Here is an article about experiments with

Pseudomonas aeruginosa in space.

http://phys.org/news/2013-11-bacteria-zero-gravity-nutrient-environment.html

Regards,

Joachim

What does gravity do here? Is it that lack of gravity allows efficient utilization of nutrients as less energy is required to counter-balance gravity? Lack of gravity may also help in better in take of nutrients which may be small quantities which may be hindered on Earth.