Tunable diode laser absorption spectrometry (TDLAS) is gaining in popularity for measuring the mole fraction [CO2] and stable isotopic composition (δ13C) of carbon dioxide (CO2) in air in studies of biosphere-atmosphere gas exchange. Here we present a detailed examination of the performance of a commercially-available TDLAS located in a high-altitude subalpine coniferous forest (the Niwot Ridge...

We performed classical molecular dynamics (MD) simulations to understand the mechanism of adsorption from a gas mixture of CO2 and H2 (mole fraction of CO2 = 0.30) and diffusion along a graphite surface, with the aim to help enrich industrial off-gases in CO2, separating out H2. The temperature of the system in the simulation covered typical industrial conditions for off-gas treatment (250-550 ...

A series of experiments of shallow and strong smouldering fronts in boreal peat have been conducted under laboratory conditions to study the CO and CO2 emissions. Peat samples of 100 mm by 100 mm in cross section and 50 mm in depth were smouldered in the cone calorimeter apparatus. Two laboratory variables, moisture content and the external heat flux are varied over a wide range of values to es...

Carbon dioxide is stored in the body in various forms, including carbonic acid, bicarbonate and carbamino compounds. The various stores of CO2 can be considered to be in the lung, blood, soft tissues and bone. In an adult human, these stores are thought to be in the order of 120 liters of CO2.’ It is common knowledge that hyperventilation will reduce the level of CO2 in the blood; however, only...

We investigated the long-term effect of elevated atmospheric CO2 on isoprenoid emissions from adult trees of two Mediterranean oak species (the monoterpene-emitting Quercus ilex L. and the isoprene-emitting Quercus pubescens Willd.) native to a high-CO2 environment. During two consecutive years, isoprenoid emission was monitored both at branch level, measuring the actual emissions under natural...

Two isostructural 1D compounds {[M3(hpdc)2(H2O)6] 2H2O}n (M = Mn, Co; H3hpde = 2-hydroxypyrimidine-4,6-dicarboxylic acid) were synthesized by the in situ hydrothermal reactions of 2-chloropyrimidine-4,6-dicarboxylic acid with MCl2 (M = Mn, Co) and NaOH; the MnII compound shows spin-canted antiferromagnetism, whereas the CoII compound exhibits the coexistence of spin-canting and a two-step field...

The effects of glucose and lactate infusion on palmitate oxidation were compared with the effect of 2-tetradecylg]ycidic acid (TDGA), an irreversible inhibitor of the carnitine acyltransferase I, in nonmoxic canine myocardium. The initial capillary transit retention fraction of [l-"C]palmitate and its fractional distribution between oxidation and esterification in myocardium were measured by th...

the presence of tribolium castaneum (herbst) in a stored food results in contamination and substantial economic damage due to loss of the products and a decrease in nutritional value. this study was conducted to determine the pesticidal and pest repellent activities of roots of laportea crenulata gaud. against t. castaneum. pesticidal activity was determined using surface film method, whereas, ...

Global maps of carbon dioxide (CO2) mole fraction (in units of parts per million) in the lower atmosphere are important tools for climate research since they can help identify sources and sinks of CO2. No satellite instrument currently provides estimates of the lower-atmosphere CO2, though inferences are possible using data from existing instruments. Two remote sensing instruments, the Orbiting...

The effect of cementite morphology on the corrosion layer formation four high-strength carbon steels was studied in an aqueous solution containing CO2 and CO2/H2S. linear polarization resistance weight loss data reveal that as phase fraction is increased, rate increases environment, while no trend observed CO2/H2S environment. results indicate a porous and, non protective forms whereas A mechan...