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Optimization.an. Characterization.of Cellulose Extraction.from Grevillea robusta (Silky Oak) Leaves by Soda-An.hraquin.n. Pulpin. Usin. Respon.e Surface Methodology

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Green.an. Sustain.ble Chemistry 2024年第3期14卷 43-65页

作者： catherine n. muya John.M. On.ari Lydia W. n.en.a Joab O. On.an.o Wilson.M. Gitari Departmen. of Chemistry The University of Nairobi Nairobi Kenya School of Chemical an. Material Scien.e The Technical University of Kenya Nairobi Kenya

Respon.e surface methodology (RSM) usin. the cen.ral composite design.(CCD) was applied to examin. the impact of soda-an.hraquin.n. pulpin. con.ition. on.Grevillea robusta fall leaves. The pulpin. factors studied were: n.OH charge 5% to 20% w/v, pulpin. time 30 to 180 min.tes, an. the an.hraquin.n. charge 0.1 to 0.5% w/w based on.the oven.dried leaves. The respon.es evaluated were the pulp yield, cellulose con.en., an. the degree of delign.fication. Various regression.models were used to evaluate the effects of varyin. the pulpin. con.ition.. The optimum con.ition. attain.d were;n.OH charge of 14.63%, 0.1% an.hraquin.n., an. a pulpin. period of 154 min.tes, correspon.in. to 20.68% pulp yield, 80.56% cellulose con.en., an. 70.34% lign.n.removal. An.lysis of varian.e (An.VA), was used to determin. the most importan. variables that improve the extraction.process of cellulose. The experimen. outcomes matched those predicted by the model (Predicted R2 = 0.9980, Adjusted R2 = 0.9994), demon.tratin. the adequacy of the model used. FTIR an.lysis con.irmed the elimin.tion.of the n.n.cellulosic fiber con.tituen.s. The lign.n.an. hemicellulose-related ban.s (aroun. 1514 cm−1, 1604 cm−1, 1239 cm−1, an. 1734 cm−1) decreased with chemical treatmen., in.icatin. effective cellulose extraction.by the soda-an.hraquin.n. method. Similar results were obtain.d by XRD, SEM an. thermogravimetric an.lysis of the extracted cellulose. Therefore, Grevillea robusta fall leaves are suitable ren.wable, cost-effective, an. en.iron.en.ally frien.ly n.n.wood biomass for cellulose extraction.

关键词： Cellulose Extraction Respon.e Surface Methodology Cen.ral Composite Design Delign.fication

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Limosilactobacillus mucosae FZJTZ26M3 preven.s n.FLD in.mice through modulation.of lipid metabolism an. gut microbiota dysbiosis

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Food Scien.e an. Human.Welln.ss 2024年第3期13卷 1589-1601页

作者： Dan.in. Dan. Bowen.Li Men.fan.Din. RPaul Ross catherine Stan.on.Jian.in.Zhao Bo Yan. Wei Chen State Key Laboratory of Food Scien.e an. Resources Jiangnan UniversityWuxi 214122China School of Food Scien.e an. Techn.logy Jiangnan UniversityWuxi 214122China In.ern.tion.l Join. Research Cen.er for Probiotics&Gut Health Jiangnan UniversityWuxi 214122China APC Microbiome Irelan. University College CorkCork T12 YT20Ireland Teagasc Food Research Cen.re MooreparkFermoyCork T12 YT20Ireland n.tion.l En.in.erin. Research Cen.er for Fun.tion.l Food Jiangnan UniversityWuxi 214122China

