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  • 1
    Electronic Resource
    Electronic Resource
    Effects of supraoptimal temperatures on the myxomycetePhysarum polycephalum (1974)
    Springer
    Archives of microbiology 95 (1974), S. 357-363 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In experiments using an inhibitor of protein synthesis cycloheximide it was shown that the thermal injury of thePhysarum polycephalum plasmodia produced by 10 min heatings at 41°C can be repaired without involvement of concomittant protein synthesis. Resumption of the protoplasmic streaming halted by heat shocks served as an indicator of the repair of thermal injury. Repair of the thermal injury attainable only through sclerotization of plasmodia following 10 min heat shocks at 43°C is blocked by cycloheximide as well as by transfer of the heated cultures to a “starvation” medium (no peptone and yeast extract). Three h period of starvation as well as inhibition of protein synthesis for 3 h prior to heating accelerates the heat-induced transformation of plasmodia into sclerotia and lowers the temperature threshold of metabolic transformations required for sclerotization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451777
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  • 2
    Electronic Resource
    Electronic Resource
    Transport cross sections for charged particle scattering in (dense-) cesium plasma; electrical conductivity
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 152 (1988), S. 365-383 
    Details
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4371(88)90194-X
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of temporary reductions in feeding on protein synthesis and energy storage of juvenile Atlantic salmon (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 49 (1996), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Biochemical and tissue-composition indices were used to determine the impacts of temporary feeding reductions on juvenile Atlantic salmon (4.2g initial weight). Three levels of food reduction (fasting, 20% of control, 50% of control) lasting for 2, 4 or 8 days were compared to a control group (constant feeding at 2.75% of body weight day−1). Ornithine decarboxylase (ODC) activity and RNA concentrations were used to measure changes in protein synthesis; condition factor (K), liver-somatic index (LSI), visceral-somatic index (VSI), and gut index (GI)were used to provide information on stored energy levels. Results showed that physiological adjustments to decreases or increases in feeding occur very quickly. The most rapid responses were changes in ODC activity (within 2 days) and LSI (2–4 days). Changes in RNA concentrations and K required 4–8 days. There was no apparent effect of the treatments on VSI or GI. Temporary reductions of feeding lasting 2 days or less would not be detected by any index except ODC activity. Changes in the indices are discussed with respect to short-term changes in rates of protein synthesis and energy storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1996.tb00022.x
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  • 4
    Electronic Resource
    Electronic Resource
    Finite-beta equilibria for Wendelstein 7-X configurations using the Princeton Iterative Equilibrium Solver code (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1246-1252 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fixed- and free-boundary equilibria for Wendelstein 7-X (W7-X) [W. Lotz et al., Plasma Physics and Controlled Nuclear Fusion Research 1990 (Proc. 13th Int. Conf. Washington, DC, 1990), (International Atomic Energy Agency, Vienna, 1991), Vol. 2, p. 603] configurations are calculated using the Princeton Iterative Equilibrium Solver (PIES) [A. H. Reiman et al., Comput. Phys. Commun., 43, 157 (1986)] to deal with magnetic islands and stochastic regions. Usually, these W7-X configurations require a large number of iterations for PIES convergence. Here, two methods have been successfully tested in an attempt to decrease the number of iterations needed for convergence. First, periodic sequences of different blending parameters are used. Second, the initial guess is vastly improved by using results of the Variational Moments Equilibrium Code (VMEC) [S. P. Hirshmann et al., Phys. Fluids 26, 3553 (1983)]. Use of these two methods have allowed verification of the Hamada condition and tendency of "self-healing" of islands has been observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873367
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and water relations of Tamarix ramosissima and Populus euphratica on Taklamakan desert dunes in relation to depth to a permanent water table (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The hypothesis that water relations and growth of phreatophytic Tamarix ramosissima Ledeb. and Populus euphratica Oliv. on dunes of varying height in an extremely arid Chinese desert depend on vertical distance to a permanent water table was tested. Shoot diameter growth of P. euphratica was inversely correlated with groundwater depth (GD) of 7 to 23 m (adj. R2 = 0.69, P = 0.025); growth of T. ramosissima varied independent of GD between 5 and 24 m (P = 0.385). Pre-dawn (pd) and midday (md) water potentials were lower in T. ramosissima (minimum pd −1.25 MPa, md −3.6 MPa at 24 m GD) than in P. euphratica (minimum pd −0.9 MPa, md −3.05 MPa at 23 m GD) and did not indicate physiologically significant drought stress for either species. Midday water potentials of P. euphratica closely corresponded to GD throughout the growing season, but those of T. ramosissima did not. In both species, stomatal conductance was significantly correlated with leaf water potential (P. euphratica: adj. R2 = 0.84, P 〈 0.0001; T. ramosissima: adj. R2 = 0.64, P = 0.011) and with leaf-specific hydraulic conductance (P. euphratica: adj. R2 = 0.79, P = 0.001; T. ramosissima: adj. R2 = 0.56, P = 0.019); the three variables decreased with increasing GD in P. euphratica. Stomatal conductance of P. euphratica was more strongly reduced (〉 50% between −2 and −3 MPa) in response to decreasing leaf water potential than that of T. ramosissima (30% between −2 and −3 MPa). Tolerance of lower leaf water potentials due to higher concentrations of leaf osmotically active substances partially explains why leaf conductance, and probably leaf carbon gain and growth, of T. ramosissima was less severely affected by GD. Additionally, the complex below-ground structure of large clonal T. ramosissima shrub systems probably introduces variability into the assumed relationship of xylem path length with GD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.01009.x
