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  • 1995-1999  (10)
  • 1980-1984
  • 1965-1969
  • 1997  (10)
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  • 1995-1999  (10)
  • 1980-1984
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the local magnetic moments at X sites in XFe2 compounds: Pressure effects (X=Y, Lu, Zr, Hf) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3880-3882 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Adopting a simple model to describe the intermetallic cubic Laves phase compounds XFe2 (X=Y, Lu, Zr, Hf) we discuss the effect of an external applied pressure on the local magnetic moments at both sublattices. We assume that pressure acts on the system, modifying the widths of the sublattice bands and the spin-dependent hybridization between d states of the two sublattices. Using realistic densities of states we obtain, in a self-consistent way, the local d-magnetic moments at X and Fe sites which turn out to be antiparallel. As pressure increases one shows that the magnitude of the local magnetic moment at the X site increases until saturating, whereas the local magnetic moment at the Fe site decreases until saturating. Similarly to the experimental data, which show that the hyperfine field at the X site increases with applied pressure, our theoretical model predicts that the magnetic moment at the X site also increases with pressure. The calculated hyperfine and magnetic moments at the Fe site are also consistent with available experimental data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365054
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  • 2
    Electronic Resource
    Electronic Resource
    Local magnetization and hyperfine field systematics of s−p and noble impurities in Gd and Ni hosts : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4215-4217 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic hyperfine data of s−p and noble impurities diluted in ferromagnetic Gd and Ni hosts are described within a simple model which is an extension on that one of Daniel and Friedel. We also include in the present model the effect of next-neighbor perturbation, due to the translational invariance break introduced by the impurity. Performing a self-consistent calculation of the local magnetic moments at the impurity site, one obtains the conduction electron polarization (CEP) hyperfine field. It is found that the model can explain the different hyperfine field trends observed in Gd and Ni hosts, e.g., a remaining negative value along the s−p series in the Gd case and a change of sign behavior in the Ni case. Period effects observed in noble impurities are also discussed and the theoretical calculations are in good agreement with available experimental data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365124
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulations of elementary chemical processes in liquid water using combined density functional and molecular mechanics potentials. II. Charge separation processes (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 3643-3657 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new approach to carry out molecular dynamics simulations of chemical reactions in solution using combined density functional theory/molecular mechanics potentials is presented. We focus our attention on the analysis of reactive trajectories, dynamic solvent effects and transmission coefficient rather than on the evaluation of free energy which is another important topic that will be examined elsewhere. In a previous paper we have described the generalities of this hybrid molecular dynamics method and it has been employed to investigate low energy barrier proton transfer process in water. The study of processes with activation energies larger than a few kT requires the use of specific techniques adapted to "rare events" simulations. We describe here a method that consists in the simulation of short trajectories starting from an equilibrated transition state in solution, the structure of which has been approximately established. This calculation is particularly efficient when carried out with parallel computers since the study of a reactive process is decomposed in a set of short time trajectories that are completely independent. The procedure is close to that used by other authors in the context of classical molecular dynamics but present the advantage of describing the chemical system with rigorous quantum mechanical calculations. It is illustrated through the study of the first reaction step in electrophilic bromination of ethylene in water. This elementary process is representative of many charge separation reactions for which static and dynamic solvent effects play a fundamental role. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473458
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  • 4
    Electronic Resource
    Electronic Resource
    A Lupinus albus root glycoprotein homologous to the polygalacturonase inhibitor proteins (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 99 (1997), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A glycoprotein with an apparent molecular mass of 42 kDa (GP42), detected in the roots of Lupinus albus L. (cv. Rio Maior), was found to increase along the root axis with increasing distance from the apex and to be induced in roots cultured in vitro upon exogenous supply of high IAA (10-3M). GP42 is ionically bound to the cell wall, it has a pl〉8.3, and it is N-glycosylated. The purification of GP42 was accomplished by affinity chromatography (ConA-Sepharose) followed by cation-exchange chromatography (Mono S). The amino acid sequence of the amino terminal part of the protein shows 70% identity to that of polygalacturonase inhibitor proteins (PGIPs) from other species. GP42 inhibits the polygalacturonase activity from Aspergilltus niger in vitro suggesting that it is a PGIP. The possible relationship between the L. albus PGIP and root development is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1997.tb05411.x
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  • 5
    Electronic Resource
    Electronic Resource
