HPLC法同时测定葡萄酒中甘油和糖类化合物及其应用的研究

葡萄酒样经0.45um滤膜过滤后,用HPLC法直接测定葡萄酒中的甘油、果糖,葡萄糖和蔗糖,与标准方法相比具有速度快,操作简便,测定结果准确的特点。上述每种化合物的检测量均低于O.5ug,变异系数均小于2％(n=9)。用该方法检测了全国85种葡萄酒中甘油和糖类化合物的含量,并讨论了甘油含量与原酒含量的关系。     

分光光度法测定发酵液中链霉素的效价

建立使用分光光度法测定发酵液中链霉素效价的方法。发酵液经草酸预处理后,利用链霉素的专属反应——麦芽酚反应,用硫酸铁铵溶液作为显色剂,于520nm波长下测定吸光度。检测过程中以链霉素失活的发酵液作为对照,成功排除了发酵液颜色对吸光度的干扰。结果表明:链霉素效价在146.2～1023.4u/mL范围内,吸光值与效价呈良好的线性关系,r=0.9991,平均回收率为99.16%(RSD=0.94%,n=5)。该法简便、准确、回收率高,可快速测定发酵液中链霉素效价。     

HPLC快速测定发酵液中L–色氨酸

建立一种测定发酵液中L–色氨酸的高效液相色谱(HPLC)方法.以Agilent C18(5μm,150.mm×4.6.mm)为分离柱,V(0.03%的KH2PO4溶液)﹕V(甲醇)=90﹕10为流动相,流量为1 mL/min,在278.nm处检测L–色氨酸.该方法简便、快速、准确,在0.000～1.000.g/L范围内线性关系良好(R2=0.999 9),平均回收率为98.93%,精密度(RSD)为0.247%,可有效应用于发酵液中L–色氨酸含量的测定.     

OPA柱前衍生法测定硫酸新霉素的含量

建立了一种硫酸新霉素的HPLC分析方法.以邻苯二甲醛(OPA)为衍生化试剂进行柱前衍生化,334nm作为检测波长,流动相为甲醇水溶液(V甲醇∶V水=70∶30),标准曲线为Y=1×106X+4.123 8×104,r=0.998 3,平均回收率为99.48%.用该方法测定发酵液中硫酸新霉素的含量取得了满意的结果.     

淘米水发酵物中2种有机酸的测定

采用高效液相色谱法分析测定淘米水发酵液中的有机酸,确定了淘米水发酵液中有机酸分析测定的色谱条件,采用Agilent Zorbax SB-Aq(4.6 mm×150 mm,5μm)色谱柱,流动相为1%甲醇-99%NaH_2PO_4溶液(20 mmol/L,pH=2.0);紫外检测波长210 nm;流速0.4 mL/min;柱温25℃.结果表明,在该条件下淘米水发酵液中的有机酸得到了较好分离,分离检测出乳酸、乙酸2种有机酸.该分析方法简单准确,适用于淘米水发酵液中有机酸的测定分析.     

钼对红霉素生物合成的影响

在利用糖多孢红色链霉菌HB发酵生产红霉素的过程中,于48 h向发酵液中加入钼酸钠,通过对代谢途径关键调控酶活力的测定以及运用高效液相色谱法对发酵液中相关有机酸含量的测定,结论显示:当发酵液中钼酸钠的加入量为0.056 g/100 mL时,部分代谢流向有利于红霉素生物合成的方向迁移,在一定程度上提高了红霉素的生产速率和产量.     

冠突散囊菌发酵液多糖测定条件优化研究

选取茯砖茶中优势微生物冠突散囊菌,进行液体发酵培养,利用水提醇沉淀法提取发酵液中多糖.以苯酚-硫酸法测定总多糖含量,探寻操作过程中苯酚用量、硫酸用量以及显色时间对多糖含量测定的影响,并在单因素试验结果的基础上进行正交试验优化.研究结果表明,3个因素对冠突散囊菌发酵液多糖含量测定的影响程度依次为:浓硫酸用量显色时间苯酚用量,当5%苯酚用量为0.6 m L、浓硫酸用量为7.0 m L、显色时间为40 min时,可以获得苯酚-硫酸法对冠突散囊菌发酵液中多糖含量的最佳测定效果.     

柱前衍生化HPLC法测定发酵液中L-瓜氨酸和L-鸟氨酸含量

建立一种应用异硫氰酸苯酯将L-瓜氨酸和L-鸟氨酸柱前衍生后进行定量分析的高效液相色谱法.实验结果表明,瓜氨酸在0.2～2.0 mg/mL范围内线性回归显著(R2=0.999 8),平均回收率99.87%;鸟氨酸在0.2～2.0 mg/mL范围内线性回归显著(R2=0.999 7),平均回收率100.92%.应用该方法对发酵液中L-瓜氨酸和L-鸟氨酸含量进行测定取得了满意的结果,能有效指导谷氨酸棒杆菌L-瓜氨酸的发酵生产.     

外推法测定甘油和硼酸反应平衡常数

探索了利用电位法[1]测定甘油和硼酸反应的平衡常数。在不同浓度下,甘油与硼酸反应生成硼酸甘油酯,通过电位法测定溶液的pH值,间接测定硼酸甘油酯的含量,通过逐步逼近法,外推到浓度接近零时的平衡常数,得到甘油与硼酸反应的平衡常数为K=3.0×1-0 9。     

酵母细胞麦角固醇含量测定的研究

以石油醚取代正庚烷和乙醚作为萃取剂对麦角固醇含量进行了测定，并分析和比较了皂化，干细胞或湿细胞提取等条件对麦角固醇含量测定的影响，在此基础上，提出了一种快速测定发酵液中酵母麦角固醇含量的方法。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to