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Hypoxic and temporal variation in the endocrine disrupting toxicity of perfluorobutanesulfonate in marine medaka(Oryzias melastigma)

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Journal of Environmental sciences 2024年第2期136卷 279-291页

作者： Baili sun Jing Li Yachen Bai Xiangzhen Zhou paul k.s.Lam Lianguo Chen state key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of sciences Beijing 100049China Office of the President Hong Kong Metropolitan University30 Good Shepherd StreetKowloonHong Kong SARChina

Perfluorobutanesulfonate(PFBs)is an emerging pollutant capable of potently disrupting the sex and thyroid endocrine systems of ***,the hypoxic and temporal variation in PFBs endocrine disrupting toxicity remain largely *** the present study,adult marine medaka were exposed to environmentally realistic concentrations of PFBs(0 and 10μg/L)under normoxia or hypoxia conditions for 7 days,aiming to explore the interactive behavior between PFBs and *** addition,PFBs singular exposure was extended till 21days under normoxia to elucidate the time-course progression in PFBs *** results showed that hypoxia inhibited the growth and caused the suspension of egg spawn regardless of PFBs *** regard to the sex endocrine system,7-day PFBs exposure led to an acute stimulation of transcriptional profiles in females,which,subsequently,recovered after the 21-day *** potency of hypoxia to disturb the sex hormones was much stronger than PFBs.A remarkable increase in estradiol concentration was noted in medaka blood after hypoxia *** in sex endocrinology of coexposed fish were largely determined by hypoxia,which drove the formation of an estrogenic *** further enhanced the endocrine disrupting effects of ***,the hepatic synthesis of vitellogenin and choriogenin,two commonly used sensitive biomarkers of estrogenic activity,failed to initiate in response to the estrogen *** to sex endocrine system,disturbances in thyroidal axis by PFBs or hypoxia were relatively ***,the present findings will advance our toxicological understanding about PFBs pollutant under the interference of hypoxia.

关键词： Perfluorobutanesulfonate(PFBs) Aquatic hypoxia Temporal toxicity Combined exposure Endocrine disruption Marine medaka

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Intense violet-blue emission and paramagnetism of nanocrystalline Gd^(3+) doped ZnO ceramics

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Journal of Advanced Ceramics 2015年第4期4卷 300-306页

作者： s.sAMBAsIVAM D.paul JOsEPH s.AsIRI NAIDU k.N.HUI k.s.HUI B.C.CHOI Department of Physics Pukyong National UniversityBusan 608-737Republic of Korea Department of Physics Velammal Institute of TechnologyChennai 601204India Department of Physics National Institute of TechnologyWarangalTelangana 506004India Rajiv Gandhi University of knowledge Technologies NuzvidAndhra Pradesh 521201India Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacaoChina Department of Mechanical Convergence Engineering Hanyang University17 Haengdang-dongSeongdong-guSeoul 133-791Republic of Korea

Nanocrystalline Zn1-xGdxO(x=0,0.02,0.04,0.06,and 0.08)ceramics were synthesized by ball milling and subsequent solid-state *** transmission electron microscopy(TEM)micrograph of as synthesized samples revealed the formation of crystallites with an average diameter of 60 nm,and the selected area electron diffraction(sAED)pattern confirmed the formation of wurtzite structure.A red shift in the band gap was observed with increasing Gd^(3+)*** photoluminescence of nanocrystalline Gd^(3+)doped ZnO exhibited a strong violet-blue *** dependence of the emission intensity of Gd^(3+)in ZnO was studied,and the critical concentration was found to be 4 mol%of Gd^(3+).The Gd^(3+)doped ZnO exhibited paramagnetic behavior at room temperature,and the magnetic moment increased with Gd^(3+)concentration.

