定量测定盐酸安他唑啉中有机溶剂残留量

使用DB-17大口径毛细管柱,WFID检测器,定量测定盐酸安他唑啉中残留溶剂并确定了色谱条件.结果表明,乙醇的线性方程Y=0.046 27+0.653 69 X, r=0.998 16 (n=8), 线性范围50.35～718.9 g/L;甲苯的线性方程Y=0.019 28+1.643 19 X,r=0.993 72 (n=8),线性范围11.6～162.4 g/L;DMF线性方程Y=0.025 31+0.356 54 X ,r=0.993 44 (n=8),线性范围9.8～137.2 g/L.盐酸安他唑啉中乙醇加标回收率98.32%,RSD为6.79%;甲苯加标回收率98.17%,RSD为1.5%;DMF加标回收率98.99%,RSD为2.34%,可用于产品检测.     

牛奶中硫氰酸盐高效液相色谱测定方法

建立了高效液相色谱法分析牛乳中硫氰酸盐的方法.以戴安IonPac AS19(4 mm×250mm)阴离子色谱柱进行分离.二极管阵列检测器测定,流动相为0.05 mol/L Na2HP04溶液(pH值约为9.3),流速为0.8 mL/min,进样量10μL,检测波长218 nm.结果表明,牛奶中硫氰酸盐线性范围为5～100μg/mL,加标回收率为67.1%～101.8%,相对标准偏差(n=3)小于4.4%,最低检出限为0.5μg/mL.     

RP-HPLC定量检测蛹虫草培养基中活性成分

建立一种反向高效液相色谱法定量检测蛹虫草培养基中活性成分腺苷含量和虫草素含量的方法.色谱柱为Eclipse XDB-C18柱(4.6 mm×150 mm,5μm);流动相:0.02 mol/L KH2PO4∶甲醇(体积比85∶15)溶液;流速:1.0 mL/min;检测波长:260 nm.腺苷的线性测量范围为0.5~100μg/mL(R=0.999 9),平均回收率为105.3%,标准品RSD=0.76%(n=5),样品RSD=1.87%(n=5);虫草素的线性测量范围为0.5~100μg/mL(R=0.999 9),平均回收率为104.0%,标准品RSD=0.95%,样品RSD=1.23%.本测定方法线性范围宽、分离度好、具有良好精密度,可定量、准确分析不同蛹虫草培养基中活性成分腺苷和虫草素含量.     

催化过氧化氢氧化钙黄绿素褪色光度法测定痕量铁

基于Fe(Ⅲ)对过氧化氢氧化钙黄绿素的催化反应,建立了高灵敏测定痕量铁的新方法.本法线性测定范围为0.4～4ìg/L,检出限为1.4х10-10g/mL,线性回归方程为ΔA=-0.0033 0.03812CFe3 (ìg/L),相关系数r=0.9991.本法已用于人发、茶叶中铁含量的测定,结果满意.     

HPLC法同时测定四季三黄丸中盐酸小檗碱、黄芩苷和栀子苷的含量

建立了一种同时测定四季三黄丸中盐酸小檗碱、黄芩苷和栀子苷含量的反相高效液相色谱(RP-HPLC)法.色谱条件为Agilent Zorbax SB-C18分离柱(250 mm×4.6 mm,粒径5μm),乙腈-6 mmol/L KH_2PO_4流动相梯度洗脱,流速1.0m L/min,多波长切换检测.结果表明,盐酸小檗碱、黄芩苷和栀子苷线性范围分别为3.8 28.4μg/m L(r=0.999 8),16.5 123.8μg/m L(r=0.999 6)和3.8 28.4μg/m L(r=0.999 7),加样回收率分别为97.2%(RSD=1.5%),97.7%(RSD=2.6%)和102.9%(RSD=2.8%).本方法可以同时分析四季三黄丸中盐酸小檗碱、黄芩苷和栀子苷含量,对该制剂质量进行有效监控.     

