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  • Lipids
  • Medicine  (30)
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  • Articles  (30)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Free Radical Biology and Medicine 10 (1991), S. 195-200 
    ISSN: 0891-5849
    Keywords: Arachidonic acid ; Assay ; Endocyclization ; Free Radical ; Lipids ; Mass Spectrometry ; Peroxidation ; Prostaglandin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Free Radical Biology and Medicine 5 (1988), S. 95-111 
    ISSN: 0891-5849
    Keywords: Antioxidants ; Benzo(a)pyrene ; Carcinogens ; Diet ; Lipids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 46 (1990), S. 579-585 
    ISSN: 1420-9071
    Keywords: Lipids ; phospholipids ; galactolipids ; fatty acids ; transfer ; binding ; membranes ; mitochondria ; chloroplasts ; biogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Plant cells contain cytosolic proteins, called lipid transfer proteins (LTP), which are able to facilitate in vitro intermembrane transfer of phospholipids. Proteins of this kind from three plants, purified to homogeneity, have several properties in common: molecular mass around 9 kDa, high isoelectric point, lack of specificity for phospholipids, and binding ability for fatty acids. The comparison of their amino acid sequences revealed striking homologies and conserved domains which are probably involved in their function as LTPs. These proteins could play a major role in membrane biogenesis by conveying phospholipids from their site of biosynthesis to membranes unable to form these lipids. Immunochemical methods were used to establish an in vivo correlation between membrane biogenesis and the level of LTP or the amount of LTP synthesized in vitro from mRNAs. The recent isolation of a full-length cDNA allows novel approaches to studying the participation of LTPs in the biogenesis of plant cell membranes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 24 (1977), S. 127-133 
    ISSN: 1432-0827
    Keywords: Dental pulp ; Dentin ; Phospholipids ; Fatty acids ; Lipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary When bovine dental pulp was removed from erupted and unerupted molars the odontoblasts remained attached to the predentin-dentin shell, from which the soft, partially calcified predentin layer was removed for lipid analysis. The phospholipid and fatty acid composition of phospholipids and neutral lipids were the same in undemineralized bovine predentin from both erupted and unerupted calf molars. The major phospholipids present were phosphatidylcholine (52–56% of the total phospholipids) and ethanolamine phosphoglycerides (22–23%). About 10% of the ethanolamine phosphoglycerides were plasmalogens. The major fatty acids observed were palmitic, stearic, oleic, linoleic, and arachidonic acids. The phospholipid composition of predentin was different from that of undemineralized dental pulp. Predentin contained a significantly higher percentage of phosphatidylserine and sphingomyelin than dental pulp. The fatty acid profiles of the individual phospholipids in the bovine predentin layer were also determined, and for the most part they were comparable to similar comparisons made for other tissues. Predentin sphingomyelin contained only about 6% of 24-carbon fatty acids, which is a relatively low amount compared to sphingomyelin in most other tissues. The fatty acid compositions of predentin neutral lipids and phospholipids were similar to the compositions of dental pulp lipids, but both types of predentin lipids contained more docosapolyenoic acids. The phospholipid and fatty acid compositions of predentin lipids were different from those in human and rat dentin which have been reported by others.
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Pharmacology, Biochemistry and Behavior 48 (1994), S. 377-382 
    ISSN: 0091-3057
    Keywords: Cortisol ; Lipids ; Lipoproteins ; Physical exercise ; Stress ; Testosterone
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-0832
    Keywords: Aspergillus fumigatus ; Essential oil ; Growth ; Lipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Addition of the essential oil ofHyssopus officinalis to the culture medium ofAspergillus fumigatus induced alterations in both growth and lipid composition of this mould. Total lipids and sterols were reduced, whereas total phospholipids were increased. There were alterations in the proportions of fatty acids, neutral lipid and phospholipid fractions.
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  • 7
    ISSN: 1573-0832
    Keywords: Amphotericin B ; Cryptococcus neoformans ; Lipids ; Sterols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Cells of five strains ofCryptococcus neoformans were obtained for partial analysis of lipid composition. Quantitative analysis of lipids and sterols were completed, as well as qualitative analysis of sterols by thin-layer chromatography and by the ultraviolet spectra. Such determinations were made on cells cultured in the absence and presence of amphotericin B at sub-MIC (minimal inhibitory concentration) levels. Marked alterations of the lipid and sterol contents were observed in the amphotericin B — treated cells. Moreover, ergosterol disappeared in these antibiotic-exposed cells. It is concluded that amphotericin B altered the lipid profiles, especially sterols ofC. neoformans.
