检索结果-南通市图书馆

Two New Isosteroid Alkaloids from Fritillaria monatha Migo（Ⅲ）

维普期刊数据库评论

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 2006年第5期17卷 631-634页

作者： Hong Ning LIU Fei LI Yong ming LUO Wei feng zhu Jiangxi University of Traditional Chinese Medicine Nanchang 330004

Two new isosteroid alkaloids, named pengbeimine A and pengbeimine C, were isolated from the fresh bulbs of FritiUaria monatha Migo. Their structures were determined by spectral methods, and were proved by X-ray diffra... 详细信息

关键词： Fritillaria monatha Migo isosteroid alkaloids pengbeimine A pengbeimine C.

Steroidal alkaloids from the bulbs of Fritillaria monatha

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第5期19卷 544-546页

作者： Hong Ning Liu Fei Li Yong ming Luo Wei feng zhu Jiangxi University of Traditional Chinese Medicine Nanchang 330004 China

Two new Steroidal alkaloids, named pengbeisine A and pengbeisine B, were isolated from the fresh bulbs of Fritillaria monatha Migo. along with a known alkaloid. The structures were characterized as 22,26-imino-17, 23-oxido-5α-jerv-6-oxo-2α,3β-diol and 22, 26-imino-17, 23-oxido-5α-jerv-6-oxo-2β,3α-diol on the basis of spectroscopic methods.

关键词： Fritillaria monatha Migo Steroidal alkaloids Pengbeisine A Pengbeisine B

Singlet pairing gaps of neutrons and protons in hyperonic neutron stars

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第5期15卷 725-732页

作者： Yan Xu Cheng-Zhi Liu Cun-Bo Fan Xing-Wei Han Xiao-Jun Zhang ming-feng zhu Hong-Yan Wang Guang-Zhou Liu Changchun Observatory National Astronomical Observatories Chinese Academy of Sciences College of Physics Jilin University College of Physics Beihua University

The ^1 S0 nucleonic superfluids are investigated within the relativistic meanfield model and Bardeen-Cooper-Schrieffer theory in hyperonic neutron stars. The ^1 S0 pairing gaps of neutrons and protons are calculated based on the Reid soft-core interaction as the nucleon-nucleon interaction. In particular, we have studied the influence of degrees of freedom for hyperons on the ^1 S0 nucleonic pairing gap in neutron star matter. It is found that the appearance of hyperons has little impact on the baryonic density range and the size of the ^1S0 neutronic pairing gap; the ^1S0 protonic pairing gap also decreases slightly in this region where ρB = 0.0-0.393 fm^-3. However, if baryonic density becomes greater than 0.393 fm^-3, the ^1S0 protonic pairing gap obviously increases. In addition, the possible range for a protonic superfluid is obviously enlarged due to the presence of hyperons. In our results, the hyperons change the 1 So protonic pairing gap, which must change the cooling properties of neutron stars.

关键词： dense matter -- (stars) pulsars general --equation of state

Direct Urca processes involving hyperons in neutron star matter

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第3期59卷 273-278页

作者： Yan Xu Guang-Zhou Liu Cheng-Zhi Liu Cun-Bo Fan Xing-Wei Han Xiao-Jun Zhang Hong-Yan Wang ming-feng zhu Yu Meng Changchun Observatory National Astroomical ObservatoriesChinese Academy of Sciences Center for Theoretical Physics Jilin University College of Physics Beihua University College of Optical and Electronical Information Changchun University of Science and Technology

The presence of the isovector scalar interaction in neutron star matter is considered by exchangingδmeson;we study the effects ofδmesons on the direct Urca processes involving *** calculation is based on the framework of the relativistic mean field *** our analysis,the hyperon direct Urca processes under beta equilibrium are open at lower densities due toδmesons,which create a larger energy gap between two baryons in the ***δmeson leads to an obvious enhancement of the neutrino emissivity for the hyperon direct Urca *** particular,the relativistic neutrino emissivity is found to be substantially larger than predicted in the nonrelativistic approach whetherδmesons appear in an neutron star or *** our results,δmesons not only change the baryons properties,but also result in more rapid cooling rate of neutron stars by hyperon direct Urca processes.

关键词：中子星物质超子相对论平均场理论同位旋矢量相互作用非相对论中微子发射率

Current status of cerebral glioma surgery in China

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第17期124卷 2569-2577页

作者： WU Jin-song ZHANG Jie zhuANG Dong-xiao YAO Cheng-jun QIU Tian-ming LU Jun-feng zhu feng-ping MAO Ying ZHOU Liang-fu Glioma Surgery Division Department of Neurosurgery Huashan Hospital Shanghai Medical School Fudan University Shanghai 200040 China

The treatment of gliomas is highly individualized. Surgery for gliomas is essentially for histological diagnosis, to alleviate mass effect, and most importantly, to favor longer survival expectancy. During the past two decades, many surgical techniques and adjuvants have been applied to glioma surgery in China, which lead to a rapid development in the field of cerebral glioma surgery. This article broadly and critically reviewed the existing studies on cerebral glioma surgery and to portrait the current status of glioma surgery in China. A literature search was conducted covering major innovative surgical techniques and adjuvants for glioma surgery in China. The following databases were searched： the Pubmed （January 1995 to date）; China Knowledge Resource Integrated Database （January 1995 to date） and VIP Database for Chinese Technical Periodicals （January 1995 to date）. A selection criterion was established to exclude duplicates and irrelevant studies. The outcome measures were extracted from included studies. A total of 3307 articles were initially searched. After excluded by abstracts and full texts, 69 studies conducted in the mainland of China were included and went through further analysis. The philosophy of surgical strategies for cerebral gliomas in China is undergoing tremendous change. Nowadays Chinese neurosurgeons pay more attention to the postoperative neurofunctional status of the patients. The aim of the glioma surgery is not only the more extensive tumor resection but also the maximal safety of intervention. The well balance of longer overall survival and higher quality of life should be judged with respect to each individual patient.

