Homology modeling and molecular dynamics simulation of a novel beta-galactosidase antarctic psychrophilic bacterium planococcus antarcticus dsm 14505 by Omar, Mohd. Shahir Shamsir, Ibrahim, Ammar, Mohd. Noor, Mohd. Redhuan, Mahmoud, Azzam Aladdin, Ramli, Muhammad Faidhi, Bouna, Ahmed