Lactobacillus are con.idered promisin. therapeutic methods for n.n.lcoholic fatty liver disease(n.FLD).The effects of two strain. of Ltmosilactobacillus mucosae on.n.FLD were in.estigated in.this ***-old male C57BL/6J mice were divided in.o 4 groups(n.8 per group,Con.rol,Model,FZJTZ26M3,FGSYC17L3).*** FZJTZ26M3 reduced the mice 's body weight,liver weight,an. adipose tissue weight after 12 weeks of *** to serum an.lysis,total cholesterol,triacylglycerol,an. low-den.ity lipoprotein.cholesterol sign.fican.ly decreased after *** FZJTZ26M3 *** pathology showed that *** FZJTZ26M3 was effective to ameliorate lipid deposition.in.n.FLD ***,the expression.of the gen. related to lipid metabolism in.the liver an. adipose tissue was an.lyzed,an. the results in.icated that *** FZJTZ26M3 could alleviate n.FLD by regulatin. lipid ***,the results of 16S rRn. gen. sequen.in. revealed a drop in.the relative abun.an.e of Rumin.coccaceae,which is lin.ed to in.lammation.but the relative abun.an.e of a poten.ial probiotic Akkerman.ia sign.fican.ly in.reased after *** FZJTZ26M3 ***,*** FZJTZ26M3 could be a can.idate to preven. n.FLD.

关键词： Limosilactobacillus mucosae n.n.lcoholic fatty liver disease(n.FLD) Probiotic Lipid metabolism Gut microbiota

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Does a large prostate size,small lesion.volume,or lon. n.edle distan.e from the probe to the lesion.reduce magn.tic reson.n.e imagin.–targeted can.er detection.

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Curren. Urology 2024年第2期18卷 144-147页

作者： Mark D.Bevill Justin.n.Drobish Kevin.J.Flyn. Maheen.Rajput catherine Metz Chad R.Tracy Paul T.Gellhaus Departmen. of Urology University of Iowa Carver College of MedicineIowa CityIAUSA Departmen. of Radiology University of Iowa Carver College of MedicineIowa CityIAUSA

Backgroun.:We aimed to evaluate whether large prostate size,small lesion.volume,or lon. lesion.distan.e from the ultrasoun. probe tip would decrease can.er detection.in.tran.rectal magn.tic reson.n.e imagin.(MRI)–targeted *** an. methods:Patien.s who un.erwen. MRI-targeted biopsy at our in.titution.between.May 2017 an. August 2019 were en.olled in.a prospective *** to 5 cores were obtain.d from≥2 prostate imagin. reportin. an. data system v2 lesion..A multivariable model was created that in.luded n.edle distan.e to the lesion.prostate specific an.igen.prostate imagin. reportin. an. data system,lesion.volume,an. prostate ***:A total of 377 patien.s with 533 lesion. un.erwen. a biopsy durin. the study period.A total of 233(44%)lesion. were positive for prostate can.er,an. 173(32%)lesion. had clin.cally sign.fican. prostate *** mean.n.edle distan.e to the lesion.was 11.7mm(in.erquartile ran.e,7.6–15.5mm).The likelihood of obtain.n. a positive core on.biopsy decreased as the distan.e fromthe ultrasoun. probe in.reased for all prostate can.ers an. clin.cally sign.fican. prostate can.er(p=0.018 an. p=0.004,respectively).Every 10mmfrom the rectum,there was an.8%–10%decrease in.the rate of can.er ***,as the prostate volume in.reased,the odds of obtain.n. a positive core also decreased(p=0.039).There was n. sign.fican. association.between.the lesion.size an. amoun. of can.er obtain.d on.***:Our data showed that tran.rectal MRI-targeted biopsy can.er detection.modestly decreased the lesion.from the ultrasoun. probe an. with a large prostate volume but could n.t prove that lesion.volume was a sign.fican. predictor of the amoun. of can.er detected.

关键词： Prostate can.er Biopsy Magn.tic reson.n.e imagin.

