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  • Articles  (70)
  • Articles: DFG German National Licenses  (70)
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  • Articles  (70)
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  • Articles: DFG German National Licenses  (70)
  • Latest Papers from Table of Contents or Articles in Press
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  • Springer  (70)
  • American Chemical Society (ACS)
  • American Society of Hematology
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 26 (1987), S. 165-170 
    ISSN: 1436-6215
    Keywords: lipid peroxidation ; high-density-lipoproteins ; obesity ; oxidized ; cholesterol ; hypercholesterolaemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Bei 70 fettsüchtigen Personen (26 Männer, 44 Frauen) wurden im Blutserum einige Lipidkomponenten und der Gehalt an Malondialdehyd (MDA) vor ihrer Abmagerungskur bestimmt. Aufgrund der klinischen Laborbefunde waren diese Patienten bei der Gruppe der Personen mit Hyperlipo-proteinämie einzuordnen (Einteilung nach Fredricksson und Lees). Bei 32 Personen war der Blutcholesteringehalt hoch (über 5,7 mmol/1), es bestand eine negative Korrelation zwischen MDA und hochdichten Lipoproteinfraktionen (HDL). Der größte Korrelationskoeffizient wurde in der Gruppe II/a bei Hyper-lipoproteinämie festgestellt (HDL-C, r=−0,74; HDL-2-C, r=−0,54; HDL-3-C, r=−0,78). Bei Personen mit normalem Serumcholesteringehalt konnte keine Korrelation nachgewiesen werden. Die Ergebnisse werden mit den durch Lipidperoxidation oxidierten Cholesterin-derivaten, welche die HDL-Synthese mindern, erklärt. Es scheint, daß bei Hyper-cholesterinämie der Fettsüchtigen die Lipidperoxidation beim Rückgang des HDL-Wertes eine bedeutende Rolle spielt und damit also einen wichtigen Schutz gegen kardiovaskuläre Erkrankungen bildet.
    Notes: Summary In the blood sera of 70 obese persons (26 men, 44 women) some lipid components and malondialdehyde (MDA) level were determined before slimming. The people were classified into groups of hyperlipoproteinaemia on the basis of laboratory results, according to Fredrickson and Lees. In 32 people with high blood cholesterol level (above 5.7 mmol) there were negative correlations between MDA and high-density lipoprotein (HDL) fractions. Correlation coefficients were the greatest in the group IIa of hyperlipoproteinaemia (HDL-C. r=−0.74; HDL-2-C. r=−0.54; HDL-3-C. r=−0.78). Correlations were not found in subjects with a normal cholesterol level. The results were attributed to the formation of oxidized cholesterol products, caused by lipid peroxidation, which may decrease the HDL synthesis. It seems that in hypercholesterolaemia coupled with obesity, lipid peroxidation can contribute to the reduction in HDL levels, which is an important protective factor against cardiovascular diseases.
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  • 2
    ISSN: 1420-9071
    Keywords: Ethanol ; peroxisomes ; lipid peroxidation ; alcoholic cardiomyopathy ; rat liver ; rat heart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Chronic ethanol administration was shown to increase catalase and acyl-CoA oxidase activities in rat myocardium but did not alter the activity of liver peroxisomal enzymes. As a result of alcohol consumption a 2–3-fold increase in the level of lipid peroxidation was observed in the heart tissue while in the liver the induction was much less pronounced.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 77 (1987), S. 3-10 
    ISSN: 1573-4919
    Keywords: lipid peroxidation ; antioxidant ; DNA damage ; anticlastogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Liposomal lipid peroxidation and peroxide induced DNA damage were investigated. Inhibition of lipid peroxidation was studied using 400 µM uric acid, β-carotene, ∝-tocopherol, curcumin and butylated hydroxyanisole (BHA). Curcumin, the active principle of turmeric (Curcuma longa), was as effective an antioxidant as BHA. An aqueous extract of turmeric was also found to be an effective inhibitor. The inhibition obtained using this aqueous extract, incorporated into the liposome itself, was 70% at 300 ng/µ1 This indicates the presence of yet another antioxidant in turmeric besides the lipophilic curcumin. The aqueous antioxidant extended 80% protection to DNA against peroxidative injury at 100 ng/µl. This component of turmeric is being characterised and investigated as an antioxidant/anticlastogen and as an antipromoter.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 78 (1987), S. 151-159 
    ISSN: 1573-4919
    Keywords: catalase ; Fe ; free radical ; hydrogen peroxide ; lipid peroxidation ; malondialdehyde ; mercaptopropionylglycine ; microsome ; Na ; K ; ATPase ; renal ischemia ; sulfhydryl ; superoxide dismutase ; thiol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The results of our experiments demonstrated that one hour of ischemia followed by one hour of reflow in the kidney caused a reduction in (Na+K+)ATPase activity and microsomal sulfhydryl content as well as an increase in microsomal lipid peroxidation. Renal venous malondialdehyde concentration was increased soon after reperfusion of the ischemic kidney. All these changes were rectified by an infusion of 0.123 mmol N-(2-mercaptopropionyl)glycine/kg over a 70 min period. On the other hand, an in vitro addition of 0.01–0.5 mM N-(2-mercaptopropionyl)glycine to a membrane preparation in the presence of H202 and Fe3+ did not prevent but rather potentiated the free radical effect on the enzyme activity. However, addition of superoxide dismutase alone or with catalase together with 2-MPG were effective in preventing the enzyme depression induced by H202. The results therefore indicate that free radical generation participates in the evolution of ischemia/reperfusion cell injury and thiol-reducing agents may be beneficial in alleviating the cell damage in vivo.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 148 (1974), S. 69-82 
    ISSN: 1432-0878
