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  • 1
    Electronic Resource
    Electronic Resource
    Indented barrier resonant tunneling rectifiers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4174-4176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article concerns a novel negative-conductance device consisting of a series of N laterally indented barriers which exhibits resonant tunneling under one bias polarity and simple tunneling under the opposite one, thus acting as a rectifier. Electrons undergo resonant tunneling when the bias creates a band profile with N triangular wells which can each contain a resonant state. From 1 to N the addition of each indentation can be used to increase the current density and the rectification ratio, calculated at the current-peak bias at resonance, provided that at a given bias all the states in the triangular wells align each other with the emitter Fermi energy in order to form a resonance along the structure. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363290
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  • 2
    Electronic Resource
    Electronic Resource
    Rheology of Cetyltrimethylammonium Tosylate-Water System. 1. Relation to Phase Behavior (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 3337-3346 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00009a013
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of resonant tunneling paths in current–voltage characteristics line shapes (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2675-2677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We analyze the current density-voltage characteristics of double-barrier tunneling diodes, with different spacer layers, within the framework of a Poisson solver together with a coherent tunneling approximation for transmission probabilities. We show that varying the spacer layer thickness, together with barrier heights, changes dramatically the current density-voltage characteristics line shape, which is revealed to be an important qualitative signature of the tunneling paths involved in the double-barrier diodes under operation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114289
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  • 4
    Electronic Resource
    Electronic Resource
    Optical probing of interface roughness in resonant tunneling structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 810-812 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on photoluminescence (PL) and photoluminescence-excitation measurements in GaAs/In0.1Ga0.9As/AlAs double-barrier tunneling structures as a function of bias voltage and temperature. We have observed a splitting in the quantum well photoluminescence due to island formation in the quantum well. We have a good correlation between the variation of integrated PL intensity, linewidth, and tunnel current bias for both lines. The temperature dependence of photoluminescence spectra shows that transfer of carrier between islands can be tuned by the applied bias and that states in different islands are populated by electrons in the resonant tunneling process. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365776
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  • 5
    Electronic Resource
    Electronic Resource
    Parallel nocturnal secretion of melatonin and testosterone in the plasma of normal men (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 19 (1995), S. 0 
    Details
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Differences and similarities in the temporal organization of hormone secretion in plasma reflect the activity of CNS pacemakers. One aspect of this activity, the temporal synchronization of the secretion of different hormones is still poorly understood. We report the analysis of melatonin and testosterone plasma concentrations during two nights in 6 normal healthy young men. Blood was collected every 20 min between 2040 and 0640. Plasma testosterone concentrations increased by 1.5- to 2-fold during the second part of the night, and melatonin by 2.5- to 4-fold. In each subject, the individual temporal pattern of melatonin was quite stable over the two nights of sampling, while testosterone profiles showed fluctuations. There was a high degree of parallelism in these two hormones nocturnal secretion. These results, together with previous studies, suggest that melatonin might entrain the nocturnal secretion of testosterone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-079X.1995.tb00166.x
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  • 6
    Electronic Resource
    Electronic Resource
    Brain Metabolism of Progesterone, Coping Behaviour and Emotional Reactivity in Male Rats from Two Psychogenetically Selected Lines (1997)
    Oxford, UK : Blackwell Science Ltd
