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  • COMMUNICATIONS AND RADAR  (2)
  • Pseudogenes  (1)
  • 1980-1984  (3)
  • 1960-1964
  • 1950-1954
  • 1935-1939
  • 1920-1924
  • 1984  (3)
Collection
Keywords
Publisher
Years
  • 1980-1984  (3)
  • 1960-1964
  • 1950-1954
  • 1935-1939
  • 1920-1924
Year
  • 1
    Electronic Resource
    Electronic Resource
    Evolutionary constraints and the neutral theory (1984)
    Springer
    Journal of molecular evolution 21 (1984), S. 90-92 
    Details
    ISSN: 1432-1432
    Keywords: Neutral theory ; Codon usage ; Synonymous condons ; Pseudogenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The neutral theory of molecular evolution postulates that nucleotide substitutions inherently take place in DNA as a result of point mutations followed by random genetic drift. In the absence of selective constraints, the substitution rate reaches the maximum value set by the mutation rate. The rate in globin pseudogenes is about 5 × 10−9 substitutions per site per year in mammals. Rates slower than this indicate the presence of constraints imposed by negative (natural) selection, which rejects and discards deleterious mutations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100633
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    Paper (German National Licenses)
    Fulltext
  • 2
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    VLF wave-particle interaction experiments by EXOS-B/Siple station transmissions (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The relationship between ground station signals and electron pitch angle distribution at L = 4 is reviewed, and signal intensity is discussed. There are two types of relationships between signals and electron distribution: (1) intensification of the signal by a distribution with a high pitch angle anisotropy of pancake type; and (2) triggering of emissions associated with transmissions by a high flux of electrons with low pitch angle anisotropy. The electric field intensity of ground signals is relatively low, which is consistent with those observed by IMP-6 and by a rocket.
    Keywords: COMMUNICATIONS AND RADAR
    Type: ESA Achievements of the Intern. Magnetospheric Study (IMS); p 529-532
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The MU radar now partly in operation (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The MU radar (middle- and upper-atmosphere radar) of RASC (Radio Atmospheric Science Center, Kyoto University) is now partly in operation, although the facility will be completed in 1985. The active array system of the radar makes it possible to steer the radar beam as fast as in each interpulse period. Various sophisticated experiments are expected to be performed by the system. A preliminary observation was successful to elucidate atmospheric motions during Typhoon No. 5 which approached the radar site in August, 1983.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP. Vol. 14; p 341-349
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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