反相高效液相色谱法(RP-HPLC)测定丙酮酸发酵液中丙酮酸

提出一种利用反向高效液相色谱法(RP-HPLC)测定丙酮酸发酵液中丙酮酸的方法。应用反相C18色谱柱 ODS-2 HYPERSIL 250 mm×4．6 mm 5μm,以0．05 mol·L-1NH4H2PO4(用H3PO4调pH2．6)为流动相,发酵液经稀硫酸预处理后直接进样分离定量,每一样品的分析过程不超过5 min,可及时了解丙酮酸发酵过程中丙酮酸的变化,适于发酵液中丙酮酸的检测。     

RP-HPLC同时检测 Zymomonas mobilis 代谢组分方法的研究

优化了高效液相色谱(HPLC)同时检测Zymomonas mobilis发酵液中葡萄糖、乙醇和多种代谢产物的条件和方法,分析了影响因素、回收率和重现性.试验结果表明,选择10 mmol/L pH值为2.5 KH2PO4-H3PO4溶液作为流动相、SunFireTM C18,5μm色谱柱(4.6 mm×150 mm)、二极管阵列检测器,可同时检测出葡萄糖酸、丙酮酸、乳酸、乙酸;选用2 mmol/L硫酸溶液作为流动相、IC-PakTM lon-Exclusion 50 A7μm色谱柱(7.8 mm×300 mm)、示差折光检测器,可同时检测葡萄糖、山梨醇、琥珀酸、乙酸、乙醇.Z.mobilis发酵液的回收率和重现性的结果表明,该方法测定葡萄糖、乙醇和其它产物的相对标准偏差范围为0.005%～0.018%,平均回收率为96.86%～101.99%.     

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.     

麦糟发酵液中单糖及糖醇的高效液相色谱分析

建立高效液相色谱测定麦糟发酵液中的阿拉伯糖、阿拉伯糖醇及木糖醇的分析方法.色谱柱为Sugar-PakI柱,柱温80℃,流动相是去离子的无菌水,含50mg/LEDTA钙盐,流速为0.4ml/min,示差折光检测器检测.在此条件下发酵液中的阿拉伯糖、阿拉伯糖醇及木糖醇的峰面积与其浓度线性关系良好,相关系数R2在0.9964-0.9988之间,回收率在98.6-100.9%之间.方法简便、快速、准确.     

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 %.     

发酵液中Monacolin K的高效液相色谱分析方法研究

对高效液相色谱(HPLC)测定发酵液中Monacolin　K的含量进行了研究，找到了最佳流动相配比和流速等条件。通过测定其重视性、回收率等项指标，证明此方法对有效物质的检测具有准确、快速的特点。     

3种植物生长调节剂的HPLC分离分析方法

在系统优化了流动相组成、流速及柱温等色谱条件后,采用Waters C18色谱柱(4.6 mm×250 mm,5μm)为固定相,体积比为40∶60的甲醇-水(含0.2%冰醋酸和0.1%四氢呋喃)二元溶剂体系为流动相,在流速为1.0 mL/min,柱温为30℃,进样量为10.0μL,检测波长为210 nm的条件下,建立了1个同时分离测定赤霉素(GA)、6-糠氨基嘌呤(6-KT)和吲哚乙酸(IAA)的高效液相色谱方法.该方法可以在12 min内实现微生物菌体及其发酵液中这3种组分的同时分离测定,相对标准偏差在5.0%以内,回收率在106.5%～91.9%之间.     

氢化可的松HPLC测定方法的研究

利用ＨＰＬＣ对发酵液中氢化可的松的测定方法进行了研究。确定了当采用色谱柱ＯＤＳ时的色谱条件检测波长２４２ ｎｍ ，流动相体积比为甲醇∶水＝ ６５∶３５、流速０．７ ｍ Ｌ／ｍ ｉｎ 等。通过重现性及回收率试验，表明本方法快速有效、结果准确     

利用高效液相色谱法同时测定土曲霉发酵液中衣康酸及残糖

建立了高效液相色谱(HPLC)快速测定土曲霉发酵液中衣康酸及残糖的分析方法。使用TOSOH Tskgel o Apak-A色谱柱,以0.75 mmol/L H2SO4为流动相,在柱温45℃,流速1.0 m L/min的条件下,采用示差折光检测器进行检测。结果表明,该方法在20 min内可实现发酵液中衣康酸和葡萄糖的完全分离与定量。衣康酸在0~10.056 g/L范围内的线性关系良好,相关系数为0.999 9,相对标准偏差(n=6)为0.33%,加标回收率100.88%~102.74%。葡萄糖在0~6.016 g/L范围内的线性关系良好,相关系数为0.999 9,相对标准偏差(n=6)为0.12%,加标回收率101.26%~103.12%。该法适用于土黄霉发酵液中衣康酸和葡萄糖的快速、高效分离和定量测定。     

利用高效液相色谱检测发酵液中S-腺苷蛋氨酸含量

建立了利用Waters2695高效液相色谱测定毕赤酵母发酵液中S-腺苷蛋氨酸(S-adenosylmethi-onine,SAM)含量的方法,对HPLC-UV法检测SAM含量的色谱条件进行优化,最佳色谱条件如下:All-tima C18柱,150 mm×4.6 mm,5μm,流动相为V(0.01 mmol/L甲酸铵)∶V(甲醇)=97∶3,流速0.6 mL/min,柱温30℃,检测波长260 nm.优化后的色谱分离条件可使样品中的SAM与杂质达到较佳分离,稳定性、精密度及重复性都较好,其RSD均小于1.5%.利用SAM标品制作标准曲线Y=32408606.0721 X+130181.2824,线性范围为0.012～1.2 g/L,R2达到0.9998,平均回收率为100.027%～102.533%.此方法可有效地检测发醇液中S-腺苷蛋氨酸含量.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.