    Journal of neuroendocrinology 9 (1997), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Brain metabolites of progesterone such as tetrahydroprogesterone (THP) act on GABAA receptors and have anxiolytic properties. The formation of THP and its 5α-reduced precursor, dihydroprogestrone (DHP) was measured in vitro in various microdissected brain areas obtained from males of two psychogenetically selected rat lines, i.e. the Roman High-(RHA/Verh) and Low-(RLA/Verh) Avoidance rats, which are known to differ in emotional reactivity and/or anxiety. The behavioural and neuroendocrine responses of these rats were also measured following exposure to a novel environment in two different test situations. The formation of DHP and THP was found to be significantly higher in the frontal cortex (FCX), and DHP in the bed nucleus of the stria terminalis (BST), of the hypoemotional RHA/Verh rats. In addition, enzymatic activity in the FCX was found to be inversely correlated with behavioural measures of anxiety. These results suggest that individual, possibly genetically-determined differences in brain production of endogenous anxiolytics derived from progesterone may account at least in part for the behavioural differences characterizing these two lines, and provide further evidence that neurosteroids acting on the GABAergic system may play an important role in modulating physiological and/or behavioural responses to environmental stressors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2826.1997.t01-1-00571.x
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of low doses of heparin on the plasma binding of phenytoin and prazosin in normal man (1983)
    Springer
    European journal of clinical pharmacology 25 (1983), S. 211-214 
    Details
    ISSN: 1432-1041
    Keywords: heparin ; protein binding ; phenytoin ; prazosin ; lipases ; plasma triglycerides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of low doses of heparin on the binding of phenytoin and prazosin to plasma proteins was evaluated in four normal subjects. Heparin activates the hydrolysis of triglycerides in plasma. The ensuing increase in non-esterified fatty acids (NEFA) was more marked in vitro than in vivo and increased the free fraction (FF) of phenytoin and prazosin in plasma. The higher FF caused a change in the plasma to whole blood ratio (P/B ratio) of both drugs. The changes in FF and P/B ratio after heparin were small, but could be of significance in pharmacokinetic studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543793
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of NaOH and NaCl on the disodiumn-decane phosphonate micellar aggregation number (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 288-292 
    Details
    ISSN: 1435-1536
    Keywords: Disodiumn-decane phosphonate ; rodlike micelles ; diffusion coefficients ; polarography ; micelle size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The diffusion coefficient of disodiumn-decane phosphonate micelles was studied by polarography at 25°C in NaCl and in NaOH solutions, and the size and aggregation number of the micelles was computed as a function of Na+ concentration. All other conditions being equal, the addition of NaCl produces micelles with an aggregation number one order of magnitude larger than the NaOH addition. This is due to the increase of the effective charge per micellized head group produced by the reaction of OH- with the hydrolized head groups which are mainly present as-PO3H- in the micellar Stern layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657836
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  • 9
    Electronic Resource
    Electronic Resource
    Evaporation rate from aerosol OT-water-n-heptane inverse micellar systems (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 439-443 
    Details
    ISSN: 1435-1536
    Keywords: Surfactants ; evaporation ; inverse micelles ; microemulsions ; aerosol OT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The evaporation rate of aerosol OT-water-n-heptane inverse micellar systems was studied. The evaporation behavior of solutions was strongly affected when compared with pure heptane. The changes are related to the structure of the micelles and the properties of the water molecules dissolved in the micelles. The initial rate of evaporation reaches a maximum when the surfactant head groups are hydrated with three water molecules, a minimum when the first hydration shell of Na+ ions is completed, and then rises and stabilizes until the second hydration shell is completed. The presence of free water when the ratio water molecules to surfactant molecules exceeds 12 produces a new rise of the initial evaporation rate, which is always higher than that of puren-heptane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656888
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  • 10
    Electronic Resource
    Electronic Resource
    Counterion specificity of the micelle surface and its implications on micellar catalysis (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 662-668 
    Details
    ISSN: 1435-1536
    Keywords: Micellar catalysis ; critical micelle concentration ; micellization ; counterion distribution constants ; hydroxide surfactants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dodecyltrimethylammonium bromide — Dodecyltrimethyl-ammonium hydroxide — water mixtures were studied with ion-selective electrodes, and the aggregation behavior, degree of ionization of the micelles and the distribution constants of bromide and hydroxide ions between water and micelles were found, showing that some suppositions about the interpretation of micellar catalysis are incorrect, and these interpretations must be revised. The results support the mass action model for the theoretical treatment of micellar catalysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653065
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