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  • 2000-2004  (2)
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  • 2003  (2)
  • 1987  (1)
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  • 2000-2004  (2)
  • 1985-1989  (1)
  • 1965-1969
  • 1920-1924
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  • 1
    Electronic Resource
    Electronic Resource
    Excitation energy flow at 77 K in the photosynthetic apparatus of overwintering evergreens (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The flow of excitation energy from the antennae to photosynthetic reaction centre complexes at 77 K was studied in leaves of two evergreen species, namely, snow gum (Eucalyptus pauciflora Sieb. ex Spreng.) and a hemiparasitic mistletoe (Amyema miquelii, Lehm. ex Miq.). The leaves that were naturally acclimated to winter conditions of freezing temperatures and high irradiance displayed the recently discovered cold-hard-band or CHB feature of the chlorophyll a fluorescence spectra (Gilmore & Ball, Proc. Nat. Acad. Sci. USA 97:11098–11101, 2000). A streak-camera-spectrograph was used and the double convolution integral method for global analysis was applied to simultaneously acquire and simulate, respectively, the time- and wavelength-dependence of all major chlorophyll a components (Gilmore et al. Phil. Trans. Roy. Soc. B-London 355:1371–1384, 2000). The CHB coincided with changed amplitudes and decreased excited state lifetimes for the main F685 nm and F695 nm emission bands from the photosystem II (PSII) core-inner-antenna. The CHB dissipates energy as heat separate from PSII while also reducing the PSII quantum yield by competing for both photon absorption and antenna excitation. The CHB did not correlate with changes in the decay kinetics of the PSI antenna F740 nm band. The spectral-kinetic features of the altered energy flow were similar in the unrelated evergreen species. These results are consistent with a functional association between the CHB, PSII energy dissipation and protective storage of chlorophyll in overwintering evergreens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.01026.x
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  • 2
    Electronic Resource
    Electronic Resource
    The DNA sequence and analysis of human chromosome 6 (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 805-811 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Chromosome 6 is a metacentric chromosome that constitutes about 6% of the human genome. The finished sequence comprises 166,880,988 base pairs, representing the largest chromosome sequenced so far. The entire sequence has been subjected to high-quality manual annotation, resulting in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02055
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  • 3
    Electronic Resource
    Electronic Resource
    Plant gene expression in effective and ineffective root nodules of alfalfa (Medicago sativa) (1987)
    Springer
    Plant molecular biology 9 (1987), S. 469-478 
    Details
    ISSN: 1573-5028
    Keywords: in vitro translation ; leghemoglobin ; nodulin gene expression ; Northern analysis ; Rhizobium-alfalfa symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Expression of plant genes involved in the symbiosis between alfalfa (Medicago sativa) and Rhizobium meliloti has been studied by comparing root and root nodule mRNA populations. Two-dimensional gel electrophoretic separation of the in vitro translation products of polyA+ RNA isolated from either roots or effective root nodules has allowed us to identify thirteen nodule-specific translation products, including those corresponding to the leghemoglobins (Lb). These translation products, representing putative nodulin mRNAs, are first detected between 9 and 12 days after inoculation, a result which has been confirmed for Lb mRNA by Northern blotting and hybridization with a Lb cDNA probe. Analysis of three different types of ineffective root nodules arrested in different stages of development has led to the following conclusions. (i) The transcription of eleven nodule-specific genes, including the Lb genes, is independent of nitrogen-fixing activity. (ii) Differentiation of the primary nodule structure does not require the transcription of any of these genes but can be correlated with a dramatic reduction in the level of at least five transcripts present in the root. (iii) There is enhanced expression of certain plant genes in the case of nodules elicited by an Agrobacterium strain carrying the symbiotic plasmid of R. meliloti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015878
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    Paper (German National Licenses)
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