Dissertations / Theses on the topic 'Lipid compositions'
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Hillbrick, Gordon Colin, and kimg@deakin edu au. "THE LIPID COMPOSITION OF CASHMERE GOAT FIBRES." Deakin University, 1994. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20031205.162817.
Full textFischer, Carol Lea. "Oral mucosal lipids are antimicrobial against Porphyromonas gingivalis, induce ultrastructural damage, and alter bacterial lipid and protein compositions." Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/2494.
Full textJahan, Kishowar. "Quality in organic, free-range and conventional chicken breasts related to lipid antioxidant compositions." Thesis, University of Strathclyde, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417332.
Full textShah, Siddharth Prakashchandra. "LIPID COMPOSITIONS OF MICROBIAL ORGANISMS ISOLATED FROM EXTREME ENVIRONMENTS AND THEIR IMPLICATION IN THERMO STABILITY OF BACTERIAL CELL MEMBRANE STRUCTURE." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/419298.
Full textPh.D.
Microorganisms with an ability to thrive in harsh environments are referred as “extremophiles”. With advances in biotechnology, interest has grown in the extremophile research because of their unique macromolecules’ characteristics due to their growth environments. Over last decade, researchers have isolated many extremophiles from environments like volcano, salt lakes, hydrothermal vents, deep oceans, Antarctica glaciers etc. Macromolecules of these extremophiles are responsible for their survival in extreme environments. In this research work we have isolated lipid molecules from three different microorganisms. 1) GWE1 strain, a thermophilic bacterium, isolated from dark crusty material from sterilization ovens. 2) 7L strain, a thermophilic bacterium, isolated from Chilean Copahue Volcano. 3) I1P strain, a facultative anaerobe of the family Enterobacteriaceae, recently isolated from Antarctica. Complex lipid arrangement and/or type in the cell membrane are known to affect thermostability of microorganisms and efforts were made to understand the chemical nature of the polar lipids of membrane. In this work, we extracted total lipids from cell membrane, separated them by TLC into various fractions and characterize the lipid structures of fractions with analytical tools such as 1H, 13C, 31P and 2D NMR spectroscopy, ATR-FTIR spectroscopy and MSn spectrometry. In GWE1 strain, we were able to identify glycerophosphoethanolamine, glycerophosphate, glycerophosphoglycerol and cardiolipin lipid classes and an unknown glycerophospholipid class with novel MS/MS spectra pattern. We have also noticed the presence of saturated iso-branched fatty acids with NMR spectra in individual lipid classes. In case of I1P strain, we have identified glycerophosphoglycerol, glycerophosphoethanolamine, glycerophosphate, and acyl glycerophosphoglycerol lipid classes with unsaturated fatty acids in their structure, which could be one of the many reasons for survivability at lower temperatures. In case of 7L strain, we were able to identify glycerophosphoglycerol, cardiolipin, glycerophosphoethanolamine and glycerophosphate lipid classes with saturated iso branched fatty acids. FAME analysis revealed iso-15:0 (52.29 %) and iso-17:0 (18.64 %) as major fatty acyl chains. We did not observe major difference in polar head group composition of lipid classes between thermophiles (GWE1 and 7L) compare to psychrophiles (I1P). Major difference among these three strains was in fatty acid composition of lipid molecule. Both thermophiles showed presence of lipids with long chain saturated fatty acids while I1P showed presence of lipid molecule with unsaturated fatty acid chain. Lipids made of unsaturated fatty acids have lower melting points and they introduce kink in the cell membrane structure. At lower temperatures, these effects allow membrane to maintain fluidity and its functionality, which in turn allows the microorganism to grow at lower temperature. Lipids made with saturated iso branched fatty acid chain have higher melting points and they pack together densely in cell membrane. At high temperature because of higher melting point and dense packing, membrane fluidity is not affected and this effect allows microorganism to grow at the higher temperature. We believe that change in fatty acid composition is one of the many reasons for these microorganisms to survive the extreme condition. Thermostability of the other macromolecules (DNA, enzyme) of these extremophiles is not studied in this dissertation.
