快速检测试纸检测肉类食品安全

目的建立检测肉类食品安全的快速检测方法。方法使用快速检测试纸检测肉类掺假,以及肉类中残留的盐酸克伦特罗、莱克多巴胺与沙丁胺醇。结果使用猪肉检测快速检测试纸,检测羊肉中掺加的猪肉,掺加猪肉的比例为0.75%~25%,可以检出。使用胶体金检测仪结合快速检测试纸,检测肉类中添加的盐酸克伦特罗、莱克多巴胺与沙丁胺醇,盐酸克伦特罗的平均添加回收率在110%左右,莱克多巴胺的平均添加回收率为90%~120%,沙丁胺醇的平均添加回收率在110%左右。结论快速检测试纸适合对肉类食品安全进行现场快速筛查。     

蜂产品中硝基咪唑类药物残留高效液相色谱法研究

样品经盐酸稀释(蜂王浆另加氯化钠和正己烷去脂),磷酸二氢钾调节pH值后用二氯甲烷提取,盐酸反萃,过SCX SPE柱,磷酸氢二钾溶液(pH 8.8)洗脱,洗脱液用二氯甲烷萃取.紫外320 nm处检测,建立了检测蜂蜜和蜂王浆中甲硝唑、洛硝唑、地美硝唑、替硝唑、奥硝唑残留的高效液相色谱法.该方法检测蜂蜜和蜂王浆中5种硝基咪唑药物的检测限为0.01μg·g -1,定量限为0.001 μg·g-1,平均回收率范围各自为59.2%-70.6%和54.9%-69.1%,变异系数分别小于18%和16%,结果表明该方法符合残留检测的要求.     

用火焰原子吸收光谱法测中草药中的金属元素

在微波消解罐内用硝酸消化样品,采用火焰原子吸收光谱法对9种中草药中的K、Na、Mg、Mn、Fe、Zn、Cu七种金属元素进行分析测定,并研究了最佳实验条件。在选定条件下,钾的检测限为0.0019μg/mL,钠的检测限为0.0077μg/mL,镁的检测限为0.0024μg/mL,铁检出限为0.0047μg/mL,锌检出限为0.0032μg/mL,铜检出限为0.0052μg/mL,锰检出限为0.0028μg/mL,相对标准偏差为0.54%～3.2%,回收率为94.8%～101.7%。用于中草药中金属元素的测定,简便、省时、准确,结果满意。     

气相色谱法检测饮料中的盐酸氯胺酮

文中考察了液液提取-气相色谱法检测饮料中盐酸氯胺酮的条件.饮料检材中添加pH值为9.2的缓冲溶液,再用三氯甲烷提取,提取液浓缩后加内标烯丙异丙巴比妥,进行气相色谱法分析.以盐酸氯胺酮与烯丙异丙巴比妥色谱峰面积比Y对橙汁中盐酸氯胺酮浓度X(g/mL)进行线性回归,在0.02-25.0 g/mL浓度范围内,线性回归方程为Y=0.0055 0.4785X(r=0.9999),检测限为0.005μg/mL,平均提取率91.5%.该方法可用于饮料中的盐酸氯胺酮的提取检验.     

盐酸克伦特罗的电化学发光检测器的研究

基于2 [(叔丁氨基)甲基] 4 氨基 3,5 二氯苯甲醇酸盐(盐酸克伦特罗)对联吡啶钌(Ru(bpy)2 3)电化学发光信号有较强的增敏作用,建立了一种检测盐酸克伦特罗的电化学发光新方法.结果表明,在0.1mol/L的Na2HPO4介质中,以循环伏安为电解方式,联吡啶钌的浓度为1 0×10-6g/mL时,盐酸克伦特罗对联吡啶钌电化学发光信号的增敏效果最好,在此条件下,该方法对盐酸克伦特罗的线性范围为6.0×10-7～9.0×10-6g/mL,检出限为7.3×10-8g/mL,相对标准偏差RSD为3 9%(n=7,c=1 0×10-6g/mL).     

高效液相色谱法检测单基发射药中的二苯胺

采用不同的萃取条件对发射药进行处理,检测对二苯胺的萃取情况。考察不同试验条件下单基发射药中二苯胺的液相色谱行为,建立了二苯胺的HPLC测定方法。选用VenusilMP-C18色谱柱(250mm×4.6mm,5μm),用甲醇和水为流动相(80:20),流速为1mL/min,检测波长280nm。该方法的线性范围为(0.05—100)μg/mL,线性回归方程为:Y=708956X,相关系数r=0.9998。该方法最低检测浓度为0.05μg/mL。回收率在98%-102%之间,相对标准偏差均小于2%。说明方法简单,操作简便,结果准确可靠,可用于单基发射药中二苯胺的含量测定和控制。     

虚拟模板分子印迹固相萃取 高效液相色谱法检测果蔬中三唑类杀菌剂

采用本体聚合法自制了联苯三唑醇分子印迹聚合物(MIP),以此聚合物为固相萃取剂,制备固相萃取柱,对果蔬中烯唑醇、戊唑醇进行分离富集,并采用高效液相色谱法测定其在果蔬中的残留。烯唑醇平均回收率在74.6%⁸8.6%之间,检测限为0.5μg/mL。戊唑醇平均回收率在66.9%88.6%之间,检测限为0.5μg/mL。戊唑醇平均回收率在66.9%⁷3.3%之间,检测限为0.25μg/mL。     

猪内脏中盐酸克伦特罗的毛细管电泳电导检测

建立了可用于检测猪内脏中盐酸克伦特罗含量的毛细管电泳电导检测方法 ,考察了实验参数对分离、检测的影响。采用醋酸 /醋酸氨缓冲体系为运行电泳介质 ,在最佳实验条件下 ,盐酸克伦特罗的线性范围为 1 2～ 2 0mg/L ,检测限为 0 6mg/L ,是一种较好的检测盐酸克伦特罗的方法。     

气相色谱法检测饮料中的盐酸氯胺酮

文中考察了液液提取-气相色谱法检测饮料中盐酸氯胺酮的条件。饮料检材中添加pH值为9.2的缓冲溶液,再用三氯甲烷提取,提取液浓缩后加内标烯丙异丙巴比妥,进行气相色谱法分析。以盐酸氯胺酮与烯丙异丙巴比妥色谱峰面积比Y对橙汁中盐酸氯胺酮浓度X(g/mL)进行线性回归,在0.02-25.0g/mL浓度范围内,线性回归方程为Y=0.0055 0.4785X(r=0.9999),检测限为0.005μg/mL,平均提取率91.5%。该方法可用于饮料中的盐酸氯胺酮的提取检验。     

KMnO_4-HCHO化学发光反应体系测定白藜芦醇

在酸性介质中,高锰酸钾氧化白藜芦醇产生微弱的化学发光,甲醛对此体系有增敏作用,据此建立了一种化学发光测定白藜芦醇的新体系.在优化的实验条件下,白藜芦醇的浓度在0.005~1.000μg/mL范围内与发光强度呈良好的线性关系,方法的检测限为1.0 ng/mL.对浓度为0.1μg/mL的白藜芦醇连续进样11次,其RSD=0.76%.将本方法用于红葡萄酒中白藜芦醇的测定并做回收率实验,回收率为81%~116%.同时,在基于化学发光和紫外的基础上,对可能的机理进行了探讨.     

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。     

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.     

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.