1Charles E. King MD,John Leibach MD,Dr. Phillip P. Toskes MD. Clinically significant vitamin B12 deficiency secondary to malabsorption of protein-bound vitamin B12[J] 1979,Digestive Diseases and Sciences(5):397～402
7Quesada-Chanto A, Afschar AS, Wagner F. Microbial production of propionic acid and vitamin B12 using molasses or sugar. Appl Mivrobiol Biotechnol, 1994, 41(4) 378-383.
8Miyano KI, Ye KM, Shimizu K. Improvement of vitamin B12 fermentation by reducing the inhibitory metabolites by cell recycle system and a mixed culture. Biochemical Engineering Journal, 2000, 6(3): 207-214.
9Sattler I, Roessner CA, Stolowich NJ, Hardin SH, Harris-hailer LW, Yokubaitis NT, Murooka Y, Hashimoto Y, Scott AI. Cloning, sequencing, and expression of the uroporphyrinogen Ⅲ methyltransferase cobA gene of Propionibacterium freudenreichii (shermanii). Journal of Bacteriology, 1995, 177(6): 1564-1569.
10Kiatpapan P, Hashimoto Y, Nakamura H, Piao YZ, Ono H, Yamashita M, Murooka Y. Characterization of pRGO1, a plasmid from Propionibacterium acidipropionici, and its use for development of a host-vector system in propionibacteria. Appl Environ Microbiol, 2000, 66(11): 4688-4695.
