pretreatment of adults of iraq strain of afhstephenst with a sub-letlial dose of pcrmethrin resulted in a 65% enliancemenl of tolerance to this insecticide. similarly, pre-exposure of dub-lpr larvae to a sub-lethal dose of pcrmethrin resulted in increased tolerance to pcrmethrin. for the sensitive ind-s strain, the inductive effect was smaller. tiie results of bioassays of resistant and suscept...

The potentiation of synaptic activity in the hippocampal formation is a well documented phenomenon. It has been suggested, however, that a recruitment of additional afferent fibers can contribute to such an increase in synaptic activity. The hypothesis of an enhancement in afferent fiber activity, therefore, was investigated with the in vitro hippocampal slice preparation. Isolated radiatum fib...

Study of five-fold (P even, T odd) correlation in the interaction of slow polarized neutrons with aligned nuclei is a perspective way to test time reversal invariance due to expected enhancement of T violating effects in compound resonances. Possible nuclear targets are discussed which can be aligned both dynamically as well as by ”brute force” method at low temperature. Statistical estimation ...

Two dibenzoxanthenium derivatives bearing a 3,4-diaminophenyl group, compounds 1a and 1b, have been prepared and evaluated as near-infrared probes for the detection of nitric oxide. Compound 1a gave a 3-fold emission enhancement towards nitric oxide at 681 nm, whereas compound 1b exhibited OFF-ON emission behavior towards nitric oxide, resulting in a 35-fold increase in the fluorescence intensi...

We report, for the first time, the use of a water-soluble organometallic compound as a stable, reliable and high-contrast photoacoustic contrast agent. This gives a significantly higher contrast than that achievable with alternatives such as single-walled carbon nanotubes. Image enhancement of the rat cerebral cortex vasculature was observed using in vivo dark-field photoacoustic microscopy.

We demonstrate the rolling process of strained III-V compound semiconductor films upon epitaxial liftoff from the substrate. The formed tubular structures with diameters in the micron range, embedded with quantum confined GaAs light emitters in the ultra-thin tube walls (< 100 nm) show dramatic enhancement in intensity and reduction of bandgap as a function of tube curvature. Emission character...

Dennettine, a new 2,6-dimethoxychromone and three known phenanthrene alkaloids (uvariopsine, stephenanthrine and argentinine) in addition to the phenolic and known compound vanillin were isolated from the roots of Dennettia tripetala. Their structures were determined by physical and spectroscopical one dimensional (1D) and 2D-NMR analysis, including heteronuclear multiple bond correlation and n...

The structure of a new antifungal antibiotic, mulundocandin, C48H77N7O16, was elucidated by high field NMR experiments e.g., homo- and heteronuclear correlation spectra, distortionless enhancement by polarization transfer (DEPT) spectra as well as nuclear Overhauser effect. The compound is a lipopeptide antibiotic belonging to the echinocandin class.

A resorufin–dinitrophenyl ether conjugate (1) shows emission enhancement for aromatic thiols in aqueous media with a neutral–basic pH, while being nonemissive for aliphatic thiols. This is achieved by two electrophilic sites with different local softness on compound 1; the respective sites selectively react with aromatic or aliphatic thiolate anions.