In Romania the sea buckthorn (Hippophae rhamnoides) is prevalent naturally grown in hills territories, Meridional and Eastern Carpathians valleys from Moldavia and Muntenia and also in the Danube Delta. It is a valuable medicinal plant being a rich source of all nutrients and phytochemicals. This paper presents the results of analyzes performed on sea buckthorn berries collected from two geographical areas: Bacau and Buzau. The juice of sea buckthorn fruits, the calcined pulp and the calcined integral fruits were analysed. Physico-chemical analysis of integral sea buckthorn berries showed: pH values in the range 3.1-3.3, acidity expressed as malic acid in the range 1.97-2.02% and polyphenols content in the range 94.65 mg GAE/g d.w. and 78.33 mg GAE/g d.w., respectively. Macro elements as Ca, Mg and P were also determined. The amount of calcium in sea buckthorn fruit was found in the range 57.71 - 80 mg/100g d.w., magnesium in the range 30.56-35.61 mg/100g d.w., and phosphorus 5.34-20.56 mg/100g d.w.

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Ouaissa, Khadija, Assia Kritihi, Youness Oumessoud, Abdelaziz Maychal, and Mustapha Hasnaoui. "Effect of the self-purification of Oum Er Rbia river on the elimination of fish releases." E3S Web of Conferences 150 (2020): 02009. http://dx.doi.org/10.1051/e3sconf/202015002009.

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Fish farming is a rapidly growing production worldwide, where it covers nearly 50% of fish inputs for human consumption. Releases to the natural environment are also an important issue, especially as they are visible and quantifiable, being emitted directly into the water. The physicochemical analyzes of the various Oued Er-Rbia points (ES, P1, P2, P3 and E4) show that the physico-chemical quality of the water downstream of the OumEr-Rbia magnification station shows no signs of deterioration of the receiving releases. Fish farming effluents are known to deteriorate the quality of freshwater and the excessive presence of nitrogen and phosphorus in the water leads to eutrophication of the environment. This is not the case at the Oum Er-Rbia station, but it is crucial to develop food formulations that cause the least amount of nitrogen and phosphorus released into the environment.

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Oliveira, Ana Thaís Campos de, Fernanda Tayla de Sousa Silva, Luana Guabiraba Mendes, Antonia Lucivânia de Sousa Monte, and Antônio Belfort Dantas Cavalcante. "Physical-chemical and microbiological profile of frozen fruit pulps commercialized in Limoeiro do Norte (Ce)." Research, Society and Development 9, no. 11 (November 4, 2020): e549119473. http://dx.doi.org/10.33448/rsd-v9i11.9473.

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According to legislation for identity and quality, fruit pulp is the unfermented, non-concentrated product, the consumption of polished fruits, by an appropriate technological process with a minimum content in suspension. Objective to evaluate the quality of frozen pineapple pulps sold in Limoeiro do Norte - Ce. To do so, Physico-chemical and microbiological analyzes were carried out on four commercial pineapple flavor brands named (A, B, C and D). The characteristics analyzed were color, pH, soluble solids, titratable acidity, total sugars and vitamin C. The microbiological tests consisted of determining the probable number of molds and yeasts, total and thermotolerant coliforms and Salmonella. The data were subjected to analysis of variance and media compared by the Tukey test at 5% significance level. The results obtained indicate that the physicochemical point of view of the values found for pH, SS, acidity and sugars is the total of all analyzed brands, which are evaluated in accordance with the values recommended by the legislation, except in relation to the vitamin C content, as the values found for brand B and C are above the established limits. In the evaluation of the microbiological profile, all samples are applied within the microbiological standards RDC No. 12, of January 2, 2001, for values of coliforms and salmonella, demonstrating that they are using consumption statistics only regarding mold and yeast counts, while only the D brand was found to be within the defined standards.

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Mejraoua, Zakariae, and Nasser-Eddine Zine. "Caracterisation Physico-Chimique Du Lixiviat De La Decharge Sauvage De Meknes." European Scientific Journal, ESJ 13, no. 33 (November 30, 2017): 154. http://dx.doi.org/10.19044/esj.2017.v13n33p154.

