A theorem of A. Schrijver asserts that a d–regular bipartite graph on 2n vertices has at least ( (d− 1)d−1 dd−2 )n perfect matchings. L. Gurvits gave an extension of Schrijver’s theorem for matchings of density p. In this paper we give a stronger version of Gurvits’s theorem in the case of vertex-transitive bipartite graphs. This stronger version in particular implies that for every positive in...

The interaction of the phage T4 Dam DNA-[N6-adenine] methyltransferase with 24mer synthetic oligonucleotide duplexes having different purine base substitutions in the palindromic recognition sequence, GATC, was investigated by means of gel shift and methyl transfer assays. The substitutions were introduced in either the upper or lower strand: guanine by 7-deazaguanine (G-->D) or 2-aminopurine (...

The goal of this study was to develop pregelatinized starch (P-St) and polyvinyl alcohol (PVOH) fi lms as water-soluble laundry plastic bags avoid having contact with COVID-19 infected clothes by extrusion method. effects content on the properties were examined. PVOH P-St blend compounded twin- screw extruder various 0, 10, 20, 30, 40% weight xed glycerol 20 phr. produced blown lm extrusion. ch...

China has experienced unprecedented urbanization since the 1980s, resulting in substantial climatic effects from local cities to broad regions. Using the Weather Research and Forecasting model dynamically coupled to an urban canopy model, we quantified the summertime climate effects of urban expansion in China's most rapidly urbanizing regions: Beijing-Tianjin-Hebei (BTH), Yangtze River Delta (...

In the paper, three lower bounds are given for the Morse index of a constant mean curvature torus in Euclidean 3-space, in terms of its spectral genus g. The first two lower bounds grow linearly in g and are stronger for smaller values of g, while the third grows quadratically in g but is weaker for smaller values of g.

The International Market generates potential new opportunities. Another traditional motive for companies to become multinationals is secure the resources needed. With a multidomestic strategy, state managers have autonomy tailor company's products as necessary meet specific needs and preferences of local customers. company uses global strategy offer standard across country markets, with competi...