Small-conductance (KCa2) and intermediate-conductance (KCa3.1) calcium-activated K channels are voltage-independent and share a common calcium/calmodulin-mediated gating mechanism. Existing positive gating modulators like EBIO, NS309, or SKA-31 activate both KCa2 and KCa3.1 channels with similar potency or, as in the case of CyPPA and NS13001, selectively activate KCa2.2 and KCa2.3 channels. We...

High rates of antibiotic use have resulted in the pervasiveness of multi-drug resistant organisms. With rising drug-resistance the development of antibiotics with new targets against these pathogens is imperative. The T-box regulatory mechanism is a process specific to Grampositive bacteria and controls many essential genes including aaRS genes, which are code for the aminoacyl-tRNA synthetases...

SAR plays a prominent role in TSCA screening of new chemicals and existing chemicals in commerce. SAR models for bioavailability, ecotoxicology and health toxicology endpoints are being used to identlify chemicals with the greatest potential for ecological or health hazard, to set testing priorities, and to provide scientific support for a testing recommendation. SAR models vary considerably in...

Since the passage of the Toxic Substances Control Act (TSCA), which requires the U.S.Environmental Protection Agency (EPA) to assess potential toxic effects of new and existing chemicals, structureactivity relationships (SAR) analysis has been extensively and effectively used in the identification of potential health hazards of new (Premanufacturing Notification) industrial chemicals (Arcos, 19...

The structure of epothilone A, bound to , -tubulin in zinc-stabilized sheets, was determined by a combination of electron crystallography at 2.89 angstrom resolution and nuclear magnetic resonance–based conformational analysis. The complex explains both the broad-based epothilone structureactivity relationship and the known mutational resistance profile. Comparison with Taxol shows that the lon...

94. Van Quaquebeke, E.; Simon, G.; Andr, A.; Dewelle, J.; El Yazidi, M.; Bruyneel, F.; Tuti, J.; Nacoulma, O.; Guissou, P.; Decaestecker, C.; Braekman, J.C.; Kiss, R.; Darro, F. Id entification of a novel cardenolide (2''-oxovoruscharin) from Calotropis procera and the hemisynthesis of novel derivatives displaying potent in vitro antitumor activities and high in vivo tolerance: structureactivit...

Topological indices play an important role in Mathematical Chemistry especially in the quantitative structure-property relationship (QSPR) and quantitative structureactivity relationship (QSAR). Recent research indicates that the augmented Zagreb index (AZI) possess the best correlating ability among several topological indices. The main purpose of the current study is to establish some mathema...

Antenna trajectory or motion errors are pervasive in synthetic aperture radar (SAR) imaging. Motion errors typically result in smearing and positioning errors in SAR images. Understanding the relationship between the trajectory errors and position errors in reconstructed images is essential in forming focused SAR images. Existing studies on the effect of antenna motion errors are limited to cer...

Establishing relationships between the chemical structures and their activities or properties are crucial to achieve a goal, doing better and fewer experiments. The quantitative description of the relations is the so-called quantitative structureactivity/property relationships (QSAR and QSPR) [Gedeck et al. 2008, Yap et al. 2007]. QSAR studies express the biological activity of compounds as a f...