Дисертації з теми "Chemical and physicochemical properties of groundwater"
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Nilsson, Johanna. "CORRELATIONS BETWEEN PHYSICOCHEMICAL PROPERTIES IN MATERIALS COMPRISING MICROFIBRILLATED CELLULOSE : CORRELATIONS BETWEEN PHYSICOCHEMICAL PROPERTIES IN MATERIALS COMPRISING MICROFIBRILLATED CELLULOSE." Thesis, Umeå universitet, Kemiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185526.
Повний текст джерелаLapinska, Urszula. "Microfluidics and chemical kinetics to analyse protein interactions, aggregation, and physicochemical properties." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/284929.
Повний текст джерелаQi, Guangyan. "Modified soy protein based adhesives and their physicochemical properties." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/16178.
Повний текст джерелаDepartment of Grain Science and Industry
Xiuzhi Susan Sun
Soy protein is one of the most promising bio-degradable adhesives, with great potential as alternatives synthetic petroleum based adhesives for wood composite industries. However, its intrinsic drawbacks such as low water resistance, high viscosity, and short shelf life still limit its broad application. In this research, soy protein was further modified and characterized to improve adhesion properties, flow-ability, water resistance, and long shelf life, which could facilitate the industrialization of soy protein based adhesives. In this study, we exploited the in situ sodium bisulfite (NaHSO3) modification on soy protein in soy flour-water extracts, and then the modified soy protein was obtained through acid precipitation. First, different concentrations of NaHSO3 were used to modify soy flour slurry, then glycinin-rich and β-conglycinin-rich fractions were precipitated at pH 5.4 (SP 5.4) and pH 4.5 (SP 4.5), respectively. Unmodified sample SP 5.4 and SP 4.5 showed clay-like properties and viscoelastic properties, respectively; whereas with addition of NaHSO3 in range of 2-8 g/L, both SP 5.4 and SP 4.5 had the viscous cohesive phase with good handability and flow-ability. The overall adhesion performance of SP 4.5 was better than SP 5.4; the wet strength of these two fractions was in the range of 2.5-3.2 MPa compared to 1.6 MPa of control soy protein isolate. Then soy protein with various β-conglycinin/glycinin (7S/11S) ratios were extracted from soy flour slurry and characterized for adhesion properties based on the different solubility of 7S and 11S globulins. Seven glycinin-rich soy protein fractions and six β- conglycinin-rich soy protein fractions were obtained. According to the morphology, viscosity, and particle size results, we proposed that proper protein-protein interaction, hydration capacity (glycinin-rich fractions), and certain 7S/11S ratios (β-conglycinin-rich fractions) in modified soy protein are crucial to continuous protein phase formation. The viscous cohesive samples were stable for up to several months without phase separation at room temperature, with the wet adhesion strength of 2.0-2.8 MPa. The soy protein modified with NaHSO3 showed good compatibility with commercial glues applied on plywood and paper labeling fields. The modified soy protein made some functional groups, carboxylic (-COOH), hydroxyl (-OH) and amino groups (-NH2) available, which cross-linked with hydroxymethyl groups (-CH2-OH) from urea formaldehyde (UF) wood glue. The modified soy protein (MSP) with pH 4.8 also acted as an acidic catalyst for the self-polymerization of UF based resin. The wet adhesion strength of MSP/UF blends (40/60) was 6.4 MPa with 100% wood cohesive failure, as compared to 4.66 MPa of UF. As to the paper labeling application, peel strength of MSP on glass substrate increased rapidly, with curing time much shorter than commercial polyvinyl acetate based adhesives (PVAc). And the MSP/ PVAc blends showed shorter curing time, higher water resistance and lower viscosity than pure PVAc. Chemical modification could also enhance the adhesion strength of MSP. 2-octen-1- ylsuccinic anhydride (OSA) was proved to be grafted on soy protein through reaction between amine, hydroxyl groups of protein and anhydride groups. The oily nature and hydrophobic long alkyl chains of OSA mainly contributed to the significant water resistance improvement of MSP.
Tsumura, Kazunobu. "Effects of enzymatic and physicochemical treatments on the protein-chemical properties of soybean proteins." Kyoto University, 2005. http://hdl.handle.net/2433/145442.
Повний текст джерела0048
新制・論文博士
博士(農学)
乙第11587号
論農博第2547号
新制||農||903(附属図書館)
学位論文||H17||N3991(農学部図書室)
22886
UT51-2004-U484
(主査)教授 井上 國世, 教授 安達 修二, 教授 伏木 亨
学位規則第4条第2項該当
Saban, Waheed. "Synthesis, characterization and physicochemical properties of platinum naboparticles on ordered mesoporous carbon." Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8474_1320738516.
Повний текст джерелаTadanier, Christopher J. "Influence of Operational Characterization Methods on DOM Physicochemical Properties and Reactivity with Aqueous Chlorine." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/40503.
Повний текст джерелаPh. D.