Temple University--Theses
鄺懿珩 and Yi-hang Agnes Kwong. "Lipid composition and lipases of Angiostrongylus cantonensis (nematoda: metastrongyloidea)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31209208.
Full textKwong, Yi-hang Agnes. "Lipid composition and lipases of Angiostrongylus cantonensis (nematoda: metastrongyloidea) /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12583273.
Full textHitchcock, C. A. "Antifungal agents and membrane lipids of Candida albicans." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382567.
Full textBolton-Smith, C. "The effect of dietary fats on membrane lipid composition and atherogenesis." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254369.
Full textCharalambous, Kalypso Nicola. "The effect of lipid bilayer composition on small multidrug resistance transporters." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432740.
Full textJamieson, Elizabeth Cherry. "Human brain lipid fatty acid composition in relation to infant diet." Thesis, Connect to e-thesis, 1998. http://theses.gla.ac.uk/981/.
Full textPh.D. thesis submitted to the Faculty of Medicine, University of Glasgow, 1998. Research carried out in the Departments of Pathological Biochemistry and Child Health, Royal Hospital for Sick Children, Yorkhill NHS Trust. Includes bibliographical references. Print version also available.
Nada, Filipović. "Uticaj sastava i uloge lipida brašna u procesu izrade hleba." Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 1998. https://www.cris.uns.ac.rs/record.jsf?recordId=71440&source=NDLTD&language=en.
Full textAbstract was processed by technology for Optical character recognition (OCR).Composition and quantities of nonpolar, polar and starch lipids were identified in different stages of bread making process. Changes and translocations of lipid compounds influenced by physical, mechanical and heat treatment during the technological process were determined, too.Based on fatty acid composition in different lipid compounds separated by TLC and on probability calculation, the most probable composition of them was est imated.In nonpolar lipid extracts of flour, over 60 % and in bread over 40 % of lipid compounds were identified (ASG, MG and TG).In polar lipid extracts over 60 % of lipid compounds were identified (DGMG,DGDG, MGMG and MGDG) but in starch lipids only LPI and NAPE were present.In lipid extract and lipid compounds about 98 % of fatty acids were identi- fied with the greatest shane of linoleic acid.The influence of adding three commercial emulsifiers in different stages of dough making on bread quality was also invest igated.Acting of commercial emulsifiers in dough and bread depends on their type, composition and quantity, as well as, on flour quality. Improving effects can be achieved only if emulsifiers ane added at the beginning of mixing stage or during dough development.These results comprise to better understanding of the lipid compounds role, the place of their acting in breadmaking process as well as their interaction with commercial emulsifiers.
Chang, Huey-Huey 1962. "Dietary fat effects on egg yolk lipid composition and hepatic lipogenic enzymes." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277290.
Full textBennoson, Janet. "The effect of manipulating the macronutrient composition of meals postprandial lipid metabolism." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310698.
Full textDyda, Rachael Y. "Linking phylogeny and lipid composition of natural bacterial communities in arctic waters." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3252.
Full textThesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Li, Tong. "Lipid Class Composition of Oysters, Crassostrea virginica, Exposed to Sediment-Associated PAHs." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539617705.
Full textMonteiro, Regina Teresa Rosim. "Lipid production and composition in haploid and diploid strains of Aspergillus nidulans." Thesis, University of St Andrews, 1985. http://hdl.handle.net/10023/14174.
Full textKurt, Esra. "Associations between lipid composition, shelf life and sensory quality in ruminant meats." Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/a77d9a0c-f888-4650-b6b8-7c1b8f5cee45.
Full textAlomaim, Haya. "Effects of Dietary Calcium on Body Composition and Lipid Metabolism in Rats." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37602.
