Дисертації з теми "Biological and chemical aspects"
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Evmorfopoulos, Evangelos. "Chemical and biological aspects of mercury in seafoods." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/27859.
Повний текст джерелаSnip, Erwin. "Industrial, chemical and biological aspects of phosphorus-containing heterocycles." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30036.
Повний текст джерелаWidestrand, Johan. "Assessment of trichothecene contamination : chemical aspects and biological methodology /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5808-0.pdf.
Повний текст джерелаYachnin, Jeffrey R. "Chemical, pharmacokinetic and biological aspects of platinum-based drugs /." Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-221-7/.
Повний текст джерелаDe, Silva Michael S. W. "Chemical and biological aspects of using dredged river Clyde sediments for land restoration." Thesis, University of Strathclyde, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292081.
Повний текст джерелаNengovhela, Nkhangweleni Ryneth. "Kinetics of the chemical and biological iron (II) oxydation." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/30337.
Повний текст джерелаBotello-Ruvalcaba, Martin Armando. "Physical, chemical, biological and management aspects of coastal ecosystems facing eutrophication : the Guaymas Bay, Sonora, Mexico." Thesis, University of Hull, 1999. http://hydra.hull.ac.uk/resources/hull:16865.
Повний текст джерелаFajardo, Norma N. "Biological and chemical aspects of agrocin 434 as a supplementary biocontrol agent for crown gall /." Title page, table of contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phf175.pdf.
Повний текст джерелаCopies of author's previously published articles inserted. Includes bibliographical references (leaves 72-90).
Juraimi, Abdul Shukor. "Studies on some biological aspects, competitive ability and chemical control of Bermudagrass (Cynodon dactylon (L.) Pers.)." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363407.
Повний текст джерелаWei, Xi. "Environmental screening of endocrine-disrupting chemicals and biological characterization of their effects on reproductive health." HKBU Institutional Repository, 2011. http://repository.hkbu.edu.hk/etd_ra/1225.
Повний текст джерелаRamahlo, Masetle Nelson. "Physico-chemical and biological characterization of soils from selected farmlands around three mining sites in Phalaborwa, Limpopo Province." Thesis, University of Limpopo (Turfloop Campus), 2013. http://hdl.handle.net/10386/1127.
Повний текст джерелаThe study was conducted to assess the impact of mining activities on selected soil physical, chemical and microbial properties on farmlands around three selected mining sites. Nine soil samples were collected from each of the following farms : Hans Merensky, Mogoboya and Leon Tom, Foskor Mine and JCI mining sites, respectively. Additional nine soil samples were collected from non-polluted Waterbok farm that serves as a control for the purpose of comparison. The samples were taken at 0–15, 15–30, 30–45 cm depths at three sampling points on each farm for physical, chemical and biological studies. However, soil samples collected for microbial (fungi, bacteria and actinomycetes) counts were surface (0–15 cm) soil samples. Soil chemical properties determined include pHw, electrical conductivity (ECe), exchangeable acidity (EA), organic carbon, available phosphorous, exchangeable cations as well as heavy metal (i.e. Mn, Zn, Cu, Pb, Cd, As and Sb) concentrations. The physical parameters determined include texture (sand, silt and clay) as well as bulk density. Soil pHw and ECe values decreased with depth; and ranged from 6.94 to 6.50 and from 12.24 to 10.76 mS cm-1, respectively. Exchangeable acidity showed a gradual increase with depth and ranged from 0.72 to 0.80 cmol(+)(kg), while percent organic carbon decreased with depth ranging from 1.41 to 2.19 %. Exchangeable cations, particularly K and Mg increased with depth while Ca decreased marginally with soil depth. Available phosphorous content decreased following increases in distance from the pollution source while heavy met.al contamination decreased with soil depth but increased further away from the pollution source. Significantly high loads of Pb, As and Sb were recorded at all depths on the three farms around the mining sites, which were largely responsible for the pollution but worse on the Leon Tom farm; with Pb constituting the greatest pollutant. The concentration of extractable heavy metals in the studied areas was in the order: As >Sb>Pb>Zn>Cu >Mn >Cd. Cadmium level appeared generally very low in all samples while elevated levels of Mn, Cu and Zn were detected at all depths in the polluted soils.Significant differences in microbial levels were detected at the various sampling points. The highest count of 3.82 and 6.20 CFU g-1 for fungi and actinomycete, respectively were both from the Leon Tom farm, while 6.46 CFU g-1 counts for bacteria was obtained from Mogoboya farm. Interestingly, fungal and actinomycetes activities were more sensitive to heavy metal contamination than bacteria that were significantly increased following soil pollution.
National Research Foundation (NRF)
Jankovic-Karasoulos, Tanja. "A case study of the physical, chemical and biological factors affecting dissolved organic carbon in the Warren Reservoir, South Australia /." Title page, table of contents and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09phj339.pdf.
