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  • 1
    Electronic Resource
    Electronic Resource
    Structure- and Orientation-Dependent Magnetic Susceptibility of Tetramethylammonium Nickel Nitrite, (CH3)4N[Ni(NO2)3]: An S = 1 One-Dimensional Heisenberg Antiferromagnet (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 2051-2055 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00047a026
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  • 2
    Electronic Resource
    Electronic Resource
    A Novel, Soluble Poly(diacetylene) Containing an Aromatic Substituent (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 1819-1824 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00085a023
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of diacetylene polymerization: an FT-Raman study (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 5954-5958 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00074a017
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of single and repeated experimental acid pulses on invertebrates in a high altitude Sierra Nevada stream (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 32 (1994), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. We examined responses of aquatic macroinvertebrates to pulsed acidification experiments in twelve streamside channels located in the Sierra Nevada, California. Experiment 1 consisted of a single 8 h acid addition, and Experiment 2 consisted of two 8 h acid additions administered 2 weeks apart. Replicated treatments (four reps/ treatment) consisted of a control (pH 6.5–6.7) and pH levels of 5.1–5.2 and 4.4–4.6. Invertebrate drift was monitored continuously and benthic densities were determined before and after acid addition.2. Drift responses to pH reduction were: (i) increased drift during acidification in pH 5.2 and pH 4.6 treatment channels, often with depressed post-acidification drift in treatment channels relative to controls (exhibited by Baetis only). Depressed post-acidification drift in treatment channels appeared to be due to low benthic densities because a positive relationship between benthic and drift densities was noted for most common taxa; (ii) increased drift rates during acidification only at pH 4.6 (Epeorus, Drunella, Paraleptophlebia, Zapada, and Simulium); (iii) decreased drift at pH 5.2 and/or pH 4.6 relative to control channels (Rhyacaphila and chironomid larvae); (iv) no significant response to acidification (Ameletus, Amiocentrus, Dixa and Hydroporus).3. A high proportion (45–100%) of acid-induced drift in Baetis, Epeorus, and chironomid larvae could be attributed to dead, drifting individuals.4. Except for chironomids, most common invertebrates (i.e. Baetis and Paraleptophlebia) showed reduced benthic densities in treatment relative to control channels after acidification.5. For sensitive taxa, drift was enhanced and benthic densities reduced by single (Experiment 1) and initial [Experiment 2(a)] acid pulses. Drift responses to a second acid pulse [Experiment 2(b)] were not as pronounced as those to the single or initial acid pulses [Experiments 1 and 2(a)], and the second acid pulse had no additional effect on benthic density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1994.tb00875.x
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  • 5
    Electronic Resource
    Electronic Resource
    Responses of zooplankton and zoobenthos to experimental acidification in a high-elevation lake (Sierra Nevada, California, U.S.A.) (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 23 (1990), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. During the summer of 1987 we conducted an acidification experiment using large enclosure at Emerald Lake, a dilute, high-elevation lake in the Sierra Nevada, California, U.S.A. The experiment was designed to examine the effects of acidification on the zooplankton and zoobenthos assemblages of Sierran lakes.2. Treatments consisted of a control (pH 6.3) and pH levels of 5.8, 5.4, 5.3, 5.0 and 4.7; each treatment was run in triplicate. The experiment lasted 35 days.3. The zooplankton assemblage was sensitive to acidification. Daphnia rosea Sars emend. Richard and Diaptomns signicauda Lilljeborg decreased in abundance below pH 5.5–5.8, and virtually disappeared below pH 5.0. Bosmina longirostris (Müller) and Keratella taurocephala Ahlstrom became more abundant with decreasing pH. although B. longirostris was rare in the pH 4.7 treatment. These species might serve as reliable indicators of early acidification in lakes such as Emerald Lake.4. The elimination of D. rosea in acidified treatments probably allowed the more acid-tolerant taxa to increase in abundance because interspecific competition was reduced. Even slight acidification can therefore alter the structure of the zooplankton assemblage.5. In contrast to the zooplankton, there was no evidence that the zoobenthos in the enclosures was affected by acidification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1990.tb00296.x
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  • 6
    Electronic Resource
    Electronic Resource
