A glaring mistake below: > Within the roots, toxic ammonia is converted to amides or > ureides prior to entering the vascular system of the plant where it is > moved up into the shoots where it is again converted to amino acids or > to ammonia to build simple sugars, complex proteins or finally into > cellulose & lignin, the structural building material of > plants. Nitrogen is not a component of simple sugars although its a key ingredient of all proteins & is involved in virtually all biochemical activities as a constituent of enzymes. Please excuse the simplification. Steve ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/