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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The cpeBA operon of the Group III chromatically adapting cyanobacterium Pseudanabaena species PCC 7409 was cloned, sequenced and characterized. The cpeBA genes are transcribed in green-light-grown cells as an abundant 1400-nucleotide mRNA which initiates 69 nucleotides upstream from the cpeB translation start. Extensive sequence identity, extending 70 nucleotides 5′ to the transcription start, occurs among cpeBA promoters of Group II and III chromatic adapters. Cell extracts of green-light-grown Calothrix species PCC 7601 contain an activity which specifically binds a restriction fragment containing the Pseudanabanea species PCC 7409 cpeBA promoter. Green-light-dependent cpeBA transcription in Group II and III chromatically adapting cyanobacteria is suggested to be similarly controlled by a transcriptional activator.
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  • 2
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The psaE gene, encoding a 7.5 kDa peripheral protein of the photosystem I complex, has been cloned and characterized from the cyanobacterium Synechococcus sp. PCC 7002. The gene is transcribed as an abundant monocistronic transcript of approximately 325 nt. The PsaE protein has been overproduced in Escherichia coli, purified to homogeneity, and used to raise polyclonal antibodies. Mutant strains, in which the psaE gene was insertionally inactivated by interposon mutagenesis, were constructed and characterized. Although the PS I complexes of these strains were similar to those of the wild type, the strains grew more slowly under conditions which favour cyclic electron transport and could not grow at all under photoheterotrophic conditions. The results suggest that PsaE plays a role in cyclic electron transport in cyanobacteria.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 5 (1991), S. 0 
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The new Bintulu water supply was built in the early 1980s to serve a major development of the town of Bintulu in Sarawak, East Malaysia, arising from the extraction of natural gas from the South China Sea. The water supply was designed to supply 78 Ml/d. The works comprise earth dams forming a pumped storage reservoir, a river intake, pumping stations, pipelines, a water-treatment works, treated water storage and a distribution system. The treatment works and distribution system are being built in two phases. The first phase was completed in 1983, and the second phase is to be constructed in 1990–91.The paper describes the initial planning of the scheme, including water-demand forecasts, the design and construction of the Phase I works, and problems encountered during its operation. It also highlights the exceptionally rapid implementation programme and stability problems at the main earth dam.
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 286 (1980), S. 469-471 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A Petrel rocket, designated P216 in the UK National Programme, was flown from Kiruna, Sweden, to compare electron intensities seen in pulsating aurora with related parameters at the magnetically-conjugate geostationary satellite GEOS 2. The rocket was launched at 21.07.33 UT on 25 January 1979 ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 148-149 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Spectrograms of positive ions and electrons taken from near the middle of theflight are shown in Fig. 1. In this period the rocket, travelling northwards,left the diffuse aurora to the south of the arc to enter at 265 s the intensestream of electrons that produced the luminous east-west curtain of ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 34 (1992), S. 153-162 
    ISSN: 1432-1432
    Keywords: Phylogenetic inference ; Stationarity ; Substitutional Bias ; Compositional bias ; Cyanelle ; Cyanophora paradoxa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Available molecular and biochemical data offer conflicting evidence for the origin of the cyanelle of Cyanophora paradoxa. We show that the similarity of cyanelle and green chloroplast sequences is probably a result of these two lineages independently developing the same pattern of directional nucleotide change (substitutional bias). This finding suggests caution should be exercised in the interpretation of nucleotide sequence analyses that appear to favor the view of a common endosymbiont for the cyanelle and chlorophyll-b-containing chloroplasts. The data and approaches needed to resolve the issue of cyanelle origins are discussed. Our findings also have general implications for phylogenetic inference under conditions where the base compositions (compositional bias) of the sequences analyzed differ.
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 582-583 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The standard treatment of Fermi's idea as a second-order process considers all particles to diffuse gradually in energy according to j2 (1) where Edet is the energy attained after N scatterings, E0 the initial energy and (3 " 1 is the mean velocity of scattering centres normalized to the speed of ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 236-237 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Last year it was reported by N. M. S. et al.1 that when the Soviet spacecraft Phobos approached Mars on 12 February 1989 and entered the magnetosheath of heated solar wind behind the bow shock upstream from the planet, the energy dis-tribution of electrons was generally characterized by two ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 23-24 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BRYANT ET AL. REPLY- In our initially purely mathematical re-evaluation of the capabilities of Fermi acceleration2, the key parameters were all derived, using essentially only the observed spectral slope; none was freely adopted, as appears to have been assumed by Chi et al. Preliminary results of ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 402-403 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We assume that the incident stream of charged particles has a Maxwellian energy spectrum. Such spectra are commonly observed in the plasma sheet5?the probable source of most auroral particles?and the energy distributions of auroral particles often resemble accelerated Maxwellian distributions. We ...
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