Fluorescence spectroscopy is an important tool of the bioche mist studying the structure and interac tion s of prote ins and nucle ic acid s. The four bas ic quantities to measure accurately are: 1. s pec tra (co rrected excitation and emiss ion). 2. quantum yields (0), 3. fluorescence decay characte ri stics, and 4_ poLarization_ Co mmercially availab le instruments, with little modification, ...

The effect of relative humidity (RH) on aerosol formation by the semi-volatile oxidation products of the a-pinene/O3 system has been comprehensively studied. Experiments were performed in the presence of ammonium sulfate (aqueous, dry), ammonium bisulfate seed (aqueous, dry), and aqueous calcium chloride seed aerosols to ascertain their effect on the partitioning of the oxidation products. The ...

Intercalation imparts interesting features to the host graphite material. Two different types of intercalated compounds called (GIC-bisulphate or Nyex 1000 and GIC-nitrate or Nyex 3000) were tested for their adsorption capacity and ability to undergo electrochemical regeneration. It was found that Nyex 3000 showed comparatively slow kinetics along with reduced adsorption capacity to one half fo...

I read with interest the article from Bermudez et al., "Environmental Tobacco Smoke Is Just as Damaging to DNA as Mainstream Smoke" (EHP 102: 870-874). Environmental tobacco smoke (ETS) is a complex mixture of chemicals resulting from dilution in a confined environment of tobacco smoke. ETS has three forms: 1) sidestream smoke (SS) is produced by a cigarette during the puff intervals, 2) mainst...

The undesirable loss of methane (CH4) at remote locations welcomes approaches that ambiently functionalize CH4 on-site without intense infrastructure investment. Recently, we found electrochemical oxidation vanadium(V)-oxo with bisulfate ligand leads to activation ambient conditions. key question is whether such an observation a one-off coincidence or general strategy for electrocatalyst design...