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New 4-imino-4H-Chromeno[2,3-d]Pyrimidin-3(5H)-Amine: Synthesis, Cytotoxic Effects on Tumoral Cell Lines and in Silico ADMET Properties
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作者 Marwa Dhiabi Sirine Karoui +7 位作者 Mehdi Fakhfakh Souhir Abid Emmanuelle Limanton Rémy Le Guével Thierry Charlier Ludovic Paquin Jean-Pierre Bazureau Houcine Ammar 《International Journal of Organic Chemistry》 2024年第3期107-122,共16页
The synthesis of new 4-imino-4H-chromeno[2,3-d]pyrimidin-3(5H)-amine in four steps including one step under microwave dielectric heating is reported. The structural identity of the synthesized compounds was establishe... The synthesis of new 4-imino-4H-chromeno[2,3-d]pyrimidin-3(5H)-amine in four steps including one step under microwave dielectric heating is reported. The structural identity of the synthesized compounds was established according to their spectroscopic analysis, such as FT-IR, NMR and mass spectroscopy. These new compounds were tested for their antiproliferative activities on seven representative human tumoral cell lines (Huh7 D12, Caco2, MDA-MB231, MDA-MB468, HCT116, PC3 and MCF7) and also on fibroblasts. Among them, only the compounds 6c showed micromolar cytotoxic activity on tumor cell lines (1.8 50 50 > 25 μM). Finally, in silico ADMET studies ware performed to investigate the possibility of using of the identified compound 6c as potential anti-tumor compound. 展开更多
关键词 2-Amino-4H-Chromene 4H-Chromeno[2 3-d]Pyrimidin-3(5H)-Amine Microwave Irradiation Tumoral Cell Line in Silico ADMET
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miR-139-5p靶向Notch1抑制肺腺癌细胞增殖、迁移和侵袭
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作者 董跃华 王贵刚 +3 位作者 杨燕君 魏玉磊 高永山 姜伟华 《医学分子生物学杂志》 CAS 2024年第5期437-444,共8页
目的探究miR-139-5p在肺腺癌(lung adenocarcinoma,LUAD)进展中的作用和调控机制。方法实时定量PCR(qRT-PCR)和蛋白质印迹检测LUAD组织和细胞中miR-139-5p和Notch同源物1(Notch1)的表达。经细胞转染后,qRT-PCR和蛋白质印迹验证转染效率... 目的探究miR-139-5p在肺腺癌(lung adenocarcinoma,LUAD)进展中的作用和调控机制。方法实时定量PCR(qRT-PCR)和蛋白质印迹检测LUAD组织和细胞中miR-139-5p和Notch同源物1(Notch1)的表达。经细胞转染后,qRT-PCR和蛋白质印迹验证转染效率。CCK-8、细胞划痕和Transwell实验用于检测LUAD细胞的增殖、迁移和侵袭。双荧光素酶报告基因分析miR-139-5p与Notch1的靶向关系。蛋白质印迹检测PI3K/AKT/mTOR信号通路相关蛋白的表达。结果与正常组织和人正常支气管上皮细胞相比,miR-139-5p在LUAD组织和细胞中显著下调(P<0.01),Notch1显著上调(P<0.01)。与对照组相比,过表达miR-139-5p明显抑制LUAD细胞的增殖、迁移和侵袭,并下调p-PI3K、p-AKT和p-mTOR的表达(P<0.01)。Notch1被确定为miR-139-5p的直接靶标。过表达Notch1减弱了miR-139-5p过表达对LUAD细胞增殖、迁移和侵袭的抑制作用(P<0.05)。与对照组比较,miR-139-5p在体内显著抑制了异形移植瘤的生长(P<0.05)。结论miR-139-5p通过靶向Notch1并失活PI3K/Akt/mTOR途径抑制LUAD细胞的增殖、迁移和侵袭。 展开更多
关键词 肺腺癌 miR-139-5p noTCH1 迁移 侵袭
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LncRNA NORAD通过miR-513b-5p/GREM1轴调节颅内动脉瘤血管平滑肌细胞增殖、迁移、侵袭和凋亡的作用机制
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作者 黄锐 陈海浚 +3 位作者 韦总当 秦国文 钟书 庞刚 《中西医结合心脑血管病杂志》 2024年第15期2761-2769,共9页
目的:探讨长链非编码RNA DNA损伤诱导的非编码RNA(LncRNA NORAD)通过miR-513b-5p/GREM1轴调节颅内动脉瘤血管平滑肌细胞(VSMC)增殖、迁移、侵袭和凋亡的机制。方法:采用实时荧光定量聚合酶链式反应(PCR)法检测人颅内动脉瘤组织和正常组... 目的:探讨长链非编码RNA DNA损伤诱导的非编码RNA(LncRNA NORAD)通过miR-513b-5p/GREM1轴调节颅内动脉瘤血管平滑肌细胞(VSMC)增殖、迁移、侵袭和凋亡的机制。方法:采用实时荧光定量聚合酶链式反应(PCR)法检测人颅内动脉瘤组织和正常组织中LncRNA NORAD、miR-513b-5p及GREM1表达。体外分离培养人VSMC,随机分为对照组、LncRNA NORAD siRNA组、miR-513b-5p mimics组、共转染(LncRNA NORAD siRNA+miR-513b-5p inhibitor)组、共转染阴性对照(LncRNA NORAD siRNA阴性对照+miR-513b-5p inhibitor阴性对照)组,分组转染后,采用实时荧光定量PCR法检测各组细胞LncRNA NORAD、miR-513b-5p及GREM1 mRNA表达;采用细胞计数试剂盒(CCK-8)和免疫荧光染色检测各组细胞增殖情况;采用Hoechst 33342染色和免疫荧光染色检测各组细胞凋亡情况;采用细胞划痕实验和Transwell实验检测各组细胞迁移、侵袭情况;采用免疫印记实验检测各组细胞上皮间充质转化(EMT)标志蛋白神经钙黏素(N-cadherin)、E-钙黏素(E-cadherin)、波形蛋白(Vimentin)表达;采用双荧光素酶报告实验分析VSMC中LncRNA NORAD对miR-513b-5p、miR-513b-5p对GREM1的靶向调控。