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  • 1
    Electronic Resource
    Electronic Resource
    Formation and Transport of Deethylatrazine and Deisopropylatrazine in Surface Water (1994)
    s.l. : American Chemical Society
    Environmental science & technology 28 (1994), S. 2267-2277 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00062a005
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  • 2
    Electronic Resource
    Electronic Resource
    Herbicides in surface waters of the midwestern United States: the effect of spring flush (1991)
    s.l. : American Chemical Society
    Environmental science & technology 25 (1991), S. 1794-1796 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00022a018
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  • 3
    Electronic Resource
    Electronic Resource
    Grain Boundary Structure in NiO, Temperature Evolution: A Molecular Dynamics Study (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 126-128 (Jan. 1993), p. 229-232 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.126-128.229.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term productivity in the cryptoendolithic microbial community of the Ross Desert, Antarctica (1993)
    Springer
    Microbial ecology 25 (1993), S. 51-69 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Annual gross productivity of the lichen-dominated cryptoendolithic community was calculated from a computer analysis of photosynthetic response based on laboratory measurements of C02 exchange and three years (1985–1988) of field nanoclimate data. Photosynthetic optimum increased from −3 to 2°C between irradiance levels of 100 and 1500 μmol photons m−2 s−1, while the upper compensation point rose from 1 to 17°C. The mean yearly total time available for metabolic activity (temperature above −10°C and moisture present) was 771.3 h for horizontal rock, 421.5 h for northeast-oriented sloped rock, and 1042.2 h for a small depression in horizontal rock (the characteristic site of occasional lichen apothecia). The calculated mean gross productivity value for a horizontal rock was 1215 mg C m−2 y−1, and net photosynthetic gain was 606 mg C m−2 y−1. Net ecosystem productivity (annual accretion of cellular biomass) estimated from long-term events amounted to only about 3 mg C m−2 y−1. The difference between these two values may represent the long-term metabolic costs of the frequent dehydration-rehydration and freezing-thawing cycles or of overwintering, and may account for the leaching of organic substances to the rock. The yearly gross productivity of the cryptoendolithic microbial community of the entire Ross Desert area was estimated at approximately 120,000–180,000 kg C. Of this, 600–900 kg C is in microbial biomass, and much of the rest is soluble compounds that leach into the rocks and possibly percolate to the valleys, providing a source of organic matter for lakes, rivers, and soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182129
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular dynamics of a plastic crystal with two types of orientational disorder: Static and dynamic properties of plastic bicyclooctane (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1313-1324 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A molecular dynamics simulation of a realistic model of bicyclo-octane [HC(CH2–CH2)3CH] in its plastic phase has been performed at three different temperatures. The interactions between the molecules of the simulated system are calculated with phenomenological exp-6 additive atom–atom potentials. The molecules are considered rigid and their equations of motion are integrated using a method of constraints. A special attention is given to the problem of the C–H bond value. The static analysis of the molecular dynamics (MD) results yields a clear description of two types of orientational order: It confirms the experimental results about the equipartition of the molecular threefold axes around the eight 〈111〉 crystallographic axes and it furthermore unambiguously shows the existence of six preferred orientations for the orientational order of the molecules around their threefold axes where a previous experimental work concluded in favor of a quasifree rotation. The mean-square displacement amplitudes of the molecular centers of mass reveal that our simulation model is not impeded by the abnormal behavior of the exp-6 potentials at small interactive distances. From a dynamical point of view, the molecular dynamics scheme clearly shows that the jumps are not instantaneous and are slightly more diverse than previously assumed. In order to achieve a precise description of these jumps, we propose to make a conceptual distinction between the mean residence times and the correlation times. By contrast with a former MD simulation, our model gives two sets of distinct characteristic times which perfectly agree with the experimentally deduced values. Given the simplifying assumptions entering the experimental models, the quality of this latter agreement also shows a certain lack of sensitivity vis a¯ vis the exact nature of the underlying microscopic mechanisms. We also examined the ability of our model to simulate the behavior of a monovacancy. We found the influence of such a defect on its immediate neighborhood to be very small even when considering the nature of the complex orientational (dis)order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459143
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of adsorption of an amphiphilic molecule near a liquid-liquid interface (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 10723-10729 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100179a039
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  • 7
    Electronic Resource
    Electronic Resource
