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11.
Genetic and physiological damage induced by cosmic radiation on dry plant seeds during space flight 总被引:3,自引:0,他引:3
A. R. Kranz 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1986,6(12):135-138
Total evaluation of cosmic radiation effect with or without discrimination of individualized HZE-ion effects in dry
seeds flown for 10 days on STS-9, yielded significant evidence for radiation damage in space. They depend on the biological criteria tested (seed germination, morphogenesis, embryo lethality, mutation rate) which stand for early, physiological and late genetic effects. They are also related to the radiation shielding environment in the space shuttle. Proceeding from these results three direct questions can be posed for present (LDEF-1) and future (ERA-1, D-2) experiments in space: What is the influence of cosmic radiation on cytogenetic repair and ontogenetic restitution processes? Does microgravity disorder the morphogenesis (i.e. growth and cell differentiation)? Is there an interaction between the effects of cosmic radiation and microgravity in eukaryotic plant systems? 相似文献
12.
A R Kranz K E Gartenbach M Pickert-Andres E Schopper B Baican 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1994,14(10):1021-1026
Results presented from recent space flight BION 9 show biological effects of different LET-classes of HZE-particles in different target regions of the seed (meristem and the whole embryo) of Arabidopsis thaliana (L.) Heyhn. HZE-one hit events and non-hit events, i.e. only hit by the low-LET background radiation, and their combined effects on the biological damage endpoint lethality are distinguished. This procedure is opening the opportunity of an approach to comparative studies of the biological effects induced by cosmic HZE-particles of different LET-ranges interacting in the complex cosmic radiation spectrum and with other space flight conditions. 相似文献
13.
Walden D.D. Blanshan K.M. Kranz G.M. 《Aerospace and Electronic Systems Magazine, IEEE》2000,15(5):19-23
Open system architectures based on commercial off-the-shelf (COTS) building block components offer the ability to leverage the latest technology into fielded products while minimizing the impact to the operational flight software, typically the most costly component of an avionics development or upgrade. Our team has developed a layered hardware and software approach based on industry standard hardware and software interfaces to abstract the application (operational) software developers from the underlying technology rolls to the hardware and operating system software that naturally occur as part of the commercial marketplace, A technology roll is defined as the replacement of a current product with a subsequent generation of a product from the same product family. In this article, we describe the components and the layered architecture of our open system architecture approach. We discuss specific system, hardware, and software technology insertions that incorporate the latest available technology and how these changes have been abstracted from the application software. The article concludes by discussing lessons Learned from the use of these common components and corresponding technology rolls across various platforms 相似文献