Floodplain forests directly influence water quality by serving as sinks, sources, or transformers of nutrients. Increases in the demand for timber raise the question of how silvicultural disturbance may affect this funct ion. The object ive of this research was to compare biogeochemical relationships between undisturbed vs. disturbed conditions in a floodplain forest. A randomized complete b lo...

Conventional water chemistry parameters such as hardness, alkalinity, and organic carbon are known to affect the acutely lethal toxicity of copper to fish and other aquatic organisms. In the present study, we investigate the influence of these water chemistry parameters on short-term (3 h), sublethal (0-40 microg/L) copper toxicity to the peripheral mechanosensory system of larval zebrafish (Da...

The recently developed effective fragment potential (EFP) model is applied to the description of a series of small water clusters, (H2O)n, n = 3−5. These results are compared with those found in the literature. The model accurately reproduces results obtained at ab initio levels of theory, while the computational cost is comparable to that of models employing empirical potentials. The EFP model...

An efficient and mild synthesis of quinoxalines in cludingcyclo-condensation of 1, 2-phenylenediamine and 1, 2-diketonesin the presence of1mol% catalytic amount of SnO2 nanoparticles (1 mol%) in water at room temperature is established. On the whole, this study introduced at this point is substantial in terms of using water as solvent, low reaction time (5 to 10 minutes), high yields...

Water is a small molecule that nevertheless perturbs, sometimes significantly, the electronic properties of an enzyme's active site. In this study, interactions of a water molecule with the ferric heme and the compound I (Cpd I) intermediate of cytochrome P450 are studied. Energy decomposition analysis (EDA) schemes are used to investigate the physical origins of these interactions. Localized m...

The paper is a short review on nitrogen compounds removal, as ammonia, nitrate, nitrite, from municipal waste water, containing primary information of nitrogen chemistry, consideration on the physical-chemistry methods of removal and also on the most popular wastewater nitrification systems[1].

Reactions of formamide (NH2COH) in the presence of catalysts of both terrestrial and meteoritic origin yield, in plausible and variegated conditions, a large panel of precursors of (pre)genetic and (pre)metabolic interest. Formamide chemistry potentially satisfies all of the steps from the very initial precursors to RNA. Water chemistry enters the scene in RNA non-enzymatic synthesis and recomb...

Nanometer-Scale Phase Separation and Preferential Solvation in THF Water Mixtures: Ultrafast Electron Hydration and Recombination Dynamics Following CTTS Excitation of I Arthur E. Bragg,* Godwin U. Kanu, and Benjamin J. Schwartz* Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218-2680, United States Department of Chemistry and Biochemistry, University of California...

1 Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-25, E-08034 Barcelona, Spain, 2 Research group EnVOC, Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, 3 Catalan Institute for Water Research (ICRA), Emili Grahit 101, Edifici H2O, Parc Científic I Tecnològic de la Univers...

Water-dispersible alkyne-bearing conjugated microporous poly-benzothiadiazoles were synthesized using thiol-yne chemistry to enhance water compatibility. The water compatible polymer networks were used as heterogeneous photocatalysts to generate singlet oxygen for the conversion of furoic acid to 5-hydroxy-2(5H)-furanone.