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国家重点基础研究发展计划(2006CB921105)

作品数:10 被引量:19H指数:3
相关作者:孙真荣贾天卿蔡炜颖邓莉冯东海更多>>
相关机构:华东师范大学同济大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金国家教育部博士点基金更多>>
相关领域:理学机械工程生物学医药卫生更多>>

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10 条 记 录,以下是 1-10
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拉曼光谱研究复方鹿仙草颗粒对SMMC-7721肝癌细胞的作用被引量:5
2008年
应用拉曼光谱研究了不同浓度的鹿仙草溶液与肝癌细胞SMMC-7721的相互作用,通过对药物作用前后细胞的光谱变化进行分析,从而为阐明鹿仙草与肝癌细胞的作用方式提供重要的依据。拉曼光谱显示,加入鹿仙草后,细胞的许多峰都发生了变化。归属于磷酸骨架振动的785和1 092 cm-1的两个峰强度下降,对应碱基A和G的峰1 312和1 585 cm-1等也有不同程度的降低,表明鹿仙草可能插入DNA碱基对之间,使DNA复制受到抑制,导致细胞DNA含量下降,而且会引起DNA单、双链的断裂。同时,研究还发现属于蛋白质的振动峰(1 005,1 360,1 656 cm-1)强度也有不同程度下降,说明蛋白质二级结构以及侧链氨基酸的环境均发生了改变。此外,鹿仙草对细胞的作用效果随浓度增加逐步增强。
张金彦郭建宇蔡炜颖孙真荣
关键词:拉曼光谱鹿仙草肝癌细胞
Selective excitation and suppression of coherent anti-Stokes Raman scattering by shaping femtosecond pulses被引量:1
2010年
Femtosecond coherent anti-Stokes Raman scattering (CARS) suffers from poor selectivity between neighbouring Raman levels due to the large bandwidth of the femtosecond pulses. This paper provides a new method to realize the selective excitation and suppression of femtosecond CARS by manipulating both the probe and pump (or Stokes) spectra. These theoretical results indicate that the CARS signals between neighbouring Raman levels are differentiated from their indistinguishable femtosecond CARS spectra by tailoring the probe spectrum, and then their selective excitation and suppression can be realized by supplementally manipulating the pump (or Stokes) spectrum with the π spectral phase step.
张诗按张晖王祖赓孙真荣
Optical limiting of niobic tellurite glass induced by self-trapped exciton absorption of the AgCl nanocrystal dopant
2009年
Niobic tellurite glass doped by silver chloride nanocrystal was prepared with the melting-quenching and heat treatment method, and the self-trapped exciton absorption band of the silver chloride nanocrystal was observed at 532 nm in the UV-visible absorption spectrum. The glass structure characteristics were investigated by Raman spectroscopy, and the mechanism of self-trapped exciton was analyzed by Jahn-Teller model. Its optical limiting was measured with 532 nm picosecond laser pulses, and the corresponding nonlinear absorption coefficient was measured with open-aperture Z-scan. The experimental results showed that optical limiting at 532 nm was attributed to free carrier absorption between the self-trapped state and the continuum band.
ZHAO zhenYuLIN JianJIA TianQinSUN ZhenRongWANG ZuGeng
关键词:碲酸盐玻璃光限幅紫外可见吸收光谱
Dependence of surface-enhanced Raman scattering from Calf thymus DNA on anions被引量:4
2008年
Dependence of surface-enhanced Raman scattering (SERS) from Calf thymus DNA on anions is investigated. With the silver colloid, the bands at 732, 960 and 1333 cm^-1 for adenine (A), 1466 cm^-1 for deoxyribose, and 1652 cm^-1 for the C=O group of thymine (T) are observably enhanced. With the presence of the Cl^- or SO4^2- anions, the bands at 732 and 1326/1329 cm^-1 for the symmetric stretching and skeletal vibrational modes of adenine (A) are dramatically enhanced, and the enhancement effect with the SO4^2- ion is more than that with the Cl^- ion. The experimental results show that the DNA molecule can be adsorbed on the silver colloid particles through the C6N and N7 of adenine (A) the C=O of thymine (T) and deoxyribose. Moreover, the formed hydrogen bonding of the Cl^- or SO4^2- ions to the C6NH2 group of adenine (A) can induce larger C6N electronegativity, which is favor for the C6N/N7 cooperative adsorption on the (Ag)^+ colloid particles.
朱纪春张延会吴良平王祖赓孙真荣
关键词:COLLOIDSDNAGENESSILVER
三光束飞秒激光干涉在GaP,ZnSe表面诱导二维复合纳米-微米周期结构被引量:5
2010年
报道了三光束飞秒激光干涉在GaP和ZnSe晶体表面诱导二维复合纳米-微米周期结构.改变三束光的偏振组合方式,可以得到不同的纳米-微米复合结构.理论计算了相应偏振条件下光场强度分布、椭偏度分布和偏振方向分布.实验和理论计算结果表明,烧蚀斑上的微米长周期结构是由三光束干涉的强度花样决定,短周期纳米结构是由光场的偏振干涉花样决定.这些研究在纳米材料制备、超高密度光存储以及材料特性周期性调制等方面有很大的应用前景.