Lan, Zhongming. "Linking Key Properties of Biochar to Nitrous Oxide Emission in Soil: Chemical and Molecular Mechanisms." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/365271.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Vertuan, Gislene Cristina. "Evaluation of physicochemical properties of a new epoxy resinbased root canal sealer." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-23012019-164028/.
Повний текст джерелаIntrodução: Este estudo objetivou avaliar algumas propriedades físico-químicas de um novo cimento obturador de canais radiculares. Metodologia: Para os testes de radiopacidade, escoamento, solubilidade e confecção dos corpos de prova para os tempos de presa foram seguidas as especificações nº57 da ANSI/ADA (2000) e ISO 6876 (2012). Para a medição dos tempos de presa, inicial e final, foi empregada a norma ASTM C266/2008. O pH foi avaliado nos períodos de 3, 24, 72 e 168 horas. Sobre os resultados foram aplicados testes estatísticos com nível de significância de 5%. Resultados: Os resultados demonstraram que o cimento Sealer Plus apresentou menor radiopacidade do que o cimento AH Plus (p<0.05), porém, superior ao mínimo recomendado pelas especificações, ou seja, de 3 mm de Al. Com relação ao escoamento, o do Sealer Plus foi 19,19 mm e do AH Plus 19,81 mm (p>0.05). O Sealer Plus apresentou tempos de presa inicial e final de 138 min. e 210 min., respectivamente, enquanto o AH Plus, 437 min. e 849 min., respectivamente, (p<0.05). Em relação à solubilidade, o Sealer Plus apresentou 0,21% e o AH Plus 0,27% (p>0.05). Nenhum dos cimentos apresentou aumento significativo do pH (p>0.05). Conclusão: O cimento Sealer Plus apresentou propriedades físico-químicas de acordo com as especificações nº 57 da ANSI/ADA (2000) e ISO 6876 (2012).
Shingler, Taylor, and Taylor Shingler. "Investigations of Physicochemical Properties of Size-Resolved, Subsaturated, Atmospheric Aerosol Particles: Instrument Development, Field Measurements, and Data Analysis." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620958.
Повний текст джерелаQueiroz, Marcela Borsatto. "Physicochemical and biological properties of tricalcium silicate-based reparative materials with alternative radiopacifiers and Biosilicate /." Araraquara, 2018. http://hdl.handle.net/11449/153908.
Повний текст джерелаAbstract: Tricalcium silicate cements associated with radiopacifiers are used as repair materials. Publication 1: Evaluation of tricalcium silicate-based cements (TCS) associated with zirconium oxide (ZrO2), calcium tungstate (CaWO4) or niobium oxide (Nb2O5) radiopacifiers compared to MTA Repair HP (MTA HP). Publication 2: Evaluation of tricalcium silicate-based cements (TCS) associated with zirconium oxide (ZrO2) radiopacifier with 10% or 20% of Biosilicate (TCS ZrO2 + 10% Biosilicate and TCS ZrO2 + 20% Biosilicate) compared to Biodentine. Setting Time (ST) and radiopacity were evaluated based on ISO 6876/2002 standard. Solubility was evaluated according to the method proposed by Carvalho-Júnior et al. (2007) modified. pH was measured at 3, 12 and 24 hours and 7, 14 and 21 days after immersion in distilled water. Cellular cytotoxicity and bioactivity were evaluated by methyltetrazolium (MTT), neutral red (NR), alkaline phosphatase (ALP), alizarin red (ARS) and real time PCR (qPCR) (Publication 1) assays in different periods of contact with eluates of the materials in Saos-2 cells. Antibacterial activity was evaluated by direct contact on Enterococcus faecalis in the planktonic form. For the physico-chemical and ARS tests, the data were submitted to ANOVA and Tukey tests; for MTT, NR and ALP tests the data were analyzed by the Two-Way ANOVA and Bonferroni tests; the antibacterial activity, were submitted to Kruskall-Wallis and Dunn tests (α = 0.05). Publication 1: TCS + CaWO4 presented... (Complete abstract click electronic access below)
Resumo: Cimentos de silicato tricálcico com radiopacificadores são utilizados como materiais reparadores. Publicação 1: Avaliação de cimento à base de silicato tricálcico (STC) associado aos radiopacificadores óxido de zircônio (ZrO2), tungstato de cálcio (CaWO4) ou óxido de nióbio (Nb2O5) em comparação ao MTA Repair HP (MTA HP). Publicação 2: Avaliação de material à base de silicato tricálcico (STC) e radiopacificador óxido de zircônio (ZrO2) e 10% ou 20% de Biosilicato (STC ZrO2 + 10% de Biosilicato e STC ZrO2 + 20% de Biosilicato) em comparação ao Biodentine. Tempo de presa e a radiopacidade foram avaliados seguindo ISO 6876/2002. A solubilidade foi avaliada de acordo com o método proposto por Carvalho-Júnior et al. (2007) modificado. pH foi avaliado 3, 12 e 24 horas, 7, 14 e 21 dias após imersão em água destilada. A citotoxidade e bioatividade celular foram avaliadas pelos testes metiltetrazólio (MTT), vermelho neutro (VN), atividade de fosfatase alcalina (ALP), ensaio de vermelho de alizarina (ARS) e PCR em tempo real (qPCR) (Publicação1), em diferentes períodos de contato com eluídos dos materiais em células Saos-2. Atividade antimicrobiana dos materiais foi avaliada por meio do teste de contato direto com Enterococcus faecalis na forma planctônica. Para os testes físicoquímicos e ARS, os dados foram submetidos aos testes ANOVA e Tukey; para os ensaios do MTT, VN e ALP e qPCR os dados foram analisados aos testes Two Way ANOVA e Bonferroni; os dados da atividade antimicrobiana f... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Degaga, Gemechis D. "Physicochemical, Spectroscopic Properties, and Diffusion Mechanisms of Small Hydrocarbon Molecules in MOF-74-Mg/Zn| A Quantum Chemical Investigation." Thesis, Michigan Technological University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10791501.
