Twelve phenolic compounds with related structures were analyzed for their ability to act as chemoattractants for Agrobacterium tumefaciens C58C1 and as inducers of the Ti plasmid virulence operons. The results divided the phenolic compounds into three groups: compounds that act as strong vir inducers and are chemoattractants for A. tumefaciens C58C1 harboring the nopaline Ti plasmid pDUB1003 de...

Visual information retrieval (VIR) is a research area with more than 300 scientific publications every year. Technological progress lets surveys become out of date within a short duration. This paper intends to shortly describe selected important advances in VIR in recent years and point out promising directions for future research. A software architecture for visual media handling is proposed ...

The Visual Information Retrieval (VIR) area requires robust implementations achieved trough mathematical representations for images or data sets. The implementation of a mathematical modeling goes from the corpus image selection, an appropriate descriptor method, a segmentation approach and the similarity metric implementation whose are treated as VIR elements. The goal of this research is to f...

Degradasie van Gonometa postica-sy as gevolg van bleiking is nie alleen ’n belangrike probleem vir verbruikers nie, maar ook vir die vervaardiger. Die doel met die navorsing was om die effek van waterstofperoksiedbleiking op G. postica-sy te bepaal. Die spesifieke doelstelling was om die invloed van temperatuur, pH en tydsduur op waterstofperoksiedvrystelling, kleurverskil, breekkrag en styfhei...

In the framework of program initiated at N.I. Vavilov All-Russian Institute Plant Genetic Resources (VIR), nomenclatural standards five domestic black currant cultivars have been prepared. The present paper presents these bred VIR: ‘Binar’, ‘Veloy’, ‘Peterburzhenka’, ‘Poeziya’ and ‘Trilena’. morphological traits breeding characters are described. Iinformation is provided on formation developmen...

Semi-analytical models of galaxy formation can be used to predict the evolution of the number density of early-type galaxies as a function of the circular velocity at the virial radius, vc,vir. Gravitational lensing probability and separation distribution on the other hand are sensitive to the velocity dispersion (or circular velocity) at about the effective radius. We adopt the singular isothe...

Professionele verpleegkundiges het ’n verpligting teenoor verpleegstudente om hulle die geleentheid vir betekenisvolle leerervarings te gee en om die talle oom blikke vir onderrig wat die inform ele leersituasie bied, ten voile te benut. Die klem val op die verduideliking van die fynhede van versorging en die noodsaaklikheid om van die gehalte en verskeidenheid persoonlike kontaktedie kritieke ...

λ Virginis is a well-known double-lined spectroscopic Am binary with the interesting property that both stars are very similar in abundance but one is sharp-lined and the other is broad-lined. We present combined interferometric and spectroscopic studies of λ Vir. The small scale of the λ Vir orbit (∼ 20 mas) is well resolved by the Infrared Optical Telescope Array (IOTA), allowing us to determ...