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  • 1
    Series available for loan
    Series available for loan
    Qasimia gen. nov., and early Marattialike fern from the permian of Saudi Arabia (1985)
    Leiden
    Associated volumes
    Details Availability
    Call number: SR 93.0422(79)
    In: Scripta geologica
    Type of Medium: Series available for loan
    Pages: 50 S.
    Series Statement: Scripta geologica 79
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopic Identification of Alpha-Emitting Nuclides in Biological Material (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 667-669 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN connexion with a programme aimed at the identification and measurement of the radioactivity of the human body and its environment1"4, an attempt has recently been made to undertake spectral analysis of the alpha-activity of normal biological materials. The most satisfactory general method of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/184667a0
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  • 3
    Electronic Resource
    Electronic Resource
    Lead-210 in Some Human and Animal Tissues (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 353-354 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Six samples of bone, obtained from subjects who had died of malignant disease, were analysed for both total lead and lead-210. The specimens were dry ashed at 470-500 C., using lead-free concentrated nitric acid as an ashing aid. After solution of the ash in lead-free hydrochloric acid, lead, was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190353b0
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  • 4
    Electronic Resource
    Electronic Resource
    Palaeozoic plants from Saudi Arabia (1980)
    [s.l.] : Nature Publishing Group
    Nature 285 (1980), S. 33-34 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] More than 1,000 specimens were collected from an exposure alongside the Unayzah to Buraydah road, in the town of Unayzah (Fig. 1). The plants are preserved as impressions in a 5-20-cm limonitic shale band within a sequence of beds of alternating sand and shale, close to the base of the Khuff ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/285033a0
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  • 5
    Electronic Resource
    Electronic Resource
    Pigmentation development in hatchery-reared flatfishes (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Malpigmentation is common in hatchery-reared flatfishes, decreasing the market value of whole fish, and increasing the risk of predation for juveniles released to enhance wild stocks. Pigmentation development in flatfishes occurs in two phases. First, during embryonic and larval stages pigment cells differentiate on both sides of the body. Second, at metamorphosis larval melanophores disappear, and adult melanophores differentiate on the ocular but not on the blind side. Malpigmentation seems to result from disruptions of the second phase, and may take the form of albinism on the ocular side or darkening of the blind side. Both types of aberration may be related to aspects of the hatchery environment such as lighting, substratum, and diet. Larval nutrition appears to be a key factor and enrichment of larval diets with fatty acids and Vitamin A can greatly reduce malpigmentation rates; however, levels suffcient to prevent pigmentation defects frequently cause other abnormalities. Two developmental explanations for albinism have been proposed. The first is that differentiation of ocular-side skin follows the normal blind-side pathway and adult melanophores therefore fail to develop on the ocular side. The second hypothesis suggests that dietary deficiencies inhibit retinal development and the resulting visual defects lead to failure of a hormonal signal required for melanophore differentiation. These hypotheses may well be complementary; as yet neither has been thoroughly tested. Definitive tests will require a combination of manipulative techniques such as tissue transplantation and cell culture with nutritional, behavioural and hormonal assays. Such integrative studies will further the understanding both of normal pigmentation development and of the environmental factors that contribute to high rates of albinism in hatchery-reared flatfish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02121.x
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  • 6
    Electronic Resource
    Electronic Resource
    Lead-210 and Polonium-210 in Grass (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 211-212 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN recent publications from this Department1.2 it has been shown that the a-activity observed in certain samples of grass is largely due to the presence of polonium-210 (radium F)9 accompanied by its parent lead-210 (radium D). In the present communication evidence is presented that suggests that a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/187211a0
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  • 7
    Electronic Resource
    Electronic Resource
    Radiation from Ball Lightning (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1007-1007 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIB,-In a recent communication (Nature, 228, 545; 1970) Altschuler and his colleagues suggest that the phenomenon of ball lightning may be due to formation of the short-lived radioactive nuclides 15O and 17F within a localized plasma capable of yielding radioactive decay energy of the order of 107 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281007b0
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  • 8
    Electronic Resource
    Electronic Resource
    Acoustic Bragg diffraction from human tissues (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 305-306 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our early observations suggested qualitatively that the acoustic Bragg traces obtained were indeed characwteristic of the particular tissues examined3 and modelling calculations have shown that the data are consistent with the hypothesis4 that diffraction arises predominantly from the connective ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257305a0
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  • 9
    Electronic Resource
    Electronic Resource
    Vote of no confidence (1990)
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 419-419 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-The crisis at London's Natural His-tory Museum, which erupted when the corporate plan was announced on 23 April this year, has now lasted more than four months and shows no sign of ending. The essence of this crisis is that the plan will result, whatever its stated intentions, in narrowing the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/347419a0
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  • 10
    Electronic Resource
    Electronic Resource
    Polonium-210 in Man (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 423-428 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is well known that the atmosphere contains appreciable quantities of radon as a result of emanation from the materials of the Earth's crust. Until recently, however, little interest has been taken in the fate of the long-lived radionuclides produced in the atmosphere by radon decay. Radium D ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208423a0
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