Повний текст джерелаIn petroleum refining industries, the fracturing process allows for the cracking of long-chain hydrocarbons into a mixture of small olefin and paraffin molecules that are then separated via the energetically and monetarily demanding cryogenic distillation process. In an attempt to mitigate both energetic and capital consumptions, selective sorption of light hydrocarbons by tunable sorbents, such as metal-organic frameworks (MOFs), appears to be the most promising alternative for a more efficient gas separation process. MOFs are novel porous materials assembled from inorganic bricks connected by organic linkers. From a crystal engineering stand point, MOFs are advantageous in creating a range of microporous (0.2–2.0 nm) to mesoporous (>50 nm) void cavities, presenting unique opportunities for the functionalization of both the organic linkers and the void. Of significant importance is the MOF-74-M family (M = metal), characterized by a high density of open metal sites, that is not fully coordinated metal centers. This family of MOF is also known as CPO-27-M. MOF-74 have demonstrated more separation potential than other known MOFs and zeolites. Density functional theory (DFT), as implemented within a linear combination of atomic orbital (LCAO) approach, has been used to investigate the selective sorption of C1-C4 hydrocarbons in MOF-74-Mg/Zn. The study was first implemented by adopting a molecular cluster approach, and later by applying periodic boundary conditions (PBC). While both modellistic approaches agree in showing significant differences in binding energies between olefins and paraffins adsorbed at the MOFs’ open metal sites, results reported at the molecular cluster level show underestimation when compared to those obtained at the PBC level. The use of PBC models allow for the correcting of binding energies for basis set superposition error (BSSE), molecular lateral interaction (LI), zero-point energy (ZPE), and thermal energy (TE) contributions. As such, results obtained at the PBC level are directly comparable to experimental calorimetric values (i.e., heat of adsorptions). This work discusses, for the first time, the origin of the fictitious agreement between binding energies obtained with molecular clusters and experimental heats of adsorption, identifying its origin as due to compensation of errors. Spectroscopy studies based on the intensities and frequency shifts with respect to the molecules in the gas phase are presented as a further investigation of the interaction of the small hydrocarbons (C1-C 2) with the open metal sites in MOF-74-Mg. In an attempt to provide a more comprehensive description of the behavior of the hydrocarbon molecules, results from diffusion mechanism studies are also presented. The investigations of the diffusion mechanisms are based on the use of climbing-image nudge elastic band (CI-NEB) simulations, coupled with van der Waals functional (vdW-DF) and ultra-soft pseudopotentials as implemented within the plane-wave (PW) DFT approach. The CI-NEB studies showed that paraffin molecules are more energetically favored to diffuse within and along the cavity of MOF-74-Mg with respect to their olefin counterparts.
Howard, Melissa. "EVALUATION OF THE PHYSICOCHEMICAL PROPERTIES AND STABILITY OF SOLID LIPID NANOPARTICLES DESIGNED FOR THE DELIVERY OF DEXAMETHASONE TO TUMORS." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/806.
Повний текст джерелаHorta, Madalena Nunes França Aires. "Does community scale composting produce a viable outcome? Some physical and chemical properties of green waste composts produced in the Faculty of Sciences campus." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/29387.
Повний текст джерелаSantos, Mickael da Costa. "Study of the influence of high hydrostatic pressure on wine chemical and sensorial characteristics." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14822.