结果:与正常组织比较,颅内动脉瘤组织LncRNA NORAD、GREM1 mRNA表达明显升高(P<0.05),miR-513b-5p表达明显降低(P<0.05)。与对照组比较,LncRNA NORAD siRNA组、miR-513b-5p mimics组细胞GREM1 mRNA表达、增殖率、Ki67阳性率、迁移率、侵袭数及N-cadherin、Vimentin蛋白表达降低(P<0.05),miR-513b-5p表达、凋亡率及Bax/Bcl-2、E-cadherin蛋白表达升高(P<0.05);共转染阴性对照组各指标差异无统计学意义(P>0.05)。与LncRNA NORAD siRNA组比较,共转染组细胞GREM1 mRNA表达、增殖率、Ki67阳性率、迁移率、侵袭数及N-cadherin、Vimentin蛋白表达升高(P<0.05),miR-513b-5p表达、凋亡率及Bax/Bcl-2、E-cadherin蛋白表达降低(P<0.05)。结论:敲低LncRNA NORAD可通过上调miR-513b-5p表达而降低GREM1表达,从而抑制VSMC增殖与侵袭迁移,并促使其凋亡。 展开更多
关键词 颅内动脉瘤 长链非编码RNA DNA损伤诱导的非编码RNA LncRNA noRAD miR-513b-5p GREM1 血管平滑肌细胞 实验研究
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NONHSAT248596.1内源性竞争miR-146a-5p调控骨关节炎软骨退变的机制
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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
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Cu-ZSM-5催化分解NO的机理
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作者 张欢 刘梁 +2 位作者 史一林 乔晓磊 金燕 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2024年第6期831-838,共8页
Cu-ZSM-5催化分解NO具有潜在的应用前景。为揭示NO在Cu-ZSM-5催化剂的催化分解机理,基于密度泛函模拟了NO在Cu-ZSM-5催化剂中短距离Cu+对上的吸附,并提出副产物N_(2)O、NO_(2)辅助催化分解NO的反应路径。计算结果表明,双核铜氧物种是Cu... Cu-ZSM-5催化分解NO具有潜在的应用前景。为揭示NO在Cu-ZSM-5催化剂的催化分解机理,基于密度泛函模拟了NO在Cu-ZSM-5催化剂中短距离Cu+对上的吸附,并提出副产物N_(2)O、NO_(2)辅助催化分解NO的反应路径。计算结果表明,双核铜氧物种是Cu基催化剂的重要活性中心。催化分解NO过程中,副产物NO_(2)在双核铜氧物种上的分解需要的活化能最高(为171.39 kJ/mol),N_(2)O分解需要86.92 kJ/mol的活化能垒,表明NO_(2)在活性位的分解难于N_(2)O的分解。N_(2)、O_(2)的解析分别吸收28.43、100.78 kJ/mol的热量,限速步骤为O_(2)的脱附。NO既作为反应物,同时又是催化过程中CuZSM-5催化剂活性中心实现氧化还原循环的关键还原剂。 展开更多
关键词 CU-ZSM-5 催化分解 双核铜氧物种 氧化还原循环
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5-Aza-CdR通过Notch1通路对小鼠海马神经发生的影响
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作者 王报捷 苏丽晴 +4 位作者 张志勇 闫磊 王志广 包素雅 邵国 《中国比较医学杂志》 CAS 北大核心 2024年第1期34-39,共6页
目的研究5-Aza-CdR对Notch1通路影响及神经再生的影响,并通过小鼠主动回避行为实验来探讨5-Aza-CdR对小鼠学习记忆能力的影响。方法将60只6~8周龄SPF级ICR雄性小鼠分为两组,通过侧脑室注射(i.c.v)给一组小鼠注射5-Aza-CdR,另一组注射BS... 目的研究5-Aza-CdR对Notch1通路影响及神经再生的影响,并通过小鼠主动回避行为实验来探讨5-Aza-CdR对小鼠学习记忆能力的影响。方法将60只6~8周龄SPF级ICR雄性小鼠分为两组,通过侧脑室注射(i.c.v)给一组小鼠注射5-Aza-CdR,另一组注射BSA作为对照组。注射后24 h通过Real-time PCR和Western blot检测Notch1和HES1的mRNA和蛋白表达水平;通过激光共聚焦显微镜观察5-溴-2’-脱氧尿苷(BrdU)阳性细胞和海马DG中Notch1的表达;用MS-PCR检测Notch1甲基化变化;通过穿梭回避实验来评估小鼠的学习和记忆行为。结果注射5-Aza-CdR使海马Notch1通路活性增加并促进DG区神经细胞再生,降低Notch1启动子区甲基化水平,小鼠主动回避行为能力得到提升。结论5-Aza-CdR对小鼠主动回避行为的影响可能与Notch1通路影响海马神经再生有关。 展开更多
关键词 5-AZA-CDR 神经发生 noTCH1 学习和记忆
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基于NOX5-ERK1/2信号通路探讨健脾祛痰化瘀方对动脉粥样硬化小型猪炎症反应的影响 被引量:2
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作者 陆翼 陈向心 +5 位作者 郝秀炜 张铜五 周媛媛 潘奕卉 杨关林 孔德昭 《中国中医药信息杂志》 CAS CSCD 2024年第3期105-112,共8页
目的 观察健脾祛痰化瘀方对动脉粥样硬化(AS)小型猪氧化应激和炎症反应的影响,基于NOX5-ERK1/2信号通路探讨其作用机制。方法 将12只巴马小型猪随机分为对照组、模型组和健脾祛痰化瘀方低、高剂量组,每组3只。采用高脂饮食饲养24周构建... 目的 观察健脾祛痰化瘀方对动脉粥样硬化(AS)小型猪氧化应激和炎症反应的影响,基于NOX5-ERK1/2信号通路探讨其作用机制。方法 将12只巴马小型猪随机分为对照组、模型组和健脾祛痰化瘀方低、高剂量组,每组3只。采用高脂饮食饲养24周构建动脉粥样硬化模型,给药组同时在饲料中添加健脾祛痰化瘀方。分别于给药0、16、24周检测小型猪一般体征(体长、腹围、体质量、食物摄入量和粪便含水量),HE染色观察主动脉形态,油红O染色观察主动脉和心肌组织脂质沉积,透射电镜观察胸主动脉组织超微结构,全自动生化分析仪检测血清总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)含量,ELISA检测血清活性氧(ROS)、白细胞介素(IL)-6、IL-10、肿瘤坏死因子(TNF)-α、超敏C反应蛋白(hs-CRP)、血管细胞黏附分子-1(VCAM-1)、细胞间黏附分子-1(ICAM-1)含量,Western blot检测主动脉组织NADPH氧化酶5(NOX5)、细胞外信号调节激酶1/2(ERK1/2)、p-ERK1/2、VCAM-1、增殖细胞核抗原(PCNA)蛋白表达。结果 与正常组比较,模型组小型猪16、24周腹围、体质量、食物摄入量增加(P<0.01),主动脉内膜明显增厚,内皮细胞破坏,脂质沉积,平滑肌细胞水肿,线粒体肿胀明显,血清TC、LDL-C含量及ROS、IL-6、IL-10、TNF-α、hs-CRP、VCAM-1、ICAM-1含量升高,HDL-C含量降低(P<0.01);主动脉组织NOX5、p-ERK1/2、VCAM-1、PCNA蛋白表达升高(P<0.01)。与模型组比较,健脾祛痰化瘀方低、高剂量组16、24周腹围、体质量、食物摄入量减少(P<0.05,P<0.01),斑块面积和脂质沉积减少,内皮细胞破坏减轻,血清TC、LDL-C含量及ROS、IL-6、IL-10、TNF-α、hs-CRP、VCAM-1、ICAM-1含量降低,HDL-C含量升高(P<0.01,P<0.05);主动脉组织NOX5、p-ERK1/2、VCAM-1、PCNA蛋白表达降低(P<0.01,P<0.05)。结论 健脾祛痰化瘀方可减轻小型猪AS,其机制可能与抑制NOX5-ERK1/2信号通路激活、减轻氧化应激诱导的炎症反应有关。 展开更多
