Carboxyl groups have an electronegative oxygen atom double bonded to a carbon atom. This carbon-oxygen bond is very polar and the fact that its a double bond increases the polarity of the bond.
PEA agar, also referred to as Phenylethyl Alcohol Agar is a medium  used by microbiologists to grow microorganisms. The ingredient that  supplies nitrogen is casein. Making the world better, one answer at a time.
Milorganite 36 lb. Organic Nitrogen Fertilizer is good for promoting healthy growth of lawns, trees, shrubs and flowers. The non burning formula doesn't have to be watered-in. It is fortified with 4% iron to help produce thick, green lawns without excessive growth. It doesn't contain any salts, so it is good for use in drought conditions. 1  Use on lawns, trees, shrubs and flowers to promote healthy growth.  36 lb. bag covers 2,500 sq. ft. to feed your lawn or garden from corner to corner.