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Solid and urban waste produced by the municipality of Meknes amounts to more than 185.103 tons annually. Since 2002 they have been transported to a landfill controlled, wild of an area of 23 hectares on the outskirts of the Commune. This discharge is unfortunately devoid of a leachate treatment device (brownish liquid effluent, produced under the combined action of rainwater and fermentation of buried waste). This study aims to make a physico-chemical characterization and evaluate the states mineral and organic of this leachate. It should be noted that this physicochemical characterization is arbitrary because this discharge will soon be equipped with a waste disposal and recovery center (CEV) using Evalixm as a treatment method. Since 2014, the company '' SUEZ ''Environment began to put in place under control this discharge. For the realization of this characterization, we carried out a series of sampling leachate from June 2014 to June 2015. During this period, the physico-chemical analyzes carried out on these samples, revealed: - low levels of nitrates (NO3 - max = 18,1 mg / L) and phosphates (PO4 3- max = 0,38mg / L) - high levels of ammonium (NH4 + max = 54,13 mg / L) and nitrites (NO 2 - , max = 27,67mg / L). This mineral concentration is translated by a high electrical conductivity which has reached a maximum value of 7.35 10 3 μS / cm. Organic pollution estimated by the pollutant load is important; the values of the Calculated DCO from 1205 to 9207 mg O2 / L with an average of 4808 mg O2 / L, those of DBO are between 53 and 386 mg O2/ L for an average of 157 mg O2 / L. The values of the ratio DBO5 / DCO oscillate between 0.01 and 0.08 with an average of 0.04. This which testifies to the anaerobic character that prevails at the level of the discharge and a probable contamination of the water table. The hydrogen variant (pH) between 6,42 and 8,99 is an annual average of 8,42 which shows that the leachate produced by the landfill is basic. The pH value shows a stagnation (8.42 and 8.23) from one year to the next, reflecting its stability and aging

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Brito, Kátia Davi, Josenildo Isidro Santos Filho, Henrique Bruno Lima, Emmanuel Paixao Neto, and Flávia Cristina dos Santos Lima. "Estudo experimental do limão Tahiti (Citrus latifólia Tanaka): composição físico-química e de minerais da polpa in natura e do resíduo albedo." Revista Principia - Divulgação Científica e Tecnológica do IFPB 1, no. 37 (December 21, 2017): 64. http://dx.doi.org/10.18265/1517-03062015v1n37p64-70.

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The present work aimed to evaluate the physical-chemical and mineral parameters of the in natura pulp and the albedo residue of the Tahiti lemon. The pulp was extracted on a stainless steel horizontal removing device and refined in a sieve with a mesh size less than 1.0 mm. The albedo residue was separated and manually dried in a kiln with forced air circulation at a temperature of 55 ± 2°C until constant mass. The physico-chemical analyzes for the pulp in natura were: total solids (TS), soluble solids (°Brix), titratable acidity (TA), pH, vitamin C, total and reducing sugars, moisture, ashes and water activity. For the dry albedo, moisture, pH, ashes, water activity, protein, reducing sugars (RS) and pectin were evaluated. The mineral constituents consisted on the evaluation of the centesimal composition of calcium (Ca), potassium (K), phosphorus (P), manganese (Mn), iron (Fe), zinc (Zn) and copper (Cu) for the in natura pulp and dry albedo residue of Tahiti lemon. Regarding the physical-chemical and mineral quality parameters, results were satisfactory. Therefore, the study of Tahiti lemon provided essential information on the availability of nutrients, so as to provide the consumer with new products derived from the Tahiti lemon and also to add economic value to the fruit.

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Santos, Norivaldo Lima, Wandrick Hauss de Sousa, Maria das Graças Cunha Gomes, Ana Sancha Malveira Batista, João Paulo de Farias Ramos, Felipe Queiroga Cartaxo, Aianne Batista Lira, and Iara Tamires Rodrigues Cavalcante. "Meat quality of suckling goat raised in differents feeding systems." Acta Scientiarum. Animal Sciences 42 (January 30, 2020): e46547. http://dx.doi.org/10.4025/actascianimsci.v42i1.46547.

