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胸腺嘧啶

胸腺嘧啶的相关文献在1988年到2022年内共计241篇,主要集中在化学、药学、生物化学 等领域,其中期刊论文134篇、会议论文12篇、专利文献13095篇;相关期刊105种,包括药物分析杂志、中国海洋药物、广东工业大学学报等; 相关会议12种,包括中国质谱学会第32届年会、2012年全国农学博士后学术论坛、2012年两岸三地高分子液晶态与超分子有序结构学术会议暨第十二届全国高分子液晶态与超分子有序结构学术论文报告等;胸腺嘧啶的相关文献由666位作者贡献,包括A·R·海格特、C·J·马林、D·A·贝特本纳等。

胸腺嘧啶—发文量

期刊论文>

论文:134 占比:1.01%

会议论文>

论文:12 占比:0.09%

专利文献>

论文:13095 占比:98.90%

总计:13241篇

胸腺嘧啶—发文趋势图

胸腺嘧啶

-研究学者

  • A·R·海格特
  • C·J·马林
  • D·A·贝特本纳
  • D·K·赫琴森
  • D·M·巴恩斯
  • D·刘
  • G·G·Z·张
  • J·E·亨格维尔德
  • J·K·普拉特
  • J·T·兰多尔夫
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 陈修智; 岑首溪; 薛荣荣; 陈风华
    • 摘要: 氟尿嘧啶(FU)和胸腺嘧啶(T)可以形成两种固溶体,分别是富含FU且结构与FU晶型Ⅲ相似的固溶体Ⅰ和富含T且结构与T晶型C相似的固溶体Ⅱ。本工作利用球磨法制备出了这两种固溶体。通过系统的球磨实验,利用Vegard定律建立了FU-T固溶体的组分含量和其晶格常数之间的线性关系,发现形成固溶体Ⅰ所需的氟尿嘧啶摩尔分数(xFU)的最小值约为1/2,而形成固溶体Ⅱ所需的xFU的最大值约为1/3。
    • 张树萌; 李锦莲; 郭晓玲; 孟令仁; 周实
    • 摘要: 用基于氧化石墨烯量子点/多壁碳纳米管/丝网印刷电极(GOQDs/MWCNTs/SPCE*)的电化学检测方法同时检测小鼠胚胎成纤维(BALB/c 3 T3)细胞中的胸腺嘧啶和胞嘧啶,并考察富集电位、富集时间、pH值对胸腺嘧啶和胞嘧啶标准品电化学行为的影响.实验结果表明:最佳检测条件为富集电位0,富集时间150 s,pH=7.4;电极对胸腺嘧啶和胞嘧啶的最低检测限分别为0.69,0.95μmol/L;该方法可同时灵敏检测BALB/c 3T3细胞中的胸腺嘧啶和胞嘧啶.
    • 汪倩; 宋超; 刘照关; 裘丽萍; 吴伟; 胡庚东; 孟顺龙; 陈家长
    • 摘要: 为了在水环境治理领域,研究开发出高效、实用的汞分离去除新材料,实验合成了一种新型胸腺嘧啶偶联羧基化磁性微球,并考察了其对水体环境中的汞进行吸附和去除效果的分析.结果表明:经过对此新型材料粒径、用量以及不同汞浓度吸附去除效果的优化实验,发现粒径为1.0μm的磁珠材料,在用量为5.0μL/mL时,处理水溶液中汞浓度高达10.0μg/L的样品时,具有较好的吸附效果,去除率可达89.0%.
    • 摘要: 科技热词DNA存储近日,东南大学研究团队将校训成功写入DNA中,实现了DNA合成与测序环节的一体化,仪器设备也实现了小型化。当前主流的DNA存储技术是以人工合成的脱氧核糖核酸(DNA)分子为存储介质,将数字信息存储于DNA分子上。DNA是由腺嘌呤(A)、胸腺嘧啶(T)、胞嘧啶(C)和鸟嘌呤(G)4个碱基构成双螺旋结构,来保存生物体的遗传信息。而在数字世界,数据信息都会转换为二进制数据即“0”和“1”的状态来进行存储。
    • 科技日报
    • 摘要: 日本大阪大学的研究小组首次直接观察到了进入癌细胞DNA中的抗癌药物作用情况。科学家们曾推测抗癌药物是通过取代DNA中的胸腺嘧啶来抑制癌细胞繁殖,从而发挥抗肿瘤效果,但一直未能直接观察到进入DNA中的抗癌药物。
    • 张晓杰; 方斌; 袁双龙
    • 摘要: 在次亚磷酸钠-硫酸铜溶液的反应体系中加入小分子型诱导剂,制备了高径厚比的铜纳米片,并将其分散于丙烯酸/环氧复合树脂中制成导电胶.通过X射线衍射(XRD)、扫描电子显微镜(SEM)表征铜纳米片的结构与形貌,采用电阻测试仪测定导电胶的导电性能,研究了诱导剂种类及浓度、反应体系的pH值对铜纳米片形貌的影响,并分析了铜纳米片的形成过程.结果表明:诱导剂胸腺嘧啶的加入及合适的pH是制备铜纳米片的关键;胸腺嘧啶的浓度及pH过低或过高时,均会导致产物中片状铜粉比例减少,颗粒状铜粉比例增加.获得高质量的铜纳米片的最佳条件为:胸腺嘧啶的浓度1.5 mmol/L,pH 1.5,反应时间2h.此条件下所得的铜纳米片表面平整,厚度为50~100 nm,直径约为15 μm,以此铜纳米片制得的导电胶比球磨法片状铜粉制成的导电胶有着更好的导电性.
    • 黄永兰; 姜献东; 沈仁杰; 李武松; 康爱红
