Antibiotics have various residence times with the human body. Some are designed be highly soluble and pass through quickly whilst others have a longer residence time. This is …related to the chemical structure of the anti biotic..
The risk of addition to of anti biotics to two fold. Firstly continual unnecessary addition of antibiotics only serves to increase the chance of mutation for anti biotic resistant bacteria which can only serve to increase chance of a strain which effects humans and is difficult to treat with current antibiotics. Secondly as shown The New England Journal of Medicine (10/18/01) residence of these chemicals within the meat (which is then consumed) and other chemicals with unknown synergistic effects. This may (unproven) have the potential to accumulate in human muscle with unknown effects. (MORE)
"Cellulosic" means that the material contains cellulose. Cellulose is found in wood, paper, grass and other plant matter. If it is used as a starting point for producing somet…hing, such as ethanol, that would make it a feedstock. (MORE)
Naphtha often provides feedstock to the petrochemical industry. This is especially true in countries in which the vehicle fleet is centered on diesel fuel (such as European co…untries). The United States has historically had a vehicle fleet balanced between gasoline and diesel fuels, resulting in the maximization of naphtha blended into the motor fuels pool. Therefore, most of the petrochemicals in the U.S. are produced by turning natural gas into ethylene. As of 2012 the U.S. is undergoing a slight dieselisation of its vehicle fleet; however, natural gas prices at 10 year lows continue to make natural gas the most cost effective route for producing petrochemicals in the U.S. (MORE)