Повний текст джерелаDuring the last years, the use of high hydrostatic pressure (HHP) as a non-thermal technology for preservation or aging of wine has increased substantially in the academic community. However, HHP treated wine has been only analysed after the pressure treatment, with no knowledge available on the effects of HHP during subsequent storage. The results presented in this thesis showed that HHP treatments influence the chemical and sensorial properties of wine during storage. The application of high hydrostatic pressure treatments in winemaking for wine preservation, as an alternative to sulphur dioxide, was evaluated studying the effect of HHP in the physicochemical and sensorial properties of red and white wines during bottle storage. High pressure treatments with 5 min of processing time and pressures of 425 and 500 MPa were shown to influence on both red and white wine physicochemical and sensorial characteristics. However, the effects were only perceptible after, at least, 6 months of storage. The alterations that occurred on the pressurized red wine characteristics, such as the more orange-red colour and the lower antioxidant activity (15-27% less), total phenolic content (9% less), and anthocyanins content (45–61% less), were due to an increase of condensation reactions of phenolic compounds. The increase of these condensation reactions lead to the formation of compounds with higher degree of polymerisation that became insoluble along storage, increasing consequently the amount of wine deposits in the pressurized wines. In terms of white wines, pressurized wines showed, after one year of storage, a more brownish colour and a lower antioxidant activity (15% less) and total content of phenolic compounds (10% less) when compared to the unpressurized wines. These results, together with the lower content of free amino acids (15-20% less) and higher content of furans (up to 70% more), present in the pressurized wines after nine months of storage, led to propose an effect of HHP treatments in the acceleration of Maillard reactions that occur during the wine storage period. Therefore, contrary to the pressurized sulphur dioxide-free red wine, the pressurized white wines were not considered suitable for commercialization as table wines due to the higher brownish colour and cooked fruit aroma, characteristics of an aged or thermally treated wine.Additionally, the impact of the pressure treatments on the volatile composition of sulphur dioxide-free red and white wines, during bottle storage, was evaluated. More than 160 volatile compounds, distributed by 12 chemical groups, were identified in both wines. At the end of storage, the pressurized wines presented a higher content of furans, aldehydes, ketones, and acetals when compared to the unpressurized wines. These results indicate that pressure influences the white and red wine long term volatile composition, being this particularly evident for longer storage periods. The changes on the volatile composition of the pressurized wines, indicated that the HHP treatments accelerate the Maillard reactions, and the oxidation of alcohols and fatty acids, leading to wines with a volatile composition network approaching the characteristic of faster aged and/or thermally treated wines. The acceleration of Maillard reactions and phenolic compounds condensation by HHP treatments was also studied in model wine solutions (hydro alcoholic solution at acidic pH). The results showed that the high pressure treatment accelerated the Maillard reaction and this effect was quantifiable, mainly, after 6 months of storage. Pressurized model solutions presented higher concentration of 2-furfural, phenylacetaldehyde and benzaldehyde, when compared to the controls. In terms of phenolic compounds condensation reactions, the pressurized model wine solutions showed no relevant differences, when compared to controls. Therefore, it seems that the pressure treatment had a higher impact in terms of kineticks of reactions and in less extent in terms of different compounds formed. Lastly, the application of HHP treatments in winemaking to improve the properties of young wines was evaluated. For this propose, the effect of HHP treatments in the phenolic composition of a red wine was studied and compared with the effect of different oenological practices. Wines pressurized at 500 MPa for 5 min, and 600 MPa for 20 min, at 20 ºC, showed, after 5 months of storage, a lower monomeric anthocyanins (8-14%), phenolic acids (8-11%) and flavonols (14-22%) content, when compared to the unpressurized ones. The wine pressurized at 500 MPa presented a flavanols content and a degree of polymerization very similar to the wines treated by traditional aging processes. In terms of sensorial properties, the pressure treatments increased the cooked fruit aroma and decreased the floral and fruit odours and, in the case of the 600 MPa treatment, increased the bitterness. Therefore, the HHP treatments seem to promote reactions that are similar to those observed in wines treated with wood aging processes. In conclusion, the results presented in this thesis showed that HHP treatments accelerated the Maillard reaction and the polymerization reactions between phenolic compounds present in the wine, influencing the chemical and sensorial properties of wine. HHP can be potentially used to preserve or accelerate the wine aging process, producing wines with pleasant and distinct characteristics.
