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  • 1
    Electronic Resource
    Electronic Resource
    Stereoisomeric lactoyl-.beta.-methylcholine iodides. Interaction with cholinesterase and acetylcholinesterase (1974)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 17 (1974), S. 1057-1060 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00256a006
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  • 2
    Electronic Resource
    Electronic Resource
    The peritrophic membrane and faecal pellets of Gammarus lacustris limnaeus Smith (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 8 (1978), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Gammarus lacustris limnaeus Smith was fed decomposed autumnshed leaves of maple (Acer saccharum Marsh.) and poplar (Populus tremuloides Michx.). Faecal pellets were collected at various time intervals after egestion and examined under a light and a scanning electron microscope. Nearly all the faecal pellets collected up to a period of about 7 h after egestion possessed a thin, tightly-fitting peritrophic membrane while those that had been outside the gut of the animal for a longer time lacked a peritrophic membrane. Presumably, after egestion faecal pellets swell because of absorption of water leading to eventual rupture and loss of the membrane. The surface of newly extruded pellets is devoid of microbes and microbes seem to play a very insignificant role in the loss of peritrophic membrane from the pellets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1978.tb01441.x
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  • 3
    Electronic Resource
    Electronic Resource
    A sample holder for decomposing and processing delicate biological materials for scanning electron microscopy (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. A simple, inexpensive sample holder was developed to permit delicate biological materials (faecal pellets) to be decomposed in aquatic environments and thereafter to be processed by dehydration and critical point drying procedures. Part of the holder itself is used to mount the sample onto specimen studs. Delicate materials are therefore never subjected to physical damage during handling at any stage of their processing for scanning electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01509.x
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  • 4
    Electronic Resource
    Electronic Resource
    Pollution from land runoff (1980)
    s.l. : American Chemical Society
    Environmental science & technology 14 (1980), S. 148-153 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60162a003
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  • 5
    Electronic Resource
    Electronic Resource
    Anaerobic Incubation of Soil and the Production of Ammonium (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 534-534 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Anaerobic topsoil values (?NH4 ? N) and aerobic topsoil values (? (NH44-NO34-NO2) ? N) were correlated with maize fertilizer experimental data obtained from a small number of trials (twenty sites) carried out in western Tanzania. The air dry topsoils (0-15 cm) used in the incubation tests were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214534a0
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  • 6
    Electronic Resource
    Electronic Resource
    Zinc Deficiency induced by Mercury in Coffea arabica (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 1607-1608 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first effects were observed on trees in field trials which had been treated with phenyl mercury acetate, and appeared 4 5 months after the last application of the fungicide. These effects took the form of a severe leaf scorch such as is often associated with the use of phytotoxic materials. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1821607a0
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  • 7
    Electronic Resource
    Electronic Resource
    Ascorbic Acid Content of Some Local Barbados Foods (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 531-532 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE West Indian diet normally contains a high proportion of starchy ‘roots’ and fruits such as yams, sweet potatoes, eddoes, breadfruit, banana, etc., but very few leafy green and yellow vegetables, and in some islands very little fruit. This means that, for many people, almost the only source ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/164531b0
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  • 8
    Electronic Resource
    Electronic Resource
    Microbial Decomposition of Various Fractions of Ureaformaldehyde (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 1202-1203 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In these investigations, release of ammonium-nitrogen was followed using the soil perfusion technique and the accumulation of nitrate-nitrogen (nitrification) was used as an index of mineralization. Fifty grams of Guelph loam (2 to 5 mm mesh, pH. 7-0-7-3) were perfused with 200 ml. of distilled ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2111202a0
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  • 9
    Electronic Resource
    Electronic Resource
    The preservation unaltered, of mineral nitrogen in tropical soils and soil extracts (1967)
    Springer
    Plant and soil 27 (1967), S. 53-80 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Experiments have been conducted on different methods of storing soils and soil extracts to preserve the mineral-N status unaltered. Neither the addition of chemicals at the rates used nor storage at sub-zero temperatures were found to preserve the mineral-N status of the soils completely unaltered over short periods of time. Furthermore, evidence was found to show that storage at sub-zero temperatures can effect subsequent mineralization of nitrogen during incubation. The mineral-N content of soil extracts prepared with an acidified K2SO4 reagent was not preserved over short periods by the addition of chemicals, by storing the extracts at sub-zero temperatures or by the addition of copper ions to the extracting solution. The mineral-N content of soil extracts prepared with a neutral KCl reagent could be preserved during storage at subzero temperatures but the addition of copper ions to the extracting reagent was not effective. Changes in the mineral-N content of both soils and soil extracts during storage were not consistent and in the soils appeared to be related to biological activity and the concentration of mineral N present. In soil extracts changes appeared to be related to the concentration of mineral-N present and to some other factor(s).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373978
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  • 10
    Electronic Resource
    Electronic Resource
    A comparison of autoclaved and gamma-irradiated soils as media for microbial colonization experiments (1967)
    Springer
    Plant and soil 27 (1967), S. 239-248 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects on various properties of Lincoln Clay of a sterilizing dose of gamma radiation (3.0 megarads) were compared to the effects resulting from autoclaving the soil (121°C) for 1 hour. Effects of both treatments were much more drastic when moist, rather than air-dry soil was treated but, in general, radiation had less effect on soluble organic matter and on total water-extractable electrolyte than did autoclaving. Radiation caused a greater release of NH4-N from soil treated moist than did autoclaving but the reverse was true in dry soil. Alcohol-soluble ninhydrin-positive material was increased by both sterilization procedures with irradiation having the greater effect. The aggregate stability of Lincoln clay was decreased by irradiation and increased by autoclaving. Pure cultures of bothArthrobacter sp. andPseudomonas sp. grew better, on the basis of cell yields, in irradiated than in autoclaved soil. Respiration of mixed soil organisms in an artificial soil amended with an extract of irradiated soil was almost identical with that in an extract of air-dried soil but auto-claved soil extract was only metabolized after a prolonged lag period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373392
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