The mechanism of the low temperature oxidation of gaseous acetaldehyde was investigated in the temperature range of 1 50-400?°C. The minor, intermediate and major products were identified and measured quantitatively by sampling directly into the ionization chamber of an MS10-C2 mass spectrometer from the reactor. The formation of H2O, CO, CO2, HCOOH, H2, HCHO, CH3COOH and CH3OH as the major pro...

Ribulosebisphosphate carboxylase/oxygenase requires CO2 and Mĝ "*" for activation; CO2 reacts with a protein e-amino group to form a carbamate which is stabilized by binding of Mg2+. In the case of the hexadecameric enzyme from spinach, the site of carbamate formation is Lys-201 (Lorimer, 1981). The enzyme from Atoatigenes eutrophuSj also hexadecameric, undergoes a substantial change in conform...

BACKGROUND AND PURPOSE Responsiveness to CO2 is an established test of cerebrovascular reserve capacity. Arterial partial pressure of CO2 (PCO2) and arterial blood pressure (BP) are key parameters for cerebral blood flow. To investigate the interaction between PCO2 and BP, we performed a study with simultaneous measurement of CO2 and BP during CO2 reactivity testing with transcranial Doppler so...

FeCO3 cement can be produced by reacting CO2(aq) and particulate-Fe(0). Process conditions solution compositions influence properties through kinetics of Fe-dissolution FeCO3-precipitation. This study investigates in dilute systems (water(wt.)/Fe(wt.) = 1000) at 30/60 °C, 1/10 barg CO2-pressures. Experimentally, time-evolution composition shows increased [Fe] solution-pH. As a proxy for high-pr...

The Front Cover shows photo-thermal catalyst Ni/TiO2 providing significantly increased CO and CO2 conversion under light irradiation. In their Research Article, F. Yu, B. Dai, Y. Zhou co-workers found that photoinduced charge carriers on the surfaces of could enhance formation intermediate species, reduce activation energy barrier required for reaction advance performance CO/CO2 methanation. Mo...

Ruiz, Ofelia S., R. Brooks Robey, Yi-Yong Qiu, Long Jiang Wang, Cheng Jin Li, Jianfei Ma, and Jose A. L. Arruda. Regulation of the renal Na-HCO3 cotransporter. XI. Signal transduction underlying CO2 stimulation. Am. J. Physiol. 277 (Renal Physiol. 46): F580–F586, 1999.—We have previously shown that CO2 stimulation of the renal Na-HCO3 cotransporter (NBC) activity is abrogated by general inhibit...

We studied the participation of adrenal medulla (AM) chromaffin cells in hypercapnic chemotransduction. Using amperometric recordings, we measured catecholamine (CAT) secretion from cells in AM slices of neonatal and adult rats perfused with solutions bubbled with different concentrations of CO2. The secretory activity augmented from 1.74 +/- 0.19 pC/min at 5% CO2 to 6.36 +/- 0.77 pC/min at 10%...

In this study, N-containing pitch-based activated carbons (NPCs) were prepared using petroleum pitch with a low softening point and melamine with a high nitrogen content. The major advantage of the preparation method is that it enables variations in chemical structures and textural properties by steam activation at high temperatures. The adequate micropore structures, appropriate chemical modif...

Patients with chronic obstructive pulmonary disease (COPD), acute lung injury and critical care illness may develop hypercapnia. Many of these patients often have muscle dysfunction which increases morbidity and impairs their quality of life. Here, we investigated whether hypercapnia leads to skeletal muscle atrophy. Mice exposed to high CO2 had decreased skeletal muscle wet weight, fiber diame...

Development of new chemical processes using CO2 as raw material has become a high priority for scientists. Utilisation of CO2 as feedstock would have the advantages of being naturally occurring, abundant, and inexpensive. However, due to the thermodynamic and kinetic stability of CO2 its activation represents a challenge for chemists. In this context, the low reactivity of CO2 can be overcome b...