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  • 6
    Electronic Resource
    Electronic Resource
    Use of decreasing foliar carbon isotope discrimination during water limitation as a carbon tracer to study whole plant carbon allocation (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 25 (2002), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Foliar carbon isotope discrimination (Δ) of C3 plants decreases in water-deficit situations as discrimination by the photosynthetic primary carboxylation reaction decreases. This diminished Δ in leaves under water deficit can be used as a tracer to study whole plant carbon allocation patterns. Carbon isotope composition (δ13C value) of leaf hot water extracts or leaf tissue sap represents a short-term integral of leaf carbon isotope discrimination and thus represents the δ13C value of source carbon that may be distributed within a plant in water-deficit situations. By plotting the δ13C values of source carbon against the δ13C values of sink tissues, such as roots or stems, it is possible to assess carbon allocation to and incorporation into sink organs in relation to already present biomass. This natural abundance labelling method has been tested in three independent experiments, a one-year field study with the fruit tree species Ziziphus mauritiana and peach (Prunus persica), a medium-term drought stress experiment with Ziziphus rotundifolia trees in the glasshouse, and a short-term drought stress experiment with soybean (Glycine max). The data show that the natural abundance labelling method can be applied to qualitatively assess carbon allocation in drought-stressed plants. Although it is not possible to estimate exact fluxes of assimilated carbon during water deficit the method represents an easy to use tool to study integrated plant adaptations to drought stress. In addition, it is a less laborious method that can be applied in field studies as well as in controlled experiments, with plants from any developmental stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2002.00838.x
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of sexual maturity on feeding, growth and energy stores of wild Atlantic salmon parr (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Maturing Salmo salar parr had significantly lower short-term energy stores (indicated by hepato-somatic index) in August, and significantly lower energy stores and growth rate (indicated by RNA : DNA) in September than immature parr captured from the same stream sites on the same date. There were no significant differences in gut fullness or protein concentrations, suggesting that up to early September the main energetic consequences of maturation were a reduction in allocations to growth and short-term energy storage, but not a mobilization of long-term stored energy in the form of proteins. These are the first observations of relative food intake and energy storage for maturing parr under natural conditions, and also the first to assess growth effects on wild fish before completion of the maturation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb00262.x
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  • 8
    Electronic Resource
    Electronic Resource
    Adaption of the drasys code to analysis of the safety of nuclear power plants with RBMK reactors (1998)
    Springer
    Atomic energy 84 (1998), S. 1-5 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02430646
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  • 9
    Electronic Resource
    Electronic Resource
    Growth and development of Hydromedion sparsutum (Müller) (Coleoptera, Perimylopidae) from South Georgia at different temperatures (1984)
    Springer
    Polar biology 3 (1984), S. 73-76 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Adaptation of Hydromedion sparsutum (Coleoptera, Perimylopidae) to the cool, moderate climate of South Georgia Island was studied under lab conditions. Because there are no native vertebrate herbivores on the island, the Perimylopidae as primary destruents occupy an important role in the ecosystem of S. G. H. sparsutum was reared at constant temperatures of 4, 7.5, 10, 12.5 and 14°C. Constant temperatures higher than 10°C are lethal to the population, larvae do not develop to imaginal stage. Developmental speed and growth are slightly temperature compensated between 4 and 7.5°C. The Q10-value of the weekly growth rate for this range is 1.23.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258150
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  • 10
    Electronic Resource
    Electronic Resource
    Biaxial monotonic and fatigue fracture of some commercial ABS and PVC sheets (1998)
    Springer
    Journal of materials science 33 (1998), S. 4349-4356 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Biaxial loading of pre-cracked cruciform testpieces has been preformed in a novel rig attached to a uniaxial testing machine. Fracture toughness R or δc of the ductile acrylonitride butadiene styrene (ABS) and polyvinyl chloride (PVC) determined by the Cotterell–Mai method is dependent on remote biaxiality. Least toughness is shown for equibiaxial tension; greatest for uniaxial tension. These monotonic fracture results may be modelled using void growth mechanics. Fatigue crack growth rates also depend on remote biaxiality. Paris/Walker representation of the data shows that the slopes n of log (da/dN) versus log ΔK do not change much, but the constant of proportionality C decreases as the tensile mean stress increases. There may be a connection between the biaxial-dependent C and R or δc. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004428730407
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