Ureide

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Ureide

 

(also known as ureid), any of the derivatives of urea [CO(NH2)2] resulting from the substitution of acyl (RCO) radicals for hydrogen atoms in the NH2 groups. Ureides are crystalline, high-melting compounds; the melting point of acetylurea (CH3CONHCONH2) is 218°C, while that of diacetylurea (CH3CONH)2CO is 153°C. Cyclic ureides are obtained from the reaction of urea with dibasic acids; for example, barbituric acid is obtained by reacting urea with malonic acid or malonic ester. The ureides of brome-substituted acids (bromisoval, carbromal) and cyclic ureides of the barbiturate type are used as sedatives.

References in periodicals archive ?
Although ureides were significantly reduced in the PlusN treatment of both the irrigated and nonirrigated environments, N concentration was not significantly different between N treatments in the irrigated environment (3.
Sinclair and Serraj (1995) reported that warm-season species that accumulated high concentrations of ureides (>200 mmol [L.
Other nonnodulating genotypes have subsequently been isolated and one study showed that, in fact, the nonnodulating mutants contained much lower concentration of ureide in developing pods (Matsumoto et al.
The accumulation of ureides in response to drought has been noted in previous reports (de Silva et al.
2] fixation, and increased leaf ureides would reflect decreased breakdown due to leaf asparagine accumulation.
It is unknown whether soybean germplasm exist that does not transport ureides like those of grain legume species with [N.
Ureides and amides as N sources for soybean seed growth and maturation in vitro.
The rapid decrease in ARA in response to allantoin indicates the inhibitory nature of ureides on nodule activity.
On Day 14 of the treatment period, the +Mn treatment for KS4895 had a greater concentration of petiole ureides than the -Mn treatment of KS4895 or either Mn treatment for Jackson.
Role of amides, amino acids, and ureides, in the nutrition of developing soybean seeds.