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  • 1
    Electronic Resource
    Electronic Resource
    The indirect role of 2,4-D in the maintenance of apical dominance in decapitated sunflower seedlings (Helianthus annuus L.) (1979)
    Springer
    Planta 146 (1979), S. 475-480 
    Details
    ISSN: 1432-2048
    Keywords: Apical dominance ; Auxin ; Helianthus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When sufficient 2,4-D to maintain apical dominance for at least 21d was applied to the cut stem interface of sunflower seedlings which had been decapitated in the epicotyl, it could not be detected in the vicinity of the inhibited axillary buds 7d after application. Rather the 2,4-D concentrated at the stump apex where it was associated with formation of meristematic tissue. The results indicate an indirect role for 2,4-D in the maintenance of apical dominance in this system, possibly involving the induced meristematic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380863
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    Paper (German National Licenses)
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  • 2
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    Analysis of the ICE combiner for multiple antenna arraying (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The passage of the International Cometary Explorer (ICE) through the tail of comet Giacobini-Zinner took place on September 11, 1985, at approximately 11:04 GMT. The signal-to-noise ratio of the data received from the ICE spacecraft during the comet encounter was improved by arraying the 64-m antenna channels A and B (RCP and LCP) with the two 34-m antennas. Specially designed combiners were built to combine the signals received by the three antennas at the different DSN sites to ensure that the spacecraft's weak signal was received. Although the ICE spacecraft was built with a 5-W transmitter and with a small antenna designed to provide data from no farther than 1 million miles, these combiners provided enough signal margin during the encounter to receive the ICE transmitted data from within the tail of comet Giacobini-Zinner, 44 million miles from earth.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 269-277
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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