Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Evidence of an Extraterrestrial Origin for Some Organic Constituents of Meteorites (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 1290-1290 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Samples of Orgueil, Murray, Mokoia and Haripura meteorites were extracted separately for 6 h in a Soxhlot apparatus with a 9: 1 benzene-methanol mixture. The solvent was evaporated from the extract and the isotopic composition determined of the hydrogen, carbon and sulphur of residues from each ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1971290a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Complex Organic Micro-Structures in the Mokoia Meteorite (1962)
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 1126-1127 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Mokoia meteorite is a carbonaceous ehon-drite1. It is a heterogeneous structure, fragments containing 0-5-2-1 per cent by weight of carbon. This carbon is present as a mixture of water-soluble and organic solvent-soluble organic compounds2. There are three possible hypotheses for the origin of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1931126a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Visual Pigment of Grapsoid Crabs (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 784-786 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WIThIN the past few years a number of research VV workers have isolated visual pigments from a variety of arthropods. Kampa1 has extracted a pigment from the eyes of a euphausiid crustacean, Euphausia pacifica, while Fisher and Goldie2 have prepared a similar photosensitive substance from the eyes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190784a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Retinene-1 in Insect Tissues (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 874-875 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] However, extracts of the pupae of the silkworms Bombyx mori and Antherea pernyi have been reported8'9 to contain vitamin A, while Goldsmith10 recently has demonstrated that extracts of the heads of honey-bees contain retinene-l, and that a visual pigment of this insect is a rhodopsin compound ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/192874a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Organic Constituents of Meteorites (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1137-1140 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PROF. J. D. BERNAL has recently commented1 on the significance of carbonaceous meteorites in theories on the origins of terrestrial life. He points out that the reported2 organic constituents of these meteorites may have played a part in the formation of life on Earth, or may be derived from some ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911137a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Some Microstructures of Complex Morphology Observed in Preparations of Carbonaceous Chondrites made under Sterile Conditions (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 1245-1248 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] VARIOUS classes of microstructures in the 5-30(jL size-range have recently been examined in samples of carbonaceous meteorites by Claus and Nagy1-3, who have named the objects "organized elements". On the basis of detailed morphological studies and staining reactions with biological dyes, Claus and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1971245a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Properties of the Organic Microstructures of Some Carbonaceous Chondrites (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1076-1077 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEVERAL authors have recently suggested that carbonaceous chondrites contain materials of biological, yet extra-terrestrial origin. Conclusive proof of this hypothesis would be of tremendous scientific importance; however, this should not lead to too hasty an acceptance on insufficient experimental ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1951076a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Changes in plasma vitamin A in lactating and non-lactating oral contraceptive users (1983)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 90 (1983), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Plasma vitamin A and retinol-binding protein (RBP) concentrations have been studied in women using oral contraceptives (OC) for up to 4 years. In eight women taking an oestrogenic OC(1 mg of nor-ethisterone acetate +50 μg of ethinyloestradiol) values almost doubled within 6 months, but diminished somewhat after 4 years. Saturation of RBP with retinol remained fairly constant. Five lactating women who took pro-gestogen-only OC (30 μg of levonorgestrel or 350 μg of norethisterone) showed no significant alteration in plasma vitamin A or RBP concentrations as compared with nine lactating non-OC users. All lactating women showed significant differences between the highest and lowest plasma vitamin A (P〈0.005) and RBP (P〈0.05) concentrations during the first 6 months of lactation. Highest values occurred 11–12 weeks post-partum and the lowest at 15–17 weeks. Percentage saturation of RBP with retinol was significantly higher (P〈0.005) when vitamin A concentration was highest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1983.tb06750.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Organic constituents of the carbonaceous chondrites (1963)
    Springer
    Space science reviews 1 (1963), S. 647-682 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a brief discussion of forms of meteorite carbon it is concluded that almost all the carbon in the carbonaceous chondrites is present as organic matter. Attempts to extract and identify this organic matter are then reviewed. It is shown that only 25 per cent has been extracted and only about 5 per cent chemically characterized. Of this 5 per cent most is a complex mixture of hydroxylated aromatic acids together with various hydrocarbons of the paraffin, naphthene and aromatic series. Small amounts of amino acids, sugars and fatty acids also are present. The possible chemical nature of the major fraction is discussed. It is suggested to be a mixture of high-molecular weight aromatic and hydrocarbon polymers. Possible sources of contamination of the meteorites are described and evidence indicating a general lack of organic contaminants is presented. It is concluded that most of the organic constituents are indigenous to the meteorites and are extra terrestial in origin. Synthetic processes for the compounds are mentioned and it is concluded that the organic material is probably of abiogenic origin. A brief review on studies of “organized elements” contained within the meteorites is presented. Difficulties of identification are discussed and photographs of some micro-structures of several carbonaceous chondrites are presented. No final conclusion about the nature of these objects is possible, but some appear to be various indigenous organic and mineral structures, while others are terrestrial contaminants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212447
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...