Повний текст джерелаRetamales, Roberto. "A study of semi-intensive shrimp culture in Ecuador in relation to physical, chemical and biological conditions in the production ponds during El Nino and La Nina events (1996 to 1999)." Thesis, University of Stirling, 2002. http://hdl.handle.net/1893/3286.
Повний текст джерелаSouza, Natalia Medeiros de [UNESP]. "Gonipterus platensis (Coleoptera: Curculionidae): infestação em eucalipto, aspectos morfológicos e biológicos e controle." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144401.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Gonipterus platensis (Coleoptera: Curculionidae) é um inseto desfolhador do eucalipto de origem australiana presente no Brasil há mais de 30 anos. Após um longo período sendo controlado naturalmente com sucesso pelo parasitoide de ovos Anaphes nitens (Hymenoptera: Mymaridae) esse inseto voltou a causar danos em várias regiões produtoras de São Paulo, Paraná e Rio Grande do Sul, reforçando que ainda há necessidade de entendimento da dinâmica da praga no país e de elementos que auxiliem no seu manejo. Esse trabalho teve por objetivos realizar um levantamento de áreas de eucalipto atacadas pela praga, avaliar a morfometria de ootecas e sua relação com o total de ovos e a taxa de parasitismo em diferentes áreas do estado de São Paulo, avaliar o consumo foliar, viabilidade e desenvolvimento de larvas em diferentes espécies de eucalipto e avaliar a ação de diferentes inseticidas contra adultos dessa praga. Em estudo conduzido em parceria com empresas florestais, foi verificada a existência de dez espécies de eucalipto, quatro delas relatadas pela primeira vez além de cinco híbridos hospedeiros de Gonipterus spp. no Brasil, com o grau de severidade de desfolha variável, chegando a mais de 75% em alguns materiais; devido a ressurgência recente da praga há pouca informação sobre perdas em produtividade. Foi verificado que as estratégias de monitoramento e controle da praga não são padronizadas em todas as empresas. Em estudo para avaliação de ootecas a campo, foi observada correlação entre o comprimento das mesmas e o numero total de ovos. As taxas de parasitismo e razão sexual variaram de acordo com a região e foi verificado um grande número de parasitoides mortos dentro das ootecas. Em avaliação de consumo foliar de larvas de G. platensis em Eucalyptus urophylla e E. camaldulensis não foram observadas diferenças no consumo entre os 2 hospedeiros; o desenvolvimento em E. camaldulensis foi mais longo. Foram testados diversos produtos para o controle de adultos de G. platensis sendo eficientes bifentrina e Beauveria bassiana por ação tópica e bifentrina por ação de contato/ingestão. Os dados apresentados nesse trabalho podem ser utilizados para o ajuste de planos de manejo da praga.
Gonipterus platensis (Coleoptera: Curculionidae) is an Australian eucalypt defoliator present in Brazil for over 30 years. After a long period being naturally and successfully controlled by the egg parasitoid Anaphes nitens (Hymenoptera: Mymaridae) this insect is once again causing damage in several producing regions of São Paulo, Paraná and Rio Grande do Sul, highlighting that there is a need to understand the pest dynamics in the country and elements to improve its management. This study aimed to assess the eucalyptus areas attacked by the pest, verify egg capsules morphometry and its relation with total number of eggs and parasitism rate in different areas in the state of Sao Paulo, assess larval leaf consumption, viability and development on different species of eucalyptus and evaluate the effectiveness of different insecticides against adults. In a study conducted in partnership with forestry companies, ten species of eucalyptus, and five hybrid were reported as hosts of Gonipterus spp. in Brazil, four of those were reported for the first time. Defoliation levels varied, reaching over 75% in some hosts. Due to the recent ressurgence of the pest there is little information about productivity loss. Monitoring strategies and pest control are not standardized in all companies. In a study to evaluate egg capsules on the field, a correlation between their length and the total number of eggs was verified. The parasitism rates and sex ratio varied according to the region and a large number of parasitoids were found dead inside the egg capsules. Assessment of G. platensis larvae leaf consumption on Eucalyptus urophylla and E. camaldulensis did not show differences of consumption between these hosts; development on E. camaldulensis was slower. Several products were tested to control G. platensis adults. Only bifenthrin and Beauveria bassiana topic action bifenthrin contact/ingestion action were effective. The data presented in this work can be used for adjustment of pest management plans.
CNPq: 130604/2014-3
Silva, Alineaurea Florentino. "Uso de resíduo orgânico na produção de mandioca em transição agroecológica, no Projeto Pontal, Petrolina-PE." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9159.
