Merged Evolution

Effect of CO Pressure Gradients on the Photochemistry and Thermal Chemistry of Fe(CO)5 Physisorbed into Porous Vycor Glass

“…To a significant extent, surface pH reflects the method of preparation of the silica matrix and the thermal history of the sample . The pH of the PVG surface, for example, is between 4 and 5 …”

“…Nonetheless, the absence of any indication of Fe(II) in any Mossbauer and EXAFS spectra of the photoproducts generated to date in PVG and dried TMOS/MeOH/H 2 O xerogels, − ,, the similarity of the resolved absorptions with those of the Fe 2 O 3 standard, which does not contain Fe(II), and a ligand field splitting within experimental error of those for Fe 2 O 3 (vide infra), collectively point to Fe(III) as the sole oxidation product in these nanoporous silicas under the conditions of these photochemical experiments. Since oxidation of Fe 0 by either O 2 or adsorbed water depends on [H + ], the extent of oxidation in silica matrices may reflect the pH of the different silica surfaces on which it occurs . To a significant extent, surface pH reflects the method of preparation of the silica matrix and the thermal history of the sample .…”

Fatal asymmetries

“…Biologists argue that “Darwin’s faith in this perpetual diversification of life had been misplaced; the effectiveness of evolutionary process in generating diversity could not be ensured in a world dominated by humans” (Steffes, 2013, p. 396). If this is the case, we might say, in Darwin’s language, that as far as human class has become the main evolutionary force (Chisholm & Burbank, 2001; Goonatilake, 1999), artificial selection is instigating the antievolutionary tendencies that biologists report (Bostrom, 2004; Ceballos et al, 2017; Palumbi, 2001).…”

Social Foundations of Human Space Exploration

“…It consisted of crude sketches of the Arecibo telescope, our Solar System, DNA, a stick figure of a human, and signs of the biochemicals of Earthly life. In 1999In , 2003 radio messages with varying structures suggested by the Russian astronomer Aleksandr Zaitsev were sent from Ukraine to stars 20 and 69 light-years from Earth. The signal in 2008 included digital text messages, photographs, and drawings from ordinary citizens.…”