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  • Articles: DFG German National Licenses  (16)
  • 1990-1994  (9)
  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 9382-9388 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1958-1965 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The lignin content of wood, paper, pulp, or other materials containing lignin (such as filter paper soaked in black liquor) is readily determined by flash pyrolysis of the sample at approximately 550 °C in a reducing atmosphere of hydrogen or in an inert atmosphere of helium followed by a rapid analysis of the product gas by a mass spectrometer. The heated pyrolysis unit as fabricated, comprises a small platinum cup welded to an electrically heated stainless-steel ribbon with control units for programmed short duration (1.5 s, approximately) heating and for continuous flow of hydrogen or helium. The pyrolysis products enter an electron-ionization-mode mass spectrometer for spectral evaluation. Lignin content is obtained from certain ratios of integrated ion currents of many mass spectral lines, the ratios being linearly related to the Kappa number or Klason lignin. The Kappa number can be obtained from a few milligram sample in 3 min which is at least ten times faster than a Kappa number determination by the Standard Chemical Method. The present instrument can measure Kappa numbers in the whole range from 0 to 200 without any readjustments.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 1 (1987), S. 0 
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Experience obtained during post-marketing surveillance of the safety of cimetidine emphasizes the difficulties in interpretation posed by the high background frequency of disease of all types in drug takers. The multiple sources of confounding factors, and their high prevalence, make it impossible to detect adverse events which mimic ordinary disease, particularly when a consistent relationship between adverse event and drug exposure is not observed. The inclusion of controls emphasizes the difficulties but does not ease interpretation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 332-334 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A platinum chromophore, chloro(2,2′:6′,2′′-terpyridine)platinum(II) chloride, previously used in labelling active-site histidines of serine proteases, proves to be a useful reagent in heavy-atom derivatization of protein crystals for X-ray crystallographic phase determination.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 49 (1993), S. 1059-1063 
    ISSN: 1420-9071
    Keywords: Halobacterial ATPase ; archaeal ATPases ; ATP synthesis ; Halobacterium ; Haloarcula ; Haloferax
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The proton-dependent synthesis of ATP was demonstrated in representative members of the generaHalobacterium, Haloarcula, andHaloferax. In all cases, synthesis was not inhibited by nitrate or N-ethylmaleimide, inhibitors of the vacuolar-like ATPase found in Archaea, but was affected by azide, an inhibitor of F0F1-ATP syntheses. These observations extend the earlier observations withHalobacterium saccharovorum and suggest that ATP synthesis in these organisms is brought about by an F0F1-APT synthase.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many factors have been suggested to trigger the activation of lipase at a lipid-water interface. They included increase of substrate concentration at the interface6, better orientation of the scissile ester bond7, reduction in the water shell around the ester molecules In water8 and a ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 24 (1988), S. 196-203 
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Epinephrine-induced platelet aggregation (mediated through interaction with alpha2-adrenoceptors) is inhibited by aspirin. To determine if aspirin modulates alpha2-adrenoceptors, we quantitated dissociation constant (KD) and maximum number of binding sites (Bmax) on isolated platelet membranes using alpha2-antagonist3H-yohimbine in normal subjects given 650 mg of aspirin orally. Alpha2-receptor KD increased from 3.20±1.80 to 7.32±3.32 nM (p〈0.02) and Bmax from 115±77 to 190±140 fmol/mg protein. To determine if these alterations in alpha2-receptors by aspirin were mediated through circulatory or intracellular effects, intact platelets or isolated platelet membranes were incubated with aspirin for 30 minutesin vitro. In thesein vitro experiments, alpha2-receptor KD increased from 2.92±1.76 to 9.83±8.55 nM and Bmax from 140±81 to 191±129 fmol/mg protein (p〈0.05). Oral ingestion of aspirin or incubation of aspirin with intact platelets or lysates increased (3 to 10 fold) the concentration of 1-epinephrine required for inhibition, of3H-yohimbine binding by 50% (p〈0.05). Basal platelet cyclic AMP as well as its elevation with PGE1 or PGI2 and decrease with catecholamines were not influenced by aspirin treatment of platelets. These data indicate that aspirin decreases platelet alpha2-receptor affinity for agonist as well as antagonist. These effects of aspirin are independent of circulatory or dynamic intraplatelet changes.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1106
    Keywords: Cerebral cortex ; GABA neurons ; Parvalbumin ; Calbindin ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Calcium ions play a key role in many aspects of neuronal behavior and certain calcium binding proteins that may influence this behavior are differentially distributed in the central nervous system. In this study it is shown that immunoreactivity for calbindin-28 and for parvalbumin is localized in separate populations of inhibitory GABA interneurons in all areas of the neocortex of Old World monkeys. Virtually all GABA neurosn show immunoreactivity for one or other calcium binding protein but, except for a few cells in layer IV, GABA cells do not show immunoreactivity for both proteins. Among the two cell populations, parvalbumin immunoreactivity characterizes basket neurons while calbindin immunoreactivity characterizes double bouquet neurons. These findings suggest that the two GABA cell types differ in their regulation of calcium homeostasis and may yield clues to their different roles in intracortical circuitry.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 91 (1989), S. 107-113 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution of calbindin in some endocrine glands (thyroid, parathyroid, ultimobranchial body, pituitary and adrenals) and in the diffuse endocrine cells of the gut and pancreas has been investigated immunohistochemically using an antiserum raised against the 28 kDa calbindin from chicken duodenum. The identity of calbindin-immunoreactive cells in a number of avian and mammalian species was ascertained by comparison with hormone-reactive cells in consecutive sections or by double immunostaining of the same section with both calbindin and hormone antibodies. Calcitonin-producing C cells of the mammalian and avian thyroid, parathyroid or ultimobranchial body, PP, glucagon and insulin cells of the mammalian and avian pancreas, enteroglucagon cells of the avian intestine, secretin cells of the mammalian duodenum, histamine-producing ECL cells of the mammalian stomach, as well as noradrenaline-producing cells of the adrenal medulla and some (TSH?) cells of the adenohypophysis were among the calbindin-immunoreactive cells. Although some species variability has been observed in the intensity and distribution of the immunoreactivity, especially in the pancreas and the gut, a role for calbindin in the mechanisms of calcium-mediated endocrine cell stimulation or of intracellular and extracellular calcium homeostasis is suggested.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Immunoreactivity for the calicium binding protein, calbinding D28k has been localized in enterochromaffin-like (ECL) cells of the human stomach. The reactivity was observed with three different antisera, raised against bovine brain, primate brain, and chicken intestinal calbindin. The ECL cells were closed endocrine cells located at the bases of the oxyntic glands. They were not found in other regions of the stomach. No other gastric endocrine cells were reactive with these antisera.
    Type of Medium: Electronic Resource
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