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  • 1
    Electronic Resource
    Electronic Resource
    Effect of altered urinarypH on tetracycline and doxycycline excretion in humans (1973)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 1 (1973), S. 267-282 
    Details
    ISSN: 1573-8744
    Keywords: tetracycline hydrochloride ; doxycycline hyclate ; urinarypH ; excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of altered urinary pH on the excretion of single doses of orally administered tetracycline hydrochloride and doxycycline hyclate was studied in humans. Alkalinization of the urine significantly enhanced the cumulative renal excretion of both tetracycline and doxycycline as compared to acidic urine treatments. Altered tubular reabsorption was assumed to have caused this effect, since tetracyclines have been shown to be more lipid soluble at their isoelectric pH (approximately the pH of the acidic urine treatment) as compared to more alkaline pHs. The renal clearance of doxycycline was significantly increased by urinary alkalinization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01060035
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    Paper (German National Licenses)
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  • 2
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    Lunar surface: Changes in 31 months and micrometeoroid flux (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A preliminary comparison of Surveyor 3 and Apollo 12 photographs of areas disturbed by the Surveyor is described. About 60 Surveyor pictures taken in April and May 1967 and 20 Apollo photographs including stereo pairs were examined in detail. Only one definite change in the surface, other than those produced by astronauts, was noted. This is a particle about 2 mm in diameter which appears in the Apollo photographs of a Surveyor footpad imprint but which does not appear in the Surveyor photographs. The walls made by Surveyor footpads and surface sampler were still in place, and surface areas darkened by ejected fines during the Surveyor landing still appeared dark. The absence of detectable craters in the footpad imprint implies a very low micrometeorite flux on the lunar surface.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 173-176
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Blowing of lunar soil by Apollo 12: Surveyor3 evidence (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: It is shown that the discoloration pattern of the Surveyor 3 camera provides evidence that the camera surface was whitened by the impact of particles blown from the lunar surface by the exhaust of the lunar module as it landed. It also indicates the velocity and direction at which these particles were ejected.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 94-96
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    NASA TECHNICAL REPORTS
  • 4
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    Cracking of lunar mare soil. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Demonstration that lunar soil deforms and cracks in the same manner as homogeneous isotropic terrestrial soil s of moderate bulk density with a small amount of cohesion. This conclusion is made from an analysis of Surveyor 3 TV pictures and of Apollo 11 closeup picture of lunar surface disturbances by bearing tests and instrument pressure.
    Keywords: SPACE SCIENCES
    Type: Nature; 234; Dec. 17
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Principal scientific results from the Surveyor program (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Surveyor program results, discussing lunar craters, rock fragments, particle size optical, thermal and radar characteristics and chemical composition
    Keywords: SPACE SCIENCES
    Type: ; ACE(
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  • 6
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    Blowing of lunar soil by Apollo 12 - Surveyor 3 evidence (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Surveyor 3 spacecraft TV camera surface discoloration patterns caused by lunar soil blown by Apollo 12 exhaust
    Keywords: SPACE SCIENCES
    Type: ; BROTECHNIKA, NO. 1(
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  • 7
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    Lunar surface - Changes in 31 months and micrometeoroid flux (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Low micrometeoroid flux on lunar surface from comparative Surveyor 3 and Apollo 12 pictures
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 8
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    Bearing strength of lunar soil. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Bearing load vs penetration curves have been measured on a 1.3 g sample of lunar soil from the scoop of the Surveyor 3 soil mechanics surface sampler, using a circular indentor 2 mm in diameter. Measurements were made in an Earth laboratory, in air. This sample provided a unique opportunity to evaluate earlier, remotely controlled, in-situ measurements of lunar surface bearing properties. Bearing capacity, measured at a penetration equal to the indentor diameter, varied from 0.02-0.04 N/sq cm at bulk densities of 1.15 g/cu cm to 30-100 N/sq cm at 1.9 g/cu cm. Deformation was by compression directly below the indentor at bulk densities below 1.61 g/cu cm, by outward displacement at bulk densities over 1.62 g/cu cm. Preliminary comparison of in-situ remote measurements with those on returned material indicates good agreement if the lunar regolith at Surveyor 3 has a bulk density of 1.6 g/cu cm at 2.5 cm depth.
    Keywords: SPACE SCIENCES
    Type: The Moon; 3; Dec. 197
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  • 9
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    On-surface and laboratory size measurements of fine lunar particles. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Measurements of particle size distribution in Apollo 12 sample 12029-8 in the laboratory and in Surveyor 3 scoop material by remote photometry. A table is compiled to summarize the data obtained by various authors from all Surveyor missions.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 241; Jan. 15
    Format: text
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  • 10
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    Unmanned surface traverses of Mars and Moon: Science objectives, payloads, operations (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Science objectives and properties to be measured are outlined for long surface traverse missions on Mars and the Moon, with remotely-controlled roving vehicles. A series of candidate rover payloads is proposed for each planet, varying in weight, cost, purpose, and development needed. The smallest weighs 35 kg; the largest almost 300 kg. A high degree of internal control will be needed on the Mars rover, including the ability to carry out complex science sequences. Decision-making by humans in the Mars mission includes supervisory control of rover operations and selection of features and samples of geological and biological interest. For the lunar mission, less control on the rover and more on earth is appropriate. Science portions of the rover mission profile are outlined, with timelines and mileage breakdowns. Operational problem areas for Mars include control, communications, data storage, night operations, and the mission operations system. For the moon, science data storage on the rover would be unnecessary and control much simpler.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-136810
    Format: application/pdf
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