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  • 1
    Electronic Resource
    Electronic Resource
    A spectroscopic technique for measuring slow rotational diffusion of macromolecules. 1: Preparation and properties of a triplet probe (1976)
    s.l. : American Chemical Society
    Biochemistry 15 (1976), S. 3653-3656 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00662a001
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  • 2
    Electronic Resource
    Electronic Resource
    A spectroscopic technique for measuring slow rotational diffusion of macromolecules. 2: Determination of rotational correlation times of proteins in solution (1976)
    s.l. : American Chemical Society
    Biochemistry 15 (1976), S. 3657-3661 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00662a002
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of Water Vapor (1948)
    s.l. : American Chemical Society
    Analytical chemistry 20 (1948), S. 958-962 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60022a030
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  • 4
    Electronic Resource
    Electronic Resource
    Alarms and Analyzers for Nerve Gas Vapors (1958)
    s.l. : American Chemical Society
    Analytical chemistry 30 (1958), S. 1239-1247 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60139a016
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  • 5
    Electronic Resource
    Electronic Resource
    210Po and 210Pb in zooplankton fecal pellets (1978)
    Springer
    Marine biology 44 (1978), S. 325-328 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 210Po and 210Pb concentrations in fecal pellets from the zooplanktonic euphausiid Meganyctiphanes norvegica are reported. The 210Po:210Pb activity ratio is 2.2±0.3, a value in good agreement with that found in suspended particulate matter in surface seawater. Estimates of 210Po and 210Pb removal times from the mixed layer by fecal pellets alone yield values which are of the same order of magnitude as the removal times for these nuclides by all routes. It is suggested that there is a high probability that zooplanktonic fecal pellets play a significant role in the removal of both these nuclides from the surface layers of the ocean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390896
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  • 6
    Electronic Resource
    Electronic Resource
    Polonium-210 in euphausiids: A detailed study (1976)
    Springer
    Marine biology 34 (1976), S. 127-136 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A detailed study of 210Po, the predominant alpha-emitting nuclide found in most marine organisms, has been undertaken in a particular zooplanktonic species, the euphausiid Meganyctiphanes norvegica. The purpose was to obtain information concerning the origin, the localization and the flux of the nuclide in and through this organism. Measurements of 210Po were made in euphausiids of different sizes, in dissected organs and tissues, and in excretion products. The results show higher concentrations in the smaller specimens; this fact cannot be explained on the basis of surface adsorption, but is probably related to the ingestion of food. Dissection results show that the distribution of 210Po in euphausiids is not homogeneous, but that the majority is concentrated in the internal organs, the alimentary tract and the hepatopancreas in particular. The natural radiation dose received by these organs is in consequence much higher than that received by the whole animal. Use of a dynamic model allowed the flux of 210Po through M. norvegica to be calculated. The calculations confirm that food is the principal source of 210Po for this species, and clearly show that fecal pellets constitute the major elimination route. Extrapolation of the data to zooplankton in general leads to the conclusion that zooplankton metabolic activity plays an important role in transporting 210Po from the surface layers of the ocean to depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390754
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  • 7
    Electronic Resource
    Electronic Resource
    Polonium-210 and lead-210 in marine food chains (1979)
    Springer
    Marine biology 52 (1979), S. 227-236 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 210Po and 210Pb have been measured systematically in whole animals, muscle and hepatopancreas of crustaceans and of molluscan cephalopods representative of a pelagic and benthic food chain. The same nuclides were also measured in liver, pyloric caecum, stomach contents and muscle of tuna. The concentration factors from sea water to whole animals were approximately constant along both food chains, being of the order of 104 for 210Po and 102 for 210Pb. The highest concentration factors were found in shrimp of the genus Sergestes. In muscle, the concentration factors were an order of magnitude less; in the hepatopancreas, they were an order of magnitude higher, reaching 106 in shrimp of the genus Sergestes. Such concentrations imply alpha-radiation doses of the order of 10 rem per year and more in this organ, which contains about 50 to 90% of the 210Po in the whole animal in the 11 species analyzed. A detailed study of the intracellular behaviour of 210Po in the hepatopancreas is clearly indicated. 210Po can be used as a sensitive natural tracer in biological systems. Thus, feeding Meganyctiphanes norvegica in the laboratory on food low in 210Po led to an approximate value of about 61/2 days for the biological half-life of 210Po in the hepatopancreas of this euphausiid. Furthermore, the data on 210Po and 210Pb in the cephalopod hepatopancreas allowed the time of conservation of frozen squid which had been bought at the market to be estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398136
