Sentences with word «divalent»

Addition of divalent cations at low pH makes it possible to capture the uncleaved RNA in metal - bound form.

Four crystal structures were determined of the catalytic domains of AC in complex with two different ATP analogs and various divalent metal ions.

CNG channels are nonselective cation channels that poorly discriminate between alkali ions and even allow the passage of divalent cations.

Photo - reduction of divalent mercury species in snow is enhanced by UV irradiation (30, 31).

GEM, with an atmospheric lifetime in the range of 5 — 24 months, can be transported across long distances to remote locations before conversion to divalent Hg species by atmospheric oxidation processes (4).

Direct anthropogenic sources such as coal combustion, however, still release large amounts of inorganic mercury into the atmosphere, either as gaseous elemental mercury (GEM; Hg °) or as divalent gaseous mercury species (Hg2 +)(3).

These asparagines are in a position homologous to the site in the TM2 region (Q / R site) of alpha - amino -3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors that is occupied by either glutamine (Q) or arginine (R) and that controls divalent cation permeability of the AMPA receptor channel.

Electrically silent divalent cation entries in resting and active voltage - controlled muscle fibers

Divalent gold complex isolated for the first time in a pure form / New fundamental insight also provides possible explanation of the mechanism of action of cytostatic gold (+ III) porphyrins...

Muneyyirci - Delale O. Divalent cations in women with PCOS: implications for cardiovascular disease.

It chelates divalent cations like zinc, iron, magnesium and calcium.

In both the United States and Europe, however, most sediment and peat record reconstructions show higher deposition of atmospheric divalent mercury during the 1970s (10, 11, 14), simultaneous with the peak in worldwide production of mercury of ≈ 107 kg year − 1 (Fig. 2B)(49).

Another methodological classic: James R. O'Neil, Robert N. Clayton, and Toshiko K. Mayeda (1969) «Oxygen Isotope Fractionation in Divalent Metal Carbonates» J. Chem.

Divalent Hg species are subject to rapid wet and dry deposition in terrestrial ecosystems.

The first direct measurements of total gaseous mercury (TGM, including GEM and divalent gaseous mercury species) were reported in the late 1970s during ship cruises across the Atlantic Ocean (7), but real - time atmospheric continuous monitoring at various European and Arctic locations was only initiated in the early 1990s (8).

Poorly characterized mechanisms driving both production and destruction of GEM in the interstitial air of snowpacks depend on environmental conditions (irradiation, temperature, and presence of water layer around snow grains) and the chemical composition of snow (e.g., presence of halogens or divalent mercury species as a consequence of surface deposition)(25).

Divalent cations in women with PCOS: implications for cardiovascular disease.

Based on these results the researchers were able to explain why DMT1 binds the divalent metal ions iron and manganese (Fe2 + and Mn2 +), but not calcium (Ca2 +)-- in spite of the latter being several orders of magnitude more abundant.

Thus, these results directly demonstrate that divalent metal ions participate in general folding of the ribozyme tertiary structure, and further indicate a more specific involvement of Mg (II) in catalysis.

In reality, though, the reaction is slow, inefficient and requires large quantities of both hydrogen peroxide and ferrous (Fe2 +, a divalent iron ion) salt — which serves as a catalyst.

The crystal structure of an unmodified hammerhead RNA in the absence of divalent metal ions has been solved, and it was shown that this ribozyme can cleave itself in the crystal when divalent metal ions are added.

Divalent metal - dependent catalysis and cleavage specificity of CSP41, a chloroplast endoribonuclease belonging to the short chain dehydrogenase / reductase superfamily