Durante os últimos anos, o uso de alta pressão hidrostática (APH) como tecnologia não-térmica para a preservação ou envelhecimento de vinho tem aumentado substancialmente na comunidade académica. No entanto, os vinhos tratados por APH têm sido analisados após o tratamento de pressão, não havendo referências sobre as suas propriedades durante o armazenamento. Os resultados apresentados nesta tese mostram que a aplicação de tratamentos de APH altera as propriedades químicas e sensoriais de vinhos ao longo do armazenamento. Os tratamentos de alta pressão hidrostática foram aplicados na vinificação para a preservação de vinho, como alternativa ao dióxido de enxofre, sendo o seu efeito avaliado nas propriedades físico-químicas e sensoriais de vinhos tintos e brancos durante o armazenamento em garrafa. Os tratamentos de alta pressão com 5 min de processamento e pressões de 425 e 500 MPa mostraram influenciar as características físico-químicas e sensoriais de vinhos tintos e brancos. No entanto, o efeito foi apenas percetível após pelo menos 6 meses de armazenamento. As alterações que ocorreram nas características do vinho tinto pressurizado, tais como a cor mais laranja-vermelho, menor atividade antioxidante (menos 15 a 27%), menor conteúdo de compostos fenólicos totais (menos 9%) e menor teor de antocianinas (menos 45-61%), foram devidas a um aumento das reacções de condensação de compostos fenólicos. O aumento destas reações de condensação levou à formação de compostos com maior grau de polimerização que se tornaram insolúveis no vinho ao longo do armazenamento, aumentando consequentemente a quantidade de depósito nos vinhos pressurizados. Em relação ao vinho branco, os vinhos pressurizados mostraram, depois de um ano de armazenamento, uma cor mais acastanhada, menor atividade antioxidante (menos 15%) e menor teor de compostos fenólicos totais (menos 10%) comparando com os vinhos não pressurizados. Estes resultados, juntamente com o baixo teor de aminoácidos livres (menos 15 a 20%) e um maior teor de furanos (até 70% mais) para os vinhos pressurizados após nove meses de armazenamento, levam a propor que os tratamentos de APH aceleraram as reações de Maillard que ocorrem durante o período de armazenamento do vinho. No entanto, ao contrário dos vinhos tintos pressurizados, os vinho brancos pressurizados não foram considerados adequados para comercialização como vinhos de mesa, visto que apresentavam uma cor acastanhada e um elevado aroma a fruta cozida, características estas de vinhos envelhecidos ou tratados termicamente.Adicionalmente, foi avaliado o impacto dos tratamentos de APH sobre a composição volátil dos vinhos tintos e brancos sem dióxido de enxofre durante o armazenamento em garrafas. Mais de 160 compostos voláteis, distribuídos por 12 grupos químicos, foram identificados em ambos os vinhos. No final do armazenamento, os vinhos pressurizados apresentaram um teor mais elevado de furanos, aldeídos, cetonas e acetais quando comparados com os vinhos não pressurizados. Estes resultados indicam que os tratamentos de APH influenciam a composição volátil de vinhos brancos e tintos, , sendo mais evidente em longos períodos de armazenamento. As mudanças na composição volátil dos vinhos indicaram que os tratamentos de APH aceleraram as reações de Maillard e também a oxidação de álcoois e ácidos gordos, originando vinhos com uma composição volátil próxima de vinhos com envelhecimento acelerado ou tratados termicamente. A aceleração das reações de Maillard e de polimerização dos compostos fénolicos causada pelos tratamentos de APH foi também estudada em soluções modelo de vinho (solução hidroalcoólica com pH ácido). Os resultados mostraram que o tratamento de APH acelera a reação de Maillard , sendo este efeito quantificado, apenas, após 6 meses de armazenamento. As soluções modelo de vinho pressurizadas apresentaram concentrações mais elevadas de 2-furfuraldeído, fenilacetaldeído e benzaldeído, em comparação com os controlos. Em termos de polimerização dos compostos fénolicos, as soluções modelo pressurizadas não apresentaram diferenças relevantes, em comparação com os controlos. Por conseguinte, os tratamentos de APH aparentem ter mais impacto em termos de modificações nas cineticas de reação do que na formação de novos compostos. Por último, a aplicação de tratamentos de APH foi estudada para melhorar as propriedades de vinhos jovens. Para este propósito, o efeito de tratamentos de APH na composição fenólica de um vinho tinto foi estudado e comparado com o efeito de diferentes práticas enológicas. Vinhos pressurizados a 500 MPa durante 5 min e a 600 MPa durante 20 min, a 20 ºC, mostraram depois de 5 meses de armazenamento um menor teor de antocianinas monoméricas (8-14%), ácidos fenólicos (8-11%) e flavonóis (14 -22%), quando comparados com os vinhos não-pressurizados. O vinho pressurizado a 500 MPa apresentou um teor de flavonóis e um grau de polimerização de taninos muito semelhante aos vinhos tratados por processos de envelhecimento tradicionais. Em termos de propriedades sensoriais, os tratamentos de pressão aumentaram o aroma de fruta cozida e diminuiram os aromas florais e frutados, tendo no caso do tratamento de 600 MPa sido verificado também um aumento da amargura. Assim sendo, os tratamentos de APH parecem promover reações que são semelhantes às observadas em vinhos tratados com processos de envelhecimento em madeira. Em conclusão, os resultados apresentados nesta tese mostram que a aplicação de tratamentos de APH acelera as reações de Maillard e a polimerização dos compostos fenólicos presentes no vinho, ao longo do armazenamento, alterando assim as propriedades químicas e sensoriais dos vinhos. A APH pode ser potencialmente utilizada para preservar ou acelerar o processo de envelhecimento de vinho tinto produzindo vinhos com características agradáveis e distintas.
Belghiti, Alaoui Abderrahim. "Nature des polysaccharides issus du process d'extraction du saccharose à partir de la betterave." Vandoeuvre-les-Nancy, INPL, 1993. http://docnum.univ-lorraine.fr/public/INPL_T_1993_BELGHITI_ALAOUI_A.pdf.
