Tetrahedrally Coordinated sp-Hybridized Carbon in SrCO Orthocarbonate at Ambient Conditions.

We have synthesized the orthocarbonate SrCO, in which carbon is tetrahedrally coordinated by four oxygen atoms, at moderately high pressures [20(1) GPa] and high temperatures (≈3500 K) in a diamond anvil cell by reacting a SrCO single crystal with SrO powder. We show by synchrotron powder X-ray diffraction, Raman spectroscopy, and density functional thoery calculations that this phase, and hence sp-hybridized carbon in a CO group, can be recovered at ambient conditions. The C-O bond distances are all of similar lengths [≈1.

The pilo-Ruffini complex: a non-sinus hair and associated slowly-adapting mechanoreceptor in primate facial skin.

A spray-type of nerve ending identified as a Ruffini corpuscle closely associated with a non-sinus hair has been defined in terms of its histologic, ultrastructural and physiologic parameters. The hair and its associated mechanoreceptor, termed a pilo-Ruffini complex, responds as a slowly adapting (SA) mechanoreceptor, whereas most non-sinus hair-associated mechanoreceptors are rapidly adapting. Morphologically, the terminal nerve fibers branch repeatedly within a unique connective tissue matrix, and the neurite and associated connective tissue matrix forms a collar around the hair follicle.