...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Astrobiology >Reactive Oxygen Species in Emulated Martian Conditions and Their Effect on the Viability of the Unicellular Alga Scenedesmus dimorphus
【24h】

Reactive Oxygen Species in Emulated Martian Conditions and Their Effect on the Viability of the Unicellular Alga Scenedesmus dimorphus

机译：模拟火星条件中的活性氧物种及其对单细胞藻类裂缝段的生存性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Formation of oxygen-based free radicals from photochemical decomposition of hydrogen peroxide (H2O2) on Mars may be a key factor in the potential survival of terrestrial-like organisms on the red planet. Martian conditions that generate reactive oxygen species involve the decomposition of H2O2 at temperatures of around 278 K under relatively high doses of C-band ultraviolet radiation (UVC). This process is further amplified by the presence of iron oxides and perchlorates. Photosynthetic organisms exhibit a number of evolutionary traits that allow them to withstand both oxidative stress and UVC radiation. Here, we examine the effect of free radicals produced by the decomposition of H2O2 under emulated martian conditions on the viability of Scenedesmus dimorphus, a unicellular alga that is resistant to UVC radiation and varying levels of perchlorate and H2O2, both of which are present on Mars. Identification and quantification of free radicals formed under these conditions were performed with Electron Paramagnetic Resonance spectroscopy. These results were correlated with the viability of S. dimorphus, and the formation of oxygen-based free radicals and survival of the alga were found to be strongly dependent on the amount of H2O2 available. For H2O2 amounts close to those present in the rarefied martian environment, the products of these catalytic reactions did not have a significant effect on the algal population growth curve.
机译：MAR上过氧化氢（H2O2）的光化学分解的形成的基于氧的自由基可能是红色行星上陆地生物潜在存活的关键因素。产生反应性氧物质的火星条件涉及在相对高剂量的C波段紫外线辐射（UVC）下在约278k的温度下分解H2O2。通过存在氧化铁和高氯酸盐进一步扩增该方法。光合生物表现出许多进化性状，使它们能够承受氧化应激和UVC辐射。在这里，我们在模拟的火星条件下研究了H2O2的分解产生的自由基的效果，对Scenedesmus Dimorphus的可行性，一种耐uvc辐射和水平的高氯酸盐和H2O2的不同水平，这两者在火星上存在。用电子顺磁共振光谱进行在这些条件下形成的自由基的鉴定和定量。这些结果与S. Dimorphus的活力相关，并且发现含氧自由基的形成和藻类的存活率强烈依赖于可用的H 2 O 2的量。对于H2O2靠近稀土火星环境中存在的量，这些催化反应的产品对藻类种群生长曲线没有显着影响。

著录项

  • 来源
    《Astrobiology》 |2021年第6期|692-705|共14页
  • 作者

    Carolina Bagnato; Marcela S. Nadal; Dina Tobia; Mariana Raineri; Marcelo Vasquez Mansilla; Elin L. Winkler; Roberto D. Zysler; Enio Lima;

  • 作者单位

    Instituto de Energía y Desarrollo Sustentable (IEDS) CNEA Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Departamento de Física Médica Gerencia de Física CNEA Centro Atómico Bariloche;

    Laboratorio de Resonancias Magnéticas Gerencia de Física CNEA Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Departamento de Física Médica Gerencia de Física CNEA Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Laboratorio de Resonancias Magnéticas Gerencia de Física CNEA Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Laboratorio de Resonancias Magnéticas Gerencia de Física CNEA Centro Atómico Bariloche|Instituto Balseiro CNEA-Universidad Nacional de Cuyo Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Departamento de Física Médica Gerencia de Física CNEA Centro Atómico Bariloche|Laboratorio de Resonancias Magnéticas Gerencia de Física CNEA Centro Atómico Bariloche|Instituto Balseiro CNEA-Universidad Nacional de Cuyo Centro Atómico Bariloche;

    Instituto de Nanociencia y Nanotecnología (INN) CNEA-CONICET Centro Atómico Bariloche|Laboratorio de Resonancias Magnéticas Gerencia de Física CNEA Centro Atómico Bariloche;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Extremophiles; Scenedesmus dimorphus; Photo-Fenton reaction; Iron oxides; Perchlorate; Peroxide; UVC; EPR; Mars;

    机译：ExpealoOphiles;Scenedesmus Dimorphus;光芬顿反应;氧化铁;高氯酸盐;过氧化物;UVC;EPR;火星;

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