The degradation of 2,2′,4,4′-tetrabromodiphenyl ether(BDE-47) by Pycnoporus sanguineus was investigated in order to explore the impact of the heavy metal Cu2+ on BDE-47 decomposition and the subsequent formation of ...The degradation of 2,2′,4,4′-tetrabromodiphenyl ether(BDE-47) by Pycnoporus sanguineus was investigated in order to explore the impact of the heavy metal Cu2+ on BDE-47 decomposition and the subsequent formation of metabolites, as well as to further elucidate the degradation mechanism of BDE-47. An increase in degradation rate from 18.63% to49.76% in the first four days and its stabilization at(51.26 ± 0.08)% in the following days of BDE-47 incubation were observed. The presence of Cu2+ at 1 and 2 mg/L was found to promote the degradation rate to 56.41% and 60.79%, respectively, whereas higher level of Cu2+(≥ 5 mg/L) inhibited the removal of BDE-47. The similar concentration effects of Cu2+ was also found on contents of fungal protein and amounts of metabolites. Both intracellular and extracellular enzymes played certain roles in BDE-47 transportation with the best degradation rate at 27.90% and 27.67% on the fourth and third day, individually. During the degradation of BDE-47, four types of hydroxylated polybrominated diphenyl ethers(OH-PBDEs), i.e., 6′-OH-BDE-47, 5′-OH-BDE-47, 4′-OH-BDE-17, 2′-OH-BDE-28, and two bromophenols, i.e., 2,4-DBP and 4-BP were detected and considered as degradation products. These metabolites were further removed by P. sanguineus at rates of 22.42%,23.01%, 27.04%, 27.96%, 64.21%, and 40.62%, respectively.展开更多
Have you ever wondered what happened to that old cell phone you threw out last month?How about the 150 million other cell phones that were also disposed of in the past year?Although the world population has doubled in...Have you ever wondered what happened to that old cell phone you threw out last month?How about the 150 million other cell phones that were also disposed of in the past year?Although the world population has doubled in the past 50 years,global consumption of electronic devices has increased six fold(Belkhir and Elmeligi,2018)with nearly 45 million tonnes of electronic waste(e-waste)being produced in 2016 alone(Balde et al.,2017).That equates to 6.1 kg of e-waste per person across the globe and is equivalent in weight to over four thousand Eiffel towers(Balde et al.,2017)!展开更多
A phylogenetic analysis of Trametes and related taxa is proposed,based on a wide sampling of temperate and tropical species.Concatenate sequences of ribosomal DNA(ITS1-5.8S-ITS2)and RPB2 gene from mycelia cultures wer...A phylogenetic analysis of Trametes and related taxa is proposed,based on a wide sampling of temperate and tropical species.Concatenate sequences of ribosomal DNA(ITS1-5.8S-ITS2)and RPB2 gene from mycelia cultures were analyzed by Maximum Likelihood and Bayesian methods,whilst morphological features were documented from the corresponding herbarium vouchers.Congruent results were obtained from analyses of ribosomal LSU sequences downloaded from Genbank.The Bayesian analysis of ITS+RPB2 sequences gave the best resolution for the phylogenetic reconstructions and revealed the existence of three main lineages in the Trametes-clade:1)a monospecific lineage represented by Artolenzites elegans 2)a lineage including the genus Pycnoporus in its traditional sense and several species usually classified in the genus Trametes(T.cingulata,T.lactinea,T.ljubarskyi,T.menziesii)&3)a lineage corresponding to the core genus Trametes,including type species of Trametes,Coriolopsis and Lenzites.The presence of a pseudostipe,aspect and structure of the abhymenial surface,colour change with 5%aqueous solutions of potassium hydroxide and topography of pigments on skeletal hyphae gave relevant morphological support to these clades.When the structure of the hymenial surface,presence of a black line below the tomentum and color of context(except for genus Pycnoporus)usually used in traditional polypore-classifications did not reveal any phylogenetic significance.A partial systematic arrangement of the Trametes clade is proposed,with the introduction of a new genus:Leiotrametes Welti&Courtec.gen.nov..Two new combinations:Leiotrametes lactinea(Berk.)Welti&Courtec.comb.nov.and L.menziesii(Berk.)Welti&Courtec.comb.nov.are proposed.展开更多
The transformation profiles of polycyclic aromatic hydrocarbons （PAHs） by pure laccases from Trametes versicolor and Pycnoporus sanguineus, and the optimal reaction conditions （acetonitrile concentration, pH, tempe...The transformation profiles of polycyclic aromatic hydrocarbons （PAHs） by pure laccases from Trametes versicolor and Pycnoporus sanguineus, and the optimal reaction conditions （acetonitrile concentration, pH, temperature and incubation time） were determined. Anthracene was the most transformable PAH by both laccases, followed by benzo[a]pyrene, and benzo[a]anthracene. Laccase-mediator system （LMS） could not only improve the PAH oxidation but also extend the substrate types compared to laccase alone. 5e/0 or 10~ （v/v） of acetonitrile concentration, pH 4, temperature of 40 ~C, and incubation time of 24 h were most favorable for anthracene oxidation by laccase from T. versicolor or P. sanguineus. The gas chromatography-mass spectrometry analysis indicated that 9,10- anthraquinone was the main product of anthracene transformed by laccase from T. versicolor. Microtox test results showed that both anthracene and its laccase-transformation products were not acute toxic compounds, suggesting that laccase-treatment of anthracene would not increase the acute toxicity of contaminated site.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U1501234,41673091,41573091)the National Key Research and Development Program of China(No.2018YFC1802800)
文摘The degradation of 2,2′,4,4′-tetrabromodiphenyl ether(BDE-47) by Pycnoporus sanguineus was investigated in order to explore the impact of the heavy metal Cu2+ on BDE-47 decomposition and the subsequent formation of metabolites, as well as to further elucidate the degradation mechanism of BDE-47. An increase in degradation rate from 18.63% to49.76% in the first four days and its stabilization at(51.26 ± 0.08)% in the following days of BDE-47 incubation were observed. The presence of Cu2+ at 1 and 2 mg/L was found to promote the degradation rate to 56.41% and 60.79%, respectively, whereas higher level of Cu2+(≥ 5 mg/L) inhibited the removal of BDE-47. The similar concentration effects of Cu2+ was also found on contents of fungal protein and amounts of metabolites. Both intracellular and extracellular enzymes played certain roles in BDE-47 transportation with the best degradation rate at 27.90% and 27.67% on the fourth and third day, individually. During the degradation of BDE-47, four types of hydroxylated polybrominated diphenyl ethers(OH-PBDEs), i.e., 6′-OH-BDE-47, 5′-OH-BDE-47, 4′-OH-BDE-17, 2′-OH-BDE-28, and two bromophenols, i.e., 2,4-DBP and 4-BP were detected and considered as degradation products. These metabolites were further removed by P. sanguineus at rates of 22.42%,23.01%, 27.04%, 27.96%, 64.21%, and 40.62%, respectively.