Full textZampelas, Antonios. "Effect of dietary fatty acid structure and composition on postprandial lipid metabolism." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/770401/.
Full textAzevedo, Vítor Manuel Madureira. "Lipidomic study of the red marine macroalgae as source of bioactive compounds." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17513.
Full textMarine macroalgae, or seaweeds, have gained an increased interest in recent times for the use in various biotechnological applications, due to the added-value of their chemical constituents. Among them, glycolipids and phospholipids display several commercial applications in a wide spectrum of industries, such as food, pharmaceutical and cosmetic. In an effort to further understand the lipid composition of macroalgae, the present work reports, for the first time, the isolation and characterization of the polar lipid profile of the red macroalgae Porphyra dioica cultivated on a land-based integrated multi-trophic aquaculture (IMTA) system, using a lipidomic-based approach employing hydrophilic interaction liquid chromatography-eletrospray ionization mass spectrometry (HILIC-ESI-MS). The fatty acid profile of this species of seaweed was also determined, accounting for season variability and its life cycle. The polar lipid profile of P. dioica revealed the presence of over 69 molecular species, corresponding to glycolipids (sulfoquinovolsyldiacylglycerols, sulfoquinovosylmonoacylglycerols, digalactosyldiacylglycerols) and glycerophospholipids (lyso- and phosphatidylglycerols), lyso- and phosphatidylcholines), as well as phytyl derivatives. Some of these polar lipids contain polyunsaturated fatty acids (PUFAs), namely arachidonic acid (C20:4) and eicosapentaenoic acid (C20:5), thus revealing the ability of P. dioica to biosynthesize this long chain PUFAs. P.dioica from the winter season revealed to be richer in PUFA content, accounting for 37.0% of total fatty acid (TFA) content, as opposed to P. dioica from the summer season (25.0% of TFA content). Eicosapentaenoic acid (EPA) content was revealed to be being significantly higher in the winter season (25.2% of TFA content). The diploid sporophyte conchocelis phase of P. dioica showed to possess the highest amount of PUFAs (47.0% of TFA content), with arachidonic acid being the most abundant fatty acid (21.2% of TFA content). Several of the lipids identified have been reported to possess nutritional and health benefits, thus allowing the valorisation of P. dioica from IMTA as a source of bioactive compounds, adequate for the use in a wide range of different applications and as a functional food, rich in omega-3 fatty acids.
As macroalgas têm vindo a ganhar um interesse cada vez maior para o uso em diversas aplicações biotecnológicas, devido ao valor acrescentado dos seus diferentes constituintes. Entre estes, os glicolípidos e os fosfolípidos podem ser usados comercialmente em diferentes indústrias, tais como as indústrias alimentar, farmacêutica e cosmética. Com o objetivo de compreender melhor a composição lipídica das macroalgas, o presente trabalho relata, pela primeira vez, a caracterização do perfil de lípidos polares da macroalga vermelha Porphyra dioica, cultivada num sistema de aquacultura multi-trófica integrada (IMTA), utilizando para esse fim uma abordagem lipidómica baseada na espectrometria de massa (HILIC-ESI-MS). Foi também determinado o perfil de ácidos gordos da referida espécie de alga, tendo em consideração a variabilidade sazonal e o seu ciclo de vida. O perfil de lípidos polares da alga P. dioica revelou a presença de mais de 69 espécies moleculares diferentes, correspondendo a classes de glicolípidos (sulfoquinovosildiacilgliceróis, sulfoquinovosilmonoacilgliceróis e digalactosildiacilgliceróis), fosfolípidos (liso- e fosfatidilglicerol, liso- e fosfatidilcolinas) e derivados fitil. Alguns destes lípidos polares contêm ácidos gordos polinsaturados (PUFAs) na sua composição, nomeadamente o ácido araquidónico (C20:4) e ácido eicosapentaenóico (C20:5), revelando, assim, a capacidade da alga P. dioica em biossintetizar este tipo de ácidos gordos polinsaturados de cadeia longa. Considerando a variação sazonal do conteúdo em ácidos gordos, a P. dioica cultivada no inverno revelou ser mais rica em PUFAs, correspondendo a 37.0% do conteúdo total de ácidos gordos, contrariamente à P. dioica cultivada no verão (25.0%). O conteúdo em ácido eicosapentaenóico (EPA) é significativamente maior na estação de inverno (25.2%). O perfil em ácidos gordos também variou com o ciclo de vida P. dioica, sendo que na fase de conchocelis a quantidade de PUFA é significativamente mais elevada (47.0% de conteúdo de ácidos gordos), sendo o ácido araquidónico o ácido gordo mais abundante (21.2% de conteúdo de ácidos gordos).Várias classes de lípidos polares foram identificados como possuindo benefícios nutricionais e para a saúde, permitindo assim a valorização da alga vermelha P. dioica produzida em IMTA como uma fonte de compostos bioativos, adequados para o uso numa grande variedade de aplicações como um alimento funcional, rica em ácidos gordos polinsaturados ómega-3.
