期刊文献+
共找到188,218篇文章
< 1 2 250 >
每页显示 20 50 100
基于Penton蛋白禽腺病毒血清4型间接ELISA抗体检测方法的建立
1
作者 李鹏 雷梦瑶 +9 位作者 冯丽丽 王振伟 管春晓 郑洪双 王俊茹 王利平 李炎锦 吴欣媛 刘兴友 金前跃 《河南农业科学》 北大核心 2024年第7期133-141,共9页
Penton蛋白是构成禽腺病毒血清4型(Fowl adenovirus serotype 4,FAdV-4)衣壳的主要结构蛋白,具备高度保守性与良好的免疫原性。以纯化的Penton蛋白为包被抗原,建立一种基于禽腺病毒血清4型Penton蛋白的间接ELISA抗体检测方法。结果显示,... Penton蛋白是构成禽腺病毒血清4型(Fowl adenovirus serotype 4,FAdV-4)衣壳的主要结构蛋白,具备高度保守性与良好的免疫原性。以纯化的Penton蛋白为包被抗原,建立一种基于禽腺病毒血清4型Penton蛋白的间接ELISA抗体检测方法。结果显示,Penton蛋白最佳包被质量浓度为2μg/mL,血清稀释倍数为200倍,酶标抗体稀释倍数为1∶5000,阳性临界值为0.222,敏感性可达到1∶6400,与鸡传染性支气管炎病毒、鸡传染性法氏囊病病毒、鸡传染性喉气管炎病毒均无交叉反应,特异性良好,批间批内重复性变异系数均<10%,在100份临床血清中阳性检出率为77%,与商品化试剂盒检出符合率可达98%。综上,建立的ELISA抗体检测方法可以用于禽腺病毒4型临床抗体检测。 展开更多
关键词 禽腺病毒血清4 Penton蛋白 间接ELISA 抗体检测
下载PDF
NONHSAT248596.1内源性竞争miR-146a-5p调控骨关节炎软骨退变的机制
2
作者 杨光 李彦林 +6 位作者 王国梁 宁梓文 杨腾云 何任杰 熊波涵 杨兵 李黎 《中国组织工程研究》 CAS 北大核心 2024年第16期2512-2518,共7页
背景:目前已有针对lncRNA\miRNA\mRNA的共表达网络对骨关节炎发生发展调控机制的研究,课题组前期研究已通过数据库筛选出符合条件的NONHSAT248596.1和miR-146a-5p,尚缺乏体内实验来验证上述调控机制。目的:探究NONHSAT248596.1在基质细... 背景:目前已有针对lncRNA\miRNA\mRNA的共表达网络对骨关节炎发生发展调控机制的研究,课题组前期研究已通过数据库筛选出符合条件的NONHSAT248596.1和miR-146a-5p,尚缺乏体内实验来验证上述调控机制。目的:探究NONHSAT248596.1在基质细胞衍生因子1/4型趋化因子受体轴介导体内骨关节炎软骨退变进程中对miR-146a-5p发挥的竞争性内源性RNA调控作用。方法:取36只新西兰兔,通过向右侧后肢膝关节注射基质细胞衍生因子1溶液建立骨关节炎模型,采用随机数字表法分4组,lncRNA组、miRNA组、ceRNA组、对照组分别向造模膝关节内注射NONHSAT248596.1过表达的慢病毒载体、miR-146a-5p过表达的慢病毒载体、miR-146a-5p+NONHSAT248596.1过表达的慢病毒载体及空慢病毒载体。造模第4,8,12周,取膝关节软骨组织和软骨下骨组织进行相关检测。结果与结论:①苏木精-伊红与番红O固绿染色显示,4组软骨组织都有不同程度的退变表现,造模第4周时,lncRNA组软骨组织中的软骨细胞肿胀、细胞极性消失,细胞外基质破坏,出现表层糜烂、裂缝形成和软骨组织局部或全层缺失,并随时间延长软骨损伤程度逐渐加重,4组中miRNA组关节软骨炎症进展最缓慢;②qRT-PCR检测显示,相同时间点下,lncRNA组软骨组织中NONHSAT248596.1、4型趋化因子受体、基质金属蛋白酶3,9及13的mRNA表达量高于其他3组(P<0.05),miR-146a-5p、聚集蛋白聚糖及Ⅱ型胶原的mRNA表达量低于其他3组(P<0.05);造模后第8,12周,miRNA组软骨组织中的NONHSAT248596.1、4型趋化因子受体、基质金属蛋白酶3,9及13的mRNA表达量低于ceRNA组、对照组(P<0.05),miR-146a-5p、聚集蛋白聚糖及Ⅱ型胶原的mRNA表达量高于ceRNA组、对照组(P<0.05);③Western Blot检测显示,相同时间点下,lncRNA组软骨组织中的聚集蛋白聚糖及Ⅱ型胶原蛋白表达量始终低于其他3组(P<0.05);miRNA组造模后第8,12周软骨组织中的聚集蛋白聚糖及Ⅱ型胶原蛋白表达量高于ceRNA组、对照组(P<0.05);④结果表明,miR-146a-5p作为NONHSAT248596.1的作用靶点会受到其竞争性内源性RNA的作用造成活性被抑制,NONHSAT248596.1作用于miR-146a-5p后调控基质细胞衍生因子1/4型趋化因子受体轴,影响骨关节炎软骨组织中基质金属蛋白、Ⅱ型胶原、聚集蛋白聚糖的表达,造成细胞外基质的降解及蛋白多糖的丢失。 展开更多
关键词 骨关节炎 lncRNA(NonHSAT248596.1) miR-146a-5p 基质细胞衍生因子1(SDF-1) 4型趋化因子受体(CXCR4) 软骨退变
下载PDF
磺胺嘧啶和磺胺二甲基嘧啶在纳米Fe_(3)O_(4)-nZVI类Fenton体系中的降解效果
3
作者 钟金魁 谢亚瑞 +2 位作者 李闻青 谢欣卓 张子涵 《环境化学》 CAS CSCD 北大核心 2024年第9期3183-3193,共11页
用Fe_(3)O_(4)负载纳米零价铁(Fe_(3)O_(4)-nZVI)作为非均相催化剂,与H2O_(2)耦合构建类Fenton体系,以降解水中磺胺嘧啶(SDZ)和磺胺二甲基嘧啶(SMT).通过SEM、EDS、XRD和XPS对Fe_(3)O_(4)-nZVI材料进行了表征,并考察了Fe_(3)O_(4)-nZVI... 用Fe_(3)O_(4)负载纳米零价铁(Fe_(3)O_(4)-nZVI)作为非均相催化剂,与H2O_(2)耦合构建类Fenton体系,以降解水中磺胺嘧啶(SDZ)和磺胺二甲基嘧啶(SMT).通过SEM、EDS、XRD和XPS对Fe_(3)O_(4)-nZVI材料进行了表征,并考察了Fe_(3)O_(4)-nZVI类Fenton体系中H2O_(2)浓度、Fe_(3)O_(4)-nZVI投加量、初始pH及Fe_(3)O_(4)-nZVI循环使用次数对SDZ和SMT降解效果的影响.结果表明,在25℃,SDZ和SMT初始浓度均为10 mg·L^(-1),H2O_(2)浓度分别为10 mmol·L^(-1)(SDZ)和15 mmol·L^(-1)(SMT),Fe_(3)O_(4)-nZVI投加量为0.8 g·L^(-1),初始pH为3的优化条件下,在180 min时,Fe_(3)O_(4)-nZVI类Fenton体系对水中SDZ和SMT的降解率分别为97.45%和95.51%,Fe_(3)O_(4)-nZVI重复利用4次后,对SDZ和SMT的降解率仍保持在87%以上,表明该材料具有良好的磁回收利用性能.拟一级动力学拟合参数R2均在0.93以上,表明Fe_(3)O_(4)-nZVI类Fenton法对SDZ和SMT的降解过程均符合拟一级动力学方程.且在各因素最优条件下,SDZ的反应速率常数均大于SMT的反应速率常数,这可能与二者的理化性质及分子结构有关,即磺胺类抗生素(SAs)的pKa值和水溶解度越小,疏水性越强,杂环基团上的甲基取代基数目越少,SAs越容易被降解. 展开更多
关键词 Fe_(3)O_(4)-nZVI 类Fenton 磺胺嘧啶 磺胺二甲基嘧啶 抗生素
下载PDF
Silent information regulator sirtuin 1 ameliorates acute liver failure via the p53/glutathione peroxidase 4/gasdermin D axis 被引量:6
4
作者 Xing-Nian Zhou Quan Zhang +6 位作者 Hong Peng Yu-Jie Qin Yu-Hong Liu Lu Wang Ming-Liang Cheng Xin-Hua Luo Hong Li 《World Journal of Gastroenterology》 SCIE CAS 2024年第11期1588-1608,共21页
BACKGROUND Acute liver failure(ALF)has a high mortality with widespread hepatocyte death involving ferroptosis and pyroptosis.The silent information regulator sirtuin 1(SIRT1)-mediated deacetylation affects multiple b... BACKGROUND Acute liver failure(ALF)has a high mortality with widespread hepatocyte death involving ferroptosis and pyroptosis.The silent information regulator sirtuin 1(SIRT1)-mediated deacetylation affects multiple biological processes,including cellular senescence,apoptosis,sugar and lipid metabolism,oxidative stress,and inflammation.AIM To investigate the association between ferroptosis and pyroptosis and the upstream regulatory mechanisms.METHODS This study included 30 patients with ALF and 30 healthy individuals who underwent serum alanine aminotransferase(ALT)and aspartate aminotransferase(AST)testing.C57BL/6 mice were also