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Interfacial processes and mechanisms of synergistic degradation of dichlorobiphenyl by white rot fungi and magnetite nanoparticles

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Science China Earth Sciences 2023年第9期66卷 2057-2065页

作者： Le CHANG guanghui yu Congqiang LIU Institute of Surface-Earth System Science School of Earth System ScienceTianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai RimBohai Coastal Critical Zone National Observation and Research StationTianjin UniversityTianjin 300072China

The rapid increase in the artificial syntheses of organic pollutants has raised widespread ***,the mechanisms by which fungi degrade these new organic pollutants in the environment and adapt to environmental stressors remain *** this study,Phanerochaete chrysosporium,a model white rot fungus,was used to explore the interfacial processes and mechanisms for synergistic degradation of 4,4′-dichlorobiphenyl(PCB15)with magnetite *** results showed that after 3 and 5 days of cultivation with Phanerochaete chrysosporium alone,the rates for PCB15 degradation were 32%and 65%,respectively,indicating that the white rot fungus itself was able to degrade the organic ***,the addition of magnetite nanoparticles significantly enhanced the degradation of PCB15 by Phanerochaete *** cocultivation for 3 and 5 days,the rates for PCB15 degradation increased to 42%and 84%,*** radiation-based Fourier transform infrared spectromicroscopy(SR-FTIR)showed that the magnetite particles were tightly adhered to the fungal hyphae and were unevenly distributed on the hyphal ***,cocultivation of the fungus and magnetite nanoparticles significantly enhanced the nanozymatic activity of magnetite.A linear regression model provided a significantly negative correlation(r=−0.96,p<0.001)between the nanozymatic activity of the magnetite and the concentration ratio of the PCB15,supporting the hypothesis that white rot fungi degraded the PCB15 by enhancing the nanozyme activity of ***-resolution X-ray photoelectron spectroscopy(XPS)revealed that the nanozymatic activity of magnetite was mainly governed by oxygen vacancies on the mineral surfaces rather than the iron ***,these findings increase our understanding of the powerful capabilities of fungi in terms of stress resistance and adaptation to extreme environments and provide new insights into fungal-mediated degradation of organic po

关键词： Magnetite nanoparticles Nanozymes Oxygen vacancies White rot fungi X-ray photoelectron spectroscopy Synchrotron radiation based FTIR spectromicroscopy Dichlorobiphenyl

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The Dominant Glutamic Acid Metabolic Flux to Produce γ-Amino Butyric Acid over Proline in Nicotiana tabacum Leaves under Water Stress Relates to its Significant Role in Antioxidant Activity

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Journal of Integrative Plant Biology 2011年第8期53卷 608-618页

作者： Cuili Liu Li Zhao guanghui yu Key Laboratory for Biotechnology of the State Ethnic Affairs Commission College of Life Sciences South-Central University for Nationalities Wuhan 430074 China

γ-Amino butyric acid （GABA） and proline play a crucial role in protecting plants during various environmental stresses. Their synthesis is from the common precursor glutamic acid, which is catalyzed by glutamate decarboxylase and △1-pyrroline-5-carboxylate synthetase respectively. However, the dominant pathway under water stress has not yet been established. To explore this, excised tobacco leaves were used to simulate a water-stress condition. The results showed GABA content was much higher than that of proline in leaves under water-deficit and non-water-deficit conditions. Specifically, the amount of GABA significantly increased compared to proline under continuous water loss for 16 h, indicating that GABA biosynthesis is the dominant pathway from glutamic acid metabolism under these conditions. Quantitative reverse transcription polymerase chain reaction and protein Western gel-blot analysis further confirmed this. To explore the function of GABA accumulation, a system producing superoxide anion （O 2 - ）, peroxide hydrogen （H 2 O 2 ）, and singlet oxygen （ 1 O 2 ） was employed to investigate the scavenging role on free-radical production. The results demonstrated that the scavenging ability of GABA for O 2 - , H 2 O 2 , and 1 O 2 was significantly higher than that of proline. This indicated that GABA acts as an effective osmolyte to reduce the production of reactive oxygen species under water stress.