White, Philip Lewis. "The effects of environmental warming on Antarctic soil microbial communities." Thesis, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340641.
Full textHughes, David Aled. "Regulation of lymphocyte stimulation by lipid components of lung lining fluid and changes in lipid composition in chronic inflammatory lung diseases." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46831.
Full textDurnford, Edward A. D. "Lipid composition of selected tissues and milk of phocid seals of eastern Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0018/MQ54891.pdf.
Full textLi, Ling. "The analysis of global gene expression related to starch, lipid and protein composition." [Ames, Iowa : Iowa State University], 2006.
Find full textBrown, Angela Carin Wrenn Steven Parker. "The effect of lipid composition on cholesterol-rich domain size in model membranes /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2809.
Full textJoseph, Shama Vasanthi. "Effect of different conjugated linoleic acid isomers on lipid metabolism and body composition." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27641/27641.pdf.
Full textRasheed, Nabeela. "The effects of sterol biosynthesis inhibitors on the lipid composition of Apium graveolens." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385160.
Full textJames, Alexander David. "Membrane lipid composition response to growth conditions in prokaryotic extremophiles and non-extremophiles." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368216.
Full textDu, Plessis Michelle. "The role of carnitine in eukaryotic cells : Using yeast as a model." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97946.
Full textENGLISH ABSTRACT: Previous studies in yeast in this laboratory have found carnitine to be both protective against oxidative stress induced by hydrogen peroxide and to increase the detrimental effect of dithiothreitol. These phenotypes were found to be independent of the role of carnitine within the carnitine shuttle. A screen for suppressor mutations for these carnitine-dependent phenotypes identified, among others, Δcho2 and Δopi3. Cho2p and Opi3p catalyse the sequential methylation reactions in the formation of phosphatidylcholine from phosphatidylethanolamine. Therefore, this study aimed to investigate the relationship between choline, phosphatidylcholine and the carnitine phenotypes. Liquid growth assays of Δcho2 and Δopi3 cultures revealed that addition of choline can restore the protective effects of carnitine against hydrogen peroxide. The connection between the cellular phospholipid composition and the carnitine-dependent shuttleindependent phenotypes was also investigated. Analysis of the lipid composition of cells by LCMS showed that Δcho2 and Δopi3 had a largely different lipid composition compared with the wild type, most notably, a reduction in phosphatidylcholine and an increase in triacylglycerol content were observed for both mutants. These changes were reversed by supplementation with choline. However, no effects on the lipid composition of cells in response to carnitine treatment were observed, either when supplemented alone or in combination with DTT and hydrogen peroxide. Carnitine has also been investigated in mammalian systems for its potential to protect cells from oxidative stress, an effect which would be of benefit in various neurodegenerative disorders. Several studies have documented the positive effects of carnitine against oxidative stress in mammalian cells however the mechanism behind this action remains unknown. It is therefore thought that, provided similar effects for carnitine can be shown in mammalian cells as was observed in yeast, it would be beneficial to use yeast as a model system for the study of the molecular changes induced by carnitine. In view of this, the effects of carnitine on toxicity induced by oxidative stress in mammalian neural cells were compared to that which has been observed in yeast. For this purpose the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) assay, a measure of reductive capacity of cells, was used. However, no effects for carnitine were observed in the MTT assay in combination with either dithiothreitol or paraquat.