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The objective of this work was to evaluate the effect of three breeding systems on the organoleptic quality and the physico-chemical composition of kids goat meat. Were used thirty newborn baby goats of 3.35 kg ± 0.65 kg crossed Parda Alpina x Undefined Race (SPRD) submitted to three breeding systems: Traditional system-TS; Intensive Feeding System without Concentrate- IS and Intensive Feeding System with Concentrate- IS+C. When the goats reached 12 kg, the animals were slaughtered and chemical and physical analyzes were performed in the evaluation of the meat and sensorial. The experimental design was completely randomized, submitted to analysis of variance and compared by the Tukey test and Ryan-Einot-Gabriel-Welsh at 5%. All analyzed variables were also submitted to Pearson correlation. The meat of the goats submitted to IS+C and IS presented higher intramuscular fat content and better flavor and aroma scores. A of Goats that used concentrated ration (TS and IS+C) showed a more intense red color in the meat than the animals that did not receive concentrate in their diets, besides presenting higher lipid contents in their composition, better scores for these two organoleptic characteristics. The chemical composition of goat meat in both breeding systems indicates that it is low in fat and high in moisture and therefore classified as very tender and juicy. The meat obtained from the IS+C, in general, presented better attributes than the others, believing it in the markets of meat of high quality.

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Berrayah, M., M. Maatoug, M. E. Azzaoui, N. Hadidja, D. T. Wendatta d’Aquin, A. Ganete, and O. V. Zhukov. "Agroecological aspect of the valorization of enriched compost household fermentable refuse production: cases of the town of Tiaret (Al." Ukrainian Journal of Ecology 7, no. 4 (December 30, 2017): 668–74. http://dx.doi.org/10.15421/2017_178.

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Composting is a process for the biological treatment of waste. This work consists of the valorization of the fermentable fraction of the household waste (FFOM) of the city of Tiaret by the production of enriched compost and its physicochemical characterization. In this context, 50 kg of selectively collected FFOM were composted by the Andean composting technique with mechanical turning and oxygen supply by aeration. Two enrichment treatments were applied. The first consists of the addition of ash on the waste to be compacted and the second, the addition of urea on the 25th day of the process. After two months of composting, the screening gave a mass of 2.06 kg of which, 4.12% of the initial mass. The physico-chemical analyzes concerned pH, electrical conductivity, salinity, moisture, dry matter, organic matter, mineral matter and total organic carbon. The enrichment treatments carried out also made it possible to improve the agronomic value of the compost from the category of organic amendments to that of organo-mineral fertilizers.

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Shamayev, A. M., and M. D. Ozersky. "Features of the influence of space factors on the changes in the optical properties of thermoregulating coatings of the «solar reflector» class." Informacionno-technologicheskij vestnik 15, no. 1 (March 30, 2018): 56–71. http://dx.doi.org/10.21499/2409-1650-2018-1-56-71.

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This article analyzes the main problems associated with the estimation of the effect of space factors on the change in the optical properties of thermoregulating coatings (TRP) of the class «solar reflector» used on modern space vehicles. It is shown that the degradation of the functional properties of TRP based on filled polymer composite materials and radiation-resistant glass K-208 under the action of space factors is caused by the formation of color centers both in the filler and in the organic binder, as well as the appearance in the glass of radiation- stimulated defects as a result of electrostatic discharges under the influence of PCF. Analysis of the results of studies of numerous works of scientists from different countries showed that at present there are no content models describing the changes in TRP properties in the space environment, taking into account the basic physico-chemical processes that determine the degradation of TRP.

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DORDZHIEV, Anatoly A., Anatoly G. DORDZHIEV, Mergen M. SANGADZHIEV, Leonid M. RUBEKO, and Victor A. ONKAEV. "Salt Composition of Clay Soils and Its Variation with Long-term Water Filtration in Republic of Kalmykia." Journal of Environmental Management and Tourism 9, no. 1 (June 23, 2018): 130. http://dx.doi.org/10.14505//jemt.v9.1(25).16.

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Knowledge of soils types in a certain area allows to predict the stability of the system. Therefore, the purpose of the work is to determine the salt composition of clayey soils and its variation with long-term water filtration, for example, the Republic of Kalmykia. For a detailed study of the topic, the authors carried out various experiments that were based on physico-chemical analyzes of samples and monoliths selected from different regions of Kalmykia. For this, water-soluble salts found in clay soils were considered. Basically, these are three groups: readily soluble, mildly soluble and hardly soluble. Chemical analyzes of chloride, sulphate and carbonate salts of sodium, potassium, magnesium and calcium were conducted on the basis of the Kalmyk State University. Separately attention was paid to the ion-exchange process and, in particular, to the transition from the solid phase to the pore solution. In connection with the strong mineralization of groundwater in the republic, the monoliths are mineralized to 10-20 g / l and in terms of chemical composition, chloride-sodium and sulfate-chloride. Calcium carbonates and gypsum are considered separately depending on the depth of the monolith. On the basis of the experiments carried out, plots of the dependence were plotted in different mineral constituents. It has been established that in gypsum and gypsum-bearing rocks the correlation coefficients for loam and sandy loam are low. The desalinization factor is more than 50%, and the desalinization is uneven in all monoliths taken from different depths. In sandy loam these parameters are lower by 20%. Separately, the parameters of exchange of mineral, disperse composition and the presence of organic substances are considered. The results will allow engineers, designers, practitioners and students to use the results in their daily work.

