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  • SPACE RADIATION  (4)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (3)
  • SPACE BIOLOGY  (3)
  • 1
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    Intramolecular interactions in aminoacyl nucleotides: Implications regarding the origin of genetic coding and protein synthesis (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Cellular organisms store information as sequences of nucleotides in double stranded DNA. This information is useless unless it can be converted into the active molecular species, protein. This is done in contemporary creatures first by transcription of one strand to give a complementary strand of mRNA. The sequence of nucleotides is then translated into a specific sequence of amino acids in a protein. Translation is made possible by a genetic coding system in which a sequence of three nucleotides codes for a specific amino acid. The origin and evolution of any chemical system can be understood through elucidation of the properties of the chemical entities which make up the system. There is an underlying logic to the coding system revealed by a correlation of the hydrophobicities of amino acids and their anticodonic nucleotides (i.e., the complement of the codon). Its importance lies in the fact that every amino acid going into protein synthesis must first be activated. This is universally accomplished with ATP. Past studies have concentrated on the chemistry of the adenylates, but more recently we have found, through the use of NMR, that we can observe intramolecular interactions even at low concentrations, between amino acid side chains and nucleotide base rings in these adenylates. The use of this type of compound thus affords a novel way of elucidating the manner in which amino acids and nucleotides interact with each other. In aqueous solution, when a hydrophobic amino acid is attached to the most hydrophobic nucleotide, AMP, a hydrophobic interaction takes place between the amino acid side chain and the adenine ring. The studies to be reported concern these hydrophobic interactions.
    Keywords: SPACE BIOLOGY
    Type: NASA, Washington Second Symposium on Chemical Evolution and the Origin and Evolution of Life; p 71
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  • 2
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    Solar radiation in the extreme ultraviolet and its variation with solar rotation (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Solar UV radiation measurements by OSO-3, obtaining flux variation over solar rotation period
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
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  • 3
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    Solar flares in the extreme ultraviolet. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Measurements of flare-related impulsive enhancements in solar emission lines in the extreme ultraviolet, observed from the satellite OSO-III, are reported. The enhancement of a line, expressed in percent of the total disk intensity in the line, is of the same order of magnitude as the flare area, expressed in heliocentric square degrees. Rise-times and decay-times of impulsive enhancements average about 2 min and 5 min, respectively. The maximum enhancements of radiation from ions in the chromosphere-corona transition region precede the H-alpha maximum by an average of 2 min, and occur in the same period of time as the hard component of solar X rays and the impulsive microwave bursts. Coronal lines in the extreme ultraviolet are less impulsive than the transition region lines in flare-related enhancements and their maxima follow the H-alpha maximum.
    Keywords: SPACE RADIATION
    Type: Solar Physics; 21; Dec. 197
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  • 4
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    Application of multidisciplinary optimization methods to the design of a supersonic transport (1992)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A new optimization based design method is discussed. This method is based on integrating existing disciplinary analysis and sensitivity analysis techniques by means of generalized sensitivity equations. A generic design system implementing this method is described. The system is being used to design the configuration and internal structure of a supersonic transport wing for optimum performance. This problem combines the disciplines of linear aerodynamics, structures, and performance. Initial results which include the disciplines of aerodynamics and structures in a conventional minimum weight design under static aeroelastic constraints are presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD, Integrated Design Analysis and Optimisation of Aircraft Structures; 5 p
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  • 5
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    Multidisciplinary design integration system for a supersonic transport aircraft (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An aircraft preliminary design system which provides the multidisciplinary communications and couplings between several engineering disciplines is described. A primary benefit of this system is to demonstrate advanced technology multidisciplinary design integration methodologies. The current version includes the disciplines of aerodynamics and structures. Contributing engineering disciplines are coupled using the Global Sensitivity Equation approach to influence the global design optimization problem. A high speed civil transport configuration is used for configuration trade studies. Forty four independent design variables are used to control the cross-sectional areas of wing rib and spar caps and the thicknesses of wingskincover panels. A total of 300 stress, strain, buckling and displacement behavioral constraints and minimum gages on the design variables were used to optimize the idealized wing structure. The goal of the designs to resize the wing cover panels and internal structure for minimum mass.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 92-4841 , ; 13 p.|AIAA, USAF, NASA, and OAI, Symposium on Multidisciplinary Analysis and Optimization; Sept. 21-23, 1992; Cleveland, OH; United States
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  • 6
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    Solar radiation in the extreme ultraviolet and its variation with solar rotation (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Solar extreme UV radiation measurements over rotation period onboard satellite OSO-3, using atmospheric absorption correction
    Keywords: SPACE RADIATION
    Type: COSPAR, PLENARY MEETING, 13TH; May 20, 1970 - May 29, 1970; LENINGRAD; USSR
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  • 7
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    Solar EUV enhancements associated with flares. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Temporal variations of solar EUV enhancements associated with flares measured by spectrometer aboard OSO 3 satellite
    Keywords: SPACE RADIATION
    Type: PLENARY MEETING; May 09, 1968 - May 21, 1968; TOKYO; JAPAN
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  • 8
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    Planetary quarantine: Principles, methods, and problems (1975)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Requirements for planetary quarantine programs focus on microbial life forms as the primary contamination threat carried by spacecraft to a planet, or back to earth from another planet or outer space. Constraints on planetary flight missions and forthcoming Martian landings are depicted.
    Keywords: SPACE BIOLOGY
    Type: Found. of Space Biol. and Med., Vol. 1; p 403-430
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  • 9
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    Application of multidisciplinary optimization methods to the design of a supersonic transport (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An optimization design method is discussed. This method is based on integrating existing disciplinary analysis and sensitivity analysis techniques by means of generalized sensitivity equations. A generic design system implementing this method is described. The system is being used to design the configuration and internal structure of a supersonic transport wing for optimum performance. This problem combines the disciplines of linear aerodynamics, structures, and performance. Initial results which include the disciplines of aerodynamics and structures in a conventional minimum weight design under static aeroelastic constraints are presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-104073 , NAS 1.15:104073 , North Atlantic Treaty Organization-AGARD Structures and Materials Panel Meeting; May 01, 1991 - May 02, 1991; Bath
    Format: application/pdf
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  • 10
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    Rationalization of some genetic anticodonic assignments (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The hydrophobicity of most amino acids correlates well with that of their anticodon nucleotides, with Trp, Tyr, Ile, and Ser being the exceptions to this rule. Using previous data on hydrophobicity and binding constants, and new data on rates of esterification of polyadenylic acid with several N-acetylaminoacyl imidazolides, several of the anticodon assignments are rationalized. Chemical reasons are shown supporting the idea of the inclusion of the Ile in the catalog of biological amino acids late in the evolution, through a mutation of the existing tRNA and its aminoacyl-tRNA-synthetase. It was found that an addition of hexane increases the incorporation of hydrophobic Ac-Phe into poly-A, in support of the Fox (1965) and Oparin (1965) emphasis on the biogenetic importance of phase-separated systems.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life (ISSN 0302-1688); 16; 1 19
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