The mechanism of the reaction between carbodiimides and activated α,β-unsaturated carboxylic acids yielding fully substituted hydantoins and variable amounts of N-acyl urea by-products was studied using density functional theory calculations. Two alternative pathways featuring N-acyl ureas and imino-oxazolidinones as intermediates for the formation of the hydantoin product were taken into accou...

The tonoplast-bound H(+)-translocating ATPase from Hevea latex was found to be insensitive to vanadate, diethylstilbestrol, and octylguanidine, which are specific inhibitors of the plasma membrane ATPase. The inhibitors of the mitochondrial ATPase, oligomycin and azide, and also rotenone and antimycin A, were all without effect. In contrast, trimethyltin chloride strongly inhibited the activity...

objective: cell vital function has correlation with mechanical loadings that cell experiences. here, effects of in-vitro combined cyclic-static stretch on proliferation of human mesenchymal stem cell (hmsc) were evaluated. materials and methods: hmscs were cultured on gelatin coated elastic membranes, and exposed to stretch loading. four different regimes of cyclic, static, combined cyclic-sta...

Tin carbodiimides have been reported with various compositions, prepared via solid-state metathesis reactions by heating tin halides and lithium carbodiimide at moderate temperatures. The formations of two new compounds, LiSn2Br3(CN2) Sn4Br2(CN2)3 are monitored differential thermal analysis (DTA), crystal structures as refined on basis X-ray diffraction studies. structure can be described inter...

Ternary carbodiimides, Ba1-xSrxNCN (x ​= ​0, 0.1, 0.2, 0.5, 0.8, and 1.0) were prepared by an ammonolysis reaction with a (Ba,Sr)CO3 precursor obtained polymerized complex method. A new orthorhombic carbodiimide was at x ​0.1. It coexists SrNCN-type solid solutions between ​0.2 0.5. The crystal structure of Ba0.9Sr0.1NCN determined using single-crystal X-ray powder neutron diffraction data, fou...

Finite affine groups are given by groups of translations and di- lations on finite cyclic groups. For cyclic groups of prime order we develop a time-scale (wavelet) analysis and show that for a large class of non-zero window signals/vectors, the generated full cyclic wavelet system constitutes a frame whose canonical dual is a cyclic wavelet frame.

experimental study of the cyclic behavior of unsaturated materials is more complex than that of the saturated materials due to the required equipment, experience and time. furthering investigations in the field of unsaturated materials is necessary to better understand its complexity and sensitivity of unsaturated cyclic parameters to different determinants such as suction path, stress path, lo...