检索结果-南通市图书馆

Copper Metabolism and Cuproptosis:Molecular Mechanisms and Therapeutic Perspectives in Neurodegenerative Diseases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Medical Science 2024年第1期44卷 28-50页

作者： Xiao-xia BAN Hao WAN Xin-xing WAN Ya-ting tan Xi-min HU Hong-xia BAN Xin-yu CHEN Kun HUANG Qi ZHANG Kun XIONG Department of Human Anatomy and Neurobiology School of Basic Medical ScienceCentral South UniversityChangsha 430013China Department of Endocrinology Third Xiangya HospitalCentral South UniversityChangsha 430013China Department of Dermatology Xiangya HospitalCentral South UniversityChangsha 430013China Affiliated Hospital Inner Mongolia Medical UniversityHohhot 010050China Key Laboratory of Emergency and Trauma of Ministry of Education Hainan Medical UniversityHaikou 571199China Hunan Key Laboratory of Ophthalmology Changsha 430013China

Copper is an essential trace element,and plays a vital role in numerous physiological processes within the human *** normal metabolism,the human body maintains copper *** deficiency or excess can adversely affect cellular ***,copper homeostasis is stringently *** studies suggest that copper can trigger a specific form of cell death,namely,cuproptosis,which is triggered by excessive levels of intracellular *** induces the aggregation of mitochondrial lipoylated proteins,and the loss of iron-sulfur cluster *** neurodegenerative diseases,the pathogenesis and progression of neurological disorders are linked to copper *** review summarizes the advances in copper homeostasis and cuproptosis in the nervous system and neurodegenerative *** offers research perspectives that provide new insights into the targeted treatment of neurodegenerative diseases based on cuproptosis.

关键词： cuproptosis copper metabolism copper homeostasis neurodegeneration neurodegenerativedisease

老年肺癌化疗合并肺部感染致病菌分布及免疫功能指标变化

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国病原生物学杂志 2024年第8期19卷 958-962页

作者：李秋波刘瑛谭婷湖北荆门中心医院肿瘤科湖北荆门448000 湖北荆门中心医院消化内科

目的分析老年肺癌化疗合并肺部感染患者致病菌分布情况及免疫功能指标变化特点。方法选取本院肿瘤科接诊的178例老年肺癌化疗合并肺部感染(感染组)及90例未发生肺部感染患者(对照组)为本研究对象。采集呼吸系统分泌物标本进行致病菌鉴... 详细信息

目的分析老年肺癌化疗合并肺部感染患者致病菌分布情况及免疫功能指标变化特点。方法选取本院肿瘤科接诊的178例老年肺癌化疗合并肺部感染(感染组)及90例未发生肺部感染患者(对照组)为本研究对象。采集呼吸系统分泌物标本进行致病菌鉴定,对比两组患者外周血免疫球蛋白水平。对培养分离的肺炎克雷伯菌与大肠埃希进行药敏试验,同时检测耐药基因的携带情况。结果感染组检出178株致病菌,革兰阳性菌45株(占25.28%),主要为肺炎链球菌(10.11%,18/178)和金黄色葡萄球菌(5.62%,10/178);革兰阴性菌117株(占65.73%),主要为肺炎克雷伯菌(26.40%,47/178)和大肠埃希菌(19.66%,35/178);真菌16株(占8.99%),主要为白色假丝酵母菌(4.49%,8/178)和热带假丝酵母菌(2.81%,5/178)。肺部感染组患者外周血IgA、IgG、IgM水平均显著低于对照组患者(P0.05),对哌拉西林、头孢呋辛、头孢他啶、头孢曲松、头孢吡肟、头孢哌酮/舒巴坦、美罗培南、环丙沙星、莫西沙星、庆大霉素的耐药率差异有统计学意义(P<0.05)。18株产超广谱β-内酰胺酶肺炎克雷伯菌中,CTX-M基因携带率为77.78%(14/18),SHV基因携带率为44.44%(8/18),TEM基因携带率为22.22%(4/18)。7株同时携带两种及两种以上耐药基因,其中3株携带CTX-M+SHV基因,2株携带CTX-M+TEM基因,1株携带SHV+TEM基因,1株携带CTX-M+SHV+TEM基因。19株产超广谱β-内酰胺酶大肠埃希菌中,CTX-M基因携带率为78.95%(15/19),SHV基因携带率为68.42%(13/19),TEM基因携带率为57.89%(11/19)。其中,16株同时携带两种及两种以上耐药基因,其中6株携带CTX-M+SHV基因,4株携带CTX-M+TEM基因,2株携带SHV+TEM基因,4株携带CTX-M+SHV+TEM基因。结论老年肺癌化疗合并肺部感染患者致病菌主要为肺炎克雷伯菌与大肠埃希菌,外周血免疫球蛋白水平显著降低。产超广谱β-内酰胺酶肺炎克雷伯菌、产超广谱β-内酰胺酶大肠埃希菌的耐药率显著升高,两者携带的耐药基因型主要为CTX-M、SHV。

