. . . . . . . . . . "1985" . . . . "1915" . . . . "1985-04-15" . . . . . . . . "Sambhu Nath De" . . . "Dr. S. N. Dey and cholera toxin" . . . . . . "Sambhu Nath De" . "\u09B6\u09AE\u09CD\u09AD\u09C1\u09A8\u09BE\u09A5 \u09A6\u09C7" . . . . . . . . . . . . . "1915-02-01" . . .