AFRIKAANSE OPSOMMING: Vorige studies op gis in hierdie laboratorium het bevind dat karnitien beskermend is teenoor oksidatiewe stres wat deur waterstofperoksied geïnduseer word en ook die nadelige effek van ditiotreitol verhoog. Hierdie fenotipes is gevind om onafhanklik te wees van die rol van karnitien binne die karnitien-pendel. Die sifting vir onderdrukker-mutasies van hierdie karnitienafhanklike fenotipes het onder andere Δcho2 en Δopi3 geïdentifiseer. Cho2p en Opi3p kataliseer die opvolgende metileringsreaksies tydens die vorming van fosfatidielcholien vanaf fosfatidieletanolamien. Hierdie studie het dus gepoog om die verhouding tussen cholien, fosfatidielcholien en die karnitienfenotipes te ondersoek. Vloeistofanalises van Δcho2- en Δopi3-kulture het aangedui dat die byvoeging van cholien die beskermende effekte van karnitien teenoor waterstofperoksied kan herstel. Die verband tussen die sellulêre fosfolipiedsamestelling en die karnitienafhanklike pendel-onafhanklike fenotipes is ook ondersoek. Die analise van die lipiedsamestelling van selle deur middel van LCMS het getoon dat Δcho2 en Δopi3 ‘n grootliks verskillende samestelling het in vergelyking met die wilde tipe, en daar is veral ‘n afname in fosfatidielcholien en ‘n verhoging in triasielgliserol-inhoud vir beide mutante waargeneem. Hierdie veranderinge is omgekeer deur aanvulling met cholien. Geen effekte op die lipiedsamestelling van die selle is egter in reaksie op die karnitienbehandelings waargeneem nie, hetsy toe dit alleen aangevul is of in kombinasie met ditiotreitol en waterstofperoksied. Karnitien is ook in soogdierstelsels ondersoek vir sy potensiaal om selle teen oksidatiewe stres te beskerm, ‘n effek wat groot voordeel sal inhou vir verskeie neurodegeneratiewe steurings. Verskeie studies het reeds die positiewe effekte van karnitien teen oksidatiewe stres in soogdierselle opgeteken, hoewel die meganisme agter hierdie werking nog onbekend is. Daar word dus vermoed dat, gegewe dat soortgelyke effekte vir karnitien in soogdierselle getoon kan word as wat in gis waargeneem is, dit voordelig sou wees om gis as ‘n modelsisteem vir die studie van die molekulêre veranderinge wat deur karnitien geïnduseer word, te gebruik. In die lig hiervan is die effekte van karnitien op giftigheid wat deur oksidatiewe stres in soogdiersenuselle geïnduseer is, vergelyk met dít wat in gis waargeneem is. Om hierdie rede is die 3-[4,5-dimetieltiasool-2-iel]-2,5-difeniel tetrasoliumbromied (MTT) essaiëring, ‘n meting van die verminderende kapasiteit van selle, gebruik. Geen effekte vir karnitien is egter met die MTT essaiëring in kombinasie met óf ditiotreitol óf parakwat waargeneem nie.
Chae, Sung Hee. "Conjugated linoleic acid reduces lipid oxidation in irradiated, cooked ground beef patties." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/5983.
