7种常见食用菌中多糖的提取和测定

采用热水提取、乙醇沉淀的方法从7种食用菌中提取出了水溶性多糖,采用蒽酮-硫酸法在波长620nm处进行了糖含量的测定,求得其校准曲线的回归方程为y=0.0094x+0.0057,相关系数r为0.9998。平均回收率为98.3%—102.7%,RSD为2.1%—3.2%。结果显示粗多糖的提取率为4.44%—16.75%,多糖含量为3.48%—6.91%。     

蒙药阿木日-6多糖的提取与含量测定

本文采用热水提取-乙醇沉淀的方法从蒙药阿木日-6中提取多糖,采用硫酸-苯酚法进行了糖含量的测定,求得其回归方程为y=0.00745x 0.2172,相关系数为r=0.9991,平均回收率为102.1%,RSD=0.84%(n=5).     

蒙成药敖西根多糖的提取及含量测定

本文用热水提取了蒙成药敖西根中水溶性多糖,并用硫酸-苯酚法在波长为490nm处测定敖西根中多糖的含量,求得其标准曲线的回归方程为A=0.0140C-0.1500,r=0.9992,粗多糖产率为14.28%,平均回收率为99.8%,RSD 0.86%,糖含量为89.2%.     

蒙药呼和嘎日迪-9多糖的提取与含量测定

采用热水提取-乙醇沉淀的方法从蒙药呼和嘎日迪-9中提取多糖,分光光度法测定糖含量,求得校准曲线的回归方程为y=0.00656x＋0.324,相关系数为r=0.9994,平均回收率为101.2%,RSD=0.90%（n=5）。     

蒙药兴格各其满都啦-21中多糖的提取与含量测定

采用热水提取-乙醇沉淀的方法从蒙药兴格各其满都啦-21中提取多糖,用硫酸-苯酚法进行了糖含量的测定,求得其线性回归方程为y=0.00976x＋0.451,相关系数为r=0.9996,平均回收率为99.2%,RSD=0.80%（n=5）。     

蒙成药沏其日甘-5中多糖的测定

介绍了提取沏其日甘-5中水溶性多糖、碱溶性多糖的提取方法,并用硫酸-苯酚法测定了沏其日甘-5中总糖、水溶性多糖、碱溶性多糖、不溶性多糖和游离糖的含量.平均回收率为103.2%,RSD为0.91%.     

荞麦花水溶物中黄酮的提取及含量测定

用水将荞麦花中的水溶性成分提取后,再从水溶性提取物中将黄酮类物质分离,用硝酸铝-亚硝酸钠方法对黄酮的含量进行了测定,求得其校准曲线的回归方程为y=11.902x-0.021,相关系数为r=0.9996,平均回收率为100.8%,RSD=0.98%(n=5)。     

蒙药苘麻子中多糖的提取纯化及含量测定

采用热水提取-乙醇沉淀法从苘麻子中提取多糖,Sevag法除蛋白,苘麻子多糖经大孔树脂分离、透析得两种多糖,即QMZP-1和QMZP-2,采用分光光度法(λ=486nm)测定两种多糖含量,分别为1.8%和0.75%,求得校准曲线的回归方程为y=0.00435x+0.561,相关系数为r=0.9998,平均回收率为100.1%,RSD=0.71%(n=5)。     

蒙药嘎日迪-15中多糖的研究

用热水提取蒙药嘎日迪-15中水溶性多糖,经SephadexC-25进行提纯精制得纯糖,采用硫酸-苯酚法测定了其水溶性多糖含量.方法的平均回收率为100.50%,RSD为0.82%.用GC测定了蒙药嘎日迪-15中水溶性多糖主要由木糖、甘露糖、半乳糖、葡萄糖组成,其摩尔比为1.03:1.26:0.77:2.30.用溴化钾压片法测得的红外谱图显示多糖的特征吸收峰为3 417.46,2 928.65,1 742.86,1 643.69,1 149.78,1 078.19,1 022.56,834.57 cm-1,其中1 078.19和1 022.56 cm-1为吡喃糖特征峰,834.57 cm-1是α-吡喃糖苷键的特征吸收峰.紫外谱图在280 nm处有明显的糖吸收峰,说明有C=O键存在.     

粗江蓠多糖的提取及光谱分析

采用热水浸提和乙醇沉淀的方法提取粗江蓠多糖(gracilaria gigas harvey polysacchrides,GHPS),用苯酚-硫酸法测定糖含量,等离子体原子发射光谱(ICP)测多糖中矿物元素的含量,傅里叶红外光谱仪(FTIR)分析糖类官能团.结果表明:采用热水浸提和乙醇沉淀的方法提取粗江蓠多糖提取率达14.98%,苯酚-硫酸法测得提取物多糖含量为78.2%;ICP测得粗江蓠多糖含Ca,Fe,Mg和S等矿物元素;FTIR分析GHPS有一般糖类物质的特征吸收峰,是一种酸性多糖,同时存在呋喃环和吡喃环.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

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.     

Quick single-photon detector with many avalanche photo diodes working on the time division

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.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.