    • 摘要: 在制革、冶金、电镀、采矿等行业发展过程中,含有重金属离子的废水进入河道和农田,重金属污染越来越受到人们的重视,治理和回收重金属也成为一个亟待解决的难题.其中重金属离子Hg2+被认为是最毒的重金属.为了有效处理含重金属离子Hg2+的废水,将胸腺嘧啶(Thymine)修饰到第五代聚酰胺-胺树状大分子(G5.NH2)表面,得到G5-T,之后将G5-T与聚乳酸羟基乙酸(PLGA)混合并用静电纺丝方法得到PLGA/G5-T混纺纤维,并用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)等手段对PLGA/G5-T混纺纤维进行了表征,并以电感耦合等离子体发射光谱仪ICP-OES为检测手段,研究PLGA/G5-T对Hg2+的吸附效果.FTIR结果表明,PLGA/G5-T纤维中3 320 cm-1处的氨基吸收峰比PLGA/G5上的弱,在1660 cm-1处的酰胺基吸收峰比PLGA/G5强,说明G5.NH2与胸腺嘧啶-1-乙酸成功反应.SEM结果表明,添加了G5-T混纺而得的PLGA/G5-T平均直径为(751±72) nm,纤维形貌均一,表面光滑无粘连,说明G5-T的加入没有破坏纤维的完整性.ICP-OES研究发现,PLGA/G5-T纤维膜对Hg2+的脱除效率明显高于PLGA/G5纤维膜, 胸腺嘧啶显著增强了PLGA/G5-T纤维膜对Hg2+的脱除效率; 对多种金属离子的吸附实验结果显示,PLGA/G5-T纤维膜对Cu2+,Cd2+和Co2+有微弱的吸附效果,但其对Hg2+吸附效果显著,PLGA/G5-T纤维膜对水溶液中的Hg2+有选择性吸收功能。研究为开发新型Hg2+吸附剂提供了一种新方法.%In the development process of leather industry ,metallurgical industry ,electroplating industry ,mining industry and other industries ,wastewater containing heavy metal ions is discharged to the river and farmland ,resulting in environmental pol-lution .Heavy metal pollution has been paid more and more attention .It is an urgent problem to control the pollution and recover heavy metals .Hg2+ is considered to be the most toxic heavy metal .This article studied the modified PLGA/G5-T fibers to treat the Hg2+ wastewater efficiently .In this study ,thymine-1-acetic containing carboxyl reacted with G5 .NH2 to form G5-T .Then G5-T was mixed with PLGA for subsequent formation of T-modified electrospun PLGA/G5-T nanofibers .The nanofibers were characterized with fourier transform infrared (FTIR) and scanning electron microscope (SEM ) ,and measured the sorption effi-ciency and selectivity by inductively coupled plasma-optical emission spectroscopy (ICP-OES) .FTIR results showed that the amino groups absorption peak of PLGA/G5-T nanofibers at 3 320 cm-1was weaker than that of PLGA/G5 ,the amide groups absorption peak of PLGA/G5-T nanofibers at 1660 cm -1was stronger than that of PLGA/G5 ,suggesting that G5 .NH2 reacted with thymine-1-acetic successfully .The results from SEM measurements showed that mean diameter of PLGA /G5-T nanofibers was (751± 72) nm ,and fiber morphology of PLGA/G5-T was uniform ,smooth without adhesion .It was concluded that the thymine modification would not appreciably impact the fibrous morphology of PLGA/G5-T nanofibers when compared with the PLGA/G5 nanofibers .It could be found with ICP-OES that Hg2+ removal efficiency of PLGA/G5-T was significantly higher than that of PLGA/G5 fiber membrane .The good performance on Hg2+ removal was due to the enhanced removal efficiency of thymine;absorbing test of various metal ions showed that only a little ion of Cu2+ ,Cd2+ and Co2+ was adsorbed on PLGA/G5-T while a lot of Hg2+ ions were adsorbed .It was proven that PLGA/G5-T nanofibers can remove Hg2+ from aqueous solution selectively and efficiently .This study is beneficial to research and development of new Hg2+ adsorbents .