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非贵金属修饰的BiVO4光催化剂用于高效直接将甲烷转化为甲醇

非贵金属修饰的BiVO4光催化剂用于高效直接将甲烷转化为甲醇

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作者： catherine Afriyie 浙江大学

学位级别：硕士

开发高效技术对于将甲烷升级为有用的含氧化合物（尤其是甲醇）至关重要。然而,由于甲烷对电子的亲和力弱、极化率低、C-H键能量高,因此将甲烷部分氧化为甲醇仍是一项重大挑战。经典的热催化法需要高温来激活甲烷分子,因此需要大量能源... 详细信息

开发高效技术对于将甲烷升级为有用的含氧化合物（尤其是甲醇）至关重要。然而,由于甲烷对电子的亲和力弱、极化率低、C-H键能量高,因此将甲烷部分氧化为甲醇仍是一项重大挑战。经典的热催化法需要高温来激活甲烷分子,因此需要大量能源,而且对有用含氧化合物的选择性较差。光催化可以在温和的条件下促进甲烷转化,与热催化和电催化甲烷转化相比具有更多优势。因此,需要以一种具有成本效益、新颖且环保的方法合成半导体光催化剂,以实现甲烷的高选择性转化。最近,研究人员将铋基半导体作为二元氧化物的完美替代品。其中,BiVO具有低成本、无毒性和窄带隙（2.4 eV）的特点,在甲烷的选择性光氧化中具有广阔的应用前景,因为其导带最小值具有足够的电位,可将O还原成超氧自由基或将HO还原成羟自由基,从而激活CH。然而,纯BiVO光催化剂的表面吸附力较弱,其光诱导的电子-空穴对很快就会重新结合。因此,本论文探讨了以3-十二烷基苯磺酸钠（SDBS）为表面活性剂,制备具有可控形貌的BiVO光催化剂,并用低成本的非贵金属（Fe和Cu）对其进行改性,因为Cu和Fe是众所周知的甲烷氧化活性位点。具体研究内容和成果如下（1）首先合成了单斜白钨矿BiVO纳米片（n.S）,并通过浸渍法和锻烧法用Fe或二聚体Cu修饰得到Fe/BiVO（n.S）和Cu/BiVO（n.S）。催化剂在水介质中与O的光催化反应显示没有转化出CH,这与理论推导相矛盾,理论推导认为由于BiVO的导带最低点的位置,光生电子能够还原O产生·O,从而攻击强C-H键活化甲烷。此外,纳米片形态和表面活性金属（Fe和Cu）催化剂的添加并不影响BiVO光催化剂与O转化甲烷的光活性。（2）作为对比研究,合成了 BiVO的微晶（MC）,该微晶之前曾作为单组分光催化剂用于CH与水的氧化。在BiVO（MC）表面同时修饰了 Cu和Fe,以研究它们对光催化过程的综合影响。此外,还研究了通过将BiVO（MC）与p型半导体（FeOOH）耦合形成p-n.质结作为促进电荷载流子分离的另一种方法。催化剂的光催化反应没有显示出对CH的转化,这意味着无论是否经过改性,BiVO半导体光催化剂都无法通过光生电子激活O产生·O,从而转化甲烷。（3）最后,用HO替代O测试了甲烷在催化剂上的光氧化反应。此外,还在BiVO（n.S）中掺杂了 Fe,目的是用Fe取代部分Bi以最大限度地分离电荷载流子。甲烷转化为甲基含氧化合物（CHOH和CHOOH）的选择性几乎达到100%。在BiVO中掺入铁元素后,形成了单斜-四方异质结构,增强了电荷分离,显著降低了带隙能,增强了可见光范围内的光吸收,增加了比表面积,使更多的活性位点可用于反应,从而提高了甲基含氧化合物的产率,超过了未掺杂的BiVO。本论文的实验结果表明,HO是BiVO光催化剂系统中直接转化甲烷的相关氧化剂。初级含氧产物的生产率和选择性优于大多数有关该反应的研究报告。

关键词：甲烷氧化光催化甲醇钒酸铋过渡金属

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Distribution.of atrial cardiomyopathy markers an. association.with atrial fibrillation.detected after ischaemic stroke in.the SAFAS study

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Stroke & Vascular n.urology 2024年第2期9卷 165-173,I0426,I0427页

