Thirty four arsenic resistant bacterial strains were isolated from the soil samples of Khulna Shipyard. They by growing them on nutrient broth medium containing 5 mgl-1 arsenic. From them, five finally selected, and studied their morphological, biochemical ecological characters in details. identified as Bacillus lichenifomis, polymyxa, Listeria murrayi, Moraxella urethralis Planococcus citreus....

this study was accomplished to examine the efficiency of natural zeolite in preventing acute toxicity of total ammonia to huso huso. the study was performed using water static method in 96 hours. fish averaged 46 ? 5 g in weight and 22 ? 4 cm in total length were exposed to four different concentrations (15, 30, 50, 75 mgl-1) of ammonia and a group was considered as control. under stable condit...

The piscicidal potential of water-extract mesocarp of Azadirachta indica (L) was studied in static bioassay experiment with continuous aeration to determine its acute toxicity The mortality rate and opercular ventilation under laboratory conditions over 96 hr exposure were monitored. The 96 hrLC50 was 81.28 mgl(-1) while the threshold value was 21.13 mgl(-1). The fish exhibited respiratory dist...

humic acid as an organic substance can bound heavy metals. it is a best way of decreasing the hazardous effect of heavy metals on plants and thereby on humans. a factorial experiment was conducted in a completely randomized design of seven replications. the treatments consisted of three cadmium levels (0, 2 and 4 mgl-1), and three humic acid levels (0, 100, 1000 mgl-1) added to nutrient solutio...

abstract the present research was conducted in a commercial orchard of pistachio during 2006-2007 in rafsanjan, iran. gibberellic acid (ga3) were applied at 0, 25, 50 and 75 mgl-1 and at three time of spray (the first of june, july and august) on “ahmad-aghai” pistachio cultivar. two branches of each tree was sprayed during two years of study. spraying at june had least of early splitting. ga3 ...