关键词 动脉粥样硬化 健脾祛痰化瘀方 氧化应激 炎症 noX5-ERK1/2信号通路 小型猪
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Reactor field reconstruction from sparse and movable sensors using Voronoi tessellation-assisted convolutional neural networks 被引量:1
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作者 He-Lin Gong Han Li +1 位作者 Dunhui Xiao Sibo Cheng 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第5期173-185,共13页
The aging of operational reactors leads to increased mechanical vibrations in the reactor interior.The vibration of the incore sensors near their nominal locations is a new problem for neutronic field reconstruction.C... The aging of operational reactors leads to increased mechanical vibrations in the reactor interior.The vibration of the incore sensors near their nominal locations is a new problem for neutronic field reconstruction.Current field-reconstruction methods fail to handle spatially moving sensors.In this study,we propose a Voronoi tessellation technique in combination with convolutional neural networks to handle this challenge.Observations from movable in-core sensors were projected onto the same global field structure using Voronoi tessellation,holding the magnitude and location information of the sensors.General convolutional neural networks were used to learn maps from observations to the global field.The proposed method reconstructed multi-physics fields(including fast flux,thermal flux,and power rate)using observations from a single field(such as thermal flux).Numerical tests based on the IAEA benchmark demonstrated the potential of the proposed method in practical engineering applications,particularly within an amplitude of 5 cm around the nominal locations,which led to average relative errors below 5% and 10% in the L_(2) and L_(∞)norms,respectively. 展开更多
关键词 Voronoi tessellation field reconstruction Nuclear reactors Reactor physics On-line monitoring
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基于光腔衰荡光谱技术NO_(3)和N_(2)O_(5)在线测量系统的表征与应用
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作者 张田甜 左澎 +3 位作者 马璟钰 叶春翔 林伟立 朱彤 《北京大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期563-574,共12页
报道自主研发的基于光腔衰荡光谱技术的大气NO_(3)/N_(2)O_(5)在线测量系统及其参数表征结果。在时间分辨率为1min的情况下,NO_(3)和N_(2)O_(5)最低检测限分别为1.7×10^(-12)和2.9×10^(-12)。在采样流量6L/min和使用1天滤膜... 报道自主研发的基于光腔衰荡光谱技术的大气NO_(3)/N_(2)O_(5)在线测量系统及其参数表征结果。在时间分辨率为1min的情况下,NO_(3)和N_(2)O_(5)最低检测限分别为1.7×10^(-12)和2.9×10^(-12)。在采样流量6L/min和使用1天滤膜的情况下,利用标准源实验确定NO_(3)和N_(2)O_(5)的采样损耗分别为17.0%和18.0%。Allan方差分析结果表明,在60~100s积分条件下可获得较好的系统稳定性。在北京城区开展大气NO_(3)和N_(2)O_(5)观测,结果表明测量系统可以满足大气环境中NO_(3)及N_(2)O_(5)的高灵敏度测量。 展开更多
关键词 no_(3) N_(2)O_(5) 光腔衰荡光谱技术 参数表征
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绵羊ANO5基因的生物信息学分析 被引量:1
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作者 代淇佳 马博 +1 位作者 谢凡 张小雪 《寒旱农业科学》 2024年第1期37-42,共6页