    Formulation and solution of hyperbolic Stefan problem (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1190-1197 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interface condition for hyperbolic phase change problems, which includes sensible heat at the interface, is derived as an extension of the interface condition for standard parabolic phase change problems. The enthalpy formulation of the hyperbolic Stefan problem is presented and is used to numerically solve for the temperature distributions and the interface position. MacCormack's predictor–corrector method is applied to solve the hyperbolic phase change problem and is validated by comparing the limiting case where the thermal relaxation parameter approaches zero to the parabolic phase change problem, in which the relaxation parameter is zero. Solutions with an applied surface temperature greater than the melt temperature are presented for two different Stefan numbers. It is noted that a discontinuity occurs at the phase change interface as well as at the thermal front.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349572
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  • 7
    Electronic Resource
    Electronic Resource
    Hyperbolic heat conduction due to axisymmetric continuous or pulsed surface heat sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5478-5485 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Irradiation of metals with laser pulses in the nanosecond to picosecond range may give rise to temperature fields which are significantly different from those predicted by the classical Fourier heat conduction model. In this work we examine the very short-time temperature response of a semi-infinite region to an axisymmetric laser surface source, which is either continuous or activated for a period Δt and has a spatial profile which is Gaussian, doughnut, or a combination of the Gaussian and doughnut modes. The material properties are assumed constant, and radiation and convection from the irradiated surface are neglected. The non-Fourier temperature responses are compared with their diffusive counterparts and shown to give rise to steep local temperature concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347006
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  • 8
    Electronic Resource
    Electronic Resource
    Homologous linear plasmids in mitochondria of three species of wheat bunt fungi, Tilletia caries, T. laevis and T. controversa (1990)
    Springer
    Current genetics 17 (1990), S. 229-233 
    Details
    ISSN: 1432-0983
    Keywords: Linear plasmids ; Mitochondria ; Wheat ; Bunt fungi ; Tilletia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary All isolates of Tilletia spp. investigated (five isolates of T. caries, including one from Japan, two isolates of T. laevis, and five isolates of T. controversa) contained a linear DNA plasmid ranging in size from 7.2 to 7.6 kb. All plasmids were highly homologous to each other as shown by DNA-DNA hybridization and comparison of restriction enzyme sites. Variability in the size of the plasmid was found to be due to differences within a central region of the plasmid. No homology between the plasmid and mitochondrial or nuclear DNA was found, but the mitochondrial origin of the plasmid was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312614
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  • 9
    Electronic Resource
    Electronic Resource
    A region of heterogeneity adjacent to the 5s ribosomal RNA gene of cereal rusts (1992)
    Springer
    Current genetics 22 (1992), S. 101-105 
    Details
    ISSN: 1432-0983
    Keywords: Intergenic region ; Stem rusts ; Puccinia graminis ; Leaf rusts ; Cereals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Total genomic DNA was isolated from three cereal stem rusts, Puccinia graminis f. sp. tritici, f. sp. secalis, f. sp. avenae, and two cereal leaf rusts, P. recondita f. sp. tritici and P. coronata f. sp. avenae, and analyzed for the presence of heterogeneity in the intergenic region of the ribosomal DNA repeat unit. A 1 kb region of the repeat unit between the 26s and the 5s rRNA genes (IGR-1) was amplified by PCR and was found to be heterogeneous within each isolate and variable in size between races and species. The PCR results were confirmed by Southern blot analysis of native DNA. In an isolate of race C36(48), heterogeneity appeared to be due to variable numbers of 0.1 kb subrepeats in IGR-1. Nine wheat stem rust strains representing nine different races produced a unique pattern of heterogeneity while two different isolates of one race were identical, as were five of another. This may provide a rapid method for race identification in wheat stem rust. Heterogeneity and polymorphism in rye stem rust, oat stem rust, wheat leaf rust, and oat crown rust, was less pronounced than in wheat stem rust. In the course of this work, the 5s rRNA gene was located and its position and orientation within the ribosomal repeat unit was established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351468
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  • 10
    Electronic Resource
    Electronic Resource
    A region of heterogeneity adjacent to the 5s ribosomal RNA gene of cereal rusts (1993)
    Springer
    Current genetics 23 (1993), S. 373-373 
    Details
    ISSN: 1432-0983
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310903
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