Full textTurner, Nigel. "Membrane lipid composition and its effect on sodium pump molecular activity a comparative study /." Access electronically, 2003. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20041025.154427.
Full textDorrance, Anne McLaren. "Cell membrane lipid composition in relation to physical properties and function : a methodological study." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360931.
Full textEspiritu, Wilma. "The Influence of Lipid Composition on the Binding of LDL to Chondroitin 6-Sulphate." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/943.
Full textFurimsky, Anna M. "Characterization of the lipid composition of washed and percoll gradient centrifuged epididymal mouse sperm." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9396.
Full textHoward, Brandon Daniel. "Shear and Composition Effects on Porous Network Properties and the Permeability of Lipid Films." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593680466745792.
Full textXu, Yuanda. "Thermodynamic and Hydrodynamic Coupling Effects on Compositional Lipid Domains in Membrane Stack Systems." Thesis, Princeton University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10642189.
Full textThis dissertation will focus on my work in biophysics, and my work in mean field games and glucose predictive analysis will not be presented. Several problems relating to the effects of thermodynamic coupling and hydrodynamic coupling within the membrane stack system are discussed. Three theoretical approaches are employed and proposed to study the membrane stack system: a diffuse-interface approach is utilized for numerical simulations; a coarse-grained sharp-interface approach is utilized to provide physical understanding of various kinetics; a hybrid intermediate sharp-interface approach is adopted to study the domain coalescence in the absence of diffusion.
In the first part of the thesis, we discuss the thermodynamic coupling in membrane stack systems. Comprehensive analyses are presented to understand the accelerated coarsening kinetics with respect to single layer and long-range alignment. Numerical simulations are conducted for three systems, namely a diffusion dominated system, an advective interlayer friction dominated system, and an advective membrane viscosity dominated system. Experimental results regarding the advective interlayer friction dominated system are supported by simulations. We investigate the mechanism of the enhanced coarsening kinetics in membrane stack systems and the relationship between the coarsening process and vertical alignment. An intuitive understanding along with analytical explanations are further presented. Moreover, numerical results regarding the critical mixture are also discussed.
We then investigate the interfacial fluctuation behavior within membrane stack systems. The hydrodynamic coupling is found to play a significant role and several physical length scales are found to be crucial. Both a sharp-interface approach and a diffuse-interface approach are employed to numerically simulate decay of interface fluctuations in representative two-membrane systems.
To measure the thermodynamic coupling in experiments, the hydrodynamic force needs to be quantified, especially for the non-circular domains. In the last part of this thesis, the drag coefficient relating domain velocity and force acting on the domain is calculated using perturbation theory within two limits: the first limit refers to a domain much larger than the hydrodynamic screening length; the second limit refers to a domain that is much smaller than the hydrodynamic screening length.
Ariöz, Candan. "Exploring the Interplay of Lipids and Membrane Proteins." Doctoral thesis, Stockholms universitet, Institutionen för biokemi och biofysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102675.
Full textChen, Jia. "Effect of Nitrogen and Phosphorus Enrichment on Lipid and Fatty Acid Composition of Estuarine Microplankton." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539617601.
Full textBuckley, Melanie. "Studies on the effect of interleukin-33 on gene expression and lipid composition of macrophages." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/67679/.
Full textShinde, Suhas, Shivakumar Devaiah, and Aruna Kilaru. "Profiling Abscisic Acid-Induced Changes in Fatty Acid Composition in Mosses." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/4745.
Full textHunter, David Gregory. "The effects of lipid composition and extrusion pressure and temperature on the properties of phospholipid vesicles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24162.pdf.
Full textBerman, Michelle Lea. "Effects of Food Deprivation on Blood Lipid Concentration and Composition in Steller Sea Lions (Eumetopias Jubatus)." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2958.
Full textM.S.
Department of Biology
Arts and Sciences
Biology
Kelso, Karen Anne. "The lipid and fatty acid composition of semen in relation to fertility in the male animal." Thesis, University of Glasgow, 1997. http://theses.gla.ac.uk/2145/.
