It has been recognized since the 1950's that radioisotopic disequilibrium between naturally occurring parentdaughter isotope pairs in seawater can provide information on the rate of processes segregating them. In the surface ocean, the U-238:Th-234 parent-daughter pair tends to display measurable disequilibrium that is attributable to the effects of scavenging on particle reactive thorium. A ra...

Food and feeding-state dependent changes in chemoreceptor gene expression may allow Caenorhabditis elegans to modify their chemosensory behavior, but the mechanisms essential for these expression changes remain poorly characterized. We had previously shown that expression of a feeding state-dependent chemoreceptor gene, srh-234, in the ADL sensory neuron of C. elegans is regulated via the MEF-2...

In the alpha7 nicotinic acetylcholine receptors, we analyze the contribution of mutations E237A and V251T, together with the proline insertion P236', in the conversion of the charge selectivity from cationic to anionic. We show that the triple mutant exhibits spontaneous openings displaying anionic selectivity. Furthermore, at position 251, hydrophilic or even negatively charged residues are co...

We have characterized the ~234! and ~432! reconstructions of GaAs and InAs ~001! that are present in a metalorganic vapor-phase epitaxy ~MOVPE! reactor. Scanning tunneling micrographs show that these surfaces are terminated with arsenic and gallium ~or indium! dimers. The ~234! dimer row exhibits a mottled appearance, which is ascribed to the adsorption of alkyl groups on some of the sites. On ...

This study deals with the politics of Pakistan People’s Party governance during time period (2008-2013). The PPP considered mainstream political party and democratic force whole Pakistan. has discussed development institutionalization. It also explored development, stability, participation their relationship each other’s. seen system impact on economy, social country 2008 to 2013. examined how ...

Sediment resuspension occurs in the global ocean, which greatly affects material exchange between the sediment and the overlying seawater. The behaviours of carbon, nutrients, heavy metals, and other pollutants at the sediment-seawater boundary will further link to climate change, eutrophication, and marine pollution. Residual β activity of particulate (234)Th (RAP234) is used as a novel proxy ...