关键词：肺癌化疗肺部感染致病菌免疫功能耐药基因

Crystal Structure and Photochromism in Paint of 1,3,3-Trimethyl-6'-dihydro-indolinyl- spiro[2,3'-[3H]-naphtho[2,1-b][1,4]]oxazine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第5期26卷 572-574页

作者： tan ting-Feng Department of Materials Science ＆ Engineering Tianjin Institute of Urban Construction Tianjin 300384 China

The title compound 2 （C30H27N3O, Mr = 445.55） has been synthesized and its structure was determined by X-ray crystallography method. The crystal is of monoclinic, space group P21/c with a = 17.520（15）, b = 8.640（7）, c = 15.439（13） A, β = 98.642（14）°, V = 2310（3） 3, Dc = 1.281 g/cm^3, μ = 0.780 mm^-1, F（000） = 944, Z = 4, the final R = 0.0671 and wR = 0.1790 for 1952 observed reflections with Ⅰ 〉 2σ（Ⅰ）. X-ray analysis revealed that the interatomic distance of C（20）O（1） is 1.464（4） , longer than that of the normal C-O bond （1.41～1.43 A） in the six-membered heterocycle, but this kind of change coincides with other spiro compounds. The six-membered heterocycle containing spiro Csp3-O is nonplanar. The UV-vis spectra of the title compound in polymer films showed that it exhibits excellent photochromic property.

关键词： spirooxazine crystal structure photochromism

连续刚构桥合龙顶推力的计算与优化研究——以S248天华大桥主桥为例

在线全文

学校读者我要写书评

暂无评论

现代工程科技 2024年第12期3卷 9-12页

作者：谈亭汪学明安徽宏泰交通工程设计研究院有限公司安徽合肥230088

在混凝土收缩徐变作用下,连续刚构桥墩顶部会向跨中的顺桥向产生水平位移并在桥墩内引起附加弯矩,水平位移过大会降低桥墩稳定性,对结构受力不利。为减小这种水平位移,对连续刚构桥中跨合龙前施加水平顶推力,使墩顶预偏,从而减小桥梁运... 详细信息

在混凝土收缩徐变作用下,连续刚构桥墩顶部会向跨中的顺桥向产生水平位移并在桥墩内引起附加弯矩,水平位移过大会降低桥墩稳定性,对结构受力不利。为减小这种水平位移,对连续刚构桥中跨合龙前施加水平顶推力,使墩顶预偏,从而减小桥梁运营阶段桥墩纵向位移对桥梁产生的不利影响。以S248天华大桥主桥为例,建立有限元模型,分析计算由钢束、混凝土收缩徐变、温度等因素产生的墩顶位移,以此来计算确定中跨合龙前顶推力理论值的大小,并分析施加顶推力对成桥阶段桥墩内力的影响。施工时结合具体的合龙温度,对顶推力进行修正,为该桥合龙顶推施工提供依据,并为同类桥型结构的合龙顶推设计提供参考。

关键词：连续刚构桥合龙顶推力抗推刚度合龙温度收缩徐变墩顶水平位移

梓醇调节RIP1/RIP3/MLKL信号通路对急性心肌梗死大鼠坏死性凋亡的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国临床药理学杂志 2024年第14期40卷 2063-2067页

