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  • 1
    Electronic Resource
    Electronic Resource
    Localization of Excitations by Electron-Donating Side Groups in the Novel Copolymer Poly[methylphenyl-co-methyl-4-(dimethylamino)phenylsilane] (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 7359-7365 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100081a021
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  • 2
    Electronic Resource
    Electronic Resource
    Genetically Engineered Secretion of Active Human Interferon and a Bacterial Endoglucanase from Aspergillus Nidulans (1987)
    [s.l.] : Nature Publishing Company
    Nature biotechnology 5 (1987), S. 713-719 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Secretion of biologically active human interferon α2 and a bacterial (Cellulomonas fimi) endoglucanase from Aspergillus nidulans is described. The genes encoding these proteins were linked to NH2–terminal fungal secretion signal sequences, synthetic or natural, and expression was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt0787-713
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  • 3
    Electronic Resource
    Electronic Resource
    Stone Implements from Western Nigeria (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 124-124 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 lists the definite artefacts found. The material is mainly quartz from the basement complex. Polished stone axes are common in Nigeria, where they are often used as protective charms against thieves and thunder, in the belief that they are fallen thunderbolts. Flaked and tanged implements, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/184124a0
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  • 4
    Electronic Resource
    Electronic Resource
    Carbon and water relations of Salix monticola in response to winter browsing and changes in surface water hydrology: an isotopic study using δ13C and δ18O (1999)
    Springer
    Oecologia 120 (1999), S. 375-385 
    Details
    ISSN: 1432-1939
    Keywords: Key words Stable isotopes ; Plant-animal interactions ; Rocky Mountain National Park ; Riparian ecosystems ; Ungulates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To ascertain whether browsing or hydrologic conditions influence the physiological performance of Salix and whether Salix and graminoids (Carex) use and possibly compete for similar water resources, we quantified the in situ seasonal patterns of plant water and carbon relations over three growing seasons. Our studies were designed to address the physiological factors which may be responsible for poor woody plant regeneration in montane riparian habitats of Rocky Mountain National Park, Colo. As these systems act to insure the delivery of fresh water to downstream users, the maintenance of their integrity is critical. We quantified plant water potentials, instantaneous rates of carbon fixation, leaf carbon isotope discrimination (Δ), leaf nitrogen content and water sources using stable isotopes of water (δ18O). The carbon and water relations of Salix were significantly affected by winter browsing by elk and in some cases by landscape position with regard to proximity to active streams. Winter browsing of Salix by elk significantly increased summer plant water potentials and integrative measures of gas exchange (Δ), though browsing did not consistently affect instantaneous rates of photosynthesis, leaf nitrogen or the sources of water used by Salix. No effect of experimental manipulations of surface water conditions on Salix physiology was observed, likely due to the mesic nature of our study period. Using a two-member linear mixing model, from δ18O values we calculated that Salix appears to rely on streams for approximately 80% of its water. In contrast, the graminoid Carex derives almost 50% of its water from rainfall, indicating divergent water source use by these two life forms. Based on these findings, winter browsing by elk improved Salix water balance possibly by altering the shoot to root ratio which in turn leads to higher water potentials and higher degrees of season-long gas exchange, while experimental damming had in general no effect on the physiological performance of Salix plants. In addition, as the water sources of Salix and Carex were significantly different, competition for water may not influence the growth, development, and regeneration of Salix. Thus, under the conditions of our study, herbivory had a positive effect on the physiological performance of Salix, but it is still unclear whether these changes in physiology transcend into improved Salix regeneration and survivorship. However, under drier environmental conditions such as lower snowpacks and lower stream flows, the browsing resistance of Salix and ecosystem regeneration may be greatly hindered because the reliance of Salix on stream water makes it vulnerable to changes in surface water and hydrological conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050870
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  • 5
    Electronic Resource
    Electronic Resource
    Dependent oedema and attenuation of postural vasoconstriction associated with nifedipine therapy for hypertension in diabetic patients (1989)
    Springer
    European journal of clinical pharmacology 37 (1989), S. 333-335 
    Details
    ISSN: 1432-1041
    Keywords: diabetes mellitus ; nifedipine ; hypertension ; oedema ; vasodilator ; blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We studied the incidence of oedema 2 weeks following initation of nifedipine therapy for hypertension in a group of 10 diabetic subjects, and also measured skin blood flow (SBF) with a laser Doppler flowmeter, before and after lowering the foot. SBF with the foot horizontal increased after nifedipine from 0.31V (arbitrary units of flow) to 0.51V (NS). The postural fall in blood flow in dependency was significantly attenuated by nifedipine from 64.4 to 24.0%. Five patients developed ankle oedema. Results were similar in a small group of non-diabetic subjects starting nifedipine. The attenuation of reflex postural vasoconstriction is therefore likely to contribute to development of the oedema associated with starting nifedipine therapy, which should be monitored carefully in diabetic patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558495
