Dependence of cyanobacterium growth and Mars-specific photobioreactor mass on total pressure, pN2 and pCO2.

IF 4.4 1区 物理与天体物理 Q1 MULTIDISCIPLINARY SCIENCES
Cyprien Verseux, Tiago P Ramalho, Emma Bohuon, Nils Kunst, Viktoria Lang, Christiane Heinicke
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Abstract

In situ resource utilization systems based on cyanobacteria could support the sustainability of crewed missions to Mars. However, their resource-efficiency will depend on the extent to which gases from the Martian atmosphere must be processed to support cyanobacterial growth. The main purpose of the present work is to help assess this extent. We therefore start with investigating the impact of changes in atmospheric conditions on the photoautotrophic, diazotrophic growth of the cyanobacterium Anabaena sp. PCC 7938. We show that lowering atmospheric pressure from 1 bar down to 80 hPa, without changing the partial pressures of metabolizable gases, does not reduce growth rates. We also provide equations, analogous to Monod's, that describe the dependence of growth rates on the partial pressures of CO2 and N2. We then outline the relationships between atmospheric pressure and composition, the minimal mass of a photobioreactor's outer walls (which is dependent on the inner-outer pressure difference), and growth rates. Relying on these relationships, we demonstrate that the structural mass of a photobioreactor can be decreased - without affecting cyanobacterial productivity - by reducing the inner gas pressure. We argue, however, that this reduction would be small next to the equivalent system mass of the cultivation system. A greater impact on resource-efficiency could come from the selection of atmospheric conditions which minimize gas processing requirements while adequately supporting cyanobacterial growth. The data and equations we provide can help identify these conditions.

蓝藻生长和火星特定光生物反应器质量与总压、pN2 和 pCO2 的关系。
以蓝藻为基础的原地资源利用系统可以支持载人火星任务的可持续性。然而,其资源效率将取决于必须在多大程度上处理火星大气中的气体以支持蓝藻生长。本研究的主要目的就是帮助评估这一程度。因此,我们首先研究了大气条件变化对蓝藻 Anabaena sp. PCC 7938 的光自养、重氮生长的影响。我们的研究表明,在不改变可代谢气体分压的情况下,将大气压力从 1 bar 降到 80 hPa 不会降低生长率。我们还提供了与莫诺方程类似的方程,描述了生长率与 CO2 和 N2 分压的关系。然后,我们概述了大气压力和成分、光生物反应器外壁的最小质量(取决于内外压差)和生长率之间的关系。根据这些关系,我们证明了光生物反应器的结构质量可以通过降低内部气体压力来减少,而不会影响蓝藻的生产率。不过,我们认为,与培养系统的等效系统质量相比,这种减少是微不足道的。对资源效率影响更大的可能是选择大气条件,在充分支持蓝藻生长的同时最大限度地降低气体处理要求。我们提供的数据和方程有助于确定这些条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
npj Microgravity
npj Microgravity Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
7.30
自引率
7.80%
发文量
50
审稿时长
9 weeks
期刊介绍: A new open access, online-only, multidisciplinary research journal, npj Microgravity is dedicated to publishing the most important scientific advances in the life sciences, physical sciences, and engineering fields that are facilitated by spaceflight and analogue platforms.
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