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  • Life Sciences (General)  (3)
  • 5α-dihydrotestosterone  (2)
  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of steroid-receptor complexes on transcription by human hypertrophied prostatic RNA polymerases
    Amsterdam : Elsevier
    Molecular and Cellular Endocrinology 5 (1976), S. 269-288 
    Details
    ISSN: 0303-7207
    Keywords: 5α-dihydrotestosterone ; RNA polymerase ; androgen receptor ; prostate
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0303-7207(76)90089-7
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Similarities between 5α-dihydrotestosterone-receptor complexes from human and rat prostatic tissue: Effects on RNA polymerase activity
    Amsterdam : Elsevier
    Molecular and Cellular Endocrinology 3 (1975), S. 143-164 
    Details
    ISSN: 0303-7207
    Keywords: 5α-dihydrotestosterone ; RNA polymerase ; human hypertrophic prostate ; rat ventral prostate ; receptor
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0303-7207(75)90060-X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The short- and long-term mechanical properties of filled and unfilled thermotropic liquid crystalline polymer injection moldings (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 731-740 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The basic mechanical properties of a series of injection moldings of the thermotropic liquid crystalline polymer Vectra have been investigated to determine the effect of fillers on the short- and long-term mechanical properties of these materials. Mineral-filler addition results in a slight decrease in strength and an increase in stiffness in the flow direction, but has relatively little effect on the anisotropy. Glass fiber addition, on the other hand, may substantially lower the anisotropy depending on the degree of fiber orientation transverse to the flow direction. The glass fiber-filled grade investigated also showed improved creep properties at high temperature compared with both the unfilled and mineral-filled grades. © 1993 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480415
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Identification and quantification of Cu contamination on GaAs surfacesPaper presented at QSA 7, Guildford, September 1992. (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 51-55 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Secondary ion mass spectrometry has been used to identify the presence of Cu contamination on undoped semiinsulating GaAs wafer surfaces following polishing under certain conditions. The presence of a contaminating species on the wafer surface is indicated by the influence of pre-etch treatments on electrical measurements performed on heat-treated wafers, with and without Si implants. The identification of Cu as a contaminant is confirmed by photoluminescence measurements. With the appropriate wafer preparation process, the level of Cu contamination is below the SIMS detection limit of 〈1 × 1016 atoms cm-3.In the SIMS analysis of the surface-contaminated wafers, the Cu depth profile shape was dependent on the primary beam bombardment energy, suggesting a chemical segregation of Cu out of the altered layer, a redistribution that is known to occur in Si.To quantify the surface concentration of Cu, GaAs wafers were deliberately contaminated with Cu, heat treated and analysed with glow discharge mass spectrometry and SIMS to provide a cross-calibration.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740210108
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    Paper (German National Licenses)
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  • 5
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    Considerations for Life Science experimentation on the Space Shuttle (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The conduct of Life Science experiments aboard the Shuttle Spacelab presents unaccustomed challenges to scientists. Not only is one confronted with the challenge of conducting an experiment in the unique microgravity environment of a orbiting spacecraft, but there are also the challenges of conducing experiments remotely, using equipment, techniques, chemicals, and materials that may differ from those standardly used in ones own laboratory. Then there is the question of "controls." How does one study the effects of altered gravitational fields on biological systems and control for other variables like vibration, acceleration, noise, temperature, humidity, and the logistics of specimen transport? Typically, the scientist new to space research has neither considered all of these potential problems nor has the data at hand with which to tackle the problems. This paper will explore some of these issues and provide pertinent data from recent Space Shuttle flights that will assist the new as well as the experienced scientist in dealing with the challenges of conducting research under spaceflight conditions.
    Keywords: Life Sciences (General)
    Type: ASGSB bulletin : publication of the American Society for Gravitational and Space Biology (ISSN 0898-4697); Volume 6; 1; 129-36
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Trace gas absorption spectroscopy using laser difference-frequency spectrometer for environmental application (2001)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A widely tunable infrared spectrometer based on difference frequency generation (DFG) has been developed for organic trace gas detection by laser absorption spectroscopy. On-line measurements of concentration of various hydrocarbons, such as acetylene, benzene, and ethylene, were investigated using high-resolution DFG trace gas spectroscopy for highly sensitive detection.
    Keywords: Life Sciences (General)
    Type: Laser physics (ISSN 1054-660X); Volume 11; 5; 594-9
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Physical basis for altered stem elongation rates in internode length mutants of Pisum (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Biophysical parameters related to gibberellin (GA)-dependent stem elongation were examined in dark-grown stem-length genotypes of Pisum sativum L. The rate of internode expansion in these genotypes is altered due to recessive mutations which affect either the endogenous levels of, or response to, GA. The GA deficient dwarf L181 (ls), two GA insensitive semierectoides dwarfs NGB5865 and NGB5862 (lka and lkb, respectively) and the slender' line L197 (la crys), which is tall regardless of GA content, were compared to the wild-type tall cultivar, Torsdag. Osmotic pressure, estimated by vapor pressure osmometry, and turgor pressure, measured directly with a pressure probe, did not correlate with the differences in growth rate among the genotypes. Mechanical wall properties of frozen-thawed tissue were measured using a constant force assay. GA deficiency resulted in increased wall stiffness judged both on the basis of plastic compliance and plastic extensibility normalized for equal stem circumference. Plastic compliance was not reduced in the GA insensitive dwarfs, though lka reduced circumference-normalized plasticity. In contrast, in vivo wall relaxation, determined by the pressure-block technique, differed among genotypes in a manner which did correlate with extension rates. The wall yield threshold was 1 bar or less in the tall lines, but ranged from 3 to 6 bars in the dwarf genotypes. The results with the ls mutant indicate that GA enhances stem elongation by both decreasing the wall yield threshold and increasing the wall yield coefficient. In the GA-insensitive mutants, lka and lkb, the wall yield threshold is substantially elevated. Plants possessing lka may also possess a reduced wall yield coefficient.
    Keywords: Life Sciences (General)
    Type: Plant physiology (ISSN 0032-0889); 94; 166-73
    Format: text
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    NASA TECHNICAL REPORTS
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