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  • 8
    Electronic Resource
    Electronic Resource
    210Pb as a dietary indicator in the Antarctic pelagic community (1993)
    Springer
    Marine biology 115 (1993), S. 161-171 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The naturally occurring radionuclide 210Po is useful as a tracer of diets of marine organisms. Data for 210Pb, the grandparent of 210Po, are less abundant: we therefore report here 210Pb concentrations in a substantial collection of marine biota obtained from the Antarctic Ocean during the SIBEX II cruise in 1985. The general levels of 210Pb are within the range of previously published data but, as in the case of 210Po, there are differences which can be associated with variations in the diet of the organism. The levels of 210Pb in the krill Euphausia superba show seasonal changes which can be interpreted in terms of changing diet. In a simple classification of the pelagic food chain, the levels of 210Pb tend to increase from omnivores to filter-feeders to predators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349398
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  • 9
    Electronic Resource
    Electronic Resource
    Polonium-210 content of marine shrimp: Variation with biological and environmental factors (1981)
    Springer
    Marine biology 65 (1981), S. 165-175 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The concentrations of 210Po and 210Pb were determined in more than 30 species of marine shrimp. Samples were collected in the years 1977 to 1980; most were from the Mediterrancean Sea near Monaco, the remainder from Kuwait, South Africa, USA and Great Britain. The median 210Po concentration was 8.0 pCi g-1 dry wt in the whole shrimp and 85 pCi g-1 dry in the hepatopancreas; the corresponding 210Po:210Pb activity ratios were 77 and 138, respectively. The range of concentrations covered more than two orders of magnitude for both nuclides. The variations in the levels of 210Po, in particular, could be related to biological and environmental factors; thus, penaeid shrimp had 210Po at median concentrations some three to four times higher than carid shrimp, and there was a steady increase in the median 210Po concentration as one moved from estuarine to coastal to pelagic to deep-pelagic species. 210Po levels were highest in 3 species of deep-pelagic penaeids, where a median 210Po concentration in the whole shrimp of 43 pCi g-1 dry wt was found. The natural radiation dose received by the hepatopancreas of such individuals will be of the order of 100 rem per yr. Elevated 210Po was also found in 4 species collected near Kuwait. The 210Po data are interpreted as indicating changes in the food regime of different shrimp; specifically it is suggested that 210Po-rich items such as hepatopancreas, faecal pellets and organic particulates are likely to be important in the diet of shrimp which feed at depth in the ocean. It is suggested further that the ultimate availability of 210Po to the foodchain depends on its form in sea water, and the need for information concerning the degree of organic binding of 210Po in natural waters in stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397082
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  • 10
    Electronic Resource
    Electronic Resource
    Natural tracers in dietary studies: data for 210Po and 210Pb in decapod shrimp and other pelagic organisms in the Northeast Atlantic Ocean (1988)
    Springer
    Marine biology 97 (1988), S. 507-519 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements of the concentrations of the naturally-occurring radioactive nuclides 210Po and 210Pb in a large number of pelagic organisms from the Atlantic Ocean made in the spring/summer of 1984 and 1985 are reported. Marine shrimp are particularly well represented, and in many cases data were obtained for shrimp hepatopancreas, stomach-contents, and posterior intestine plus contents, as well as for whole individuals. The wide ranges found in 210Po concentrations group into categories: the shrimp, for example, divide into four categories, two penaeid and two carid. These groupings are explained on the basis of variations in diet between the different categories. A clear difference was also observed between the 210Po levels in shrimp of similar species and size from opposite sides of an oceanographic front; this difference too can be explained plausibly in terms of a change in certain penaeid shrimp, and attention is drawn to the need for investigation of cytological and/or genetic effects which could possibly be caused by the very high natural radiation doses to which such organisms are exposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391047
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