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Neves da Costa, Kelly Karine, Kelly Dantas Leite, Mayara Pereira de Oliveira, Ana Luiza Macedo de Araújo, and Bruno Alexandre De Araújo Sousa. "Avaliação da qualidade higiênico-sanitária e nutricional do queijo de coalho comercializado informalmente na cidade de Sousa/PB." Revista Principia - Divulgação Científica e Tecnológica do IFPB 1, no. 40 (May 25, 2018): 46. http://dx.doi.org/10.18265/1517-03062015v1n40p46-53.

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The objective of this study was to evaluate the physico-chemical and microbiological composition of the curd cheese informally sold in Sousa / PB. From May to August 2016, every 28 days, three samples from different vendors, called A, B and C, were collected so as to carry out microbiological and physicochemical analyzes. The results obtained were compared with Normative Instruction 12/2001 and IN 146/1996. Regarding total and thermotolerant coliforms, most of the samples presented did not meet the expected standards. Escherichia coli was present in all the samples, in different months, though. As for the Salmonella survey, it was only detected in the sample B of the month of August. Regarding staphylococcus aureus it was found that only samples C and B of May and June, were within the current standards of the Legislation. For the physicochemical analyzes, the pH ranged from 5.55 to 6.83; The acidity from 0.06 to 1.11%; Humidity from 35.02 to 48.93%; Ashes from 3.34 to 6.69%; Fat from 18.05 to 26.90%; The proteins from 20.97 to 26.01% and the sodium chloride from 0.78 to 2.67%. Results indicate that the samples are in disagreement when compared with the legislation, in addition to that, there were variations in the results obtained during the development of the research which shows that these products do not have any standardization and are not appropriate for human consumption.

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Concenco, Fernanda Izabel Garcia da Rocha, Rosane Nunes de Lima Gonzales, Marcia Vizzotto, and Leonardo Nora. "Manufacturing and Sensorial Acceptance of Cereal Bars Enriched with Flaxseed (Linum usitatissimum) Flour." Journal of Food Research 8, no. 1 (November 8, 2018): 1. http://dx.doi.org/10.5539/jfr.v8n1p1.

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There is increasing demand from consumers for foods with functional properties. These foods, in addition to presenting adequate nutrient levels, provide beneficial health effects thus helping to prevent numerous diseases. Among the functional foods, the flaxseed (Linum usitatissimum), belonging to the family Linaceae, is of great nutritional value. This oleaginous is rich in proteins, lipids, lignans and fibers. Consumers have preference on cereal bars for being practical, healthy and with low calorie density when proper combinations of ingredients are used. This work had as objective the production and sensorial evaluation of cereal bars enriched with flaxseed flour. Two formulations, denominated S.01 and S.02, respectively added with corresponding 5% and 10% flaxseed flour, respectively, were prepared. The physico-chemical analyzes comprised moisture and ash contents. The cereal bars were sensorially evaluated by 50 untrained testers by using the nine-point hedonic scale including attributes of flavor, texture and overall acceptance, besides intention of purchase. The averages from the sensorial evaluation were between 7 and 8, indicating, with purchasing preference of about 90%, which was considered a high acceptance rate.

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Moura, Luis Eduardo de, and Adelmo Golynski. "Critical points of industrial tomato from field to processing." Horticultura Brasileira 36, no. 4 (December 2018): 521–25. http://dx.doi.org/10.1590/s0102-053620180416.