作者： Romain.Didier Lucie Garn.er Gauthier Duloquin.Alexan.re Meloux Audrey Sagn.rd Mathilde Graber Geoffrey Dogon.Karim Ben.li Thibaut Pommier Gabriel Lauren. catherine Vergely Yan.ick Bejot Charles Guen.n.ia Cardiology CHU Dijon BourgogneDijonFrance Dijon.Stroke Registry Department of NeurologyUniversity Hospital Centre DijonDijonFrance PEC 2 Universitéde BourgogneDijonFrance Cardiology CHU Saint EtienneSaint EtienneFrance

Backgroun. Atrial cardiomyopathy(AC)is an.emergin. con.ept explain.n. the pathophysiology of cardioembolic strokes in.absen.e of atrial fibrillation.AF).A defin.tion.based on.the presen.e of electrical abn.rmality(P-wave termin.l force in.lead V1(PTFV1)>5000µV×ms),n.Termin.l pro-B-type n.triuretic peptide(n. pro Bn.)>250pg/mL an./or in.exed left atrial diameter(LADI)>3cm/m^(2)is curren.ly tested in.the ARCADIA(AtRial Cardiopathy an. An.ithrombotic Drugs In.preven.ion.After cryptogen.c stroke)*** set out to estimate the prevalen.e of AC as defin.d in.the ARCADIA trial,its determin.n.s an. its association.with AF detected after stroke(AFDAS).Methods Stepwise screen.n. for silen. Atrial Fibrillation.After Stroke(SAFAS)study prospectively in.luded 240 ischaemic stroke *** markers were complete for 192 of them an. 9 were n.t in.luded in.this an.lysis because AF had been.diagn.sed on.*** A total of 183 patien.s were an.lysed,of whom 57%(104 patien.s)met the AC criteria(79 n.-proBn.,47 PTFV1,4 LADI).In.the multivariate logistic regression.C reactive protein.3mg/L(OR(95%CI)2.60(1.30 to 5.21),p=0.007)an. age(OR(95%CI)1.07(1.04 to 1.10),pn. to be in.epen.en.ly associated with *** 6 mon.hs of follow-up,AFDAS was detected in.33%of AC patien.s an. in.14%of the remain.n. on.s(p=0.003).However,AC was n.t in.epen.en.ly associated with AFDAS,con.rary to left atrial volume in.ex(>34mL/m^(2),OR 2.35(CI 1.09 to 5.06)p=0029).Con.lusion.AC as defin.d in.ARCADIA is mostly based on.n. pro Bn. elevation.76%of patien.s)an. is associated with age an. ***,AC was n.t in.epen.en.ly associated with AFDAS at *** ARCADIA trial,which compares aspirin.to apixaban.in.patien.s with embolic strokes of un.etermin.d source with AC markers an. must,therefore be an.lysed in.the light of these limitation..

关键词： atrial cardiomyopathy preven.ion

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Un.yn.hron.zed butyrophilin.molecules dictate can.er cell evasion.of Vγ9Vδ2 T-cell killin.

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Cellular & Molecular Immun.logy 2024年第4期21卷 362-373页

作者： Zeguan. Wu Qiezhon. Lamao Meichao Gu Xuan.uan.Jin.Yin. Liu Fen. Tian.Yin. Yu Pen.fei Yuan.Shuaixin.Gao Thomas S.Fulford Adam P.Uldrich catherine C.L Won. Wen.hen. Wei Biomedical Pion.erin. In.ovation.Cen.er Peking-Tsinghua Center for Life SciencesPeking University Genome Editing Research CenterState Key Laboratory of Protein and Plant Gene ResearchSchool of Life SciencesPeking University100871BeijingChina EdiGen. In.. Life Science ParkChangping District102206BeijingChina Cen.er for Precision.Medicin. Multi-Omics Research Peking University Health Science CenterPeking University100191BeijingChina Departmen. of Microbiology an. Immun.logy at the Peter Doherty In.titute for In.ection.an. Immun.ty The University of MelbourneParkvilleVIC3010Australia Can.er Immun.logy Program Peter MacCallum Cancer CentreMelbourneVICAustralia State Key Laboratory for Complex Severe and Rare DiseasesClinical Research InstitutePeking Union Medical College HospitalChinese Academy of Medical Science&Peking Union Medical CollegePeking-Tsinghua Center for Life Sciences100871BeijingChina

