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  • 1
    Electronic Resource
    Electronic Resource
    A compact lighting system for use with portable leaf chambers to measure photosynthesis (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. A compact, portable lighting system, developed for the measurement of photosynthesis in the field with portable chambers and applicable to the laboratory, is described. The system consists of a miniature 50-W, 12-V tungsten-halogen lamp and a light guide which is constructed with randomized fibre bundles and mounted above the window of a portable assimilation chamber. The light guide distributes light uniformly across the leaf surface; the photon irradiance at the leaf surface is monitored by measuring the irradiant emitted from one fibre-optic bundle using a sensor connected to the body of the light guide. Up to 1600 μmol quanta photosynthetic active radiation m−2s−1 may be achieved at the leaf surface; irradiance may be varied by wire mesh screens of different densities. Leaf temperature follows air temperature outside the chamber to within ±2 °C over the range 10–30 °C and within the range of photon irradiances from 0 to 1600/μmol quanta m −2s. The power supply for the lamp is a 12-V, 24-A h lead-acid battery and the photon irradiance at the leaf surface gradually decreases by c. 3% over 2.5 h of measurement. With this system, response of photosynthetic rate to irradiance and to CO2 partial pressure at constant irradiance may be measured in the field, independent of natural variations in solar irradiance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01963.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Alginate on the Absorption of Lead in Man (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 1115-1116 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The expected stability constants of other metal algin-ates indicate that such dietary supplements may suppress the absorption of certain heavy metals, many of which are regarded as toxic. In particular, the ionotropic series quoted by Haug4 shows that lead is much more strongly bound to alginate ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2241115b0
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  • 3
    Electronic Resource
    Electronic Resource
    Excretion and Retention of Stable Strontium in Children (1971)
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 396-397 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 An oral dose of 5 mg of Sr enriched in 8.4.Sr was given at 11.00 h to two boys aged 10.2 and 12.3 yr who were medical in-patients of the St Mary's Teaching Group of Hospitals. Urine and faeces were collected daily for 14 days and samples of venous blood were taken at 2, 4 and 24 h and 6 and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/230396a0
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  • 4
    Electronic Resource
    Electronic Resource
    Turnover of Radioactive Strontium in New-born Rats (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 1240-1240 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pregnant female rats were divided into two groups and radioactive calcium and strontium (45Ca and 85Sr) added to the drinking water immediately after mating. One group was maintained on a diet containing 0.5 g per cent phosphorus and the other on an exactly similar diet except that the phosphorus ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2011240a0
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  • 5
    Electronic Resource
    Electronic Resource
    Reduction of the Absorption and Retention of Strontium in Rats (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 182-182 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sixty-three female albino rats, 8-9 weeks old and weighing about 130 g, were used. All rats had been fed the standard diet (1.0 g calcium, 0.5 g phosphorus/100 g diet) with water ad lib. since weaning. They were divided into seven groups of nine animals each and fed for 8 days on the standard diet ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215182a0
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  • 6
    Electronic Resource
    Electronic Resource
    Binding of Strontium in Blood (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 913-913 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Subject T. E. F. C. G. E. H. J. F. L. G. R. H. F. S. W. A. J. P.* Date mean value 12/2/62 19/2/62 26/2/62 1/3/62 12/2/62 19/2/62 26/2/62 1/3/62 3/5/62 30/5/62 Specific activity of strontium R atio Urine Plasma urine/ plasma 2-1 3-2 3-9 4-3 4-9 1-6 1-7 3-4 2-9 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/195913a0
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  • 7
    Electronic Resource
    Electronic Resource
    Intensity Distribution in the Fine Structure of the Balmer Lines (1927)
    [s.l.] : Nature Publishing Group
    Nature 119 (1927), S. 393-393 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the course of an investigation of the fine structure of the Balmer lines, at present being undertaken in this Laboratory, certain preliminary results of an apparently novel character have been obtained which seem to be of considerable interest. These refer to the dependence of the relative ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/119393b0
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  • 8
    Electronic Resource
    Electronic Resource
    Relative Availability of Strontium in Cereals and Milk (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 200-201 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Three male adults (aged 38-56) took a diet of constant composition for 28-32 days. The diet (about 3,000 calories) is shown in Table 1. The wholemeal broad was made from grain which contained about 10 times as much strontium-90 as current British flour. It was in fact grown on soil which has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194200a0
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  • 9
    Electronic Resource
    Electronic Resource
    Strontium-90 in Human Plasma (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 324-324 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Blood Products Laboratory, Lister Institute, provided us with 70 bottles containing about 120 litres of pooled plasma unfit for transfusion because of bacterial contamination. This had been prepared from whole blood collected between Novem ber 1958 and March 1959, except for about 2 litres ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189324a0
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  • 10
    Electronic Resource
    Electronic Resource
    Estimation of Strontium in Biological Materials by means of a Flame Spectrophotometer (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 792-793 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Need has arisen in this laboratory for a rapid and reliable means of estimating strontium in biological material as a result of the continued study of the turn-over of strontium in man and experimental animals. A method, based on neutron activation analysis, has already been described3. Although ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182792b0
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