intraperitoneally pretreated with SIRT1,p53,or glutathione peroxidase 4(GPX4)inducers and inhibitors and injected with lipopolysaccharide(LPS)/D-galactosamine(D-GalN)to induce ALF.Gasdermin D(GSDMD)^(-/-)mice were used as an experimental group.Histological changes in liver tissue were monitored by hematoxylin and eosin staining.ALT,AST,glutathione,reactive oxygen species,and iron levels were measured using commercial kits.Ferroptosis-and pyroptosis-related protein and mRNA expression was detected by western blot and quantitative real-time polymerase chain reaction.SIRT1,p53,and GSDMD were assessed by immunofluorescence analysis.RESULTS Serum AST and ALT levels were elevated in patients with ALF.SIRT1,solute carrier family 7a member 11(SLC7A11),and GPX4 protein expression was decreased and acetylated p5,p53,GSDMD,and acyl-CoA synthetase long-chain family member 4(ACSL4)protein levels were elevated in human ALF liver tissue.In the p53 and ferroptosis inhibitor-treated and GSDMD^(-/-)groups,serum interleukin(IL)-1β,tumour necrosis factor alpha,IL-6,IL-2 and C-C motif ligand 2 levels were decreased and hepatic impairment was mitigated.In mice with GSDMD knockout,p53 was reduced,GPX4 was increased,and ferroptotic events(depletion of SLC7A11,elevation of ACSL4,and iron accumulation)were detected.In vitro,knockdown of p53 and overexpression of GPX4 reduced AST and ALT levels,the cytostatic rate,and GSDMD expression,restoring SLC7A11 depletion.Moreover,SIRT1 agonist and overexpression of SIRT1 alleviated acute liver injury and decreased iron deposition compared with results in the model group,accompanied by reduced p53,GSDMD,and ACSL4,and increased SLC7A11 and GPX4.Inactivation of SIRT1 exacerbated ferroptotic and pyroptotic cell death and aggravated liver injury in LPS/D-GalNinduced in vitro and in vivo models.CONCLUSION SIRT1 activation attenuates LPS/D-GalN-induced ferroptosis and pyroptosis by inhibiting the p53/GPX4/GSDMD signaling pathway in ALF. 展开更多
关键词 Silent information regulator sirtuin 1 Ferroptosis PYROPTOSIS p53/glutathione peroxidase 4/gasdermin D Acute liver failure
下载PDF
禽腺病毒血清4型Hexon蛋白的转录组学功能分析
5
作者 冯慧霞 刘梦渊 +5 位作者 王晨阳 李炜 孙子龙 席义博 张鼎 杨勃 《核农学报》 CAS CSCD 北大核心 2024年第7期1281-1290,共10页
禽腺病毒血清4型(FAdV-4)是引起禽肝炎-心包积液综合征的重要病原,严重危害我国养禽业的发展。研究表明,FAdV-4六邻体(Hexon)蛋白是决定病毒毒力和致病性的重要因素之一。为了进一步探究Hexon蛋白在FAdV-4感染中的重要作用,本试验以鸡... 禽腺病毒血清4型(FAdV-4)是引起禽肝炎-心包积液综合征的重要病原,严重危害我国养禽业的发展。研究表明,FAdV-4六邻体(Hexon)蛋白是决定病毒毒力和致病性的重要因素之一。为了进一步探究Hexon蛋白在FAdV-4感染中的重要作用,本试验以鸡肝癌细胞(LMH)为研究模型,利用转录组测序技术对外源表达Hexon所诱导的差异表达基因进行筛选。结果显示,与对照组相比,外源表达Hexon试验组共筛选到445个差异基因表达上调,36个差异基因表达下调。其中,BAG3、JUN、IL8L1、CCL4和THBS1等基因之前已被报道与FAdV-4感染相关,但HSPB9、HSP90AA1、HSPA8、HSPA2、DCN、ELOVL3和SBK2等基因在FAdV-4感染中的作用还未被揭示。GO富集分析结果显示,下调的差异基因主要与早期内体和蛋白酶体附属复合体相关,而上调的差异基因主要与质膜、细胞外表面区域和超分子纤维相关。KEGG通路富集分析结果显示,差异表达基因主要富集在MAPK、Wnt和VEGF等信号通路。此外,通过蛋白质相互作用网络分析发现,HSP90AA1、HSPA8、JUN和DCN等多个关键蛋白位于整个网络中心且已被报道与多种病毒复制密切相关。综上所述,本研究通过转录组测序筛选出一系列由外源表达Hexon诱导的差异表达基因,为控制FAdV-4感染提供了新的靶点和理论依据。 展开更多
关键词 禽腺病毒血清4 六邻体蛋白 鸡肝癌细胞 转录组测序
下载PDF
Malvidin Mitigates Sepsis-induced Cardiac Injury by Modulating the TLR4-iNOS-COX-2 Inflammatory Pathway and the Bax/Bcl-2/Cyto-C Mitochondrial Apoptosis Pathway in a p38 MAPK-dependent Manner 被引量:1
6
作者 ZHANG Wei YUAN Si Long +4 位作者 QIANG Jing Chao HUANG He LI Da SUN Ying ZHANG Hong Gang 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2024年第2期221-227,共7页
In critical care medicine,sepsis is a dangerous systemic condition that is highly prevalent and is associated with high morbidity and mortality rates^([1]).The high mortality rate associated with sepsis is closely rel... In critical care medicine,sepsis is a dangerous systemic condition that is highly prevalent and is associated with high morbidity and mortality rates^([1]).The high mortality rate associated with sepsis is closely related to multi-organ dysfunction,with heart injury being particularly critical and considered the starting point of multi-organ injury^([2]). 展开更多
关键词 MORTALITY Apoptosis TLR4
下载PDF
Decade Milestone Advancement of Defect-Engineered g-C_(3)N_(4) for Solar Catalytic Applications 被引量:2
7
作者 Shaoqi Hou Xiaochun Gao +8 位作者 Xingyue Lv Yilin Zhao Xitao Yin Ying Liu Juan Fang Xingxing Yu Xiaoguang Ma Tianyi Ma Dawei Su 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第4期153-218,共66页