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ABSTRACT The authors evaluated critical points of production stages of the industrial tomato, through physical and physico-chemical analyzes of U2006 hybrid fruits in the harvest, 2016. Fruits were evaluated in relation to raw material, temperature, fresh mass, pH, soluble solids (°Brix), firmness, titratable acidity and extravasation of electrolytes. Samples were collected in six steps: manual, mechanized, truck, arrival at industry, unloading and selection mat in two periods, morning and afternoon, totalizing 60 fruits for each step, and four replications. Fruits which waited for more than 10 hours in the yard generated an increase in serious defects (%), loss of fresh mass, discount on the amount paid for the load. The most critical stages of the production process were identified when tomatoes arrived at the industry and their unloading, when the fruits presented fresh mass loss due to the high temperature. In addition, the authors highlight that a better organization in the arrivals at the industry as well as an efficient communication of crop restriction is crucial, since unscheduled stops increase waiting time, causing significant quality losses.

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Ebadi, Mona, Saifullah Bullo, Kalaivani Buskaran, Mohd Zobir Hussein, Sharida Fakurazi, and Giorgia Pastorin. "Dual-Functional Iron Oxide Nanoparticles Coated with Polyvinyl Alcohol/5-Fluorouracil/Zinc-Aluminium-Layered Double Hydroxide for a Simultaneous Drug and Target Delivery System." Polymers 13, no. 6 (March 10, 2021): 855. http://dx.doi.org/10.3390/polym13060855.

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Iron oxide nanoparticles are suitable for biomedical applications owing to their ability to anchor to various active agents and drugs, unique magnetic properties, nontoxicity, and biocompatibility. In this work, the physico-chemical and magnetic properties, as well as the cytotoxicity, of Fe3O4 nanoparticles coated with a polymeric carrier and loaded with a 5-fluorouracil (5-FU) anti-cancer drug are discussed. The synthesized Fe3O4 nanoparticles were coated with polyvinyl alcohol and Zn/Al-layered double hydroxide as the drug host. The XRD, DTA/TG, and FTIR analyzes confirmed the presence of the coating layer on the surface of nanoparticles. The results showed a decrease in saturation magnetization of bare Fe3O4 nanoparticles after coating with the PVA/5FU/Zn/Al-LDH layer. In addition, the presence of the coating prevented the agglomeration of nanoparticles. Furthermore, the pseudo-second-order equation governed the kinetics of drug release. Finally, the coated nanoparticles showed stronger activity against liver cancer cells (HepG2) compared to that of the naked 5-FU drug, and displayed no cytotoxicity towards 3T3 fibroblast cell lines. The results of the present study demonstrate the potential of a nano delivery system for cancer treatment.

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Bano, Nikhat, and Ateeque Ahmad. "Groundwater Quality Assessment of Firozabad City (India) – A Physico-Chemical Analysis." International Journal of Scientific Research 3, no. 5 (June 1, 2012): 294–96. http://dx.doi.org/10.15373/22778179/may2014/90.

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Kumar, Dinesh. "Physico-Chemical Analysis of Drinking Water in Hanumangarh District, Rajasthan India." International journal of Emerging Trends in Science and Technology 03, no. 10 (October 17, 2016): 4685–94. http://dx.doi.org/10.18535/ijetst/v3i10.04.

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Oliveira, Érica Resende, Kátia Oliveira De Deus, and Márcio Caliari. "Production, characterization and acceptability of pineapple liqueurs prepared with different alcoholic bases." Revista Verde de Agroecologia e Desenvolvimento Sustentável 10, no. 1 (April 1, 2015): 108. http://dx.doi.org/10.18378/rvads.v10i1.2736.

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Evaluation of physico-chemical parameters and the acceptability of liquors pineapple (Ananas comosus L. Merri), produced with different alcoholic bases: rum, flavored with pineapple peel and rum doubly distilled grain alcohol, were performed in this study. We conducted analyzes of alcoholic strength, density, pH, soluble solids, total fixed and volatile acidity, dry, and sensory analysis through the affective test of acceptability with 100 judges using 9-point hedonic scale to evaluate the attributes color, flavor , odor and overall impression, and purchase intent test. The average alcohol content found for all treatments was 25% v / v, a value that lies within the limits of the Brazilian law. The values of dry matter, fixed acidity, density and L * is not distinguished between treatments. The color parameters L *, a *, b *, chroma and H °, and the results of the analysis of the total acidity, soluble solid showed up only statistically different for liquor-based grain alcohol. The average pH differed for rum-based liqueur. All liquors showed good acceptability, averaging above 6 and 49% of the panelists claimed that the product would probably buy pineapple liqueur made with different alcoholic bases. The liquor made of only rum was the most accepted as the global average of items analyzed.