    Keywords: Ultimobranchial glands ; Anuran larvae ; Metamorphosis ; Ultrastructure ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of ultimobranchial (UB) gland cells from Rana temporaria larvae 48 h after hatching until the completion of metamorphosis is described. A single UB cell type is present, believed to be the characteristic C cell, in which secretory granules are first detectable in 8 day post-hatching larvae. These secretory granules show an intimate association with lipid droplets. Unusual membranous and crystalloid inclusions, which may represent yolk platelets, are found in UB glands of very small larvae. The significance of a range of UB organelles is discussed and some scanning electron micrographs presented. This report is believed to be the first published ultrastructural and scanning electron microscope study of larval anuran UB glands.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 150 (1974), S. 389-397 
    ISSN: 1432-0878
    Keywords: Choroid plexus ; Human fetus ; Modifications during development ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructural organization of the human fetal choroid plexus was assessed with scanning electron microscopy. The membranous modifications of choroidal ependymal cells differ remarkably between 11 and 20 weeks of intrauterine development and suggest a variable functional capacity at different times of ontogenesis. Based upon existing data coupled with the ultra-architectural organization of cilia, clavate and linear microvilli are seen with scanning electron microscopy, a multiple functional role is hypothesized for choroidal ependymal cells.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 153 (1974), S. 151-165 
    ISSN: 1432-0878
    Keywords: Taste buds ; Fishes ; Chemoreceptors and Mechanoreceptors ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Within the epithelium of the head gut of the sword-tail (Xiphophorus helleri Heckel) there are three types of taste buds that can be identified with certainty in the scanning electron microscope. The breathing valves, which are situated behind the mouth region, bear relatively high epidermal papillae in which type I taste buds can be found. The middle region of the head gut is mostly occupied by low epidermal papillae containing type II taste buds. Type III taste buds are present within the metabranchial head gut; they never rise above the normal level of the epithelium. Taste buds of each type show two kinds of receptor villi within their receptor areas: tall villi (about 1,5×0,5 μm) and small villi (about 0.5×0.2 μm). A few tall villi belonging to solitary chemosensory cells are situated between the superficial epithelial cells of the tongue. In addition, the surface of the epidermal cells shows a delicate microridge system.—It is postulated that the taste buds of different types serve different functions: Taste buds within epidermal papillae may act both as chemoreceptors, and mechanoreceptors. Taste buds that never rise above the normal level of the epithelium perhaps act predominantly as chemoreceptors.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 148 (1974), S. 83-96 
    ISSN: 1432-0878
    Keywords: Sharpey fibre bone ; Collagen orientation ; Mineralization ; Mammals ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sharpey fibre bone specimens from cranial sutures and muscle attachment sites of rhesus monkeys and rats, and tooth sockets of several mammals (man, rhesus monkey and rat specimens mainly) were fixed, and either dried by critical point drying or freeze drying, or made anorganic with 1,2 ethane diamine or sodium hypochlorite, washed and airdried. The bone was examined by scanning electron microscopy. The packing density of the extrinsic fibres affected their cross sectional shape, the well separated fibres being the most uniform. Long parallel rows and groups of extrinsic fibres were observed. The fibre units that made up the Sharpey fibre bundles were sometimes distinct and mineralized as units. Mineralization was generally similar to the varied patterns encountered in root cementum. The diameters of the extrinsic fibres were similar at all sites and in all species; those in socket bone differed little from those in cementum. The intrinsic fibre orientation, although constant over fairly large areas, showed no consistent relation to the direction of entry of the extrinsic fibres. We would like to thank Mrs. E. Bailey and Mr. P. S. Reynolds for technical assistance.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 147 (1974), S. 149-156 
    ISSN: 1432-0878
    Keywords: Sensorysur face ; Tentacles ; Sea anemones ; Corals ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Examination of the sensory surface of the tentacles of sea anemones and corals prepared by the Freon critical-point method has revealed three primary structures: ciliary cones consisting of a cilium surrounded by a cluster of shorter stereocilia, single long cilia, and microvilli. The ciliary cones occur on, and the single cilia and microvilli occur both on and between, the nematocyst- and spirocyst-bearing regions of the tentacles. The similarity of the anthozoan ciliary cones to the ciliary sensory structures in the lateral line, and the auditory and vestibular organs of vertebrates is noted and the possible functional significance of the coelenterate structures is discussed.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 147 (1974), S. 163-167 
    ISSN: 1432-0878
    Keywords: Articular cartilage ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Samples of articular cartilage from four different human joints were obtained at surgery. Serial scanning electron micrographs taken at a magnification of 1000× were used to reconstruct an 0.25 mm2 area of articular surface. Within these given areas both normal and degenerated portions were seen. This study supports the concept that the surface morphology of articular cartilage varies from joint to joint and from area to area within a joint. This information should be useful for the interpretation of light and electron micrographs, as well as histochemical and biochemical data.
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