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 the role of ureides?

Ultimately, the N is released from ureides in sink tissues and used for synthesis of amino acids essential for physiological functions, and growth and development of sink organs (Coker and Schaefer, 1985; Todd et al., 2006).

What are ureides in chemistry?

ureide. / (ˈjʊərɪˌaɪd) / noun chem. any of a class of organic compounds derived from urea by replacing one or more of its hydrogen atoms by organic groups.

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.

What is made by the plants using amino acid?

Glycine and Glutamic Acid are fundamental metabolites in the process of formation of vegetable tissue and chlorophyll synthesis. These Amino Acids help to increase chlorophyll concentration in the plant leading to higher degree of photosynthesis.

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.

Is urea a urine?

Urea (also known as carbamide) is a waste product of many living organisms, and is the major organic component of human urine. This is because it is at the end of chain of reactions which break down the amino acids that make up proteins.

What is amide formula?

Amide groups have the general chemical formula CO-NH. They may be produced by the interaction of an amine (NH2) group and a carboxyl (CO2H) group, or they may be formed by the polymerization of amino acids or amino-acid derivatives (whose molecules contain both…

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.

Is classified under Class Acylureas?

Insecticides. A subclass of acylureas known as benzoylureas are insecticides. They act as insect growth regulators by inhibiting the synthesis of chitin resulting in weakened cuticles and preventing molting. Members of this class include diflubenzuron, flufenoxuron, hexaflumuron, lufenuron, and teflubenzuron.

What is an NH group called?

The simple -NH substituent found in 1º-amines is called an amino group.

What is the difference between an amide and an amine?

Compounds containing a nitrogen atom bonded in a hydrocarbon framework are classified as amines. Compounds that have a nitrogen atom bonded to one side of a carbonyl group are classified as amides.

What are the derivatives of amides?

The simplest amides are derivatives of ammonia (NH3) in which one hydrogen atom has been replaced by an acyl group. Closely related and even more numerous are amides derived from primary amines (R′NH2) with the formula RC(O)NHR′.

What is imide group?

In organic chemistry, an imide is a functional group consisting of two acyl groups bound to nitrogen. … Inorganic imides are also known as solid state or gaseous compounds, and the imido group (=NH) can also act as a ligand.

What is an SH group called?

By itself the -SH group is called a mercapto group. Thiols are usually prepared by using the hydrosulfide anion (-SH) as a neucleophile in an SN2 reaction with alkyl halides.

What is COOH group called?

The carboxyl (COOH) group is so-named because of the carbonyl group (C=O) and hydroxyl group. The chief chemical characteristic of the carboxylic acids is their acidity.

What is difference between amide and imide?

The key difference between imide and amide is that imide is an organic compound composed of two acyl groups bonded to the same nitrogen atom whereas amide is an organic compound composed of an acyl group bonded to a nitrogen atom.

What is anhydride group?

Anhydride (acid anhydride): A functional group characterized by two acyl groups joined by an oxygen atom. When the R groups in the general structure shown below are not the same (i.e., when the anhydride is derived from two different carboxylic acids) it is called a mixed anhydride.