流动注射电化学发光法测定头孢拉定的研究

在强酸性介质中,基于初生态Mn(Ⅲ)直接氧化头孢拉定产生强化学发光,将在线恒电流电解产生Mn(Ⅲ)与流动注射技术结合,建立了流动注射电化学发光法测定头孢拉定的新方法.在优化的实验条件下,测定头孢拉定的线性范围为5.0×10-7～1.0×10-5g/mL,检出限为2.1×10-8g/mL,相对标准偏差为1.8%(n=11,c=2 0×10-6g/mL).所拟方法已用于针剂和胶囊中头孢拉定含量的测定.     

测定甲氧氯普胺的化学发光新体系

基于在碱性条件下,甲氧氯普胺能够与鲁米诺和亚铁氰化钾产生化学发光的现象,结合流动注射技术,建立了测定甲氧氯普胺的化学发光新体系.结果表明,该方法测定甲氧氯普胺的线性范围为8.0×10-8~1.0×10-4g/mL,检出限为4.0×10-8g/mL,对8.0×10-5g/mL的甲氧氯普胺标准溶液连续11次测定的相对标准偏差为1.6%.方法已成功应用于药片中甲氧氯普胺含量的测定.     

高锰酸钾-甲醛-()化学发光体系的研究

在甲醛存在下,高锰酸钾与()能够发生化学发光反应,产生很强的化学发光,由此建立了一种测定()的流动注射化学发光分析法.方法的检出限为4.5×10-8g/mL,相对标准偏差为1.3%(1.0×10-6g/mL(),n＝11),线性范围为1.0×10-7～1.0×10-5g/mL.该法已用于尿样中()的测定.     

反相流动注射抑制化学发光法测定扑热息痛

基于扑热息痛能抑制磷钼钒杂多酸氧化鲁米诺产生化学发光的原理,结合流动注射分析技术,提出了一个测定扑热息痛的化学发光新体系.扑热息痛在2.0×10-7~6.0×10-5 g/mL浓度范围内与化学发光信号呈线性关系,检出限为6×10-8 g/mL.对8.0×10-6 g/mL的扑热息痛进行11次连续测定,相对标准偏差为3.4%.该方法快速、灵敏,已经被成功地应用于小儿速效感冒灵中扑热息痛的测定.     

锰(Ⅳ)-甲醛流动注射化学发光体系测定酪氨酸

根据锰(Ⅳ)氧化酪氨酸可以产生弱的化学发光,甲醛对这一化学发光反应有较强的增敏作用的原理,建立了测定酪氨酸的流动注射化学发光分析法.实验结果表明,该方法检出限为2.0×10-7g/mL酪氨酸,线性响应范围为8.0×10-7～1.0×10-5g/mL.对5.0×10-6g/mL酪氨酸进行11次测定,相对标准偏差为2.1%.该法已应用于测定医用18 氨基酸注射液中的L 酪氨酸.     

鲁米诺-Cu(Ⅱ)-盐酸二甲双胍化学发光体系的研究

在Cu(Ⅱ)存在下,研究了luminol-Cu(Ⅱ)-盐酸二甲双胍化学发光体系,建立了测定盐酸二甲双胍的流动注射化学发光新方法.结果表明,在优化的实验条件下,化学发光强度与盐酸二甲双胍浓度在1.0×10-9~1.0×10-7g/mL范围内呈线性关系.该方法测定盐酸二甲双胍的检出限为5×10-10g/mL,相对标准偏差为1.1%(1.0×10-8g/mL盐酸二甲双胍溶液,n=11).该方法已用于片剂中盐酸二甲双胍含量的测定.     

分光光度法测定市售胶囊与针剂中头孢拉定含量

在弱酸性溶液中,头孢拉定能将Fe3+还原为Fe2,利用Fe2+与2,2’-联吡啶形成桔红色配合物在520nm处有最大吸收,从而建立了Fe2+-头孢拉定-2,2’-联吡啶分光光度法测定头孢拉定的新方法.头孢拉定标准溶液浓度在0.20～ 10.0μg/mL范围内与吸光度呈良好线性关系,线性回归方程为A=0.05664c (mg/L)+0.044,表观摩尔吸光系数为1.98×104Lmol-1·cm-1.该法用于市售胶囊与针剂中头孢拉定的含量分析,结果满意.     

流动注射化学发光法测定芬布芬

建立了一种测定芬布芬的流动注射化学发光新方法.在1.0×10-7～9.0×10-6 g/mL范围内,高锰酸钾-甲醛体系的相对化学发光强度与芬布芬浓度呈良好的线性关系,方法的检出限为1.5×10-7 g/mL.对1.0×10-6 g/mL芬布芬平行测定11次,相对标准偏差为1.0%.本方法可应用于片剂中芬布芬的测定,结果显示回收率为94%～97%.     

流动注射化学发光法测定间羟胺

在甲醛存在下,高锰酸钾在酸性溶液中可以氧化间羟胺,产生很强的化学发光,根据这一发现,采用流动注射技术,建立了利用高锰酸钾-甲醛-间羟胺化学发光体系测定间羟胺的化学发光分析法.方法的检出限为7.6×10-10g/mL,相对标准偏差为1.8%(5.0×10-8g/mL,n=11),线性范围为4.0×10-9～2.0×10-6g/mL.将本方法用于制剂和人的血清中间羟胺含量的测定,结果令人满意.     

鲁米诺-过氧化氢体系流动注射化学发光法测定乐果

基于有机磷农药乐果与碱性鲁米诺-过氧化氢体系的化学发光反应,直接对乐果进行检测,并对反应条件进行优化,据此建立了快速测定微量乐果的流动注射化学发光分析法.该方法的线性范围为1.0×10-8-1.0×10-5 g/mL,对1.0×10-6 g/mL的乐果标准溶液平行测定11次,相对标准偏差为2.1%,3σ检出限为8.0×10-9 g/mL,加标回收率为96.4%-103.5%.此法用于大米中乐果残留量的测定,结果令人满意.     

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.     

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.     

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.     

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.     

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.