Повний текст джерелаSoares, Fabiana Andreia Schafer de Martini. "Efeito da interesterificação química sobre as propriedades físico-químicas de misturas de estearina e oleína de palma." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/9/9133/tde-10032010-100042/.
Повний текст джерелаThe challenge of the food industries for the replacement of trans fat in various products lies in the development of formulations and processes which have equivalent functionality and economic viability. The chemical interesterification of palm stearin and palm olein is an important technological option for the production of fats targeting commercial applications, without formation of trans fatty acids Palm oil contains similar amounts of saturated and unsaturated fatty acids. After fractionation two fractions are obtained: stearin (solid fraction) and olein (liquid fraction). Palm stearin and palm olein are alternatives for the production of many products, such as margarines and shortenings. The objective of this work was to modify the physical and chemical properties of mixtures of palm stearin and palm olein by using chemical interesterification. The following properties were analyzed: fatty acid and triacylglycerol compositions, regiospecific distribution of fatty acids in triacylglycerols, iodine value, softening and melting points, solid fat content, consistency and crystal microstructure. Saturated fatty acids are predominant in palm stearin (71.9%), which corresponds to 65.5% of palmitic acid. Palm olein has as its main constituent the oleic acid, which represents 45.4% of the unsaturated fatty acids. The increase of the proportion of palm olein in the mixture causes increase on the amount of unsaturated fatty acids and iodine value and decrease on the content of saturated fatty acids. After chemical interesterification, melting and softening points, consistency and solid fat content increased in the blends that had higher proportion of palm olein, as a consequence of the increase in the trisaturated triacylglycerols. On the other hand, these properties did not alter in the blends with higher proportion of palm stearin. This behavior is due to the random distribution of fatty acids in triacylglycerols after interesterification, which forms triacylglycerols in proportions that are different from those originally present. The major triacylglycerols in the blends were PPP, PPO and POO. Before interesterification the saturated fatty acids were found mainly in the sn-1,3 positions. Significant changes in the fatty acid composition in the sn-2 position after chemical interesterification were found in blends with more than 60 % of palm olein. Blending and interesterification of fats resulted in structured lipids with different degrees of plasticity, increasing the possibilities of use of stearin and olein fractions.
Servant, Sylvie. "Variabilité des propriétés physico-chimiques d'exsudats d'Acacia senegal (gomme arabique) d'une plantation expérimentale au Ferlo (Sénégal). Modification des chaînes." Rouen, 1994. http://www.theses.fr/1994ROUES045.
Повний текст джерелаQuisefit, Jean-Paul. "Physico-chimie de l'aerosol volcanique : modelisation thermochimique du refroidissement des emanations de haute temperature." Paris 7, 1988. http://www.theses.fr/1988PA077143.
Повний текст джерелаBernhard-Bitaud, Corinne. "Modifications de la matière organique et conséquences sur l'adsorption de l'atrazine dans un sol brun de prairie mis en culture." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL128N.
Повний текст джерелаMollard, Claire. "Modèles pour l'étude de l'assimilation du fer par les bactéries et les plantes : sidérophores abiotiques et processus d'échange." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10295.
Повний текст джерелаLenormand-Foucaut, Alix. "Modélisation chimique de protéines fer-soufre à haut potentiel : synthèses et caractérisations physico-chimiques de nouveaux agrégats à ligands thiolates encombrés dans les états (4Fe-4S)2+ et (4Fe-4S)3+." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10056.
Повний текст джерелаDavid, Hélène. "Etude de matrices polymères permettant la libération contrôlée d'agents actifs en agriculture : expérimentation et modélisation des transferts de matière." Saint-Etienne, 1989. http://www.theses.fr/1989STET4004.
Повний текст джерелаConnolly, Siobhan. "Etude biochimique et physicochimique de gommes végétales exsudées par Acacia senegal et Combretum nigricans." Rouen, 1988. http://www.theses.fr/1988ROUES005.
Повний текст джерелаForestier, Christiane. "Facteurs de virulence d'escherichia coli isoles de selles diarrheiques : mise en evidence et caracterisation d'une adhesine non filamenteuse." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF21047.
Повний текст джерелаSingh, Satyendra. "Concentration and removal of arsenic using sulfate reducing bacteria (SRB)." Thesis, 2016. http://localhost:8080/xmlui/handle/12345678/7118.
Повний текст джерела"Evaluation of physicochemical properties of a pulmonary surfactant analogue." Tulane University, 1999.
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Weiss, Jochen. "Effect of mass transport processes on physicochemical properties of surfactant -stabilized emulsions." 1999. https://scholarworks.umass.edu/dissertations/AAI9950218.
Повний текст джерелаCheng, Yu-Che, and 鄭宇哲. "Analyses of Internal Physicochemical Properties of Tomatoes and Bananas Using Chemical Shift Imaging." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02854685642717737389.
