• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied and Environmental Microbiology >Response of terrestrial microorganisms to a simulated Martian environment.
【24h】

Response of terrestrial microorganisms to a simulated Martian environment.

机译：陆地微生物对模拟火星环境的反应。

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soil samples from Cape Canaveral were subjected to a simulated Martian environment and assayed periodically over 45 days to determine the effect of various environmental parameters on bacterial populations. The simulated environment was based on the most recent available data, prior to the Viking spacecraft, describing Martian conditions and consisted of a pressure of 7 millibars, an atmosphere of 99.9% CO2 and 0.1% O2, a freeze-thaw cycle of -65 degrees C for 16 h and 24 degrees C for 8 h, and variable moisture and nutrients. Reduced pressure had a significant effect, reducing growth under these conditions. Slight variations in gaseous composition of the simulated atmosphere had negligible effect on growth. The freeze-thaw cycle did not inhibit growth but did result in a slower rate of decline after growth had occurred. Dry samples exhibited no change during the 45-day experiment, indicating that the simulated Martian environment was not toxic to bacterial populations. Psychotrophic organisms responded more favorably to this environment than mesophiles, although both types exhibited increases of approximately 3 logs in 7 to 14 days when moisture and nutrients were available.
机译：将来自卡纳维拉尔角的土壤样品置于模拟的火星环境中，并在45天之内定期进行测定，以确定各种环境参数对细菌种群的影响。模拟环境基于维京号航天飞机之前的最新可用数据，描述了火星的状况，由7毫巴的压力，99.9％的CO2和0.1％的O2的大气，-65度的冻融循环组成C保持16小时，24 C保持8小时，并调节水分和养分。减压具有重要作用，在这些条件下会降低生长。模拟大气中气体成分的轻微变化对生长的影响可忽略不计。冻融循环不会抑制生长，但会导致生长后的下降速度减慢。在45天的实验过程中，干燥的样品没有表现出任何变化，表明模拟的火星环境对细菌种群没有毒性。精神营养生物对这种环境的反应比中温微生物更有利，尽管在有水分和营养的情况下，这两种类型在7至14天内显示出约3 log的增长。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号