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  • 1
    Electronic Resource
    Electronic Resource
    Separation of Orthophosphates from Organic Phosphates (1955)
    s.l. : American Chemical Society
    Analytical chemistry 27 (1955), S. 1506-1506 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60105a051
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  • 2
    Electronic Resource
    Electronic Resource
    SPECTROPHOTOMETRIC EVIDENCE FOR COMPLEX FORMATION IN THE TRI-n-BUTYL PHOSPHATE-WATER-NITRIC ACID SYSTEM (1960)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 64 (1960), S. 1324-1327 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100838a048
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  • 3
    Electronic Resource
    Electronic Resource
    Annealing kinetics of a-Si:H deposited by concentric-electrode rf glow discharge at room temperature (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1826-1831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The irreversible isothermal annealing of the as-deposited defects of hydrogenated amorphous silicon, a-Si:H, deposited at room temperature by concentric-electrode radio-frequency glow discharge is studied using dark and photoconductivity, space-charge limited current, and time-of-flight. The photoconductivity increases as a power law of the annealing time with exponent 0.8. The density of states at the Fermi level, measured by space-charge limited current, is inversely proportional to the annealing time. These results are compatible with bimolecular annealing kinetics. The dark conductivity obeys a Meyer–Nelder rule during the isothermal anneal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353167
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  • 4
    Electronic Resource
    Electronic Resource
    Deposition of amorphous silicon using a tubular reactor with concentric-electrode confinement (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3981-3989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality, hydrogenated amorphous silicon (a-Si:H) is deposited at room temperature by rf glow discharge at a high deposition rate using a tubular reactor with cylindrical symmetry (concentric-electrode plasma-enhanced chemical vapor deposition, CE-PECVD). Using the novel CE-PECVD design, room-temperature deposition of a-Si:H with growth rates up to 14 A(ring) s−1, low hydrogen concentration ((approximately-less-than)10%), and the bonded hydrogen in the Si-H monohydride configuration, is achieved for the first time using an rf glow-discharge technique. The influence of the deposition parameters (silane flow rate, pressure, and power density) on the growth rate, optical band gap, and silicon-hydrogen bonding configuration, is quantitatively predicted using a deposition mechanism based on the additive contribution of three growth precursors, SiH2, SiH3, and Si2H6, with decreasing sticking coefficients of 0.7, 0.1, and 0.001, respectively. The low hydrogen concentration is due to the enhanced ion bombardment resulting from the concentric electrode design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350870
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of the flow of silane on the properties of a-Si:H deposited by concentric-electrode radio frequency glow-discharge (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3990-3996 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High band gap, device-quality, hydrogenated amorphous silicon (a-Si:H) was deposited from silane at room temperature using concentric-electrode plasma-enhanced chemical vapor deposition (CE-PECVD). Increasing the flow of silane from 15 to 99 sccm resulted in a continuous increase of the optical band gap, Eopt, from 1.7 to 2.1 eV, and changed the dominant bonding configuration from Si-H to Si-H2. The total hydrogen concentration as determined from the integrated absorption of the SiHx stretching bond increased from 7% to 15%. As Eopt varied between 1.7 and 2.1 eV, the photoconductivity, σph, decreased from 10−5 to 10−7 Ω−1 cm−1 and the dark conductivity, σd, dropped from 10−10 to 10−14 Ω−1 cm−1 (σph and σd measured at room temperature after a 1 h anneal at 200 °C). These results are superior to those obtained using a-SiC:H alloys deposited under comparable conditions (i.e., without hydrogen dilution). After annealing, three different conduction paths were identified and correlate with the silicon-hydrogen bonding configuration. The photosensitivity of high band gap a-Si:H films, σph/σd, follows Slobodin's rule for a-SiGe:H alloys. High band gap a-Si:H deposited by CE-PECVD has significant potential to challenge the role of a-SiC:H as the choice material for films with 1.7 (approximately-less-than) Eopt (approximately-less-than) 2.1 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350871
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  • 6
    Electronic Resource
    Electronic Resource
    Generating a jet of deagglomerated small particles in vacuum (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2529-2533 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a dust jet generator, which is a device for the deagglomeration of micron-sized and submicron-sized dust particles. In contrast to other mechanisms, it principally works without any gas and generates a dust jet with a speed up to 100 m/s relative to the surrounding gas. Compressed dust powder is fed onto the front side of a fast rotating cogwheel. Upon contact with the cogwheel, the dust is deagglomerated and the single particles are accelerated at a tangent to the circumference. Design details of the mechanism and characteristics of the dust jet are presented. We will use the dust jet for the investigation of collisions of individual particles with surfaces or other particles. Other possible applications of the dust jet generator are proposed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148154