Повний текст джерела臺灣大學
生物產業機電工程學研究所
98
This study developed an analytical method to detect the spatial changes of sugar and lycopene content in tomatoes and sugar content in bananas during ripening process by using CSI technique. An algorithm was developed to correct the image artifact due to field inhomogeneity, and thus to visualize the internal spatial distribution of sugar and lycopene content of the same tomatoes and sugar content of bananas before and after ripening. The experiments were performed to acquire tomato images with the same imaging parameters at mature green and red ripe stages and banana images on different days after ethylene treatment. The spatial distribution of sugar and lycopene content in tomatoes and sugar content in bananas were compared before and after ripening process. After comparing the maximum PSNR, SNR, and linewidth of water phantom in 3T and 7T CSI data with the same imaging parameters, we found the imaging indexes in 7T CSI -- the maximum PSNR 3371, the maximum SNR 810, and the maximum linewidth 0.214 ppm -- are almost twice those in 3T CSI. This demostrates that CSI image quality in 7T is better than in 3T. On the other hand, when comparing the concentration of sugar solutions and CSI intensity, we found that a linear relationship exists between them. Using the linear relationship, the sugar content of tomatoes and bananas was quantitatively analyzed. After comparing the sugar content and lycopene content in a tomato with CSI and HPLC analyses, the sugar content was found to have slightly decreased, and the lycopene content had increased after ripening process. We further compared the sugar content in bananas using CSI and HPLC analyses. The sugar content in the pulp quickly increased during the first 4 days after ethylene treatment, and there were little change in the peel. In this study, results from the CSI analyses of sugar and lycopene in tomato or banana fruits were consistent with that of the HPLC analyses. Therefore, the non-destructive CSI technique may become an efficient tool for physiological analyses in the future.
Rajabzadeh, Amin Reza. "Membrane Fouling During Hollow Fiber Ultrafiltration of Protein Solutions: Computational Fluid Modeling and Physicochemical Properties." Thesis, 2010. http://hdl.handle.net/10012/5786.
Повний текст джерелаSkorepova, Jana. "Effect of Electroacidification on Ultrafiltration Performance and Physicochemical Properties of Soy Protein Extracts." Thesis, 2007. http://hdl.handle.net/10012/3474.
Повний текст джерелаHu, Chang-da, and 胡長達. "Studies on the Chemical Composition, Physicochemical Properties and Antioxidant Activities of Germinated Brown Rice by Different Treatments." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/03524584612847263123.
Повний текст джерела"FLAXSEED (Linum usitatissimum L.) GUM AND ITS DERIVATIVES: PHYSICOCHEMICAL PROPERTIES AND POTENTIAL INTERACTIONS WITH FOOD MACROMOLECULES." Thesis, 2016. http://hdl.handle.net/10388/ETD-2016-04-2513.
Повний текст джерелаChang, Kai-Ming, and 張凱銘. "Studies on the difference of chemical compositions and physicochemical properties of wet milled rice flours by centrifugal dehydration." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/73616424233906254259.
Повний текст джерела國立中興大學
食品科學系
89
Two waxy rice varieties, Tai Gang Waxy 1(TGW1) and Taichung Waxy 70(TCW 70), and one non-waxy high amylose rice variety, Tainung Sen 17(TnuS17), of second crop of 1999 were used as test samples. Centrifugal filtration was used to investigate the difference in physicochemical properties of wet-milled rice flours. The eating qualities of it’s rice cakes were also examined. Centrifuge dehydration, it performed three layers of filter cake with different color after centrifuging. The data showed that there were differences in particle size and leached out amount of rice flour between different layers. Rice flour which located in the inside-layer showed highest protein, ash and fat content, highest amylase activity and lowest viscosity, white index and enthalpy(ΔH). Rice flour which located in the intermediate-layer showed lowest amylase activity, protein, ash and fat content and highest viscosity, white index and enthalpy(ΔH). In rice flour products, the physical properties of nein-kau, the results found that nein-kau prepared by inside layer had lowest value in springiness, cohesiveness and chewness. Nein-kau prepared by outside layer showed highest springiness, cohesiveness and chewness. Concerning the eating quality of rice cup cake, rice cup cake prepared by different layers of TNuS17 also showed differences in texture. Rice cup cake prepared by inside layer showed lowest hardness, adhesiveness and chewness. Rice cup cake prepared by outside layer showed highest hardness, adhesiveness and chewness.
Arendze, Shakera. "The effect of trees on physical and chemical properties of substrata contaminated by gold mine waste disposal." Thesis, 2015. http://hdl.handle.net/10539/18548.
Повний текст джерелаUnable to load abstract
Lin, Guan-Yu, and 林冠宇. "A study on soil and groundwater chemical properties of chromium and nickel high pollution risk areas derived from serpentine in Hualien." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/t28j4t.
