00281nam a2200121Ia 4500008004100000082001900041100000900060245001700069250000800086260003800094300001000132650001700142150201s1990    xx            000 0 und d  a616.01bM1990G  aGURU  aMICROBIOLOGY  a1ST  bN.C.R.T. PUBLICATIONaDELHIc1990  a1-158  aMICROBIOLOGY