(a) y′ = 1 + xy (b) y′ = −2xy (c) y′ = 1− 2xy Answer: If (b) were correct, then, when x = 0, we would have that y′ = 0. However, the slope of the tangent line is clearly positive when x = 0 in the picture, so (b) cannot be correct. If (a) were correct, then y′ would be positive for all positive values of x. However, the slope of the tangent line is clearly negative for most positive x, so (a) c...

A PCR-based assay was developed to discriminate the classical, El Tor, and Haitian types of ctxB alleles. Our retrospective study using this newly developed PCR showed that Haitian ctxB first appeared in Kolkata during April 2006, and 93.3% of strains isolated during 2011 carried the new allele. Dendrogram analysis showed a pulsed-field gel electrophoresis (PFGE) pattern of the new variant stra...

Lepidium oblongum, of American origin is a new member the European adventive flora, only detected in Romania so far. The first Hungarian stand was discovered 2018, and others 2020. Based on our studies, we detail its morphological characteristics comparison with other species. We present drawing table to help identify oblongum easily identifiable by divided (lobed or lobed-dentated) upper stem ...

The influence of L-serine on the growth of different strains of the genus Bacillus was investigated. It has been observed that the addition of L-serine to minimal synthetic media results in an inhibition in the growth of certain strains of Bacillus spp. but not B. thuringiensis. Then L-serine-resistance phenomenon was used in isolation of B. thuringiensis strains from soil. An isolation method ...

A total of 36 strains belonging to 19 different species of Acanthamoeba were compared for temperature tolerance, ability to grow in an axenic medium, cytopathic effect in Vero cell culture, and virulence in mice. Pathogenic strains appeared to belong to different species, whereas pathogenic and nonpathogenic strains occurred in one species. Although growth at high temperatures and readiness to ...

background: pseudomonas aeruginosa is the causing agent of many hospital infections and metallo-beta-lactamases (mbl) are being reported with increasing frequency. the aim of this study was to determine the frequency of metallo-&beta-lactamases; (mbl) and vim-1 gene in multidrug-resistant strains of p. aeruginosa isolates and to compare the methods of phenotypic and molecular detection. materia...

We study the computational complexity of languages which have interactive proofs of logarithmic knowledge-complexity. We show that all such languages can be recognized in BPP . Prior to this work, for languages with greater-than-zero knowledge-complexity only trivial computational complexity bounds were known. In the course of our proof, we relate statistical knowledgecomplexity with perfect kn...

Root nodulating bacteria was isolated from root nodules of Vigna trilobata (L) Verdc. Plants raised in the soils were collected from five geographically different areas in Andhra Pradesh, India. The bacteria was identified as Agrobacterium tumefaciens strains by 16S rDNA analysis. Except A. tumefaciens MRR 102, all the strains produced round shape and white coloured colonies with lot of mucilag...

mtDNA restriction analysis has been carried out with 45 different commercial Saccharomyces wine yeast strains. The analysis with Hinf I provided unique profiles for 17 of the 45 strains and can therefore be considered as individual strains. Nevertheless, among the remaining 28 strains, only eight mtDNA restriction patterns appeared. These strains were subjected to electrophoretic karyotyping an...