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  • Articles  (25)
  • Articles: DFG German National Licenses  (25)
  • 2000-2004  (15)
  • 1950-1954  (10)
  • Biology  (25)
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  • Articles  (25)
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of a swallow homologue from Drosophila pseudoobscura (2000)
    Springer
    Development genes and evolution 210 (2000), S. 157-161 
    Details
    ISSN: 1432-041X
    Keywords: Key words Swallow ; bicoid ; Drosophila ; mRNA localization ; Oogenesis ; Embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We analyzed a functional homologue of the swallow gene from Drosophila pseudoobscura. The swallow gene of D. melanogaster plays an essential role in localizing bicoid mRNA in oocytes, and swallow mutant embryos show anterior pattern defects that result from the lack of localization of the bicoid morphogen. The pseudoobscura homologue rescues the function of swallow mutants when introduced into the genome of D. melanogaster, and its expression is similar to that of the melanogaster gene. The predicted pseudoobscura and melanogaster proteins are 49% identical and 69% conserved. The coiled-coil domain previously identified in the melanogaster swallow protein is strongly conserved in the pseudoobscura homologue, but the weak similarity of the melanogaster swallow protein to the RNP class of RNA-binding proteins is not conserved in the pseudoobscura homologue. These and other observations suggest a structural role for swallow in localizing bicoid mRNA, perhaps as part of the egg cytoskeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050023
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  • 2
    Electronic Resource
    Electronic Resource
    Caution in the Use of Liquid Propane for freezing Biological Specimens (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 235-235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On one occasion when I was slowly condensing propane in a flask chilled with liquid nitrogen, I obtained what appeared to be such a mixture : that is, I obtained two distinct layers of liquid in the flask, one of which had the characteristic appearance of liquid oxygen. This experience suggested ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174235b0
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  • 3
    Electronic Resource
    Electronic Resource
    Presence and Absence of the Pre-Natal Check in Lambs' Birthcoats (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 878-879 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sickle-fibres constitute the most easily perceived evidence of the pre-natal check3-5. Of ten N/ + Aggrade lambs studied in a number of body regions, all had sickle-fibres on the shoulder patch and shoulder, and they were present on several necks, withers, sides and o backs, but not on any ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173878b0
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  • 4
    Electronic Resource
    Electronic Resource
    Possible Role of Proteolytic Enzymes in Protein Synthesis (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 1024-1025 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As a test of this hypothesis, Hendler and Green-berg5 have recently studied the metabolism of labelled y-glutamyl-glycine; but they found that this particular compound is not significantly involved in any of several living systems that incorporate amino-acids into proteins. The evidence presented ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1711024a0
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental Determination of the Life-times of Atomic Resonance States (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 112-112 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Further work is progressing with the view of adapting the method to molecular transitions, and the results will be reported at a later date. Atom Transition Wave-length Life-time (sec.) Na 32S-32P 5896, 5890 A. 1.61 0.06 x 10-8 K 42S-42P 7699, 7665 2.71 0.09 x 10-8 Rb 52S-52P 7947, 7800 2.81 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167112a0
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  • 6
    Electronic Resource
    Electronic Resource
    Masses of Fundamental Particles (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 655-656 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Putting M%(MiMt\ = (137/2)2 (137 = and substituting for M2 the proton mass 1836'56, it is found that M± is 1839-08; this is in excellent agreement with the experimental value of 1839-05 for the neutron mass. The mass values of the TT- and (jt-mesons do not fit unless we put M2(M1~M2) = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166655a0
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Posterior Pituitary Extract and its Fractions on Renal Electrolyte Excretion (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 189-189 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some observations on this subject have been recently published by O. Schaumann3'4, who investigated the action of oxytocin and of vasopressin on the renal excretion of chloride, sodium and potassium ions in rats. We have been engaged in similar experiments. The effect of small doses (3 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165189a0
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  • 8
    Electronic Resource
    Electronic Resource
    Life-time of the Lithium Atomic Resonance States (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 156-156 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Ladenburg absorption formula3 relating the integral of the absorption coefficient over the whole line to the Einstein transition probability coefficient Anm may be conveniently put in the form loge(I0/IV)dl(1)pNƒe2ll02/mc2 (1) where N is the number of normal atoms of absorbing vapour per ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167156a0
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  • 9
    Electronic Resource
    Electronic Resource
    Masses of Fundamental Particles (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 1018-1018 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Substituting for M% the present value 1837 '56 m for the mass of the neutral hydrogen atom, it is found that MX is 1839-08 m, in excellent agreement with the experimental neutron mass 1839-05 m. This simple relation between the neutron and hydrogen atom is consistent with Eddington's1 concept of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1651018c0
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  • 10
    Electronic Resource
    Electronic Resource
    Oscillator Strength of the Na 2 1 Σ— 1 Σ Transitions (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 191-192 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166191b0
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