血液与唾液中葛根素HPLC测定方法的建立

建立血液与唾液中葛根素的HPLC分析方法.色谱柱为ODS C18柱(150 mm×4.6mm，大连依立特公司)；流动相为乙腈-含0.8％冰醋酸的水溶液(22：78，V/V)；流速为0.8 mL/min；柱温为30℃；检测波长为250nm.葛根素血浆和唾液质量浓度标准曲线范围分别为5.0～350.0 μg/mL和0.1～...     

HPLC法测定恩施黄柏药材中黄柏碱与小檗碱的含量

考察恩施州8个县市不同海拔与环境对黄柏药材中黄柏碱与小檗碱含量的影响.采用高效液相色谱法测定黄柏碱与小檗碱的含量.黄柏碱的色谱条件:色谱柱:依利特ODS2 C 18柱(200mm×4.6 mm,5μm)流动相:乙腈:0.1％磷酸(每100ml中加0.2g十二烷基磺酸钠)=25∶75(V/V)检测波长:284 nm,流速:1.0 ml/min,柱温:30℃,进样量:20 ul;小檗碱的色谱条件:色谱柱:Kromasil C18(250mm×4.6mm,5 μm)流动相:乙腈:0.1％磷酸(每100ml中加0.2g十二烷基磺酸钠)=50∶50(V/V)检测波长:265 nm,流速:1.0 ml/min,柱温:30℃.通过系统的方法学考察,该方法快速、简单、重复性好,可用于黄柏的品质评价.适用于恩施黄柏药材的检测.     

反相高效液相色谱法测定舒必利的含量

建立一种新的反相高效液相色谱法测定舒必利的含量,以DiamonsilTM C18柱(250mm(4.6mm,5μm)为色谱柱,以磷酸二氢钾/四丁基溴化铵缓冲液-乙腈溶液(7:3,V/V)为流动相,检测波长230nm,流速1.0ml/min,柱温30°C,采用面积外标法定量。结果表明舒必利在20~120μg/ml范围内呈现良好的线性关系(r=0.9999),方法平均回收率为100.10%,其RSD=0.16%(n=4)。本方法精密、准确、简便、稳定、可靠,适用于舒必利的检测分析。     

高效液相色谱法测定畜禽肉中磷脂酰胆碱的含量

应用高效液相色谱法(HPLC)测定畜禽肉中磷脂酰胆碱含量。以Intertsil SIL硅胶柱(4.6mm×250mm,5μm)为分离柱,甲醇∶水(85∶15,V∶V)为流动相等度洗脱,流速1.5ml/min,柱温为室温,用紫外检测器在206nm处对磷脂酰胆碱进行测定。测得磷脂酰胆碱在0.5～1.92 mg/ml范围内线性关系良好(r2=0.9957),方法检测限为4.14μg/g,精密度为0.49%(n=5),回收率为89%～102%。该方法灵敏度高,重现性和稳定性比较好。     

反相高效液相色谱法测定发酵液中他克莫司含量

建立了发酵液中他克莫司的RP-HPLC测定方法.采用Kromasil C8 (250 mm×4.6 mm, 5 μm) 色谱柱,流动相为V(异丙醇)∶V(水)=35∶65,柱温50 ℃,流速1.0 mL/min,检测波长220 nm,对影响分离和检测的色谱柱、流动相、柱温、检测波长等进行了筛选.结果表明,他克莫司标准品质量浓度在10～100 mg/L范围内线性关系良好,线性方程为y=0.194 9ρ -0.055 3 (r=0.999 6),发酵液试样中他克莫司的平均回收率为99.8 % (n=9),相对标准偏差为0.58 %.     

HPLC手性固定相色谱法拆分新型钙拮抗剂MN9201

为了建立新型钙通道拮抗剂MN9201的高效液相色谱(HPLC)手性拆分方法,采用Daicel OJ-H手性固定相色谱分析柱(250 mm×4.6mm,5 μm),优化色谱条件,拆分MN9201消旋体.建立的HPLC手性拆分条件为:用Daicel OJ-H手性分析柱,以正己烷-异丙醇-三乙胺(91:9:0.1,V:V:V)为流动相,流速为0.5 mL/min,检测波长为237 nm,MN9201对映体可达到基线分离.本研究为MN9201单一对映异构体的分离、制备及含量测定等提供了简单、快捷的方法.     

HPLC法测定人参叶中人参黄酮苷的质量分数

采用高效液相色谱法,测定人参叶中的主要黄酮类成分人参黄酮苷[山柰酚-3-O-β-D-半乳糖(2→1)-β-D-葡萄糖苷]的质量分数.色谱条件:Zorbax Extend C18柱(250mm×4.6mm,5μm),流动相为V(甲醇):V(乙腈):V(体积分数为0.1%的醋酸水溶液)=25:5:70,流速为1.2mL/min,检测波长268nm,色谱柱温度为25℃.结果表明:在进样量0.5～20.0μg范围内线性关系良好,相关系数r=0.9999(n=6);人参黄酮苷的平均回收率为98.5%;RSD=0.64%(n=6)。     

反相高效液相色谱法测定发酵液中子囊霉素含量

建立用反相高效液相色谱法(RP-HPLC)测定发酵液中子囊霉素含量方法。采用Kromasil C18(250 mm×4.6 mm,5μm)色谱柱,以V(乙腈)∶V(水)=70∶30为流动相,柱温40℃,流速1.0 mL/min,检测波长210 nm,进样量20μL。子囊霉素标准品质量浓度在0.02~2.0 mg/mL范围内线性关系良好,线性回归方程为ρ=0.003 88A-0.001 41,r=0.999 97。平均回收率为99.79%(n=9),相对标准偏差(RSD)为0.45%。     

反相液相色谱法测定维生素D2微粒胶囊

采用反相高效液相色谱法测定维生素D2微粒胶囊中VD2的含量.用Alltech G18柱(150mm×4.6mm ID,3ug),流速为1.0 mL@min-1,流动相为V(甲醇)V(水)=9010,以苯并[e]芘为内标,UV265mm检测,本法简便、准确、重现性好[1][2].     

聚苯乙烯凝胶色谱法快速检测硫酸头孢噻利中缩合物杂质

采用聚苯乙烯基质的凝胶色谱柱对硫酸头孢噻利中的缩合物杂质进行分析。色谱柱使用MKF-GPC-300柱(300 mm×7.8 mm,7μm),流动相V(甲醇)∶V(水)=75∶25,流速1.0 mL/min,检测波长254 nm。液相色谱-质谱联用(LC-MS)结果表明:硫酸头孢噻利与其缩合物杂质实现了良好的分离,分析时间不到15 min,且方法、实验条件简单,操作方便,能快速有效地实现硫酸头孢噻利与其缩合物杂质的分离。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-