熊平新贾鑫贾天卿邓莉冯东海孙真荣徐至展
关键词:飞秒激光多光束干涉
Structural dependences of the η~6 complexes of 3-amino-9-ethylcarbazole with chromium tricarbonyl fragment on third-order optical nonlinearities
2008年
Degenerate four-wave mixing measurements, using the 35 ps pulses at 532 nm, have been employed to investigate the third-order nonlinear optical parameters of two chromium tricarbonyl complexes η6-bonded to 3-amino-9-ethylcarbazole at either the NH2-substituted aryl ring (1) or the unsubstituted ring (2) and their precursor 3-amino-9-ethylcarbazole (AECz). The second-order hyperpolarizability γ of the compounds 1 and 2 were found to be 42.9×10-31 and 35.9×10-31 esu, respectively, approximately one order of magnitude greater than AECz. The relation between the molecular structure and second-order hyperpolarizability of the compounds 1 and 2 was explored in detail based on the three-level model and the density functional theory (DFT) calculation. The theoretical results indicate that the spatial distri-bution of electron density has the profound role in the third-order nonlinear optical properties.
YUAN YiZhongSUN ZhenRongWANG ZuGeng
氯化银纳米晶的自陷落激子态产生铌碲酸盐玻璃的光限幅效应被引量:2
2009年
利用熔融法结合扩散控制法制备了含有氯化银(AgCl)纳米晶的碲铌氧化物玻璃样品,运用吸收光谱观测到532nm附近AgCl的自陷落激子吸收峰.通过拉曼光谱表征获得玻璃的网络结构参数,结合Jahn-Teller模型分析了自陷落激子的形成机制.利用532nm皮秒脉冲激光研究了玻璃在近共振区的光限幅效应,通过Z扫描实验测量了样品的非线性吸收系数,研究表明在近共振和共振区自陷落激子态吸收导致光限幅效应的增强.
赵振宇林健贾天卿孙真荣王祖赓
关键词:光限幅氯化银纳米晶
Nonlinear optical properties of a self-organized dye thin film被引量:1
2007年
A self-organized thin film of a cyanine dye is fabricated by the spin-coating technique and is characterized by ultraviolet-visible spectroscopy, infrared (IR) spectroscopy, small-angle X-ray diffraction, eUipsometer, and atomic force microscopy (AFM). The nonlinear optical properties of the thin films are investigated by degenerate four wave mixing (DFWM) technique. The cyanine dye thin film sample exhibits high optical nonlinearities (χ^(3) = 2.55 × 10^-12 esu), and the mechanism is analyzed by the exciton coupling theory.
康海峰元以中孙真荣王祖赓
Raman spectroscopic investigations on the interactions of gastric cancer cells with 5-fluorouracil被引量:1
2008年
To study the efficacy and side effects of antitumor drug by the method of Raman spectroscopy, the cancerous (SGC-7901) and normal (GES-1) gastric cells were treated with 0, 25-, 100-, and 200-mg/L 5-fluorouracil (5-Fu) for 24 h, respectively, then Raman spectra of cells were recorded. The excitation wavelength was 514.5 nm and the Raman spectra in the region of 500 - 1800 cm^-1 were recorded. For the gastric cancer cells, as the concentration of 5-Pu increases, the band at 1094 cm^-1 attributed to the symmetric stretching vibration mode of PO2^- in the DNA backbone gradually decreases, and the intensity ratio of the band at 1315 cm^-1 to that at 1340 cm^-1 (I1315/I1340) shows the ascending trend, and the ratio of the band area at 1655 cm^-1 to that at 1450 cm^-1 (A1655/A1450) shows the slight ascending trend. For the normal gastric cells, these peaks also appear changes, however, the changes are weaker than those for the cancer cells. In SGC-7901 cells, 5-Pu can interfere with the DNA synthesis and result in the reduction of the DNA content. Besides, it can affect the unsaturation degree of the hydrocarbon chains and alter the external environment of guanine and adenine residues in cancer cells. The changes of Raman spectra for normal gastric cells reveal the side effect of 5-Fu.
郭建宇蔡炜颖杨继朋孙真荣
关键词:PLUTONIUM
Quantum coherent control of two-photon transitions by square phase-modulation
2008年
A femtosecond laser pulse can be tailored to control the two-photon transitions using the ultra-fast pulse-shaping technique. This paper theoretically and experimentally demonstrates that two-photon transitions in molecular system with broad absorption line can be effectively controlled by square phase-modulation in frequency domain, and the influence of all parameters characterizing the square phase-modulation on two-photon transitions is systemically investigated and discussed. The obtained results have potential application in nonlinear spectroscopy and molecular physics.
张诗按王祖赓孙真荣
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