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  • 1
    Electronic Resource
    Electronic Resource
    Molecular orbital approach to substituent effects in amine-CO2 interactions (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 6947-6954 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00229a003
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  • 2
    Electronic Resource
    Electronic Resource
    Inverse relationship between melanogenesis and endogenous hydroquinone (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 829-830 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Inhibition or stimulation of melanogenesis have been found to occur as a result of the alteration of hydroquinone levels in the body. Substances which stimulate melanogenesis are found to lower the level of hydroquinone in amphibia, and evidence for the relationship is also given by mammalian experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01951975
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  • 3
    Electronic Resource
    Electronic Resource
    Ion–ion correlations in quenched disordered media (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 7700-7712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monte Carlo simulation based on Widom's test particle method is used to study the behavior of dilute ionic solutes in a quenched disordered medium with ionized obstacles. The structure of the medium is assumed to correspond to that of an ionic fluid equilibrated at certain prequenching temperature Tq and permittivity εq different from the corresponding values at the conditions of observation. The correlations among solute ions display qualitative differences from those observed in annealed systems. The ions of equal sign are attracted to domains of the disordered material characterized by charge opposite to that of the ions. The attraction of ions of the same sign to the same domains results in an apparent attractive contribution to the disorder-averaged interionic potential. At distances sufficiently exceeding the screening length pertaining to the ionized obstacles at the prequenching conditions, the disorder-induced term prevails over the direct Coulombic repulsion and a net attraction is observed. A similar mechanism leads to a long-ranged repulsion between oppositely charged ions. These findings are in agreement with earlier calculations of the disorder-averaged ion–ion potentials based on the asymptotic Debye–Hückel description of the disordered medium. The simulations are also used to estimate the effects of the medium on thermodynamic properties of the embedded ionic solute. The energies and activity coefficients are found to decrease with the product of the prequenching temperature and permittivity, a phenomenon explained in terms of the increase of the potential fluctuations in the disordered medium with growing εqTq. In spite of its global electroneutrality, the quenched medium displays a strong selectivity with respect to the valency of the solute, the tendency towards absorption increasing with the charge of the ions. The selectivity rapidly increases with increasing value of the characteristic product of the prequenching temperature and the permittivity εqTq. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471476
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  • 4
    Electronic Resource
    Electronic Resource
    The structure of a random heteropolymer in a disordered medium: Ensemble growth simulation (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 1264-1279 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We use Monte Carlo simulations to study the thermodynamics and structural behavior of random heteropolymers immersed in a disordered medium. Simulation results pertain to isolated heteropolymer chains with renormalized intrachain interactions determined by analytic averaging over the realizations of the external medium. Two situations are considered. In the first scenario, the random heteropolymer is such that segments of different type have a propensity to segregate, while in the second situation different types of segments prefer to be adjacent to each other. Polymer configurations are generated by the ensemble-growth Monte Carlo method wherein the slow-down effects that typically hinder dynamic Monte Carlo simulations of compact polymer states with strong interactions are alleviated. Our simulations show that for the case where the bare heteropolymer prefers to form segregated patterns, below a certain temperature, the random heteropolymer "folds" into a few dominant conformations with a segregated pattern of contacts. In the case where the bare heteropolymer favors mixing of different types of segments we find richer behavior. Here, our simulations show the existence of two frozen phases separated by a reentrant phase as temperature (or strength of the external disorder) is scanned. The heteropolymers in the two frozen phases are "folded" in different patterns (high T, mixed pattern; low T, segregated pattern). The physical reasons for these phenomena are elucidated based on our simulation results for structural features of the polymer. The results agree remarkably well with a simple mean-field theory, a fact that may be of some general consequence. Specific experiments are suggested to test the phenomena that we predict. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473223
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of silicate ratio on the distribution of silicate and aluminosilicate anions in TPA aluminosilicate solutions (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 4501-4506 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100164a060
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  • 6
    Electronic Resource
    Electronic Resource
    An accelerator for alkali metal plasmas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1594-1602 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A washer plasma gun for alkali-metal plasma is developed. This gun is suitable as a source for experiments on alkali-metal plasmas, plasma diagnostics, and in various applications such as ion-beam sputter deposition. The gun uses an injector of alkali-metal vapor based on the principles of laser ablation. Acceleration is performed by a large electrical field provided across eight washers. The gun is compact, stable, and easy to fabricate and use. The gun produces a neutral Li0 beam current of 1 A/cm2 and a Li+ ion current of 50 A/cm2 at its exit at 10 kV of capacitor bank voltage. With this intensity, it is possible to produce beams of neutral Li0 atoms of density 6×109 cm−3 and Li+ ions of density ∼1011 cm−3 at 1 m from the gun, moving with a velocity of ∼107 cm/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144898
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of substituting mercury for yttrium, barium and copper on the superconducting transition temperature of YBa2Cu3Oδ (1994)
    Springer
    Journal of materials science 5 (1994), S. 22-24 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Several superconducting oxide samples such as YBa2Cu3Oδ (denoted AO), Y1−xHgxBa2Cu3Oδ (x=0.5–0.8, Al), YBa2−xHgxCu3Oδ (x=0.3–1.5, A2) and YBa2Cu3−xHgxOδ (x=0.5, A3) were prepared by mixing Y203, BaCO3, copper acetate (instead of CuO) and HgO. The superconducting transition temperatures,T c, in all the mercury-doped samples were found to be more than 90 K, with the highestT c = 100 K observed in A2. Results of electrical, magnetic and structural studies of some of these superconducting samples have been reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00717878
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  • 8
    Electronic Resource
    Electronic Resource
    A study of solar radio emission in the light of Sengupta's model of coronal active regions (1973)
    Springer
    Solar physics 30 (1973), S. 395-401 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Daily solar radio flux at six different frequencies in dm, cm and mm wavelength regions has been studied for 182 days from December 1, 1970 to May 30, 1971. It is found that the slowly varying component of the centimeter wave emission correlates well with the physical model of the coronal active regions derived by Sengupta (Sengupta, 1971b) from which, as he showed earlier, most of the solar soft X-rays of wavelength less than 20 Å comes. It is also found that the cm wave emission is consistent with the assumption that the emitting regions are optically thin in this wavelength range. Emissions in dm and mm wavelength ranges, however, show poor correlation with the physical model of the soft X-ray emitting regions. It is concluded that the preferred regions of cm wave emission are located in the same region of solar corona from where most of the soft X-rays comes, but are different from the preferred regions of mm and dm emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152671
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of tryptophan on tyrosinase in relation to vitiligo (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 920-921 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tryptophan can inhibit DOPA (3,4-dihydroxy phenylalanine) conversion to melanin both by the enzymatic and the nonenzymatic route. Its role has been studied in relation to vitiligo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953793
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  • 10
    Electronic Resource
    Electronic Resource
    Trace metals and melanogenesis (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 282-283 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Emission spectroscopic analysis of amphibian and mammalian skin ash for the study of trace metals shows that nickel, lead and tin may play some role in the pigmentation-depigmentation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955305
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