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  • 1
    Electronic Resource
    Electronic Resource
    Exact plane-wave solutions of the coupled Maxwell–Klein–Gordon equations (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 2917-2920 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Solutions of the classical Maxwell–Klein–Gordon equations are investigated for which the Klein–Gordon field is assumed to be ψ(x)=αeipμxμ. It is shown that for this class the exponential factor can be "gauged away'' and the resulting system of equations can be reduced to a single (complicated) nonlinear equation. Furthermore, the electromagnetic four-potential field becomes massive "absorbing scalar particles.'' The steady-state (or stationary) subclass of the resulting system of equations is examined. It is proved that in absence of any magnetic field, the steady-state system does not have a solution. In the simple case for which four-potential components Aμ depend on one spatial coordinate, the equations are completely solved and explicitly analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528944
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of Tc in argon-pretreated NdSrBaCu3O6+z (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 598-599 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: NdSrBaCu3O6+z prepared in air followed by oxygen annealing showed a Tc of 68 K. The Tc of the sample when treated in argon followed by oxygen annealing increased by 10 K. This could be related to the observed shrinking of the c axis and/or a rearrangement of oxygen atoms in the basal plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357051
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  • 3
    Electronic Resource
    Electronic Resource
    2,3-Dihydro-6-hydroxy-1,3-dimethyl-7-propyl-9-(2-thienylmethyl)pyrimido[2,1-f]purine-4,8(1H,9H)-dione (1994)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 952-954 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270193011461
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  • 4
    Electronic Resource
    Electronic Resource
    Sorbinil does not prevent galactose-induced glomerular capillary basement membrane thickening in the rat (1990)
    Springer
    Diabetologia 33 (1990), S. 515-521 
    Details
    ISSN: 1432-0428
    Keywords: Basement membrane ; galactosaemia ; aldose reductase inhibitors ; glomerulus ; microvessels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We investigated the role of the polyol pathway in the pathogenesis of glomerular basement membrane thickening in galactosaemic rats, an animal model that develops basement membrane lesions comparable to those of human diabetic subjects. Normotensive Wistar-Kyoto rats fed a 30% galactose diet for nine months developed significant glomerular basement membrane thickening by comparison with rats on a control test diet (p=0.008). However, addition of an aldose reductase inhibitor, sorbinil (250 mg/kg diet), to the galactose diet did not prevent the increase in glomerular basement membrane thickness. Furthermore, by using a quantitative electron microscopic immunogold technique, we examined biochemical alterations in the composition of glomerular basement membranes in this animal model. The labelling density (comparable to relative concentration) of collagen type IV in thickened glomerular basement membranes of galactosaemic animals was significantly increased by comparison to those of control rats (p=0.015). However, there was no significant difference in labelling densities of laminin and heparan sulfate proteoglycan core protein of these animals. Thus, our results indicate that an increase in glomerular basement membrane thickness accompanied by an increase in the labelling density of collagen type IV occurs in the galactosaemic rats, but this thickening is not prevented by sorbinil at the dose used in this experiment. Our study raises the strong possibility that glomerular basement membrane thickening in galactosaemic rats may not be due to excessive polyol pathway activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404137
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of insecticides on the availability of nutrients, nitrogen fixation, and phosphate solubility in the rhizosphere soil of rice (1994)
    Springer
    Biology and fertility of soils 18 (1994), S. 37-41 
    Details
    ISSN: 1432-0789
    Keywords: Available nutrients ; Insecticides ; Microortanisms ; Nitrogen fixation ; Phosphate solubilization ; Rhizosphere soil ; Rice yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field experiment was conducted to investigate the effects of 1,2,3,4,5,6-hexachlorocyclohexane (BHC), phorate, carbofuran, and fenvalerate, at their recommended doses, on some chemical and microbiological properties of the rhizosphere soil in relation to rice yields. In general, the insecticides had a beneficial effect on rhizosphere soil properties. Carbofuran strongly stimulated the mineralization of organic C. BHC and phorate led to the retention of less total N in the soil. BHC released more NH inf4 sup+ -N than the other insecticides. Phorate, however, liberated the most NO inf3 sup- -N. Phorate and fenvalerate released more available P than BHC and carbofuran did. All the insecticides stimulated the proliferation of aerobic non-symbiotic N2-fixing and phosphate-solubilizing microorganisms, resulting in an overall increase in rice yield. BHC had the greatest effect on rice yields, followed by phorate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336442
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  • 6
