The redox transformations of arsenic (As) in lakes are thought to be mainly controlled by algal/microbial processes. We tested if photochemical oxidation could also a significant process northern freshwater systems. exposed filtered natural water samples from four mine-impacted (Northwest Territories, Canada) and three unimpacted ponds (Nunavik, simulated solar radiation, followed As(III) oxida...

The bottom-up construction and operation of machines and motors of molecular size is a topic of great interest in nanoscience, and a fascinating challenge of nanotechnology. The problem of the energy supply to make molecular machines work is of the greatest importance. Research in the last ten years has demonstrated that light energy can be used to power artificial nanomachines by exploiting ph...

Abstract. Recent studies have been engaged in estimating the adverse effects of microplastic (MP) on soil quality parameters. Mass concentrations MP, as found highly contaminated soils, shown to weaken structure, and parts edaphon are adversely affected mainly by <100 µm MP size fraction. However, vast majority these used pristine particles, which surface characteristics different from those...

A new perspective on how to manipulate molecules by means of very strong laser pulses is emerging with insights from the so-called light-induced potentials, which are the adiabatic potential energy surfaces of molecules severely distorted by the effect of the strong field. Different effects appear depending on how the laser frequency is tuned, to a certain electronic transition, creating light-...

We report the synthesis of altitudinal molecular motors that contain functional groups in their rotor part. In an approach to achieve dynamic control over the properties of solid surfaces, a hydrophobic perfluorobutyl chain and a relatively hydrophilic cyano group were introduced to the rotor part of the motors. Molecular motors were attached to quartz surfaces by using interfacial 1,3-dipolar ...

introduction: myocardial infarction (mi) is associated with increased oxidative stress and reduced antioxidants. some studies have shown that exercise training increases the serum level antioxidants. therefore, this study investigated the effect of rehabilitation training on antioxidant status in patients with myocardial infarction. materials and methods: in this study, 20 patients with myocard...

In advanced oxidation processes (AOPs) operating in continuous mode, the flow rate and concentration of oxidants such as H2O2 at mixing point influent must be controlled so that oxidant residuals effluent are minimized while organic degradation is maximized. Designing a controller to regulate therefore, its photoreactor influent, needs determination reliable process dynamic model. this study, s...