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  • 8
    ISSN: 1573-0832
    Keywords: Fonsecaea pedrosoi ; Morphogenesis ; Carbohydrates ; Lipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The carbohydrate and lipid components of mycelium and conidia ofFonsecaea pedrosoi (Brumpt) were analysed by paper, thin-layer and gas-chromatography, mass spectrometry and ultraviolet spectroscopy. Glucose, mannose, galactofuranose, rhamnose and glucosamine were polysaccharide components identified inF. pedrosoi. Significant changes in the carbohydrate pattern occurred during the conversion of mycelium into conidia. Rhamnose was predominant in conidia whereas galactose was prominent in mycelium. Palmitic, stearic, oleic, linoleic, and arachidonic acids were the fatty acids identified in the total lipid fraction. Palmitic and oleic acids were major fatty acids. Marked alterations in the fatty acid constituents were observed between the cell types ofF. pedrosoi. Arachidonic acid was detected only in conidia and linoleic acid was preferentially identified in mycelium. Differences in the sterol composition was also associated with morphogenesis inF. pedrosoi. Two main sterols, ergosterol and another less polar sterol, not fully characterized, were found in mycelium whereas in conidia only the latter sterol was present.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 46 (1990), S. 569-579 
    ISSN: 1420-9071
    Keywords: Lipids ; membranes ; transport ; organelles ; vesicles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A major deficit in our understanding of membrane biogenesis in eukaryotes is the definition of mechanisms by which the lipid constituents of cell membranes are transported from their sites of intracellular synthesis to the multiplicity of membranes that constitute a typical cell. A variety of approaches have been used to examine the transport of lipids to different organelles. In many cases the development of new methods has been necessary to study the problem. These methods include cytological examination of cells labeled with fluorescent lipid analogs, improved methods of subcellular fractionation, in situ enzymology that demonstrates lipid translocation by changes in lipid structure, and cell-free reconstitution with isolated organelles. Several general patterns of lipid transport have emerged but there does not appear to be a unifying mechanism by which lipids move among different organelles. Significant evidence now exists for vesicular and metabolic energy-dependent mechanisms as well as mechanisms that are clearly independent of cellular ATP content.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 14 (1974), S. 275-281 
    ISSN: 1432-0827
    Keywords: Calcification ; Cartilage ; Lipids ; Membranes ; Vesicles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les vésicules matricielles sont des particules extracellulaires, entourées par une membrane, qui sont nombreuses dans la matrice du cartilage en voie de calcification et qui sont en rapport morphologique avec le dépôt minéral. Les vésicules matricielles et les cellules de l'épiphyse d'os longs d'embryons de veaux sont libérées par digestion grâce à la collagénase et séparées par centrifugation différentielle. Les vésicules ainsi obtenues sont riches en lipides et contiennent significativement plus de sphingomyéline et phosphatidyl sérine que les fractions cellulaires. Le rapport moles de cholestérol sur moles de phospholipides totaux est plus élevé dans les vésicules que dans les cellules; ce résultat est en accord avec l'origine des vésicules au niveau des membranes cellulaires des chondrocytes.
    Abstract: Zusammenfassung Matrixvesikel sind extrazelluläre, membrangebundene Teilchen, welche in der Matrix von verkalkendem Knorpel gehäuft vorkommen und welche in morphologischem Zusammenhang mit der Mineralablagerung in diesem Gewebe stehen. Matrixvesikel und Epiphysenzellen aus Röhrenknochen von Kalbsembryonen wurden mittels Collagenaseverdauung freigesetzt und durch Differential-Zentrifugierung getrennt. Die Vesikelpräparate waren reich an Lipidien und enthielten bedeutend mehr Sphingomyelin und Phosphatidylserin als die Zellfraktionen. Das molare Verhältnis Cholesterol/Gesamtlipide war in den Vesikeln höher als in den Zellen; dieser Befund stimmt mit der Tatsache überein, daß die Vesikel ihren Ursprung in den Plasmamembranen der Chondrozyten haben.
    Notes: Abstract Matrix vesicles are extracellular, membrane-bounded particles which are abundant in the matrix of calcifying cartilage and which are morphologically related to the deposition of mineral in this tissue. The matrix vesicles and cells of the epiphyses of the long bones of fetal calves were liberated by digestion with collagenase and separated by differential centrifugation. Vesicle preparations were found to be lipid-rich and to contain significantly more sphingomyelin and phosphatidyl serine than cellular fractions. The ratio, moles cholesterol to moles total phospholipid, was higher in vesicles than in cells, a finding which is consistent with vesicles having their origins in the plasma membranes of the chondrocytes.
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