منابع مشابه
Surviving the breakup: the DNA damage checkpoint.
In response to even a single chromosomal double-strand DNA break, cells enact the DNA damage checkpoint. This checkpoint triggers cell cycle arrest, providing time for the cell to repair damaged chromosomes before entering mitosis. This mechanism helps prevent the segregation of damaged or mutated chromosomes and thus promotes genomic stability. Recent work has elucidated the molecular mechanis...
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A piloted simulation was conducted to study handling qualities for capsule spacecraft entering the Earth’s atmosphere. Eight evaluation pilots, including six pilot astronauts, provided Cooper-Harper ratings, workload ratings, and qualitative comments. The simulation began after descending through the atmospheric entry interface point and continued until the drogue parachutes deployed. There wer...
متن کاملMeasured spacecraft dynamic effects on atmospheric science instruments
On September 1991, NASA launched the Upper Atmosphere Research Satellite. In addition to its atmospheric science mission, spacecraft dynamic effects on science measurements were analyzed. The investigation included two in-flight experiments to determine how each on-board instrument, subsystem and environmental disturbance contributed to the spacecraft dynamic response and how these disturbances...
متن کاملUse of non-thermal atmospheric plasmas to reduce the viability of Bacillus subtilis on spacecraft surfaces
Atmospheric pressure glow-discharge (APGD) plasmas have been proposed for sterilizing spacecraft surfaces prior to launch. The advantages of APGD plasmas for the sterilization of spacecraft surfaces include low temperatures at treatment sites, rapid inactivation kinetics of exposed microbial cells, physical degradation and removal of microbial cells, physical removal of organic biosignature mol...
متن کاملSwarm Keeping Strategies for Spacecraft under J2 and Atmospheric Drag Perturbations
This paper presents several new open-loop guidance methods for spacecraft swarms composed of hundreds to thousands of agents with each spacecraft having modest capabilities. These methods have three main goals: preventing relative drift of the swarm, preventing collisions within the swarm, and minimizing the propellant used throughout the mission. The development of these methods progresses by ...
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ژورنال
عنوان ژورنال: Wilderness & Environmental Medicine
سال: 2005
ISSN: 1080-6032
DOI: 10.1580/pr21-03.1