作为Anoctamin蛋白家族的第五个成员,ANO5基因主要在绵羊肌肉再生、肌母细胞融合和肌细胞膜修复中发挥作用。为探究ANO5基因在绵羊体内的功能,本研究利用生物信息学软件分析了绵羊ANO5基因及其编码产物的结构与功能。结果显示:绵羊ANO5... 作为Anoctamin蛋白家族的第五个成员,ANO5基因主要在绵羊肌肉再生、肌母细胞融合和肌细胞膜修复中发挥作用。为探究ANO5基因在绵羊体内的功能,本研究利用生物信息学软件分析了绵羊ANO5基因及其编码产物的结构与功能。结果显示:绵羊ANO5基因含有一个最大长度为3351 bp的开放阅读框,推测其编码1116个氨基酸残基。该基因编码蛋白的分子式为C5897H9014N1546O1668S42,分子质量为129602.32 Da,理论等电点为7.24,估计半衰期为30 h,不稳定指数为49.71,脂肪族氨基酸指数为79.43。绵羊ANO5蛋白位于质膜的可能性最大(56.5%),不含信号肽,具有8段跨膜区,属于不稳定亲水性跨膜蛋白。二级结构以无规卷曲(68.43%)为主,三级结构主要由无规卷曲缠绕折叠形成。 展开更多
关键词 绵羊 Ano5基因 生物信息学分析
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小麦烯醇化酶基因TaENO1-5B在多种环境下对株高与穗粒数的调控
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作者 张紫慧 张艳菲 +5 位作者 李龙 李超男 王景一 杨德龙 毛新国 景蕊莲 《中国农业科学》 CAS CSCD 北大核心 2024年第14期2717-2731,共15页
【目的】烯醇化酶是糖酵解过程中的关键限速酶,在植物生长发育和逆境胁迫应答中发挥重要作用。揭示小麦烯醇化酶基因TaENO1-5B的功能,开发分子标记,为通过分子育种改良小麦提供基因资源。【方法】以小麦品种旱选10号为材料克隆TaENO1-5B... 【目的】烯醇化酶是糖酵解过程中的关键限速酶,在植物生长发育和逆境胁迫应答中发挥重要作用。揭示小麦烯醇化酶基因TaENO1-5B的功能,开发分子标记,为通过分子育种改良小麦提供基因资源。【方法】以小麦品种旱选10号为材料克隆TaENO1-5B,在SMART网站分析其编码蛋白的结构域,采用Phyre2软件预测蛋白的二级和三级结构;采用实时荧光定量PCR技术分析基因在小麦不同发育时期的组织表达水平,以及在植物激素处理和逆境胁迫下的表达模式;以30份遗传多样性丰富的小麦种质为材料分析基因序列多态性,开发分子标记;以323份小麦构成的自然群体为材料进行TaENO1-5B单倍型与表型性状的关联分析,利用小麦地方品种和现代育成品种群体分析优异单倍型在我国不同麦区受育种选择的趋势。【结果】TaENO1-5B由17个外显子和16个内含子组成,编码446个氨基酸,含有保守的N端结构域和C端TIM(triose-phosphate isomerase)桶状结构域;TaENO1-5B在小麦幼苗期、拔节期、抽穗期和开花期的各个组织中均有表达,在根、根基和穗中表达量较高;TaENO1-5B启动子区含有多种顺式作用元件,包括脱落酸(ABA)、生长素(IAA)和茉莉酸甲酯(MeJA)等激素应答元件和干旱、低温胁迫相关的多种应答元件,TaENO1-5B的表达受植物激素和干旱、低温等胁迫的显著诱导;在TaENO1-5B的启动子区检测到4个SNP,基因区检测到3个SNP,组成3种单倍型Hap-5B-1、Hap-5B-2和Hap-5B-3。在干旱、高温等多种环境下,单倍型Hap-5B-2为优异单倍型,与矮秆、多小穗数和穗粒数显著相关,在我国小麦主产区的育种历史中受到了正向选择。基于TaENO1-5B启动子区SNP(2 399 bp,G/A)开发的KASP标记,与多种环境下的每穗小穗数显著相关。【结论】TaENO1-5B响应植物激素信号及非生物胁迫,在干旱、高温等多种环境下,与株高、每穗小穗数和穗粒数显著相关,Hap-5B-2是矮秆及每穗小穗数和穗粒数较多的优异单倍型。根据TaENO1-5B变异位点开发的分子标记可用于小麦株高及相关产量性状的遗传改良。 展开更多
关键词 小麦 TaEno1-5B 农艺性状 KASP标记 单倍型
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Strong field ionization of molecules on the surface of nanosystems
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作者 曲棋文 孙烽豪 +3 位作者 王佳伟 高健 李辉 吴健 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期25-34,共10页
Besides the diverse investigations on the interactions between intense laser fields and molecular systems,extensive research has been recently dedicated to exploring the response of nanosystems excited by well-tailore... Besides the diverse investigations on the interactions between intense laser fields and molecular systems,extensive research has been recently dedicated to exploring the response of nanosystems excited by well-tailored femtosecond laser fields.Due to the fact that nanostructures hold peculiar effects when illuminated by laser pulses,the underlying mechanisms and the corresponding potential applications can make significant improvements in both fundamental research and development of novel techniques.In this review,we provide a summarization of the strong field ionization occurring on the surface of nanosystems.The molecules attached to the nanoparticle surface perform as the precursor in the ionization and excitation of the whole nanosystem,the fundamental processes of which are yet to be discovered.We discuss the influence on nanoparticle constituents,geometric shapes and sizes,as well as the specific waveforms of the excitation laser fields.The intriguing characteristics observed in surface ion emission reflect how enhanced near field affects the localized ionizations and nanoplasma expansions,thereby paving the way for further precision controls on the light-and-matter interactions in the extreme spatial temporal levels. 展开更多
