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Gravity as a probe for understanding pattern specification (Final Technical Report)

作者:科技文献资料网 时间:2018-10-19 10:36:27  浏览:9158   来源:科技文献资料网
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[唯一标识符]:CDSITC.AEROSPACE.N94-13418
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1994-13418; Reference AN: N94-13418
[标题]:Gravity as a probe for understanding pattern specification (Final Technical Report)
[作者]:MALACINSKI GEORGE M; NEFF ANTON W
[文摘]:Amphibian eggs from Xenopus laevis were employed as a model system. Xenopus embryos were demonstrated to be sensitive to novel force fields. Under clinostat-simulated weightlessness the location of the third cleavage furrow was shifted towards the equator; the dorsal lip was shifted closer to the vegetal pole; and head and eye dimensions of hatching tadpoles were enlarged. Effects of centrifuge-simulated hypergravity were the opposite of those of simulated weightlessness. Those morphological alterations had their own force-sensitive period, and a substantial spawning-to-spawning variation in sensitivity was observed. Despite those dramatic differences in embryogenesis, tadpoles at the feeding stage were largely indistinguishable from controls. (Derived from text)
[关键词]:CELL DIVISION; EMBRYOLOGY ; GRAVITATIONAL EFFECTS; GRAVITATIONAL PHYSIOLOGY; HIGH GRAVITY ENVIRONMENTS; MORPHOLOGY ; PHYSIOLOGICAL RESPONSES; WEIGHTLESSNESS SIMULATION; CENTRIFUGING STRESS; CLEAVAGE ; EGGS ; FROGS ; HEAVY WATER; MICROGRAVITY ; WEIGHTLESSN
[出版年份]:1993
[专业领域]:METEOROLOGY AND CLIMATOLOGY
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[文献类型]:科技报告
[标题]:Note on the Effect of Preemptive Policies on the Stability of a Priority Queue,
[作者]:marie, r. trivedi, k. s.
[机构]:Duke Univ.,Durham,NC. Dept. of Computer Sciences.*Air Force Office of Scientific Research,Bolling AFB,DC.
[关键词]:queueing theory,reprints,stability,scheduling,random variables,mathematical models,m/g/l queue,ntisdodxr,ntisdodaf
[出版年份]:1988
[报告时间]:1987,
[页码]:6p
[馆藏索取号]:AD-A186871
[总页数]:7


[文献类型]:科技报告
[标题]:U.S. Marine Aviation in World War II: VMF 124in the Solomons.
[作者]:kwallek, j. a.
[机构]:Air Command and Staff Coll.,Maxwell AFB,AL.
[关键词]:aerial warfare,marine corps aviation,fighter aircraft,firepower,islands,military tactics,pacific ocean,pilots,squadrons,warfare,pacific ocean islands,melanesia,history,solomon islands,world war 2,ntisdodxa
[出版年份]:1988
[报告号]:Rept no. ACSC-88-1515
[报告时间]:Apr 88,
[页码]:79p
[馆藏索取号]:AD-A192519
[总页数]:83



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