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The soils of most of the rain-dependent areas farms of the semiarid region of the northeastern Brazil have low levels of elements such as nitrogen and phosphorus, hampering the achievement of results of production that allow the satisfactory maintenance of the agricultural activity in these areas. As a result, year after year the expected yields become increasingly rare and many farmers no longer believe in the viability of cultivation of some species, even those that have historically occupied spaces in these important properties, such as maize, beans and cassava. Cassava is a species of great importance in semi-arid environments, presenting great versatility in the production of fresh and processed foods and fodder. The use of organic residues from the properties for soil fertilization and improvement of growth of the vegetal species is one of the internationally recommended practices for a sustainable ecologically based agriculture. The objective of this work was to evaluate cassava (Manihot esculenta cranz) production and soil fertility with the use of organic residue in agroecological transition in the Pontal Project, Petrolina-PE. Semistructured interviews, soil collection, of residues and of the production in the communities were held in the communities Vira Beiju, Lajedo and Amargosa. The soil analyzes were carried out at Embrapa Semiarid and revealed the need for soil acidity correction (pH between 4,2 and 5,5) in all communities, addition of sources of phosphorus (P available< 3,8 mg.dm-3), organic matter (<5,5 g.kg-1) and zinc (< 6,95 mg.dm-3), especially in community Vira Beiju. Various activities that generate agricultural waste that can be used in local agriculture were identified, but in this study period (drought) only goat manure was found in greater quantity (5,0m3 per month), in all communities, being sold for obtaining income. Livestock production was one the most generating of waste, along with the crops, also mentioned as big generators of residues, by most of the interviewee (89%). The stable was the place with highest generation of residues in the property, during the study period (88.9 %). The response of the plant to the use of the tested residue (manure) or phosphorus application has been directly related to the soil type and hydric conditions during the plant cycle, being these conditions highly variable in this study in the three communities studied. The correction of the soil showed significant results when associated to the use of manure, being very promising to increase the yield of cassava in an agroecological transition system.
Os solos da maioria das propriedades de áreas dependentes de chuva, da região semiárida do nordeste brasileiro, possuem baixos teores de elementos como nitrogênio e fósforo, dificultando o alcance de resultados de produção que permitam a manutenção satisfatória da atividade agrícola nessas áreas. Como consequência, ano após ano, as safras esperadas tornam-se cada vez mais raras e muitos agricultores passam a não mais acreditar na viabilidade do cultivo de algumas espécies, mesmo aquelas que historicamente têm ocupado espaços importantes nessas propriedades, como milho, feijão e mandioca. A mandioca é uma espécie de grande importância nos ambientes semiáridos, apresentando grande versatilidade na produção de alimentos in natura e processados e forragem. O uso de resíduos orgânicos das propriedades para fertilização do solo e melhoria das condições de crescimento das espécies vegetais é uma das práticas internacionalmente preconizadas para uma agricultura de base ecológica. O presente trabalho teve como objetivo avaliar a produção de mandioca (Manihot esculenta cranz) e a fertilidade do solo com uso de resíduo orgânico, em transição agroecológica no Projeto Pontal, Petrolina-PE. Foram realizadas entrevistas semiestruturadas, coleta de solo, de resíduos e da produção nas comunidades Vira Beiju, Lajedo e Amargosa. As análises do solo e dos resíduos orgânicos encontrados nas propriedades foram realizadas na Embrapa Semiárido e revelaram a necessidade de correção da acidez (pH entre 4,2 e 5,5) em todas as comunidades, adição de fontes de fósforo (P disponível<3,8mg.dm-3), matéria orgânica (<5,5 g.kg-1) e zinco (<6,95 mg.dm-3), principalmente na Comunidade Vira Beiju. Foram identificadas diversas atividades geradoras de resíduos que podem ser utilizados na agricultura local, porém no período avaliado (estiagem) apenas o esterco caprino foi encontrado em maior quantidade (5,0m3/mês), em todas as comunidades, sendo comercializado para obtenção de renda. A criação de animais foi uma das atividades mais geradora de resíduos, junto com os cultivos, também apontados como grandes geradores de resíduos, pela maioria dos entrevistados (89%). O curral foi o local de maior geração de resíduos na propriedade, no período avaliado (88,9%). A resposta da planta ao uso do resíduo testado (esterco) ou aplicação de fósforo esteve diretamente relacionado ao tipo de solo e condições hídricas no período do ciclo da planta, sendo estas condições altamente variáveis no presente estudo nas três comunidades trabalhadas. A correção do solo mostrou resultados significativos quando associado ao uso do esterco, sendo bastante promissor para elevar a produtividade da mandioca em sistema de transição agroecológica.
Laurent, Fabien. "Impact de l'oxydation chimique et de la refonctionnalisation sur des paramètres physico-chimiques et biologiques de terres contaminées au HAP." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0033/document.
