The concept of incremental aerosol reactivity is introduced, and the incremental aerosol reactivities of a number of important anthropogenic and biogenic hydrocarbons are investigated for four ambient scenarios. The incremental aerosol reactivity, defined as a change in the secondary organic aerosol mass produced (in μg m-3) per unit change of parent organic reacted (in ppb), is a measure of th...

Both ceria (CeO2) and alumina (Al2O3) are very important catalyst support materials. Neutral binary oxide nanoclusters (NBONCs), CexAlyOz, are generated and detected in the gas phase and their reactivity with carbon monoxide (CO) and butane (C4H10) is studied. The very active species CeAlO4 (●) can react with CO and butane via O atom transfer (OAT) and H atom transfer (HAT), respectively. Other...

A guanidinato-stabilized binuclear yttrium carbyne complex [(PhCH 2 ) NC(NC 6 H 3 i Pr -2,6) ] Y (µ -Me)(AlMe 4 -CH) ( 1 was synthesized via C−H bond activation and its versatile reactivities were investigated. Complex underwent σ-bond metathesis with PhSSPh nucleophilic addition...

Methodology is described for the synthesis of DNA oligomers containing a free 3'-thiol group which can be selectively crosslinked with a wide variety of probes. This chemistry is compatible with both phosphotriester and phosphoramidite solid phase chemistry. Moreover, the sulphydryl group is introduced into the 3'-nucleoside solid support linkage prior to oligonucleotide synthesis. Consequently...

-l. Significant levels of aryl acylamidase (E.C. 3.5.1:13) activity have been found in extracts of larvae of the webbing clothes moth, Tineola bisselliella using acetyl p-nitroanilide as substrate. 2. Gel electrophoresis suggests that the activity is due to more than one enzyme. Inhibitor studies show that these enzymes are probably of the "active serine" type but have a requirement for a free ...

Human platelets stored at 22 degrees C were subjected to standard hypotonic stress at intervals up to five days after collection. Changes in light absorbance were recorded during the reaction, and size distribution was measured directly using a Coulter Model ZBI Counter and Channelyzer. Recovery following osmotic stress was measured by change in absorbance, as well as by change in platelet size...

The effects of five UICC asbestos samples, titanium dioxide, and quartz on the bovine red cell membrane have been studied in erythrocyte ghosts by the spin labelling technique. Analysis of the electron paramagnetic resonance (EPR) spectra of two sulphydryl reactive spin labels and one fatty acid spin label in red cell ghosts showed modifications in membrane protein after asbestos treatment but ...

Plasma membrane vesicles are shed from monolayer cell cultures during incubation in low concentrations of formaldehyde and other sulphydryl blocking reagents. In both 3T3 and SV3T3 cells disulphide reducing agents, including dithiothreitol and mercaptoethanol, potentiate formaldehyde-induced vesiculation. Plasma membrane vesiculation is shown to be a temperature-dependent phenomenon which occur...