Over the past decade, graphitic carbon nitride(g-C_(3)N_(4)) has emerged as a universal photocatalyst toward various sustainable carbo-neutral technologies. Despite solar applications discrepancy, g-C_(3)N_(4) is stil... Over the past decade, graphitic carbon nitride(g-C_(3)N_(4)) has emerged as a universal photocatalyst toward various sustainable carbo-neutral technologies. Despite solar applications discrepancy, g-C_(3)N_(4) is still confronted with a general fatal issue of insufficient supply of thermodynamically active photocarriers due to its inferior solar harvesting ability and sluggish charge transfer dynamics. Fortunately, this could be significantly alleviated by the “all-in-one” defect engineering strategy, which enables a simultaneous amelioration of both textural uniqueness and intrinsic electronic band structures. To this end, we have summarized an unprecedently comprehensive discussion on defect controls including the vacancy/non-metallic dopant creation with optimized electronic band structure and electronic density, metallic doping with ultraactive coordinated environment(M–N_(x), M–C_(2)N_(2), M–O bonding), functional group grafting with optimized band structure, and promoted crystallinity with extended conjugation π system with weakened interlayered van der Waals interaction. Among them, the defect states induced by various defect types such as N vacancy, P/S/halogen dopants, and cyano group in boosting solar harvesting and accelerating photocarrier transfer have also been emphasized. More importantly, the shallow defect traps identified by femtosecond transient absorption spectra(fs-TAS) have also been highlighted. It is believed that this review would pave the way for future readers with a unique insight into a more precise defective g-C_(3)N_(4) “customization”, motivating more profound thinking and flourishing research outputs on g-C_(3)N_(4)-based photocatalysis. 展开更多
关键词 Defect engineering g-C_(3)N_(4) Electronic band structures Photocarrier transfer kinetics Defect states
下载PDF
Photocatalytic activation of sulfite by N-doped porous biochar/MnFe_(2)O_(4) interface-driven catalyst for efficient degradation of tetracycline 被引量:1
8
作者 Long Cheng Yuanhui Ji 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第3期481-494,共14页
A novel photo-catalytic system composed of N-doped biochars(NBCs),MnFe_(2)O_(4) and sulfite activation under ultraviolet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constructed to realize the efficient eliminate of tetracycline... A novel photo-catalytic system composed of N-doped biochars(NBCs),MnFe_(2)O_(4) and sulfite activation under ultraviolet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constructed to realize the efficient eliminate of tetracycline(TC).As the carrier of MnFe_(2)O_(4),NBCs were synthesized from alfalfa,which has large specific surface area,graphite like structure and hierarchical porous structure.The adsorption isotherm indicated that NBCs/MnFe_(2)O_(4)-2:1 had the best adsorption performance for TC(347.56 mg g^(-1)).Through synergistic adsorption and photocatalysis,the removal rate of TC reached 84%,which was significantly higher than that of MnFe_(2)O_(4).Electrochemical impedance spectroscopy(EIS)and Photoluminescence(PL)characterization results showed that the introduction of NBCs improved the separation efficiency of photogenerated electron and hole pairs and enhanced the photocatalytic performance.Moreover,the adsorption,degradation mechanism and degradation path of TC by the catalyst were systematically analyzed by coupling HPLC–MS measurement with the theoretical calculation.Considering the advantages of excellent degradation performance,low cost,easy separation and environmental friendliness of NBCs/MnFe_(2)O_(4),this work was expected to provide a new path for the practical application of biochar. 展开更多
关键词 BIOCHAR MnFe_(2)O_(4) SULFITE Adsorption PHOTOCATALYSIS
下载PDF
N-doped graphene quantum dot-decorated N-TiO2/P-doped porous hollow g-C_(3)N_(4) nanotube composite photocatalysts for antibiotic photodegradation and H2 production 被引量:2
9
作者 Jingshu Yuan Yao Zhang +2 位作者 Xiaoyan Zhang Junjie Zhang Shen’gen Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期165-178,共14页
Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology r... Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology regulation, and heterojunction construction strategies to synthesize N-GQD/N-doped TiO_(2)/P-doped porous hollow g-C_(3)N_(4) nanotube (PCN) composite photocatalysts (denoted as G-TPCN). The optimal sample (G-TPCN doped with 0.1wt% N-GQD, denoted as 0.1% G-TPCN) exhibits significantly enhanced photoabsorption, which is attributed to the change in bandgap caused by elemental doping (P and N), the improved light-harvesting resulting from the tube structure, and the upconversion effect of N-GQDs. In addition, the internal charge separation and transfer capability of0.1% G-TPCN are dramatically boosted, and its carrier concentration is 3.7, 2.3, and 1.9 times that of N-TiO_(2), PCN, and N-TiO_(2)/PCN(TPCN-1), respectively. This phenomenon is attributed to the formation of Z-scheme heterojunction between N-TiO_(2) and PCNs, the excellent electron conduction ability of N-GQDs, and the short transfer distance caused by the porous nanotube structure. Compared with those of N-TiO_(2), PCNs, and TPCN-1, the H2 production activity of 0.1%G-TPCN under visible light is enhanced by 12.4, 2.3, and 1.4times, respectively, and its ciprofloxacin (CIP) degradation rate is increased by 7.9, 5.7, and 2.9 times, respectively. The optimized performance benefits from excellent photoresponsiveness and improved carrier separation and migration efficiencies. Finally, the photocatalytic mechanism of 0.1% G-TPCN and five possible degradation pathways of CIP are proposed. This study clarifies the mechanism of multiple modification strategies to synergistically improve the photocatalytic performance of 0.1% G-TPCN and provides a potential strategy for rationally designing novel photocatalysts for environmental remediation and solar energy conversion. 展开更多
关键词 N-doped TiO_(2) N-doped graphene quantum dots P-doped g-C_(3)N_(4) porous hollow nanotube heterojunction photocatalysis
下载PDF
Electrochemical Hydrogen Charging on Corrosion Behavior of Ti-6Al-4V Alloy in Artificial Seawater 被引量:1
10
作者 Yanxin Qiao Yue Qin +5 位作者 Huiling Zhou Lanlan Yang Xiaojing Wang Zhengbin Wang Zhenguang Liu Jiasheng Zou 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第1期296-308,共13页
This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The ... This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The findings revealed the formation ofγ-TiH andδ-TiH_(2) hydrides in the alloy after hydrogen charging.Prolonging hydrogen charging resulted in more significant degradation of the alloy microstructure,leading to deteriorated protectiveness of the surface film.This trend was further confirmed by the electrochemical measurements,which showed that the corrosion resistance of the alloy progressively worsened as the hydrogen charging time was increased.Consequently,this work provides valuable insights into the mechanisms underlying the corrosion of Ti-6Al-4V alloy under hydrogen charging conditions. 展开更多
关键词 Ti-6Al-4V alloy Hydrogen charging Electrochemical corrosion Passive film
下载PDF
Role of methoxy and C_(α)-based substituents in electrochemical oxidation mechanisms and bond cleavage selectivity of β-O-4 lignin model compounds 被引量:1
11
作者 Yang Zhou Qiang Zeng +3 位作者 Hongyan He Kejia Wu Fuqiao Liu Xuehui Li 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第1期114-125,共12页
In order to better understand the specific substituent effects on the electrochemical oxidation process of β-O-4 bond, a series of methoxyphenyl type β-O-4 dimer model compounds with different localized methoxyl gro... In order to better understand the specific substituent effects on the electrochemical oxidation process of β-O-4 bond, a series of methoxyphenyl type β-O-4 dimer model compounds with different localized methoxyl groups, including 2-(2-methoxyphenoxy)-1-phenylethanone, 2-(2-methoxyphenoxy)-1-phenylethanol, 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl)ethanone, 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl)ethanol, 2-(2,6-dimethoxyphenoxy)-1-(4-methoxyphenyl)ethanone, 2-(2,6-dimethoxyphenoxy)-1-(4-methoxyphenyl)ethanol have been selected and their electrochemical properties have been studied experimentally by cyclic voltammetry, and FT-IR spectroelectrochemistry. Combining with electrolysis products distribution analysis and density functional theory calculations, oxidation mechanisms of all six model dimers have been explored. In particular, a total effect from substituents of both para-methoxy(on the aryl ring closing to Cα) and Cα-OH on the oxidation mechanisms has been clearly observed, showing a significant selectivity on the Cα-Cβbond cleavage induced by electrochemical oxidations. 展开更多
