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  • 1
    Electronic Resource
    Electronic Resource
    Funding Considerations in Human Reproductive Ecology: Summary of an Evening Panel Discussion on Sources and Resources (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 709 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb30421.x
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  • 2
    Electronic Resource
    Electronic Resource
    Cell-water deficit regulates expression of rpoC1C2 (RNA polymerase) at the level of mRNA in desiccation-tolerant Nostoc commune UTEX 584 (Cyanobacteria) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 126 (1995), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Immobilization and short-term air-drying of the cyanobacterium Nostoc commune strain UTEX 584 leads to a complete depletion of its cellular rpoC1C2 mRNA pool. This mRNA is required for the synthesis of the γ and β′ subunits of DNA-dependent RNA polymerase (RNA-P). In contrast, RNA-P remains stable in cells during long-term desiccation as judged from immunoblotting analyses of protein extracts using RNA-P core-specific antibodies. The data indicate that the extant RNA-P holoenzyme in air-dried cells drives the rapid de novo transcription of rpoC1C2 that ensues in response to cell rehydration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1995.tb07410.x
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  • 3
    Electronic Resource
    Electronic Resource
    Control of matric water potential (ψm) in immobilised cultures of cyanobacteria (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 24 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Three simple methods are described that permit cells of cyanobacteria, immobilised on filter supports, to be subjected to matric water stress that leads to a downshift in nitrogenase activity. In Nostoc commune, a desiccation-tolerant form, nitrogenase activity is more sensitive to water stress than the intracellular ATP pool. When it is dried rapidly to −99.5 MPa, nitrogenase activity ceases within 30 min while the ATP pool is maintained at 16.07 pmol ATP ·μg protein−1. During short-term incubation, decreasing ψm from −0.10 to −23.1 MPa may result in an increased rate of CO2 uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01303.x
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution of plasmids in cyanobacteria of the LPP group (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 24 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The distribution of plasmid DNA has been studied in 23 strains and variants of non-heterocystous filamentous cyanobacteria that are susceptible to infection by the LPP-1 cyanophage (archetype). 21 have identical plasmid profiles and contain 3 plasmids of Mrs 0.9, 10 and approx. 12 · 106 respectively. In one strain, Plectonema FS180, the plasmids have been designated pMP1, pMP2, and pMP3, respectively. pMP1 shows sequence homology with pMP2 and pMP3 but not with DNA from an LPP-type cyanophage. Plectonema UTEX 598 lacks the small plasmid only, while Plectonema UTEX 1541 is distinct amongst all these strains with 3 plasmids of Mrs 3, 10, and 〉 30 · 106, respectively. The findings support the view that the majority of these strains may be independent isolates of a single species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01333.x
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  • 5
    Electronic Resource
    Electronic Resource
    The ultrastructure of immobilised desiccated cells of the cyanobacterium Nostoc commune UTEX 584 (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 43 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cells of the cyanobacterium Nostoc commune UTEX 584 were immobilised, subjected to acute matric water stress (ψm=−128 MPa) and then desiccated. Their ultrastructure was investigated by the use of an anhydrous fixation procedure. Although shrunken and bleached, the integrity of the vegatative cells at the ultrastructural level was apparently preserved. The ease with which certain cyanobacterial cells can recover from desiccation may be consequent upon the maintenance of cellular organisation at the ultrastructural level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02127.x
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  • 6
    Electronic Resource
    Electronic Resource
    Stability of nucleic acids in immobilized and desiccated Nostoc commune UTEX584 (Cyanobacteria) (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 41 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two microscale methods were developed to isolate and analyze the [2-14C]uracil-labeled nucleic acids of immobilized, dried cells of the desiccation-tolerant cyanobacterium Nostoc commune UTEX584. The incidence of single-strand breaks (‘nicks’) in DNA of light-desiccated, but not dark-desiccated cells, was demonstrated by the use of DNA modification enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02204.x
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  • 7
    Electronic Resource
    Electronic Resource
    The anhydrobiotic cyanobacterial cell (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 97 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The cyanobacterium Nostoc commune has been developed as the prokaryotic model for the anhydrobiotic cell and it provides the means to answer fundamental questions about desiccation tolerance. The anhydrobiotic cell is characterized by its singular lack of water — with contents as low as 0.02 g H2O g-1 dry weight. These levels are orders of magnitude lower than those found either in bacterial spores or in cells subjected to acute salt (osmotic) stress. Mechanisms that contribute to the desiccation tolerance of N. commune include the selective stabilization of anhydrous proteins, the secretion of water- and lipid-soluble UV-absorbing pigments, and the secretion of a complex glycan that immobilizes the cells, immobilizes water stress proteins and the UV-absorbing pigments, and which may confer the properties of a mechanical glass upon colonies. Rehydration of desiccated cells induces an instantaneous resumption of metabolic activities, including membrane transport and global lipid biosynthesis. These initial recoveries may not follow classical Arrhenius-based kinetics. The rehydrating cell exhibits a stringent, stepwise recovery of physiological capacities beginning with respiration, then photosynthesis and finally nitrogen fixation. Protein turnover, de novo protein synthesis and a rapid rise in the intracellular ATP pool accompany these recoveries. During the early stages of rehydration, the de novo transcription of one gene set (rpoC1C2) is achieved using an extant DNA-dependent RNA polymerase holoenzyme that remains stable in desiccated cells. These properties of desiccation-tolerant cyanobacleria, present in extant forms such as N. commune and Chroococcidiopsis spp., may have been utilized by the eoanhydrobiotes. However, it is the desiccation-tolerant cyanobacterium as a whole, and not some collection of disparate properties, that must be considered as the primary strategy for the achievement of desiccation tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00545.x
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  • 8
    Electronic Resource
    Electronic Resource
    The serine, threonine, and/or tyrosine-specific protein kinases and protein phosphatases of prokaryotic organisms: a family portrait (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 22 (1998), S. 0 
    Details
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Inspection of the genomes for the bacteria Bacillus subtilis 168, Borrelia burgdorferi B31, Escherichia coli K-12, Haemophilus influenzae KW20, Helicobacter pylori 26695, Mycoplasma genitalium G-37, and Synechocystis sp PCC 6803 and for the archaeons Archaeoglobus fulgidus VC-16 DSM4304, Methanobacterium thermoautotrophicum delta H, and Methanococcus jannaschii DSM2661 revealed that each contains at least one ORF whose predicted product displays sequence features characteristic of eukaryote-like protein-serine/threonine/tyrosine kinases and protein-serine/threonine/tyrosine phosphatases. Orthologs for all four major protein phosphatase families (PPP, PPM, conventional PTP, and low molecular weight PTP) were present in the bacteria surveyed, but not all strains contained all types. The three archaeons surveyed lacked recognizable homologs of the PPM family of eukaryotic protein-serine/threonine phosphatases; and only two prokaryotes were found to contain ORFs for potential protein phosphatases from all four major families. Intriguingly, our searches revealed a potential ancestral link between the catalytic subunits of microbial arsenate reductases and the protein-tyrosine phosphatases; they share similar ligands (arsenate versus phosphate) and features of their catalytic mechanism (formation of arseno- versus phospho-cysteinyl intermediates). It appears that all prokaryotic organisms, at one time, contained the genetic information necessary to construct protein phosphorylation–dephosphorylation networks that target serine, threonine, and/or tyrosine residues on proteins. However, the potential for functional redundancy among the four protein phosphatase families has led many prokaryotic organisms to discard one, two, or three of the four.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6976.1998.tb00369.x
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