Science
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Monkeys in which nerves innervating the flexor muscles of the forearm and hand (the ulnar or the median nerve) had been surgically cross-united with the nerve innervating the extensor muscles (the radial nerve), and vice versa, showed excellent (ulnar-radial crosses) to moderate (median-radial crosses) control of movement performance after regeneration. Antagonistic movement responses were seen occasionally, but these were corrected almost immediately. Stimulation of the crossed nerves showed that they had innervated the antagonistic muscle groups. The results reveal the capacity of the primate central nervous system to adapt to gross disturbances imposed on the execution of movements by changes in peripheral innervation.
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Bacteria-free hydra, cultured in sterile media, were fed bacteria-free larvae of Artemia salina. Normal growth and budding were obtained in symbiotic and aposymbiotic Hydra viridis. ⋯ An exogenous budding factor, which can be provided by nonsterile Artemia larvae, or even by some bacteria, appears to be required by these nonsymbiotic hydra. This factor is endogenous in Hydra viridis.
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Because a line was inadvertently omitted, the article "Reagan reforms create upheaval at NIOSH" (News and Comment, 9 Oct., p. 166) stated on p. 168 that Donald Millar, new director of the National Institute for Occupational Safety and Health (NIOSH), believes that NIOSH should be separated from the Centers for Disease Control in Atlanta. The sentence should have read, "Millar says one of the things he learned as acting director [of NIOSH] is that NIOSH should be moved to Atlanta or that its ties to CDC should be severed." Millar, who wants strengthened ties between NIOSH and CDC, favors the former alternative.