作者：李海莎彭慧如罗辉谭文婷李曾长沙市第一医院心功能室湖南长沙410005 长沙市第一医院心内科湖南长沙410005 长沙市第一医院传染病科湖南长沙410005

目的探究梓醇(CAT)对急性心肌梗死(AMI)大鼠坏死性凋亡的影响。方法用结扎左冠状动脉前降支的方法构建大鼠AMI模型。将60只SPF级SD雄性大鼠随机分为假手术组(Sham组)、AMI模型组(Model组)、低剂量CAT组(CAT-L组,30 mg·kg^(-1) CAT)、... 详细信息

目的探究梓醇(CAT)对急性心肌梗死(AMI)大鼠坏死性凋亡的影响。方法用结扎左冠状动脉前降支的方法构建大鼠AMI模型。将60只SPF级SD雄性大鼠随机分为假手术组(Sham组)、AMI模型组(Model组)、低剂量CAT组(CAT-L组,30 mg·kg^(-1) CAT)、高剂量CAT组(CAT-H组,60 mg·kg^(-1) CAT)和高剂量CAT+RIP1激活剂重组RIP1组[CAT-H+rRIP1组,60 mg·kg^(-1) CAT+8μg·kg^(-1)重组大鼠受体相互作用蛋白激酶-1(rRIP1)],每组12只。CAT采取灌胃给药,每日1次,共给药4周。rRIP1采取尾静脉注射,隔天给药,共4周。Sham组、Model组分别灌胃和尾静脉注射等量的0.9%NaCl。CAT-L组、CAT-H组灌胃的同时需隔天尾静脉注射0.9%NaCl。TUNEL染色法观察大鼠心肌细胞凋亡情况。蛋白质印迹法检测大鼠心肌组织RIP1/RIP3/MLKL信号通路相关蛋白的表达。结果Sham组、Model组、CAT-H组和CAT-H+rRIP1组大鼠的心肌细胞凋亡率分别为(4.23±0.63)%、(33.48±3.94)%、(13.50±1.86)%和(29.62±3.08)%,心肌组织RIP1蛋白相对表达水平分别为0.21±0.02、0.86±0.09、0.43±0.04和0.72±0.07,RIP3蛋白相对表达水平分别为0.30±0.03、0.94±0.09、0.49±0.05和0.83±0.08,MLKL蛋白磷酸化水平分别为0.35±0.04、1.13±0.11、0.64±0.06和0.97±0.10。Model组上述指标与Sham组比较,CAT-H组的上述指标与Model组和CAT-H+rRIP1组比较,在统计学上差异均有统计学意义(均P<0.05)。结论CAT可能通过下调RIP1/RIP3/MLKL信号通路抑制AMI大鼠心肌细胞的坏死性凋亡。

关键词：梓醇受体相互作用蛋白激酶-1/受体相互作用蛋白激酶-3/混合谱系激酶结构域样蛋白信号通路急性心肌梗死坏死性凋亡

Annealing Effects on Structural,Optical Properties and Laser-Induced Damage Threshold of MgF2 Thin Films

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第1期30卷 73-78页

作者： ting-ting tan Bang-Jie Liu Zhi-Hui Wu Zheng-tang Liu State Key Lab of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

The chemical structures, optical properties and laser-induced damage thresholds of magnesium fluoride films annealed at different temperatures were investigated. The results showed that the stoichiometry of MgF2 film changed a little with the increase in annealing temperature. Analysis of the optical properties indicated that excellent antireflection behavior of the film in the range of 200-400 nm can be obtained by the samples coated with MgF2 film. The refractive index increased and the extinction coefficient decreased with increasing annealing temperature. Compared with the asdeposited films, the laser-induced damage threshold was improved after annealing process and decreased with the increase in annealing temperature, which was probably due to the denser film and more absorption centers under higher annealing temperature.

关键词： Annealing temperature Chemical structure Optical properties Laser-induced damage threshold (LIDT) MgF2 films

Bipolar Resistive Switching Characteristics of TiN/HfO_(x)/ITO Devices for Resistive Random Access Memory Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第10期30卷 152-155页

作者： tan ting-ting CHEN Xi GUO ting-ting LIU Zheng-tang State Key Lab of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072

Resistive switching characteristics of hafnium oxide are studied for possible nonvolatile memory device *** HfOx films with different oxygen contents are deposited by rf magnetron sputtering under different O_(2) flow *** films are amorphous,and the stoichiometric of the film is improved by increasing the O_(2) flow ***-voltage characteristics of the TiN/HfOx/ITO device are investigated with 1 mA *** bipolar resistive switching behavior is observed for the TiN/HfOx/ITO structure,and the resistive switching mechanism of the TiN/HfOx/ITO structure is explained by trap-controlled space charge limit current conduction.

