Request for tender. A request for tenders (RFT) is a formal, structured invitation to suppliers to submit a bid to supply products or services.
Altogether 786 isolates from time interval 2008-2010 were grouped into 90 PCR ribotypes and eleven of them were shared among all host types and the environment. Ribotypes that were most common in humans were also present in water and different animals (014/020, 002, 029). Interestingly, non-toxigenic isolates were very common in the environment (30.8%) in comparison to humans (6.5%) and animals (7.7%). A high degree of similarity was observed for human and animal isolates with PFGE.
Categories of Pollution: Nonpoint Source. Nonpoint source pollution is difficult to control because it comes from many different sources and locations. Motor oil and other oil-based chemicals can be recognized by a characteristic rainbow-colored sheen. Click on image for larger view. Most nonpoint source pollution occurs as a result of runoff. When rain or melted snow moves over and through the ground, the water absorbs and assimilates any pollutants it comes into contact with (USEPA, 2004b).