Structure of O-specific polysaccharide from Proteus mirabilis O10, containing a new component of O-antigens--L-altruronic acid

An acidic O-specific polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Proteus mirabilis O10 and studied after full acid hydrolysis and carboxyl reduction by 1H- and 13C-NMR spectroscopy, including two-dimensional correlation spectroscopy (COSY), H-detected heteronuclear 1H,13C multi-quantum coherence (HMQC), and rotating-frame nuclear Overhauser effect spectroscopy (ROESY). It was found that the polysaccharide contains 2-acetamido-2-deoxy-D-glucose, 2-acetamido-2-deoxy-D-galactose, D-galacturonic acid, and L-altruronic acid, and the following structure of the branched tetrasaccharide repeating unit of the polysaccharide was established: [sequence: see text]     

Structural Wear-Resistant Sintered Materials Based on Titanium

A principle is proposed for increasing the wear resistance of structural titanium materials by addition (together with a moderate number of hard inclusions) of alloying elements which, without decreasing the strength and ductility of titanium, increase the wear resistance of the material thanks to the formation of oxide films during friction that prevent seizing of the contacting surfaces. Requirements for the hard inclusions and alloying additions were defined, the basic of which is a high affinity of the alloying elements for oxygen. Grades of wear-resistant structural titanium materials were created and recommended for use in the production of components operating in friction units at room temperature (IT20, IT15V) and at 250-550°C (IT16M). The mechanical properties and operating conditions (sliding rate, pressure, temperature, counterbody material, atmosphere) of the sintered titanium materials were investigated.     

Don't pull punches.

Comments on C. A. Kiesler's (1977) editorial on the training of psychiatrists and psychologists, charging that the editorial was a tenuous rebuttal to the American Psychiatric Association. The entire psychological community must stand together against this powerful group of psychiatrists, and leaders of the psychologists should present a forceful defense of the survival and legitimacy of psychology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Use of damping materials for increasing the quality and service properties of parts

Conclusion Type 04Kh11Yu chromium-aluminum steels are promising high-damping materials. They contain readily available alloy elements and are more corrosion- and scale-resistant than such high-damping alloys as magnesium and manganese-copper alloys and cast irons. In addition, they are more easily melted and hot worked by pressure than magnesium and manganese-copper alloys. Heat treatment of chromium-aluminum steels for high damping is simple.Broader use in industry of increased damping capacity type 120S2YuD graphitic steels is desirable. They are hardened significantly by heat treatment, are relatively inexpensive, and have recommended themselves positively during experimental production tests on reduction of the noise of mechanisms with gear drives. The use of them in place of 40Kh and 30KhGSA steels causes a reduction in noise of mechanisms with gear drives of 6 db. In addition, the wear resistance of the gears increases.Kirov Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 3–4, December, 1987.     

Styrene–substituted‐styrene copolymerization using diphenylzinc–metallocene–methylaluminoxane systems

Homopolymerization of disubstituted styrenes (2,4‐ and 2,5‐dimethylstyrene) and trisubstituted styrene (2,4,6‐trimethylstyrene) and their copolymerization with styrene were carried out using diphenylzinc–metallocene–methylaluminoxane initiator systems for metallocene (n‐BuCp)₂TiCl₂ and for half‐metallocene CpTiCl₃. The studied comonomers were found to be less reactive than p‐tertbutylstyrene, p‐methylstyrene and styrene. The results indicate that, even though the methyl group has I+ inductive effect, di‐ and tri‐methylstyrenes are reluctant to undergo either homopolymerization or copolymerization. This behavior suggests that the reactivity is regulated not only by the inductive effect of the alkyl group but also by the steric impediment caused by the crowding of the substituents on the benzene ring. Copyright © 2006 Society of Chemical Industry     

Complexometric determination of zinc and cadmium oxides in “selenium ruby” type glasses

Glass and Ceramics -     

Comparative characteristics of the antioxidants of plant origin introduced in fat emulsion foods

One of the methods of increasing the quality of fatty products is including in their composition antioxidants, which provide the time of their conservation and improvement of their biological value. From this point of view calls concern a new drug epigallocatechina gallate. On the basis of these studies the prospects of usage were shown epigallocatechina gallate in fatty products and the paths of further applying in creation of food products.