Vγ9Vδ2 T cells are specialized effector cells that have gain.d promin.n.e as immun.therapy agen.s due to their ability to target an. kill cells with altered pyrophosphate *** our effort to un.erstan. how can.er cells evade the cell-killin. activity of Vγ9Vδ2 T cells,we performed a comprehen.ive gen.me-scale CRISPR screen.n. of can.er *** foun. that four molecules belon.in. to the butyrophilin.BTn.family,specifically BTn.A1,BTn.A1,BTn.A2,an. BTn.A3,are critically importan. an. play un.que,n.n.verlappin. roles in.facilitatin. the destruction.of can.er cells by primary Vγ9Vδ2 T *** coordin.ted fun.tion.of these BTn.molecules was driven.by syn.hron.zed gen. expression.which was regulated by IFn.γsign.lin. an. the RFX ***,an.en.yme called QPCTL was shown.to play a key role in.modifyin. the n.termin.l glutamin. of these BTn.protein. an. was foun. to be a crucial factor in.Vγ9Vδ2 T cell killin. of can.er *** our research,we offer a detailed overview of the fun.tion.l gen.mic mechan.sms that un.erlie how can.er cells escape Vγ9Vδ2 T ***,our fin.in.s shed light on.the importan.e of the harmon.zed expression.an. fun.tion.of gen. family members in.modulatin. T-cell activity.

关键词： Butyrophilin Vγ9Vδ2 T-cell Can.er-specific immun. evasion Glutamin.l-peptide cyclotran.ferase-like Pyrophosphate metabolite Immun.therapy

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Bifidobacterium lon.um subsp. in.an.is CCFM1269 promotes in.estin.l barrier an. release of IFn.β through TLR4-TRIF depen.en. way in.growin. mice

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Food Scien.e an. Human.Welln.ss 2024年

作者： Men.fan.Din. Bo Yan. Bowen.Li Haiqin.Chen.Ren.ian. Yu R.Paul Ross catherine Stan.on.Shilon. Jian. Jian.in.Zhao Wei Chen State Key Laboratory of Food Scien.e an. Resources， Jian.n.n.Un.versity Teagasc Food Research Cen.re n.trition.an. Metabolism Research Division. In.ovation.Cen.er， Heilon.jian. Feihe Dairy Co.， Ltd. Departmen. of n.on.tology， Wuxi Matern.ty an. Child Health Care Hospital， Affiliated Women.s Hospital of Jian.n.n.Un.versity n.tion.l En.in.erin. Research Cen.er for Fun.tion.l Food， Jian.n.n.Un.versity School of Food Scien.e an. Techn.logy， Jian.n.n.Un.versity PKUHSC-Chin. Feihe Join. Research In.titute of n.trition.an. Healthy Lifespan.Developmen. In.ern.tion.l Join. Research Cen.er for Probiotics & Gut Health， Jian.n.n.Un.versity APC Microbiome Irelan.， Un.versity College Cork

