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  • INSTRUMENTATION AND PHOTOGRAPHY  (52)
  • Cell & Developmental Biology
  • 1975-1979  (82)
  • 1970-1974
  • 1960-1964  (12)
  • 1950-1954
  • 1979  (82)
  • 1963  (12)
Collection
Keywords
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Years
  • 1975-1979  (82)
  • 1970-1974
  • 1960-1964  (12)
  • 1950-1954
Year
  • 1
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    Airborne laser induced fluorescence system for measuring OH and other trace gases in the parts-per-quadrillion to parts-per-trillion range (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Described in detail is a laser induced fluorescence system which has been successfully interfaced with two aircraft sampling platforms (i.e., Sabreliner jet and an L-188C Electra). This system, which has been under development for four years, presently consists of the following major components: (1) a Nd-Yag laser driven oscillator-amplifier dye laser; (2) a sampling manifold with associated fluorescence detection optics; (3) an OH calibration chamber; (4) a laser beam steering assembly; and (5) sampling electronics and data processing hardware. During the last three years, this system has been flown some 50,000 air miles making tropospheric OH radical measurements over the latitude range of 70 N to 57 S. OH concentrations measured during these flights have ranged from 30 parts-per-quadrillion (3.7 x 10 to the 5th molecules/sq cm) at altitudes of 6 km to 0.8 parts-per-trillion (2.0 x 10 to the 7th molecules/sq cm) at 0.5 km. Computations have been completed which indicate that the existing aircraft system with modest modifications should also be capable of detecting natural tropospheric levels of NO, SO2, CH2O, NO2, HNO2, NO3, H2O2 and CS2 by using both conventional laser-induced fluorescence methodology and multiphoton techniques.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 50; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Partial regeneration of the above-elbow amputated rat forelimb. II. Electrical and mechanical facilitationSupported by the Veterans Administration Medical Research Program Project Number 7004-04 and a Medical Investigatorship Award to P.P. (1979)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 159 (1979), S. 439-451 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: This investigation was undertaken to examine the observations of Becker ('72) pertaining to the electrical facilitation of partial limb regenerative responses by means of Ag-Pt wire couples applied to the limb stumps of young, forelimb-amputated white rats. Additionally, in order to examine the possible role of mechanical effects of such device implantations, we have employed uncoupled devices delivering no current or potential difference. In the present experiments, in response to coupled device implantation, cartilage and bone were actively formed in the vicinity of the Pt electrode tip. These tissues contributed to the lengthwise extension of the limb and to the partial restoration of the distal humeral extremity. In limbs bearing the uncoupled electrical devices, qualitatively similar responses were noted, but osteogenesis was diminished in extent compared to that seen in limbs bearing the active or coupled devices. It is therefore necessary to consider the role of mechanical factors in the elicitation of the observed regenerative responses. Myogenesis was enhanced in electrically stimulated limbs, but not in those rats bearing uncoupled devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051590309
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Control of the Balb/c-3T3 cell cycle by nutrients and serum factors: Analysis using platelet-derived growth factor and platelet-poor plasma (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 99 (1979), S. 395-405 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Much controversy regarding the relationship between nutrients and serum in regulation of cell growth can be reconciled by recognizing that serum contains multiple factors which regulate different events in the cell cycle. Serum was fractioned into a platelet-derived growth factor (PDGF), which induces cells to become competent to synthesize DNA, and plasma which allows competent cells to traverse G0/G1 and enter the S phase. Nutrients are not required for the cellular response to PDGF; however amino acids are required for plasma to promote the entry of PDGF-treated, competent cells into S phase. The nutrient independent, PDGF-modulated, growth regulatory event (competence) is located 12 hours prior to the G1/S phase boundary in quiescent, density-arrested Balb/c-3T3 cells. The nutrient dependent, plasma-modulated event is located six hours prior to the G1/S phase boundary and corresponds in time to a plasma dependent growth arrest point. Moreover, plasma controls the concentration of amino acids required for DNA synthesis. Infection of density-arrested Balb/c-3T3 cells with SV40 overrides both the nutrient independent and the nutrient dependent growth regulatory events.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040990314
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The tumor promoter 12-0-tetradecanoyl-phorbol-13-acetate enhances the proliferative response of Balb/c-3T3 cells to hormonal growth factors (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 100 (1979), S. 413-424 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Stimulation of Balb/c-3T3 cell growth by TPA requires factors found in serum. We examined the interaction between TPA and serum growth factors in the stimulation of cell growth. The number of cells synthesizing DNA (incorporating 3H-thymidine) within 24 to 30 hours after the addition of TPA and the growth factors to density-inhibited Balb/c-3T3 cultures in serum-free medium was determined by autoradiography. With no additions or with TPA (30-300 ng/ml) alone, only 3-7% of cells synthesized DNA. However, TPA synergistically promoted DNA synthesis in combination with each of the defined serum growth fractions, platelet derived growth factor and platelet poor plasma. TPA also synergistically promoted DNA synthesis in combination with purified growth factors including fibroblast growth factor, insulin (10-6-10-5 M), and epidermal growth factor. In all conditions, TPA enhancement of DNA synthesis also resulted in an increase in cell number. Because TPA synergistically enhanced the activity of each growth factor tested, it did not act identically to any of the growth factors.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041000305