关键词 Lignin model compounds β-O-4 dimers Electrochemical oxidation Oxidation mechanisms Substituent effect
下载PDF
MicroRNA-630 alleviates inflammatory reactions in rats with diabetic kidney disease by targeting toll-like receptor 4 被引量:2
12
作者 Qi-Shun Wu Dan-Na Zheng +3 位作者 Cheng Ji Hui Qian Juan Jin Qiang He 《World Journal of Diabetes》 SCIE 2024年第3期488-501,共14页
BACKGROUND Diabetic kidney disease(DKD)is a major complication of diabetes mellitus.Renal tubular epithelial cell(TEC)damage,which is strongly associated with the inflammatory response and mesenchymal trans-differenti... BACKGROUND Diabetic kidney disease(DKD)is a major complication of diabetes mellitus.Renal tubular epithelial cell(TEC)damage,which is strongly associated with the inflammatory response and mesenchymal trans-differentiation,plays a significant role in DKD;However,the precise molecular mechanism is unknown.The recently identified microRNA-630(miR-630)has been hypothesized to be closely associated with cell migration,apoptosis,and autophagy.However,the association between miR-630 and DKD and the underlying mechanism remain unknown.AIM To investigate how miR-630 affects TEC injury and the inflammatory response in DKD rats.METHODS Streptozotocin was administered to six-week-old male rats to create a hypergly cemic diabetic model.In the second week of modeling,the rats were divided into control,DKD,negative control of lentivirus,and miR-630 overexpression groups.After 8 wk,urine and blood samples were collected for the kidney injury assays,and renal tissues were removed for further molecular assays.The target gene for miR-630 was predicted using bioinformatics,and the association between miR-630 and toll-like receptor 4(TLR4)was confirmed using in vitro investigations and double luciferase reporter gene assays.Overexpression of miR-630 in DKD rats led to changes in body weight,renal weight index,basic blood parameters and histopathological changes.RESULTS The expression level of miR-630 was reduced in the kidney tissue of rats with DKD(P<0.05).The miR-630 and TLR4 expressions in rat renal TECs(NRK-52E)were measured using quantitative reverse transcription polymerase chain reaction.The mRNA expression level of miR-630 was significantly lower in the high-glucose(HG)and HG+mimic negative control(NC)groups than in the normal glucose(NG)group(P<0.05).In contrast,the mRNA expression level of TLR4 was significantly higher in these groups(P<0.05).However,miR-630 mRNA expression increased and TLR4 mRNA expression significantly decreased in the HG+miR-630 mimic group than in the HG+mimic NC group(P<0.05).Furthermore,the levels of tumor necrosis factor-alpha(TNF-α),interleukin-1β(IL-1β),and IL-6 were significantly higher in the HG and HG+mimic NC groups than in NG group(P<0.05).However,the levels of these cytokines were significantly lower in the HG+miR-630 mimic group than in the HG+mimic NC group(P<0.05).Notably,changes in protein expression were observed.The HG and HG+mimic NC groups showed a significant decrease in E-cadherin protein expression,whereas TLR4,α-smooth muscle actin(SMA),and collagen IV protein expression increased(P<0.05).Conversely,the HG+miR-630 mimic group exhibited a significant increase in E-cadherin protein expression and a notable decrease in TLR4,α-SMA,and collagen IV protein expression than in the HG+mimic NC group(P<0.05).The miR-630 targets TLR4 gene expression.In vivo experiments demonstrated that DKD rats treated with miR-630 agomir exhibited significantly higher miR-630 mRNA expression than DKD rats injected with agomir NC.Additionally,rats treated with miR-630 agomir showed significant reductions in urinary albumin,blood glucose,TLR4,and proinflammatory markers(TNF-α,IL-1β,and IL-6)expression levels(P<0.05).Moreover,these rats exhibited fewer kidney lesions and reduced infiltration of inflammatory cells.CONCLUSION MiR-630 may inhibit the inflammatory reaction of DKD by targeting TLR4,and has a protective effect on DKD. 展开更多
关键词 Diabetic kidney disease MicroRNA-630 Toll-like receptor 4 Mouse model Renal tubular epithelial cells damage Hyperglycemic model
下载PDF
ZnONP/g-C_(3)N_(4)柱撑结构复合材料构建及NO光氧化脱除研究
13
作者 张博川 许磊 +3 位作者 谢诚 孙永芬 叶千钧 刘燕芝 《工程科学学报》 EI CSCD 北大核心 2024年第11期2046-2054,共9页
