Cyanobacterial hybrid kinase Sll0043 regulates phototaxis by suppressing pilin and twitching motility protein.

The unicellular cyanobacterium Synechocystis sp. PCC 6803 glides toward a light source through the interplay of positive phototaxis genes and proteins. In genetic analysis, the complete disruption of the hybrid sensory kinase sll0043 produced negative phototaxis.

Effect of 2,3,7,8-tetrachlorodibenzo-p-dioxin on testicular spermatogenesis-related panels and serum sex hormone levels in rats.

Objectives: To determine the detrimental role of tetrachlorodibenzo-p-dioxin (TCDD) in testicular histology, spermatogenesis-related panels and proteome, and serum sex hormone levels.

Materials And Methods: In all, 40 male rats were divided into equal groups: a normal control (NC) group that received vehicle and saline, and a TCDD-treated (TT) group injected intraperitoneally with TCDD (one dose, 50 microg/kg body weight). The rats were killed 4 weeks after TCDD exposure and testicular weight, histopathology, proteome and variables related to spermatogenesis, and serum sex hormone levels were investigated.