What are ureides and how it is classified?
Acylureas (also called N-acylureas or ureides) are a class of chemical compounds formally derived from the acylation of urea.
What is a Ureide?
ureide in American English (ˈjʊriˌaɪd ; ˈjʊriɪd ) noun. any of several compounds derived from urea by the replacement of one or more hydrogen atoms by an acid radical. Word origin. urea + -ide.
What are cyclic ureides?
Taken together, cyclic ureides can also be regarded as ring structures that contain an imido function with an adjacent N-atom. We begin our discussion with the five-membered hydantoins, to continue with six-membered structures, namely dihydropyrim-idines, barbituric acids, and xanthines.
What are Ureides in plants?
Evidence indicates that in nodulated legumes ureides are synthesized from products of N2-fixation via purine synthesis and degradation. The use of ureides rather than amides for N-transport from the root to the shoot via the xylem stream results in an improved carbon economy of the plant.
What is urea formula?
CH₄N₂OUrea / Formula
Are barbiturates acidic or basic?
Long-acting barbiturates such as phenobarbital have continued to be used as anticonvulsants and have the least potential for abuse (Table 1). Barbiturates are administered orally or parenterally. As weak acids, they are absorbed rapidly from the stomach and small intestine into the systemic circulation.
How are Ureides formed?
The presence in the nodules of purine nucleosidase and ribokinase activities makes a recirculation of the ribose moiety possible. In concert with phosphoribosylpyrophosphate synthetase, ribose becomes available for a new round of purine de novo synthesis, and thereby ureide formation.
How many types of Ureides are there?
Although the profiles of relative ureide-N of xylem sap and stem segments and %Ndfa (ureide) of all four species in the two Herridge and Peoples (2002b) field studies were relatively uniform, a period of stress, coinciding with the critical R3.
Is urea a fertilizer?
Urea is a source of Nitrogen, an essential nutrient crucial for crop growth and development. Urea is the most important nitrogenous fertilizer in the country because of its high N content (46%N). It also has industrial applications such as the production of plastics and as a nutritional supplement for cattle.
How is urea made?
Urea is now prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide. These two materials are combined under high pressures and elevated temperatures to form ammonium carbamate, which then decomposes at much lower pressures to yield urea and water.