Unexpected panelling by μ6-CO3(2-) anions has been observed to support the formation of a new and unusual Co15 cluster. The arrangement is further stabilised by bis-phenolate ligands which assemble in a manner akin to tetrahomodioxacalix[4]arene. The reaction proceeds in very low yield as μ6-CO3(2-) anions are formed in situ, but targeted synthesis by addition of carbonate improves synthetic yi...

Figure 2. Cr2O3 content of ferroan olivine in lowpetrologic-type CO3 chondrites and DOM 03238. DOMINION RANGE 03238: A POSSIBLE MISSING LINK IN THE METAMORPHIC SEQUENCE OF CO3 CHONDRITES. Jeffrey N. Grossman and Alan E. Rubin, U. S. Geological Survey, 954 National Center, Reston, VA 20192, USA ([email protected]); Institute of Geophysics and Planetary Physics, University of California, Los Ang...

We propose a novel mechanism for isotopic exchange between CO2 and O3 via O(1D) + CO2 --> CO3* followed by CO3* --> CO2 + O(3P). A one-dimensional model calculation shows that this mechanism can account for the enrichment in 18O in the stratospheric CO2 observed by Gamo et al. [1989], using the heavy O3 profile observed by Mauersberger [1981]. The implications of this mechanism for other stra...

The effect of ions presence such as: Na, K, Ca, Cl, SO4 and CO3, at various initial concentrations, on the kinetics of cadmium sorption by dried activated sludge was studied at 25°C and free initial pH solution in batch conditions. The presence of these ions in solution was found to inhibit slightly the uptake of cadmium by dried activated sludge at different degrees: sodium, potassium, calcium...

1. Aedes dorsalis larvae are one of the few organisms capable of inhabiting hypersaline NaHCO3-CO3 lakes. Under laboratory conditions larvae can survive and develop normally in saline media with pH values of 10-5, HCO3~ concentrations of 250 mM, or CO3 ~ concentrations of 100 mM. 2. Despite ingestion of alkaline media at a rate equal to 130% of larval body wt/day, these insects regulated haemol...

A structural study has been undertaken on a cobaltoan dolomite, with chemical formula CaMg0.83Co0.17(CO3)2 (cal-cium magnesium cobalt dicarbonate), from Kolwezi, Democratic Republic of Congo. Pale-pink euhedral cobaltoan dolomite was associated with kolwezite [(Cu1.33Co0.67)(CO3)(OH)2] and cobaltoan malachite [(Cu,Co)2(CO3)(OH)2]. A crystal with a Co:Mg ratio of 1:5.6 (SEM/EDAX measurement), tw...

X-ray powder diffraction and chemical analyses show that mammalian dental enamel apatite is an impure form of hydroxylapatite, Ca10(PO4)6(OH)2 (structure described in Elliott 1994). The major difference of enamel apatite from hydroxylapatite is in the presence of about 3 wt% CO3. Details of the crystallographic structures of carbonate-containing apatites (including minerals) are important becau...

Dolomite and magnesite are simple anhydrous calcium and/or magnesium carbonate minerals occurring mostly at Earth surfaces. However, laboratory synthesis of neither species at ambient temperature and pressure conditions has been proven practically possible, and the lack of success was assumed to be related to the strong solvation shells of magnesium ions in aqueous media. Here, we report the sy...

Recently there has been substantial progress towards computing the mod 2 cohomology of low rank sporadic simple groups. In fact the mod 2 cohomology of every sporadic simple group not containing (Z/2) has been computed, with the notable exceptions of HS (the Higman–Sims group) and Co3 (one of the Conway groups). The reason for these exceptions is that these two groups have large and complicated...

Formulas proposed for the mineral of bone were reviewed. Literature data were collected where Ca, P, Na, Mg and CO3 are determined in the same samples. These data were analyzed for their conformity to the above mentioned formulas. According to this analysis Mg is contained in a phase having the Ca/P of magnesium whitlockite within the limites of error. Na is contained in a carbonated calcium ph...