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  • 1975-1979  (5)
  • 1
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    Derek H. Aldcroft, "British Transport since" 1914: "An Economic History" (Book Review) (1976)
    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 2:3 (1976:July) 262 
    Details
    ISSN: 0305-7488
    Topics: Geography
    Description / Table of Contents: The British Isles and the European mainland
    Notes: Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h349-1976-002-03-000006
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  • 2
    Electronic Resource
    Electronic Resource
    Absence of “void area” in freeze-etched vesicles of the Alnus crispa var. mollis Fern. root nodule endophyte (1976)
    Springer
    Archives of microbiology 107 (1976), S. 263-267 
    Details
    ISSN: 1432-072X
    Keywords: Nitrogen fixation ; Root nodule ; Endophyte vesicle ; Alder ; Alnus ; Freeze-etching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrogen-fixing root nodules of Alnus crispa var. mollis Fern. were studied by transmission electron microscopy and by freeze-etching technique. Ultrathin sectioning of septate vesicles of the actinomycetal endophyte showed an electron transparent zone, the so-called “void area”, between the vesicle cell wall and its encapsulation material. This void area was not observed in the freeze-etching replicas of cryoprotected nodular tissue. It is suggested that the void area is the result of the coming-off of the vesicle cell wall from the capsule and that its formation reflects difficulty in fixing the voluminous mature vesicle of the root nodule endophyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425337
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of oxygen, mannitol and ammonium concentrations on nitrogenase [C2H2] activity in a marine skeletal carbonate sand (1975)
    Springer
    Marine biology 32 (1975), S. 49-62 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Following a lag of 3 to 18 h, acetylene reduction in mannitol-amended sand systems proceeded at approximately constant and high rates for periods up to 4 days. Carbon dioxide production and O2 consumption were low in these systems in comparison to similar systems additionally amended with ammonium, indicating N-limitation of growth in the former. Thus, long-term acetylene assays of mannitol-amended sand and suspensions from the sand incubated at various partial pressures of oxygen could be used to characterize the O2-sensitivity of the N2-fixing bacterial population as a whole, in batch-type systems with a minimal degree of enrichment or change in pO2 during the course of the assays. Results of various studies suggested that aerobic or microaerophilic N2-fixing bacteria were absent or scarce in the sand, and that nitrogenase activity occurring in aerobically incubated systems occurred in anaerobic microenvironments. Hydrogen stimulated acetylene-reducing activity, but the time course differed from that of mannitol-supported activity, and proceeded with shorter lags in systems incubated at 0.2 and 0.05 atm O2 than in systems incubated anaerobically. Efficiency of N2 fixation [C2H2] increased with decreasing initial mannitol concentration. For sand washed with seawater to remove native combined inorganic nitrogen, and amended with 0.015% mannitol, 374 μmoles added NH4-N/kg wet sand caused almost complete repression of nitrogenase activity, while concentrations as low as 12 μmoles added NH4-N/kg wet sand appeared to cause at least partial repression of nitrogenase activity. Some implications of these results for the existence of anaerobic microenvironments in the cavities of skeletal carbonates, and for N2-fixation in the seagrass rhizosphere are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395159
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  • 4
    Electronic Resource
    Electronic Resource
    On Schistosoma margrebowiei Le Roux, 1933: The morphology of the egg, miracidium and cercaria, the compatibility with species of Bulinus, and development in Mesocricetus auratus (1977)
    Springer
    Parasitology research 54 (1977), S. 233-250 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of the egg, miracidium, and cercaria of Schistosoma margrebowiei are described. The compatibility of S. margrebowiei with species of Bulinus has been examined. The parasite develops well in the diploid, tetraploid and octoploid snails of the truncatus/tropicus complex with overall infection rates of 38.1%, 30.1% and 29.1% respectively, and in reticulatus group snails (Bulinus wrighti) with an infection rate of 45.8% of those snails surviving the prepatent period. Only two species of the forskali complex (Bulinus bavayi, Aldabra; Bulinus beccarii, South Arabia) are slightly compatible, and snails of the africanus group are incompatible. The overall worm return from 24 hamsters exposed individually to 100 cercariae was 39.8%; 82.1% of the worms were paired, the remainder unpaired. The growth of the paired worms was recorded from 28–60 days. The prepatent period in hamsters is 33 days, in sheep 38 days. The mean egg production was 837 eggs/day in infections ranging from 33 to 60 days. Most eggs (80.9%) were deposited in the intestine, and only 18.2% were deposited in the liver. The parasite is pathogenic in hamsters, and peak death rate occurred in the 50–60 day group infections which coincided with the period of peak egg production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390115
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  • 5
    Electronic Resource
    Electronic Resource
    Observations on some isoenzymes of strains ofSchistosoma bovis; S. mattheei, S. margrebowiei, andS. leiperi (1978)
    Springer
    Parasitology research 57 (1978), S. 49-56 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary There are two main and two weak fractions of malate dehydrogenase isoenzyme common toSchistosoma bovis, S. leiperi, S. margrebowiei andS. mattheei: a major fraction at pI 8.56, seconded at pI 7.38, with weaker activity at pI 7.05 and pI 8.15. Variation in malate dehydrogenase occurs in some species/strainsen passage. In the strains ofS. bovis there are eight common bands of lactate dehydrogenase isoenzymes, at pI 6.85, 7.05, 7.16, 7.35, 7.50, 7.95, 8.03 and 8.38 with peak activity at pI 8.38 forS. bovis [Kisat, Kajulu (B. africanus) (B. forskali), Urudi-Kenya: Sardinia; Spain].S. mattheei has a peak band at pI 8.38, and also additional bands at pI 7.16, 7.50, 7.95, 8.52, 8.65 and 8.72.S. leiperi has peak activity at pI 7.74, and about 25% of the total activity is found between pI 8.38 and pI 9.50.S. margrebowiei shows peak activity at pI 8.38, seconded by a band at pI 8.86. The strains ofS. bovis show peak activity of acid phosphatase at pI 6.45;S. mattheei andS. leiperi at pI 7.52 andS. margrebowiei at pI 7.37. Despite intraspecific variation, the secondary bands place strains ofS. bovis from Western Kenya into one group and the strains from the Mediterranean area into another group, with the exception ofS. bovis Urudi, Kenya which, like the Mediterranean forms, possesses alkaline fractions above pI 7.50.S. bovis Iran does not possess fractions alkaline to pI 6.65 and therefore shows similarity to four strains from Western Kenya.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927628
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