Bacterial aerotaxis is a rapid response towards or away from oxygen. Here we report on the use of computer-assisted motion analysis coupled to flash photolysis of caged oxygen to quantify aerotactic responses in bacteria. The caged compound (mu-peroxo)(mu-hydroxo)bis[bis(bipyridyl) cobalt(III)] perchlorate liberates molecular oxygen upon irradiation with near-UV light. A mixture of cells and th...

Tri-block copolymer styrene-butadiene (SBS) is extensively applied in bituminous highway construction due to its high elasticity and excellent weather resistance. With the extension of time, tri-block structural SBS automatically degrades into bi-block structural SB- with some terminal oxygen-containing groups under the comprehensive effects of light, heat, oxygen, etc. In this paper, the effec...

The first principles were calculated to study the adsorption behaviors of caffeine molecules on the pristineand N-doped TiO2 anatase nanoparticles. Both oxygen and nitrogen in the caffeine molecule can reactstrongly with TiO2 nanoparticle. Thus, the binding sites were located on the oxygen or nitrogen atom ofthe caffeine, while the binding site of the TiO2 nanoparticle occurs ...

Abstract Hypoxia is a hallmark of many pathologies including solid tumors. In basic research, analysis hypoxia by light microscopy became feasible through development genetically encoded reporters. However, the dependence fluorescent proteins on molecular oxygen for maturation limits their use in hypoxic tissue. Overcoming this limitation, family hypoxia-sensors based oxygen-independent protein...

The electrochemical response of four natural cytotoxic thiazinoquinones isolated from the Aplidium species was studied using conventional solution-phase and solid-state techniques, based on the voltammetry of immobilized particles methodology. The interaction with O₂ and electrochemically generated reactive oxygen species (ROS) was electrochemically monitored. At the same time, a molecular mode...

An interesting change in mechanism (from concerted to biradical) is described for the reaction of acenes (benzene through pentacene) with molecular oxygen (either singlet oxygen, 1Deltag-O2, or triplet oxygen, 3Sigmag-O2).