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    Paper (German National Licenses)
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  • 5
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    DSN water vapor radiometer: Tropospheric range delay calibration (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A discussion is presented of the Deep Space Network water vapor radiometer by means of simultaneous antenna temperature and radiosonde measurements at Edwards Air Force Base. The calibration of radiometer gain and hot load radiometric noise temperature is also described. Calibration equations are given. It is found that with a selected data set, the RMS error is less than 1 cm over a total delay range of 9 to 38 cm. Limitations on the use of the water vapor radiometer are also given.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 136-145
    Format: text
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  • 6
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    Sealed position sensitive hard X-ray detector having large drift region for all sky camera with high angular resolution (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A sealed position sensitive proportional counter filled with two atmospheres of 95% xenon and 5% methane, and containing a drift region of 24 atm cm, has operated in a stable manner for many months. The detector contains G-10 frames to support the anode and cathode wires. The detector was sealed successfully by a combination of vacuum baking the G-10 frames at 150 C for two weeks followed by assembly into the detector in an environment of dry nitrogen, and the use of passive internal getters. The counter is intended for use with a circumferential cylindrical collimator. Together they provide a very broad field of view detection system with the ability to locate cosmic hard X-ray and soft gamma ray sources to an angular precision of a minute of arc. A set of instruments based on this principle have been proposed for satellites to detect and precisely locate cosmic gamma ray bursts.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 7
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    Imaging proportional counter for X-ray astronomy (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A position-sensitive proportional counter capable of imaging X-rays (0.1-3 keV) over a 10 cm x 10 cm aperture has been constructed. Positioning is obtained by sensing the signals induced by an X-ray event on the two orthogonal sets of cathode wires. Each cathode is divided into a series of cathode strips, each 0.5 cm wide. An X-ray event induces signals on several adjacent strips. Signals from each cathode strip are amplified separately and then added in an equally weighted and an unequally weighted summing amplifier. The position in each direction is obtained by dividing the output of the unequally weighted summer by that of the equally weighted summer. At 0.94 keV, the accuracy of the position sensing is 190 microns. At the same energy, the energy resolution is approximately 65% (FWHM). The proportional counter system is currently being incorporated into a sounding rocket payload having metal mirror optics, which is being constructed by the X-ray astronomy group at the California Institute of Technology.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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  • 8
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    Thematic mapper design description and performance prediction (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The new generation of satellite-borne earth resources scanners, the Thematic Mapper, is being built for launch on the Landsat-D spacecraft. It will gather data for applications such as crop inventory, land use planning, forest management, and geology. This paper gives an overall design description, further discussion of principal design features, performance achievements where data are available, and system performance predictions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space optics; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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  • 9
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    Laser velocimetry and holographic interferometry measurements in transonic flows (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of the transonic flow about a two-dimensional airfoil have been made with holographic interferometry and laser velocimetry. Quantitative data obtained with the interferometer are compared to the laser velocimeter and surface pressure measurements to evaluate the accuracy of the technique. Good agreement in the results confirmed the two-dimensionality of the flow and the potential of the interferometer in making unsteady transonic flow measurements in the future.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Laser velocimetry and particle sizing; Third International Workshop; Jul 11, 1978 - Jul 13, 1978; West Lafayette, IN
    Format: text
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  • 10
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    Laser Doppler velocity measurements in subsonic, transonic, and supersonic turbulent boundary layers (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent measurements have used laser Doppler velocimetry to make direct measurements of the Reynolds stress in turbulent boundary layers in the Mach number range 1.5 to 3.0. A serious anomaly, however, is exhibited in these measurements in that the maximum of -u-prime v-prime occurs much farther from the wall than is reasonable for flow at constant pressure. The purpose of the present experiments was to obtain redundant data over a substantial range of Mach numbers (0.1-2.2) in an effort to resolve the anomaly in turbulent shearing stress.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Laser velocimetry and particle sizing; Third International Workshop; Jul 11, 1978 - Jul 13, 1978; West Lafayette, IN
    Format: text
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