NASA astronaut Anne McClain installs science hardware

iss059e034463 (April 23, 2019) --- NASA astronaut Anne McClain installs the MVP-2 platform onto Express Rack 4 and took historical photos. The Experimental Evolution of Bacillus subtilis Populations in Space: MVP-02 investigation seeks to understand how organisms adapt to the space environment, an important component of future space exploration. Microbes may play fundamental roles in the development of biologically-based closed-loop regenerative life support, in-situ resource utilization, and will have extensive interactions with human and plant hosts. Further, microbes may pose challenges through virulence and contamination, and as nuisance factors such as biofilms in water supply and ventilation systems.