Artemisia pallens wall is a potant medicinal plant used in Ayurvedic system of medicines since ancient times. Taking into consideration the medicinal importance of the plant, a fraction of acetone extract was analyzed using GC-MS and the structures were confirmed by genesis. The major constitutents were alpha santonin, diisobutyl phthalate, tetradecane etc. The presence of alpha santonin and it...

Mass analysis is demonstrated for the detection of sub-microgram quantities of explosive samples on a metallic surface at atmospheric pressure using laser electrospray mass spectrometry (LEMS). A non-resonant femtosecond duration laser pulse vaporizes native samples for subsequent electrospray ionization and transfer into a time-of-flight mass spectrometer. LEMS was used to detect 2,3-dimethyl-...

Hipposponlachnins A (1) and B (2), possessing an unprecedented tetracyclo [9.3.0.02,8.03,7] tetradecane ring system, and the probable biogenetic precursor [3, (1R*,2E,4R*,7E,10S*,11S*,12R*)-10, 18-diacetoxydolabella-2,7-dien-6-one] of 1‒2 were isolated from the South China Sea marine sponge Hippospongia lachne. The structures of the novel compounds were determined using integrated spectroscopic...

A new method based on the calculation of autocorrelation functions for spectra measured at a high acquisition rate is developed to study spectral dynamics of single molecules. The technique allows for spectroscopy with time resolutions down to the luminescence lifetime. The method is used to study spectral diffusion in two-photon excitation spectra of diphenyloctatetraene molecules doped in an ...

A new application of second harmonic generation to selectively probe the surface of microscopic size centrosymmetric structures in centrosymmetric bulk media has been applied to polymer beads in aqueous solution and to oil droplets in an oil/water emulsion. The free energies of adsorption and the surface densities of organic molecules adsorbed from aqueous solution to 1 μm polystyrene bead surf...

Extraction of alcohols from n-tetradecane using various extraction solvents has been investigated at a range temperatures 295 to 393 K under ambient pressure. On the basis experimental liquid–liquid equilibrium data, distribution ratio and selectivity were calculated for 1-octanol, 1-decanol, 1-dodecanol (C8–C12) in 1-ethyl-3-methylimidazolium hydrogensulfate [C2mim][HSO4] sulfolane. Results sh...