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  • 2000-2004  (105)
  • 1985-1989  (46)
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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
    The Path of the Moon, the Rising Points of the Sun, and the Oblique Great Circle on the Celestial Sphere (2003)
    Copenhagen : Munksgaard International Publishers
    Centaurus 45 (2003), 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.1600-0498.2003.450103.x
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  • 3
    Electronic Resource
    Electronic Resource
    Amino acids from ultraviolet irradiation of interstellar ice analogues (2002)
    [s.l.] : Nature Publishing Group
    Nature 416 (2002), S. 403-406 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Amino acids are the essential molecular components of living organisms on Earth, but the proposed mechanisms for their spontaneous generation have been unable to account for their presence in Earth's early history. The delivery of extraterrestrial organic compounds has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/416403a
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  • 4
    Electronic Resource
    Electronic Resource
    Photoemission studies of ZnSe epilayers grown on GaAs(111)B surface (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 710-717 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth and characterization of ZnSe epilayers on GaAs(111)B was studied. Insight into the formation mechanism of this type of surface, interface, and bulk has been provided by photoemission spectroscopy. When Zn and Se are deposited, Se reacts with As to form Se–As bonds. Therefore, the electron mean free path obtained from the intensity variation of the surface As layer is less than that from the As bulk intensity since its emission is transferred from the surface peak into chemically shifted As peak. Deposition of ZnSe results in a substrate core level shift of 0.59 eV toward lower binding energy. A value of 0.91 eV for the valence band offset, with the valence band maximum of ZnSe below that of GaAs, was obtained. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1327606
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Three-dimensional modelling of an isolated carbonate buildup (Triassic, Dolomites, Italy) (2004)
    Oxford, UK : Blackwell Science Ltd
    Sedimentology 51 (2004), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Middle Triassic carbonate buildups of the Dolomites show facies similarities with mud mounds but display apparent architectural elements of flat-topped carbonate platforms. In order to test whether the facies similarities to mounds are also reflected in the internal buildup architecture, a three-dimensional modelling study of the Middle Triassic Monte Cernera buildup has been carried out. The Cernera buildup exhibits apparent geometries suggesting a mounded platform in the lower and uppermost part of the buildup, separated by an interval with apparent platform geometry and a retrogradational platform interior, which is difficult to explain with a flat top platform model. For this purpose, a number of three-dimensional models were constructed using the three-dimensional modelling programme petrelTM. Key geological horizons were constructed based on outcrop measurements, intermediate horizons were calculated in the modelling program, and the intersections of the modelled layers with a digital topography surface were displayed and compared with outcrop photographs. The models were refined stepwise until a best fit with the actual bedding architecture was achieved. The best fit model shows that the mounded geometries in the lower and uppermost part of the buildup are real architectural elements. The intermediate platform stage, about 1·5 km across, had probably retained a mounded top with a relief of up to 50 m, which is difficult to distinguish from an absolutely flat top, but necessary to explain the retrogradational platform interior. The present study shows that Monte Cernera was dominated by mounded geometries at all stages of platform development. The mounded geometry plus facies data suggest that the platform is a deep-water accumulation, below the zone of intense wave energy, but within the photic zone. The Cernera represents a tropical buildup type, which did not have the capacity to grow into continuously wave-swept environments because of the small size and the absence of a wave-resistant energy barrier. Such buildup types are probably common after major crises in earth history, when reef organisms were virtually absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.2003.00622.x
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclicities in Triassic platform carbonates: synchronizing radio-isotopic and orbital clocks (2003)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 15 (2003), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Sedimentary cycles recorded in young sediments are often attributed to fluctuations of the Earth's climate on a 104−106-year scale which in turn is governed by periodic variations in solar insolation linked to orbital (Milankovitch) parameters. A spectacular example of cyclic stratal patterns in ancient deposits is the Middle Triassic Latemar carbonate platform (W Dolomites, N Italy). Based on spectral analyses from previous studies, a superimposition of precession (∼20 ka) and eccentricity (∼100 ka) controlled sea-level fluctuations has been suggested to account for the stacking hierarchy at Latemar, with ∼20 ka being assigned to each highest-order depositional cycle. Zircon U–Pb isotopic ages from volcanic-ash layers within the cyclic succession, corroborated by biostratigraphic constraints, suggest that the average time interval for every individual cycle is significantly smaller than the shortest Milankovitch period and therefore challenge previously published interpretations relating distinct spectral peaks to the above mentioned hierarchy. However, our new spectral data indicate that cyclicities resembling Milankovitch characteristics might exist, but on an entirely different scale. Our findings show that frequency spectra should only be interpreted in combination with robust age control. They also encourage the search for complementary mechanisms controlling carbonate deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2003.00475.x
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  • 8
    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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  • 9
    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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  • 10
    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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