Повний текст джерелаIn order to clean up polycyclic aromatic hydrocarbon (PAH) contaminated soils, various techniques have been developed during the last decades, but their impact on soil functions was rarely considered. The objective of this study was to assess the impact of chemical oxidation treatments on different physico-chemical and biological parameters of PAH contaminated soil and to propose solutions to improve the biological functioning of oxidized soil. Various laboratory and field experiments have shown that the efficiency of chemical oxidation reactions (Fenton reaction and activated persulfate) on PAH concentrations depended on pollutant availability and soil physico-chemical properties. Besides, intense acidification processes have been observed on uncarbonated soil with a strong impact on soil physico-chemical and biological parameters. Moreover, this alteration was higher with activated persulfate treatment, leading to the loss of trace metals in water percolation. In the strongly acidified soil, the input of materials, suitable for pH increase, resulted in the restoration of biological activities and soil capacity to support vegetation. The association of chemical oxidation treatment and restoration techniques could present a good mean for soil rehabilitation. Finally, an index, which aimed to represent soil conditions based on the weight given to different parameters, was proposed and was used to evaluate changes induced by oxidation treatments and restoration techniques
Yukseler, Hande. "Biological And Chemical Sludge Filtration." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608608/index.pdf.
Повний текст джерелаs classical filtration theory and quantified by the well-known parameter specific cake resistance (SCR). However, the complexity of the actual phenomenon is clearly underestimated by the classical filtration theory and SCR is often not satisfactory in describing filterability. Although many scientific studies were conducted for a better analysis and understanding of the filtration theory, still a practically applicable solution to replace the classical theory for a better description of filterability has not been proposed yet. In the present study, blocking filtration laws proposed by Hermans and Bredé
e, dating back to 1936, which have been extensively used in the membrane literature for the analysis of fouling phenomenon and the multiphase filtration theory developed by Willis and Tosun (1980) highlighting the importance of the cake-septum interface in determining the overall filtration rate have been adopted for the analysis of filterability of sludge systems. Firstly, the inadequacy of the classical filtration theory in characterizing the filterability of real sludge systems and also the lack of the currently used methodology in simulating filtration operation was highlighted. Secondly, to better understand the effect of slurry characteristics and operational conditions on filtration, model slurries of spherical and incompressible Meliodent particles were formed. Finally, a methodology was developed with the gathered filtration data to assess the filterability of the sludge systems by both theories. The results clearly show that both approaches were superior to the classical approach in terms of characterizing the filterability of sludge systems. While blocking laws yielded a slurry specific characterization parameter to replace the commonly used SCR, the multiphase theory provided a better understanding of the physical reality of the overall process.
Sader, Kasim Stefan. "Aspects of biological electron microscopy." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434150.
Повний текст джерелаAltschul, Stephen Frank. "Aspects of biological sequence comparison." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/102708.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Bibliography: leaves 165-168.
by Stephen Frank Altschul.
Ph.D
Noatch, Matthew R. "An Evaluation of Chemical, Biological, and Combined Chemical-Biological Approaches for Controlling Snails in Aquaculture Ponds." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/198.
Повний текст джерелаEdwards, John W. "Biological monitoring of occupational chemical exposure /." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phe2652.pdf.
Повний текст джерелаPeyfoon, Elham. "Chemical and biological properties of propolis." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510828.
Повний текст джерелаZhang, Zhibing. "Novel micromanipulation studies of biological and non-biological materials." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6512/.
Повний текст джерелаJosefsson, Ann. "Postpartum Depression : Epidemiological and Biological Aspects." Doctoral thesis, Linköping : Univ, 2003. http://www.ep.liu.se/diss/med/07/81/index.html.
Повний текст джерелаTullett, Jayne Margaret. "Chemical and biological properties of S-nitrosothiols." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30786.
Повний текст джерелаBunyan, Kerry Emma. "Chemical and biological studies of manganese transferrin." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/15569.
Повний текст джерелаJiang, Lu. "Chemical synthesis of peptides with biological importance." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/12302.
Повний текст джерелаThinnes, Cyrille Christophe. "Chemical and biological studies on human oxygenases." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:455f2e65-f294-461b-b44f-cd53796b14a0.
Повний текст джерелаBjörkman, Barbro. "Ethical aspects of owning human biological material." Licentiate thesis, KTH, Philosophy and History of Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-610.
Повний текст джерелаSylvén, Sara M. "Biological and Psychosocial Aspects of Postpartum Depression." Doctoral thesis, Uppsala universitet, Obstetrik & gynekologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-170818.
Повний текст джерелаUPPSAT
Loop, Franciscus Theodorus Lambertus van der. "Cell biological aspects of muscle cell differentiation." Maastricht : Maastricht : Universitaire Pers Maastricht ; University Library, Maastricht University [Host], 1996. http://arno.unimaas.nl/show.cgi?fid=7288.
Повний текст джерелаHovenga, Sjoerd. "Clinical and biological aspects of multiple myeloma." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/30102636X.
Повний текст джерелаBjörkman, Barbro. "Ethical aspects of owning human biological material /." Stockholm : Division of Philosophy, Department of Philosophy and the History of Technology, Royal Institute of Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-610.
