Such pollutants include sediment, nutrients, bacteria, pesticides, metals, and petroleum byproducts. Incomplete combustion of petroleum or gasoline results in production of toxic byproducts. Microbial colonies also excrete many different types of waste byproducts. These are mainly polymers synthesized from petroleum byproducts. These gases result from electrical consumption of the smelters and the byproducts of processing. One of the main industrial byproducts of ammonia production is CO. This compound is metabolized by the body into several chemical byproducts including phenylalanine. These regulations require that livestock are fed certified organic food that contains no animal byproducts. It also does not readily form THMs or haloacetic acids (disinfection byproducts). The reaction had an overall efficiency exceeding 90% with no harmful byproducts. The organisms colonize the keratin tissues causing inflammation as the host responds to metabolic byproducts. The increase in cellular metabolism causes the increase in vasoactive metabolic byproducts. Nitrocellulose deteriorates with time, yielding acidic byproducts. They further reported measuring small amounts of nuclear reaction byproducts, including neutrons and tritium. Betaine can be isolated from the byproducts of sugar beet processing.