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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2221-2226 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Equilibrium free energies for the α and ω phases of Ti are constructed. The result is a consistent picture of the ambient pressure, static high pressure, and shock data, as well as first-principles electronic structure calculations. The Hugoniot consists of three segments: a metastable α-phase region, a transition region, and an ω-phase branch. All the Hugoniot data are consistent with a transition occurring at ∼12 GPa. An early identification [R. G. McQueen et al., in High Velocity Impact Phenomena, edited by R. Kinslow (Academic, New York, 1970)] of a phase transition at 17.5 GPa appears to have been an artifact. The shock Hugoniot extends further into the metastable region than static data, indicating the existence of a relaxation process occurring on a time scale intermediate between those of the static and dynamic measurements. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 32 (1979), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— A highly active subcellular protein synthesising system is described, in which uncomplexed ribosomes isolated from 5 to 7 day old mouse brain can be reprogrammed with polyuridylic acid. Either purified free polyribosomes or microsomes were used as the starting material for the preparation of uncomplexed ribosomes by treatment with 0.5m-KCl and puromycin. After reduction of the salt concentration 80S ribosomes were isolated by washing through sucrose. When, subsequently, zonal centrifugation in equivolumetric sucrose gradients containing 0.5 m-KCI was performed, purified ribosomal subunits were obtained. Cross-contamination of subunits was less than 5%. Re-associated ribosomes and recombined isolated ribosomal subunits both showed high activities in vitro. Incorporation levels of 50–60 phenylalanine residues per ribosome could be reached, at a rate of 0.5–2.0 residues/min/ribosome, depending on the activity of the high speed supernatant enzymes added. It was shown by paper chromatography of the cell-free product that only oligophenylalanine formation takes place. It was estimated that 6&70% of the ribosomes present in vitro were actively participating in the protein synthesis process.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 1973-1978 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The diffusion Monte Carlo method is applied in conjunction with an ab initio effective core potential to compute energies of some neutral and charged states of Al and Al2. The computed ionization potentials, electron affinities and dissociation energies differ from measured values by at most a few hundredths of eV. The computed dissociation energy of Al2 agrees with the most extensive CI calculations. It appears that our dissociation energy for Al−2 is the most accurate to date. The quality of the results indicates that the use of the pseudopotential is not an important limitation on the accuracy of these calculations. Variational wavefunctions with Boys-Handy correlation functions are found to give more than 70% of the correlation energy with 8 optimized parameters. These optimized trial functions are used together with numerical integration to localize the pseudopotential. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dialectica 5 (1951), S. 0 
    ISSN: 1746-8361
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Philosophy
    Notes: Starting with an analysis of the respiratory function and of the way it automatically connects the living organism with the physical milieu without any conscious or voluntary effort, Dr De Greeff then asserts that, on the Psychological level, similar basic mechanisms connect the individual with the social environment, and more generally with the Cosmos.Typical disorders of these mechanisms are to be seen in melancholic depressions and in the feelings of strangeness and loneliness they bring about. These mechanisms have à neural basis in the diencephalic region and may be influenced by shock therapies. On the other hand, cerebral surgery shows that the frontal lobe intervenes to adjust these connecting mechanisms to the external world in its concrete structure, present and future.The author then criticizes the freudian conception, as he understands it, and proposes to substitute to the Instinct-Reality dichotomy the antagonism of two internal attitudes, which are basic, automatic, and nearly organic, in the sense defined above: the sympathy-attitude, which results in valorisation of and subordination to the object, and the defence-attitude, which manifests itself in aggression and aims at annihilating the object. These attitudes are complementary and any awakening of one of them supposes the inhibition of the other one. But such an inhibition never reaches the stage of an absolute suppression.So much for the instinctive, unconscious and diencephalic basis of action. What kind of new developments do the cerebral cortex and the higher mental functions bring about? They make the individual aware of his basic attitudes, or, more exactly, of the way the object is affected by them so as to appear pleasant or unpleasant, lovable or threatening. They give him the possibility of accepting or refusing the first movements of instinct, and of stabilizing, delaying or inhibiting the corresponding reactions. They are the basis of temporal dimension and integration, of choice, liberty and morality.