Full textKingston, Catharine Alison. "The effect of modulating membrane lipid composition on the thermal sensitivity of tumour cells in culture." Thesis, Durham University, 1989. http://etheses.dur.ac.uk/6533/.
Full textGarry, Jennifer Mary Christina. "The effect of dietary n-3 and n-6 PUFA intake on atheromatous plaque lipid composition." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367970.
Full textAlfaia, Cristina Maria Riscado Pereira Mateus. "Contribution to the study of lipid composition and nutritional value of intramuscular fat in ruminant meats." Doctoral thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2009. http://hdl.handle.net/10400.5/1157.
Full textContribuição para o estudo da composição lipídica e do valor nutricional da gordura intramuscular na carne de ruminantes - A composição em ácidos gordos e o ácido linoleico conjugado (CLA) são temas actuais de grande interesse, com particular relevância para a qualidade da carne e saúde humana. As carnes de ruminantes têm sido consideradas alimentos pouco saudáveis, principalmente devido à sua fracção lipídica com elevada concentração em ácidos gordos saturados. Contudo, as gorduras edíveis dos ruminantes são a principal fonte natural de isómeros CLA, sendo os isómeros bioactivos (c9,t11 e t10,c12) associados a propriedades potencialmente benéficas para a saúde humana. Em Portugal, a informação científica disponível para apoiar a qualidade e a reputação da carne bovina de raças autóctones criadas segundo as especificações de Denominação de Origem Protegida (DOP) continua restrita. Para além disso, os dados disponíveis não permitem ter uma percepção global de como distintos factores influenciam a composição da carne, desde a sua produção até ao consumo. Neste contexto, a nossa investigação foi desenvolvida estudando o efeito dos regimes alimentares dos animais (pastagem×concentrado), processamento tecnológico da carne após o abate (irradiação) e tratamentos térmicos (fervura, microondas e grelhagem), no perfil lipídico, especialmente nos isómeros do CLA, e no valor nutricional de carne de ruminantes. Foram seleccionadas e caracterizadas 4 carnes tradicionais DOP (Carnalentejana, Mertolenga, Barrosã e Arouquesa). Os resultados sugerem que a gordura intramuscular das carnes de novilho relativamente às de vitela, apresentam menor valor nutricional ao longo do ano, devido ao sistema de produção semi-extensivo utilizado nos novilhos. Por sua vez, a Carnalentejana-DOP apresenta uma qualidade nutricional superior comparativamente à carne de vaca de produção intensiva. No sentido de avaliar em detalhe o efeito de diferentes regimes alimentares no valor nutricional dos lípidos da carne, bem como a sua utilidade como discriminantes químicos da origem da carne, realizou-se um ensaio controlado. Os dados obtidos reforçam os resultados anteriores que sugeriam que a carne de animais de pastoreio apresenta melhor qualidade nutricional (teores mais elevados de n-3 PUFA e CLA) do que a carne de animais alimentados a concentrado. Este facto traduz os efeitos benéficos da pastagem no perfil de ácidos gordos da carne. Relativamente às alterações na composição da gordura intramuscular, resultantes do efeito de processamentos seguintes ao abate, a irradiação, uma tecnologia prospectiva para a conservação das carnes, não promoveu modificações significativas. Os tratamentos térmicos, frequentemente utilizados em culinária, induziram um impacto moderado no perfil dos ácidos gordos, como consequência das perdas de humidade e concentração da gordura. Em resumo, a composição lipídica da gordura intramuscular das carnes de bovino DOP estudadas apresenta um valor nutricional acrescentado para os consumidores, considerando os valores de n-3 PUFA, CLA (total e do isómero c9,t11) e da razão n-6/n-3, contribuindo para a sua diferenciação no mercado.
