Ambient volatile organic compounds (VOCs) play a critical role in air quality as important precursors for the formation of ozone and secondary aerosols. The characteristics ambient VOCs vary among different regions. In this study, sources from 33 sites 32 major cities across China were compiled field measurements literature. annual average VOC concentrations ranged 6.7 to 75.0 ppbv featured spa...

Abstract. Secondary organic aerosol (SOA) is formed in the atmosphere through oxidation and condensation of compounds. Intermediate-volatility compounds (IVOCs), with effective saturation concentration (C∗) at 298 K between 103 106 µg m−3, have high SOA yields can be important precursors. The first efforts to simulate IVOCs chemical transport models (CTMs) used volatility basis set (VBS), a hig...

The functional dynamics of microbial communities are largely responsible for the clean-up of hydrocarbons in the environment. However, knowledge of the distinguishing functional genes, known as the metabolic footprint, present in hydrocarbon-impacted sites is still scarcely understood. Here, we conducted several multivariate analyses to characterise the metabolic footprints present in a variety...

ed, the excitation may always be transferred to the S–H bond. S–H bond scission is the exclusive result of STM-based excitation. The efficient intramolecular excitation transfer responsible for this phenomenon may be regarded as a manifestation of the appreciable electric conductivity of aromatic thiols. Our observation of efficient 9 © 2003 American Institute of Physics AIP license or copyrigh...

We present a general approach to forming structure-activity relationships (SARs). This approach is based on representing chemical structure by atoms and their bond connectivities in combination with the inductive logic programming (ILP) algorithm PROGOL. Existing SAR methods describe chemical structure by using attributes which are general properties of an object. It is not possible to map chem...

Rieske dioxygenases have a history of utility in organic synthesis, owing to their ability catalyze the asymmetric dihydroxylation aromatics produce chiral diene-diol metabolites. However, as green-chemical tools has been limited by steric and electronic constraints on substrate scopes activity. Herein we report rational engineering widely used dioxygenase, toluene dioxygenase (TDO), improve ac...

Detection of aminoglycoside antibiotics by MS or HPLC is complicated, because a) carbohydrate molecules have low ionization ability in comparison with other organic molecules (particularly in MALDI-MS), and b) the lack of aromatics and/or amide bonds in the molecules makes common HPLC UV-detectors useless. Here, we report on the application of a previously developed method for amine derivatizat...