关键词： glutamic acid proline reactive oxygen species water stress γ-amino butyric acid.

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Effect of ultrasonic pretreatment on anaerobic digestion and its sludge dewaterability

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Journal of Environmental Sciences 2011年第9期23卷 1472-1478页

作者： Huacheng Xu Pinjing He guanghui yu Liming Shao State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water Environment College of Environmental Science and Engineering Tongji University Shanghai 200092 China

To investigate the effect of ultrasonic pretreatment on anaerobic digestion and sludge dewaterability and further to probe into the influencing factors on sludge dewaterability,sludge flocs were stratified into four fractions：（1） slime;（2） loosely bound extracellular polymeric substances （LB-EPS）;（3） tightly bound EPS （TB-EPS）;and （4） EPS-free *** results showed that ultrasonic pretreatment increased the anaerobic digestion efficiency by 7%–8%.Anaerobic digestion without ultrasonic pretreatment deteriorated the sludge dewaterability,with the capillary suction time （CST） increased from 1.42 to 47.3 （sec·L）/*** application of ultrasonic pretreatment firstly deteriorated the sludge dewaterability （normalized CST increased to 44.4 （sec·L）/g-TSS）,while subsequent anaerobic digestion offset this effect and ultimately decreased the normalized CST to 23.2 （sec·L）/*** dewaterability of unsonicated sludge correlated with protein （p = 0.003） and polysaccharide （p = 0.004） concentrations in the slime fraction,while that of sonicated sludge correlated with protein concentrations in the slime and LB-EPS fractions （p 0.05）.Fluorescent excitationemission matrix analysis showed that the fluorescence matters in the LB-EPS fraction significantly correlated with sludge dewaterability during anarobic digestion.

关键词： anaerobic digestion capillary suction time extracellular polymeric substances sludge dewaterability ultrasonic pretreatment

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Effects of ultrasonic pretreatment on sludge dewaterability and extracellular polymeric substances distribution in mesophilic anaerobic digestion

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Journal of Environmental Sciences 2010年第3期22卷 474-480页

作者： Liming Shao Guanzhao Wang Huacheng Xu guanghui yu Pinjing He State Key Laboratory of Pollution Control and Resources Reuse Shanghai 200092 China. Key Laboratory of Yangtze River Water Environment Shanghai 200092 China College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Effect of ultrasonic pretreatment on sludge dewaterability was determined and the fate of extracellular polymeric substances （EPS） matrix in mesophilic anaerobic digestion after ultrasonic pretreatment was studied. Characteristics of proteins （PN）, polysaccharides （PS）, excitation-emission matrix （EEM） fluorescence spectroscopy and molecular weight （MW） distribution of dissolved organic matters （DOM） in different EPS fractions were evaluated. The results showed that after ultrasonic pretreatment, the normalized capillary suction time （CST） decreased from 44.4 to 11.1 （sec·L）/g total suspended solids （TSS） during anaerobic digestion, indicating that sludge dewaterability was greatly improved. The normalized CST was significantly correlated with PN concentration （R2 = 0.92, p 〈 0.01） and the PN/PS ratio （R2 = 0.84, p 〈 0.01） in the loosely bound EPS （LB-EPS） fraction. Meanwhile, the average MW of DOM in the LB- EPS and tightly bound EPS （TB-EPS） fractions also had a good correlation with the normalized CST （R2 〉 0.66, p 〈 0.01）. According to EEM fluorescence spectroscopy, tryptophan-like substances intensities in the slime, LB-EPS and TB-EPS fractions were correlated with the normalized CST. The organic matters in the EPS matrix played an important role in influencing sludge dewaterability.