LC/MS对烘焙食品中乙酰磺胺酸钾(安赛蜜)含量的检测

以超高效液相色谱质谱联用仪(LC/MS)法检测烘焙食品中乙酰磺胺酸钾(安赛蜜)的含量。采用Eclipse Plus C18柱(3.0×100mm,1.8μm)分离;以乙腈-0.47 g/L乙酸铵水溶液(含0.2%(v/v)甲酸)为流动相进行梯度洗脱,流速为0.3mL/min,柱温35℃;以多反应离子监测(MRM)为检测方式,采用负离子扫描,喷雾器压力45 psi,碰撞氮气气流量8L/min;离子源温度350℃;毛细管电压4000V;光电倍增管电压600 V。安赛蜜在10.0μg/L¹00.0μg/L范围内线性良好(r2>0.999),方法的定量限(LOQ)为10.0μg/L,检测信噪比大于10,满足实际检测需要。加标回收率在92.3%100.0μg/L范围内线性良好(r2>0.999),方法的定量限(LOQ)为10.0μg/L,检测信噪比大于10,满足实际检测需要。加标回收率在92.3%⁹9.8%之间,相对标准偏差(RSD,n=6)为4.5%99.8%之间,相对标准偏差(RSD,n=6)为4.5%⁶.0%,检测结果令人满意。     

基于聚乙烯醇缩丁醛和金溶胶修饰的电位型铂金免疫传感器的研制

报道了一种基于聚乙烯醇缩丁醛(PVB)和金溶胶,把乙型肝炎表面抗体(HBsAb)固定在铂金电极上,用来检测乙型肝炎表面抗原(HBsAg)的一种新型电位型免疫传感器.该传感器制作简单、响应时间较短(<3min)、具有良好的选择性和灵敏度,线性范围是4 4μg/L～240μg/L,检出限(3σ)为1 4μg/L.将该电极用于临床上对乙型肝炎表面抗原的检测,与酶联免疫法相比,符合率为91 3%.     

增强化学发光酶联免疫分析用于伏马菌素B_1的快速检测

以抗原-抗体的免疫反应及化学发光为基础,以辣根过氧化物酶(HRP)标记伏马菌素B_1(FB_1)为半抗原、鲁米诺-H_2O_2为发光底物,对羟基联苯为化学发光增强剂,建立了一种新型的FB_1快速检测方法——增强化学发光酶联免疫分析法,相关系数R为0.991 6,线性范围为200~1 400μg/L,检测限为91.3μg/L.在不同的加标水平下,回收率为85.9%~115.4%,与之相对应的板内RSD为9.1%~10.2%(n=6),板间RSD为10.6%~12.4%(n=6),与其他真菌毒素交叉反应率较低.与传统的检测方法(酶联免疫吸附测定和高效液相色谱法)进行了比较,结果表明,本研究建立的方法灵敏度高、特异性好、操作简单、检测快速,能够用于大批量实际样品的快速检测.     

毛细管电泳法检测微透析液中的头孢唑林钠

微透析(MD)与毛细管电泳(CE)相结合,原位、在体、实时监测了家兔血液中头孢唑林钠(Cefazolinsodium,CFZ)浓度的变化,并初步研究了CFZ的药代动力学.结果表明,在50mmol/L的硼砂(pH9.5)缓冲液,20kV分离电压,214nm紫外检测的毛细管电泳条件下,以环丙沙星为内标,CFZ在15min之内与内标物及透析液中的其他物质达到了良好的分离.在此条件下,CFZ测定的线性范围为1～300μg/mL,检出限为0.3μg/mL(3σ),绝对检出限为2.7×10-12g.微透析灌流速度为3μL/min,探针透析率为31.8±6.8%(n=3).测定结果经NDST药动学软件分析表明,CFZ在家兔体内的清除半衰期为24.5min.     

醋酸纤维素扩散限制膜修饰葡萄糖生物传感器

为拓宽葡萄糖生物传感器检测的线性范围,分别利用质量浓度为0g/L、10g/L、15g/L、20g/L、25g/L和30g/L醋酸纤维素扩散限制膜,对以二茂铁为电子媒介体明胶戊二醛固定葡萄糖氧化酶制备的葡萄糖丝网印刷金电极进行修饰,研究了醋酸纤维素扩散限制膜对葡萄糖生物传感器性能的影响.结果表明,醋酸纤维素扩散限制膜有效地拓宽了葡萄糖生物传感器检测的线性范围,质量浓度为20g/L醋酸纤维素制备的扩散限制膜修饰的葡萄糖生物传感器性能最优,具有良好的产业化前景,其检测线性范围为0～30mmol/L,响应时间为10s,灵敏度为31.4μA/(mol·L-1),相关系数为0.99733.     

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.