Sound production in Japanese medaka (Oryzias latipes) and its alteration by exposure to aldicarb and copper sulfate.

This study is the first to report sound production in Japanese medaka (Oryzias latipes). Sound production was affected by exposure to the carbamate insecticide (aldicarb) and heavy-metal compound (copper sulfate). Medaka were exposed at four concentrations (aldicarb: 0, 0.

The application of entropy for detecting behavioral responses in Japanese medaka (Oryzias latipes) exposed to different toxicants.

Growing concern over environmental pollution by chemicals that may directly or indirectly impact human and ecosystem health make it increasingly necessary to establish a biological early warning system to minimize these impacts. To achieve this, simple and reliable approaches and criteria for environmental risk assessment must be developed. We propose a new approach for detecting behavioral responses to toxicants in flowing water.

Effect of trans-4-guanidinomethylcyclohexanecarboxylic acid 4-tert-butylphenyl ester, a trypsin inhibitor, on the growth of various strains of Escherichia coli.

Similarly to Escherichia coli K-12 IAM 1264, trans-4- guanidinomethylcyclohexanecarboxylic acid 4-tert-butylphenyl ester (GMCHA-OPhtBu), a trypsin inhibitor, had a strong inhibitory effect on the growth of various strains of E. coli K-12, such as W 3350, AB 1157, JM 103, W 3110, C 600r-m- and C 600r+m+, preceded by suppressive effects of GMCHA-OPhtBu on DNA synthesis in these strains, although the inhibitory effects varied from strain to strain. These results suggested the possible involvement of a trypsin-like proteinase in DNA synthesis.