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 32 (1994), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The salinity in the Breede River in the Robertson area (S. W. Cape, South Africa) has increased at an alarming rate over the past two decades. Water analyses have shown that a few tributary streams which drain Bokkeveld Shale catchments are responsible for the high salinity in this agriculturally important river. Research carried out to investigate the sources of salinity in one such catchment, the Poesjesnels River Valley, found that heavy salt loads were contributed by return flow seepages after irrigation of deeply ripped, thin soils which overlie decomposed shale. A smaller contribution was coming from ground water which had leached out some salt from these shales while moving through bedrock fractures under pressure from the head in the encircling mountains, and eventually seeped into the river; evidence for this was provided by comparison of the oxygen isotope ratios of the various water bodies in the valley with that of the river water. A salt balance model drawn up to differentiate between the sources of salinity gave an indication of the systems which need management in future hydrological and agricultural development in this and similar valleys.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 6412-6417 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Variational and diffusion Monte Carlo calculations are carried out on the molecules SiHn (n=1–4), Si2, Si2H6, and Si3H8. The anion SiH3− is also considered. Core electrons are eliminated through the use of an ab initio effective core potential. The atomization energies and various bond energies are compared with experiment and other calculations. The atomization energies of SiH–SiH4 are in good agreement with experiment and with the best other calculations. The calculated electron affinity of SiH3 is within 0.02 eV of the measured value. The calculated atomization energies of the silanes SiH4, Si2H6, and Si3H8 are more consistent with the original heats of formation of Gunn and Green [J. Phys. Chem. 65, 779 (1961); 68, 946 (1964)], without the subsequent corrections [M. W. Chase, Jr., C. A. Davies, J. R. Downey, Jr., D. J. Frurip, R. A. McDonald, and A. N. Syverud, J. Phys. Chem. Ref. Data 14, Suppl. 1 (1985)] made on the assumption that the final state of Si is amorphous. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1607-1612 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We describe the development of an ab initio Hartree–Fock (HF) pseudopotential for C that has neither repulsive r−2 nor attractive Coulomb singularities at the nucleus. This potential is tested in HF calculations on small hydrocarbons and shown to give good accuracy in comparison to all-electron calculations. The new pseudopotential is demonstrated to give superior basis set convergence in HF calculations compared to standard ones with r−2 singularities. Diffusion Monte Carlo (DMC) calculations on C and CH with the new potential show substantial improvements in stability at larger time steps compared with conventional pseudopotentials, with negligible time step dependence of the total energy. The resultant CH bond energy, De=83.3(4) kcal/mol, is in good agreement with experiment and with a similar all-electron DMC calculation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 34 (2003), S. 0 
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The current slow growth rate of black bream (Acanthopagrus butcheri Munro) impedes their widespread commercial aquaculture across inland southern Australia. We report initial estimates of genetic variation for growth traits at 90 days of age from a diallel cross using two black bream populations. Standard length, total length, and wet weight varied significantly among lines and among half-sib groups within lines. Differences among half-sib groups explained 6.8% of the total variance in standard length, 8.3% in total length, and 7.1% in wet weight, giving estimated heritabilities over all lines of 0.27±0.11 for standard length, 0.33±0.13 for total length, and 0.28±0.12 for wet weight. There was no evidence for heterosis in any traits when straight-bred and crossbred lines were compared. There were high phenotypic (rP=0.95–0.98) and genetic (rG=0.63–0.69) correlations among all growth traits.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 646 (1981), S. 348-352 
    ISSN: 0005-2736
    Keywords: (Skeletal muscle, Atria) ; Ca^2^+ uptake ; Na^+ effect ; Na^+/Ca^2^+ exchange
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 339-341 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Change in the force of contraction in papillary muscle (a) and atria (b). ED50 values (???? l1±s.e.m.) were calculated by fitting the logit function to the experimental data using the least-square method: papillary muscle, guinea pig (D) 110.3± 1.9, cat(*) 124.1±2.6; ...
    Type of Medium: Electronic Resource
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