关键词： glioma neurosurgery China

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-feng zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

环丙沙星衍生物的制备及其抗体特异性研究

现代食品科技 2017年第3期33卷 191-195,178页

作者：张明柱冯亭亭魏东河北北方学院食品安全研究中心河北张家口075000

本文研究了环丙沙星(CPLX)羧基衍生物及其抗体的制备,并对该衍生物抗体的特异性进行了测定。将环丙沙星与3-溴丙酸反应,生成环丙沙星的羧基衍生物(CPLX-COOH),通过制备液相进行纯化,用红外光谱(IR)、电喷雾电离质谱(ESI-MS)与核磁共振法... 详细信息

本文研究了环丙沙星(CPLX)羧基衍生物及其抗体的制备,并对该衍生物抗体的特异性进行了测定。将环丙沙星与3-溴丙酸反应,生成环丙沙星的羧基衍生物(CPLX-COOH),通过制备液相进行纯化,用红外光谱(IR)、电喷雾电离质谱(ESI-MS)与核磁共振法(NMR)进行鉴定;将环丙沙星衍生物分别与牛血清白蛋白(BSA)和卵清蛋白(OVA)进行偶联,分别制备免疫抗原(CPLX-COOH-BSA)和包被抗原(CPLX-COOH-OVA),并用紫外光谱法进行鉴定。用免疫抗原免疫BALB/c小鼠,制备环丙沙星衍生物多克隆抗体。通过ELISA方阵滴定法,确定包被抗原的最佳包被浓度和抗体最佳稀释度,建立了CPLX-COOH间接竞争ELISA检测方法,其半抑制浓度IC50为228.56 ng/mL,最低检出限(LOD)为25.527 ng/mL,该抗体具有广谱特异性,可与多种氟喹诺酮类药物发生交叉反应,可进行氟喹诺酮类药物残留的多元检测。

关键词：环丙沙星间隔臂衍生物抗体检测 ELISA

氧化石墨阳离子交换容量测定过程中结构的变化

在线全文

学校读者我要写书评

暂无评论

物理化学学报 2017年第2期33卷 413-418页

作者：王泉珺孙红娟彭同江冯明珠西南科技大学理学院四川绵阳621010 西南科技大学矿物材料及应用研究所四川绵阳621010 西南科技大学分析测试中心四川绵阳621010

氧化石墨(GO)结构层上的碳羟基(―C―OH)和边缘羧基(―COOH)在水介质中发生质子化反应解离出的H+具有阳离子可交换性。实验采用甲醛缩合法测量了GO的阳离子交换容量(CEC),用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱和X射线光电子能谱(... 详细信息

氧化石墨(GO)结构层上的碳羟基(―C―OH)和边缘羧基(―COOH)在水介质中发生质子化反应解离出的H+具有阳离子可交换性。实验采用甲醛缩合法测量了GO的阳离子交换容量(CEC),用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱和X射线光电子能谱(XPS)分析测试手段对GO阳离子交换过程中间产物的结构变化进行了分析。结果表明,GO的CEC高达541.48 mmol/100 g。NH_4^+和Ca^(2+)交换后的GO,保持稳定的层状结构,c轴方向层间距分别增大了0.1499和0.2905 nm。NH_4+和Ca^(2+)主要以层间可交换阳离子形式存在于层间域中,并与水分子形成可交换水化阳离子层,部分以[NH_4(H_2O)_6]+和[Ca(H_2O)_6]_2+的形式存在于结构层的边缘附近,共同平衡结构层水解产生的负电荷。

关键词：氧化石墨含氧官能团阳离子交换容量层间域结构变化

氧化程度对氧化石墨结构与阳离子交换容量的影响

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2016年第3期32卷 427-433页

作者：冯明珠彭同江孙红娟王培草西南科技大学理学院绵阳621010 西南科技大学矿物材料及应用研究所绵阳621010 西南科技大学分析测试中心绵阳621010

通过改进hummers法制备了不同氧化程度的氧化石墨。采用XRD、FTIR及XPS等对不同氧化程度氧化石墨样品的结构特征、含氧官能团种类与含量及阳离子交换容量进行表征。结果表明,石墨经氧化后结构层上键入羟基(C-OH)、环氧基(C-O-C)和羧基(-... 详细信息

通过改进hummers法制备了不同氧化程度的氧化石墨。采用XRD、FTIR及XPS等对不同氧化程度氧化石墨样品的结构特征、含氧官能团种类与含量及阳离子交换容量进行表征。结果表明,石墨经氧化后结构层上键入羟基(C-OH)、环氧基(C-O-C)和羧基(-COOH)等含氧官能团;随氧化程度的增加,石墨结构逐渐全部转化为氧化石墨结构,C-O-C和-COOH的含量逐渐增大,而C-OH的含量先增大后略有减小,阳离子交换容量也表现为先增大后减小,对应的最大值分别为1.70、3.80和4.50 mmol·g-1;氧化石墨碳平面上C-OH发生去质子化反应在层间产生H+,其他阳离子与之交换进入GO层间域,C-OH的含量是影响氧化石墨阳离子交换容量的主要因素,随C-OH含量的增加,氧化石墨样品的阳离子交换容量增大。

关键词：氧化石墨氧化程度阳离子交换容量