Pure neutral (CO2)n clusters and mixed (CO2)n(H2O)m clusters are investigated employing time of flight mass spectroscopy and single photon ionization at 26.5 eV. The distribution of pure (CO2)n clusters decreases roughly exponentially with increasing cluster size. During the ionization process, neutral clusters suffer little fragmentation because almost all excess cluster energy above the verti...

Geologic carbon dioxide (CO2) sequestration drives physical and geochemical changes in deep subsurface environments that impact indigenous microbial activities. The combined effects of pressurized CO2 on a model sulfate-reducing microorganism, Desulfovibrio vulgaris, have been assessed using a suite of genomic and kinetic measurements. Novel high-pressure NMR time-series measurements using (13)...

Introduction: The martian polar caps are in majority composed of CO2 ice [1-3]. Early modeling of the polar caps suggested that they were in equilibrium with the ~6 mbar CO2 atmosphere [2], and various observations have shown a ciclicity of growth and retreat, following martian seasons [4]. However, other studies show that CO2 ice constitutes only a thin veneer on the surface of a probably much...

In this work, we illustrate a template strategy to create extra pores in microporous carbon for enhancing ambient-pressure CO2 uptake, as exemplified in the context of carbonizing the silicon-containing POP, PPN-4, followed by removal of the silicon template. The resultant PPN-4/C600 demonstrates a remarkable enhancement of CO2 uptake capacity at 295 K and 1 bar by a factor of 2.3 compared to t...

SUMMARY The peak in vivo rates of catabolism to ‘‘@ CO2 of 4 C and of @ C were delayed from 30 to 90 mm in rats when excess thymine or excess 5-cyanouracil were injected together with the labeled compound. The delay was greater with 5-cyanouradil, which is a known inhibitor of rat liver pyrimidine reductase. When the peak output of 1 4 CO2 was thus delayed , the total recovery of @ @ C decr...

P microorganisms can acclimate to a wide range of CO2 concentration, from as low as 0.001% to '10% CO2 (volyvol in the air in equilibrium with their environment). Some can even grow in the presence of 40% CO2 (1). Acclimation to a limiting CO2 level, well below the Km(CO2) of their carboxylating enzyme, Rubisco (ribulose 1,5-bisphosphate carboxylaseyoxygenase), is achieved by substantial physio...

BICARBONATE MAY BE SECRETED INTO THE INTESTINAL LUMEN IN CHOLERA BECAUSE: HCO(3) (-) ions are transported, or because OH(-) ions accumulate and react with dissolved CO(2) to form HCO(3) (-). If HCO(3) (-) ions are transported into the lumen from the interstitial fluid, lumenal P(CO2) should increase (HCO(3) (-) right harpoon over left harpoon OH(-) + CO(2)); if OH(-) accumulates, P(CO2) should ...