1. Feeding behavior of Didinium nasutum on Paramecium bursaria with normal or apochlorotic zoochlorellae;Berger;J. gen. Microbiol.,1980
2. Effects of chlorinated coliforms on protozoan population growth;Berk;J. Water Pollut. Control Fed.,1981
3. Ciliates as a food source for marine planktonic copepods;Berk;Microbial Ecol.,1977
4. Effects of ingesting mercury-containing bacteria on mercury tolerance and growth rates of ciliates;Berk;Microbial Ecol.,1978
5. A strategy for use of protozoans in the evaluation of hazardous substances;Cairns,1979