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Mercury in soil,vegetable and human hair in a typical mining area in China:Implication for human exposure

Journal of Environmental Sciences 2018年第6期30卷 73-82页

作者： Qin Jia Xuemei Zhu Yaqiong Hao Ziliang Yang Qi Wang Haihui Fu Hongjin Yu College of Water Sciences Beijing Normal University Research Institute of Solid Waste Management Chinese Research Academy of Environmental Sciences

Concentrations of total mercury（T-Hg） and methylmercury（MeHg） in soil, vegetables, and human hair were measured in a mercury mining area in central China. T-Hg and MeHg concentrations in soil ranged from 1.53 to 1054.97 mg/kg and 0.88 to 46.52 μg/kg, respectively.T-Hg concentrations was correlated with total organic carbon（TOC） content（R^2= 0.50, p〈0.01）and pH values（R^2= 0.21, p〈0.05）. A significant linear relationship was observed between MeHg concentrations and the abundance of sulfate-reducing bacteria（SRB）（R^2= 0.39, p〈0.05） in *** incubation experiments amended with specific microbial stimulants and inhibitors showed that Hg methylation was derived from SRB activity. T-Hg and MeHg concentrations in vegetables were 24.79 – 781.02 μg/kg and 0.01 – 0.18 μg/kg, respectively; levels in the edible parts were significantly higher than in the roots（T-Hg： p〈0.05; MeHg： p〈0.01）. Hg species concentrations in rhizosphere soil were positively correlated to those in vegetables（p〈0.01）, indicating that soil was an important source of Hg in vegetables. Risk assessment indicated that the consumption of vegetables could result in higher probable daily intake（PDI） of T-Hg than the provisional tolerable daily intake（PTDI） for both adults and children. In contrast, the PDI of MeHg was lower than the reference dose. T-Hg and MeHg concentrations in hair samples ranged from 1.57 to 12.61 mg/kg and 0.04 to 0.94 mg/kg, respectively, and MeHg concentration in hair positively related to PDI of MeHg via vegetable consumption（R^2= 0.39, p〈0.05）, suggesting that vegetable may pose health risk to local residents.

关键词： Mercury Methylmercury Soil Vegetable human hair

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Ultrastructural analysis shows persistence of adhesion and tight junction proteins in mature human hair

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BIOCELL 2021年第4期45卷 1013-1022页

作者： LORENZO ALIBARDI BERND NOECKER Comparative Histolab Padova and Department of Biology University of BolognaBologna40126Italy KAO Europe Research Laboratories Kao Germany GmbHDarmstadt64297Germany

The differentiation of cells composing mature human hairs produces layers with different corneous characteristics that would tend to flake away one from another,as in the corneous layer of the epidermis,without anchoring *** is likely that cell junctions established in the forming cells of the hair bulb are not completely degraded like in the corneous layer of the epidermis but instead remain in the hair shaft to bind mature cuticle,cortex,and medulla cells into a compact hair *** cell differentiation in hairs,cell junctions seem to disappear,and little is known about the fate of junctional proteins present in the mature human hair *** present ultrastructural immunogold study has detected some marker proteins of adhesion junction(cadherin and beta-catenin)and tight junctions(occludin and cingulin)that are still present in cornified hairs where numerous isopeptide bonds are detected,especially in the *** qualitative ultrastructural study indicates that aside from the cell membrane complex,a long corneo-desmosome bonding cortex and cuticle cells,also sparse adherens and tight junction remnants are *** is suggested that the cornification of these junctions with the incorporation of their proteins within the mature corneous material of the hair shaft likely contributes to maintaining the integrity of the mature *** information will also allow us to evaluate the effects of different chemical components present in hair formulations and stains on these junctional proteins and the consequent integrity of the hair shaft.

关键词： human hair Cornification Adhesion junctions Tight junctions Immunogold Ultrastructure

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FT-IR Microspectroscopic Imaging of Cross-Sectioned human hair during a Bleaching Process

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Journal of Cosmetics, Dermatological Sciences and Applications 2016年第5期6卷 181-190页

作者： Soo Ryeon Ryu Wonhyeong Jang Si-In Yu Byeong-Ha Lee Oh-Sun Kwon Kwanwoo Shin Department of Chemistry Institute of Biological Interfaces Sogang University Seoul South Korea Department of Life Science Sogang University Seoul South Korea

We investigated bleached human hair by FT-IR microspectroscopy and chemical imaging. The cross sectioned hair is approximately 90 μm in diameter, showed cuticle and cortex in chemical imaging. Differential amide I/II absorbance ratio and broadening amide I band between in the cortex and cuticle were confirmed in FT-IR microspectroscopy and chemical imaging. The cystine monoxide band from the products of disulfide oxidation of the amino acid cystine is associated with hair damaging during bleaching process. With increase bleaching time, the band for cystine monoxide shows more intense and larger area in chemical image. The spatially chemical change was investigated in detail by FT-IR microspectroscopy and chemical imaging during the bleached process.

关键词： FT-IR Imaging human hair Bleaching

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human hair-derived graphene-like carbon nanosheets to support Pt nanoparticles for direct methanol fuel cell

Human hair-derived graphene-like carbon nanosheets to suppor...

