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  • 1
    Electronic Resource
    Electronic Resource
    Polarized electronic crystal absorption spectra of dibromo(ethylenediamine)platinum(II) (1973)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 77 (1973), S. 3077-3080 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100644a010
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  • 2
    Electronic Resource
    Electronic Resource
    Coenzyme Q. 166. Antimetabolites of coenzyme Q. 21. Synthesis of alkyl-4,7-dioxobenzothiazoles with prophylactic antimalarial activity (1973)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 16 (1973), S. 1314-1316 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00269a026
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  • 3
    Electronic Resource
    Electronic Resource
    Control system for ALID-7 linear accelerator used in radiation processing (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2984-2987 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The data acquisition and control system for the electron linear accelerator ALID-7 of 5.5 MeV and 0.7 kW, built in Romania, used on pilot-scale radiation processing, is discussed. The system provides: personnel and sensitive device protection against dangerous events; programmed interlocking and warning signals during accelerator operation; single electron pulses or electron pulse trains with small variations in pulse dose; control of electron pulse length and repetition rate, electron beam intensity, magnetron frequency, high voltage level on magnetron and electron-gun modulators, sweeping amplitude and frequency, conveyor velocity, irradiation time, and electron pulses number; simultaneous electron beam and microwave treatment. An important feature of the installation is an original control technique for obtaining programmed beam single shots and pulse trains with programmed pulse number, pulse repetition frequency, and pulse duration, from a diode gun linear accelerator, by discrete pulse temporal position modulation of the gun electron pulses and the magnetron microwave pulses. It is particularly useful for automatic control of absorbed dose rate level, irradiation process control as well as in pulse radiolysis studies, single pulse dose measurement or for research experiments where pulse-to-pulse reproducibility is required. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149858
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  • 4
    Electronic Resource
    Electronic Resource
    Present status of the 2.45 GHz ECRIS for a light ion accelerator at IAP : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1183-1185 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article presents a 2.45 GHz electron cyclotron resonance ion source which is under construction at the Institute of Atomic Physics Bucharest, Romania. It will be used as an injector into an existing linac for light ions and is a compact version of a similar source, for which we have obtained the magnetic system by superimposing an axial magnetic field generated by two solenoids and a radial magnetic field generated by a permanent magnet hexapole. For the compact version we have employed two rings made of permanent magnets for the axial magnetic field and the same type of hexapole for the radial field. This second version will work on a high voltage platform. The calculation, design, and construction of the two minimum magnetic field structures (B minimum) are presented. These sources have a special microwave antenna, of a helix type, allowing a much smaller diameter plasma chamber than is usually used for the employed microwaves. The microwave system is also presented. The first experiments were made with an Ar plasma. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146726
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  • 5
    Electronic Resource
    Electronic Resource
    Introduction (1995)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 102 (1995), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1995.tb09156.x
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  • 6
    Electronic Resource
    Electronic Resource
    Capacitance-voltage profiling of quantum well structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7005-7013 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Capacitance-voltage (C-V) analysis of high quality MBE grown quantum well samples shows that carrier distributions are averaged over the scale of the Debye length. This averaging process results in strongly temperature dependent C-V-deduced doping distributions that can be very different from the actual ones. The doping distribution of the structure is obtained by fitting numerically simulated curves to the measured C-V curves and doping profiles, respectively. Although the calculations do not take quantum size effects into account they show good agreement with the measured data. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361466
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  • 7
    Electronic Resource
    Electronic Resource
