Amazonian Dark Earths (ADE) are a unique type of soils developed through intense anthropogenic activities that transformed the original soils into Anthrosols throughout the Brazilian Amazon Basin. We conducted a comparative molecularlevel investigation of soil organic C (SOC) speciation in ADE (ages between 600 and 8700 years B.P.) and adjacent soils using ultraviolet photo-oxidation coupled wi...

Pseudomonas aeruginosa is a ubiquitous fluorescent, rod-shaped pseudomonad, with high metabolic capacity, and potential for application in processes to remove recalcitrant compounds such as petroleum hydrocarbons (PHC) from the environment. The bacterium persists sites highly selective pressures those contaminated by PHC. One of bacterium's strategies colonize biofilms which enhance its protect...

Sanitary landfill leachate (SLL) is a mixture of highly toxic and recalcitrant pollutants that threatens the water quality Yucatán Peninsula karst aquifer, one most extensive aquifers on planet. To reduce adverse environmental impacts this wastewater, triple-stage Fenton process (FP) was applied in an old SLL. Removal efficiencies were evaluated terms physicochemical variables, metal(oid)s conc...

Pure water, i.e., a sign of life, continuously circulates and is contaminated by different discharges. This emerging environmental problem has been attracting the attention scientists searching for methods treatment wastewater multiple recalcitrant compounds. Various physical chemical are used to degrade contaminants from water bodies. Traditional have certain limitations complexities bioenergy...

The effect of corn stover lignin structure alteration caused by white-rot fungi pretreatment on the pyrolysis kinetics was studied by FTIR and TG/DTA. Results showed that biopretreatment had a remarkable effect on lignin pyrolysis. Biopretreatment can decrease the activation energy and increase the pre-exponential factor in the initial stage of pyrolysis, which makes it possible to start the li...

Lignocellulose, which comprises the cell walls of plants, is the Earth’s most abundant renewable source of convertible biomass. However, in order to access the fermentable sugars of the cellulose and hemicellulose fraction, the extremely recalcitrant lignin heteropolymer must be hydrolyzed and removed—usually by harsh, costly thermochemical pretreatments. Biological processes for depolymerizing...

Molinate is a recalcitrant thiocarbamate used to control grass weeds in rice fields. The recently described molinate hydrolase, from Gulosibacter molinativorax ON4T, plays a key role in the only known molinate degradation pathway ending in the formation of innocuous compounds. Here we report the crystal structure of recombinant molinate hydrolase at 2.27 Å. The structure reveals a homotetramer ...

Advanced oxidation processes (AOP) are technologies based on the generation of highly reactive species, the hydroxyl radicals, used in oxidative degradation procedures for organic compounds dissolved or dispersed in aquatic media. These processes are promising alternatives for decontamination of media containing dissolved recalcitrant organic substances, which would not be efficiently removed b...

Earlier work with pure cultures had shown that the interaction of microbes with plasticizers leads to the formation of metabolites including 2-ethylhexanoic acid and 2-ethylhexanol that resist further degradation. The presence of these metabolites is now reported in a variety of environmental samples. Thus, even in a complex ecosystem, when plasticizers are degraded, the breakdown is not comple...