HPLC法测定奶粉中痕量炔雌醇

建立了高效液相色谱（HPLC）法测定奶粉中炔雌醇残留量的方法。样品以乙腈振荡萃取、离心,提取液浓缩后经O．45μm滤膜过滤,冷冻去脂,进高效液相色谱仪分析。研究了萃取溶剂、萃取及浓缩方式对萃取效率的影响,确立了色谱检测条件。乙腈-水（50：50）为流动相,流速1mL／min,柱温30℃,检测波长224nm。方法的检出限为16μg／kg,加标回收率在86．5％～97．0％之间,工作曲线的相关系数为0．9990,相对标准偏差为0．95％～2．01％（n=3）。方法快速、灵敏度高、分离效果好,样品处理简单、无杂质干扰,能够满足奶粉中雌激素分析的需要。     

N＇-（4，6-二甲氧嘧啶-2-基）-N-β-吡啶甲酰基硫脲的高效液相色谱分析

建立了N’-（4，6-二甲氧嘧啶-2-基）-N—β-吡啶甲酰基硫脲的高效液相色谱分析方法，采用ODS色谱柱，以乙腈：水=90：10（v：v）为流动相，流速1mL／min进行分离，以紫外检测器在波长224nm下进行测定．该方法回收率在98．76％-100．18％之间，线性相关系数为0．9996，标准偏差为0．119，变异系数为0．123％．     

HPLC法测定水产品中欧索林酸残留量

研究了鱼类养殖中残留在鱼体内的欧索林酸的高效液相色谱（HPLC）检测方法．样品中欧索林酸在酸性条件下用乙腈提取，采用液液分配方法净化除去共存提取干扰物质后，用带有荧光检测器的高效液相色谱仪检测．方法的检测限为1.0μg／kg，线性范围2．5—50．0μg／L，相关系数r=0．9995，添加1．0，6．0和10．0μg／kg浓度水平，平均回收率分别为94.0％、83.7％和82．6％，相对标准偏差分别为5．1％、5．8％和2．5％．该方法具有高灵敏度、简单、快速和低成本等特点，适用于检验机构检测和食品加工企业产品控制．     

HPLC法检测发酵液中的木糖和木糖醇

建立高效液相色谱检测发酵液中木糖和木糖醇含量的分析方法．色谱柱为ZORBAX碳水化合物，柱温30℃，流动相为乙腈：水=80：20（V／V），流速1．2mL／min，示差折光检测器检测．木糖和木糖醇在 0．5～40．0mg／mL范围内浓度与峰面积线性关系良好（R2分别为0．9931和0．9947），平均回收率分别为99．80％（n=5，RSD=1.35％）和99．62％（n=5，RSD=1．65％）．方法简便、快速、准确。     

高效液相色谱-串联质谱法检测蔬菜、水果中阿维菌素、甲维盐残留

建立高效液相色谱-串联质谱同时检测蔬菜、水果中阿维菌素和甲维盐残留的方法．样品用乙腈高速匀浆提取,氨基固相萃取柱净化,在加热电喷雾离子源正离子模式采集,三重四级杆质谱仪选择性反应监测模式下进行测定．阿维菌素和甲维盐在5．0450．0μg／L范围内具有良好的线性关系（r〉0．995）．在基质样品中添加5、10和20μg／kg3个水平的药物,其平均回收率范围为72．3%-108．6％,相对标准偏差为3．6%-12．6％,可以满足蔬菜和水果中阿维菌素与甲维盐的同时检测．     

反相高效液相色谱法测定血浆中多沙唑嗪

采用固相萃取反相高效液相色谱法测定小鼠血浆中的多沙唑嗪．血浆样品经过C18固相萃取小柱净化后,在 YMC C18色谱柱(4．6 mm×250 mm,5μm)上,以甲醇-0．02 mol／L磷酸二氢钾溶液(体积比70:30,pH 3．0)为流动相,流速0．6 mL／min,检测波长246 nm对多沙唑嗪进行测定．实验结果表明,多沙唑嗪的血药浓度在0．2-50 μg／mL范围内与峰面积呈良好线性关系,平均回收率为99．06％,精密度为2．5％,最低检测限为0．1 μg／mL,该方法简便、快速、准确度高、可靠性好．     

五味子中117种农药多残留气相色谱-串联质谱检测方法研究

建立了五味子中117种农药多残留气相色谱串联质谱（GC-MS／MS）检测方法。样品经乙酸乙酯-乙腈（30：70,v／v）超声振荡提取,凝胶渗透色谱技术（GPC）净化GC—MS／MS测定。117种农药在五味子样品中的最低定量限（LOQ,S／N=10）为0．005-0．2mg／kg。每种农药在五味子基质中,添加0．005-0．2mg／kg范围内（n=5）,回收率为62．1％～122．8％,相对标准偏差（RSD）为3．1%～17．8％。在0．01～5．0μg／mL的浓度范围内,各农药均具有良好线性。     

HPLC法测定人参花中绿原酸的含量

建立以高效液相色谱法测定人参花中绿原酸含量的方法．色谱柱为ODS—C18（250mm×4．6mm,5μm）,流动相为乙腈-0．5％磷酸溶液（30：70）,流速为1．0mL／min,检测波长为326nm,柱温为25℃．绿原酸在0．4～4．0μg范围内与峰面积积分值呈良好的线性关系（R=0．9991）;平均回收率为99．28％,RSD=1．46％（n=6）．本法简便、准确、重现性好、可用于人参花茶的质量控制和评价．     

HPLC法测定小儿氨酚黄那敏颗粒剂中噩乙酰氨基酚含量

目的：用反相高效液相色谱法测小儿氨酚黄那敏颗粒中对乙酰氨基酚含量。方法：采用C18色谱柱,流动相为甲醇：0．05mol／L醋酸铵溶液（15：85）,检测波长为257nm。结果：对乙酰氨基酚在6-361．Lg／ml浓度范围内线形关系良好,r=-0．9999,平均回收率99．28％（n=5）,RSD=0．62％（n=5）。结论：该方法简单、快速、准确,可以有效地控制药品质量。     

盐酸洛美沙星软膏中盐酸洛美沙星含量测定研究

目的：建立测定洛美沙星软膏中盐酸洛美沙星含量的方法。方法：使用高效液相色谱法,色谱柱为Diamonsil C18柱（250min×4．6mm,5μm）,检测波长287nm,0．020mol／L磷酸溶液（以三乙胺调节pH至3．3）-乙腈（75：25）为流动相,柱温25．0℃,流速：0,9mL／min．。结果：在20.0μg／mL-120．0μg／mL范围内有良好的线性,平均回收率为93．66％,RSD为0．84％（n=6）。结论：该方法结果准确,灵敏度高,重现性好,可为盐酸洛美沙星软膏的质量控制提供依据。     

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.