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  • 6
    Electronic Resource
    Electronic Resource
    Phenylalanine fluorescence and phosphorescence used as a probe of conformation for cod parvalbumin (1993)
    Springer
    Journal of fluorescence 3 (1993), S. 57-64 
    Details
    ISSN: 1573-4994
    Keywords: Parvalbumin ; phenylalanine ; fluorescence ; phosphorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fluorescence emission and triplet absorption properties of phenylalanine in cod fish parvalbumin type II, a protein that contains no Trp or Tyr, was examined in the time scale ranging from nanoseconds to microseconds at 25°C in aqueous buffer (pH 7.0). In the presence of Ca(II), the decay of fluorescence gave two lifetimes (5.9 and 53 ns) and the triplet lifetime was 425 μs. Upon removal of Ca, the fluorescence intensity decreased to values approaching that for free Phe, while the longest fluorescence decay component was 17 ns. At the same time, the decay of triplet showed complex nonexponential kinetics with decay rates faster than in the presence of Ca. Quenching and denaturation analyses suggest that the Phe's are present in a hydrophobic environment in the Ca-bound protein but that the Ca-free protein is relatively unstructured. It is concluded that Phe luminescence in proteins is sensitive to conformation and that the long lifetime of Phe excited states needs to be considered when studying its photochemistry in proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00865318
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  • 7
    Electronic Resource
    Electronic Resource
    Near-field time-resolved fluorescence studies of poly(phenylmethyl silane) with subwavelength resolution (1994)
    Springer
    Journal of fluorescence 4 (1994), S. 137-140 
    Details
    ISSN: 1573-4994
    Keywords: Time-correlated single-photon counting ; near-field fluorescence ; poly(phenylmethyl) silane ; subwavelength resolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an example of the first time-correlated single-photon counting (TCSPC) near-field optical measurement. The aperture size of our prepared aluminun-coated fiber-optic probe was approximately 50 nm, which represents a spatial resolution of λex/7 for our UV measurements. Near-field fluorescence decays of poly(phenylmethyl silane) in solid thin films excited in the range 325–360 nm were obtained and the steady-state excitation spectra compared with the excitation spectral information obtained in the far field. Fluorescence decays showed single exponential lifetimes ranging from 45 to 277 ps, which was dependent on the excitation wavelength and the selected near-field tip. The proximity of the metal-coated tip to the sample may be the reason for the modulation in fluorescence lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881881
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  • 8
    Electronic Resource
    Electronic Resource
    On the structure of the alpha particle (1988)
    Springer
    The European physical journal 331 (1988), S. 239-242 
    Details
    ISSN: 1434-601X
    Keywords: 21.40.+d ; 21.30.+y ; 25.30.Bf ; 27.10.+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using very high resolution electron scattering data, we demonstrate that the ground state structure of4He has C3v point group symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01355593
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  • 9
    Electronic Resource
    Electronic Resource
    Multi-quark hamiltonian and the nuclear force (1990)
    Springer
    The European physical journal 336 (1990), S. 321-332 
    Details
    ISSN: 1434-601X
    Keywords: 21.30.+y ; 12.38.Lg ; 21.10.Dr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a system of simple rules which give the binding energy and approximate ground state structure of a nucleus, dependent only on the number of protons and neutrons making it up. This “nuclear code” is based on theN-quark Schrödinger equation and uses ideas familiar from atomic chemistry. We demonstrate some of the important ramifications by computing the4He elastic form factor. The nuclear code performs better than its atomic counterpart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292864
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of temperature on polyacrylate-and CMC-treated drilling muds (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 1015-1022 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Viscometric and filtration properties have been studied at 80°F. and at elevated temperature for a saturated gypsum mud and a 20,000 ppm sodium chloride mud, treated with an acrylate-acrylamide copolymer (0.62 mole fraction sodium acrylate) and with sodium carboxymethyl cellulose (CMC). In the muds containing CMC and also for the acrylic polymer in the sodium system, the observed plastic viscosity decrease (at 175°F.) and the API filter loss increase (at 200°F.) were about what one would predict from the change in the viscosity of water with temperature. In contrast, the polyacrylate-treated gypsum mud showed a viscosity increase, rather than a decrease, at the elevated temperature, and the API filter loss increased to a level substantially greater than would have been predicted on the basis of the change in the viscosity of water. This anomalous behavior of the acrylate-treated system is interpreted as evidence of polymer-calcium ion-clay interaction. Data are presented to illustrate the extent of degradation of the acrylic polymer and CMC in a gypsum mud when heated for 16 hr. at 350°F. under a nitrogen atmosphere. The room temperature filter loss of the acrylate-treated mud was scarcely changed after this treatment, while the filter loss of the CMC-treated system was comparable to that of the blank mud. These results show that, from an operational point of view, CMC was completely degraded. Despite the apparent stability of the acrylic polymer, its usefulness is severely restricted by the high viscosities and filtration rates observed at elevated temperatures in the presence of calcium ions.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080237
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