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  • Articles  (185)
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  • 2000-2004  (75)
  • 1980-1984  (110)
  • Biology  (185)
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  • Articles  (185)
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  • 11
    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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  • 12
    Electronic Resource
    Electronic Resource
    Human transforming growth factors induce tyrosine phosphorylation of EGF receptors (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 259-262 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The demonstration of increased levels of phosphotyrosine-containing proteins in cells transformed by avian5"8 and mammalian9'13 RNA tumour viruses raises the question of whether regulatory pathways which involve tyrosine phosphorylation may also have significance in the aetiology of spontaneous and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292259a0
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  • 13
    Electronic Resource
    Electronic Resource
    The constancy of the solar diameter over the past 250 years (1980)
    [s.l.] : Nature Publishing Group
    Nature 288 (1980), S. 548-551 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Reconsideration of meridian circle observations with analysis of transits of Mercury and durations of total solar eclipses indicate that there has been no detectable secular change in the solar diameter during the past 250 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/288548a0
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  • 14
    Electronic Resource
    Electronic Resource
    Seasonal variation of oriental sunspot sightings (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 617-619 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows the number of sunspot sightings that have been recorded in each month of the year according to a catalogue of pre-telescopic sunspot sightings (139 in all)6 which is based on an independent search of official oriental dynastic histories. These sightings have been used to obtain the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287617a0
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  • 15
    Electronic Resource
    Electronic Resource
    Gyromagnetism and the remanence acquired by a rotating rock in an alternating field (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 48-49 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When a rock is rotated at an angular frequency w in a zero field, any magnetic moments within it will incline towards the rotation axis and a magnetic moment will appear antiparallel to the rotation vector. This is known as the Barnett effect and is a consequence of the intrinsic gyroscopic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284048a0
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  • 16
    Electronic Resource
    Electronic Resource
    A gyroremanent magnetisation in anisotropic magnetic material (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 49-51 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The phenomenon of gyromagnetism is well known (see ref. 1 for a review) but it has not generally been considered that it could ever produce an easily measurable remanent magnetisation. It has recently been suggested, however2,3, that the RRM identified by Wilson and Lomax in rock samples4, can be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284049a0
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  • 17
    Electronic Resource
    Electronic Resource
    Feline sarcoma virus polyprotein P115 binds a host phosphoprotein in transformed cells (1980)
    [s.l.] : Nature Publishing Group
    Nature 286 (1980), S. 409-412 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In view of accumulating evidence implicating the non-structural components of Gardner and Snyder-Theilen FeSV encoded polyproteins in transformation (see rf. 10 for review), we analysed uninfected and FeSV transformed mammalian cells for the presence of proteins which exhibit specific binding ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/286409a0
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  • 18
    Electronic Resource
    Electronic Resource
    Establishing the case for the Maunder Minimum (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 592-592 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-The News and Views contribution of 31 January (page 427) entitled "Was there a Maunder Minimum?" projects a superficial understanding of the meticulous work by solar astronomers, historians, climatologists, palaeobiologists, and scientists from a host of other research disciplines supporting a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284592c0
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  • 19
    Electronic Resource
    Electronic Resource
    Chromosomal localization of human cellular homologues of two viral oncogenes (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 747-749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two mammalian and four avian cell-derived viral oncogenes encoding proteins with tyrosine-specific protein kinase activity have been described1. One of these, c-fes, is represented within the genomes of two independent isolates of feline sarcoma virus (FeSV), Gardner and Snyder-Theilen, both of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299747a0
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  • 20
    Electronic Resource
    Electronic Resource
    Fit for what? (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 8-95 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In his article (Nature 4 June, p.373) on the new Origin of Species exhibition in the British Museum (Natural History), Dr Cox quotes the sound track of a film loop "The Survival of the Fittest is an empty phrase, it is a play on words". This appears to refer to the widespread belief that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292008d0
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