synthesis and characterization of 6-(hydroxymethyl)-14, 16-dimethyl-13, 14, 16, 17-tetrahydro-6h-13, 17-epiminodibenzo [e, l] [1, 4] dioxacyclotridecin-15 (7h)-oneabstractnew 6-(hydroxymethyl)-14, 16-dimethyl-13, 14, 16, 17-tetrahydro-6h-13, 17-epiminodibenzo [e, l] [1, 4] dioxacyclotridecin-15 (7h)-one (2a) was synthesized in good yield by the petrenko–kritchenko reaction of 2, 2'-((3-hydroxyp...

learning vocabulary constitutes a crucial step in language learning. amongst different word categories, compound words have failed to attract the attention they deserve. this led us to conduct a study trying to pinpoint the difficulties learning these words and to suggest some techniques facilitating their acquisition. to that effect, a questionnaire as well as a vocabu-lary test were given to ...

Control clumps of Selaginella wallacei Heiron., sprayed with distilled water with Tween 20, produced a high proportion of microsporangia. Similar clumps sprayed with 2-chlorethyl-phosphonic acid, and ethylene-releasing compound (Ethephon), at 7.65 and 76.5 mg/liter produced almost exclusively megasporangia. Treatment of Selaginella pallescens (Presl) Spring with Ethephon at 34 mg/liter caused t...

A model for the transmission of dengue fever with variable human population size is analyzed. We find three threshold parameters which govern the existence of the endemic proportion equilibrium, the increase of the human population size, and the behaviour of the total number of human infectives. We prove the global asymptotic stability of the equilibrium points using the theory of competitive s...

NCBI’s PubChem now features calculated three-dimensional conformers (3-D conformers) for a large proportion of the PubChem compound database (17 million records, 88%). In addition, conformers are clustered to provide a list of similar 3-D conformers. These similar conformers provide a more relevant and expanded set of compounds with potentially similar biological and pharmacological activity. P...

We consider sequential change-point detection in parallel data streams, where each stream has its own change point. Once a is detected stream, this deactivated permanently. The goal to maximize the normal operation of pre-change while controlling proportion post-change streams among active at all time points. Taking Bayesian formulation, we develop compound decision framework for problem. A pro...

Abstract This work deals with consumers' preferences about coffee. Firstly, a choice experiment is performed on sample of potential consumers. Following this, sensory test involving the tasting two varieties coffee carried out respondents, after which same supplied to them again. An innovative approach for building heterogeneous designs specifically developed case-study, based approximate desig...