Повний текст джерелаMaffulli, Nicola. "Achilles tendon ailments : clinical and biological aspects." Thesis, University of Aberdeen, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265637.
Повний текст джерелаMatthew, Caroline Zoe. "Biological and molecular aspects of Sodalis glossinidius." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/29872.
Повний текст джерелаLewis, Randy Stewart. "Nitric oxide kinetics in biological systems." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36947.
Повний текст джерелаBerg, Michael C. Ph D. Massachusetts Institute of Technology. "Biological applications of weal polyelectrolyte multilayers." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33599.
Повний текст джерелаIncludes bibliographical references.
This thesis research focused on biological applications of ultra-thin weak polyelectrolyte multilayers with specific emphasis on cell patterning, drug delivery, and antibacterial coatings. All of these very different applications were studied using three different polymers - polyacrylic acid (PAA), poly(allylamine hydrochloride) (PAH), polyacrylamide (PAAm). The first part of this thesis focuses on patterning polyelectrolyte multilayers found to resist mammalian cell adhesion, with ligands that promote specific interactions for adhesion. It was found that by patterning PAH on polyelectrolyte multilayers, the patterned functional group density and thickness could be tuned through ink pH adjustment. By changing the surface density of amine groups in the PAH patterns, the ligand density could also be altered using specific chemistry to attach peptides containing the tri-peptide sequence, RGD, which is known to promote cell adhesion in a number of cell types. The RGD density in the patterned regions determined the number of cells attached and the amount of cytoskeletal protein organization. The second part is an evaluation of porous polyelectrolyte multilayers as a delivery system for controlled release of small molecule drugs. The loading and releasing properties of porous PAH/PAA multilayers were investigated using the two drugs, ketoprofen and cytochalasin D. It was determined that the amount of drug released was proportional to the number of porous layers. Nanoporous films showed zero-order release, whereas microporous films displayed Fickian diffusion. The efficacy of the released drugs was checked by monitoring the effect of released cytochalasin D on fibroblasts' division.
(cont.) In the final part of this thesis, the antibacterial properties of both silver-loaded polyelectrolyte multilayers and superhydrophobic multilayers are examined. It was found that silver loaded multilayers killed bacteria to an extent greater than 99.99% for both airborne and waterborne models. Superhydrophobic films showed excellent anti-fouling properties for proteins, mammalian cells, and bacteria.
by Michael C. Berg.
Ph.D.
Domijan, Mirela. "Mathematical aspects of chemical reaction networks." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495019.
Повний текст джерелаHale, Waverly Mitchell. "Surface chemical aspects of microbubble flotation." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45816.
Повний текст джерелаIn order to demonstrate the ability of microbubble flotation to superclean coal to ash levels of less than 2%, several Eastern U. S. coals have been tested. The results show that the process is capable of producing superclean coal with improved recovery as compared to the conventional flotation process.
To further improve and understand the microbubble flotation process, electrokinetic studies of the hydrocarbon oils used in flotation as collectors have been conducted. Also, the effect of oil emulsifiers on the zeta potential of oil droplets has been studied. In general, oil droplets are negatively charged and negative zeta potential is reduced with the addition of nonionic and cationic surfactants. On the other hand, the negative charge is increased with the addition of an anionic reagent. It has also been shown that the negative zeta potential of oil droplets increases with increasing hydrocarbon chain length.
The effects of different collectors on induction time and flotation have been determined by conducting microflotation and induction time experiments using an Elkhorn seam coal sample. The results show that industrial oils combined with the coal have the shortest induction times and, therefore, the highest flotation yields as compared to pure hydrocarbon oils. It has also been shown that oil emulsifiers tend to increase flotation yield and reduce particle/bubble induction time.
Master of Science
Batarseh, Eyad. "Chemical and Biological Treatment of Mature Landfill Leachate." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2698.
Повний текст джерелаPh.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering
Tsang, Wing Yin. "The chemical and biological activities of β-sultams." Thesis, University of Huddersfield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417289.
Повний текст джерелаDa, Silva Paula Maria Alexandra. "Chemical and biological studies on African Crypolepis species." Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300913.
Повний текст джерелаElsnini, Ruwida Mansour. "Chemical characterization and biological activity of African propolis." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28825.
Повний текст джерелаBora, Mihail. "Chemical and biological sensors based on organic semiconductors." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53203.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 101-109).
In this thesis I designed, fabricated and characterized two types of sensors: chemical sensors based on organic thin film transistors, and a miniaturized surface plasmon resonance biosensors for biotechnology and medical diagnostics applications. During completion of my research projects I designed and optimized several device architectures using numerical simulations and fundamental physical evaluation of sensing mechanism and performance. Fabricated devices were tested in custom built experimental setups in microfluidic testing chambers using automatic data measurement. Surface functionalization of device surface using self assembled monolayer techniques was employed for experiments that required specificity towards analyzed biological species.
by Mihail Bora.
Ph.D.