关键词： X-ray diffraction(XRD) nano-ceramics rare earth element semiconductors

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Active catalytic species generated in situ in zirconia incorporated hydrogen storage material magnesium hydride

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Journal of Magnesium and Alloys 2022年第3期10卷 852-861页

作者： D.Pukazhselvan k.s.sandhya Devaraj Ramasamy Aliaksandr shaula Igor Bdikin Duncan paul Fagg Department of Mechanical Engineering Nanoengineering Research GroupCentre for Mechanical Technology and Automation(TEMA)University of AveiroAveiro 3810-193Portugal Department of Chemistry Malankara Catholic CollegeKaliyakkavilaiTamil Nadu 629153India Department of Computational Biology and Bioinformatics University of KeralaThiruvananthapuramKerala 695581India UIDM ESTGPolytechnic Institute of Viana do CasteloViana do Castelo 4900Portugal

This study explores how zirconia additive interacts with MgH_(2)to improve its hydrogen storage *** it is confirmed that the zirconia added MgH_(2)powder releases hydrogen at a temperature of about 50℃below that of the additive free MgH_(2).subsequent tests by X ray diffraction(XRD)and infrared(IR)spectroscopy techniques reveal that the ZrO_(2) mixed MgH_(2)powder contains ZrHx(21.5)and MgO secondary *** observation is supported by the negative Gibbs free energy values obtained for the formation of ZrH_(2)/MgO from ZrO_(2)/MgH_(2)powder *** X ray photoelectron spectroscopy(XPs)study reveals that apart from Zr^(4+)cations,Zr^(2+) and zero valent Zr exist in the *** force microscopy(AFM)study reveals that the average grain size is 20 nm and the elemental line scan profiles further proves the existence of oxygen deficient Zr bearing phase(s).This study strengthens the belief that functional metal oxide additives in fact chemically interact with MgH_(2)to make active in-situ catalysts in the MgH_(2)system.

关键词： Hydrogen storage Binary hydrides Metal oxides Additives Nanocatalysis.

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Microbiota-host interplay at the gut epithelial level,health and nutrition

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Journal of Animal science and Biotechnology 2017年第2期8卷 327-334页

作者： Jean-paul Lallès Division of Human Nutrition Division INRA Clermont-Ferrand France Human Nutrition Research Center-West Nantes France

Growing evidence suggests the implication of the gut microbiota in various facets of health and disease. In this review, the focus is put on microbiota-host molecular cross-talk at the gut epithelial level with special emphasis on two defense systems： intestinal alkaline phosphatase（IAP） and inducible heat shock proteins（iHsPs）. Both IAP and iHsPs are induced by various microbial structural components（e.g. lipopolysaccharide, flagellin, CpG DNA motifs）,metabolites（e.g. n-butyrate） or secreted signal molecules（e.g., toxins, various peptides, polyphosphate）. IAP is produced in the small intestine and secreted into the lumen and in the interior milieu. It detoxifies microbial components by dephosphorylation and, therefore, down-regulates microbe-induced inflammation mainly by inhibiting NF-κB pro-inflammatory pathway in enterocytes. IAP gene expression and enzyme activity are influenced by the gut microbiota. Conversely, IAP controls gut microbiota composition both directly, and indirectly though the detoxification of pro-inflammatory free luminal adenosine triphosphate and inflammation inhibition. Inducible HsPs are expressed by gut epithelial cells in proportion to the microbial load along the gastro-intestinal tract. They are also induced by various microbial components, metabolites and secreted molecules. Whether iHsPs contribute to shape the gut microbiota is presently unknown. Both systems display strong anti-inflammatory and anti-oxidant properties that are protective to the gut and the host. Importantly, epithelial gene expressions and protein concentrations of IAP and iHsPs can be stimulated by probiotics, prebiotics and a large variety of dietary components, including macronutrients（protein and amino acids, especially L-glutamine, fat, fiber）, and specific minerals（e.g. calcium）and vitamins（e.g. vitamins k1 and k2）. some food components（e.g. lectins, soybean proteins, various polyphenols） may inhibit or disturb these systems. The general cel ular and molecula

关键词： Diet Gut Inducible heat shock protein Inflammation Intestinal alkaline phosphatase Microbiota

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一种适于碳纳米管制备的绿色前驱体(英文)

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新型炭材料 2011年第2期26卷 85-88页

作者： s.paul s.k.samdarshi Department of Energy Tezpur University

根据绿色化学原理尝试探索一种合成多壁碳纳米管的天然可再生前驱体。应用化学气相沉积(CVD)法,采用一种天然可再生前躯体(椰仁油),通过系列步骤合成了MW CNTs。氮气既作为气化前驱体载气(气体流速:100mL/m in)又维持合成在惰性氛围中... 详细信息

