A shock tube study of the reaction of the hydroxyl radical with propane

The rate coefficient for the reaction of the hydroxyl radical, OH, with propane has been measured at 1220 K in shock tube experiments, and a value of (1.58 ± 0.24) × 10¹³ cm³/mol s was obtained. This measured value is compared with previous experimental results and a transition-state theory calculation.     

Synthesis and structure of a bis(ethynyl)-substituted oxahexacyclic cage ether

Intramolecular dehydration of a cage-diol results in the title compound. This crystallizes in the monoclinic space group P2₁/c; a = 8.6403(8), b = 9.5698(7), c = 14.062(1) Å = 107.47(7)° and Z = 4.     

Application of Co-Culture Technology to Enhance Protease Production by Two Halophilic Bacteria,Marinirhabdus sp. and Marinobacter hydrocarbonoclasticus

Although axenic microbial cultures form the basis of many large successful industrial biotechnologies, the production of single commercial microbial strains for use in large environmental biotechnologies such as wastewater treatment has proved less successful. This study aimed to evaluate the potential of the co-culture of two halophilic bacteria, Marinirhabdus sp. and Marinobacter hydrocarbonoclasticus for enhanced protease activity. The co-culture was significantly more productive than monoculture (1.6–2.0 times more growth), with Marinobacter hydrocarbonoclasticus being predominant (64%). In terms of protease activity, enhanced total activity (1.8–2.4 times) was observed in the co-culture. Importantly, protease activity in the co-culture was found to remain active over a much broader range of environmental conditions (temperature 25 °C to 60 °C, pH 4–12, and 10–30% salinity, respectively). This study confirms that the co-culturing of halophilic bacteria represents an economical approach as it resulted in both increased biomass and protease production, the latter which showed activity over arange of environmental conditions.     

Ceramics from the Celtic Oppidum of Manching and Its Influence in Central Europe

We present an overview on an extended study of Celtic ceramics from the oppidum of Manching and from some contemporary Celtic sites. The results of neutron activation analysis, thin section microscopy and Mössbauer spectroscopy are combined with the existing detailed archaeological typology to provide information on the provenance of Celtic pottery and on details of its production. The data indicate that there was only very limited exchange of material but far reaching transfer of technology.     

Molecular Structure of [Me<Subscript>2</Subscript>Al(μ-OPh)]<Subscript>2</Subscript>: A Crystallographic and Ab initio Study

Abstract The molecular structure of [Me₂Al(μ-OPh)]₂ has been determined. The phenoxide ring is parallel to the Al₂O₂ ring rather than the energetically favored perpendicular configuration determined by ab initio calculations. Ab initio calculations successfully predict the structures of sterically demanding analogs. The adoption of the parallel configuration allows for an estimation of the magnitude of crystal packing forces. A discussion of the parameters controlling the structures of dialkylaluminum phenoxides is presented. Crystal data: group Pbca, a = 12.127(2), b = 8.491(2), c = 17.299(4) ?, V = 1781.3(6) ?³, Z = 4, R = 0.0695, wR ₂ = 0.1390. Graphical Abstract The molecular structure of [Me₂Al(μ-OPh)]₂ has been determined. The phenoxide ring is parallel to the Al₂O₂ ring rather than the energetically favored perpendicular configuration as determined by ab initio calculations.