Rickets caused by deficiency of vitamin D has almost disappeared in Great Britain, and for this reason attention is being focused more and more on the group of conditions which in the past has been loosely termed ‘ ‘ resistant ‘ ‘ and ‘ ‘ renal ‘ ‘ rickets. Dent (1952) clarified the confusion that has surrounded the subject. He classified the etiolog ’ of the various rachitic and osteomalacic c...

The high energy Operator Product Expansion for the product of two electromagnetic currents is extended to sub-eikonal level in a rigorous way. I calculate impact factors polarized and unpolarized structure functions, define new distribution derive evolution equations functions flavor singlet non-singlet case.

We report the growth by ion exchange synthesis of ZnS nanoparticles in MCM-41 matrices using Zn (CH3COO)2 and Na2S starting sources. The final product (ZnS/MCM-41) was characterized by X-ray diffraction (XRD) pattern, transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectrometry (IR) and UV-vis spectroscopy. Its crystalline st...

In this paper, we introduce a concept of B-minimal sub-manifolds and discuss the stability of such a sub-manifold in a Riemannian manifold (M, g). Assume B(x) is a smooth function on M . By definition, we call a sub-manifold Σ B-minimal in (M, g) if the product sub-manifold Σ × S1 is a minimal sub-manifold in a warped product Riemannian manifold (M×S1, g+ e2B(x)dt2), so its stability is closely...

In this article, recyclable Fe3O4@SiO2@FeCl3 was synthesized and entirely characterized by various techniques including XRD, FT-IR, SEM, EDX and VSM analysis. The catalytic ability of produced Fe3O4@SiO2@FeCl3 was studied in the aza-Michael reaction of diethyl amine and ethyl crotonate which lead to high yie...