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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 22 (1983), S. 3924-3928 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of chemical & engineering data 26 (1981), S. 4-7 
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 527-532 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
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    Unknown
    Cambridge, Mass., etc., : Periodicals Archive Online (PAO)
    Greek, Roman and Byzantine Studies. 25:2 (1984) 177 
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  • 6
    facet.materialart.
    Unknown
    Cambridge, Mass., etc., : Periodicals Archive Online (PAO)
    Greek, Roman and Byzantine Studies. 21:4 (1980:Winter) 373 
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 57 (1980), S. 201-219 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using atomic absorption spectroscopy, exceptionally high concentrations of iron (778 to 82,363 μg g+1 dry weight) and zinc (219 to 4,183 μg g+1 dry weight) were detected in the livers of Dugong dugon (Müller) from north Queensland compared with reported values for other marine mammals from other areas of the world. Levels of copper (9.1 to 608 μg g+1 dry weight), cadmium (〈0.1 to 59 μg g+1 dry weight), cobalt (0.5 to 72 μg g+1 dry weight) and silver (0.2 to 39 μg g+1 dry weight) in the liver, and cadmium (0.2 to 209 μg g+1 dry weight) in the kidney were also relatively high in several samples, whilst concentrations of nickel, lead and chromium were consistently below the limits of detection in all tissues. Manganese concentrations, in all tissues examined, were generally comparable with those reported from other marine mammals. Tissue concentrations of a number of metals varied with the age of the dugong. Levels of iron, zinc, cadmium and cobalt in the liver zinc and cadmium in the kidney, and iron in the muscle were significantly positively correlated with age. Copper and manganese in both liver and kidney were negatively correlated with age. Large deposits of the iron-rich pigment, haemosiderin, the quantity of which also tended to increase with age, was a conspicuous feature of the livers of all the post-natal dugongs examined histologically. It seems unlikely that the unusual metal status of the dugong reflects anthropogenic activities, since many individuals were collected in remote areas far from major sites of urbanization and industrialization. Seagrasses, the major food of dugongs, were collected from various north Queensland dugong habitat-areas and analysed. Very high concentrations of iron but low levels of copper were detected. The significance of such dietary imbalances and their possible influence on the metal status of the dugong were therefore considered.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Saccostrea echinata (Quoy and Gaimard) were exposed to 10 μg 1-1 of either mercury, cadmium or lead at 30 °C, 36‰S; 30 °C, 20‰S; 20°C, 36‰S and 20°C, 20‰S for 30 d and were then transferred to clean seawater for a further 30 d to depurate. Specimens were removed at regular intervals during the exposure and depuration periods, dissected into gills, mantle, visceral mass and adductor, and analysed for the appropriate metal by atomic absorption spectroscopy. Mercury was concentrated more than the other metals in all tissues under all conditions. Cadmium uptake was greater than lead in all tissue in the high-temperature experiments, whereas both metals were concentrated to similar extents at low temperature. The gill tissue generally accumulated the greatest amount of all 3 metals, whilst the adductor concentrated the least amount. At both salinities, mercury and cadmium accumulation by all tissues was significantly greater at the higher temperature whereas lead uptake was only marginally increased. The accumulation rates of mercury at high temperature were significantly greater in all tissues at low compared with high salinity, whereas at low temperature, differences were not significant. Accumulation rates of cadmium and lead in the majority of tissues examined were significantly greater in lowsalinity water at both temperatures. In general, lead was lost the most rapidly from oyster tissues, followed by mercury and then cadmium. The residence times for mercury and cadmium differed significantly between tissues, with the gills showing the highest turnover rate. In contrast, residence times for lead were similar between tissues. Losses of all 3 metals from oyster tissues were not obviously influenced by temperature and only mercury losses differed significantly between salinities.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 19 (1982), S. 87-103 
    ISSN: 1432-1432
    Keywords: chorion ; molecular evolution ; multigene families ; mutation ; DNA sequence ; substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We report and compare the DNA sequences of 14 silkmoth (Antheraea polyphemus) chorion genes, derived from either cDNA or chromosomal DNA clones. Seven of these genes are members of the A multigene family, and seven are members of the B family. Where available, the previously reported (Jones and Kafatos 1980) intronic and extragenic flanking DNA sequences are also considered. Closely related sequences are compared, revealing the types of spontaneous mutations that were fixed during paralogous evolution. Segmental mutations (i.e. mutations other than substitutions) are nearly always interpretable as small duplications or deletions. related to small direct repeats. Segmental mutations are strongly constrained in the coding regions, although they do occur. Nucleotide substitutions also appear to be under selective constraints: relatively few substitutions leading to amino acid replacements are accepted, silent substitutions leading to some codons (especially purine-terminated ones) are disfavored, and different compositional biases are maintained in different parts of the sequences. Other sequence differences can be interpreted as indicative of neutral drift, including most differences in non-coding regions and most T/C transitions in third-base positions. In the non-coding regions, which are thought to be only loosely constrained by selection, transitions are observed more frequently than might be expected: they account for 52% of all substitutions, and they appear to be favored two to threefold over transversions when allowance is made for the skewed base composition of these regions.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 131 (1982), S. 43-50 
    ISSN: 1432-072X
    Keywords: Respiration ; Molar growth yields ; Thermophile ; Energy conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Whole cells of the extreme thermophile Thermus thermophilus HB8 contained a membrane-bound respiratory chain (comprised of nicotinamide nucleotide transhydrogenase, NADH dehydrogenase, menaquinone, and cytochromes b, c, aa3, o), which exhibited a maximum→H+/O quotient of approximately 8 g-ion H+·g-atom O-1 for the oxidation of endogenous substrates. Whole cell respiration at 70° at the expense of endogenous substrates or ascorbate-TMPD generated a transmembrane protonmotive force (Δp) of up to 197 mV and an intracellular phosphorylation poteintial (ΔGp), measured under similar conditions, of approximately 43.9 kJ·mol-1. The measured ΔGp/Δp ratio thus indicated an→H+/ATP quotient of approximately 2.3 g-ion H+·mole ATP-1. Glucose-limited continuous cultures of T. thermophilus at 60°, 70° and 78.5° exhibited extremely low moler growth yields (Y O2 max ≤27.6 g cells·mol O 2 -1 ; Y glucose max ≤64.4 g cells ·mol glucose-1) compared with mesophilic bacteria of similar respiratory chain composition and proton translocation efficiency. These low yields are probably at least partly explained by the extremely high permeability of the cytoplasmic membrane to H+, which thus causes the cells to respire rapidly in order to maintain the protonmotive force at a level commensurate with cell growth.
    Type of Medium: Electronic Resource
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