关键词： anaerobic digestion excitation-emission matrix extracellular polymeric substances sludge dewaterability

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The language of GABA in pollen tube growth and guidance

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Frontiers in Biology 2008年第4期3卷 439-442页

作者： guanghui yu Yan CHEN Key Laboratory for Biotechnology of the State Ethnic Affairs Commission College of Life SciencesSouth-Central University for NationalitiesWuhan 430074China

The achievement of double fertilization in higher plants requires the successful transport of sperm cells to the female gametes,the *** tubes,the tubular structure protruding from pollens,carrying the sperms play an important role in this *** a pollen tube precisely guides its direction to gain its goal is of *** investigation indicated that multiple signal clues from the pistils function as the route signs to regulate the pathway of pollen tube *** the signal clues,c-aminobutyric acid(GABA)seems to be *** gradient concentration has been found both in tobacco and Arabidopsis pollen tube *** the communication of pollens and pistils,what on earth GABA tells pollen tubes is of great *** GABA receptors on the pollen membrane are thought to be the hinge in the language *** this review,the mechanism of GABA gradient formation is *** possible GABA receptor on the pollen membrane is examined and its function is *** decipher the possible language of GABA in pollen tube growth and guidance,multiple methods are *** combination of transcriptome and proteomics assay is expected to unveil the secret.

关键词： double fertilization c-aminobutyric acid(GABA)receptor pollen tube guidance signal transduction

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Codebook Design and Beam Training for Extremely Large-Scale RIS:Far-Field or Near-Field?

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China Communications 2022年第6期19卷 193-204页

作者： Xiuhong Wei Linglong Dai Yajun Zhao guanghui yu Xiangyang Duan Beijing National Research Center for Information Science and Technology(BNRist)as well as the Department of Electronic Engineering Tsinghua UniversityBeijing 100084China ZTE Corporation Shenzhen 518038China

Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G *** training is an effective way to acquire channel state information(CSI)for *** beam training schemes rely on the far-field ***,due to the large aperture of XL-RIS,the scatters are more likely to be in the near-field region of *** far-field codebook mismatches the near-field channel ***,the existing far-field beam training scheme will cause severe performance loss in the XL-RIS assisted nearfield *** solve this problem,we propose the efficient near-field beam training schemes by designing the near-field codebook to match the nearfield channel ***,we firstly design the near-field codebook by considering the near-field cascaded array steering vector of ***,the optimal codeword for XL-RIS is obtained by the exhausted training *** reduce the beam training overhead,we further design a hierarchical nearfield codebook and propose the corresponding hierarchical near-field beam training scheme,where different levels of sub-codebooks are searched in turn with reduced codebook *** results show the proposed near-field beam training schemes outperform the existing far-field beam training scheme.

关键词： extremely large-scale RIS near-field codebook design beam training

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Risk assessment and binding mechanisms of potentially toxic metals in sediments from different water levels in a coastal wetland

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Journal of Environmental Sciences 2023年第7期129卷 202-212页

作者： Fusheng Sun guanghui yu Xingxing Han Zhilai Chi yunchao Lang Congqiang Liu Institute of Surface-Earth System Science School of Earth System ScienceTianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai RimTianjin UniversityTianjin 300072China

The excessive accumulation of potentially toxic metals(Pb and Cd)in coastal wetlands is among the main factors threateningwetland ***,the effects ofwater table depth(WTD)on the risk and binding mechanisms of potentially toxic metals in sediments remain ***,sediments from different WTD obtained from a typical coastal wetland were evaluated using a newly developed strategy based on chemical extraction methods coupled with high-resolution *** findings indicated that the WTD of the coastal wetland fluctuates frequently and the average enrichment factor for Pb was categorized as minor,whereas Cd enrichment was categorized as ***-resolution spectroscopy techniques also demonstrated that organic functional groups and partly inorganic compounds(e.g.,Fe-O/Si-O)played a vital role in the binding of Pb and Cd to surface ***,mineral components rather than organic groups were mainly bound to thesemetals in the bottom ***,our findings provide key insights into the potential health effects and binding characteristics of potentially toxic metals in sediments,as well as their dynamic behavior under varying sediment depths at a microscale.

