Microaerophilic bacteria are adapted to low oxygen environments, but the mechanisms by which their growth in air is inhibited are not well understood. The citric acid cycle in the microaerophilic pathogen Campylobacter jejuni is potentially vulnerable, as it employs pyruvate and 2-oxoglutarate:acceptor oxidoreductases (Por and Oor), which contain labile (4Fe-4S) centres. Here, we show that both...

this study was conducted in order to evaluate the effects of long term ageing on toughness andresilient modulus of asphalt concrete mixtures containing electric arc and basic oxygen furnacesteel slags. after initial evaluation of the properties of steel slags using x-ray diffraction andscanning electric microscope, eleven sets of laboratory mixtures were prepared. each set wastreated replacing ...

The nucleophilicity of transition metal thiolates is well-documented. Biologically relevant electrophilic substrates include oxygen or oxygen-transfer agents (such as H2O2) and alkylation agents (such as CH3I). Nature makes use of the latter with Zn-containing de-alkylation proteins such as the Ada repair mechanism and the former in the case of the post-translationally modified active form of N...

A series of single-molecule dysprosium (Dy 3+) complexes consisting b diketonate ligands, as water-containing complexes, and the auxiliary triphenylphosphine oxide (tppo)ligand water free were investigated potential white light emitters. The coordination environment choice ligands play an important role in behavior yellow blue emission Dy 3+ based on sensitization efficiency ion by ligands. By ...

A pentamethylcyclopentadienyl-iridium complex containing a tricyclic, dianionic, tridentate, scorpionate (facial binding), mixed organic-inorganic ligand was synthesized and characterized by single-crystal X-ray crystallography, as well as polynuclear NMR, UV-vis, and IR spectroscopies. The central cycle of the tridentate ligand consists of a modified boroxine in which two of the boron centers ...

The Antarctic icefish Chaenocephalus aceratus lacks the globins common to most vertebrates, hemoglobin and myoglobin, but has retained neuroglobin in the brain. This conserved globin has been cloned, over-expressed and purified. To highlight similarities and differences, the structural features of the neuroglobin of this colourless-blooded fish were compared with those of the well characterised...

A series of structural models of the Ni centre in [NiFeSe] hydrogenases has been developed which exhibits key structural features of the Ni site in the H2 cycling enzyme. Specifically, two complexes with a hydrogenase-analogous four-coordinate 'NiS3Se' primary coordination sphere and complexes with a 'NiS2Se2' and a 'NiS4' core are reported. The reactivity of the complexes towards oxygen and pr...

The photophysical properties of heteroleptic rotor-like Ru(ii) complexes containing both a cyclopentadienyl-type ligand and hydrotris(indazolyl)borate chelating unit with piano stool structure have been investigated.

The application of enantiomerically-pure ruthenium(II) catalysts containing N - functionalised TsDPEN ligand to the asymmetric transfer hydrogenation 15 examples ?-heterocyclic acetophenone derivatives is reported. Products up 99% ee were formed.

We prepared and characterized titanium complexes of a new mixed N,O-ligand obtained from oxygen-depleted calixarenes, which show interesting catalytic activity compared with complexes of a "regular" calixarene ligand.