Biodegradation of Tributyltin (TBT) by Extremophile Bacteria from Atacama Desert and Speciation of Tin By-products.

Biodegradation of tributyltin (TBT) by four tin resistant Gram negative bacteria isolated from extremely contaminated river sediments in the Atacama Desert in Chile was studied. Moraxella osloensis showed the greatest resistance and degradation capability of TBT, producing less toxic by-products, such as dibutyltin (DBT) and inorganic tin. In 7 days, approximately 80 % of TBT degradation was achieved, generating close to 20 % of DBT as degradation product.

Kinetic study of imidacloprid removal by advanced oxidation based on photo-Fenton process.

In this paper, the kinetics of Imidacloprid removal from aqueous solution by photo-Fenton processes is presented. Experiments were conducted in batch mode, using a two litre jacketed Pyrex glass reactor, fitted with magnetic stirring, and six 6 W black light fluorescent lamps (lambdamax 365 nm), arranged in parallel to the reactor axis. The effect of initial Fe(II) concentration (< 0.

In vitro and in vivo activity of Melaleuca alternifolia mixed with tissue conditioner on Candida albicans.

Objective: The aim of this study was to identify in vitro and in vivo activity of Melaleuca alternifolia oil mixed with different tissue conditioners on the Candida albicans strain.

Study Design: Microbiological tests were used to isolate Candida albicans from patients with denture stomatitis. The in vitro antifungal activity of Melaleuca alternifolia against Candida albicans was determined when it was applied directly and when it was mixed with tissue conditioners (Fitt, Lynal, Coe-Comfort).

Imidacloprid oxidation by photo-Fenton reaction.

This paper presents experimental results on the imidacloprid removal from wastewater using homogeneous photo-Fenton reactions illuminated with black light lamps. Multivariate experimental design was used to identify the effect of initial Fe(II) and H(2)O(2) concentrations on process performance. The initial iron concentration played a key role in the process kinetics, whereas hydrogen peroxide concentration directly affected the extent of the oxidation process.

Combined physical-chemical and biological treatment of poorly biodegradable industrial effluents.

Effluents from small and medium sized chemical plants may contain significant amounts of poorly biodegradable aromatic compounds, which could negatively affect water quality and public health. This is a key environmental issue, particularly in areas where effluents are discharged into drinking water sources. Unfortunately, conventional biological treatment may not be able to meet discharge standards, and combined systems should be implemented.