Southern States University

Abstract: 2-(4H-1,3-Benzoxazin-4-on-2-yl)-4,5,6-trichloro-1,3-tropolone, structural properties of which were studied using 1H NMR, IR-spectroscopy, mass spectrometry, and quantum chemistry has been obtained for the first time using an acid-catalyzed condensation reaction of 3,4,5,6-tetrachloro-1,2-benzoquinone with 2-methyl-4H-3,1-benzoxazin-4-one. It has been shown that the new tropolone possesses antibacterial activity against hospital-acquired strains of gram-negative (Escherichia coli, Salmonella enterica sv. Enteritidis, Acinetobacter baumannii, and Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus) bacteria. The obtained substance is suggested for development of a new antibacterial drug.

Abstract: EREMEYEV et al. elastic shells of thickness h and radius R are attached (Fig. 1). We assume that the shells are attached to the plate (substrate) at the points x= xk, y= yk (k= 1, 2,... n). The spherical shells are considered as membranes loaded by a uniform internal hydrostatic pressure p. In the equilibrium state, the force resultants acting on the shell surface is everywhere the same: N1= N2= N= pR/2. This N value is in fact the surface tension, and the whole membrane can be considered as a spherical shell of equal ...

Abstract: The adoption of sustainable agriculture and other sustainable forestry methods that can help to reduce tropical deforestation have received a great deal of attention in the literature (Adesina and Zinnah 1993, Akinola and Young 1985, Feder and Slade 1984, Holden 1993, Kebede et al. 1990). Although results from different studies can be compared in an absolute sense, there are very few individual studies that compare results and determine, through empirical analysis, whether policy can be universally applied. This paper uses farm-level data to determine whether some universal conclusions can be drawn about the adoption of agroforestry by peasant farmers in developing countries by comparing the land use choices of farmers in Rondonia, Brazil and Campeche, Mexico. The empirical results indicate that education level and the degree of exposure to information about agroforestry significantly influence the adoption of agroforestry and that deforestation levels for farmers in both nations are influenced by the size of the farm lots. The two communities used in the analysis differ in terms of tradition, history, geography, and economics but both experience a link between deforestation and imperfect information. Policies that address imperfect information in developing countries are likely to decrease deforestation as well as improve the well being of residents.

Abstract: A series of copper metallochelates C22H18CuN4O2X (X = Se, S, O) as models of active centers of natural metalloproteins have been synthesized on the basis of new azomethine ligand systems. The structure of the complexes has been studied by extended X-ray absorption fine-structure spectroscopy. It is shown that, in the metallochelates with X = Se or S, one azomethine chalcogen-containing ligand undergoes tridentate interaction with copper ions, while the other ligand is an acetate group. As a result, a complex with the N2O2X environment is formed, where one of the oxygen atoms of the acetate group is at a large distance from the metal ion: R = 2.56–2.68 A. For the metallochelate with X = O, coordination of the acetate group by a copper ion is found to be absent, and only interaction with azomethine ligands having average Cu-N/O distances R = 1.96–2.04 A is observed.