    K + channel regulation of signal propagation in dendrites of hippocampal pyramidal neurons (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 387 (1997), S. 869-875 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pyramidal neurons receive tens of thousands of synaptic inputs on their dendrites. The dendrites dynamically alter the strengths of these synapses and coordinate them to produce an output in ways that are not well understood. Surprisingly, there turns out to be a very high density of transient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/387869a0
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  • 6
    Electronic Resource
    Electronic Resource
    Correction K + channel regulation of signal propagation in dendrites of hippocampal pyramidal neurons (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 199-199 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 387, 860–875 (1997) On page 875 of this Article, there are some typographical errors in the equations used in the computer model. The errors are in the third and fourth full paragraphs on this page. The first sentence of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/36632
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  • 7
    Electronic Resource
    Electronic Resource
    Chemotherapeutic treatments: A study of the interplay among drug resistance, toxicity and recuperation from side effects (1997)
    Springer
    Bulletin of mathematical biology 59 (1997), S. 205-232 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A system of differential equations for the control of tumor growth cells in a cycle nonspecific chemotherapy is analyzed. Spontaneously acquired drug resistance is taken into account, and a criterion for the selection of chemotherapeutic treatment is used. This criterion purports to describe the possibility of improvement of the patient's health when treatment is discontinued. Contrary to our early results which also take drug resistance into account, in this context strategies of continuous chemotherapy in which rest periods take part may be better than maximum drug concentration throughout the treatment (which appears to be in accordance with clinical practice). This bears out our previous conjecture that when drug resistance is accounted for, the imperfections in the usual modelling of treatment criteria, which in general do not allow for patient recuperation, ruled out the possibility of rest periods in optimal continuous chemotherapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462001
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  • 8
    Electronic Resource
    Electronic Resource
    Conflicting objectives in chemotherapy with drug resistance (1997)
    Springer
    Bulletin of mathematical biology 59 (1997), S. 707-724 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A system of differential equations for the control of tumor cells growth in a cycle nonspecific chemotherapy is presented. Spontaneously acquired drug resistance is accounted for, as well as the evolution in time of normal cells. In addition, optimization of conflicting objectives forms the aim of the chemotherapeutic treatment. For general cell growth, some results are given, whereas for the special case of Malthusian (exponential) growth of tumor cells and rather general growth rate for normal cells, the optimal strategy is worked out. The latter, from the clinical standpoint, corresponds to maximum drug concentration throughout the treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458426
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  • 9
    Electronic Resource
    Electronic Resource
    Incompressible fluid flow and heat transfer through a nonsaturated porous medium (1997)
    Springer
    Computational mechanics 20 (1997), S. 479-494 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This work studies a nonsaturated flow and the heat transfer associated phenomenon of a newtonian fluid through a rigid porous matrix, using a mixture theory approach in its modelling. The mixture consists of three overlapping continuous constituents: a solid (porous medium), a liquid and an inert gas, included to account for the compressibility of the system as a whole. A set of four nonlinear partial differential equations describe the problem whose hydrodynamical part is approximated by means of a Glimm's scheme combined with an operator splitting technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050269
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  • 10
    Electronic Resource
    Electronic Resource
    Mineralization in serially passaged human alveolar bone cells (1997)
    Springer
    Journal of materials science 8 (1997), S. 61-65 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Well-characterized human bone cell cultures have been regarded as auseful tool to study bone control mechanisms and also to analysebone/biomaterials interactions. In the present study, human alveolar bone cellswere cultured in α-minimal essential medium (α-MEM) containing 10%foetal bovine serum (FBS), 50 μg/ml ascorbic acid, 10 mM sodiumβ-glycerophosphate and either in the presence or in the absence of 10 nMdexamethasone (Dexa). Cultures were characterized concerning cellviability/proliferation, alkaline phosphatase (ALP), acid phosphatase (ACP) andtartraric acid resistant phosphatase (TRAP) activities, and formation ofmineralized areas. Cell proliferation increased gradually for approximately 20days. In the presence of Dexa, cells formed isolated or interconnectedmultilayered clusters that increased with culture time. Histochemical assaysrevealed strong positive reactions for ALP and calcium and phosphates deposits,mainly in relation t!o cells associated with the clusters. High levels of ALP activity (biochemicaldetermination) were observed. Cells cultured in the absence of Dexa showedsignificantly lower ALP activity and no calcium and phosphates deposits werepresent. Serially passaged cells kept the proliferation rate constant but adecrease in ALP activity was observed either in the presence or in the absenceof Dexa. The ability to form mineralized areas (cultures fed with Dexa) alsodecreased on serial subculture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018598430983
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