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.
Inoculating Your Field Peas. One of the most important inputs for any pulse crop is inoculant, and several input suppliers offer field pea inoculants in a variety of formulations.roper inoculation for field peas will reduce â or remove â your need to apply nitrogen fertilizer and will help get your crop get off to a good start. Field pea inoculants come in three formulations: