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  • 1975-1979  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Formation of triple-stranded bovine DNA in vitro (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 86-87 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We used a magnesium salt of bovine DNA, which was prepared from bovine spleen by substituting MgCl2 for the sodium chloride-sodium citrate medium (SSC) in a standard DNA preparation procedure4. Sodium xylene sulphonate (Naxonate G) was added to precipitate protein. The MgDNA so prepared was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254086a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    dunce, a mutant of Drosophila deficient in learning (1976)
    National Academy of Sciences
    Details
    Publication Date: 1976-05-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 3
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    Formation of triple-stranded bovine DNA in vitro (1975)
    Springer Nature
    Details
    Publication Date: 1975-03-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 4
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    A review of electron bombardment thruster systems/spacecraft field and particle interfaces (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper collates and summarizes information on the field and particle interfaces of electron bombardment ion thruster systems. Major areas discussed are the nonpropellant particles, neutral propellant, ion beam, low energy plasma, and fields. Spacecraft functions and subsystems reviewed are solar arrays, thermal control systems, optical sensors, communications, science, structures and materials, and potential control. An appendix is included to facilitate identification of specific interaction areas.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 78-677 , International Electric Propulsion Conference; Apr 25, 1978 - Apr 27, 1978; San Diego, CA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A review of electron bombardment thruster systems/spacecraft field and particle interfaces (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Information on the field and particle interfaces of electron bombardment ion thruster systems was summarized. Major areas discussed were the nonpropellant particles, neutral propellant, ion beam, low energy plasma, and fields. Spacecraft functions and subsystems reviewed were solar arrays, thermal control systems, optical sensors, communications, science, structures and materials, and potential control.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-78850 , E-9571 , Intern. Elec. Propulsion Conf.; Apr 25, 1978 - Apr 27, 1978; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Electron bombardment propulsion system characteristics for large space systems (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The results of an anlaysis of electron bombardment ion propulsion systems for use in the transportation and on-orbit operations of large space systems are presented. Using baseline technology from the ongoing primary propulsion program and other sources, preliminary estimates of the expected characteristics of key system elements such as thrusters and propellant storage systems were performed. Projections of expected thruster performance on argon are presented based on identified constraints which limit the achievable thrust and/or power density of bombardment thrusters. System characteristics are then evaluated as a function of thruster diameter and specific impulse.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-X-73554 , E-8992 , Intern. Elec. Propulsion Conf.; Nov 15, 1976 - Nov 17, 1976; Key Biscayne, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Characteristics of primary electric propulsion systems (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of advanced electric propulsion systems will provide cost and performance benefits for future energetic space missions. A methodology to predict the characteristics of advanced electric propulsion systems was developed and programmed for computer calculations to allow evaluation of a broad set of technology and mission assumptions. The impact on overall thrust system characteristics was assessed for variations of propellant type, total accelerating voltage, thruster area, specific impulse, and power system approach. The data may be used both to provide direction to technology emphasis and allow for preliminary estimates of electric propulsion system properties for a wide variety of application.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 79-2041 , International Electric Propulsion Conference; Oct 30, 1979 - Nov 01, 1979; Princeton, NJ
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Electron bombardment propulsion system characteristics for large space systems (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Presented are the results of an analysis of electron bombardment ion propulsion systems for use in the transportation and on-orbit operations of large space systems. Using baseline technology from the ongoing primary propulsion program and other sources, preliminary estimates of the expected characteristics of key system elements such as thrusters and propellant storage systems have been performed. Projections of expected thruster performance on argon are presented based on identified constraints which limit the achievable thrust and/or power density of bombardment thrusters. System characteristics are then evaluated as a function of thruster diameter and specific impulse.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 76-1039 , International Electric Propulsion Conference; Nov 14, 1976 - Nov 17, 1976; Key Biscayne, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Primary electric propulsion for future space missions (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper presents data and a methodology to allow preliminary definition of electric propulsion systems. The elements comprising the thrust system are described parametrically. As an example, thruster performance is presented as a function of specific impulse and propellant type. Two power management and control (PMAC) approaches are considered to illustrate the use of the methodology. Power source characteristics are disregarded in the system description. One PMAC concept assumes a dc power input to the thrust system and all thruster power conditioned in a conventional manner; the other PMAC approach assumes an ac power source.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 79-0881 , Conference on Advanced Technology for Future Space Systems; May 08, 1979 - May 10, 1979; Hampton, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Characteristics of primary electric propulsion systems (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The use of advanced electric propulsion systems is expected to provide cost and performance benefits for future energetic space missions. A methodology to predict the characteristics of advanced electric propulsion systems was developed and programmed for computer calculations to allow evaluation of a broad set of technology and mission assumptions. The impact on overall thrust system characteristics was assessed for variations of propellant type, total accelerating voltage, thruster area, specific impulse, and power system approach. The data may be used both to provide direction to technology emphasis and allow for preliminary estimates of electric propulsion system properties for a wide variety of applications.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-79255 , E-166 , Intern. Conf. on Elec. Propulsion; Oct 31, 1979 - Nov 02, 1979; Princeton, NJ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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