Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 115 for “"Sterols"”.
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Isolation of the sterols of dehydrated alfalfa meal
Call number: LD2668 .T4 1950 S663
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Synthesis and cytotoxity of oxysterols:studies on the A,B ring polyoxygenated sterols
Oxysterols (OS), the polyoxygenated sterols, represent a class of potent regulatory molecules for important biological actions. Cytotoxicity of OS is one of the most important aspects in studies of OS bioactivities. However, studies, the structure-activity relationship (SAR) study in particular, …
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Structure and Dynamics of Biomembranes containing Cholesterol and other Biologically-Important Sterols : a computational perspective
… differential effects of three closely-related sterols: ergosterol, cholesterol and lanosterol on the structural and dynamical properties of a model dipalmitoyl phosphatidylcholine (DPPC) membrane were examined using Molecular Dynamics (MD) simulations and Neutron Scattering (NS) calculations. …
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The Influence of Incorporated Cholesterol Auto-Oxides Upon The Permeability and Fluidity of Multilamellar Vesicles (Oxidized Sterols)
… The cholesterol B ring substituted sterols (the triol, epoxide, hydroperoxide and 7-ketone) exhibited increases in glucose permeability over cholesterol multilamellar vesicles at 33 and 49 mol%, while the side chain sterol oxide, 25-hydroxycholesterol, exhibited a large increase in …
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Effects of kinetin on distribution and exudation of free sterols and free fatty acids in Arachis hypogaea L. 'Argentine' under axenic conditions
… 10⁻⁴M) on distribution of free fatty acids and sterols in plant parts and root exudates of 57-day-old peanut plants grown in nutrient solutions under gnotobiotic conditions was studied. Kinetin was applied to the roots in the culture medium five days before harvest. Upon harvesting root exudates …
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Determination of bioactive and potentially toxic compounds in food: raw material analysis and shelf life evaluation
… such as n-3 fatty acids, tocopherols and sterols. Phenolic compounds, tocopherols and sterols are present in all plants and have been studied extensively in cereals, nuts and oil. n-3 fatty acids are present in fish and all around the vegetable kingdom. The aim of the present work was the …
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Investigating the Putative Diagenetic Origins for Neoproterozoic Sponge Steranes
… via methyl migrations from and to C29 algal sterols. Here, we examine the suggested diagenetic production of 24-ipc from algal sterols based on geologically plausible diagenesis experiments in order to further understand the preservation pathways of algal sterols. We find that, while 24-ipc …
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The Influence of Age and Sterol-Inhibiting Fungicides on the Sterol and Steryl Ester Composition of SIF Sensitive and Tolerant Non-Target Chlorella Species
… and permeability. Of the two main types of sterols in plants, free sterols (FSs) are thought to be incorporated into membranes while conjugated sterols such as steryl esters (SEs), hypothetically, regulate homeostasis by inserting or removing FSs from cell membranes under changing …
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HEPATIC LIPID METABOLISM: THE ROLES OF ACAT2 AND ABCG5/G8 IN THE DEVELOPMENT AND PREVENTION OF DISEASE
… complex that transports intracellular free sterols to bile or the intestinal lumen. Data are presented to show that transgenic over-expression of G5G8 does not affect the NAFLD phenotype in ACAT2 modified mice. Disruption of G5G8 in mice replicates the rare autosomal recessive human disease …
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Influence of osmotic stress, ethanol, and a substituted pyridazinone, BAS 13-338, on the growth and lipid composition of two Chlorella species
… esters and decreasing levels of polar lipids and sterols as osmotic concentrations increased. Polar lipids, triglycerides, and sterols declined in C. pyrenoidosa while steryl esters remained constant. Ratios of free sterols to polar lipids were 10-fold greater in C. pyrenoidosa and were unaffected …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
… traps it is found that the distribution of the sterols esterified to pyropheophorbide-a change with season and that the sterols esterified are related to the distribution of sterols synthesized by the phytoplankton living in the photic zone at the time of production. Analysis of …
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Biogeochemical applications of compound-specific radiocarbon analysis
… n-alcohols, C30 mid-chain ketols and diols, sterols, hopanols, and ether-linked C4o-biphytanes of Archaea. The data show that the carbon source for most of the biomarkers is marine euphotic zone primary production or subsequent heterotrophic consumption of this biomass. Two lipid classes …
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Sterol requirements in Drosophila melanogaster
… not synthesize sterol, it nevertheless requires sterols to complete development. Moreover, Drosophila normally incorporates sterols into cell membranes. Thus, dietary sterol depletion can be used to specifically reduce membrane sterol levels. In contrast, vertebrates do synthesize cholesterol. In …
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Biogeochemical applications of compound-specific radiocarbon analysis
… n-alcohols, C30 mid-chain ketols and diols, sterols, hopanols, and ether-linked C40-biphytanes of Archaea. The data show that the carbon source for most of the biomarkers is marine euphotic zone primary production or subsequent heterotrophic consumption of this biomass. Two lipid classes …
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CHEMICAL AND ENZYMATIC INVESTIGATIONS OF THE MECHANISM OF THE REMOVAL OF THE 14ALPHA-METHYL GROUP OF LANOSTEROL
… 14(alpha)-hydroxymethyl, and 14(alpha)-hydroxy sterols were prepared by chemical synthesis for use in investigations of the mechanism of the enzymatic removal of the 14(alpha)-methyl group (carbon atom 32) of lanosterol during the biosynthesis of cholesterol. A comparison of the in vitro …
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Characterizing the Interaction of the ATP Binding Cassette Transporters (G subfamily) with the Intracellular Protein Lipid Environment
… influence ABC-transporter mediated movement of sterols. Specifically, we expressed murine ABCG1 (mABCG1) in yeast and assessed how changes in the intracellular sterol environment affect movement of sterols by this transporter. We found that expression of mABCG1 is able to vary (both increase and …
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Elucidation of the mycosamine dependent sterol binding and antifungal activities of amphotericin B
… that is dependent on the presence of membrane sterols to exert its biological activity. This natural product has been shown to form ion channels in model membrane systems and therefore represents a molecule with the capacity to perform protein-like function, i.e. the formation of a …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΟΥ ΕΞΕΥΓΕΝΙΣΜΟΥ ΥΨΗΛΟΒΑΘΜΩΝ ΠΥΡΗΝΕΛΑΙΩΝ
… ARE PARTLY DECOLORIZED. DURING THE DEGUMMING THE STEROLS ARE REMOVED WITH THE GUMS, MAINLY STIGMA STEROL. DURING THE NEUTRALIZATION OF UNDEGUMMED OILS THE REMOVEMENT OF STEROLS IS LARGE, MAINLY B-SITOSTEROL AND STIGMASTEROL. BUT DURING THE NEUTRALIZATION OF OILS THE REMOVEMENT OF STEROLSIS SMALL, …
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Characterization of the first steryl ester transporter in biology, Yol075c, and its pleiotropic effects
… and mediated by the ABC transporter Yol075c. Sterols are synthesized in the ER and are bound for one of two fates, either free or esterified. Sterols being metabolically expensive to produce and toxic in high quantities may be esterified with a fatty acid and stored in an inert form inside the …
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