排序方式: 共有155条查询结果,搜索用时 31 毫秒
1.
荧光光度法直接测定高纯氧化钕中的痕量镨和铈 总被引:2,自引:0,他引:2
李义久 《理化检验(化学分册)》1998,34(5):198-199,201
使用P-ELS50荧光光谱仪,在盐酸介质中,用同一激发波长激发,分别测定Pr(Ⅲ)(nm)和Ce(Ⅲ)(356nm)发射峰强度。 相似文献
2.
非水介质毛细管电泳电导检测舒血宁片中槲皮素含量 总被引:6,自引:0,他引:6
以甲醇:水=70:30的体系为分离介质,柠檬酸-三(羟甲基)氨基甲烷(Citric acid-Tris)为支持电解质,使用电导检测,对槲皮素及其制剂舒血宁片进行了毛细管电泳分离检测,对电泳介质的种类、浓度、表观pH值以及操作电压和进样时间对分离的影响进行了研讨,并对分离检测机理进行了探讨。建立的测定槲皮素的方法的线性范围为:8.0-160.0mg/L;峰面积的RSD(n=6)为1.7%,检出限为1.0mg/L;样品加标回收率为92.8%-98.2%。 相似文献
3.
4.
Yanpeng Xue Eirini Maria Paschalidou Paola Rizzi Livio Battezzati Hans-Jörg Fecht 《哲学杂志》2018,98(30):2769-2781
Nanoporous gold thin films have been fabricated through chemical de-alloying of Au-based nanoglass with a nanocolumnar structure, with composition Au40Cu28Ag7Pd5Si20 (at.%), that had previously been deposited by magnetron sputtering. By varying the de-alloying conditions, gold ligaments ranging from 20 to 100?nm were obtained. The microstructure and chemical composition of the as-prepared films were characterised by various techniques. Surface-enhanced Raman scattering (SERS) of thin films was investigated using rhodamine 6G. The results indicate that the main microstructural features with interconnected ligaments and defects of nanoporous gold result in significant SERS enhancement. 相似文献
5.
Jing Wu Ying Qu Kun Shi Bingyang Chu Yanpeng Jia Xue Xiao Qianjun He Zhiyong Qian 《中国化学快报》2018,29(12):1819-1823
The CPT was loaded into the HMSNs with the high loading capacity. Then the CPT@HMSNs were loaded into the PLEL thermosensitive hydrogels for local therapy to prevent the recurrence of breast cancer after the tumor was resected. 相似文献
6.
Experimental and numerical simulations were undertaken to estimate the effects of imperfect conditions on stress waves in split Hopkinson pressure bar(SHPB)experiments. The photonic Doppler velocimetry(PDV) measurement results show that the rise and fall times of an incident wave increases with an increasing inclination angle;also, the fluctuations of the incident wave disappear gradually with the increase of inclination angle. The following characteristics for various defects in the SHPB were obtained by numerical simulation:(1) the influence of a curved bar was negligible;(2) misalignment modestly affects the fluctuation characteristics, and bending waves were generated at this condition;(3) inclination and indentation of the impact endsurface had a great impact on the incident waves, and both of them increase the rise time of the incident wave by increasing the degree of defects. In view of the results, misalignment,inclination, and indentation in SHPB experiments should be minimized. 相似文献
7.
Yiqi Zhang Zhenkun Wu Milivoj R. Beli Huaibin Zheng Zhiguo Wang Min Xiao Yanpeng Zhang 《Laser \u0026amp; Photonics Reviews》2015,9(3):331-338
The feasibility of realizing a photonic Floquet topological insulator (PFTI) in an atomic ensemble is demonstrated. The interference of three coupling fields will split energy levels periodically, to form a periodic refractive index structure with honeycomb profile that can be adjusted by different frequency detunings and intensities of the coupling fields. This in turn will affect the appearance of Dirac cones in momentum space. When the honeycomb lattice sites are helically ordered along the propagation direction, gaps open at Dirac points, and one obtains a PFTI in an atomic vapor. An obliquely incident beam will be able to move along the zigzag edge of the lattice without scattering energy into the PFTI, due to the confinement of edge states. The appearance of Dirac cones and the formation of a photonic Floquet topological insulator can be shut down by the third‐order nonlinear susceptibility and opened up by the fifth‐order one.
8.
WU Liting XIN Yujia GUO Zhaoyang GAO Wei ZHU Yanpeng br WANG Yinsong RAN Ruixue YANG Xiaoying 《高等学校化学研究》2022,38(2):562-571
Combining photothermal therapy and radiotherapy(PTT-RT) with reducing tumor hypoxia acts as an important antitumor modality. However, it is a great challenge to realize photothermal therapy, radiotherapy and exogenous oxygen supply in one nanosystem. To realize a combination of the three functions, we fabricated a red blood cell membrane(RBCm)-camouflaged, red blood cell content(RBCc) and the copper sulfide(CuS) co-loaded dendritic large pore mesoporous silica nanoparticle(DLMSN/CuS/RBCc/ RBCm). The cell membrane coating endowed the nanoparticles with good stability in the physiological environment, and CuS allowed the nanoparticle exhibiting good photothermal and radiosensitization properties. RBCc loaded nanoparticle DLMSN/CuS/RBCc enhanced superior anti-tumor effect than DLMSN/CuS during combined PTT-RT therapy because the introduction of RBCc increased the exogenous oxygen supply. The in vitro study further demonstrated that the combination of photothermal therapy and radiotherapy induced superior antitumor efficacy than single therapy. Our work thus presents a unique multifunctional nanoscale platform favorable for combined PTT and RT. 相似文献
9.
In this work, we synthesised and characterised three novel fluorescence macrocyclic sensors containing optically active dansyl groups. The studies for the interaction of the synthesised compounds with various mental ions (Li+, Na+, K+, Ag+, Mg2+, Ca2+, Ba2+, Pb2+, Zn2+, Co2+, Cd2+, Hg2+, Ni2+, Cu2+, Mn2+, Cr3+, Al3+, Fe3+) were performed by fluorescence titration, Job’s plot, ESI-MS and DFT calculations. The results showed that the sensors 1a–1c displayed selective recognition for Cu2+ and Fe3+ ions and formed stoichiometry 1:1 complex through PET mechanism in DMSO/H2O solution (1:1, v/v, pH 7.4 of HEPES). The binding constant (K) and detection limit were calculated. 相似文献
10.
Wyche TP Hou Y Braun D Cohen HC Xiong MP Bugni TS 《The Journal of organic chemistry》2011,76(16):6542-6547
A marine Verrucosispora sp. isolated from the sponge Chondrilla caribensis f. caribensis was found to produce thiocoraline, a potent cytotoxic compound. Five new analogs of thiocoraline were isolated and represent the first analogs of thiocoraline. 22'-Deoxythiocoraline (2), thiochondrilline C (5), and 12'-sulfoxythiocoraline (6) demonstrated significant cytotoxicity against the A549 human cancer cell line with EC(50) values of 0.13, 2.86, and 1.26 μM, respectively. The analogs provide insight into the SAR and biosynthesis of thiocoraline. The DP4 probability method was used to analyze ab initio NMR calculations to confirm stereochemical assignments. 相似文献