Open AccessSeparation of active and inactive fractions from starved culture of Vibrio parahaemolyticus by density dependent cell sorting
Author(s) -
Nayak Binaya Bhusan,
Kamiya Eriko,
Nishino Tomohiko,
Wada Minoru,
Nishimura Masahiko,
Kogure Kazuhiro
Publication year - 2005
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1016/j.femsec.2004.08.005
Subject(s) - percoll , biology , vibrio parahaemolyticus , density gradient , cell , microbiology and biotechnology , cell sorting , cell culture , differential centrifugation , vibrio , centrifugation , bacteria , biochemistry , genetics , physics , quantum mechanics
The co‐existence of physiologically different cells in bacterial cultures is a general phenomenon. We have examined the applicability of the density dependent cell sorting (DDCS) method to separate subpopulations from a long‐term starvation culture of Vibrio parahaemolyticus . The cells were subjected to Percoll density gradient and separated into 12 fractions of different buoyant densities, followed by measuring the cell numbers, culturability, respiratory activity and leucine incorporation activity. While more than 78% of cells were in lighter fractions, about 95% of culturable cells were present in heavier fractions. The high‐density subpopulations also had high proportion of cells capable of forming formazan granules. Although this was accompanied by the cell specific INT‐reduction rate, both leucine incorporation rates and INT‐reduction rates per cell had a peak at mid‐density fraction. The present results indicated that DDCS could be used to separate subpopulations of different physiological conditions.