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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 39 (1977), S. 289-295 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrences of K, Rb, Cs, Ca, Sr, Ba and Pb have been determined in various tissues of the tuna fish Thunnus alalunga. K, Rb, and Cs are distributed uniformly throughout the organs of the fish; 95% of the ca and Sr, and 70% of the Ba and Pb are contained in the skeleton. It is found that there are smaller amouts of Cs, Ba and Pb associated with the nutrient metals K and Ca in a marine animal compared to a terrestrial animal. This difference is a result of the purity of K and Ca in sea-water and the smaller amounts of trace metals associated with them compared to the impurity of K and Ca in terrestrial rocks. Food-chain enhancement and depletion of metals can be evaluated by comparing rations of trace metals to abundant nutrient metals in seawater and tuna. Cs is enriched relative to K in going from seawater to tuna by a factor of 13. Sr and Ba are both depleted by factors of 5 relative to Ca in going from seawater to tuna, while Pb is enriched relative to Ca by a factor of 14. Special clean laboratory procedures were used to prepare samples for accurate analysis by stable isotope dilution mass spectrometric techniques.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 90 (1986), S. 501-503 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Concentrations of thallium in phytoplankton (0.02 to 0.8 μg g−1), zooplankton (0.03 to 0.5 μg g−1) and ichthyoplankton (0.1 μg g−1) from the central Pacific were comparable $$\left( {\bar x = 0.2\mu g{\text{ }}g^{ - 1} } \right)$$ , as were the atomic ratios of thallium to calcium (∼3x10−6) and to potassium (∼1x10−6) in those organisms. These relatively constant ratios, plus the biounlimited ocean profile of thallium, indicate that it is rapidly cycled through plankton in the same manner as potassium, its principal biogeochemical analogue. The higher atomic ratios of thallium to potassium in pelagic clays (6x10−6) and ferromanganese nodules (4x10−3) suggest that both biological transport processes and abiotic transport processes influence this trace element's oceanic cycle.
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  • 13
    ISSN: 1432-1890
    Keywords: Key words Arbuscular mycorrhizal fungi ; Internal transcribed spacer ; Ribosomal DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The 5.8 S subunit and flanking internal transcribed spacer (ITS) regions in nuclear ribosomal DNA (rDNA) from spores of Glomus mosseae FL156 and UK118 were amplified by polymerase chain reaction (PCR) using ITS1 and ITS4 as primers. The amplification product from template DNA of UK118 was cloned and sequenced (569 bp); the amplified DNA from FL156 was sequenced directly (582 bp). There was a 95% sequence similarity between DNAs amplified from the two isolates; in contrast, major dissimilarities with partial sequences of seven other glomalean taxa were observed. Four oligonucleotide sequences unique to Glomus mosseae were identified as potential primers. Their specificity to Glomus mosseae was assessed by PCR amplification of genomic DNA from spores from 36 glomalean fungi: 13 isolates of Glomus mosseae, two Glomus monosporum, 10 other Glomus isolates, and 11 other glomalean taxa from each of four other genera. The Glomus mosseae isolates were from a broad range of temperate zone agricultural soils. Oligonucleotide pair GMOS1 : GMOS2 primed specific amplification of an oligonucleotide sequence (approximately 400 bp) present in all Glomus mosseae isolates and two isolates of the closely related Glomus monosporum. This primer pair did not prime PCR when the template consisted of DNA from any of the other glomalean fungi or any of the nonmycorrhizal controls. In addition, a 24-mer oligonucleotide, designated GMOS5, hybridized with Glomus mosseae and Glomus monosporum DNA amplified by PCR using primer pairs ITS1 : ITS4 and GMOS1 : GMOS2. Colony-blot assays showed that GMOS5 hybridized to 100% and 97% of E. coli pUC19 clones of amplification products from Glomus mosseae FL156 and UK118 DNA templates, respectively, indicating that nearly all clones contained an homologous sequence. GMOS5 was used successfully to detect specifically Glomus mosseae in DNA extracted from colonized sudan grass (Sorghum sudanense L.) roots and amplified by PCR using the primer pair GMOS1 : GMOS2. The results confirm several previous indications that Glomus mosseae and Glomus monosporum are indistinguishable taxonomic entities.
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  • 14
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 47-55 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The absolute values of the reflecting powers ρ are measured for the 200 and 2 ± τ, 0, 0 set of magnetic and nuclear reflections in the helimagnetic phase of a good-quality crystal of MnP as a function of its thickness. Severe and very different extinction effects are observed for the magnetic and nuclear reflections (ymagnetic ̃0.4, ynuclear ̃0.02 for the largest thickness). This corresponds to the spectacular result that the magnetic reflecting powers ρ± are twice as big as the nuclear one ρN, in spite of the fact that the scattering cross sections |F±|2 are about ten times smaller than the nuclear |FN|2. The nuclear results appear consistent with dynamical theory while the magnetic ones are not. They can be explained by Zachariasen's type II secondary extinction model based on the chirality domain pattern. The same measurements were performed in the ferromagnetic phase, yielding yferro ∼ 0.03. A model using the relative sizes of the ferromagnetic and chirality domains is presented.
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 51 (1986), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Ground lean pork was stored for up to 16 days at 4°C after cooking to an internal temperature of 75°C. The samples, stored for 0, 2, 4, 8, and 16 days, were evaluated for warmed-over (off) aroma by nine experienced panelists using a descriptive analysis line scale. The warmed-over aroma mean scores from 0 to 8 days of storage correlated well with the TBA (thiobarbituric acid) means. Although not significant (p〉0.05), overall sensory scores appeared to decrease on day 16 while TBA values remained high. Further investigation of a significant judge by time interaction (p = 0.04) led to the clustering of judges by their responses into two homogeneous groups. Although both groups indicated a significant storage effect, group 1 perceived a levelling off in off aroma after day 8 whereas group 2 perceived a significant decrease (p〈0.05) from day 8 to 16. Progressive masking of warmed-over aroma by a rancid aroma and a large variation in the panelists' sensitivity to rancid aroma may explain the discrepancy.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 350-352 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] KNOWLEDGE of lead in the oceans is important not only to investigations of lead isotope evolution in the Earths crust, but also to those of oceanic and atmospheric mixing. The concentrations of common lead in sea-waters off southern California have been previously examined1, and were found to ...
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  • 17
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 180-181 (1992), S. 165-166 
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Inorganic Biochemistry 36 (1989), S. 345 
    ISSN: 0162-0134
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 24 (1993), S. 153-188 
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
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