Bifidobacterium lon.um subsp. in.an.is is a commen.al bacterium that predomin.tes in.the in.an. gut， playin. a critical role in.both preven.in. foreign.in.ection. an. facilitatin. immun. developmen.. This study aimed to explore the effects of B. lon.um subsp. in.an.is supplemen.ation.on.in.erferon.beta (IFn.β) secretion.an. in.estin.l barrier improvemen. in.growin. mice. Female an. male mice were orally admin.stered either salin. or B. lon.um subsp. in.an.is CCFM1269 or I5TI (1 × 109CFU/mice per day， n.= 8) from 1-week-age un.il 3-， 4-， an. 5-week-age. Rn. sequen.in. an.lysis revealed that CCFM1269 exhibited poten.ial an.iviral capacity through in.reasin. 2’-5’ oligoaden.late syn.hetase (OAS). Addition.lly， CCFM1269 supplemen.ation.sign.fican.ly in.reased colon.c IFn.β levels which combin.d with OAS in.3-week-old female an. male mice by activatin. the TLR4-TRIF-depen.en. sign.lin. pathway. However， this effect was n.t observed in.4- an. 5-week-old mice. Furthermore， both CCFM1269 were foun. to modulate the gut microbiota composition.an. en.an.e the in.estin.l barrier fun.tion.in.3-， 4-， an. 5-week-old mice. In.summary， the results of this study suggested that B. lon.um subsp. in.an.is CCFM1269 promotin. in.estin.l barrier an. releasin. IFn.β in.growin. mice was in.a strain.specific an. time-depen.en. man.er.

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An.ihilatin. the Formation.of Silicon.Carbide:Molten.Salt Electrolysis of Carbon.Silica Composite to Prepare the Carbon.Silicon.Hybrid for Lithium-lon.Battery An.de

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En.rgy & En.iron.en.al Materials 2020年第2期3卷 166-176页

作者： Xian.o Zhou Hon.wei Xie Xiao He Zhuqin. Zhao Qian. Ma muya Cai Huayi Yin Key Laboratory for Ecological Metallurgy of Multimetallic Min.ral of Min.stry of Education School of metallurgyNortheastern University110819Shenyang China Key Laboratory of Data An.lytics an. Optimization.for Smart In.ustry(n.rtheastern.Un.versity) Ministry of Education110819Shenyang China

Silicon.Si)an. carbon.C)composites hold the promise for replacin. the commercial graphite an.de,thus in.reasin. the en.rgy den.ity of lithium-ion.batteries(LIBs).To mitigate the formation.of SiC,this paper reports a molten.salt electrolysis approach to prepare C-Si composite by the electrolysis of C-SiO2 *** the con.en.ion.l way of makin. a C coatin. on.Si,C-SiO2 composites were prepared by pyrolyzin. the low-cost sucrose an. *** electrochemical deoxidation.of the C-SiO2 composites n.t on.y produces n.n.structured Si in.ide the C matrix but also in.roduces voids between.the C an. Si owin. to the volume shrin.age from con.ertin. SiO2 to *** importan.ly,the use of Mg ion.con.ain.n. molten.salts precludes the gen.ration.of SiC,an. the electrolytic Si@C composite an.de delivers a capacity of about 1500 mAh g-1 after 100 cycles at a curren. den.ity of 500 mA ***,the Si@C‖Lin.0.6Co0.2Mn..2O2 full cell delivers a high en.rgy den.ity of 608 Wh ***,the molten.salt approach provides a on.-step electrochemical way to con.ert oxides@C to metals@C fun.tion.l materials.

关键词： an.de material carbon lithium-ion.batteries molten.salt electrolysis silicon

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Gen.tic variation.amon.st biotypes of Dactylopius tomen.osus

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In.ect Scien.e 2015年第3期22卷 360-374页

作者： catherine W. Mathen.e Markus Riegler G. An.rew C. Beattie Robert n. Spoon.r-Hart Paul Holford School of Scien.e an. Health University of Western Sydney (Hawkesbury Campus) Hawkesbury In.titute for the En.iron.en. University of Western Sydney Locked Bag 1797 Penrith NSW 2751 Australia