    • 马蔷; 王玉贤; 张卓勇; 王果; 相玉红
    • 摘要: 利用太赫兹时域光谱技术对胸腺嘧啶、尿素及其水溶液旋蒸产物与固态研磨产物进行表征分析.结果表明,胸腺嘧啶和尿素在两种环境下作用后的产物均在0.75、0.94 THz处出现明显区别于原料物质的吸收峰.采用密度泛函理论对胸腺嘧啶和尿素共晶体的5种可能结构模型进行了优化和光谱模拟,结果显示其中的共晶体结构E在0.76、0.98 THz处存在特征吸收峰,与实验吸收峰位置基本吻合.由此判断,胸腺嘧啶与尿素在水溶液与固态研磨条件下均可以通过氢键形成物相结构一致的共晶体.该结果表明太赫兹光谱技术可以有效地鉴别和分析胸腺嘧啶、尿素及其共晶体.结合理论模拟结果对胸腺嘧啶与尿素的共晶体吸收峰对应的相关振动模式进行了归属.%Terahertz time-domain spectroscopy technology was utilized for the characterization and analysis of thymine,urea and their co-crystal products yielded from cogrinding and solution.Experimental results showed that similar absorption peaks of co-crystal products from cogrinding and solution,which were formed by thymine and urea at 0.75,0.94 THz,could be observed,indicating that they were the same materials.The position and intensity of absorption peaks for such products were significantly different from their corresponding original materials.The optimized geometries and vibrational spectra of five feasible theoretical molecular structures of the thymine-urea co-crystal were performed with the density functional theory (DFT) calculation,and the theoretical results showed that absorption peaks at 0.76,0.98 THz occurred in structure E,which was much in agreement with the THz experimental result.A comparison of the experimental and theoretical results confirmed that a co-crystal configuration linked by a pair of hydrogen bonds between thymine and urea was formed.This work can provide experimental and theoretical benchmarks to the detection and analysis of hydrogen bonding interaction and molecular structure of thymine-urea co-crystal with the newly developed terahertz spectroscopic technology.The vibrational modes of the thymine-urea co-crystal were also assigned with the help of the simulated DFT results.
    • 李勇; 周留柱; 孔祥和
    • 摘要: 根据量子化学理论,应用Gaussian09W程序中密度泛函理论(DFT)B3LYP方法,在6-311++G(d,p)基组水平上,研究了胸腺嘧啶与水分子团簇C5H6N2O2·(H2O)n(n=1~4)分子团簇的基态结构以及红外光谱.通过对C5H6N2O2·(H2O)n(n=1~4)分子团簇的结构优化,获得了团簇最稳定的结构.AIM程序分析表明:分子团簇间形成了氢键,而且电子密度ρ的强弱也反映了红移和蓝移的大小.之后使用Veda4软件对C5H6N2O2·(H2O)n(n=1~4)分子团簇红外光谱的振动频率进行了分析,并对振动频率进行了比较.最后,分析四种最稳定结构的分子团簇的红外光谱表明O-H…O和N-H…O氢键的形成使得O-H和N-H之间伸缩频率减小,发生了红移;O-H…N氢键使O-H之间的弯曲振动频率变大,发生了蓝移.