Oxidation of 2,4-dichlorophenol in saline water by unactivated peroxymonosulfate: Mechanism, kinetics and implication for in situ chemical oxidation.

Inorganic and organic pollutants present a hazard to surface and groundwater resources. Peroxymonosulfate (PMS, HSO) has received increasing attention for in situ chemical oxidation (ISCO) capable of remediating contaminated sites. Considering that saline waters occur widely in natural environments, it is desirable to evaluate the effect of Cl on the PMS oxidation of organic compounds.

Thermokinetic Analysis of Protein Subunit Exchange by Variable-Temperature Native Mass Spectrometry.

Many protein complexes are assembled from a varying number of subunits, which are continuously exchanging with diverse time scales. This structural dynamics is considered to be important for many regulatory and sensory adaptation processes that occur . We have developed an accurate method for monitoring protein subunit exchange by using native electrospray ionization mass spectrometry (ESI-MS), exemplified here for an extremely stable Rad50 zinc hook (Hk) dimer assembly, Zn(Hk).

UVC-assisted photocatalytic degradation of carbamazepine by Nd-doped SbO/TiO photocatalyst.

The photocatalytic degradation of carbamazepine (CBZ) in ultra-pure water was investigated by using neodymium (Nd)-doped antimony trioxide (SbO)/titanium dioxide (TiO) photocatalyst under the UVC irradiations of 254 nm wavelength. The hydrothermal method was used for the fabrication catalyst samples with different ratios of Nd (0%-2%) dopant, and characterised by X-ray diffraction pattern (XRD) to investigate the crystallinity. Scanning electron microscopy (SEM) provided the surface morphologies, Bruanuer-Emmer-Teller (BET) analysis gave the textural properties, and UV-Vis diffuse reflectance absorption spectroscopy (DRS) was used for the investigation of the optical properties of synthesized catalysts.

Quantitation of Thyroid Hormone Binding to Anti-Thyroxine Antibody Fab Fragment by Native Mass Spectrometry.

Thyroid hormones are important regulatory hormones, acting on nearly every cell in the body. The two main thyroid hormones are l-thyroxine (tetraiodo-l-thyronine, T) and 3,3',5-triiodo-l-thyronine (T), which are produced in the thyroid gland and secreted into the blood stream. Other important thyroid hormone metabolites are 3,3'-diiodo-l-thyronine (T) and l-thyronine (T), which may show increased levels in circulation due to dietary iodine deficiency or other medical disorders.

Bioconjugation with Aminoalkylhydrazine for Efficient Mass Spectrometry-Based Detection of Small Carbonyl Compounds.

Bioconjugation through oxime or hydrazone formation is a versatile strategy for covalent labeling of biomolecules in vitro and in vivo. In this work, a mass spectrometry-based method was developed for the bioconjugation of small carbonyl compounds (CCs) with an aminoalkylhydrazine to form stable hydrazone conjugates that are readily detectable with electrospray ionization mass spectrometry (ESI-MS). Out of all hydrazine reagents tested, 2-(dimethylamino)ethylhydrazine (DMAEH) was selected for further analysis due to the fastest reaction rates observed.

Heterometallic Cluster-Capped Tetrahedral Assemblies with Postsynthetic Modification of the Metal Cores.

Combining the star-shaped alkynyl ligands with low-nuclearity gold-copper triphosphane clusters produces 3D metallocage aggregates, which demonstrate room temperature phosphorescence in solution (max Φ =0.6). Their luminescence mainly originates from cluster-localized metal-to-ligand charge transfer excited state.

The Crystal Structure of a Bacterial l-Arabinonate Dehydratase Contains a [2Fe-2S] Cluster.

We present a novel crystal structure of the IlvD/EDD family enzyme, l-arabinonate dehydratase from Rhizobium leguminosarum bv. trifolii (RlArDHT, EC 4.2.