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  • 1
    Electronic Resource
    Electronic Resource
    Is Lysolecithin an In Vivo Constituent of Chromaffin Granules? (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 41 (1983), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: It was recently claimed that lysolecithin (lysophosphatidylcholine) in chromaffin granules is a postmortem artefact. We have, therefore, determined catecholamine/lysolecithin ratios in adrenal tissues and isolated chromaffin granules. In rat adrenals and bovine medulla the ratios in both tissues and granules were similar. This indicates that even in rapidly frozen rat adrenal glands, sufficient lysolecithin is present in the total tissue to account for its presence in isolated organelles. Owing to the high cortex/medulla ratios such studies cannot be performed with guinea pig or rabbit adrenals. However, isolated chromaffin granules from guinea pig, in contrast to a previous study, do contain lysolecithin. We conclude that lysolecithin is an in vivo constituent of chromaffin granules of all species so far investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1983.tb00848.x
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of brachyl oxide (1971)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 19 (1971), S. 1115-1117 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60178a031
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  • 3
    Electronic Resource
    Electronic Resource
    Role of PACAP in the Regulation of Gastrointestinal Motility (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 805 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17497.x
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of Novel Growth-related Genes Linked to the Mitogenic Effect of PACAP on the Rat Pancreatic Acinar Cell Line, AR4-2J (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 805 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17554.x
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  • 5
    Electronic Resource
    Electronic Resource
    γ and X rays from the zodiacal dust (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 723-725 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Idealised mass density as a function of grain size of the zodiacal dust. This was adapted from Giese and Griin's6 maximum model. The abscissa shows particle radii for two different assumed grain material densities; also indicated is the corresponding grain mass. This graph shows that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278723a0
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  • 6
    Electronic Resource
    Electronic Resource
    Distance limit for a class of model γ -ray burst sources (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 525-527 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some of the available spectral burst data3"8 show a significant flux of photons in the 〉 1 MeV range3"5-8. The 27 April 1972, event observed by Apollo 16 (ref. 3) shows at higher energies a power law spectrum with a possible line feature around 4 MeV. However, power law spectra and lines cannot ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271525a0
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  • 7
    Electronic Resource
    Electronic Resource
    Pyridine nucleotide pool size changes in iron-deficient Plantago lanceolata roots during reduction of external oxidants (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 98 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The involvement of pyridine nucleotides in the reduction of extracytoplasmatic electron acceptors by iron-deficient Plantago lanceolata L. roots has been examined by measuring the changes in NAD(P)H and NAD(P)− induced by various external acceptors. Exposure of the plants to FeEDTA, ferricyanide, ferric citrate or hexachloroiri-date resulted in a transient decrease in NADPH and an increase in NAD−. No major differences in this pattern were observed between acceptors which were assumed to be reduced by different enzymes. The application of the membrane-permeable oxidant nitro blue tetrazolium led to similar changes in reduced and oxidized pyridine nucleotides and decreased the reduction of external acceptors. The amino acid analog p-fluorophenylalanine caused a transient decline in both NADPH level and NADPH/ NADP− ratio and a decrease in the ratio of NADH to NAD− without affecting the level of NADH. Exposure of the plants to the translation inhibitor cycloheximide increased both NADH and NADPH concentrations. A comparison of the redox activities and pyridine nucleotide fractions after inhibitor treatment revealed that the constitutive, but not iron stress-induced redox activity correlates with NADPH levels. These results are interpreted as confirming that the redox systems on the root plasma membrane are separately regulated. Possible metabolic reactions during the reduction processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00695.x
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  • 8
    Electronic Resource
    Electronic Resource
    Reduction of root iron in Plantago lanceolata during recovery from Fe deficiency (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 98 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Changes in root-associated Fe(III) reductase activity and Fe concentration during recovery from temporary iron starvation were investigated in hydroponically grown Plantago lanceolata L. Within two days, interruption of the Fe supply resulted in enhanced rates of reduction by intact plant roots. Transfer of iron deficient plants to a solution containing various amounts of chelated Fe caused a transient increase in reduction activity before the rates declined to a level determined by the amount of Fe added. Repression of root-associated redox activity was independent of the Fe concentration in the preculture. When iron deficient plants were submitted to a supply of Fe localized to a part of the root system (split-root plants), the decrease in reduction rates was much more pronounced in the Fe-deprived portion of the roots than in the Fe-supplied one. No correlation was observed between root Fe concentration and Fe(III) reductase activity. Continued growth of split-root plants in the +Fe/-Fe regime increased the reduction rates of the +Fe-grown portion of the root system over the rates in iron sufficient plants with non-divided roots. The results are discussed in relation to putative factors mediating intra- and interorgan regulation of iron nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb05715.x
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  • 9
    Electronic Resource
    Electronic Resource
    Iron stress-induced redox reactions in bean roots (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Iron stress-induced and constitutive redox activity of bean (Phaseolus vulgaris L. cv. Delinel) roots was measured on intact plants using FeEDTA and ferricyanide as electron acceptors. The presence of the translation inhibitor cycloheximide caused a decrease in the reduction of both oxidants. However, a differential decline in the reduction rates of FeEDTA and ferricyanide was observed, suggesting enzyme heterogeneity. In the presence of the H+ -ATPase inhibitor vanadate, the reduction of FeEDTA was nearly completely suppressed in both Fe-deficient (–Fe) and Fe-sufficient (+Fe) plants, providing evidence for an involvement of plasma membrane-bound ATPase activity in the regulation of the reduction process. The inhibition of the ferricyanide reduction by vanadate was restricted to –Fe plants.The data are interpreted in terms of simultaneous operation of distinct redox systems in roots of iron-deficient bean plants. The role of proton extrusion in iron stress-induced electron transfer is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05197.x
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous Approximation in Positive Characteristic (2000)
    Springer
    Monatshefte für Mathematik 131 (2000), S. 15-28 
    Details
    ISSN: 1436-5081
    Keywords: 2000 Mathematics Subject Classification: 11J61 ; 11J13 ; Key words: Simultaneous approximation ; non-archimedean absolute values
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract.  Let be the approximation exponent of a power series α (so that when α is algebraic of degree d, then by Dirichlet’s and Liouville’s Theorems). If the characteristic is positive, q is a power of the characteristic, and are related by a fractional linear transformation with polynomial coefficients, then by respective work of Voloch and of de Mathan, there are constants such that has no solution if , and infinitely many solutions if . We will formulate and prove generalizations to simultaneous approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006050070021
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