BIOMEX (BIOlogy and Mars EXperiment) is an ESA/Roscosmos space exposure experiment housed within the exposure facility EXPOSE-R2 outside the Zvezda module on the International Space Station (ISS). The design of the multiuser facility supports—among others—the BIOMEX investigations into the stability and level of degradation of space-exposed biosignatures such as pigments, secondary metabolites, and cell surfaces in contact with a terrestrial and Mars analog mineral environment. In parallel, analysis on the viability of the investigated organisms has provided relevant data for evaluation of the habitability of Mars, for the limits of life, and for the likelihood of an interplanetary transfer of life (theory of lithopanspermia). In this project, lichens, archaea, bacteria, cyanobacteria, snow/permafrost algae, meristematic black fungi, and bryophytes from alpine and polar habitats were embedded, grown, and cultured on a mixture of martian and lunar regolith analogs or other terrestrial minerals. The organisms and regolith analogs and terrestrial mineral mixtures were then exposed to space and to simulated Mars-like conditions by way of the EXPOSE-R2 facility. In this special issue, we present the first set of data obtained in reference to our investigation into the habitability of Mars and limits of life. This project was initiated and implemented by the BIOMEX group, an international and interdisciplinary consortium of 30 institutes in 12 countries on 3 continents. Preflight tests for sample selection, results from ground-based simulation experiments, and the space experiments themselves are presented and include a complete overview of the scientific processes required for this space experiment and postflight analysis. The presented BIOMEX concept could be scaled up to future exposure experiments on the Moon and will serve as a pretest in low Earth orbit.
Causes of behavior are often classified as either dispositional (e.g., personality) or situational (e.g., circumstances). However, the disposition–situation dichotomy confounds locus (internal vs. external) and stability (unstable vs. stable) of attribution, rendering it unclear whether locus or stability drives changes in dispositionality. In the present research, we examine the dispositional shift—that is, psychologically distant (vs. near) events are attributed to dispositional (vs. situational) causes. Using construal level theory, we hypothesize that the dispositional shift is caused by a change in stability (but not necessarily locus) of attribution. Two experiments support this hypothesis. In Experiment 1, distant (vs. near) future events were attributed to more stable causes. In Experiment 2, actions by a socially distant person (vs. oneself) were also attributed to more stable (but also more internal) causes. Thus, important psychological manipulations, here psychological distance, can influence causal dimensions selectively, supporting the independence of stability and locus of attribution.
As a part of the European Space Agency mission ''EXPOSE-R2'' on the International Space Station (ISS), the BIOMEX (BIOlogy and Mars EXperiment) investigates the habitability of Mars and the limits of life. In preparation for the mission, experimental verification tests and scientific verification tests simulating different combinations of abiotic space and Mars-like conditions were performed to analyze the resistance of a range of model organisms. The simulated abiotic space-and Mars-stressors were extreme temperatures, vacuum, and Mars-like surface ultraviolet (UV) irradiation in different atmospheres. We present for the first time simulated space exposure data of mosses using plantlets of the bryophyte genus Grimmia, which is adapted to high altitudinal extreme abiotic conditions at the Swiss Alps. Our preflight tests showed that severe UVR 200-400nm irradiation with the maximal dose of 5 and 6.8 · 10 5 kJ$m -2 , respectively, was the only stressor with a negative impact on the vitality with a 37% (terrestrial atmosphere) or 36% reduction (space-and Mars-like atmospheres) in photosynthetic activity. With every exposure to UVR 200-400nm 10 5 kJ$m -2 , the vitality of the bryophytes dropped by 6%. No effect was found, however, by any other stressor. As the mosses were still vital after doses of ultraviolet radiation (UVR) expected during the EXPOSE-R2 mission on ISS, we show that this earliest extant lineage of land plants is highly resistant to extreme abiotic conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.