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铟(Ⅲ)-8-羟基喹啉-核酸三元荧光体系的研究与应用 总被引:2,自引:1,他引:1
基于核酸对铟(Ⅲ)-8-羟基喹啉配合物的荧光增强作用,应用铟(Ⅲ)-8-羟基喹啉为荧光探针,研究了铟(Ⅲ)-8-羟基喹啉与核酸的作用,建立了新的核酸测定方法。在最佳条件下,ctDNA、hsDNA、smDNA和yRNA的线性范围分别为0.20-1.40μg/mL、0.20-1.60μg/mL、0.10—1.40μg/mL、0.20—1.20μg/mL。检出限(3o/K)分别为0.004μg/mL,0.002μg/mL,0.002μg/mL,0.002μg/mL;测定实际样品,回收率为90.9%-103.5%。 相似文献
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固相微萃取-气相色谱法检验盐酸氯丙嗪 总被引:9,自引:0,他引:9
本文研究了固相微萃取(SPME)-气相色谱法提取检验盐酸氯丙嗪的最优条件。结果表明,以下实验条件效果最好:以涂敷有30μm厚的聚二甲基硅氧烷的石英纤维直接萃取水中盐酸氯丙嗪时,溶液pH值为8,吸附温度为80℃,萃取20min,在250℃下解吸5min。在1-1000μg/L浓度下,色谱峰面积与溶液浓度呈线性关系,其回归方程为y=16465 1807.9x(r=0.99997),检出限为0.84μg/L,用此法测定茶水中盐酸氯丙嗪,平均回收率为96.05%。 相似文献
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氢化物原子荧光光谱法测定水产品中的痕量汞 总被引:10,自引:1,他引:9
本文研究和确定了氢化物原子荧光光谱法检测水产品中汞的适宜检测条件,建立了V2O5-HNO3-H2O2消解体系,并以硫脲作为掩蔽剂,低浓度硼氢化钾为还原剂。本方法线性范围为0-80μg/L;相关系数r≥0.9997;检出限为0.005μg/L;相对标准偏差为0.89%-2.64%;回收率为95.7%-104.3%,可广泛用于水产品中汞的检测。 相似文献
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分散液液微萃取-分光光度法测定环境水样中孔雀石绿 总被引:1,自引:0,他引:1
建立了简便、快速、有效的分散液液微萃取-分光光度法测定环境水样中孔雀石绿的分析方法。对萃取剂、分散剂的种类和体积、萃取时间、离心时间、盐浓度等影响萃取效率的因素进行了优化。在优化的萃取条件下,方法的线性范围为8—1000μg/L(r=0.9992),相对标准偏差(RSD)为4.1%(C=100μg/L,n=6),检出限为4.20μg/L。对3种实际水样中的孔雀石绿进行测定,加标回收率在74.7%—108.2%之间(n=5)。方法适用于环境水样中的痕量孔雀石绿的检测。 相似文献
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Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide 总被引:1,自引:0,他引:1
Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs. 相似文献
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A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output. 相似文献
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S. G. Nedel’ko M. A. Krysyuk A. L. Apanasenko L. N. Lymarenko Z. T. Moroz 《Journal of Applied Spectroscopy》1997,64(1):55-61
Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped
with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly
described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation
(5.5·104 Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum
cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics
of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure
crystals is analyzed (preliminarily).
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997. 相似文献
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The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper. 相似文献
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A multi-conjugate adaptive optics (MCAO) can offer a possibility of widening field of view (FOV) characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle's expressions of two deformable mirrors (DMs) MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance. 相似文献
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Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use. 相似文献
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We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed. 相似文献
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Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell. 相似文献