根据绿色化学原理尝试探索一种合成多壁碳纳米管的天然可再生前驱体。应用化学气相沉积(CVD)法,采用一种天然可再生前躯体(椰仁油),通过系列步骤合成了MW CNTs。氮气既作为气化前驱体载气(气体流速:100mL/m in)又维持合成在惰性氛围中进行。合成的MW CNTs使用sEM、EDX、TEM和Ram an表征,最佳条件下得到的碳纳米管直径为80nm～90nm。

关键词：椰仁油天然可再生前躯体碳纳米管 CVD

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椰子油制炭微管

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新型炭材料 2010年第5期25卷 325-328页

作者： s.paul s.k.samdarshi solar and Energy Materials Lab Department of EnergyTezpur University

报道了采用可再生的天然前驱体(椰子油),通过化学气相沉积制备一种"高长径比"的新型碳管结构,炭微管(CMTs)的方法。CMTs合成工艺:N2气氛,合成温度1175℃,流速100mL/min,二茂铁为催化剂。合成的CMTs利用sEM,EDX,TEM,和Raman光谱表征。结... 详细信息

报道了采用可再生的天然前驱体(椰子油),通过化学气相沉积制备一种"高长径比"的新型碳管结构,炭微管(CMTs)的方法。CMTs合成工艺:N2气氛,合成温度1175℃,流速100mL/min,二茂铁为催化剂。合成的CMTs利用sEM,EDX,TEM,和Raman光谱表征。结果表明:合成的CMTs的直径为1.7μm～2.1μm,并具有高的长径比。

关键词：炭微管化学气相沉积天然可再生前驱体

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Development of FBMINC model for particle diffusion in fluids

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International Journal of sediment Research 2009年第4期24卷 439-454页

作者： paul s ADDIsION CardioDigital Ltd Elvingston Science Centre

An accurate particle tracking method using FBMINC (new fractional Brownian motion) is outlined. It generates non-Fickian diffusion rather than Fickian diffusion as traditional particle tracking model does. The FBMINC model is based on fractional Brownian motion (fBm) which is generalization of regular Brownian motion. The two models of fBms (FBM model and FBMINC model) were explored and the differences of the two models are compared from the three aspects: the standard deviation of each step, the small memory and the effect of the number of particles in the cloud. The results show the FBMINC model is a better model as it produces more accurate statistics. The effect of simple shear dispersion for both Brownian and fBm was investigated. The power law scaling of fBm shear dispersion was correctly identified. In addition, a scaling coefficient was found numerically. The FBMINC model is then used for producing both superdiffusive and subdiffusive particle paths, therefore, the non-Fickian diffusion of soil particle clouds can be modelled. The particle clouds represent soil contaminant are released in an idealised coastal bay and the fBm particle tracking method is used for simulation the particle cloud spreading in the bay. There is a noticeable increase in the spreading rate of the cloud. In addition, owning to the spreading rate of the cloud, a noticeable part of it has escaped the bay area and transported downstream. The variation of the Hurst exponent can lead to an area of the flow being affected by a contaminant cloud which is not picked up by the regular Brownian motion models. The purpose of this paper is to bring soil transport engineers a new angle on soil particle transport research in fluids. Using FBMINC particle tracking model allows more flexibility in simulation of diffusion in soil contaminant spread in coastal bay or ocean surface.

关键词： Random walk Fractional Brownian motion Particle tracking soil contaminant spread

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Mutations around interferon sensitivity-determining region:A pilot resistance report of hepatitis C virus 1b in a Hong kong population

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World Journal of Gastroenterology 2011年第48期17卷 5317-5323页

作者： Xiao-Ming Zhou paul ks chan John s Tam Department of Epidemiology Shanghai Public Health Clinical Center Fudan University Shanghai 201508China Department of Microbiology The Chinese University ofHong Kong Shatin Hong Kong China World Health Organization Geneva 1200 Switzerland