随着现代工业的飞速发展,如何实现氮氧化物的有效脱除成为目前亟待解决的重要难题.本研究提出了一种在石墨相氮化碳(g-C_(3)N_(4))表面原位生长纳米氧化锌点阵构建柱撑结构复合材料策略,以实现在可见光下光氧化去除NO.通过离子吸附反应... 随着现代工业的飞速发展,如何实现氮氧化物的有效脱除成为目前亟待解决的重要难题.本研究提出了一种在石墨相氮化碳(g-C_(3)N_(4))表面原位生长纳米氧化锌点阵构建柱撑结构复合材料策略,以实现在可见光下光氧化去除NO.通过离子吸附反应,成功制备了不同氧化锌颗粒负载量的ZnO NP/g-C_(3)N_(4)柱撑结构复合光氧化剂,并对其结构和电子特性进行了研究.结果表明,氧化锌纳米颗粒(ZnO NP)的引入改善了g-C_(3)N_(4)的团聚,提高了比表面积,暴露出更多活性位点.异质结构的构建改善了复合材料能带结构,促进了光生载流子的迁移及分离,光氧化性能显著提升.在可见光照射下质量分数为2.5%的ZnO NP/g-C_(3)N_(4)样品展现出了优异的光氧化性能,对NO体积分数为3×10^(-5)%以下的混合空气光氧化去除表现出优良的高效稳定性.本研究为高性能光氧化剂的设计与构建提供了有效策略,并为消除工业NO污染物提供了技术参考. 展开更多
关键词 g-C_(3)N_(4) ZNO 纳米材料 光氧化 NO脱除
下载PDF
Recent progress on Sn_(3)O_(4)nanomaterials for photocatalytic applications 被引量:1
14
作者 Xin Yu Congcong Li +3 位作者 Jian Zhang Lili Zhao Jinbo Pang Longhua Ding 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第2期231-244,共14页
Tin(IV)oxide(Sn_(3)O_(4))is layered tin and exhibits mixed valence states.It has emerged as a highly promising visible-light pho-tocatalyst,attracting considerable attention.This comprehensive review is aimed at provi... Tin(IV)oxide(Sn_(3)O_(4))is layered tin and exhibits mixed valence states.It has emerged as a highly promising visible-light pho-tocatalyst,attracting considerable attention.This comprehensive review is aimed at providing a detailed overview of the latest advance-ments in research,applications,advantages,and challenges associated with Sn_(3)O_(4)photocatalytic nanomaterials.The fundamental con-cepts and principles of Sn_(3)O_(4)are introduced.Sn_(3)O_(4)possesses a unique crystal structure and optoelectronic properties that allow it to ab-sorb visible light efficiently and generate photoexcited charge carriers that drive photocatalytic reactions.Subsequently,strategies for the control and improved performance of Sn_(3)O_(4)photocatalytic nanomaterials are discussed.Morphology control,ion doping,and hetero-structure construction are widely employed in the optimization of the photocatalytic performance of Sn_(3)O_(4)materials.The effective imple-mentation of these strategies improves the photocatalytic activity and stability of Sn_(3)O_(4)nanomaterials.Furthermore,the review explores the diverse applications of Sn_(3)O_(4)photocatalytic nanomaterials in various fields,such as photocatalytic degradation,photocatalytic hydro-gen production,photocatalytic reduction of carbon dioxide,solar cells,photocatalytic sterilization,and optoelectronic sensors.The discus-sion focuses on the potential of Sn_(3)O_(4)-based nanomaterials in these applications,highlighting their unique attributes and functionalities.Finally,the review provides an outlook on the future development directions in the field and offers guidance for the exploration and de-velopment of novel and efficient Sn_(3)O_(4)-based nanomaterials.Through the identification of emerging research areas and potential avenues for improvement,this review aims to stimulate further advancements in Sn_(3)O_(4)-based photocatalysis and facilitate the translation of this promising technology into practical applications. 展开更多
关键词 PHOTOCATALYSIS Sn_(3)O_(4)nanomaterials building heterostructures antibacterial therapy water splitting
下载PDF
Li-promoted C_(3)N_(4) catalyst for efficient isomerization of glucose into fructose at 50℃ in water 被引量:1
15
作者 Wang Liu Yanfei Zhang +5 位作者 Mengya Sun Xinpeng Zhao Shenggang Li Xinqing Chen Liangshu Zhong Lingzhao Kong 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第9期1419-1426,共8页
Efficient and selective glucose-to-fructose isomerization is a crucial step for production of oxygenated chemicals derived from sugars,which is usually catalyzed by base or Lewis acid heterogeneous catalyst.However,hi... Efficient and selective glucose-to-fructose isomerization is a crucial step for production of oxygenated chemicals derived from sugars,which is usually catalyzed by base or Lewis acid heterogeneous catalyst.However,high yield and selectivity of fructose cannot be simultaneously obtained under mild conditions which hamper the scale of application compared with enzymatic catalysis.Herein,a Li-promoted C_(3)N_(4) catalyst was exploited which afforded an excellent fructose yield(40.3 wt%)and selectivity(99.5%)from glucose in water at 50℃,attributed to the formation of stable Li–N bond to strengthen the basic sites of catalysts.Furthermore,the so-formed N_(6)–Li–H_(2)O active site on Li–C_(3)N_(4) catalyst in aqueous phase changes the local electronic structure and strengthens the deprotonation process during glucose isomerization into fructose.The superior catalytic performance which is comparable to biological pathway suggests promising applications of lithium containing heterogeneous catalyst in biomass refinery. 展开更多