    Optical measurements of electronic bandstructure in AlGaInP alloys grown by gas source molecular beam epitaxy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3412-3415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of bulk (AlyGa1−y)0.52In0.48P epilayers, covering the full range of compositions from y=0 to y=1, have been grown lattice matched on GaAs substrates by gas source molecular beam epitaxy. Double crystal x-ray diffraction, and low temperature photoluminescence (PL) and photoluminescence excitation (PLE) optical spectroscopy have been used to characterize the structures. PL and PLE data indicate the direct-to-indirect energy gap crossover composition to be near y∼0.55 for this alloy system. From PLE, the y dependence of the (5 K) lowest energy direct gap, EΓ–Γ, has been found to be 2.014+0.499y+0.16y2 eV. EΓ–Γ (5 K) for the indirect-gap ternary end-member Al0.52In0.48P is directly determined to be 2.685 eV. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358631
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  • 8
    Electronic Resource
    Electronic Resource
    Models for the study of macrocyclic ring-chain tautomerism (1970)
    s.l. : American Chemical Society
    The @journal of organic chemistry 35 (1970), S. 1200-1203 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00829a085
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  • 9
    Electronic Resource
    Electronic Resource
    SODIUM-DEPENDENT EFFLUX AND EXCHANGE OF GABA IN SYNAPTOSOMES (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 23 (1974), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The influx and efflux of [3H]GABA were investigated in synaptosomes. Two efflux components were detected. The first, termed spontaneous efflux, was not affected by the external sodium chloride concentration. The second, termed GABA-stimulated efflux, was observed when low levels of GABA were added to the incubation medium and was found to require external sodium chloride. The rate of spontaneous efflux at 0°C was about 37 per cent of the rate at 27°C but both GABA-stimulated efflux and GABA influx were completely inhibited at 0°C. The stimulation of efflux by external GABA followed simple Michaelis–Menten kinetics with respect to external GABA. The concentration of external GABA required for half-maximal stimulation was 4·9 ± 1·4 μm and the Vmax for efflux was 1·0 ± 0·6 nmol. min-1.mg-1 of protein. A similar stimulation of efflux was observed with GABA analogue l-2,4-diamino-butyric acid which is a competitive inhibitor of influx. The concentration of external l-2,4-diaminobutyric acid required for half-maximal stimulation of efflux was 51 ± 12 μm and the Vmax for efflux was 0·8 ± 0·5 nmol.min-1.mg-1 of protein. Since the sodium-dependency, temperature sensitivity, and kinetic properties of the GABA-stimulated efflux system were similar to the influx system, GABA-stimulated efflux was attributed to carrier-mediated exchange diffusion. Measurement of efflux and influx in the same preparation showed there was a net efflux when total fluxes were considered and that the exchange ratio (influx to GABA-stimulated efflux) was 0·9 when carrier-mediated fluxes were considered. The effect of the temperature of the fluid used to rinse synaptosomes collected on filters in influx experiments was investigated. There was no detectable difference in measured values of influx between samples rinsed with cold fluid (0°C) and warm fluid (27°C). The endogenous GABA content of synaptosomes was found to be 20·3 ± 2·5 nmol GABA per mg of protein. From this value, the cytoplasmic concentration of GABA in synaptosomes was estimated to be a maximum of 40 mm. About 5 per cent of total cerebral cortical GABA was found in the synaptosomal fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1974.tb10750.x
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  • 10
    Electronic Resource
    Electronic Resource
    KINETICS OF THE SODIUM-DEPENDENT TRANSPORT OF GAMMA-AMINOBUTYRIC ACID BY SYNAPTOSOMES (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 21 (1973), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The kinetics of transport of gamma-aminobutyric acid [2,3-3H] by synaptosomes from rat brain was studied by means of a rapid filtration technique. The rate of uptake was proportional to the protein concentration over the range 0.05—0.2 mg of synaptosomal protein per ml. Although apparent allosteric kinetics were observed with sodium, transport followed simple saturation kinetics with respect to GABA and no heterotropic, cooperative effects of GABA on sodium on kinetics were observed. A minimum of three interacting sodium sites is suggested the basis of Hill plots of the sodium data. Both the apparent Km and Vmax for GABA were functions of the sodium ion concentration but the effect of sodium was considerably greater on Vmax than on the apparent Km The Vmax for GABA was 1.1 ± 0.5 nmol.min−1 mg−1 of protein at 95 mm sodium and decreased to 12 per Cent of this value at 19 mm sodium. The apparent Km for GABA increased from 4.0 ± 1.0 μm at 95 mm sodium to 8.4 ± 2.0 μm at 19 mm sodium. Potassium was a noncompetitive inhibitor with respect to GABA and did not affect the apparent cooperativity observed with sodium. These findings are discussed in terms of models of GABA transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1973.tb04255.x
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