三聚氰胺表面分子印迹聚合物制备与印迹原理模拟

以硅烷偶联剂KH570为媒介,将功能大分子聚丙烯酸(PAA)接枝到硅胶微粒表面,形成了接枝微粒.然后以三聚氰胺为模板分子,乙二胺为交联剂,合成了对三聚氰胺具有较好选择性的表面分子印迹聚合物MIP-PAA/SiO2.以间苯二胺为对比物,采用静态与动态2种方法研究了MIP-PAA/SiO2对三聚氰胺的结合性能与分子识别特性.同时,在B3LYP/6-31G(d,p)水平上通过计算三聚氰胺及间苯二胺与功能单体作用的稳定化能,并在同等水平上进行氢键相关自然建轨道分析与电子密度拓扑分析,以进一步说明印迹聚合物对印迹分子高选择性的原因.     

三聚氰胺表面分子印迹聚合物制备与印迹原理模拟

以硅烷偶联剂KH570为媒介,将功能大分子聚丙烯酸(PAA)接枝到硅胶微粒表面,形成了接枝微粒.然后以三聚氰胺为模板分子,乙二胺为交联剂,合成了对三聚氰胺具有较好选择性的表面分子印迹聚合物MIP-PAA/SiO2.以间苯二胺为对比物,采用静态与动态2种方法研究了MIP-PAA/SiO2对三聚氰胺的结合性能与分子识别特性.同时,在B3LYP/6-31G(d,p)水平上通过计算三聚氰胺及间苯二胺与功能单体作用的稳定化能,并在同等水平上进行氢键相关自然建轨道分析与电子密度拓扑分析,以进一步说明印迹聚合物对印迹分子高选择性的原因.     

三聚氰胺分子印迹聚合物的合成与识别机理研究

为了制备三聚氰胺分子印迹聚合物用于分离富集等目的,以三聚氰胺为模板分子,优化选择溶剂和致孔剂为甲醇,功能单体为丙烯酰胺,采用沉淀聚合法和本体聚合法制备对应的MIP和NIP,沉淀聚合法的MIP与NIP平均产率分别为57.48%和58.85%,本体聚合法的MIP与NIP分别为91.35%和92.71%.从制备分子印迹聚合物的操作过程简便性考虑,沉淀聚合法为较优的合成方法.三聚氰胺与功能单体的结合实验表明:三聚氰胺与丙烯酰胺之间主要以氢键形成1∶3型结合物,产生特异性的选择性分子识别,结合常数K达到4.93×105,表明分子印迹聚合物结构稳定.     

SBA-15表面S-naproxen分子印迹聚合物微球的合成与分子识别特性

以手性药物左旋萘普生(S-naproxen)为模板分子,四乙烯基吡啶(4-VPy)为功能单体,采用表面印迹法,以介孔材料SBA-15为载体合成了能选择性识别S-naproxen的分子印迹聚合物微球.扫描电镜及孔结构分析结果表明,所合成的分子印迹聚合物微球具有粒径均匀、孔径分布窄、比表面积大等特点;同时扫描电镜、X射线衍射和红外光谱分析结果表明载体表面形成了分子印迹聚合物层,Scatchard分析表明分子印迹聚合物在自组装过程中存在两类结合位点,聚合物高亲和力和低亲和力结合位点的最大表观结合容量分别为Qmax1=2.504μmol/g,Qmax2=16.680μtmol/g;分子印迹聚合物的热力学研究表明,吸附过程可以自发进行.     

敌百虫分子印迹聚合物的合成及其性能

采用分子印迹技术,以壳聚糖为聚合物基体.敌百虫为模板分子,制备在空间结构和结合位点上与敌百虫匹配的分子印迹聚合物.研究该聚合物的合成条件,包括壳聚糖与敌百虫的作用力.以及交联、洗脱条件.测定分子印迹聚合物对敌百虫的吸附和选择识别能力,并对其结构进行表征.结果表明,所合成的分子印迹聚合物对敌百虫具有良好的吸附和选择识别能力,其中对结构类似的氧化乐果的分离系数达到3.57.     

间苯二酚分子印迹聚合物的合成及其吸附性能研究

以间苯二酚为模板分子,4-乙烯基吡啶(4-VP)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,采用沉淀聚合法合成分子印迹聚合物.通过静态平衡吸附实验和选择性实验考察了印迹聚合物的吸附性能和选择性,采用Scatchard模型研究了印迹聚合物的结合特性,并考察了印迹聚合物对同类底物吸附特异性.结果显示,该印迹聚合物对间苯二酚呈现出良好的吸附能力和选择性.     

帕珠沙星分子印迹聚合物结合特性

采用甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成了具有高选择性的L-帕珠沙星分子印迹聚合物.印迹聚合物对模板分子的结合量明显高于空白聚合物.通过Scatchard分析研究了聚合物的选择结合性能,结果表明:分子印迹聚合物在识别帕珠沙星分子的过程中存在两类结合位点;用多点结合模型进行计算得到高亲和力的结合位点的离解常数Kd,1和最大表观结合常数Qmax,1分别为23.08 μmol/L和3.65 μmol/g,低亲和力的结合位点的离解常数Kd,2和最大表观结合常数Qmax,2分别为0.43 mmol/L和27.28 μmol/g.实验表明,分子印迹聚合物对模板分子的结合量高于其他类似物,呈现出空白聚合物没有的高选择性.     

罗丹明6G分子印迹聚合物的合成与性能研究

采用分子印迹技术,以丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成出以罗丹明6G为模板的分子印迹聚合物.利用静态平衡结合法和Scatchard分析法研究了此印迹聚合物的结合能力和选择性.结果表明,以丙烯酰胺为功能单体的印迹聚合物中形成了两类不同的结合位点,计算了离解常数分别为7.64ⅹ10-4moL/L和4.35ⅹ10-3moL/L.对比罗丹明S和罗丹明B的结合特性,该印迹聚合物呈现了较好的选择性.     

三丁基锡分子印迹聚合物的合成及吸附性能的研究

以壳聚糖为功能单体,以三丁基锡(TBT)为烙印分子,制备了在空间结构和结合位点上与TBT完全匹配的TBT模板交联壳聚糖分子印迹聚合物.研究了此聚合物的吸附、交联和洗脱条件,以及对TBT的选择性吸附能力.结果表明,所合成的TBT分子印迹聚合物对TBT具有良好的吸附选择性.     

农药三唑酮分子印迹聚合物的识别特性研究

采用分子印迹技术合成了对农药三唑酮有高选择性的印迹聚合物,通过Scatchard分析研究了印迹聚合物的结构特性.结果表明,以甲基丙烯酸为功能单体的印迹聚合物,通过氢键作用可以形成两类结合位点.用多点结合模型计算两类结合位点的离解常数分别为K1=7.89×10-4mol/L,K2=3.53×10-3mol/L.底物的选择性结合实验表明,该聚合物对三唑酮呈现高度的选择性及识别能力.为在生物样品中选择富集三唑酮提供了可能性.     

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.