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Digitale Medien

Room-temperature single-wavelength optical latching circuits using GaAs bistable devices as logic gates (1988)

Jin, R. ; Hanson, C. ; Warren, M. ; [weitere]

Springer

Applied physics 46 (1988), S. 61-67

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ISSN: 1432-0649

Schlagwort(e): 42.80 ; 42.65 ; 42.70

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Room-temperature two-element latching circuits are experimentally demonstrated using GaAs multiple-quantum-well (MQW) nonlinear etalons under single-wavelength bistable operation. Signal power gains of up to 4 and contrast ratios of 10 have been achieved at milliwatt power levels with 1-μs pulses, which will allow the construction of more complicated digital optical circuits using diode lasers as the light sources. The problems of applying these nonlinear etalons to fast optical signal processing are also discussed. Numerical simulations show that the gain vanishes as the pulse duration decreases and approaches the carrier lifetime.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00698654

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2

Digitale Medien

Inhibitory effects of myxothiazol and 2-n-heptyl-4-hydroxyquinoline-N-oxide on the auxiliary electron transport pathways of Rhodobacter capsulatus (1986)

Richardson, D. J. ; Kelly, D. J. ; Jackson, J. B. ; [weitere]

Springer

Archives of microbiology 146 (1986), S. 159-165

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ISSN: 1432-072X

Schlagwort(e): Rhodobacter capsulatus ; Nitrate reduction ; Auxiliary electron transport ; Myxothiazol ; 2-n-heptyl-4-hydroxyquinoline-N-oxide ; Ubiquinone pool

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract The effects of various electron transport inhibitors upon the rates of reduction NO 3 - , dimethyl sulphoxide (DMSO) and N2O in anaerobic suspensions of Rhodobacter capsulatus have been studied. A new method for the determination of the rates of reduction of these auxiliary oxidants in intact cells is presented, based on the proportionality observed between the concentration of oxidant and the duration of the electrochromic carotenoid bandshift. For NO 3 - and N2O good agreement was found between rates of reduction determined using electrodes and those determined by the electrochromic method. Myxothiazol and antimycin A had no effect on the rates of reduction of NO 3 - and DMSO suggesting that the cytochrome b/c 1complex is not involved in electron transport to these oxidants. 2-n-heptyl-4-hydroxyquinoline-N-oxide (HOQNO) inhibited at two sites, one within the cytochrome b/c 1complex and the other on the nitrate reducing pathay, but had no effect on electron transport to N2O or DMSO. In both intact cells and cell free extracts, HOQNO had no effect on the nitrate dependent re-oxidation of reduced methylviologen (MVH2), a direct electron donor to nitrate reductase. Our data are consistent with a branch point for the auxiliary electron transport pathways at the level of the ubiquinone pool.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00402344

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3

Digitale Medien

The response of cancellous and cortical canine bone to hydroxylapatite-coated and uncoated titanium rods (1995)

Rashmir-Raven, A. M. ; Richardson, D. C. ; Aberman, H. M. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Biomaterials 6 (1995), S. 237-242

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ISSN: 1045-4861

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Medizin , Technik allgemein

Notizen: Because of the recent trend in total hip arthroplasty to achieve direct contact of the endoprosthesis with cortical bone, comparison of bone apposition from cortical bone and cancellous bone was performed. The response of cortical and cancellous bone to hydroxylapatite was also compared. Implants in cortical bone demonstrated a higher interface shear strength and more bone apposition than those in cancellous bone over all time periods tested. Hydroxylapatite coating increased the interfacial shear and bone apposition in cortical bone at all time periods and in both the 3- and 6-week cancellous bone models. The potential effect of stress shielding (and subsequent bone resorption) by femoral stems ingrown with cortical bone is discussed. © 1995 John Wiley & Sons, Inc.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jab.770060404

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4

Digitale Medien

FDA - Medical device news corner (1988)

Salman, Naser N. ; Richardson, D. Coleman

Hoboken, NJ : Wiley-Blackwell

Journal of Biomedical Materials Research 22 (1988), S. 119-123

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ISSN: 0021-9304

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Medizin , Technik allgemein

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jbm.820221304

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5

Digitale Medien

Dry erosion of epoxy/rubber compositesThe authors would like to thank Mr. Kwansiewski for his work on data collection through the independent study program during his final senior one summer month. They also appreciate the generous support of The Pennsylvania State University at Erie, The Behrend College. (1989)

Lhymn, C. ; Lhymn, Y. ; Richardson, D. E.

