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  • 1
    Electronic Resource
    Electronic Resource
    Sampling biological characteristics of krill: Effect of heterogeneous nature of swarms (1990)
    Springer
    Marine biology 107 (1990), S. 409-415 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An effect of the very patchy distribution of Antarctic krill (Euphausia superba Dana) in various forms of aggregation is that a single swarm may not provide an unbiased estimate of population parameters such as mean length of krill in the local area. Here, we analyse the number of samples required to estimate the characteristics of a local population as precisely as if there were no differences between krill swarms in terms of their biological composition. Krill were intensively sampled over different spatial and temporal scales around South Georgia in 1981 and 1982, and in the Bransfield Strait in 1985. These varied from replicate hauls at a single station over 24 h and repeat sampling in restricted areas over periods of 6 to 14 d to regional surveys around South Georgia and in the Bransfield Strait. Various biological characteristics were measured such as length, maturity, moult stage and feeding state. Depending upon the biological characteristic examined and the area covered by the sampling programme, the number of samples needed to obtain the same degree of precision as would be found in the absence of heterogeneity varied from 3 to 〉 80 samples. This has important implications for the design of net-sampling programme for monitoring krill populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313422
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  • 2
    Electronic Resource
    Electronic Resource
    Moult in relation to some aspects of reproduction and growth in swarms of Antarctic krill,Euphausia superba (1996)
    Springer
    Marine biology 127 (1996), S. 201-208 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a 14-d period 38 swarms of Antarctic krill,Euphausia superba Dana, were sampled in an area 55.5 x 55.5 km to the southwest of Elephant Island, at the north of the South Shetland Islands. Moult stage, maturity stage, and size of ca. 100 krill from each swarm were measured. Each of the characteristics varied greatly between swarms. Moulting krill were found in most swarms, but in one swarm all of the krill were just about to moult. Ways in which moulting may act as a possible sorting mechanism are discussed. Data for all the analysed krill (ca. 3000 specimens) were used to investigate the interdependence of moult rate, sexual maturation and growth. While all immature krill moulted at approximately the saine rate in the study, there were significant differences in the moulting rates of mature male and female krill. Gravid female krill continued to moult, although less frequently than mature males. As a consequence males had to attach spermatophores to females after each moult. It is likely that variation in moult rate of females and males was related to the energy expenditure required for ovary development in females and spermatophore production and searching behaviour in males. Spawning and moulting were only partly coupled in gravid females. Spawning appeared to take place predominantly during Moult Stage D2. There was no evidence of intermoult growth by intersegmental dilation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00942104
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of Dextran and Fibrinogen (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 970-970 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When 2-ml. volumes of two saline solutions containing 6 per cent dextran and 1 -45 per cent fibrinogen were mixed at 22 C, the formation of a bulky floccu-lent precipitate was observed. Analysis showed that the precipitate contained 13 per cent of the available fibrinogen. Precipitation occurred ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169970a0
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular Composition of Dextran Solutions for Intravenous Use (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 770-771 
    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 a recent investigation1, it was observed that the dextran recovered from the urine of patients transfused with dextran had a lower intrinsic viscosity, and hence a lower average molecular weight, than that of the dextran which had been given intravenously. One case received a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165770a0
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Dextran of Various Molecular Sizes on Erythrocyte Sedimentation Rate (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 988-989 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The method involved mixing known concentrations of dextran in 0.9 per cent sodium chloride with fresh defibrinated human blood from normal volunteers. The final concentration of red blood corpuscles in the mixtures was maintained at definite values, in these experiments corresponding to a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166988a0
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  • 6
    Electronic Resource
    Electronic Resource
    Phosphate Esters produced by Mammalian Skin from 2-Deoxy- D -glucose (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 1028-1029 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Three phosphate esters commonly formed from D-glucose-6-phosphate in living cells are D-fructose-6-phosphate, r〉-glucose-1 -phosphate and D-gluconate-6-phosphate. 2-Deoxy-D-glucose-6-phosphate cannot, for obvious structural reasons, be converted to a product corresponding to D-fructose-6-phosphate, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1871028a0
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  • 7
    Electronic Resource
    Electronic Resource
    Stability of Dextran during Prolonged Storage (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 174-174 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The renal excretion of these dextrans was measured in rabbits (Table 2). The greater part of the dextran was excreted on the first day, less than 3 per cent on the second and less than 1 per cent on the third day. Two, three or four rabbits were used for each determination and the daily results ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/192174a0
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  • 8
    Electronic Resource
    Electronic Resource
    Isotopically Labelled Macromolecules in Biological Research : Dextran Labelled with Radioactive Iodine (1966)
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 1113-1115 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MACROMOLECULES labelled with radioactive isotopes have several potential uses. Two applications of interest in biological research are firstly for measuring in vivo the permeability of membranes to solute molecules of various sizes and secondly to serve as standards in the comparison of samples of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2101113a0
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  • 9
    Electronic Resource
    Electronic Resource
    Labelling of Inulin with Radioactive Iodine (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 675-676 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This was done as follows : inulin (5 gm.) in 50 ml. water was stirred under a reflux condenser, and allyl bromide (0-5gm.) in 3-5 ml. methyl ethyl ketone was slowly added to produce a fine emulsion. The temperature was raised to 65-70° C. and 10-4 ml. N sodium hydroxide solution was added gradually ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/188675a0
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of Dextran during Prolonged Storage (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 88-88 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The renal excretion of these dextrans in rabbits is shown iri Table 2. Two rabbits were used for each determination (1965) and the daily results averaged; Table 2 shows totals for 3 days after injection. After 5 years storage there appeared to have been an increase in the renal excretion of dexti ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213088a0
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