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of Culture Age and Hexoses on Fatty Acid Oxidation by Leishmania major (1990)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 37 (1990), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The effect of culture age on the rate of oxidation of short-, medium-, and long-chain fatty acids by Leishmania major promastigotes was investigated. Promastigotes from 5-day stationary phase cultures oxidized several saturated fatty acids about 3-to-4-fold faster than cells from late log phase cultures, but [10−14C]oleate was oxidized 9-fold faster. The increase in rate of oxidation was partially reversed within 5 h and almost completely reversed within 30 h after resuspending cells from a 5-day stationary culture in fresh medium. Addition of acetate, leucine, or alanine caused moderate inhibitions of [1-14C]palmitate oxidation, while glycerol had little effect. Glucose, however, was a powerful inhibitor of the oxidation of [1-14C]palmitate and of [1-14C]octanoate. Mannose and fructose were also strong inhibitors of palmitate oxidation, but neither galactose, 2-deoxyglucose or 6-deoxyglucose caused appreciable inhibition. The extent of inhibition by acetate increased with increasing culture age, whereas inhibition by glucose decreased. In addition to demonstrating a reversible rise in β-oxidation capacity with culture age, these data also demonstrate a hitherto unrecognized strong and culture age-dependent inhibition of fatty acid oxidation by glucose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1990.tb01256.x
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  • 8
    Electronic Resource
    Electronic Resource
    Metabolic Interactions Between Glucose, Glycerol, Alanine and Acetate in Leishmania braziliensis panamensis Promastigotes (1989)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 36 (1989), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 13C-nuciear magnetic resonance (NMR) spectroscopy was used to investigate the products of glycerol and acetate metabolism released by Leishmania braziliensis panamensis promastigotes and also to examine the interaction of each of these substrates with glucose or alanine. The NMR data were supplemented by measurements of the rates of oxygen consumption and substrate utilization, and of 14CO2 production from 14C-labeIed substrate. Cells incubated with [2-13C]glycerol released acetate, succinate and D-lactate in addition to CO2. Cells incubated with acetate released only CO2. More succinate C-2/C-3 than C-l/C-4 was released from both [2-13C]glycerol and [2-13C]glucose, indicating that succinate was formed predominantly by CO2 fixation followed by reverse flux through part of the Krebs cycle. Some redistribution of the position of labeling was also seen in alanine and pyruvate, suggesting cycling through pyruvate/oxaloacetate/phosphoenolpyruvate. Cells incubated with combinations of 2 substrates consumed oxygen at the same rate as cells incubated with 1 or no substrate, even though the total substrate utilization had increased. When promastigotes were incubated with both glycerol and glucose, the rate of glucose consumption was unchanged but glycerol consumption decreased about 50%, and the rate of 14CO2 production from [l,(3)-14C]glycerol decreased about 60%. Alanine did not affect the rates of consumption of glucose or glycerol, but decreased 14CO2 production from these substrates by increasing flow of label into alanine. Although glucose decreased alanine consumption by 70%, it increased the rate of 14CO2 production from [U-14C]- and [l-14C]alanine by about 20%. This is consistent with rapid equilibration of alanine with pyruvate derived from glucose and yet little decrease in the specific activity of the large alanine pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1989.tb01077.x
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Osmotic Pressure on the Oxidative Metabolism of Leishmania major Promastigotes (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 38 (1991), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Leishmania major promastigotes were washed and resuspended in an iso-osmotic buffer. The rate of oxidation of 14C-labeled substrates was then measured as a function of osmolality. An acute decrease in osmolality (achieved by adding H2O to the cell suspension) caused an increase in the rates of 14CO2 production from [6-14C]glucose and, to a lesser extent, from [1, (3)-14C]glycerol. An acute increase in osmolality (achieved by adding NaCl, KCl, or mannitol) strongly inhibited the rates of 14CO2 production from [1-: 14C]alanine, [1-14C]glutamate, and [1, (3)-14C]glycerol. The rates of 14CO2 formation from [1-14C]laurate, [1-14C]acetate, and [2-14C]glucose (all of which form [1-14C]acetyl CoA prior to oxidation) were also inhibited, but less strongly, by increasing osmolality. These data suggest that with increasing osmolality there is an inhibition of mitochondrial oxidative capacity, which could facilitate the increase in alanine pool size that occurs in response to hyper-osmotic stress. Similarly, an increase in oxidative capacity would help prevent a rebuild up of the alanine pool after its rapid loss to the medium in response to hypo-osmotic stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1991.tb04434.x
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  • 10
    Electronic Resource
    Electronic Resource
    In Vitro Reversible Transformation of Leishmania braziliensis panamensis Between Promastigote and Ellipsoidal Forms (1987)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 34 (1987), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Raising the temperature of a log-phase culture of Leishmania braziliensis panamensis promastigotes from 26°C to 34°C resulted in formation of a culture containing 85% ellipsoidally shaped forms after 1.5 h. The temperature-induced ellipsoidal forms decreased in size but persisted in high proportion (85–95%) for at least 12 h at 34°C. Recovery from the ellipsoidal forms to a culture containing 85–95% promastigotes was observed after returning the temperature to 26°C. The time required for recovery increased markedly with the duration of the preceding heat treatment, up to about 70 h for a 12-h heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1987.tb03154.x
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