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difficult. By contrast it should be easily possible to qualitatively distinguish between "lone-pair" type orbitals on O bonded to one Si and one H and those with O bonded to two Si, simply by inspecting the number of peaks in p(q). Extended to solid surfaces this would provide a direct means of monitoring silanol, Si-O-H, and bridging oxygen, Si-O-Si, sites on the surface of a silica glass or silicate mineral.

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Semisynthesis has been employed to replace the axial methionine in horse heart cytochrome c with histidine. The reduction potential of the His-80 protein (cyt c-His-80) is 41 mV vs NHE (0.1 M phosphate; pH 7.0; 25 degrees C). The absorption spectra of oxidized and reduced cyt c-His-80 are very similar to those of the native protein in the porphyrin region, but the 695 nm band is absent in the oxidized His-80 protein.

No abstract