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  • 2005-2009  (119)
  • 1985-1989  (46)
  • 1910-1914
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  • 1
    Electronic Resource
    Electronic Resource
    Basic polypeptides accelerate the hydrolysis of ribonucleic acids (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 6880-6882 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00228a045
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative absorption spectroscopy and dissociation dynamics of I2 van der Waals complexes with He, Ar, Kr, and Xe (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 2684-2691 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Noble gas (He, Ar, Kr, and Xe) van der Waals (vdW) complexes of I2 formed in axiosymmetric, pulsed jet expansions were studied by absorption using intracavity laser spectroscopy (ILS). Absorption spectra of I2He, I2Ar, I2Ar2, and I2Ar3 as well as previously undetected I2Kr, I2Kr2, I2Kr3, I2Xe, and I2Xe2 were recorded using B(3Π+0u)←X transitions (Figs. 2–4 and Table I). The formation efficiencies of nine I2–noble gas vdW complexes were studied as a function of expansion conditions (Table II). Comparisons of absorption and laser-induced fluorescence data provide an analysis of excited-state dissociation mechanisms for the overall He, Ar, Kr, and Xe chemical series and as a function of vibrational level populated in the B(3Π+0u) state for I2He and I2Ar. The competition between the electronic and vibrational predissociation of the vdW complex is discussed with respect to absorption data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451078
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  • 3
    Electronic Resource
    Electronic Resource
    Eclipse Prediction and the Length of the Saros in Babylonian Astronomy (2005)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Centaurus 47 (2005), S. 0 
    Details
    ISSN: 1600-0498
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Natural Sciences in General
    Notes: The Saros cycle of 223 synodic months played an important role in Late Babylonian astronomy. It was used to predict the dates of future eclipse possibilities together with the times of those eclipses and underpinned the development of mathematical lunar theories. The excess length of the Saros over a whole number of days varies due to solar and lunar anomaly between about 6 and 9 h. We here investigate two functions which model the length of the Saros found in Babylonian sources: a simple zigzag function with an 18-year period presented on the tablet BM 45861 and a function which varies with the month of the year constructed from rules found on the important procedure text TU 11. These functions are shown to model nature very well and to be closely related. We further conclude that these functions are the likely source of the Saros lengths used to calculate the times of predicted eclipses and were probably known by at latest the mid-sixth-century BC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0498.2005.470301.x
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  • 4
    Electronic Resource
    Electronic Resource
    The “days in excess” from MUL.APIN On the “first intercalation” and “water clock” schemes from MUL.APIN (2005)
    Copenhagen : Munksgaard International Publishers
    Centaurus 47 (2005), S. 0 
    Details
    ISSN: 1600-0498
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0498.2005.00016.x
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  • 5
    Electronic Resource
    Electronic Resource
    Search for catalytic properties of simple polypeptides (1987)
    Springer
    Origins of life and evolution of the biospheres 17 (1987), S. 381-390 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Simple polypeptides were used as possible supports for nucleotide polymerization, in the absence of any preformed polynucleotide template. Sequential copolymers of alanine and glycine, water soluble polypeptides based on arginine and poly(Glu-SerGlu) have been tested. No catalytic effect has been found although poly(Glu-Ser-Glu) favors the 2′–5′ internucleotide linkage. More interestingly, polypeptides containing arginine residues strongly accelerate the hydrolysis of oligoadenylic acids. The influence of pH, temperature, nature of the buffer and polypeptide sequence was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386476
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  • 6
    Electronic Resource
    Electronic Resource
    Selective emergence and survival of early polypeptides in water (1987)
    Springer
    Origins of life and evolution of the biospheres 17 (1987), S. 367-379 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Oligopeptides essential to primitive cells could not be obtained just by raising the background noise of organic compounds produced by a prebiotic chemistry working at random. Selection pathways were required. Experimental evidence is given for selective condensation of amino acids in water as well as for selective resistance to degradation. It is shown that N-carboxyanhydrides are good candidates for chemical selection in water. They are formed when active esters of amino acids are left in the presence of bicarbonate ions or when N,N'-carbonyldiimidazole is used as condensing agent. Polymerization of a mixture of proteinaceous and non-proteinaceous amino acids leads to an enrichment in the proteinaceous ones plusα-aminobutyric acid. Selective resistance toward degradation ofβ-pleated sheet conformation is used to exemplify a possible accumulation of homochiral sequences made of hydrophilic and strong hydrophobic residues. Amino acids with branched aliphatic side-chains are selected but those having short linear aliphatic side-chains such asα-aminobutyric acid or norvaline are not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386475
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  • 7
    Electronic Resource
    Electronic Resource
    Simplified method for wetland habitat assessment (1989)
    Springer
    Environmental management 13 (1989), S. 207-213 
    Details
    ISSN: 1432-1009
    Keywords: Wetlands ; Assessment technique ; Environmental impact ; Habitat evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This article presents a wetland habitat assessment technique (HAT) using birds as indicators of habitat quality. The technique is quick, simple, inexpensive, and lends itself to screening large numbers of wetlands. HAT can provide input to more extensive evaluation techniques. Measures of species diversity and rarity are used to assess the quality of the wetland. By applying the notion of ecologically optimum size, the technique addresses the issue of economic efficiency. Results of field testing HAT on 11 tidally influenced wetlands are presented to illustrate HAT's utility. Application of HAT in a variety of situations is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868367
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of simple polypeptides on nucleotide polymerization (1986)
    Springer
    Origins of life and evolution of the biospheres 16 (1986), S. 452-453 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422129
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  • 9
    Electronic Resource
    Electronic Resource
    Emergence and survival of protein-like peptides in water (1986)
    Springer
    Origins of life and evolution of the biospheres 16 (1986), S. 486-486 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422150
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1989)
    Springer
    Origins of life and evolution of the biospheres 19 (1989), S. 73-78 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808289
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