Two Position Screw-Cap Culture Tubes

Disposable two position screw-cap culture tubes are widely used in laboratories for microbial cultivation, cell suspension culture, and sample preservation. The cap features a dual-position structure that allows adjustment of tightness by rotation.When the dual-position PE cap is loosened, gas exchange is permitted, making the tube suitable for aerobic cultivation of microorganisms such as Escherichia coli, yeast, Mycobacterium tuberculosis, and Pseudomonas aeruginosa.When the dual-position PE cap is fully tightened, a sealed environment is formed, suitable for anaerobic cultivation of microorganisms such as Bacteroides and Bifidobacterium species, or for short-term storage (1–3 days) of microbial cultures at 4 ° C.