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  • ASTRODYNAMICS  (2)
  • Genetics  (2)
  • General Chemistry
  • Physical Chemistry
  • 1985-1989  (4)
  • 1988  (4)
  • 1
    Electronic Resource
    Electronic Resource
    G-proteins in the signal-transduction pathways of Dictyostelium discoideum (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 9 (1988), S. 215-226 
    Details
    ISSN: 0192-253X
    Keywords: cAMP ; cGMP ; chemotaxis ; mutant ; desensitization ; receptor ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The functional interaction of surface cAMP receptors with effector enzymes via G-proteins was investigated in Dictyostelium discoideum. Several experimental conditions were used to investigate signal transduction, such as reduced temperatures, use of down-regulated cells and of mutants. The results are presented as a model describing the complex interaction between multiple forms of the surface cAMP receptor and different G-proteins that are responsible for the generation of the second messengers, cAMP, cGMP, InsP3 and Ca2+.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/dvg.1020090404
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The subcellular location of 4-aminobutyrate aminotransferase in Candida boidinii and its probable role in the breakdown of putrescine and spermidine (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 4 (1988), S. 149-153 
    Details
    ISSN: 0749-503X
    Keywords: Aminotransferase ; transaminase ; 4-aminobutyrate ; Candida ; putrescine ; spermidine ; cytisol ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: 4-Aminobutyrate aminotransferase (EC 2.6.1.19) was elevated in activity by 20- to 40-fold in cells of the yeast Candida boidinii grown on spermidine, putrescine, 4-acetamidobutyrate and 4-aminobutyrate compared with activities detected in cells grown on ammonium, methylamine or 6-aminohexanoate, confirming previous suggesions that it plays a key role in polyamine breakdown. Other enzymes of the proposed route of polymine breakdown were found to be non-coordinately induced or derepressed during growth on spermidine or its putative breakdown intermediates. The enzyme was not sedimented from spheroplast lysates at 100 000 × g, and it is concluded that it is conclded that it is probably cytosoilc in its subcellular location (although the data do not exclude the possiblity of its being vacuolar).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320040209
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    Paper (German National Licenses)
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  • 3
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    Survey of optimization techniques for nonlinear spacecraft trajectory searches (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mathematical analysis of the optimal search of a nonlinear spacecraft trajectory to arrive at a set of desired targets is presented. A high precision integrated trajectory program and several optimization software libraries are used to search for a converged nonlinear spacecraft trajectory. Several examples for the Galileo Jupiter Orbiter and the Ocean Topography Experiment (TOPEX) are presented that illustrate a variety of the optimization methods used in nonlinear spacecraft trajectory searches.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 88-4285 , AIAA/AAS Astrodynamics Conference; Aug 15, 1988 - Aug 17, 1988; Minneapolis, MN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Applications of square-root information filtering and smoothing in spacecraft orbit determination (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The JPL (Jet Propulsion Laboratory) Orbit Determination Software System is a set of computer programs developed for the primary purpose of determining the flight path of deep-space mission spacecraft in NASA's Planetary Program and highly elliptical orbiting spacecraft in Earth orbit. The filtering processes available within the JPL Orbit Determination Software are discussed, and several examples are presented. In particular, solutions obtained by the Square Root Information Filter (SRIF) using Bierman's Estimation Subroutine Library (ESL) are discussed and compared with the solutions obtained by the singular value decomposition (SVD) technique. It is concluded that the SRIF filtering and smoothing algorithms are efficient and numerically stable for well-conditioned systems. The use of Bierman's ESL simplifies the task of maintaining the orbit determination software by providing efficient, tested filtering tools. For solving a large well-conditioned system (rank higher than 120), SRIF is approximately four times faster than SVD; however, for solving an ill-conditioned system, SVD is recommended.
    Keywords: ASTRODYNAMICS
    Type: IEEE Conference on Decision and Control; Dec 07, 1988 - Dec 09, 1988; Austin, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
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