基金Alberta Health,Alberta Innovates,the Canadian Institutes of Health Researchthe Natural Sciences and Engineering Research Council of Canadathe National Natural Science Foundation of China(Nos.21520102009,21836003 and 21621005)for their support
文摘Have you ever wondered what happened to that old cell phone you threw out last month?How about the 150 million other cell phones that were also disposed of in the past year?Although the world population has doubled in the past 50 years,global consumption of electronic devices has increased six fold(Belkhir and Elmeligi,2018)with nearly 45 million tonnes of electronic waste(e-waste)being produced in 2016 alone(Balde et al.,2017).That equates to 6.1 kg of e-waste per person across the globe and is equivalent in weight to over four thousand Eiffel towers(Balde et al.,2017)!
基金The authors are grateful to the European Union through the EMbaRC project(FP7 Programme,2008-2012,Research Infrastructures action)under grant agreement Number FP7-228310,for funding this work and giving access to some culture strains from KNAW-CBS collection(Joast Stalpers&Gerard Verkley).
文摘A phylogenetic analysis of Trametes and related taxa is proposed,based on a wide sampling of temperate and tropical species.Concatenate sequences of ribosomal DNA(ITS1-5.8S-ITS2)and RPB2 gene from mycelia cultures were analyzed by Maximum Likelihood and Bayesian methods,whilst morphological features were documented from the corresponding herbarium vouchers.Congruent results were obtained from analyses of ribosomal LSU sequences downloaded from Genbank.The Bayesian analysis of ITS+RPB2 sequences gave the best resolution for the phylogenetic reconstructions and revealed the existence of three main lineages in the Trametes-clade:1)a monospecific lineage represented by Artolenzites elegans 2)a lineage including the genus Pycnoporus in its traditional sense and several species usually classified in the genus Trametes(T.cingulata,T.lactinea,T.ljubarskyi,T.menziesii)&3)a lineage corresponding to the core genus Trametes,including type species of Trametes,Coriolopsis and Lenzites.The presence of a pseudostipe,aspect and structure of the abhymenial surface,colour change with 5%aqueous solutions of potassium hydroxide and topography of pigments on skeletal hyphae gave relevant morphological support to these clades.When the structure of the hymenial surface,presence of a black line below the tomentum and color of context(except for genus Pycnoporus)usually used in traditional polypore-classifications did not reveal any phylogenetic significance.A partial systematic arrangement of the Trametes clade is proposed,with the introduction of a new genus:Leiotrametes Welti&Courtec.gen.nov..Two new combinations:Leiotrametes lactinea(Berk.)Welti&Courtec.comb.nov.and L.menziesii(Berk.)Welti&Courtec.comb.nov.are proposed.
基金Supported by the National High-Tech R&D Program of China(No.2007AA061101)the Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciencesthe Zhejiang Provincial Natural Science Foundation of China(No.Y5110147)
文摘The transformation profiles of polycyclic aromatic hydrocarbons （PAHs） by pure laccases from Trametes versicolor and Pycnoporus sanguineus, and the optimal reaction conditions （acetonitrile concentration, pH, temperature and incubation time） were determined. Anthracene was the most transformable PAH by both laccases, followed by benzo[a]pyrene, and benzo[a]anthracene. Laccase-mediator system （LMS） could not only improve the PAH oxidation but also extend the substrate types compared to laccase alone. 5e/0 or 10~ （v/v） of acetonitrile concentration, pH 4, temperature of 40 ~C, and incubation time of 24 h were most favorable for anthracene oxidation by laccase from T. versicolor or P. sanguineus. The gas chromatography-mass spectrometry analysis indicated that 9,10- anthraquinone was the main product of anthracene transformed by laccase from T. versicolor. Microtox test results showed that both anthracene and its laccase-transformation products were not acute toxic compounds, suggesting that laccase-treatment of anthracene would not increase the acute toxicity of contaminated site.