Wang, XiuZhu. "Investigation of biological and chemical interactions by AFM." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615986.
Повний текст джерелаMatheson, Christopher. "Chemical and biological studies with Nek2 kinase inhibitors." Thesis, University of Newcastle upon Tyne, 2012. http://hdl.handle.net/10443/2024.
Повний текст джерелаNascimento, Raimundo Regivaldo Gomes do. "Study Chemical and Biological Margaritopsis carrascoana Wright (Rubiaceae)." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13424.
Повний текст джерелаMargaritopsis carrascoana is a small shrub belonging to the Rubiaceae family and endemic from northeastern of Brazil flora growing in the sandy soils of the region of Ibiapaba and Araripe plateaus â Cearà state. The absence of reports of phytochemical studies related to this species, combined with occurrence of bioactive alkaloids in the genus, motivated us to perform chemical study. The plant specimen was collected in Araripe plateu, in MoreilÃndia-PE county. The phytochemical investigation of the ethanolic extract from the stems yielded the alkaloids calycosidine, hodgkinsine, N-8â-formyl-calycosidine and N-8â-methyl-N-1â-desmethylisocalycosidine, besides neolignan dihydrodehydrodiconiferyl alcohol 4-O-β-D-glucopyranoside, the flavonol luteolin 7-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl, the triterpenes lupeol and ursolic acid, and the mixture of β-sitosterol and stigmasterol steroids, as aglycones and glycosylated. From the ethanolic extract of the leaves were isolated the flavonoid luteolin 7-O-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranoside, chrysoeriol 7-O-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranoside, luteolin 7-O-{β-D-apiofuranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl} and luteolin 7-O-{α-L-rhamnopyranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl}. The alkaloids N-8"-formyl-calycosidine, N-8â-methyl-N-1â-desmethylisocalycosidine, luteolin 7-O-{β-D-apiofuranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl} and luteolin 7-O-{α-L-rhamnopyranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyra-nosyl}, are being reported for the first time in the literature, and the other secondary metabolites are unprecedented in the genus Margaritopsis. The secondary metabolites were isolated using classical chromatography techniques; including adsorption chromatography on silica gel, exclusion chromatography on Sephadex LH-20, reverse phase chromatography (C-18), and high performance liquid chromatography (HPLC). For structural characterization were used infrared spectroscopy, mass spectrometry and nuclear magnetic resonance techniques including uni (1H NMR and 13C NMR and DEPT 135) and two-dimensional experiments (HMBC, HSQC, COSY and NOESY), and comparison with the literature data. In addition, the flavonoids flavonol luteolin 7-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl, luteolin 7-O-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranoside, luteolin 7-O-{β-D-apiofuranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl} and luteolin 7-O-{α-L-rhamnopyranosyl-(1→6)-[β-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl, sho-wed antioxidant activity greater than the BHT and quercetin standards, while ethanol extracts of stems and leaves showed inhibitory activity on the acetylcholinesterase enzyme. On the other hand, hodgkinsine showed potent cytotoxic activity against ovary, glioblastoma and colon cancer cells lines. The ethanol extract of the leaves and its alkaloidal fraction were submitted to nociception test and yielded good results. The ethanolic extract of the leaves was subjected to gastric antiulcer activity test, leading to a significant reduction in gastric lesions induced by ethanol in mice.
Margaritopsis carrascoana à um pequeno arbusto pertencente à famÃlia Rubiaceae e endÃmico da flora do Nordeste brasileiro, que cresce em solos arenosos do planalto da Ibiapaba e serra do Araripe - CearÃ. A ausÃncia de relatos acerca de estudos fitoquÃmicos relacionados à espÃcie, aliada a ocorrÃncia de alcalÃides bioativos no gÃnero, nos motivou ao seu estudo quÃmico. Desta forma, o espÃcimen vegetal foi coletado na chapada do Araripe, municÃpio de MoreilÃndia-PE. A investigaÃÃo fitoquÃmica do extrato etanÃlico dos talos resultou no isolamento dos alcalÃides calicosidina, hodgkinsina, N-8â-formilcalicosidina e N-8â-metil-N-1â-desmetilisocalicosidina, da neolignana Ãlcool 4-O-β-D-glicopiranosil-di-hidro-desidrodiconiferÃlico, do flavonÃide 7-O-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil luteolina, dos triterpenos lupeol e o Ãcido ursÃlico, e da mistura de esterÃides β-sitosterol e estigmasterol, como agliconas e nas formas glicosiladas. A partir do estudo do extrato etanÃlico das folhas foram isolados os flavonÃides 7-O-[β-D-glicopiranosil-(1→6)-β-D-apiofuranosil] luteolina, 7-O-[β-D-glicopiranosil-(1→6)-β-D-apiofuranosil] crisoeriol, 7-O-{β-D-apiofuranosil-(1→6)-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina e 7-O-{α-L-ramnopiranosil - (1→6) - [α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina. Os alcalÃides N-8â-formilcalicosidina e N-8â-metil-N-1â-desmetilisocalicosidina, e os flavonÃides 7-O-{β-D-apiofuranosil-(1→6)-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina e 7-O-{α-L-ramnopiranosil-(1→6)-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina, estÃo sendo relatados pela primeira vez na literatura, enquanto todas as demais substÃncias possuem carÃter inÃdito no gÃnero Margaritopsis. O isolamento dos metabÃlitos secundÃrios foi conduzido atravÃs de tÃcnicas cromatogrÃficas clÃssicas, incluindo cromatografia de adsorÃÃo em gel de sÃlica, cromatografia por exclusÃo molecular em Sephadex LH-20, cromatografia de fase reversa (C-18) e cromatografia lÃquida de alta eficiÃncia (CLAE). Para a caracterizaÃÃo estrutural foram utilizadas tÃcnicas espectroscÃpicas utilizando infravermelho, espectrometria de massas e ressonÃncia magnÃtica nuclear, incluindo tÃcnicas uni (RMN 1H e RMN 13C e DEPT 135) e bidimensionais (HMBC, HSQC, COSY e NOESY), alÃm de comparaÃÃo com dados descritos na literatura. Em adiÃÃo, os flavonÃides 7-O-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil luteolina, 7-O-[β-D-glicopiranosil-(1→6)-β-D-apiofuranosil] luteolina, 7-O-{β-D-apiofuranosil-(1→6)-[α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina e 7-O-{α-L-ramnopiranosil-(1→6) - [α-L-ramnopiranosil-(1→2)-β-D-glicopiranosil} luteolina apresentaram atividade antioxidante maior que os padrÃes BHT e quercetina, enquanto os extratos etanÃlicos dos talos e folhas apresentaram atividade inibidora da enzima acetilcolinesterase. Por outro lado, o alcaloide hodgkinsina apresentou potencial citotÃxico frente Ãs cÃlulas de ovÃrio, glioblastoma e colon. No teste de nocicepÃÃo, realizado com o extrato etanÃlico das folhas e a fraÃÃo alcalÃidica, foram observados resultados positivos para ambas as fraÃÃes. O extrato etanÃlico das folhas foi submetido a teste de atividade antiÃlcera gÃstrica, levando a uma reduÃÃo significativa da Ãrea de lesÃo gÃstrica induzida pelo etanol em camundongos.
Carvalho, Jarbas Lima de. "Chemical and biological study of Bauhinia pulchella Benth." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13413.
Повний текст джерелаThis present work reports the chemical and biological analysis of the stem and leaves from Bauhinia pulchella. In this study, the ethanol extract from stems was obtained by maceration, subjected to chromatographic fractionation, leading to isolation of three flavonoids: (+)-3â,4â-dihydroxyphenyl-chroman-7-ol (BP-2), (-)-fisetinidol (BP-3) and (+)-epicatechin (BP-4); a mixture of triterpenes taraxerone and β-amyrenone (BP-1); a mixture of steroids sitosterol and stigmasterol (BP-5); and a bibenzyl named 2-hydroxy-3â,5â-dimethoxybibenzyl (BP-6). It is notewhorthy to mention that BP-1 and BP-4 substances are unprecedented in the genus, while BP-2 is unpublished. Chemical structures of secondary metabolites obtained were elucidated by 1H and 13C NMR; IR and MS associated with comparison of data described in the literature. Chemical composition of the essential oil from leaves of B. pulchella, obtained by hydrodistillation, was determined and quantified by gas chromatography-mass spectroscopy (GC/MS) and gas chromatography-flame ionization detector (GC/FID), which identified 95,68% of all constituents. α-pinene (23.89%); caryophyllene oxide (22.43%) and β-pinene (12.19%) were the major components. The essential oil was tested against Aedes aegypti larvae and showed LC50 value of 105.93 Â 1.48 μg/mL. The cytotoxic activity of essential oil was evaluated on human tumor cell lines (HL-60; MCF-7; NCI-H292 and HEP-2) was evaluated, showing IC50 values with confidence intervals of 9.941 (8.238 to 12.00), 53.05 (41.39 to 67.99), 48.98 (44.22 to 54.25) and 50.42 (42.47 to 59.87) μg/mL, respectively and the cell line HL-60 the most sensitive among the cells tested. This is the first report of the chemical study of Bauhinia pulchella, as well the investigation of larvicidal activity and cytotoxicity of the essential oil from its leaves.
