| 435 / | HD | CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY |
| 262 | DF | PROCESS OF UTILIZING AN ENZYME OR MICRO-ORGANISM TO DESTROY HAZARDOUS OR TOXIC WASTE, LIBERATE, SEPARATE, OR PURIFY A PREEXISTING COMPOUND OR COMPOSITION THEREFORE; CLEANING OBJECTS OR TEXTILES {8} |
| 267 | DF | .~ Treating animal or plant material or micro-organism {6} |
| 272 | DF | .~.~ Proteinaceous material recovered or purified {1} |
| 273 | | .~.~.~ Collagen or gelatin |