关键词 NAnoPARTICLE femtosecond laser field local field enhancement
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Microsphere femtosecond laser sub-50 nm structuring in far field via non-linear absorption 被引量:6
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作者 Zhenyuan Lin Kuan Liu +1 位作者 Tun Cao Minghui Hong 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第6期8-17,共10页
Creation of arbitrary features with high resolution is critically important in the fabrication of nano-optoelectronic devices.Here,sub-50 nm surface structuring is achieved directly on Sb2S3 thin films via microsphere... Creation of arbitrary features with high resolution is critically important in the fabrication of nano-optoelectronic devices.Here,sub-50 nm surface structuring is achieved directly on Sb2S3 thin films via microsphere femtosecond laser irradi-ation in far field.By varying laser fluence and scanning speed,nano-feature sizes can be flexibly tuned.Such small patterns are attributed to the co-effect of microsphere focusing,two-photons absorption,top threshold effect,and high-repetition-rate femtosecond laser-induced incubation effect.The minimum feature size can be reduced down to~30 nm(λ/26)by manipulating film thickness.The fitting analysis between the ablation width and depth predicts that the feature size can be down to~15 nm at the film thickness of~10 nm.A nano-grating is fabricated,which demonstrates desirable beam diffraction performance.This nano-scale resolution would be highly attractive for next-generation laser nano-lithography in far field and in ambient air. 展开更多
关键词 non-linear effect MICROSPHERE femtosecond laser far field
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Polycrystalline ZSM-5 Aggregates Induced by Seed and Catalytic Performance in Methanol to Hydrocarbon
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作者 WANG Xuchang JIAO Chuyu +5 位作者 JI Zhuo JIAO Qirui QIN Bo DU Yanze ZHENG Jiajun LI Ruifeng 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2024年第8期945-954,I0010-I0013,共14页
Synthesis of ZSM-5 zeolite typically utilizes small molecule polyamines or quaternary ammonium salts as organic structure guiding agent(OSDA).By contrast,the OSDA-free hydrothermal synthesis system eliminates the use ... Synthesis of ZSM-5 zeolite typically utilizes small molecule polyamines or quaternary ammonium salts as organic structure guiding agent(OSDA).By contrast,the OSDA-free hydrothermal synthesis system eliminates the use of organic templates and the subsequent calcination procedure.This not only reduces the cost of synthesis,but also prevents environmental pollution from the combustion of organic templates,representing an eco-friendly approach.Despite this,literature suggests that even so-called template-free synthesis systems often involve trace amount of organic substances like alcohol.In the present work,a calcined commercial ZSM-5 zeolite was served as seed,with sodium aluminate as aluminum source and silica sol as silicon source,ensuring an entirely template-free synthesis system.Polycrystalline ZSM-5 aggregates consisted of rod-like nanocrystals were successfully prepared in the completely OSDA-free system.Effects of the Si/Al ratio in ZSM-5 seed,dosage and crystallization conditions such as crystallization temperature and crystallization time on ZSM-5 synthesis were investigated.The results show that a highly crystallinity ZSM-5 