各种无活化方法对替代蛋白质颗粒对样品返回任务的影响
Aspen L Hirsch1, Emily P Seto2, Wayne W Schubert3
1School of Biological Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA.
Astrobiology
|February 6, 2026
概括
返回火星样本需要强大的灭菌. 酵母子是强大的生物制剂,对绝育方法进行了测试. 紫外线C (UVC) 辐射显示出对行星任务灭菌的前景.
科学领域:
- 行星科学 行星科学
- 微生物学 微生物学
- 生物化学 生物化学
背景情况:
- 来自火星的样本返回任务是行星科学的一个优先事项.
- 绝育技术对于防止地球生物圈被潜在的外星生命污染至关重要.
- 子是自我播种的蛋白质状粒子,是地球上最强大的生物制剂之一.
研究的目的:
- 评估各种杀菌技术对子活动的有效性.
- 为行星保护协议确定强大的生物指标.
- 评估紫外线C (UVC) 辐射在飞行中的灭菌的潜力.
主要方法:
- 使用酵母蛋白衍生物 (Sup35和Ure2) 作为生物指标.
- 暴露子各种消毒方法,包括干热,蒸汽过氧化,玛辐射和等离子体.
- 研究了260-270nm紫外线C (UVC) 辐射对子检测和生物活性的影响.
主要成果:
- 长时间的干热 (200°C),蒸汽过氧化,射辐射 (100kGy) 和He/水等离子体并没有消除酵母子活动.
- 紫外线C (UVC) 辐射 (260-270 nm) 持续16-24天,消除了Ure2子的检测和活性.
- 扩展的紫外线照射消除了Sup35的子检测,并降低了,但没有消除其生物活性.
结论:
- 标准的灭菌方法不足以禁用强大的生物制剂,如酵母.
- 紫外线C (UVC) 辐射显示出在行星任务中作为飞行中的杀菌的关键组成部分的潜力.
- 对紫外线参数进行进一步的研究是有必要的,以便在样本返回任务期间有效地保护行星.
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