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Nazifi, Narges, Mojtaba Tahmoorespur, Mohammad Hadi Sekhavati, Alireza Haghparast, and Mohammad Ali Behroozikhah. "Assessment of Signal Peptides to Optimize Interleukin 2 (IL-2) Folding and Expression." Current Proteomics 16, no. 3 (February 18, 2019): 188–98. http://dx.doi.org/10.2174/1570164615666181024113612.

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Background:Using a bacterial expression system such as Escherichia coli (E. coli) is very common for protein expression because of its simplicity, low cost and high efficiency.Objective:In order to express proteins that contain di-sulfide bands, an oxidative space such as the periplasmic environment of the bacteria is required. Therefore, a leader sequence which named Signal Peptide (SP) is needed to direct recombinant protein to fold in periplasmic space. Interleukin-2 (IL-2) is a prominent cytokine which known as growth factor for T-cells and typically produced by a variety of immune cells that stimulate and regulate inflammatory and immune responses.Methods:This study was designed to predict the best signal peptides to express IL-2 in E. coli. To predict the best signal peptides for the expression of IL-2 in Gram-negative bacteria (E. coli), forty-five sequences of SPs were extracted from data base. Some most important details such as n, h and c regions of signal peptides and their probability were studied through the signalP software. Afterwards, physico–chemical features of SPs were analyzed by Portparam and Solpro tools. Finally, secretion-pathway and sub-cellular localization sites were evaluated by PRED-TAT and ProtcompB softwares.Results:At the end of the in-silico analyzes, it was determined that ccmH, PelB, traU, yohN, lolA, yhcN are the most reliable SPs, respectively, with highest score and best performing to express the IL-2 protein in E. coli.

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Husen, Azis, and Ibnu Wahab Laitupa. "Analysis of the physico-chemical quality of smoked skipjack tuna during storage at room temperature using coconut shell smoke in Sasa village, South Ternate city." Agrikan: Jurnal Agribisnis Perikanan 13, no. 2 (January 8, 2021): 530–38. http://dx.doi.org/10.29239/j.agrikan.13.2.530-538.

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Fumigation of skipjack tuna in Sasa Village, South Ternate City is one of the prima donna of the fish smoking business which is very well known by the people in Sasa Village, South Ternate City in particular and in general the people of North Maluku because of the delicious and distinctive taste of fish meat so that many people buy and consume it. The curing process uses fresh skipjack fish with coconut shell fuel. The purpose of this study was to see the quality of skipjack tuna meat as quickly as possible by using coconut shells. Organoleptic observations include appearance, color, aroma, texture, appearance. The methods used in this research are descriptive, qualitative and quantitative methods. Testing of organoleptic and microbiological parameters (Total Plate Figures). The samples used for analysis were 12 tails for 8 organoleptic testing and 4 for ALT testing. The results of the research. Organoleptic testing on smoked skipjack tuna meat on the color, taste, aroma, naming, and texture of the five analyzes was still acceptable to the 27 panalis of smoked skipjack tuna produced on the first, second and third day after the third day. The third, skipjack tuna meat that has been stored has deteriorated quality and is contaminated by bacterial fungi, so the fourth, fifth and sixth day of coconut shell smoked tuna can no longer be consumed. The results of the ALT microbiology test for skipjack tuna immediately obtained the lowest value of 33.602, the second with a value of 36.006 and the third 37.505 from the test results the best bacteria with a value of 33.602.

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Dudiak, Michal, and Ladislav Dzurenda. "Changes in the Physical and Chemical Properties of Alder Wood in the Process of Thermal Treatment with Saturated Water Steam." Coatings 11, no. 8 (July 27, 2021): 898. http://dx.doi.org/10.3390/coatings11080898.

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The paper presents changes in color and selected physico-chemical properties of alder (Alnus glutinosa) wood during the process of thermal treatment of the wood with a saturated steam-air mixture or saturated water steam in the temperature range t = 95–125 °C for τ = 3 to 12 h. During the process of thermal treatment of alder wood, the original light white-gray color changes depending on the temperature and time of modification to soft reddish-brown to dark brown color shades. Color changes of alder wood expressed in the form of the total color difference are in the range of values ∆E* = 2.7–31.7. Measurements of the density of thermally treated alder wood in the dry state indicate that due to the thermal treatment of alder wood, the density decreases by ρ ≤ 4.6% compared to the average density of native alder wood. Due to the hydrolysis of hemicelluloses, in the process of thermal treatment of wet alder wood, its acidity changes in the range of values: pH = 4.9 to 3.1. Analyzes of ATR-FTIR spectroscopy indicate changes in alder wood extractants and hemicellulose degradation. A decrease in unconjugated and an increase in conjugated carbonyls was observed at all temperatures of thermal modification of alder wood. Measurements indicate changes in the lignin of alder wood and the fact that as the temperature increases, the formation of new carbonyls increases, which is reflected in the change of the chromophoric system.