关键词： structure conduction amorphous

DES-Fe3O4 composite for rapid extraction of residual plant growth regulators in edible vegetable oil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第6期30卷 1182-1185页

作者： ting tan Xiaomei Xu Yiqun Wan State Key Laboratory of Food Science and Technology Nanchang University Nanchang 330047 China Center of Analysis and Testing Nanchang University Nanchang 330031 China School of Chemistry Nanchang University Nanchang 330031 China

A rapid DES-Fe3O4 microextraction coupled with liquid chromatography method was ingeniously developed for simultaneous control of five typical plant growth regulators in a planting cycle including indole-3-acetic acid, abscisic acid, thidiazuron, 1-naphthylacetic acid and forchlorfenuron. The experiments were carried out with one type of carboxylic acid-assisted deep eutectic solvent (nChCl:nacetic acid=1:3) as extractant, coupled with ultrasonic wave extraction for 30 min at bath temperature at 50 ℃. Under the optimum conditions, good extraction performances of linearities for five plant growth regulators were achieved separately in the range of 0.10–50 mg/L of indole-3-acetic acid, 0.06–50 mg/L of abscisic acid, 0.20–50 mg/L of thidiazuron, 0.50–50 mg/L of 1-naphthylacetic acid and 0.06–50 mg/L of forchlorfenuron and recoveries were ranged from 70.4%to 102.2%. Meanwhile, Fe3O4 was preferentially combined with DES in the oil matrix, the advantage of which was pointed to rapid and efficient separation of targeted plant growth regulators from complicated oil matrix. The proposed approach achieved satisfied results and met the monitoring requirements of plant growth regulators control in edible vegetable oil samples.

关键词： DES-Fe3O4 composite Deep eutectic solvent Rapid separation Plant growth regulators Edible vegetable oil

在线全文

学校读者我要写书评

暂无评论

牦牛乳蛋白多态性对奶酪凝乳特性的影响

食品与生物技术学报 2024年第6期43卷 40-49页

作者：谈婷罗毅皓孙万成孙祥祥青海大学农牧学院青海西宁810016

为了检测青海部分地区7家不同牧场牦牛乳κ-酪蛋白和αs1-酪蛋白基因多态性,作者分析了基因多态性对奶酪凝乳特性的影响。通过提取牦牛乳体细胞,采用限制性片段长度多态性聚合酶链式反应(polymerase chain reaction-restrition fragment... 详细信息

为了检测青海部分地区7家不同牧场牦牛乳κ-酪蛋白和αs1-酪蛋白基因多态性,作者分析了基因多态性对奶酪凝乳特性的影响。通过提取牦牛乳体细胞,采用限制性片段长度多态性聚合酶链式反应(polymerase chain reaction-restrition fragment length polymophism,PCR-RFLP)分析技术,对提取的DNA进行PCR扩增及酶切,对电泳条带进行基因分型;提取牦牛乳蛋白,采用高效液相色谱法(high performance liquid chromatography,HPLC)分析各样品与标准品色谱图,对出峰时间和出峰形状进行基因分型。利用流变仪测定不同基因型牦牛乳凝乳过程中流变特性,记录奶酪凝乳时间,计算奶酪得率。牦牛乳κ-酪蛋白基因有AA型、AB型和BB型3种基因型,3种基因型与凝乳特性的分析表明,在凝乳时间方面A等位基因为有利等位基因。牦牛乳αs1-酪蛋白存在AA型、AB型和BB型3种类型,3种基因型与凝乳特性的分析表明,在凝乳时间、奶酪得率、最大动力黏度和最大剪切速率方面B等位基因为有利等位基因。以上结果表明,青海7家牧场牦牛乳κ-酪蛋白和αs1-酪蛋白均存在基因多态性,κ-酪蛋白A等位基因和αs1-酪蛋白B等位基因是影响牦牛乳凝乳特性的主效基因。

关键词：牦牛乳蛋白质多态性高效液相色谱法限制性片段长度多态性聚合酶链式反应凝乳特性