Phenotypes of Saccharomyces cerevisiae and Rhodotorula rubra exposed to spe
cific parameters of space flight, which were measured both quantitatively a
nd qualitatively, produced variations in pseudohyphal formation. Both the l
ength of the parent and branch pseudohyphal filaments varied according to s
pecific wavelengths and energy levels of UV light exposures when phenotypic
isolates were compared with the parent or ground control isolate of each y
east species.