aggregate consisting of primary nano-sized crystals less than 100 nm is produced from a gel precursor with 5.6%(in mass)seed after hydrothermal treatment for 48 h.Furthermore,the Si/Al ratio in ZSM-5 seed has little effect on the topological structure and pore structure of the synthesized samples.However,the seeds with a low Si/Al ratio facilitate faster crystallization of zeolite and enhance the acidity,especially the strong acid centers,of the catalyst.The catalytic performance of the synthesized polycrystalline ZSM-5 was evaluated during dehydration of methanol and compared with a commercial reference ZSM-5r.The results exhibit that as compared with the reference catalyst,the fabricated sample has a longer catalytic lifetime(16 h vs 8 h)attributed to its hierarchical pores derived from the loosely packed primary nanoparticles.Additionally,the prepared polycrystalline catalyst also exhibits a higher aromatics selectivity(28.1%-29.8%vs 26.5%). 展开更多
关键词 ZSM-5 polycrystalline aggregate crystal seed structure guiding agent
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基于kano模型和5R原则的越西苹果包装优化设计
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作者 宋棋超 白钊义 +1 位作者 陈迪 刘峣 《包装工程》 CAS 北大核心 2024年第16期255-262,共8页
目的运用kano模型和5R原则确定消费者对越西苹果包装的环保消费需求优先级,设计一款具有越西地域文化特色且可再利用的苹果包装。方法首先运用kano模型将消费者需求进行定量分析,然后基于环保设计5R原则制定适合越西苹果包装的创新方向... 目的运用kano模型和5R原则确定消费者对越西苹果包装的环保消费需求优先级,设计一款具有越西地域文化特色且可再利用的苹果包装。方法首先运用kano模型将消费者需求进行定量分析,然后基于环保设计5R原则制定适合越西苹果包装的创新方向定位,融入彝族刺绣的文化内涵与艺术价值,最后根据研究结果和调查分析对苹果包装进行了纸管包装与纸质板凳的复用型设计。结果借助kano模型使包装性能需求分析流程更加客观、完善,结合民族服饰实现苹果包装设计地域化的探索与实践,融入复用型设计理念,做出产品效果图。结论kano模型与5R原则结合,有效避免了单一kano模型结果获取过于主观的缺陷,有助于指导越西苹果包装复用型设计,为同类环保型农产品包装设计优化提供设计思路。 展开更多
关键词 苹果包装 KAno模型 5R原则 复用型 设计优化
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Revolutionizing plasmonic platform via magnetic field-assisted confined ultrafast laser deposition of high-density,uniform,and ultrafine nanoparticle arrays
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作者 Jin Xu Lingfeng Wang +5 位作者 Peilin Yang Haoqing Jiang Huai Zheng Licong An Xingtao Liu Gary J Cheng 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第3期428-438,共11页
The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant attention.However,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic sur... The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant attention.However,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their industrialization.To address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in air.Through precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)sensors.The profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and energyenhancement.When the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering signal.This enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)M.Notably,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of chemicals.Moreover,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS devices.Our study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy enhancement.The outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,photovoltaics,and clean water,propelling us closer to a sustainable and cleaner future. 展开更多
关键词 magnetic field manipulation laser deposition metasurface SERS
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Oxygen-vacancy-rich MnO_(x)supported RuO_(x)for efficient base-free oxidation of 5-hydroxymethylfurfural and 5-methoxymethylfurfural to 2,5-furandicarboxylic acid