Повний текст джерела國立宜蘭大學
環境工程學系碩士班
103
In eastern Taiwan, serpentine is generally founded because of collision accompanied by volcanic activity. Such topography after weathering, easy to form a high chromium and nickel content of the soil. As a result, there are some places chromium(VI) concentration will exceeds the control standard for drinking water (50 μg/L) by the WHO. This study is aim at chromium and nickel high risk potential areas in Hualien where demonstrated by EPA for investigation to soil and groundwater chemical properties, and established a background content of chromium and nickel in soil to clarify the study area for hazardous environment of chromium and nickel as according to the study area in the future use. This study selected a region of chromium and nickel high risk potential area in Hualien, and chose three soil from Wanrong village and twenty four soil from Zhangqiao village with chemical properties of chromium and nickel. We also selected eighteen samples drilling by collection of soil from Hualien EPB set a groundwater monitoring well at Zhuoqing Elementary School as this research soil geological chemical properties reference compared. Experimental results indicated that three of soil samples from Wanrong village with total Ca/Mg ratio is much lower than 1.0 and Cr and Ni concentrations were consistent with EPA findings. There are five of soils selected of six soils by XRF screen from Zhangqiao village with total ratio is much lower than 1.0 that confirm characteristics of serpentine soil, and total Cr and Ni are consistent with the soil pollution control standards but some of sample concentration slightly higher than the natural content of heavy metals of farmland in Taiwan. This shows there is no worry of Cr and Ni contamination that effected smaller by serpentine in Zhangqiao village. There are some soils that concentration of total Cr and Ni are much higher than the soil pollution control standards in Zhuoqing Elementary School. There is a characteristic with soil derived from serpentine that is total Ca/Mg ratio will decrease when the concentration to rise of total Cr and Ni. The soils in study with sequence extraction method can be divided into exchangeable form, carbonate bonding form, iron and manganese oxide bonding form, organic bonding form, and residual form five species distribution type. The results indicated that the chemical form of chromium in soils mainly in residual form (at least 85%). Nickel can be found outside of the percentage of residual form is up to 50%, this result indicating that the mobility and harmfulness of Ni are more dangerous than Cr. This study conduct water quality statistics and simulation of groundwater chemical models with groundwater monitoring stations water quality investigate data and clarifying effect with high Cr and Ni content of heavy metals in soil to groundwater. The Piper diagram indicates that in most part of study area, the chemical character of water is dominated by two types, Ca-HCO3 and Mg-HCO3. The groundwater chemistry simulation results show that the study area of nickel mineral will not precipitation showed with saturation index is much less than 0 and chromium mineral will precipitation showed with saturation index is greater than 0 and sedimentation were mainly of Cr2O3.
Rekapalli, Monica. "Role of Physico-chemical Processes And Micro-structural Features in Influencing Moisture Loss and Engineering Properties Of Compacted Residual Soils Exposed To Environmental Relative Humidity." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5070.
Повний текст джерелаJerzak, Magdalena. "OCENA WPŁYWU PASTERSTWA NA CHEMIZM I STAN SANITARNO-BAKTERIOLOGICZNY WÓD PODZIEMNYCH W REJONIE PIENIN." Doctoral thesis, 2020. https://depotuw.ceon.pl/handle/item/3647.
Повний текст джерелаThe purpose of the research carried out from 2012 to 2015 was to assess the influence of grazing on the physicochemical properties and the sanitary and bacteriological condition of groundwater in the vicinity of sheep pastures located in Pieniny and Beskid Sądecki region in southern Poland. In the Pieniny region, many scientific works were carried out in the field of natural sciences, including geological and hydrogeological, covering studies on the influence of sheep grazing on vegetation, animals, soils and surface waters. However, no detailed diagnosis has yet been made to determine the influence of sheep grazing on groundwater quality. The research covered ten research areas located in the Pieniny Klippen Belt and the outer Flysch Carpathians, each differing in the intensity of sheep grazing. A total of 25 springs were selected for the study, which were subjected to systematic periodic tests conducted in three research seasons: spring, summer and autumn. Seasonal field investigations consisted of measuring water temperature, water reaction, electrical conductivity of water, nitrogen and phosphate content and spring discharge. Groundwater samples were also collected for laboratory chemical analyzes to determine the concentrations of major ions, subordinate and minor elements, as well as for sanitary and bacteriological tests including the determination of the total bacterial count, the count of bacteria from the coli group, including Escherichia coli, the count of Shigella sp. and Salmonella sp. Physicochemical (except for minor elements) and microbiological determinations were made by hand using the laboratories of the Faculty of Geology at the University of Warsaw. In addition, soil samples were taken to determine the value of the coefficient of permeability using a laboratory permeability meter. In the course of the study, a very rich set of data was obtained, which was subjected to detailed analysis based on available cartographic materials, hydrogeological publications and archival data on sheep grazing. Research topics are interdisciplinary, from the border of several branches of science, such as hydrogeology, environmental protection and sanitary microbiology.