Aprotic sodium-O2 batteries require the reversible formation/dissolution of sodium superoxide (NaO2 ) on cycling. Poor cycle life has been associated with parasitic chemistry caused by the reactivity of electrolyte and electrode with NaO2 , a strong nucleophile and base. Its reactivity can, however, not consistently explain the side reactions and irreversibility. Herein we show that singlet oxy...

In recent papers, there has been a lively exchange concerning theories for enzyme catalysis, especially the role of protein dynamics/pre-chemistry conformational changes in the catalytic cycle of enzymes. Of particular interest is the notion that substrate-induced conformational changes that assemble the polymerase active site prior to chemistry are required for DNA synthesis and impact fidelit...

toktam faal rastegar was born in quchan (iran). she completed her b.sc. in chemistry in 2005 from ferdowsi university, mashhad. she was graduated from m.sc. degree in organic chemistry from bu-ali sina university (2008), hamadan, iran. she is currently organic chemistry ph.d student under the supervision of prof. a. khazaei and prof. m.a. zolfigol in department of chemistry at bu-ali sina unive...

The front-end of the nuclear fuel cycle encompasses several chemical and physical processes used to acquire prepare uranium for use in a reactor. These same can also be weapons or nefarious purposes, necessitating need technical means help detect, investigate, prevent material technology. Over past decade, significant research effort has investigated compounds associated with cycle, including o...

A transient model simulation of the 40-year time period 1960 to 1999 with the coupled climate-chemistry model (CCM) ECHAM4.L39(DLR)/CHEM shows a stratospheric water vapor increase over the last two decades of 0.7 ppmv and, additionally, a short-term increase after major volcanic eruptions. Furthermore, a long-term decrease in global total ozone as well as a short-term ozone decline in the tropi...

Abstract. Despite several studies on decadal-scale solar influence climate, a systematic analysis of the Sun's contribution to decadal surface climate predictability is still missing. Here, we disentangle solar-cycle-induced response from internal variability and other external forcings such as greenhouse gases. We utilize two 10-member ensemble simulations with state-of-the-art chemistry–clima...

The use of enzymes in analytical chemistry has gained tremendous attention during the last 2-3 decades. The obvious and straightforward reason has to do with the specificity of enzymatic reactions. In other words, by incorporating an enzyme-related step in the analytical cycle, someone can achieve high selectivity by using non-selective detection techniques (e.g. spectrophotometry, fluorescence...