AIM： To explore mutations around the interferon sensitivity-determining region （IsDR） which are associated with the resistance of hepatitis C virus lb （HCV-lb） to interferon-α treatment. METHODs： Thirty-seven HCV-lb samples were obtained from Hong kong patients who had completed the combined interferon-α/ribavirin treatment for more than one year with available response data. Nineteen of them were sustained virological responders, while 18 were non-responders. The amino acid sequences of the extended IsDR （eIsDR） covering 64 amino acids upstream and 67 amino acids downstream from the previously reported IsDR were analyzed. REsULTs： One amino acid variation （I2268V, P = 0.023） was significantly correlated with treatment outcome in this pilot study with a limited number of patients, while two amino acid variations （R2260H, P = 0.05 and $2278T, P = 0.05） were weakly associated with treat- ment outcome. The extent of amino acid variations within the IsDR or eIsDR was not correlated with treat- ment outcome as previously reported. CONCLUsION： Three amino acid mutations near but outside of IsDR may associate with interferon treatment resistance of HCV-lb patients in Hong kong.

关键词： Hepatitis C virus lb Extended interferon sen-sitivity-determining region Interferon-R Resistance Hongkong Mutation

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Granular activated carbons from palm nut shells for gold di-cyanide adsorption

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 172-179页

作者： William k.Buah paul T.Williams Energy Research Institute The University of LeedsLeeds LS2 9JTUnited Kingdom

Granular activated carbons were produced from palm nut shells by physical activation with steam. The proximate analysis of palm nut shells was investigated by thermogravimetric analysis, and the adsorption capacity of the activated carbons, produced as a result of shell pyrolysis at 600℃ followed by steam activation at 900℃ in varying activation times, was evaluated using nitrogen adsorption at 77 k. Applicability of the activated carbons for gold dicyanide adsorption was also investigated. Increasing the activation hold time with the attendant increase in the degree of carbon burn-off results in a progressive increase in the surface area of the activated carbons, reaching a value of 903.1 m2/g after activation for 6 h. The volumes of total pores, mieropores, and mesopores in the activated carbons also increase progressively with the increasing degree of carbon burn-off, resulting from increasing the activation hold time. The gold di-cyanide adsorption of the activated carbons increases with the rise of pore volume of the activated carbons. The gold di-cyanide adsorption of palm nut shell activated carbon obtained after 6-h activation at 900℃ is superior to that of a commercial activated carbon used for gold di-cyanide adsorption.

关键词： activated carbon adsorption gold cyanides processing pyrolysis

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Trilobite Biostratigraphy of the lower Paleozoic(Cambrian–Ordovician)Joseon supergroup,Taebaeksan Basin,korea

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Acta Geologica sinica(English Edition) 2016年第6期90卷 1976-1999页

作者： CHOI Duck k LEE Jeong Gu LEE seung-Bae PARk,Tae-Yoon s. HONG paul s. Research Institute of Basic sciences Seoul National UniversitySeoul 151-747Korea Ministry of science ICTand Future PlanningGwacheon 427-700Korea korea Institute of Geoscience and Mineral Resources Daejeon 305-350Korea korea Polar Research Institute Incheon 406-840Korea

In korea, trilobites are among the most intensively studied fossil groups in the past century and provide invaluable information about lower Paleozoic stratigraphy, paleogeography, and tectonics of the korean Peninsula. Trilobites occur in the lower Paleozoic Joseon supergroup of the Taebaeksan Basin which was part of the sino-korean Craton in the Paleozoic. The Joseon supergroup is divided into the Taebaek, Yeongwol, and Mungyeong groups. The Taebaek and Yeongwol groups are richly fossiliferous, while the Mungyeong Group is poorly fossiliferous. Contrasting trilobite faunal contents of the Taebaek and Yeongwol groups resulted in two separate biostratigraphic schemes for the Cambrian–Ordovician of the Taebaeksan Basin. A total of 22 biozones or fossiliferous horizons were recognized in the Taebaek Group; 19 zones were established in the Yeongwol Group; and four biozones were known from the Mungyeong Group. These trilobite biozones of the Taebaeksan Basin indicate the Joseon supergroup ranges in age from the Cambrian series 2 to Middle Ordovician and can be correlated well with the formations of North China, south China, and Australia.

关键词： Trilobites biostratigraphy Cambrian–Ordovician Taebaeksan Basin

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