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  • 1
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    X-ray spectroscopy with the ANS satellite (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: Preliminary results from the Bragg crystal spectrometer on the ANS satellite are given. No significant Si XIII and Si XIV narrow line emission has been detected from Cygnus X-1, -2, or -3.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center X-ray Binaries; p 49-52
    Format: text
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  • 2
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    Effect of prolonged space flight on cardiac function and dimensions (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: By taking advantage of the capabilities of echocardiography to measure noninvasively left ventricular volume, stroke volume, and ejection fraction, and of the fact that the astronauts were routinely subjected to lower body negative pressure (whereby cardiac filling is progressively decreased), it was possible to construct classic ventricular function curves noninvasively, thereby obviating the difficulties encountered in comparing cardiac function at different end-diastolic volumes preflight and postflight. In this manner, the effect of an 84-day period of weightlessness on cardiac structure and function was evaluated in the Skylab 4 astronauts.
    Keywords: AEROSPACE MEDICINE
    Type: NASA., JSC Biomed. Results from Skylab; p 366-371
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  • 3
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    Studies of acid-base homeostasis during simulated weightlessness: Application of the water immersion model to man (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The effects of water immersion on acid-base homeostasis were investigated under carefully controlled conditions. Studies of renal acidification were carried out on seven healthy male subjects, each consuming a diet containing 150 meq sodium and 100 meq potassium. Control and immersion studies were carried out on each subject on the fourth and sixth days, respectively, of dietary equilibration, by which time all subjects had achieved sodium balance. The experimental protocols on study days were similar (except for the amount of water administered).
    Keywords: AEROSPACE MEDICINE
    Type: NASA. Johnson Space Center Proc. of the 1973 JSC Endocrine Program Conf.; 11 p
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  • 4
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    Observation of X-ray eclipses from LMC X-4 (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Observations made with the Rotation Modulation Collimator system (RMC) have revealed that X-ray source X-4 in the Large Magellanic Cloud (LMC X-4) is most likely part of a binary system. An analysis of the star's coordinates is presented, with attention given to orbital period and flux intensity variations. Stellar mass and orbital inclination angle are estimated for both X-4 and its companion star.
    Keywords: ASTRONOMY
    Type: Nature; 271; Jan. 5
    Format: text
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  • 5
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    The Einstein /HEAO 2/ X-ray Observatory (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Einstein (HEAO 2) X-ray Observatory, launched in 1978, includes a fully imaging focusing X-ray telescope with an angular resolution of a few arc sec, a field of view of up to one deg, and a sensitivity several hundred times greater than previously available in any X-ray astronomy experiment. A high-resolution imager, an imaging proportional counter, a focal plane crystal spectrometer, and a monitor proportional counter are among the principal instruments on board the Einstein X-ray Observatory. About 20% of the total effective observing time in the first year of the X-ray astronomy experiment has been reserved for guest observers.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 230
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  • 6
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    Effects of water immersion to the neck on pulmonary circulation and tissue volume in man (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A rapid noninvasive breathing method is used to obtain serial measurements of the pulmonary capillary blood flow, diffusing capacity per unit of alveolar volume, combined pulmonary tissue plus capillary volume, functional residual capacity, and oxygen consumption in five normal subjects undergoing 6 h of sitting, 4 h of sitting while immersed to the neck in thermoneutral water, and 4 h of lying in thermoneutral water to the neck. The rebreathing method employed a test gas mixture containing 0.5% C2H2, 0.3% C(18)O, 10% He, 21% O2, and balance N2. It is shown that immersion to the neck in the seated posture results in significant increases in sodium excretion cardiac output, and diffusing capacity per unit of alveolar volume. The pulmonary tissue plus capillary volume did not change, demonstrating that the central vascular engorgement induced by water immersion is not accompanied by significant extravasation of fluid into the pulmonary interstitial space.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 40; Mar. 197
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  • 7
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    Comparison of water immersion and saline infusion as a means of inducing volume expansion in man (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The study compares the natriuresis induced by head-out water immersion to that of a standard saline infusion and assesses the relative effectiveness of these two techniques as volume determinants of renal sodium and water handling in humans in a seated posture. The data obtained show that the volume stimulus of immersion is identical to that of standard saline-induced extracellular fluid volume expansion (ECVE) in normal seated subjects. The ability of head-out water immersion to induce a natriuresis without a concomitant increase in total blood volume and with a decrease in body weight suggests that water immersion may be preferred as an investigative tool for assessing the effects of ECVE in man.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 39; July 197
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  • 8
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    Suppression of ADH during water immersion in normal man (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A study was undertaken to ascertain whether diuresis induced by immersion is medicated by an inhibition of ADH. Immersion resulted in a progressive decrease in ADH excretion from 80.1 + or - 7 (SEM) to 37.3 + or - 6.3 microU/min (P less than 0.025). Cessation of immersion was associated with a marked increase in ADH from 37.3 + or - 6.3 microU/min to 176.6 + or - 72.6 microU/min during the recovery hour (P less than 0.05). Concomitant with these changes, urine osmolality decreased significantly beginning as early as the initial hour of immersion from 1044 + or - 36 to 542 + or - 66 mosmol/kg H2O during the final hour of immersion (P less than 0.001). These findings are consistent with the earlier suggestion that suppression of ADH release contributes to enhanced free water clearance in hydrated subjects undergoing immersion.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 38; June 197
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  • 9
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    Compact and diffuse X-ray sources in the core of the Perseus cluster /Abell 426/ (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data on the X-ray structure of the Perseus cluster of galaxies in the energy range from 2 to 10 keV are analyzed which were obtained during a 12-day observation with the rotating modulation collimator aboard SAS 3. In particular, the nature of the compact X-ray source coincident with NGC 1275 is examined. The data are shown to confirm the presence of a diffuse region of X-ray emission surrounding the nucleus of NGC 1275; it is found that a model which also includes a point source at the nucleus is consistent with the data if the point contribution is no larger than 20% of the X-ray flux detected within 3 to 5 arcmin of the galaxy. The results suggest that NGC 1275 may have accreted a large amount of gas from the intracluster medium and that the flux from the possible point source is consistent with a synchro/Compton model.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 221
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  • 10
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    Detection of X-ray emission from 3C 120 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: X-rays from a region containing the nucleus of the type 1 Seyfert galaxy 3C 120 have been detected using the rotating modulation collimator on board the SAS-3 X-ray observatory. The error circle has a 95% error radius of 1.0 arcmin. The measured X-ray (2-10 keV) flux is 5.4 by 10 to the -11th power erg/s per sq cm. The corresponding luminosity is 2.3 by 10 to the 44th power erg/s for the source at 200 Mpc. Synchrotron-Compton and hot plasma models are discussed.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 215
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