关键词 GLUCOSE FRUCTOSE ISOMERIZATIon Li–C_(3)N_(4) Density functional theory calculations
下载PDF
Constructing long-cycling crystalline C_(3)N_(4)-based carbonaceous anodes for sodium-ion battery via N configuration control 被引量:1
16
作者 Ying Wang Hongguan Li +5 位作者 Shuanlong Di Boyin Zhai Ping Niu Antonios Kelarakis Shulan Wang Li Li 《Carbon Energy》 SCIE EI CAS CSCD 2024年第1期159-171,共13页
Carbon nitrides with two-dimensional layered structures and high theoretical capacities are attractive as anode materials for sodium-ion batteries while their low crystallinity and insufficient structural stability st... Carbon nitrides with two-dimensional layered structures and high theoretical capacities are attractive as anode materials for sodium-ion batteries while their low crystallinity and insufficient structural stability strongly restrict their practical applications.Coupling carbon nitrides with conductive carbon may relieve these issues.However,little is known about the influence of nitrogen(N)configurations on the interactions between carbon and C_(3)N_(4),which is fundamentally critical for guiding the precise design of advanced C_(3)N_(4)-related electrodes.Herein,highly crystalline C_(3)N_(4)(poly(triazine imide),PTI)based all-carbon composites were developed by molten salt strategy.More importantly,the vital role of pyrrolic-N for enhancing charge transfer and boosting Na+storage of C_(3)N_(4)-based composites,which was confirmed by both theoretical and experimental evidence,was spot-highlighted for the first time.By elaborately controlling the salt composition,the composite with high pyrrolic-N and minimized graphitic-N content was obtained.Profiting from the formation of highly crystalline PTI and electrochemically favorable pyrrolic-N configurations,the composite delivered an unusual reverse growth and record-level cycling stability even after 5000 cycles along with high reversible capacity and outstanding full-cell capacity retention.This work broadens the energy storage applications of C_(3)N_(4) and provides new prospects for the design of advanced all-carbon electrodes. 展开更多
关键词 ANODE highly crystalline C_(3)N_(4) N configuration sodium-ion batteries ultra-long cyclic stability
下载PDF
Clinical outcome and prognostic factors of T4N0M0 colon cancer after R0 resection:A retrospective study 被引量:1
17
作者 Bang Liu Zhao-Xiong Zhang +3 位作者 Xin-Yang Nie Wei-Lin Sun Yong-Jia Yan Wei-Hua Fu 《World Journal of Gastrointestinal Oncology》 SCIE 2024年第5期1869-1877,共9页
BACKGROUND Paradoxically,patients with T4N0M0(stage II,no lymph node metastasis)colon cancer have a worse prognosis than those with T2N1-2M0(stage III).However,no previous report has addressed this issue.AIM To screen... BACKGROUND Paradoxically,patients with T4N0M0(stage II,no lymph node metastasis)colon cancer have a worse prognosis than those with T2N1-2M0(stage III).However,no previous report has addressed this issue.AIM To screen prognostic risk factors for T4N0M0 colon cancer and construct a prognostic nomogram model for these patients.METHODS Two hundred patients with T4N0M0 colon cancer were treated at Tianjin Medical University General Hospital between January 2017 and December 2021,of which 112 patients were assigned to the training cohort,and the remaining 88 patients were assigned to the validation cohort.Differences between the training and validation groups were analyzed.The training cohort was subjected to multi-variate analysis to select prognostic risk factors for T4N0M0 colon cancer,followed by the construction of a nomogram model.RESULTS The 3-year overall survival(OS)rates were 86.2%and 74.4%for the training and validation cohorts,respectively.Enterostomy(P=0.000),T stage(P=0.001),right hemicolon(P=0.025),irregular review(P=0.040),and carbohydrate antigen 199(CA199)(P=0.011)were independent risk factors of OS in patients with T4N0M0 colon cancer.A nomogram model with good concordance and accuracy was constructed.CONCLUSION Enterostomy,T stage,right hemicolon,irregular review,and CA199 were independent risk factors for OS in patients with T4N0M0 colon cancer.The nomogram model exhibited good agreement and accuracy. 展开更多
关键词 T4N0M0 colon cancer PROGNOSIS Multivariate analysis NOMOGRAM Colon cancer
下载PDF
Chemokine platelet factor 4 accelerates peripheral nerve regeneration by regulating Schwann cell activation and axon elongation 被引量:1
18
