One of the unsolved enigmas of Ewing’s sarcoma family of tumors (ESFT) is its histogenetic origin. Lately, evidence has been accumulating that boneor bone marrow–derived mesenchymal progenitor cells (MPC) can be transformed by EWS-FLI1 causing small-round cell-like tumors in mice. This observation was extended recently in a report by Riggi et al. (1). Riggi et al. (1) report that EWS-FLI1 is ca...

The electronic, optical, and lattice dynamical properties of tetracalcium trialuminate (Ca₄Al₆O13) with a special sodalite cage structure were calculated based on the density functional theory. Theoretical results show that Ca₄Al₆O13 is ductile and weakly anisotropic. The calculated Young's modulus and Poisson ratio are 34.18 GPa and 0.32, respectively. Ca₄Al₆O13 is an indirect-gap semiconducto...

In this paper we present the structure and describe serological properties of the O-specific polysaccharide of Proteus mirabilis O13 lipopolysaccharide, which contains a unique component: an amide of D-galacturonic acid (D-GalA) with an unusual amino acid, Nepsilon-[(R)-1-carboxyethyl]-L-lysine (alaninolysine, AlaLys). Selective chemical degradations of either GalA or AlaLys resulted in the los...

The unique feature of some Proteus O-polysaccharides is occurrence of an amide of galacturonic acid with N(ε)-[(S/R)-1-Carboxyethyl]-L-lysine, GalA6(2S,8S/R-AlaLys). The results of the serological studies presented here, with reference to known O-antigens structures suggest that GalA6(2S,8S/R-AlaLys) or 2S,8R-AlaLys contribute to cross-reactions of O13 Proteus antisera, and Proteeae LPSs. It wa...

This paper studies how land reform and population growth affect land inequality, incorporating indirect effects owing to their influence on household divisions and land market transactions. An intra-household model of joint production explains how divisions and land transactions emerge to avoid inefficient free-riding, and how they are affected by land reform and growth in household size. These...

We report the development and evaluation of a Salmonella O-group-specific Bio-Plex assay to detect the six most common serogroups in the United States (B, C(1), C(2), D, E, and O13) plus serotype Paratyphi A. The assay is based on rfb gene targets directly involved in O-antigen biosynthesis; it can be completed 45 min post-PCR amplification. The assay correctly and specifically identified 362 o...

Trade and Migration with Renewable Natural Resources: Out-of-Steady-State Dynamics Commodity price increases associated with the entry of China, India and other countries into the world economy has led to increased pressure on common-property renewable natural resources (NR). The problem is particularly worrisome for economies that obtain a large share of their income from the exploitation of N...

life in the modern world means existing with the evolving face of modern warfare and global terrorism. we have disasters both man-made disasters, natural. man has devised weapons of mass destruction, which in the hands urban terrorists can cause blasts, building collapses. resulting in a unique pattern of damage to the human body namely, crush injuries “crush syndrome” first recorded in bombing...