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  • Articles  (11)
  • Articles: DFG German National Licenses  (11)
  • Nature Publishing Group  (9)
  • Blackwell Publishing Ltd.  (1)
  • Blackwell Science, Ltd  (1)
  • 2000-2004  (2)
  • 1950-1954  (9)
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  • Articles  (11)
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  • Articles: DFG German National Licenses  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    MicroReview: Evolution of signalling in the sporulation phosphorelay (2002)
    Oxford,UK : Blackwell Science, Ltd
    Molecular microbiology 46 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Two-component and phosphorelay signal transduction systems are believed to function as environ-mental sensors that programme gene expression to the composition of the ecological niche in which a microbe normally resides. The question of how evolutionarily related bacteria that occupy different environments change their signal transduction pathways to adapt to such environments was asked of the sporulation phosphorelay of Bacillus subtilis, Bacillus halodurans, Bacillus anthracis and Bacillus stearothermophilus. Comparison of the primary amino acid sequence of phosphorelay proteins with the known structural and interactive properties of the B. subtilis proteins revealed that the amino acid residues of interaction surfaces between phosphorelay proteins and between a phosphorelay protein and DNA resist evolutionary change. The absolute conservation of interaction surfaces allowed the identification of sporulation sensor kinases in B. halodurans, B. anthracis and B. stearothermophilus. In these sensor kinases, the signal-sensing domains are vastly different in size and subdomain composition, with little apparent conservation between species, whereas the catalytic domains of these sensor kinases retain the high level of homology observed for the other phosphorelay proteins. Adaptation to new environments appears to result in rapid evolution of signalling domains to maximize environmental impact while maintaining identical protein–protein and protein–DNA contacts in the entire phosphorelay. In Clostridial genomes, only the Spo0A protein was found, suggesting that the anaerobic relatives of the Bacilli do not use a phosphorelay and phosphorylate Spo0A directly with sensor kinases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.03186.x
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  • 2
    Electronic Resource
    Electronic Resource
    Plasticity in the self-incompatibility system of Solanum carolinense (2004)
    Melbourne, Australia : Blackwell Publishing Ltd.
    Plant species biology 19 (2004), S. 0 
    Details
    ISSN: 1442-1984
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Solanum carolinense has a gametophytic self-incompatibility (GSI) system that is typical of the Solanaceae in which pistils produce specific S-RNase proteins that disrupt the growth of pollen tubes sharing the same S-allele. However, unlike most self-incompatible plants Solanum carolinense is a weed. Self-incompatibility is uncommon in weeds because disturbed habitats require frequent recolonization (hence populations are repeatedly founded by few individuals bearing a limited number of S-alleles), effective population sizes are small (supporting few S-alleles) and habitats are ephemeral (so there is limited time for the migration of additional S-alleles into populations). We carried out a series of greenhouse experiments using clonal replicates (rhizome cuttings) of plants from two natural populations of S. carolinense to determine if there is variation in the strength of GSI within these populations. We found that the growth rate of self-pollen tubes and self-fertility increases with floral age. That is, flowers become more self-compatible as they age. Moreover, we found that self-fertility increases on plants in which the first 20 flowers receive no cross pollen. That is, when few or no fruits are produced on the first 20 flowers, self-pollination is more likely to result in fruit/seed set. Finally, we found that genotypes differ in their degree of self-fertility indicating that there is broadsense heritability for plasticity in the strength of self-incompatibility. These findings indicate that some genotypes of S. carolinense are capable of producing self-seed when cross pollen is scarce, even though the plants have a functional GSI system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-1984.2004.00109.x
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  • 3
    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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  • 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
    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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  • 7
    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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  • 8
    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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  • 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
    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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