作者 Miao Gu Xiao Cheng +3 位作者 Di Zhang Weiyan Wu Yi Cao Jianghong He 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第1期190-195,共6页
Schwann cells in peripheral nerves react to traumatic nerve injury by attempting to grow and regenerate.Howeve r,it is unclear what factors play a role in this process.In this study,we searched a GEO database and foun... Schwann cells in peripheral nerves react to traumatic nerve injury by attempting to grow and regenerate.Howeve r,it is unclear what factors play a role in this process.In this study,we searched a GEO database and found that expression of platelet factor 4 was markedly up-regulated after sciatic nerve injury.Platelet factor is an important molecule in cell apoptosis,diffe rentiation,survival,and proliferation.Further,polymerase chain reaction and immunohistochemical staining confirmed the change in platelet factor 4 in the sciatic nerve at different time points after injury.Enzyme-linked immunosorbent assay confirmed that platelet factor 4 was secreted by Schwann cells.We also found that silencing platelet factor 4 decreased the proliferation and migration of primary cultured Schwann cells,while exogenously applied platelet factor 4 stimulated Schwann cell prolife ration and migration and neuronal axon growth.Furthermore,knocking out platelet factor 4 inhibited the prolife ration of Schwann cells in injured rat sciatic nerve.These findings suggest that Schwann cell-secreted platelet factor 4 may facilitate peripheral nerve repair and regeneration by regulating Schwann cell activation and axon growth.Thus,platelet factor 4 may be a potential therapeutic target for traumatic peripheral nerve injury. 展开更多
关键词 axon elongation bioinformatic analysis cell migration cell proliferation dorsal root ganglia peripheral nerve regeneration peripheral nerve trauma platelet factor 4 rat sciatic nerve Schwann cells
下载PDF
Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4)/C cathode for lithium-ion batteries 被引量:1
19
作者 Wei Lyu Wenlong Cai +5 位作者 Tuan Wang Xiaobo Sun Enhao Xu Jinxuan Chen Kaipeng Wu Yun Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期619-627,共9页
Mn-rich LiFe_(1-x)Mn_(x)PO_(4)(x>0.5),which combines the high operation voltage of LiMnPO_(4)with excellent rate performa nce of LiFePO4,is hindered by its sluggish kinetic properties.Herein,thermodynamic equilibri... Mn-rich LiFe_(1-x)Mn_(x)PO_(4)(x>0.5),which combines the high operation voltage of LiMnPO_(4)with excellent rate performa nce of LiFePO4,is hindered by its sluggish kinetic properties.Herein,thermodynamic equilibrium analysis of Mn^(2+)-Fe^(2+)-Mg^(2+)-C_(2)O_(4)^(2-)-H_(2)O system is used to guide the design and preparation of insitu Mg-doped(Fe_(0.4)Mn_(0.6))_(1-x)Mg_(x)C_(2)O_(4)intermediate,which is then employed as an innovative precursor to synthesize high-performance Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4).It indicates that the metal ions with a high precipitation efficiency and the stoichiometric precursors with uniform element distribution can be achieved under the optimized thermodynamic conditions.Meanwhile,accelerated Li+diffusivity and reduced charge transfer resistance originating from Mg doping are verified by various kinetic characterizations.Benefiting from the contributions of inherited homogeneous element distribution,small particle size,uniform carbon layer coating,enhanced Li+migration ability and structural stability induced by Mg doping,the Li(Fe_(0.4)Mn_(0.6))_(0.97)Mg_(0.03)PO_(4)/C exhibits splendid electrochemical performance. 展开更多
关键词 (Fe_(0.4)Mn_(0.6))_(1-x)MgxC_(2)0_(4) precursors Thermodynami cequilibrium CO-PRECIPITATIon Mg doping Lithium-ion batteries
下载PDF
禽腺病毒4型GZ-B1毒株的Hexon基因序列分析
20
作者 罗青华 罗东还 +1 位作者 温贵兰 徐飞 《贵州畜牧兽医》 2024年第1期54-56,共3页
为了解禽腺病毒4型(FAdV-4)GZ-B1株的遗传进化情况,试验设计合成FAdV-4 Hexon基因的特异引物,对GZ-B1株Hexon基因进行PCR扩增并克隆至pMD-19T载体,基因测序和遗传进化分析。结果:扩增的Hexon基因长度为327 bp,与预期相符。GZ-B1株与国内... 为了解禽腺病毒4型(FAdV-4)GZ-B1株的遗传进化情况,试验设计合成FAdV-4 Hexon基因的特异引物,对GZ-B1株Hexon基因进行PCR扩增并克隆至pMD-19T载体,基因测序和遗传进化分析。结果:扩增的Hexon基因长度为327 bp,与预期相符。GZ-B1株与国内外13株FAdV参考毒株中的7株FAdV-C毒株同源性较高(95.8%~98.5%),其中与国内强毒株GDMZ、LC1611、SDSG、SDXL同源性最高(均为98.5%),与基因型A、B、D、E的6株参考毒株同源性较低(73.0%~77.5%)。遗传进化树显示,GZ-B1株与基因型A、B、D、E毒株处于不同进化分支,与国内外C基因型毒株处于同一进化分支,表明该毒株与C基因型毒株遗传差异较小,其中与国内C型强毒株LC1611的遗传差异最小,亲缘关系最近。结论:FAdV-4 GZ-B1株属于C基因型、血清4型,与国内流行株FAdV-4 LC1611亲缘关系最近,同源性最高。 展开更多
关键词 禽腺病毒4 GZ-B1毒株 Hexon基因 序列分析
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部