    Mössbauer study of Fe-substituted Co-Zr and Cu-Zr metallic glasses (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 269-274 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of pseudobinary Co-Zr and Cu-Zr metallic glasses, where Co and Cu were substituted by Fe, was studied by means of 57Fe-Mössbauer spectroscopy. The resulting spectra can be divided into two different classes: (1) For Zr concentrations larger than 67 at. %, the structure of the glass, as derived from Mössbauer spectroscopy, is nearly independent from a substitution, leading to only small changes of the average isomer shifts and quadrupole splittings. These small variations of hyperfine parameters can be ascribed to charge transfer effects. (2) For lower Zr contents, pronounced systematic changes of hyperfine parameters occur upon Co or Cu substitution. Beyond changes of the average hyperfine values, the corresponding quadrupole-splitting distributions become dependent on the degree of substitution, i.e., there is a concentration dependent splitting into two peaks. For the amorphous binary Zr-Fe system, these two peaks have been connected to two amorphous phases with concentrations near Zr2Fe and ZrFe2. At least for the Fe-doped Cu-Zr metallic glasses it could be demonstrated that Fe does not substitute the Cu sites but rather creates preferred environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347127
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  • 8
    Electronic Resource
    Electronic Resource
    Betaines and free amino acids in salt stressed vitroplants and winter resting buds of Populus trichocarpa X deltoides (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 83 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Organic solutes, in particular glycine betaine and proline, have been detected as osmoprotective compounds in many microorganisms and herbaceous species. However, for woody plants, very little information is available on mechanisms of adaptation to salt stress. In the present study, effects of NaCI treatment on betaine and free amino acid contents in a clone of Populus trichocarpa X deltoides micropropagated vitroplants were analyzed using HPLC and silicate plate chromatography. The application during 12 days of 50 to 200 mM NaCI to viroplants cultured on Murashige and Skoog medium (Murashige and Skoog 1962. Physiol. Plant. 15: 473–497) led to a progressive decrease of growth, leaf senescence, abscission, and apical necrosis. Populus trichocarpa X deltoides was characterized by the absence of glycine betainc and/or proline accumulation. However, trigonelline was found to increase in vitroplants subjected to 100 mM NaCI. Trigonelline was also present in dormant buds harvested in natural conditions and missing in active buds. In vitroplants, the content of some amino acids was strongly modified by salt stress. A progressive accumulation of alanine and γ-amino butyrate was particularly significant in roots, whereas the relative concentration of glutamine was strongly enhanced in leaves. Leaf content of glutamate and ornithine attained maximum in the presence of 100 and 150 mM NaCI concentrations, and then decreased. Arginine and serine pools were not significantly modified by salt treatment. The variations in vitroplants were of small amplitude compared to those observed in mature poplars where winter rest was associated with a very high arginine level and with a disappearance of nearly all other free amino acids. The results are discussed in relation to previous data obtained with herbaceous species and in relation to some metabolic pathways in poplars where trigonelline could be considered as a sensitive stress indicator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb01292.x
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  • 9
    Electronic Resource
    Electronic Resource
    Incommensurately modulated structure of γ-PAMC: new experimental evidence for amplitude and phase fluctuations (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 333-343 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193011425
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  • 10
    Electronic Resource
    Electronic Resource
    Wärmeleitfähigkeit, Viskosität und Dichte des Gemisches Vitamin E/CO2 bis 40 MPa und 150°C: Meßsysteme und Versuchsergebnisse (1994)
    Springer
    Heat and mass transfer 29 (1994), S. 391-398 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Abstract Experimental investigations on thermal conductivity and dynamic viscosity of the mixture Vitamin E (α-Tocopherol)/CO2 up to 40 MPa and 150°C are described. The measuring devices especially developed for these investigations work very satisfactory: Thermal conductivity has been measured by the transient hot-wire method and viscosity by a newly developed instrument that uses the principle of a torsional vibration viscometer. An attempt was made to fit the results to simple empirical equations. This was successful for density and thermal conductivity but not for viscosity.
    Notes: Zusammenfassung Die vorliegende Arbeit behandelt experimentelle Untersuchungen der Wärmeleitfähigkeit, der Dichte und der Viskosität am System Vitamin E (α-Tocopherol)/CO2 bis zu Drücken von 40 MPa und Temperaturen von 150°C. Die dazu entwickelten Meßsysteme haben sich bewährt: Zur Erfassung der Wärmeleitfähigkeit wurde das Prinzip des instationären Hitzdrahtes angewendet. Die neuartige Sonde zur Erfassung der Viskosität arbeitet nach dem Prinzip eines hochfrequenten Torsions-Schwingviskosimeters. Es wurde versucht, die Meßergebnisse durch bekannte und einfache Modell-Gleichungen abzubilden. Bei der Dichte und der Wärmeleitfähigkeit ist dies weitgehend gelungen. Ein Abbilden des Viskositätsverhalten scheiterte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01878351
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