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  • Blackwell Publishing Ltd  (12)
  • Oxford University Press  (12)
  • Springer Nature  (10)
  • American Institute of Physics  (2)
  • 1990-1994  (36)
  • 1
    Electronic Resource
    Electronic Resource
    OCCURRENCE AND BEHAVIOR OF THE SOUTHERN RIGHT WHALE DOLPHIN LISSODELPHIS PERONII OFF NAMIBIA (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 7 (1991), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The southern right whale dolphin Lissodelphis peronii is a seldom seen cetacean of southern latitudes. Off southern Africa, observations have been made predominantly in the major upwelling area off Lüderitz, Namibia, but the species has now also been seen south of the Orange River in South African waters. Sightings for the years 1980–1990 are documented and they reveal that L. peronii occurs off southern Africa both inshore and offshore and throughout the year. An opportunity for extended observation in January 1989 afforded the opportunity to record some interesting behavior patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1991.tb00547.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mapping of genes on the linear chromosome of the bacterium Borrelia burgdorferi: Possible locations for its origin of replication (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 99 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Molecular clones of Borrelia burgdorferi, aetiologic agent of Lyme borreliosis, were isolated and analysed by DNA sequence determination. This procedure yielded B. burgdorferi homologues of gidA, gyrB, gyrA, ftsA and ftsZ. The genes were located on the physical map of the B. burgdorferi linear chromosome. Also mapped were the genes fla and p60 while dnaA was mapped using a heterologous probe. gyrA and gyrB were found to be in tandem and were mapped, along with dnaA at the centre of the chromosome. gidA was located close to the left hand extremity of the chromosome. Because gyrB, dnaA and gidA are normally located within 50 kb of the origin of replication (oriC), we propose two possible sites for oriC in the B. burgdorferi linear chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05575.x
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  • 3
    Electronic Resource
    Electronic Resource
    Metabolism of dimethylsulfoniopropionate and glycine betaine by a marine bacterium (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 96 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The metabolism of the methylated osmolytes glycine betaine (GB) and dimethylsulfoniopropionate (DMSP) was studied in a bacterium (strain MD 14–50) isolated from a colony of the cyanobacterium Trichodesmium. MD 14–50 when grown on DMSP cleaved dimethylsulfide (DMS) from DMSP and oxidized acrylate. In contrast to DMSP, GB was metabolized by sequential N-demethylations. Low concentrations (100 μM) of DMSP or GB allowed the growth of MD 14–50 on glucose at higher salinities than in their absence. At elevated salinities, DMSP was accumulated intracellularly with less catabolism and DMS production. Thus, DMSP and GB were catabolized by different mechanisms but functioned interchangeably as osmolytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05394.x
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  • 4
    Electronic Resource
    Electronic Resource
    Demethylation and cleavage of dimethylsulfoniopropionate in marine intertidal sediments (1994)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 14 (1994), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Demethylation and cleavage of dimethylsulfoniopropionate (DMSP) was measured in three different types of intertidal marine sediments: a cyanobacterial mat, a diatom-covered tidal flat and a carbonate sediment. Consumption rates of added DMSP were highest in cyanobacterial mat slurries (59 μmol DMSP 1−1) and lower in slurries from a diatom mat and a carbonate tidal sediment (24 and 9 μmol DMSP 1−1 h−1, respectively). Dimethyl sulfide (DMS) and 3-mercaptopropionate (MPA) were produced simultaneously during DMSP consumption, indicating that cleavage and demethylation occurred at the same time. Viable counts of DMSP-utilizing bacteria revealed a population of 2 × 107 cells cm−3 sediment (90% of these cleaved DMSP to DMS, 10% demethylated DMSP to MPA) in the cyanobacterial mat, 7 × 105 cells cm−3 in the diatom mat (23% cleavers, 77% demethylators), and 9 × 104 cells cm−3 (20% cleavers and 80% demethylators) in the carbonate sediment. In slurries of the diatom mat, the rate of MPA production from added 3-methiolpropionate (MMPA) was 50% of the rate of MPA formation from DMSP. The presence of a large population of demethylating bacteria and the production of MPA from DMSP suggest that the demethylation pathway, in addition to cleavage, contributes significantly to DMSP consumption in coastal sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1994.tb00104.x
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  • 5
    Electronic Resource
    Electronic Resource
    Physiological diversity amongst some moderately thermophilic iron-oxidising bacteria (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 8 (1991), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1991.tb01778.x
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  • 6
    Electronic Resource
    Electronic Resource
