The absorption, translocation, and assimilation of urea, nitrate, and ammonium in tomato plants within 24 h after N labeled compounds were applied at four different growth stages: seedling, ̄owering, fruiting, and harvesting. The absorption of urea-N was only 25% of NO3-N at seedling stage, but it was up to about 80% of NO3-N at the subsequent growth stages. The translocation of urea-N was limit...

urea synthesised in the body.2 The discrepancy could result not only from the hydrolysis of urea in the gut but also from excretion of urea in the skin. A significant proportion of N released from hydrolysis of urea in the gut is also known to be recycled into urea or excreted as ammonia in the breath. In healthy adults with a normal protein intake about 20% of synthesised urea is not excreted ...

Abstract We report the application of Pd(II)-catalyzed, directing-group-aided C–H arylation/alkylation tactics to functionalize pyrene core, especially, relatively inaccessible C2 and K-region C10 positions core augmentation library derivatives with C1,C2- C1,C10-disubstituted motifs. The Pd(II)-catalyzed β-C–H C2-position pyrene-1-carboxamide possessing an 8-aminoquinoline directing group yiel...

The data shown in this article are related to the subject of an article in Carbohydrate Polymers, entitled "Synthesis and characterization of chitosan alkyl urea" [1]. 1H NMR and 13C NMR spectra of chitosan n-octyl urea, chitosan n-dodecyl urea and chitosan cyclohexyl urea are displayed. The chemical shifts of proton and carbon of glucose skeleton in these chitosan derivatives are designated in...

Recent results in the chemistry of disubstituted carbenium ions (vinyl cations and phenyl cations) are described separately under three different sections: From kinetic and solvolytic data of several 1—cyclobutenyl nonaflates, the intermediacy of a non-classical vinyl cation, namely the 1-cyclobutenyl cation 2 is established. Cycloaddition reactions of solvolytically generated vinyl cations wit...

Results of the dielectric relaxation studies, performed for supramolecular polymer formed by N, N ′-di(2,2-dipentylheptyl)urea dissolved in carbon tetrachloride, are presented. The measurements were done for N, N ′-di(2,2-dipentylheptyl)urea concentration up to about 7% (in mole fraction) in the frequency region from 100 kHz to 100 MHz and at the temperatures from 5◦C to 50◦C. The analysis of t...