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  • 1
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    3.2 Froms of Nitrogen in Beacon Sandstone Rocks Containing Endolithic Microbial Communities in Southern Victoria Land, Antarctica (1988)
    Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
    In:  EPIC3Polarforschung, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research, 58(2/3), pp. 211-218, ISSN: 0032-2490
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Polarforschung" , peerRev
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The origin and nature of organic nitrogen in soil as assessed by acidic and alkaline hydrolysis (2001)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 52 (2001), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The origin and nature of much of the organic nitrogen in soil is unknown or speculative. Alkaline hydrolysis was used to fractionate soils into alkali-soluble and insoluble fractions. Alkali-insoluble residues from a wide variety of soils contained largely fixed ammonium or chitin or both. Acid hydrolysis of alkali-insoluble residues from soils, microbes, insects and well-rotted plant litter confirmed the presence of hexosamine-N.The hexosamine-N derived from estimates of soil biomass accounted for less than 10% of the chemically determined hexosamine-N values. It is suggested that most of the hexosamines are held in complexes formed between chitin complexed with other materials, e.g. pigments, that occur predominantly in the cell walls of microbes and insects. These complexes show resistance to enzymes during the life of soil organisms that persists after their death.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.2001.00419.x
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  • 3
    Electronic Resource
    Electronic Resource
    Observations on the Entrapment of Organic Matter within the Particle Structure of Calcareous Sediments (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 627-628 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The organic compounds associated with natural sediments and their concentration have been well documented in recent literature1"4. Most of these analyses have dealt either with compounds in interstitial waters or in the hydrolysates of whole sediments. During the present work it became apparent ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207627a0
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  • 4
    Electronic Resource
    Electronic Resource
    Hybrid plasmids containing the araBAD genes of Escherichia coli B/r
    Amsterdam : Elsevier
    Gene 3 (1978), S. 177-189 
    Details
    ISSN: 0378-1119
    Keywords: BamI, EcoRI, PstI restriction endonucleases ; Cloning in pBR317 ; ColE1 ; genetic complementation and recombination
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(78)90031-8
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  • 5
    Electronic Resource
    Electronic Resource
    Conversion of closed circular DNA molecules to single-nicked molecules by digestion with DNAase I in the presence of ethidium bromide
    Amsterdam : Elsevier
    BBA Section Nucleic Acids And Protein Synthesis 407 (1975), S. 365-375 
    Details
    ISSN: 0005-2787
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2787(75)90104-5
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  • 6
    Electronic Resource
    Electronic Resource
    Precipitation nitrogen at maritime Signy Island and continental Cape Bird, Antarctica (1992)
    Springer
    Polar biology 11 (1992), S. 649-653 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mineral nitrogen (NH4-N + NO3-N) in precipitation occurring at continental and maritime Antarctic sites has been determined. Precipitation at sites remote from animal activity contained much less mineral N than that occurring at sites influenced by such activity. Estimates for nitrogen input at two contrasting fellfield sites, one at continental Cape Bird (dry site), the other at maritime Signy Island (wet site) are presented. At both sites precipitation N represented the major N input to fellfield biota than did wind blown particulate matter containing organic nitrogen or ammonia volatilized from adjacent guano soils and becoming absorbed by moist artificial soils traps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237961
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  • 7
    Electronic Resource
    Electronic Resource
    The nature of the organic nitrogen of soils (1972)
    Springer
    Plant and soil 36 (1972), S. 191-198 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Examination of the 6N HC1 hydrolysates from 14 different proteins indicated that a considerable proportion of the total protein nitrogen in the hydrolysates, as determined by the micro-Kjeldahl method, was not accounted for by the NH4-N and the α amino nitrogen found in the hydrolysates. It seems clear that this hydrolysable unidentified nitrogen (HUN) originates mainly from non-amino nitrogen atoms present in arginine, tryptophan, lysine and proline. These nitrogen atoms do not satisfy the conditions necessary for reaction with ninhydrin. The amounts of each amino acid in a particular protein determine the HUN value which will be obtained for 6N HC1 hydrolysates of that protein. There is good agreement between the HUN values for a wide range of proteins when calculated from the amino acid composition of the protein and when determined experimentally. It is concluded that these findings indicate a considerably higher content of amino acid nitrogen in the organic nitrogen of soils and leaf litter than was previously considered to be the case. It is suggested that the findings support the contention that the organic nitrogen of soils contains leaf protein complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373469
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  • 8
    Electronic Resource
    Electronic Resource
    The nature of the organic nitrogen of soils (1972)
    Springer
    Plant and soil 36 (1972), S. 191-198 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Examination of the 6N HC1 hydrolysates from 14 different proteins indicated that a considerable proportion of the total protein nitrogen in the hydrolysates, as determined by the micro-Kjeldahl method, was not accounted for by the NH4-N and the α amino nitrogen found in the hydrolysates. It seems clear that this hydrolysable unidentified nitrogen (HUN) originates mainly from non-amino nitrogen atoms present in arginine, tryptophan, lysine and proline. These nitrogen atoms do not satisfy the conditions necessary for reaction with ninhydrin. The amounts of each amino acid in a particular protein determine the HUN value which will be obtained for 6N HC1 hydrolysates of that protein. There is good agreement between the HUN values for a wide range of proteins when calculated from the amino acid composition of the protein and when determined experimentally. It is concluded that these findings indicate a considerably higher content of amino acid nitrogen in the organic nitrogen of soils and leaf litter than was previously considered to be the case. It is suggested that the findings support the contention that the organic nitrogen of soils contains leaf protein complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373469
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  • 9
    Electronic Resource
    Electronic Resource
    A tooth at the border of two morphogenetic fields (1993)
    Springer
    Human evolution 8 (1993), S. 187-204 
    Details
    ISSN: 1824-310X
    Keywords: Morphogenetic Fields ; Canines ; Anthropoids ; A. afarensis ; Sexual Dimorphism ; Human Canine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A tooth at the border between two morphogenetic fields (mandibular canine and honing premolar) may become morphologically similar to and/or functionally incorporated with the teeth of either field. In light of this, observations of the morphology and occlusion of female anthropoid C1s from 58 extant species are presented to assess whether and to what extent they exhibit incisor-like form and function. Female C1s in 74% of the taxa observed exhibit well developed incisor-like traits which may reflect field border phenomena. In another 9%, incisor traits are present but they are not examples of field border phenomena. Interspecies variation in female C1 morphology is related to behavior, function, natural selection and phyletic inertia. A selection model, derived from the data, is used to explain C1 sexual dimorphism and the evolution of male and female human canines. The data's relevance to the field vs clone theory debate is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436714
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  • 10
    Electronic Resource
    Electronic Resource
    Canine reduction in early man: A critique of three mechanical models (1990)
    Springer
    Human evolution 5 (1990), S. 213-226 
    Details
    ISSN: 1824-310X
    Keywords: Canines ; Honing ; C/P Complex ; incisors ; hominids ; A. afarensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The possibility that projecting maxillary canines interfere with either a «rotary chewing» form of molar occlusion or the lateral excursion of the mandible has been used to suggest two dietary (non-weapon) selection models for canine reduction in the earliest male humans. A third model explaining canine reduction is based on the idea that a projecting mandibular canine could interfere with its tip-to-tip occlusion with the maxillary lateral incisor. In this paper, these three mechanical models are critically reexamined in light of more recent studies of occlusion in extant primates, detailed observations of anterior tooth morphology and wear in Miocene to Recent anthropoids, cheek tooth microwear inA. afarensis, and the currently accepted phylogeny and fossil record of the great apes and man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02437237
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