Hoboken, NJ : Wiley-Blackwell

Advances in Polymer Technology 9 (1989), S. 139-145

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ISSN: 0730-6679

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau

Notizen: The dry erosion behavior of epoxy/waste rubber composites has been investigated as a function of rubber content, air pressure (particle velocity), and impact angle. Morphological aspects have also been examined. The experimental data have been explained by means of an analytic equation derived from the crack propagation physics.

Zusätzliches Material: 12 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/adv.1989.060090204

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6

Digitale Medien

Mass algal culture in space operations (1960)

Gafford, Robert D. ; Richardson, D. E.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Biochemical and Microbiological Technology and Engineering 2 (1960), S. 299-311

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ISSN: 0368-1467

Schlagwort(e): Chemistry ; Biochemistry and Biotechnology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: A system is described which uses photosynthesis to regenerate oxygen from exhaled carbon dioxide in sealed cabins in the absence of gravity. Design considerations as to choice of algal strain, illumination, nutrients and gas-exchange methods are discussed. Details are given of such an apparatus, of laboratory size, used to evaluate selected semipermeable gas-exchange membranes. Data is presented and extrapolated to estimate size and weight of a possible manned space system.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jbmte.390020306

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7

Unbekannt

Tidal Distortion and Disruption of Rubble-Pile Method and Results (1998)

Love, S. ; Richardson, D. ; Bottke, W.

In: Other Sources

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Publikationsdatum: 2018-06-08

Schlagwort(e): Astrophysics

Materialart: Division for Planetary Sciences, Catastrophic Disruption; Tiberline Lodge, OR; United States

Format: text

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8

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Tidal Distortion and Disruption of Rubble-Pile Asteroids: Evidence and Applications (1998)

Richardson, D. ; Love, S. ; Bottke, W.

In: Other Sources

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Publikationsdatum: 2018-06-08

Schlagwort(e): Astrophysics

Materialart: Division for Planetary Sciences, Catastrophic Disruption; Tiberline Lodge, OR; United States

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9

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Spectroscopic requirements for HALOE: An analysis of the HCl and HF channels (1982)

Harvey, G. A. ; Rinsland, C. P. ; Richardson, D. J. ; [weitere]

In: CASI

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Publikationsdatum: 2019-06-28

Beschreibung: Spectral line parameters that have absorption features within the HCl and HF channels of the Halogen Occultation Experiment (HALOE) were evaluated. Line positions and identification of stratospheric and solar absorption features in both channels are presented based on an analysis of high-resolution, balloon-borne solar occultation spectra. For the relevant HCl and HF lines and for transitions of the interfering species, the accuracy of the following spectral parameters was assessed: line positions, line strengths, lower state energies, air-broadened collisional half-widths, and temperature dependence of the air-broadened half-widths. In addition, since the HALOE instrument and calibration cells are filled with mixtures of HCl in N2 and HF in N2, the self-broadened and N2-broadened HF and HCl half-widths were also considered.

Schlagwort(e): GEOPHYSICS

Materialart: NASA-TM-83232

Format: application/pdf

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Purification and characterization of ornithine transcarbamylase from pea (Pisum sativum L.) (1991)

Richardson, D. P. ; Slocum, R. D.

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: Pea (Pisum sativum) ornithine transcarbamylase (OTC) was purified to homogeneity from leaf homogenates in a single-step procedure, using delta-N-(phosphonacetyl)-L-ornithine-Sepharose 6B affinity chromatography. The 1581-fold purified OTC enzyme exhibited a specific activity of 139 micromoles citrulline per minute per milligram of protein at 37 degrees C, pH 8.5. Pea OTC represents approximately 0.05% of the total soluble protein in the leaf. The molecular weight of the native enzyme was approximately 108,200, as estimated by Sephacryl S-200 gel filtration chromatography. The purified protein ran as a single molecular weight band of 36,500 in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These results suggest that the pea OTC is a trimer of identical subunits. The overall amino acid composition of pea OTC is similar to that found in other eukaryotic and prokaryotic OTCs, but the number of arginine residues is approximately twofold higher. The increased number of arginine residues probably accounts for the observed isoelectric point of 7.6 for the pea enzyme, which is considerably more basic than isoelectric point values that have been reported for other OTCs.

Schlagwort(e): Life Sciences (General)

Materialart: Plant physiology (ISSN 0032-0889); 96; 262-8

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