GAS VACUOLES · Gas vacuole, a structure that provides buoyancy to some aquatic Prokaryotes. · Gas vacuoles are present in many Photosynthetic bacteria and a few other Aquatic prokaryotes such as Halobacterium (a salt-loving archaeon) and Thiothrix (a filamentous bacterium). GAS VESICLES · Gas vacuoles are aggregates of enormous numbers of Small, Hollow, Cylindrical or Conical shaped structures called Gas vesicles. · Gas vesicles in different species vary in length from about 300 to more than 1000 nm and in width from 45 to 120 nm. · Gas vesicles may number from a few to hundreds per cell. · Gas vesicle walls are composed entirely of two small Protein sub-units (Major protein – Gvp A and Minor protein – Gvp C). These protein sub-units assemble to ...