    Temperate bacteriophages and lysogeny in lactic acid bacteria (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 87 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Lysogeny is widespread in the lactic acid bacteria. The majority of lysogens can be induced by UV irradiation or treatment with mitomycin C, but indicator strains which allow lytic growth of the induced phage are often not easy to identify. A few temperate phages have been shown to transduce chromosomal and/or plasmid markers. Information about the molecular biology of the temperate phages from lactic acid bacteria is sparse and needs significant supplementation in order that these potentially valuable phages might be utilized more efficiently as tools for improving existing starter strains in dairy fermentations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04880.x
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  • 7
    Electronic Resource
    Electronic Resource
    Physiological diversity amongst some moderately thermophilic iron-oxidising bacteria (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 85 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Three strains of moderately thermophilic and acidophilic bacteria capable of oxidising ferrous iron, isolated from different sources, were compared with each other and with an earlier isolate, TH1. The isolates displayed different rates of carbon dioxide fixation and incorporation of glucose and glycine; only one could be subcultured continuously in organic-free ferrous sulfate medium. Two of the isolates readily oxidised elemental sulfur, and all were capable of solubilising pyrite and chalcopyrite, though at different rates; there was no correlation between rates of ferrous iron and pyrite oxidation. Reduction of ferric iron by two of the isolates was observed in unshaken cultures containing 10 mM glucose. The DNA base composition of the isolates varied from 43–68 mol% G + C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04759.x
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  • 8
    Electronic Resource
    Electronic Resource
    Biosynthesis of trichothecene mycotoxins: cell-free epoxidation of a trichodiene derivative (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 81 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: A cell-free enzyme system from cultures of Fusarium culmorum catalyses the 12,13-epoxidation of semi-synthetic 9β, 10β-epoxytrichodiene to 9β, 10β;12,13-diepoxytrichodiene. This enzyme activity may be involved in the biosynthesis of trichothecene mycotoxins and since the 12,13-epoxide is known to be essential for toxicity, the enzyme activity probably confers the toxic properties associated with this group of mycotoxins. The epoxidase requires NADPH and molecular oxygen, is inhibited by carbon monoxide, and thus appears to be a cytochrome P-450-dependent mono-oxygenase. Whole cell cultures of the fungus carry out the same biotransformation, and in addition hydroxylate the diepoxide product at position 3, yielding 3α-hydroxy-9β,10β;12,13-diepoxytrichodiene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04765.x
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  • 9
    Electronic Resource
    Electronic Resource
    Functional and phenotypic changes associated with the in vitro development of human monocytes into activated macrophages (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 64 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Freshly isolated human peripheral blood monocytes had minimal cytotoxic effect in vitro on the schistosomula of Schistosoma mansoni. However, stimulation of the cells with either interferon gamma (IFN) or specific anti-parasite antiserum caused an increase in cytotoxicity. Additionally, the normal development of monocytes into macrophages over 7 days was associated with a sharp increase in cytoxocity. The non-cytotoxic monocytes were compared with activated macrophages to assess whether cytotoxicity was associated with changes in immunophenotype. As monocytes developed into macrophages there were marked increases in transferrin receptors (HB21), macrophage cellular integrin (3.9), and Fc receptors (KB61). A further three markers showed increased expression in 7-day-old macrophages stimulated by IFN, namely a high affinity Fx γ receptor (10.1), MHC Class II (1B5) and tumour necrosis factor (TNF).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03537.x
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous conjugal transfer in Lactococcus to genes involved in bacteriocin production and reduced susceptibility to bacteriophages (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 72 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Conjugal matings were performed between Lactococcus lactis DRC1 (a lactose-fermenting (Lac+), bacteriocin-producing (Bac+) strain) and L. lactis HID113 (Lac− Bac−). Transconjugant derivatives of HID113 were identified on the basis of lactose fermentation, resistance to the DRC1 bacteriocin (dricin) or reduced sensitivity to phage sk1. Regardless of how they were identified, all transconjugants gave fewer and smaller plaques with phages c2 and sk1 than did HID113. All but one of 275 transconjugants tested also produced dricin, suggesting some functional relationship or close genetic linkage between the reduced phage sensitivity and dricin production and resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03890.x
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