“…(1972), Troyer (1974), McGrath et al (1975), Qkamoto et al (1975, Valcic (1975), Hildebrandt & Cocks (1976, Reid (1978), Mersey et al (1978, Morris & McGrath (1980), Reid et al (1980 and Reisman & Friedman (1981). This type of instrumentation has been applied to the study of a large spectrum of biological tissues, including plant cells (Geneves, 1955), unfertilized eggs (Sherman & Lin, 1958), bone marrow cells (Richards & Persidsky, 1961), erythrocytes (Kozlov & Teodorovich, 1966;Kuivenhoven, 1966;Rinfret, 1968;Diller et al, 1972;Diller, 1975Diller, , 1979, kidney tissue (Sherman, 1969;Diller & Schmitt, 1981), protozoa (Bychenkova et al, 1969), nematodes (LozinaLozinskii & Namatov, 1971), HeLa cells (McGrath et al., 1975), mouse ova (Leibo et al 1978), Chinese hamster ovary cells (Griffiths et al, 1979) and liposomes (Morris & McGrath, 1981).…”