%The ground state structure and infrared spectra of the C5H6N2O2·(H2O)n (n=1~4) clusters are calculated by density functional theory ( DFT ) at the B3 LYP complex function in Gaussian09 W. The stable structures of C5H6N2O2·(H2O)n clusters can be obtained by optimizing its structure. AIM program analysis shows that the formation of hydrogen bonds between clusters, and the intensity of electron density also reflects the size of the red-shifted and blue-shifted. The vibrational infrared spectrum of C5H6N2O2. (H2O)n (n=1~4) clusters is analyzed by using the Veda4 and also compared the vibration frequency. The infrared spectra of the four most stable clusters molecules shows the formation of O-H…O or N-H…O H-bond makes the vibration frequency between O-H or N-H decrease and lead the vibration frequency red-shifted, while O-H…N H-bond makes the vibration frequency between O-H increase and lead the vibration frequency blue-shifted.
    • 蒋才建; 刘清安; 杨利民; 卢进利
    • 摘要: Objective]To discuss the expressions of thymidine phosphorylase (TP),dihydropyrimidine dehydrogenase (DPD)in colorectal cancer and its correlative effects with XELOW chemotherapy.[Methods]The expressions of TP and DPD in carcinoma tissues of 58 cases were detected by double antibody sandwich of ELISA,the medians of the expressions of TP and DPD were acted as dividing lines,and the patients were di-vided into high expression group and low expression group,two groups of patients were treated with XELOX chemotherapy program after surgery.After four courses of therapy,the early efficacy of different TP and DPD expression levels in patients was compared.All patients were followed up for 12~36 months,Kaplan-Meier survival analysis was conducted.The prognostic survival of patients with different TP and DPD expression lev-els were compared.[Results]Short-term clinical efficacy of TP high expression group and low expression group after XELOX chemotherapy had no significant difference (P >0.05).The median survival time of TP high expression group was significantly higher than that of low expression group (P 0.05).[Conclusion]The expression level of TP and DPD in colorectal cancer is related to the clinical efficacy of XELOX chemotherapy,and it can be used as one of the important indicators to predict the efficacy of XELOX chemotherapy.%【目的】探讨胸腺嘧啶磷酸化酶(TP)、二氢吡啶脱氢酶(DPD)在结直肠癌组织中的表达情况及其与 XELOX化疗效果的相关性。【方法】用 ELISA 双抗体夹心法检测58例结直肠癌患者癌组织中 TP 和DPD的表达量,以 TP 和 DPD的中位数为分界,将患者分为高表达组和低表达组,患者术后均接受 XELOX方案进行化疗,4个疗程后,比较不同TP和DPD的表达水平患者的早期疗效。对所有患者进行随访12~36个月,行Kaplan-Meier生存分析,比较比较不同TP和DPD的表达水平患者的预后生存情况。【结果】TP 高表达组和低表达组行 XELOX化疗方案的短期临床疗效相比差异无显著性(P >0.05);TP 高表达组中位生存时间显著高于低表达组(P 0.05)。【结论】结直肠癌组织TP、DPD表达水平对XELOX化疗方案的临床疗效有关,可以作为预测XELOX化疗方案疗效的重要指标之一。
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