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.
The Chemical Fertility of Soils: Soil Nutrients and Plant Nutrition. 1  There are a number of element nutrients that are essential for plant growth.  Carbon, hydrogen and oxygen, three of the essential plant nutrients, are taken up from the atmosphere and from water. The other essential nutrients come from the soil.