| impact of an urban effluent on the bacterial community structure in the arga river (spain), with special reference to culturable gram-negative rods. | the arga river is an interesting system in which to study the impact of urban effluent pollution because it receives a single effluent in the form of wastewater discharge from the city of pamplona. to analyze the extent of this discharge, total bacteria, culturable heterotrophic bacteria, and gram-negative heterotrophic bacteria were enumerated and 409 isolates of the latter were identified. one sampling station was located upstream from the inflow, while five were located up to 30 km downstream ... | 1999 | 10907419 |