Search Results - (Author, Cooperation:D. B. Fisher)

Showing 1 - 5 results of 5, query time: 0.15s Refine Results
  1. 1
    Staff View
    Publication Date:
    2013-07-28
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2013-12-10
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Fisher, D. B. ; Kaufman, S.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1972
    Staff View
    ISSN:
    1471-4159
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    Abstract— The Km for oxygen for rat liver phenylalanine hydroxylase depended on the structure of the reduced pterin cofactor. When the synthetic cofactor, 6,7-dimethyltetrahydropterin, was employed, the apparent Km for oxygen was 20%. When the natural cofactor, tetrahydrobiopterin, was used, the apparent Km for oxygen was 0.35 %. Substrate inhibition (40 per cent inhibition at 43% oxygen) was observed with the natural cofactor but not with the synthetic cofactor. Oxygen also caused substrate inhibition with bovine adrenal medulla and brain tyrosine hydroxylases. The inhibition was more dramatic in the presence of the natural cofactor than with the synthetic cofactor. Substrate inhibition by oxygen of brain tyrosine hydroxylase may explain the lowered brain levels of norepinephrine and dopamine observed after treatment of animals with hyperbaric oxygen.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Wright, J. P. ; Fisher, D. B. ; Mittler, T. E.
    Springer
    Published 1985
    Staff View
    ISSN:
    1570-7458
    Keywords:
    Myzus persicae ; aphids ; feeding rate ; artificial diet ; inulin
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Description / Table of Contents:
    Zusammenfassung Junge aptere Adulte von Myzus persicae wurden auf künstlicher Diät mit oder ohne Zugabe von radioktiv markiertem Inulin (3H, 100 μCi pro ml; 84.5 cpm pro nl) gehalten. Die Radioaktivität der Blattläuse und ihrer ausgeschiedenen Honigtautropfen wurde in Zeitintervallen nach der Fütterung bestimmt. Die Ergebnisse zeigen, dass Inulin nur in geringer Menge von den Blattläusen absorbiert wird, und, dass die Radioaktivität der ausge schiedenen Honigtautropfen nach Zugabe von 3H-Inulin zur künstlichen Diät ein verlässliches Mass für das Volumen der von ihnen aufgenommenen Nahrung ist.
    Notes:
    Abstract The radioactivity of the honeydew droplets excreted by young apterous adults of the green peach aphid, Myzus persicae, fed on an artificial diet containing 3H-inulin was a reliable measure of the volume of food ingested by the insects, since almost none of the ingested inulin was absorbed and retained by the insects.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1420-9071
    Keywords:
    Cicadellidae ; Delphacidae ; Homoptera ; leafhoppers ; mollicutes ; planthoppers ; Spiroplasma
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Medicine
    Notes:
    Abstract Insect-transmitted plant pathogens can have positive, negative or no effects on the vector insect. Effects could be direct (caused by the pathogen) or indirect (mediated by changes in the plant). Pathogen effects on non-vector insects are less well known.Peregrinus maidis (Ashmead) (Homoptera: Delphacidae), an insect that is not a vector of the corn stunt spiroplasma (CSS), weighed less 15 days after feeding on CSS-infected corn plants relative to insects feeding on healthy corn plants. Fecundity of non-vector insects that were removed from diseased plants was higher than for insects coming from healthy plants. ForDalbulus maidis (DeLong & Wolcott) (Homoptera: Cicadellidae), an insect that transmits CSS, there were no differences in weight, longevity, eggs per day, weekly or total fecundity after feeding on healthy or on CSS-infected corn plants. Significant differences in some phloem amino acids were detected between healthy and CSS-infected plants. Infected plants also showed an increased phloem acidity as disease symptoms progressed. Feeding on CSS-infected corn plants by an insect that does not vector the pathogen infecting the plant can have favorable consequences as evidenced by an increased fecundity.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses