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IDDoR:a novel reporter mouse system for simultaneous and quantitative in vivo analysis of both DNA double-strand break repair pathways

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Protein & Cell 2023年第5期14卷 369-375页

作者： Yu Chen Zhen Cui Zhixi Chen Ying Jiang zhiyong mao Shanghai Key Laboratory of Maternal Fetal Medicine Clinical and Translational Research Center of Shanghai First Maternity and Infant HospitalFrontier Science Center for Stem Cell ResearchSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China Tsingtao Advanced Research Institute Tongji UniversityQingdao 266071China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China

Dear Editor,Two distinct pathways,non-homologous end joining(NHEJ)and homologous recombination(HR)repair,have evolved to repair DNA double-strand breaks(DSBs),the most deleterious type of DNA damage.Impaired NHEJ and HR are often associated with a high incidence of tumorigenesis and the early onset of aging.A number of methods and tools have been developed to help elucidate the regulatory mechanisms of the two repair pathways in the past.In vitro biochemical assays employ 32P-labeled broken DNA fragments and cell extracts to evaluate DSB repair capacity.At DSB sites,several DSB repair factors form foci,which can be visualized through immunofluorescence and microscopy.Among them,phosphorylated H2AX at the Ser139 residue is often considered a DSB marker,and its formation and removal at different time points post the induction of DSBs can be used to reflect the repair capacity and genomic instability.In addition,by quantifying the kinetics of the recruitment of specific NHEJ and HR factors such as 53BP1,DNA-PKcs,MRE11,RPA2,and RAD51,one would be able to make judgments on whether NHEJ,HR,or both pathways is/are affected and sometimes at which steps DSB repair pathways are regulated.An alternative approach for kinetic analysis is to quantify the microirradiation-induced recruitment of repair factors.Moreover,comet assays are also utilized to measure DNA damage-induced genomic stability at the single-cell level.However,with these assays,it is still difficult to measure NHEJ and HR efficiency in a relatively less time-consuming and more quantitative manner.

关键词： double repair simultaneous

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Highly N-doped carbon with low graphitic-N content as anode material for enhanced initial Coulombic efficiency of lithium-ion batteries

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Carbon Energy 2023年第2期5卷 236-249页

作者： Yihua Tang Jingjing Chen zhiyong mao Christina Roth Dajian Wang Department of Electrochemical Process Engineering Universitat BayreuthBayreuthGermany Chair of Electrochemical Process Engineering Bavarian Center for Battery Technology(BayBatt)BayreuthGermany Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjinPR China

N-doped carbons as one of the most prominent anode materials to replace standard graphite exhibit outstanding Li+storage performance.However,N-doped carbon anodes still suffer from low N-doping levels and low initial Coulombic efficiency(ICE).In this study,high N-doped and low graphitic-N carbons(LGNCs)with enhanced ICE were synthesized by taking advantage of a denitrification strategy for graphitic carbon nitride(g-C_(3)N_(4)).In brief,more than 14.5 at%of N from g-C_(3)N_(4)(55.1 at%N)was retained by reacting graphitic-N with lithium,which was subsequently removed.As graphitic-N is largely responsible for the irreversible capacity,the anode's performance was significantly increased.Compared to general N-doped carbons with high graphitic-N proportion(>50%)and low N content(<15 at%),LGNCs delivered a low proportion of 10.8%-17.2% within the high N-doping content of 14.5-42.7 at%,leading to an enhanced specific capacity of 1499.9mAh g^(-1) at an ICE of 93.7% for the optimal sample of LGNC(4:1).This study provides a facile strategy to control the N content and speciation,achieving both high Li+storage capacity and high ICE,and thus promoting research and application of N-doped carbon materials.

关键词： denitrification graphitic carbon nitride graphitic-N lithium-ion batteries N-doped carbon

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Atomically bonding Na anodes with metallized ceramic electrolytes by ultrasound welding for high-energy/power solid-state sodium metal batteries

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Carbon Energy 2023年第2期5卷 184-192页

作者： Dongchen Li Xinxin Wang Qi Guo Xiaole Yu Shangxu Cen Huirong Ma Jingjing Chen Dajian Wang zhiyong mao Chenlong Dong Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjinPeople's Republic of China Key Laboratory of Display Materials and Photoelectric Devices Tianjin University of TechnologyMinistry of EducationTianjinPeople's Republic of China

A solid-state sodium metal battery has cut a striking figure in next-generation large-scale energy storage technology on account of high safety,high energy density,and low cost.Nevertheless,the large interfacial resistance and sodium dendrite growth originating from the poor interface contact seriously hinder its practical application.Herein,a modified ultrasound welding was proposed to atomically bond Na anodes and Au-metalized Na_(3)Zr_(2)Si_(2)PO_(12) electrolytes associated with the in situ formation of Na–Au alloy interlayers.Thereupon,intimate Na_(3)Zr_(2)Si_(2)PO_(12)-Au/Na interfaces with a low interfacial resistance(~23Ωcm^(2))and a strong dendrite inhibition ability were constructed.The optimized Na symmetric battery can cycle steadily for more than 900 h at 0.3 mA cm^(-2) under a low overpotential(<50 mV)of Na electroplating/stripping and deliver a high critical current density of 0.8 mAcm^(-2) at room temperature.By incorporating the above interface into the solid-state Na metal battery,taking three-dimensional Na_(3)V_(2)(PO_(4))_(3) as the cathode,the full battery offers a high energy density of 291 Wh kg^(-1) at a high power density of 1860Wkg^(-1).A pouch-type solid-state sodium metal full battery based on a ceramic electrolyte was assembled for the first time,and it lit a 3 V LED lamp.Such a strategy of the ultrasound welding metalized solid-state electrolyte/Na interface by engineering the Na-Au interlayer would pave a new pathway to engineer a low-resistance and highly stable interface for high-energy/density solid-state sodium metal batteries.

关键词： intimate interface contact metallized ceramics Na-Au interlayer solid-state sodium metal battery ultrasound welding

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Single senescent cell sequencing reveals heterogeneity in senescent cells induced by telomere erosion

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Protein & Cell 2019年第5期10卷 370-375页

作者： Huanyin Tang Anke Geng Tengjiao Zhang Chen Wang Ying Jiang zhiyong mao Clinical and Translational Research Center of Shanghai First Maternity Infant Hospital Shanghai Key Laboratory of Signaling and Disease ResearchSchool of Life Scien ces and Tech no logyTongji UniversityShanghai 200092China School of Life Sciences and Technology Tongji UniversityShanghai 200092China

Dear Editor,Over a half-century ago,Dr.Leonard Hayflick described the phenotype of a finite lifespan for human fibroblasts being passaged in in vitro cell culture(Hayflick et al.,1961),a phenomenon today known as replicative cellular senescence.Cellular senescence has been defined as a state in which cells lose their potential to divide and are permanently arrested in either the G1,or arguably the G2 stage of the cell cycle(mao et al.,2012).In addition to replicative cellular senescenee—which is induced by large amounts of DNA damage at telomeres due to loss of the specialized T-loop structure—xogenous sublethal stresses such as ionizing radiati on,genotoxic chemicals or hyper-activated on cogenes may also trigger a similar form of senescence,stress induced premature cellular senescenee(SIPS).

关键词： Single senescent cell telomere erosion

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Enhanced photocatalytic performance of SrTiO_(3) powder induced by europium dopants

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Journal of Rare Earths 2021年第5期39卷 541-547页

作者： Yingqi Wang Wenqi Ma Yuexin Song Jingjing Chen Jiao Xu Dajian Wang zhiyong mao Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Key Laboratory of Display Materials and Photoelectric Devices Ministry of EducationTianjin University of TechnologyTianjin 300384China

In this work,Eu^(3+)doped SrTiO_(3)powders were synthesized by sol-gel method and the influences of Eu^(3+)dopants on the crystalline structure,micro structure mo rphology,electronic band-gap and photocatalytic performance for degradation of o rganic pollutant were investigated in detail.Research results reveal that the incorporated Eu^(3+)ions in SrTiO_(3)lattice are preferable to substitute the Sr^(2+)-Ti^(4+)ions pair by two Eu^(3+)ions.The presence of Eu^(3+)ions plays a significant role for the microstructure morphology of the S rTiO_(3)powders,leading to the formation of smaller size nanoparticles with a higher specific surface area.The light absorption capability of the resulting materials is improved owing to the narrowing of the band-gap induced by Eu^(3+)dopants.As a result,the enhanced photocatalytic activity application for photodegradation of Rhodamine B solution is demonstrated for the SrTiO_(3)powders doped with Eu^(3+)ions.

关键词： Photocatalyst SrTiO_(3) Eu dopants Photocatalytic performance Rare earths

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CO_(2)捕集和利用技术的应用与研发进展

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油气藏评价与开发 2024年第1期14卷 70-75,101页

作者：何志勇郭本帅汪东毛松柏李忠于中国石化南京化工研究院有限公司江苏南京210048

由于CO_(2)的过度排放导致了全球严重的气候变化问题,实现碳中和已成为全球各国的共识,碳捕集、利用与封存(CCUS)是实现碳中和的必由路径之一,引起了研究者的广泛关注。中国石化南京化工研究院有限公司长期致力于CO_(2)捕集和利用技术... 详细信息

由于CO_(2)的过度排放导致了全球严重的气候变化问题,实现碳中和已成为全球各国的共识,碳捕集、利用与封存(CCUS)是实现碳中和的必由路径之一,引起了研究者的广泛关注。中国石化南京化工研究院有限公司长期致力于CO_(2)捕集和利用技术的研发和应用推广工作,已形成低分压烟气碳捕集技术、NCMA(南化复合胺)脱碳技术和催化热钾碱脱碳技术3种成熟碳捕集技术,成功应用于多个工业项目中。同时,在新型碳捕集技术和CO_(2)利用技术领域开展了大量研究,并取得了一定的进展,部分成果达到了国内及国际先进水平。

关键词：碳捕集利用脱碳烟气碳中和

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Experimental study on NO_(x)emission characteristics under oxy-fuel combustion

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Clean Energy 2023年第3期7卷 595-601页

作者： Haibo Wu zhiyong An Kai Zhang Yu mao Zhimin Zheng Zhaohui Liu Tianjin Guoneng Panshan Power Generation Co. LtdTianjin301907China China Energy Investment Corporation Beijing100011China Dongfang Boiler(Group)Co. Ltd.Zigong643001China Anhui University of Technology MaanshanAnhui243099China Huazhong University of Science and Technology WuhanHubei430074China

This study focuses on the emission characteristics of NO_(x)under oxy-fuel combustion conditions.A comparative analysis with air combustion was performed.NO_(x)emission,control measures and influence factors under different working conditions were studied.Experiments were carried out on a 3-MWth test platform and a laboratory platform.The‘π’-type furnace was adopted,with the fur-nace width of 2.6 m,depth of 2.0 m and height of 10.5 m for the 3-MWth coal-fired boiler.NO_(x)emissions at different oxygen concen-trations and different air distribution were investigated;the effects of H2O and CO_(2)concentration on denitrification efficiency and SO_(2)/SO_(3)conversion rate were explored.Experiment results suggest that,compared with air combustion,NO concentration(volume basis)at the furnace outlet under oxy-fuel combustion is higher than that of air combustion,but the amount of NO_(x)emissions in the discharged gas significantly decrease compared to the air combustion conditions.In addition,the formation of NO_(x)can be effectively controlled through staged combustion.Furthermore,the selective catalytic reduction(SCR)denitrification efficiency and the con-version rate of SO_(2)to SO_(3)decreases when the CO_(2)concentration and the H2O content increase,indicating that CO_(2)and H2O have an adverse effect on the performance of the catalyst.Additionally,compared with CO_(2)concentration,H2O content has a greater effect on catalyst performance.

关键词： experimental research NO_(x) oxy-fuel combustion SO_(2)/SO_(3)

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抗(感)赤霉病谷子品种内生菌多样性分析

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华北农学报 2024年第1期39卷 175-183页

作者：毛亚楠田菲菲刘婷婷韩欣芃郝志敏李志勇河北省农林科学院谷子研究所农业农村部特色杂粮遗传改良与利用重点实验室(部省共建)河北省杂粮研究重点实验室河北石家庄053000 河北省农业微生物生物信息技术创新中心河北农业大学生命科学学院河北保定071001 石家庄市园林绿化管护中心河北石家庄050066

旨为揭示不同品种以及不同器官中内生菌的多样性特征,初步明确内生菌群落结构与宿主品种、器官类型及病害抗感特性的相关性。选取抗赤霉病的冀谷22、红谷、陇谷11号和感赤霉病的小青谷、石榴子、嫩选16号共6个谷子品种,取其根、茎、叶... 详细信息

旨为揭示不同品种以及不同器官中内生菌的多样性特征,初步明确内生菌群落结构与宿主品种、器官类型及病害抗感特性的相关性。选取抗赤霉病的冀谷22、红谷、陇谷11号和感赤霉病的小青谷、石榴子、嫩选16号共6个谷子品种,取其根、茎、叶片、叶鞘、成熟谷穗,提取DNA,针对16S rDNA V3—V4区域,进行PCR扩增,基于Miseq高通量测序平台,对样本进行微生物多样性分析。感病品种与抗病品种内生菌物种组成具有明显差异。供试样本在门水平上的优势种群为变形菌门和放线菌门,其次是拟杆菌门和厚壁菌门,粘菌门、绿弯菌门、芽单胞菌门和梭杆菌门相对丰度较低。Alpha多样性分析表明,抗病品种的叶片、成熟谷穗群落丰富度较高,叶片、根、成熟谷穗多样性较高;而感病品种则是根和茎群落丰富度较高,茎和叶鞘多样性相对较高;PCoA分析则表明,器官类型比品种对内生菌群落结构影响更大。物种组成分析表明,谷子内生菌群的多样性受到不同品种及不同器官的影响,不同器官所含内生菌种类相差较大。感病品种小青谷、石榴子和嫩选16与抗病品种冀谷22、红谷和陇谷11的内生菌群多样性差异较大,抗病品种在叶鞘时期都具有NB1-j菌门,成熟谷穗都具有酸杆菌门。明确了不同品种、不同器官对谷子内生菌的多样性及群落结构的影响,器官类型比品种对内生菌群落结构的影响更大。

关键词：谷子谷子赤霉病内生菌多样性

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灯盏花乙素-磷脂复合物纳米乳的体内外评价及其改善脂多糖诱导血管内皮损伤的活性分析

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中国实验方剂学杂志 2024年第10期30卷 159-168页

作者：罗田贺智勇茅向军刘学贺井刚支苑沈祥春许乾丽陶玲贵州医科大学贵州省天然药物资源高效利用工程中心贵州省普通高等学校天然产物药理与成药性评价特色重点实验室贵州医科大学-贵阳市联合重点实验室天然药物资源优效利用重点实验室药学院贵阳550025 云岩区人民医院贵阳550003 贵州省药品监督管理局检查中心贵阳550081 贵州省食品药品检验所贵阳550004

目的:评价灯盏花乙素-磷脂复合物纳米乳(SCU-PC-NE)的释放、细胞摄取与组织分布等行为,并探究其改善脂多糖(LPS)诱导血管内皮损伤的作用。方法:分别称取SCU-PC、油酸乙酯、15-羟基硬脂酸聚乙二醇酯、1,2-丙二醇(50、400、514.3、85.7 m... 详细信息

目的:评价灯盏花乙素-磷脂复合物纳米乳(SCU-PC-NE)的释放、细胞摄取与组织分布等行为,并探究其改善脂多糖(LPS)诱导血管内皮损伤的作用。方法:分别称取SCU-PC、油酸乙酯、15-羟基硬脂酸聚乙二醇酯、1,2-丙二醇(50、400、514.3、85.7 mg),制备SCU-PC-NE,并利用透射电镜观察其形态,纳米电位粒度分析仪测定粒径和Zeta电位。采用动态透析法考察SCU-PC-NE体外累积释放度;采用噻唑蓝(MTT)比色法考察SCU-PC-NE对人脐静脉内皮细胞(HUVECs)活力的影响;以香豆素6为荧光探针,采用荧光倒置显微镜和流式细胞仪考察SCU-PC-NE的体外HUVECs摄取情况;小动物活体成像仪考察近红外荧光染料DiR标记的纳米乳DiR/SCU-PC-NE的组织分布;采用LPS(1 mg·L^(-1))共孵育制备HUVECs炎症损伤模型,酶联免疫吸附测定法(ELISA)检测SCU-PC-NE对其中白细胞介素(IL)-1β及IL-6水平的影响;取18只昆明种雄性小鼠,随机分为空白组、模型组、空白制剂组(等同于高剂量组)、SCU组和SCU-PC-NE低、高剂量组(5、10 mg·kg^(-1)),每组3只,每隔48 h给药组按相应剂量尾静脉给药1次,空白组和模型组给予等体积生理盐水,连续给药4次。除空白组外,各组末次给药前12 h腹腔注射LPS(10 mg·kg^(-1))诱导小鼠血管内皮炎症损伤,采用苏木素-伊红(HE)染色考察SCU-PC-NE对小鼠胸主动脉组织病理变化的影响。结果:形态观察显示,SCU-PC-NE呈淡黄色乳光,大多呈球形,外观圆整,粒径分布较均匀,平均粒径35.31 nm,Zeta电位7.23 mV,包封率75.24%;体外累积释放度考察表明SCU-PC-NE较SCU表现出一定的缓释性能;SCU-PC-NE在质量浓度为1.05~8.4 mg·L^(-1)时细胞存活率均>90%;细胞摄取实验结果表明,与SCU组比较,SCU-PC-NE的细胞摄取能力显著增强(P<0.01);组织分布考察结果表明,与正常小鼠比较,腹腔注射LPS后,不同时间点DiR/SCU-PC-NE在小鼠脾脏、肾脏、大脑和胸主动脉荧光强度明显增强(P<0.05,P<0.01),以胸主动脉最为明显;ELISA结果表明,与空白组比较,模型组的IL-1β和IL-6因子水平明显增加(P<0.05,P<0.01),与模型组比较,各给药组均可显著下调IL-1β水平,以SCU-PC-NE高剂量组效果最强(P<0.01),各给药组均可明显下调IL-6水平,以SCU-PC-NE低剂量组效果最强(P<0.05);组织病理考察结果表明,与空白组比较,模型组表现出内皮细胞受损、弹性纤维断裂和排列松散,空白制剂组、SCU组和SCU-PC-NE低剂量组虽也有类似的血管损伤,但SCU-PC-NE高剂量组血管内皮损伤明显缓解,效果优于SCU组。结论:SCU-PC-NE可促进内皮细胞对药物的摄取,并有效富集在LPS所致的血管内皮损伤部位,其对血管内皮损伤有一定的保护作用,是SCU的良好载体。

关键词：灯盏花乙素磷脂复合物纳米乳脂多糖(LPS) 炎症血管内皮人脐静脉内皮细胞

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检测PRRSV及鉴别HP-PRRSV毒株的二重PCR与二重TaqMan荧光定量PCR方法

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中国兽医科学 2024年第3期54卷 316-324页

作者：陈旭汤德元曾智勇王彬袁盛林廖正波何松周飘毛茵茗贵州大学动物科学学院贵州贵阳550025

为了实现猪繁殖与呼吸综合征病毒(PRRSV)早期检测及快速鉴别高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)变异株,利用HP-PRRSV Nsp2蛋白第481位和532~560位氨基酸缺失的特性设计2对引物,优化反应条件建立二重PCR检测方法,同时针对PRRSV M... 详细信息

为了实现猪繁殖与呼吸综合征病毒(PRRSV)早期检测及快速鉴别高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)变异株,利用HP-PRRSV Nsp2蛋白第481位和532~560位氨基酸缺失的特性设计2对引物,优化反应条件建立二重PCR检测方法,同时针对PRRSV M基因和HP-PRRSV Nsp2基因设计特异性引物和探针,优化反应条件建立二重TaqMan荧光定量PCR方法,并评估这2种方法的敏感性、特异性、重复性。敏感性试验结果显示:二重PCR方法的检测下限分别为0.058 ng/μL(PRRSV)和4.7 ng/μL(HP-PRRSV);二重TaqMan荧光PCR方法的检测下限分别为10 copies/μL(PRRSV)和100 copies/μL(HP-PRRSV)。这2种方法与其他猪病病原均不发生非特异性反应,重复性试验结果良好。经131份临床样品检测,可得到PRRSV的阳性率约12.2%(16/131)、HP-PRRSV的阳性率约17.6%(23/131)、二者的混合感染率约8.4%(11/131)。证实,本研究成功建立了二重PCR和二重TaqMan荧光定量PCR检测方法,可为临床上猪繁殖与呼吸综合征的防控提供技术支持。

关键词：猪繁殖与呼吸综合征病毒高致病性猪繁殖与呼吸综合征病毒二重PCR 二重TaqMan荧光定量PCR 鉴别检测

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