苏木精荧光共振光散射法测定DNA

用共振光散射技术建立了以苏木精为荧光探针测定DNA含量的方法.在pH 7.3的Tris-HCl缓冲溶液中,DNA的存在使苏木精共振光散射强度增强且与DNA溶液浓度呈线性关系,线性范围为0.5～100μg/mL,检测限为3.61μg/mL.反应体系的热力学参数△H＜0,△S＞0,说明促使苏木精与DNA发生作用的主要驱动力是疏水作用力和静电作用力.     

固黄O-CTMAB-DNA三元体系的共振光散射光谱的研究及应用

研究了脱氧核糖核酸(DNA)与阴离子染料固黄O(FYO)及阳离子表面活性剂溴化十六烷基三甲铵(CTMAB)三元体系的共振光散射光谱的特征.考察了各种影响因素,在优化条件下确立了共振光散射强度与鱼精DNA和小牛胸腺DNA以及变性后的鱼精DNA和小牛胸腺DNA浓度之间的关系,相应的线性范围分别为0.026～7.00 mg/L;0.025～7.00 mg/L;0.032～6.00 mg/L;0.031～8.00 mg/L,相关系数为0.999 1;0.999 6;0.998 1;0.999 6,检出限分为7.0,6.0,11.0,12.5 μg/L,基于共振光散射的增强,建立了一种测定DNA的新方法.图6,表4,参8.     

中性红用于痕量DNA测定

在pH 7 6～ 7 8和低离子强度条件下 ,中性红 (NR)与DNA作用产生以 53 5 0nm和 3 50 0nm为特征的共振光散射增强 (ERLS)光谱 .研究表明 ,在最佳条件下 ,在 53 5 0nm处的共振光散射增强与DNA的浓度成线性关系 ,据此建立了用ERLS光谱测定痕量DNA的新方法 .方法的检出限在纳克级 .     

酸性红-CTMAB-TX体系与DNA作用的共振光散射光谱的研究及分析应用

研究了脱氧核糖核酸（DNA）与阴离子染料酸性红（FA）及阳离子表面活性剂溴化十六烷基三甲铵（CTMAB）和非离子型表面活性剂Triton X-100（TX）作用的共振光散射光谱的特征考察了各种影响因素，在优化条件下确立了共振光散射强度与鱼精DNA和小牛胸腺DNA以及变性后的鱼精DNA和小牛胸腺DNA浓度之间的关系，相应的线性范围分别为0.026-7．00mg／L；0．025-7.00mg／L；0．032-6．00mg／L；0．031-8．00mg／L，相关系数为0．9991；0.9996；09981；0.9996，检出限为7．0μg／L；6．0μg／L；11．0μg／L；12．5μg／L，基于共振光散射的增强，建立了一种测定DNA的新方法．图4，表3，参7．     

以六氨合钴(Ⅲ)为探针的DNA共振光散射分析

在pH为1.81～4.1的Britton-Robinson(BR)缓冲溶液中,[Co(NH3)6]3+与脱氧核糖核酸(DNA)相互作用并使其共振光散射强烈的增强.在342.0 nm处增强的共振光散射(RLS)强度与DNA的质量浓度在0.01～7.0 mg/L范围内呈良好的线性关系.据此建立了操作简便、灵敏度高的测定痕量DNA的新方法.该方法用于检测小牛胸腺DNA,检出限达到1.6μg/L级.     

丁基罗丹明B与DNA作用的共振光散射光谱及分析应用

研究了咕吨类染料丁基罗丹明B(BRB)与DNA作用的共振光散射光谱.加入DNA后,在pH1.5～2.5的范围内,BRB在DNA分子表面发生长距离自组装,在400nm处产生了增强的共振光散射峰,其发光强度与DNA的浓度成线性关系,线性范围为5.8～2688ng·mL-1,检出限(3σ)为5.8ng·mL-1.考察了影响因素和最佳反应条件,建立了用共振光散射谱RLS测定纳克级DNA的新方法.     

孔雀石绿在核酸表面分子的长距组装及其共振光散射法测定脱氧核糖核酸

研究了在表面活性剂十六烷基三甲基溴化铵（CTMAB）的存在下孔雀石绿与DNA作用的共振光散射光谱。加入DNA后，在pH9.5-10.0范围内，400nm和482nm处出现增强的共振散射峰。考察了影响因素和最佳反应条件的选择，据此拟定了一种DNA的纳克级测定方法。此方法灵敏度高，干扰小，检测限低，实验结果令人满意。     

变色酸2R-溴化十六烷基三甲基铵-DNA的共振光散射光谱及分析应用

在pH9.65的Tris-HCl缓冲溶液中,阴离子主体小分子变色酸2R（CR）对阳离子表面活性剂溴化十六烷基三甲基铵（CTMAB）与DNA（包括fsDNAc、tDNA）的共振光散射光谱有协同增强作用。考察了共振光散射光谱的影响因素,在优化条件下共振光散射强度增加值（？I）与DNA浓度之间呈良好的关系,据此建立了一种测定DNA的新方法,该方法具有反应速度快（只须1 min）、稳定性好、灵敏度高等特点。对于fsDNAc、tDNA的线性范围分别为0.05-1.2 mg/L0、.05-2.0 mg/L,检出限分别为6.1 ng/mL6、.3 ng/mL。用于fsDNA合成样测定结果较好。     

富勒醇/镱(Ⅲ)体系共振光散射法测定核酸

基于核酸对富勒醇/镱Ⅲ体系共振光散射强度的增强作用,建立了一种新的测定核酸的分析方法.富勒醇的水溶液表现出弱的共振光散射性质,但是当三价镱离子存在时,它的共振光散射强度显著增强,形成了一种稳定的富勒醇/镱Ⅲ共振光散射体系.鱼精DNA的加入使得该体系的共振光散射强度进一步增强.在优化条件下,0 -20.0μg/mL浓度范围内,共振光散射强度的增强值与鱼精DNA的浓度呈线性关系,检出限可达13.3 ng/mL.该法用于合成样品的分析,结果令人满意.     

水-有机两相体系长链烯烃氢甲酰化反应研究--阳离子表面活性剂结构的影响

合成了四种季铵盐型阳离子表面活性剂C22H45N（CH3）2C2H5Br(二十二烷基乙基二甲基溴化铵)，C22H45N(CH3)2C4H9Br(二十二烷基丁基二甲基溴化铵)，C22H45N(CH3)2C8H17Br(二十二烷基辛基二甲基溴化铵)，C22H45N(CH3)2C12H25Br(二十二烷基十二烷基二甲基溴化铵)，并考察了其对Rh-TPPTS[TPPTS：P(m—C6H4SO3Na)3]催化的水—有机两相长链烯烃氢甲酰化反应性能的影响．研究结果表明，在该体系中添加含有疏水长链的阳离子表面活性剂后，反应性能得到明显改善．     

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.     

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.     

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.