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作者 Jiali Wu Weizhen Xie +7 位作者 Yining Zhang Xixian Ke Tianyuan Li Huayu Fang Yong Sun Xianhai Zeng Lu Lin Xing Tang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期670-683,I0015,共15页
2,5-Furandicarboxylic acid(FDCA)is a promising biomass-derived polymeric monomer that serves as an attractive alternative to terephthalic acid derived from fossil resources.However,the green and efficient production o... 2,5-Furandicarboxylic acid(FDCA)is a promising biomass-derived polymeric monomer that serves as an attractive alternative to terephthalic acid derived from fossil resources.However,the green and efficient production of FDCA through the oxidation of 5-hydroxymethylfurfural(HMF)and its derivatives is still rudimentary under base-free conditions.In this work,oxygen-vacancy-rich Mn Oxwas prepared and displayed a strong adsorption and anchoring ability to Ru species that mainly exposed the(210)plane of RuO_(2),bringing about highly dispersed and active interfacial Ru-O-Mn structures.Experimental results and density functional theory calculations confirm that these above features greatly facilitate the adsorption/activation of oxygen and the dehydrogenation-oxidation of HMF/5-methoxymethylfurfural(MMF),which enables an efficient FDCA production under base-free and mild conditions.Notably,a desirable FDCA yield of 86.56%was still obtained from concentrated HMF(10 wt%)under base-free conditions over oxygen-vacancy-rich Mn Oxsupported Ru Ox(1.0 MPaO_(2),120℃,6 h).This work delineates a facile catalyst preparation strategy for HMF/MMF oxidation,and might open a new avenue for the green synthesis of FDCA under base-free conditions. 展开更多
关键词 Base-free oxidation Oxygen-vacancy-rich 5-HYDROXYMETHYLFURFURAL 5-Methoxymethylfurfural 2 5-Furandicarboxylic acid
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Steering the energy sharing of electrons in nonsequential double ionization with orthogonally polarized two-color field
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作者 樊光琦 杨志杰 +4 位作者 孙烽豪 郑金梅 韩云天 黄明谦 刘情操 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期248-252,共5页
Using the semiclassical ensemble model,the dependence of relative amplitude for the recollision dynamics in nonsequential double ionization(NSDI)of neon atom driven by the orthogonally polarized two-color field(OTC)la... Using the semiclassical ensemble model,the dependence of relative amplitude for the recollision dynamics in nonsequential double ionization(NSDI)of neon atom driven by the orthogonally polarized two-color field(OTC)laser field is theoretically studied.And the dynamics in two typical collision pathways,recollision-impact-ionization(RII)and recollisionexcitation with subsequent ionization(RESI),is systematically explored.Our results reveal that the V-shaped structure in the correlated momentum distribution is mainly caused by the RII mechanism when the relative amplitude of the OTC laser field is zero,and the first ionized electrons will quickly skim through the nucleus and share few energy with the second electron.As the relative amplitude increases,the V-shaped structure gradually disappears and electrons are concentrated on the diagonal in the electron correlation spectrum,indicating that the energy sharing after electrons collision is symmetric for OTC laser fields with large relative amplitudes.Our studies show that changing the relative amplitude of the OTC laser field can efficiently control the electron–electron collisions and energy exchange efficiency in the NSDI process. 展开更多