O presente trabalho relata o estudo quÃmico e biolÃgico do caule e das folhas de Bauhinia pulchella. Nesse estudo, o extrato etanÃlico do caule, obtido por maceraÃÃo, foi submetido a fracionamento cromatogrÃfico levando ao isolamento de trÃs flavonoides (+)-3â-4âdiidroxifenil-cromano-7-ol (BP-2), (-)-fisetinidol (BP-3) e (+)-epicatequina (BP-4); da mistura de triterpenos taraxerona e β-amirenona (BP-1); da mistura de esteroides sitosterol e estigmasterol (BP-5) e de um bibenzil denominado 2-hidrÃxi-3â-5â-dimetoxibibenzila (BP-6). Cabe ressaltar que as substÃncias BP-1 e BP-4 sÃo inÃditas no gÃnero, enquanto BP-2 à inÃdita na literatura. As estruturas dos metabÃlitos secundÃrios isolados foram elucidadas por RMN 1H e 13C; IV e EM, juntamente com a comparaÃÃo com os dados descritos na literatura. A composiÃÃo quÃmica do Ãleo essencial das folhas de B. pulchella, obtido por hidrodestilaÃÃo, foi determinada e quantificada por cromatografia gasosa acoplada à espectrometria de massas (CG-EM) e detector de ionizaÃÃo por chama (CG-DIC), sendo, portanto, identificados 95,68% dos seus constituintes: α-pineno (23,89%), Ãxido de cariofileno (22,43%) e β-pineno (12,19%) foram os constituintes majoritÃrios. O Ãleo essencial teve sua atividade larvicida sobre Aedes aegypti avaliada, sendo obtido um valor de CL50 igual a 105,93  1,48 μg/mL. O poder citotÃxico do Ãleo essencial foi avaliado sobre as linhagens tumorais humanas HL-60, MCF-7, NCI-H292 e HEP-2, sendo obtidos valores de CI50 e intervalos de confianÃa iguais a 9,941 (8,238 a 12,00); 53,05 (41,39 a 67,99); 48,98 (44,22 a 54,25) e 50,42 (42,47 a 59,87) μg/mL, respectivamente, sendo a linhagem celular HL-60 a mais sensÃvel dentre as cÃlulas testadas. Este à o primeiro relato do estudo quÃmico de Bauhinia pulchella, bem como da investigaÃÃo da atividade larvicida e citotÃxica do Ãleo essencial de suas folhas.
Aguiar, Gisele Rocha. "Chemical and biological evaluation of propolis of Alagoas." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15888.
Повний текст джерелаA prÃpolis vermelha oriunda do Estado de Alagoas possui uma composiÃÃo quÃmica rica em isoflavonoides e tem sido usada como remÃdio tradicional na medicina popular por apresentar propriedades antioxidante e antiviral. Sua relevÃncia decorre, principalmente, por apresentar diversas propriedades biolÃgicas, dentre elas: antimicrobiana, anti-cancerÃgena, citotÃxica e antitumoral. Neste trabalho foi realizado o estudo dos compostos fixos presentes na fraÃÃo hexÃnica da prÃpolis, o qual apresentou trÃs Ãsteres: o hexadecanoato de metila (15,20%), o tetracosanoato de metila (10,40%) e o octadecanoato de metila (2,39%). Foram isoladas do extrato etanÃlico quatro isoflavanas (2â-hidroxi-4â,7-dimetoxiisoflavana [PV-1], 2â,7-dihidroxi-4â-metoxiisoflavana [PV-3], 4â,7-dihidroxi-2â-metoxiisoflavana [PV-4] e 2â,4â-dihidroxi-7-metoxiisoflavana [PV-5]), uma chalcona (2â,4â,4-trihidroxichalcona [PV-6]), e um triterpeno (lup-20(29)-en-3-ol [PV-2]), jà conhecidos na prÃpolis vermelha. A determinaÃÃo estrutural das substÃncias foi realizada atravÃs de mÃtodos espectroscÃpicos de IV, RMN de 1H, RMN de 13C-BB, RMN de 13C-DEPT 135Â, COSY, HSQC, HMBC e CG-EM. Realizou-se a determinaÃÃo de fenÃis totais, usando espectofotÃmetro, no extrato etanÃlico (EEPV), o qual apresentou um teor de compostos fenÃlicos de 133,3  4,35 mg de EAG/ g de amostra, resultado inferior aos relatados na literatura. Outro teste realizado foi o de atividade antioxidante, usando o mÃtodo de sequestro do radical DPPH, tanto no extrato etanÃlico, quanto nas fraÃÃes hexÃnica, diclorometano, acetato de etila e metanÃlica, apresentando resultados satisfatÃrios e superiores ao do padrÃo Vitamina C. AlÃm deste, foi realizado o ensaio de inibiÃÃo da enzima acetilcolinesterase, atravÃs de mÃtodo colorimÃtrico, no extrato etanÃlico e nas fraÃÃes hexÃnica, diclorometano, acetato de etila e metanÃlica, quase todos apresentando resultados positivos em relaÃÃo ao padrÃo sal de Eserina.
Hildreth, J. L. "Chemical and biological studies of technetium nitrosyl complexes." Thesis, Loughborough University, 1992. https://dspace.lboro.ac.uk/2134/33014.
Повний текст джерела