    Electronic Resource
    Electronic Resource
    Absence of cytochrome c oxidase activity in a boy with dysfunction of renal tubules, brain and muscle (1994)
    Springer
    European journal of pediatrics 153 (1994), S. 267-270 
    Details
    ISSN: 1432-1076
    Keywords: Cytochrome c-oxidase ; Mitochondriopathy ; Proximal tubular acidosis ; Leigh disease ; Muscular disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report on a boy who developed proximal renal tubular acidosis with loss of carnitine at the age of about 6 months. A few months later he began to suffer from progressive muscular weakness and neurological disturbances. Blood biochemistry showed elevated lactate and β-hydroxybutyrate with increased lactate/pyruvate and β-hydroxybutyrate/acetoacetate ratios. A high urinary excretion of lactate and citric acid cycle intermediates was found. These results indicated a defect of the mitochondrial respiratory chain. Analysis of biopsy material from skeletal muscle revealed low activities of all respiratory chain complexes. In muscle and fibroblasts cytochrome c-oxidase (complex IV) was absent. Despite high dose multi-vitamin therapy the boy died at the age of 30 months from central respiratory failure. At autopsy the neuropathological diagnosis of Leigh disease was made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954517
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  • 7
    Electronic Resource
    Electronic Resource
    Absence of cytochrome c oxidase activity in a boy with dysfunction of renal tubules, brain and muscle (1994)
    Springer
    European journal of pediatrics 153 (1994), S. 267-270 
    Details
    ISSN: 1432-1076
    Keywords: Key words: Cytochrome c-oxidase – Mitochondriopathy – Proximal tubular acidosis – Leigh disease – Muscular disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We report on a boy who developed proximal renal tubular acidosis with loss of carnitine at the age of about 6 months. A few months later he began to suffer from progressive muscular weakness and neurological disturbances. Blood biochemistry showed elevated lactate and β-hydroxybutyrate with increased lactate/pyruvate and β-hydroxybutyrate/acetoacetate ratios. A high urinary excretion of lactate and citric acid cycle intermediates was found. These results indicated a defect of the mitochondrial respiratory chain. Analysis of biopsy material from skeletal muscle revealed low activities of all respiratory chain complexes. In muscle and fibroblasts cytochrome c-oxidase (complex IV) was absent. Despite high dose multivitamin therapy the boy died at the age of 30 months from central respiratory failure. At autopsy the neuropathological diagnosis of Leigh disease was made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954517
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of optimum thermal treatment on BiSrCaCu2Oy (1990)
    Springer
    Journal of materials science 25 (1990), S. 4852-4855 
    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 BiSrCaCu2O y compositions have been subjected to different atmosphere treatments and cooling schedules after initial calcination and firing in air. The large variation in properties has been explained on the basis of oxygen disorder effects and possible insertion of oxygen in different planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129952
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  • 9
    Electronic Resource
    Electronic Resource
    Doubly excited3Se,3De and3Ge states of two-electron atomic systems (1994)
    Springer
    Theoretical chemistry accounts 89 (1994), S. 147-155 
    Details
    ISSN: 1432-2234
    Keywords: Doubly excited states ; Excitation energies ; Effective quantum numbers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Time-dependent perturbation theory has been applied to calculate the doubly excited triplet statesNsns:3Se,Npnp:3De andNdnd:3Ge (N=2, 3, 4,n=N+1, ... ,5) for He, Li+, Be2+ and B3+. A time-dependent harmonic perturbation causes simulataneous excitation of both the electrons with a change of spin state. The doubly excited energy levels have been identified as the poles of an appropriately constructed linearized variational functional with respect to the driving frequency. In addition to the transition energies, effective quantum numbers of these doubly excited states have been calculated and analytic representations of their wave functions are obtained. These are utilized to estimate the Coulomb repulsion term for these states which checks the consistency of the wave functions. These wave functions may also be used for calculating other physical properties of the systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132798
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  • 10
    Electronic Resource
    Electronic Resource
    Non-symmetric extension of a crack (1994)
    Springer
    Acta mechanica 107 (1994), S. 13-19 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The dynamic in-plane problem of the non-symmetric extension of a crack in an infinite, isotropic elastic medium under normal stress is analyzed. Following Cherepanov [8], Cherepanov and Afanas'ev [9] the general solution of the problem is derived in terms of an analytic function of complex variable. The results include the expressions for the stress intensity factors at the crack tips and the rate of energy flux into the cxtending crack edges. For a particular case, numerical calculations for the stress intensity factor and the energy flux rate are carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201816
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