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.
Additionally, the presence of skin abrasions and cuts that allow normal flora to cross the epithelial cell barrier, or a condition which causes the host to be immunocompromised, can result in disease caused by the normal flora. However, these are relatively rare events, and typically our normal flora do much more good than harm to our bodies. Normal flora versus âpathogenicâ bacteriaâhow do we distinguish between them? A problem arises, though, when what may be ânormal floraâ to one individual is a cause of severe disease in others.