conclusions bacteria from biological waste were competent producers of pg and must be used on an industrial scale to cope with the demand of pg in the food industry. results among the bacillus, bacillus vallismortis (jq990307) isolated from mango was the most competent producer of pg; producing up to 4.4 u/µl. amongst pseudomonas, pseudomonas aeruginosa (jq990314) isolated from oranges was the ...

Histochemical studies of enzyme activities and structural elements in Gyrodactylus derjavini Mikailov, 1975 parasitizing fins of Oncorhynchus mykiss Walbaum were conducted. Marked activities of non-specific esterase, acid phosphatase, alkaline phosphatase and amino-peptidase were found in the intestinal caeca of the parasite. A strong activity of acetylcholinesterase was seen in the nervous sys...

Las granjas pequeñas de tilapia contribuyen al desarrollo rural sostenible; sin embargo, los parásitos pueden afectar su productividad. El presente estudio determinó la prevalencia e intensidad tricodínidos y monogéneos en Guerrero, Oaxaca Chiapas. Se identificaron seis especies tricodínidos: Trichodina centrostrigeata, T. compacta, heterodentata, magna, nigra sp.; nueve monogéneos: Cichlidogyr...

Assessment of potential risks of complex contaminant mixtures in the environment requires integrated chemical and biological approaches. In support of the US Great Lakes Restoration Initiative, the US Environmental Protection Agency lab in Duluth, MN, is developing these types of methods for assessing possible risks of aquatic contaminants in near-shore Great Lakes (USA) sites. One component in...

The fathead minnow (Pimephales promelas) is a nest-building North American cyprinid that spawns multiply and exhibits exclusive male parental care. Here, we examined the effects of nest substrate availability on the genetic mating system in 2 natural populations from the glacial pothole region of eastern South Dakota. The sites differed dramatically with respect to the type and density of avail...