关键词： Coastal wetlands Wetland sediment Toxic metals Risk assessment Synchrotron radiation Binding mechanisms

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The phylogenetic status of typical Chinese native pigs: analyzed by Asian and European pig mitochondrial genome sequences

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Journal of Animal Science and Biotechnology 2013年第2期2013卷 145-151页

作者： guanghui yu Hai Xiang Jikun Wang Xingbo Zhao National Engineering Laboratory for Animal Breeding Ministry of Agricultural Key Laboratory of Animal Genetics Breeding and Reproduction State Key Laboratory for Agribiotechnology College of Animal Science and Technology China Agricultural University

China is one of the most diverse countries, which have developed 88 indigenous pig breeds. Several studies showed that pigs were independently domesticated in multiple regions of the world. The purpose of this study was to investigate the origin and evolution of Chinese pigs using complete mitochondrial genomic sequences (mtDNA) from Asian and European domestic pigs and wild boars. Thirty primer pairs were designed to determine the mtDNA sequences of Xiang pig, Large White, Lantang, Jinhua and Pietrain. The phylogenetic status of Chinese native pigs was investigated by comparing the mtDNA sequences of complete coding regions and D-loop regions respectively amongst Asian breeds, European breeds and wild boars. The analyzed results by two cluster methods contributed to the same conclusion that all pigs were classified into two major groups, European clade and Asian clade. It revealed that Chinese pigs were only recently diverged from each other and distinctly different from European pigs. Berkshire was clustered with Asian pigs and Chinese pigs were involved in the development of Berkshire breeding. The Malaysian wild boar had distant genetic relationship with European and Asian pigs. Jinhua and Lanyu pigs had more nucleotide diversity with Chinese pigs although they all belonged to the Asian major clade. Chinese domestic pigs were clustered with wild boars in Yangtze River region and South China.

关键词： Mitochondrial DNA Origin and evolution Phylogenetic analysis Pig

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Metabolism, signaling, and transport of jasmonates

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Plant Communications 2021年第5期2卷 78-91页

作者： Mengya Li guanghui yu Congli Cao Pei Liu Department of Ecology College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193P.R.China These authors contributed equally to this article

Biosynthesis/metabolism,perception/signaling,and transport are three essential aspects of the actions of ***(JAs),including jasmonic acid(JA)and related oxylipins,are implicated in the regulation of a range of ecological interactions,as well as developmental programs to integrate these ***-isoleucine(JA-Ile)is the most bioactive JAs,and perception of JA-Ile by its coreceptor,the Skp1-Cullin1-F-box-type(SCF)protein ubiquitin ligase complex SCF^(COI1)-JAZ,in the nucleus derepresses the transcriptional repression of target *** biosynthesis and metabolism of JAs occur in the plastid,peroxisome,cytosol,endoplasmic reticulum,and vacuole,whereas sensing of JA-Ile levels occurs in the *** is increasingly apparent that a number of transporters,particularly members of the jasmonates transporter(JAT)family,located at endomembranes as well as the plasma membrane,constitute a network for modulating and coordinating the metabolic flux and signaling of *** this review,we discuss recent advances in the metabolism,signaling,and especially the transport of JAs,focusing on intracellular compartmentation of these *** roles of transporter-mediated cell-cell transport in driving long-distance transport and signaling of JAs are also discussed.

关键词： jasmonates metabolism signaling transport cellular compartmentation

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Identification of superoxide dismutase isoenzymes in tobacco pollen

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Frontiers in Biology 2009年第4期4卷 442-445页

作者： Jing WANG Xuequn LIU guanghui yu Key Laboratory for Biotechnology of the State Ethnic Affairs Commission College of Life ScienceSouth-Central University for NationalitiesWuhan 430074China

We investigated the possible existence of superoxide dismutase(SOD;EC 1.***.1.1)isoenzymes in the pollen of Nicotiana tabacum(Petit Havana SR-1 cultivar).To detect SOD activity,crude extracts from tobacco pollen were subjected to native polyacrylamide gel electrophoresis followed by staining with nitroblue tetra-zolium(NBT).The presence of six SOD isoenzymes was detected in tobacco *** with SOD inhibitors indicated the presence of one manganese SOD(Mn SOD),five copper-zinc SOD(Cu/Zn SOD)isoenzymes,and the absence of iron SOD(Fe SOD).

关键词： tobacco pollen reactive oxygen species superoxide dismutase fertilization

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