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Mesboua, N., K. Benyounes, S. Kennouche, Y. Ammar, A. Benmounah, and H. Kemer. "Calcinated Bentonite as Supplementary Cementitious Materials in Cement-Based Mortar." Journal of Applied Engineering Sciences 11, no. 1 (May 1, 2021): 23–32. http://dx.doi.org/10.2478/jaes-2021-0004.

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Abstract The construction industry consumes a large quantity of cement, which therefore leads to a high CO2 emission due to the cement manufacture. The partial replacement of cement by supplementary cementations materials (SCMs) is considered as the most promising alternative to reduce the environmental impact of this industry. This investigation aims to evaluate the performance of calcinated clay (calcined bentonite at 850 °C) used as partial replacement of cement in cement-based mortar. The evaluated performances include the physico-chemical and mechanical properties, as well as microstructural characteristics.. Various characterization tests, including laser granulometry, X-ray diffraction (XRD), and X-ray fluorescence spectrometry (XRF) have been investigated. In addition, the hardened properties of different mortar mixtures were also investigated. Mortar mixtures incorporating different calcinated clay percentages corresponding to 8, 10, 12, and 14%, by mass of total binder content, were proportioned. Termogravimetric analysis (TGA) and its derivative (DTG), Differential scanning calorimetry (DSC), and microstructural (Scanning electron microscopy (SEM)) analysis were carried out on samples of mortar mixtures. Furthermore, the 28-d hardened properties were assessed to assess the pozzolanic activity of the investigated mixtures. Strength activity index (SAI), DSC, and TGA analyzes are presented. The obtained results showed that all the mixtures exhibited adequate pozzolanic activity conforming to the ASTM C618 specifications.

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Kovalchuk, Khrystyna, Halyna Ozimok, Ruslan Mariychuk, Olga Gyrka, Mykhailo Bodak, Nataliya Palko, Oksana Davydovych, Alina Tkachenko, and Liudmyla Huba. "DETERMINATION OF SAFETY INDICATORS IN THE DEVELOPED MUFFINS WITH NON-TRADITIONAL RAW MATERIALS." EUREKA: Life Sciences 4 (July 31, 2019): 28–35. http://dx.doi.org/10.21303/2504-5695.2019.00972.

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The aim of research is studying the effect of unconventional raw materials (buckwheat, oatmeal, rye, corn, milk whey, skimmed milk powder, propolis, flower pollen, bean powder, sesame oil, pumpkin seed oil, walnut oil, walnut kernels, candied fruit mixes (apple-cherry fruits of bilberries, natural honey with floral pollen, natural honey with propolis) for the quality and safety of new muffins. The article analyzes the results of the study of the quality and safety indicators of muffins of improved composition, manufactured using non-traditional raw materials. For the preparation of new types of muffins, part of the wheat flour was replaced with buckwheat, corn, oat, milk whey, skimmed milk powder and additives of vegetable origin. Margarine has been replaced by vegetable oils. It has been established that flour confectionery products have high organoleptic properties. From the physico-chemical parameters, the mass fraction of total sugar was determined, which ranged from 28.17 % to 33.07 %, the mass fraction of fat – 16.2–20.66 %, the mass fraction of moisture – 18.0–22.0, mass fraction of ash – 0.03–1.3 %, alkalinity – 0.03–1.8°, the content of toxic elements (copper, zinc, lead, cadmium, arsenic, mercury) and microbiological indicators were also determined. Based on the data obtained as a research result, the expediency of using non-traditional raw materials to expand the range of flour confectionery products, in particular muffins is substantiated.

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Jadhav, S. D., and M. S. Jadhav. "Analysis of Water Quality Using Physico-chemical Parameters of Mula-Mutha River, Pune Maharashtra." International Journal of Trend in Scientific Research and Development Volume-1, Issue-6 (October 31, 2017): 250–56. http://dx.doi.org/10.31142/ijtsrd2509.

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Journal articles on the topic 'Physico-chemical analyzes'

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