RESUMO - Contribuição para o estudo da composição lipídica e do valor nutricional da gordura intramuscular na carne de ruminantes - A composição em ácidos gordos e o ácido linoleico conjugado (CLA) são temas actuais de grande interesse, com particular relevância para a qualidade da carne e saúde humana. As carnes de ruminantes têm sido consideradas alimentos pouco saudáveis, principalmente devido à sua fracção lipídica com elevada concentração em ácidos gordos saturados. Contudo, as gorduras edíveis dos ruminantes são a principal fonte natural de isómeros CLA, sendo os isómeros bioactivos (c9,t11 e t10,c12) associados a propriedades potencialmente benéficas para a saúde humana. Em Portugal, a informação científica disponível para apoiar a qualidade e a reputação da carne bovina de raças autóctones criadas segundo as especificações de Denominação de Origem Protegida (DOP) continua restrita. Para além disso, os dados disponíveis não permitem ter uma percepção global de como distintos factores influenciam a composição da carne, desde a sua produção até ao consumo. Neste contexto, a nossa investigação foi desenvolvida estudando o efeito dos regimes alimentares dos animais (pastagem×concentrado), processamento tecnológico da carne após o abate (irradiação) e tratamentos térmicos (fervura, microondas e grelhagem), no perfil lipídico, especialmente nos isómeros do CLA, e no valor nutricional de carne de ruminantes. Foram seleccionadas e caracterizadas 4 carnes tradicionais DOP (Carnalentejana, Mertolenga, Barrosã e Arouquesa). Os resultados sugerem que a gordura intramuscular das carnes de novilho relativamente às de vitela, apresentam menor valor nutricional ao longo do ano, devido ao sistema de produção semi-extensivo utilizado nos novilhos. Por sua vez, a Carnalentejana-DOP apresenta uma qualidade nutricional superior comparativamente à carne de vaca de produção intensiva. No sentido de avaliar em detalhe o efeito de diferentes regimes alimentares no valor nutricional dos lípidos da carne, bem como a sua utilidade como discriminantes químicos da origem da carne, realizou-se um ensaio controlado. Os dados obtidos reforçam os resultados anteriores que sugeriam que a carne de animais de pastoreio apresenta melhor qualidade nutricional (teores mais elevados de n-3 PUFA e CLA) do que a carne de animais alimentados a concentrado. Este facto traduz os efeitos benéficos da pastagem no perfil de ácidos gordos da carne. Relativamente às alterações na composição da gordura intramuscular, resultantes do efeito de processamentos seguintes ao abate, a irradiação, uma tecnologia prospectiva para a conservação das carnes, não promoveu modificações significativas. Os tratamentos térmicos, frequentemente utilizados em culinária, induziram um impacto moderado no perfil dos ácidos gordos, como consequência das perdas de humidade e concentração da gordura. Em resumo, a composição lipídica da gordura intramuscular das carnes de bovino DOP estudadas apresenta um valor nutricional acrescentado para os consumidores, considerando os valores de n-3 PUFA, CLA (total e do isómero c9,t11) e da razão n-6/n-3, contribuindo para a sua diferenciação no mercado.
This work was co-financed by Centro de Investigação Interdisciplinar em Sanidade Animal (Project CIISA/52.Carne-Bioactivos) da Faculdade de Medicina Veterinária da Universidade Técnica de Lisboa and Fundação para a Ciência e a Tecnologia (POCTI/CVT/2002/44750) and Ministério da Agricultura (AGRO/2003/512).
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Full textStrömstedt, Adam A. "Antimicrobial Peptide Interactions with Phospholipid Membranes : Effects of Peptide and Lipid Composition on Membrane Adsorption and Disruption." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-100966.
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Full textCole, Rachel M. "The effects of fermented soy and soy diets on hepatic lipid composition in zucker (fa/fa) rats." Connect to resource, 2006. http://hdl.handle.net/1811/6601.
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