Lead sorption efficiencies (sorption per surface area) were measured for a number of natural and synthetic Mn and Fe-oxides using a flow through reactor. The Mn-oxide phases examined included synthetic birnessite, natural and synthetic cryptomelane, and natural and synthetic pyrolusite; the Fe-oxides studied were synthetic akaganeite, synthetic ferrihydrite, natural and synthetic goethite, and ...

This study was conducted to prepare basic materials and offer advice regarding dietary habits to prevent and cure childhood obesity by comparing and analyzing dietary habit, nutritional status, blood factors, and mineral contents of hair. All subjects were stratified by their weight-length index (WLI). According to the standard WLI values, 64.9% of children were within the normal value, 13.5% o...

During its three flybys of Mercury, the MESSENGER spacecraft made the first detection of gamma-ray emission from the planet’s surface. With a closest approach distance of 200 km, the flybys provided an opportunity to measure elemental abundances of Mercury’s near-equatorial regions, which will not be visited at low altitude during MESSENGER’s orbital mission phase. Despite being limited by low ...

Surface-active centers were detected in HZSM-5 with a low content of iron (< 1000 ppm) activated by steaming and high-temperature calcination in inert atmospheres (up to 1323 K). These centers lead to the formation of surface oxygen (O)ad species from N2O and were characterized quantitatively by the transient response method. The total amount of active centers was proportional to the content of...

The objective of this study was to evaluate associations between short-term (hourly) exposures to particulate matter with aerodynamic diameters < 2.5 microm (PM2.5) and the fractional concentration of nitric oxide in exhaled breath (FE(NO) in children with asthma participating in an intensive panel study in Seattle, Washington. The exposure data were collected with tapered element oscillation m...

Atomic absorption spectrometry facilitates the reliable determination of mineral content during pharmaceutical quality control medicinal plants. In present work, measurable amounts Fe, Ca, Cu, K, Mg, Mn, Na and Zn were detected in leaves flowers Hypericum origanifolium Willd. through atomic spectrometry. Mean heavy metal H. was, descending order, Ca > Mg K Fe. was higher concentrations (11157.2...

The potential utility of paramagnetic transition metal complexes as chemical shift F magnetic resonance (MR) thermometers is demonstrated. Further, spin-crossover Fe complexes are shown to provide much higher temperature sensitivity than do the high-spin analogues, owing to the variation of spin state with temperature in the former complexes. This approach is illustrated through a series of Fe ...

Precision timing of millisecond pulsars in binary systems enables observers to detect the relativistic Shapiro delay induced by space time curvature. When favourably aligned, this constraints be placed on component masses and system orientation. Here we present results campaigns seven observed with 64-antenna MeerKAT radio telescope that show evidence delay: PSRs~J0101$-$6422, J1101$-$6424, J11...

Despite our extremely low atmospheric concentration of dihydrogen (B1 ppm), this substrate is a key metabolite of many anaerobic bacteria. In such living systems can be found the most prevalent enzymes for hydrogen processing, the nickel–iron hydrogenases ([NiFe]–H2ases). 1,2 These electrocatalysts specifically mediate the redox reaction H2 " 2H + + 2e at several hundred turnovers per second. T...