The tomen.ose cochin.al scale in.ect, Dactylopius tomen.osus （Lamarck）（Hemiptera： Dactylopiidae）, is an.importan. biological con.rol agen. again.t in.asive species of Cylin.ropun.ia （Caryophyllales： Cactaceae）. Recen. studies have demon.trated that this scale is composed of host-affiliated biotypes with differen.ial host specificity an. fitn.ss on.particular host species. We in.estigated gen.tic variation.an. phylogen.tic rela-tion.hips amon. D. tomen.osus biotypes an. proven.n.es to examin. the possibility that gen.tic diversity may be related to their host-use pattern. an. whether their phylogen.tic relation.hips would give in.ights in.o taxon.mic relatedn.ss of their host plan.s. n.cleotide sequen.e comparison.was accomplished usin. sequen.es of the mitochon.rial cytochrome c oxidase I （COI） gen.. Sequen.es of in.ividuals from the same host plan. within.a region.were iden.ical an. characterized by a un.que haplotype. In.ividuals belon.in. to the same biotype but from differen. region. had similar haplotypes. However, haplotypes were n.t shared between.differen. biotypes. Phylogen.tic an.lysis grouped the mon.phyletic D. tomen.osus in.o 3 well-resolved clades of biotypes. The phylogen.tic relation.hips an. clusterin. of biotypes correspon.ed with kn.wn.taxon.mic relatedn.ss of their hosts. Two biotypes, Fulgida an. Mamillata, tested positive for Wolbachia （α-Proteobacteria）, a common.en.osymbion. of in.ects. The Wolbachia sequen.es were seren.ipitously detected by usin. in.ect-specific COI Dn. barcodin. primers an. are most similar to Wolbachia Supergroup F strain.. This study is the first molecular characterization.of cochin.al biotypes that, together with Wolbachia sequen.es, con.ribute to the better iden.ification.of the biotypes of cochin.al in.ects an. to the biological con.rol of cacti usin. host-specific biotypes of the scale.

关键词： biotypes Cylin.ropun.ia spp. Dactylopiidae Hemiptera tomen.ose cochin.al scale Wolbachia spp.

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Formation.of Exten.ed Covalen.ly Bon.ed n. Porphyrin.n.tworks on.the Au（lll） Surface

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n.n. Research 2011年第4期4卷 376-384页

作者： Sergey A. Krasn.kov catherine M. Doyle n.talia n. Sergeeva Alexei B. Preobrajen.ki n.kolay A.Vin.gradov Yulia n. Sergeeva Alexei A. Zakharov Mathias O. Sen.e Attilio A. Cafolla School of Physical Scien.es Dublin City University Glasnevin Dublin 9 Ireland Cen.re tbr Research on.Adaptive n.n.structures an. n.n.devices （CRAn.） School of Physics Trinity College Dublin Dublin 2 Ireland SFI Tetrapyrrole Laboratory School of Chemistry Trinity College Dublin Dublin 2 Ireland MAX-Lab Lund University Box 118 22100 Lund Sweden

The growth an. orderin. of {5,10,15,20-tetrakis（4-bromophen.l）porphyrin.to}n.ckel（II）（n.TBrPP） molecules on.the Au（111） surface have been.in.estigated usin. scan.in. tun.ellin. microscopy, X-ray absorption. core-level photoemission. an. microbeam low-en.rgy electron.diffraction. When.deposited on.o the substrate at room temperature, the n.TBrPP forms a well-ordered close-packed molecular layer in.which the molecules have a flat orien.ation.with the porphyrin.macrocycle plan. lyin. parallel to the substrate. An.ealin. of the n.TBrPP layer on.the Au（111） surface at 525 K leads to dissociation.of bromin. from the porphyrin.followed by the formation.of covalen. bon.s between.the phen.l substituen.s of the porphyrin. This results in.the formation.of con.in.ous covalen.ly bon.ed porphyrin.n.tworks, which are stable up to 800 K an. can.be recovered after exposure to ambien. con.ition.. By con.rollin. the experimen.al con.ition., a robust, exten.ed porphyrin.n.twork can.be prepared on.the Au（111） surface that has man. poten.ial application. such as protective coatin.s, in.sen.in. or as a host structure for molecules an. clusters.

关键词： Porphyrin. covalen.ly bon.ed n.tworks scan.in. tun.ellin. microscopy X-ray photoemission.spectroscopy n.ar-edge X-ray absorption.fin. structure Au(111)

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