关键词 nonsequential double ionization correlated electron–electron momentum distribution energy sharing of electrons orthogonally polarized two-color field laser field semiclassical ensemble models
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Customized modulation on plasma uniformity by non-uniform magnetic field in capacitively coupled plasma
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作者 王森 张权治 +2 位作者 马方方 Maksudbek YUSUPOV 王友年 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第6期79-87,共9页
A two-dimensional fluid model based on COMSOL Multiphysics is developed to investigate the modulation of static magnetic field on plasma homogeneity in a capacitively coupled plasma(CCP)chamber. To generate a static m... A two-dimensional fluid model based on COMSOL Multiphysics is developed to investigate the modulation of static magnetic field on plasma homogeneity in a capacitively coupled plasma(CCP)chamber. To generate a static magnetic field, direct current is applied to a circular coil located at the top of the chamber. By adjusting the magnetic field's configuration, which is done by altering the coil current and position, both the plasma uniformity and density can be significantly modulated. In the absence of the magnetic field, the plasma density exhibits an inhomogeneous distribution characterized by higher values at the plasma edge and lower values at the center. The introduction of a magnetic field generated by coils results in a significant increase in electron density near the coils. Furthermore, an increase in the sets of coils improves the uniformity of the plasma. By flexibly adjusting the positions of the coils and the applied current,a substantial enhancement in overall uniformity can be achieved. These findings demonstrate the feasibility of using this method for achieving uniform plasma densities in industrial applications. 展开更多
关键词 COMSOL capacitively coupled plasma plasma uniformity magnetic field
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Study of the Magnetocaloric Effect in La0.5Sm0.2Sr0.3Mn1-xFexO3 (x = 0 and 0.05) Manganites with the Mean-Field Theory
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作者 Amnah Alofi Salha Khadhraui 《Advances in Materials Physics and Chemistry》 CAS 2024年第7期113-122,共10页
In this paper, the magnetocaloric in La0.5Sm0.2Sr0.3Mn1-xFexO3 compounds with x = 0 (LSSMO) and x = 0.05 (LSSMFO) were simulated using mean field model theory. A strong consistency was observed between the theoretical... In this paper, the magnetocaloric in La0.5Sm0.2Sr0.3Mn1-xFexO3 compounds with x = 0 (LSSMO) and x = 0.05 (LSSMFO) were simulated using mean field model theory. A strong consistency was observed between the theoretical and experimental curves of magnetizations and magnetic entropy changes, −ΔSM(T). Based on the mean-field generated −ΔSM(T), the substantial Temperature-averaged Entropy Change (TEC) values reinforce the appropriateness of these materials for use in magnetic refrigeration technology within TEC (10) values of 1 and 0.57 J∙kg−1∙K−1under 1 T applied magnetic field. 展开更多
关键词 MANGANITES MAGNETIZATION Magnetocaloric Effect Mean field Model SIMULATION
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