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第18届全国分子筛学术大会

作者： Gunqin Sun Lihui Zhou Jinxia Li Jing Tang Key Laboratory for Advanced Materials and Department of Chemistry East China University of Science and Technology

In this paper, a novel graphene-like carbon nanosheets(HGCN) were synthesized using human hair as a carbon source and ferric chloride(Fe Cl3) as a graphitic catalyst, which has high specific surface area(1427 m2 g-1), suitable pore size( 3 nm) and favorable graphitic structure. Moreover, the HGCN carbon framework is doped with heteroatoms of nitrogen and sulfur. For methanol fuel cell application, the hybrid catalyst of HGCN supported Pt nanoparticles(Pt/HGCN) which has a homogeneous distribution of 3.2±1.0 nm was further prepared through facile in-situ chemical co-reduction. Compared with commercial Pt/XC-72 catalysts, the Pt/HGCN hybrids possess much larger electrochemically active surface area, higher electrochemical stability, and better CO tolerance towards electrooxidation of methanol. The results indicate that HGCN is a promising alternative carbon support material for electrocatalysts in direct methanol fuel cells.

关键词： Graphene-like carbon nanosheets human hair Direct methanol fuel cells

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Identification of adrafinil and its main metabolite modafinil in human ***-administration study and interpretation of an authentic case

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Forensic Sciences Research 2020年第4期5卷 322-326页

作者： Alice Ameline Laurie Gheddar Jean-Sébastien Raul Pascal Kintz Institut de Médecine Légale Laboratoire de toxicologieStrasbourgFrance X-Pertise Consulting Département de toxicologieMittelhausbergenFrance

For several years,the misuse of stimulant substances is increasingly observed both in the field of sport,to improve the functions of the body and therefore to be more performant,and also by non-athletes to make life more tolerable on a daily ***,2-((diphenylmethyl)sulfinyl)-N-hydroxyacetamide,is a drug designed for the treatment of narcolepsy by promoting an awakened state,and to treat alertness and neurological symptoms in the *** is primarily metabolized in vivo to an active form,***,2-((diphenylmethyl)sulfinyl)*** World Anti-Doping Agency(WADA)banned these two drugs in sports in *** authors report an authentic case involving adrafinil and *** laboratory was requested to test for adrafinil in a hair strand collected from a woman found in posses-sion of vials of adrafinil and suspected of trafficking.A specific method was developed by liquid chromatography tandem mass spectrometry(LC-MS/MS).Unlike modafinil(varying from 6.8 to 13.9ng/mg),adrafinil was not identified in the *** interpretation of the results was difficult because this is the first case describing human hair *** order to be able to interpret the results,a self-administration study was conducted after an oral administration to a volunteer(200 mg)whose beard hair was collected 10days after *** analysis of this specimen highlighted the presence of adrafinil at 0.8ng/mg and modafinil at 0.5 ng/*** results demonstrate the dual identification of both compounds after a single consumption,even after administration of a low *** to these results,the analysis of the hair strand from the authentic case does not match with a con-sumption of adrafinil,in accordance with abuse of modafinil *** considered that this was a trafficking case of adrafinil,with no self-consumption.

关键词： Forensic sciences forensic toxicology adrafinil modafinil human hair UPLC-MS/MS stimulants

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Relationship between selenium concentration in child hair and the distribution of Kashin-Beck Disease in Tibet, China

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Frontiers of Medicine 2007年第2期1卷 223-225页

作者： LI Shunjiang YANG Linsheng WANG Wuyi LI Yonghua LI hairong XIRAO Ruodeng Environmental School Beijing Normal UniversityBeijing 100875China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Tibet Municipality Centers for Disease Control and Prevention Lhasa 850000China

The focus of this study is to determine the relationship between selenium(Se)concentrations in child hair and the distribution of Kashin-Beck disease(KBD)in *** hair of children in typical KBD-affected areas and non-disease areas was collected,and its Se concentrations were measured by atomic fluorescent *** Se concentrations in child hair were(0.13±0.04)and(0.18±0.07)μg/g respectively in KBD areas and non-disease areas respectively,which are significantly *** areas supplemented with Se in Tibet,the Se concentration of hair in KBD-affected areas was higher than that in non-diseased areas,being(0.28±0.03)and(0.18±0.04)μg/g *** is a close relationship between the Se concentrations in hair and KBD *** supplement increase the Se concentrations in the human *** Se supplementation is important to prevent KBD in Tibet.

关键词： Kashin-Beck disease Tibet selenium human hair

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TOTAL AND METHYL MERCURY LEVELS IN human SCALP hairS

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Nuclear Science and Techniques 1994年第2期5卷 65-70页

作者：柴之芳丰伟悦钱琴芳关铭李新继陆毅伦张秀梅

The contents of total and methyl mercury in scalp hair samples of 1179 fishermenliving at a typical Hg-polluted region in Northeast China and 27 lying-in womenand their new born babies in Beijing have been determined by illstrumental neutronactivation analysis, gas chromatography (electron coupling) and other *** 18 of all fishermen have the Hg contents above 5 ig/g, which indicates that theHg pollution there has been substantially alleviated. The longitudinal Hg patternsof the lying-in women show a gradually lowering tendency during pregnant ***, the Hg contents of the new-born babies are generally above or close to those oftheir mothers, confirming the mechanism that the methyl Hg, an organic species of Hgwith high toxicity, is readily able to penetrate the placental barrier and accumulatedin fetus. Thus, the mercury poison hajs occurred at the early stage of pregnancy.

关键词： Chemical species of mercury Total Hg Methyl Hg Neutron activation analysis Gas chromatography human hair Hg pollution

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电感耦合等离子体质谱测定人发中的微量锌

电感耦合等离子体质谱测定人发中的微量锌

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2005年全国无机质谱、同位素质谱和质谱仪器学术报告会

作者：刘雪梅刘钊杨天丽中国工程物理研究院核物理与化学研究所中国工程物理研究院核物理与化学研究所中国工程物理研究院核物理与化学研究所

Inductively coupled plasma mass spectrometry (ICP-MS) was applied to determine Zn in the human hair. The experimental results showed the liner correlation factor is higher than 0.999 .And the results

关键词： ICP-MS human hair Zn

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