Vinyl chloride, chloromethane and the banned pesticide DDT are examples of chlorinated hydrocarbons. Chlorinated hydrocarbons are organic molecules wherein chlorine has been substituted for some of...
Resident flora of certain areas plays a definite role in maintaining health and. normal function. Members of the resident flora in the intestinal tract synthesize. vitamin K and aid in the absorption of nutrients. On mucous membranes and. skin, the resident flora may prevent colonization by pathogens and possible. disease through âbacterial interference.â The mechanism of bacterial interference. is not clear.
Second, normal flora can locally exhaust micronutrients that pathogenic (disease-causing) bacteria need for metabolism, thereby inhibiting the growth of these invaders if they do enter the body. Third, byproducts produced by these normal flora can also make the local environment inhospitable for some species of pathogenic bacteria.