A Novel Method for Fabrication of a Glass-Electrode-Based Lipase Sensor

Lipase is one of the hydrolases. It catalyzes the hydrolysis of triglycerides, liberating fat acids. Based on its catalysis and the response of a glass electrode to the acids, a glass-electrode-based lipase sensor can be fabricated1, which has great potential in clinical medicine for the detection of blood fat in human serum samples.The immobilization of lipase on the bulb of a glass electrode is the key to the development of the sensor. In addition to its response time, which has a lot to do …     

三核铁甲酸簇合物[Fe_3(μ_3-O)(μ-O_2CH)_6(H_2O)_2(O_2CH)]·2H_2O在乙炔、水汽体系中的反应行为

本文研究了[Fe_3(μ_3-O)(μ-O_2CH)_6(H_2O)_2(O_2CH)]·2H_2O(简称)在乙炔、水汽体系中的反应行为。发现当温度高于220℃,脱落部分配体的具有活化乙炔进行加成反应的性能。采用原位红外光谱法和气相色谱法对此反应过程进行了跟踪探索,报道了产物的定性及半定量结果。     

一类数学生物经济模型的周期性

利用重合度理论中的延拓定理研究了一类非自治的数学生物经济模型的正周期解的存在性，得到了保证周期解存在的充分性判据．     

A critical evaluation of numerical solutions to the ‘Benchmark’ surface-flaw problem

Recent precise, elastic numerical solutions to a surface flaw in a plate under remote tension and bending have been compared to arrive at a ‘best estimate’ of the stress-intensity-factor variation along the flaw border. The geometry of the semielliptical surface flaw examined had a depth to length ratio of 0.25 (a/2c=0.25) and 25- and 75-percent relative crack depths (a/t=0.25, 0.75). The analysis methods used to determine the solutions included: Schwarz alternating technique, finite-element method and boundary-integral-equation method. The derived best-estimate curve for the stress-intensity factor is believed within 3 percent of the actual value along the crack front. The best-estimate curve compared well with scarce experimental data (±10 percent). The difference between the best-estimate curve and experiment is thought largely due to differences in geometry and Poisson's ratio.     

The Besicovitch–Federer projection theorem is false in every infinite-dimensional Banach space

The theme of the article is the study of the unipotent part of Arthur’s trace formula for general linear groups. The case of regular (or “regular by blocks”) unipotent orbits has been treated in another paper (cf. [10]). Here we are interested in the contribution of Richardson orbits that are induced by Levi subgroups with two-by-two distinct blocks. In this case, the contribution is remarkably given by a global unipotent weighted orbital integral. As a corollary, we get integral formulas for some of Arthur’s global coefficients. We also present a new construction of Arthur’s local unipotent weighted orbital integral and an explicit computation of some of them.     

From micelle supramolecular assemblies in selective solvents to isoporous membranes

The supramolecular assembly of PS-b-P4VP copolymer micelles induced by selective solvent mixtures was used to manufacture isoporous membranes. Micelle order in solution was confirmed by cryo-scanning electron microscopy in casting solutions, leading to ordered pore morphology. When dioxane, a solvent that interacts poorly with the micelle corona, was added to the solution, polymer-polymer segment contact was preferential, increasing the intermicelle contact. Immersion in water gave rise to asymmetric porous membranes with exceptional pore uniformity and high porosity. The introduction of a small number of carbon nanotubes to the casting solution improved the membrane stability and the reversibility of the gate response in the presence of different pH values.     

Synthesis and bioactivity of novel coumarin derivatives containing(E)-methyl 2-(methoxyimino)-2-phenylacetates

Ten coumarin derivatives containing(E)-methyl 2-(methoxyimino)-2-phenylacetate were synthesized and bioassayed.The compounds were identified by IR,~1H NMR and elemental analyses.The test results indicated that compound 5j(R~1 is methyl and R~2 is n-C_6H_(13)) was the optimal structure in this paper with good fungicidal activity against CDM(85%) at 6.25 mg/L concentration.     

Recent progress in the application of microfluidic systems and gold nanoparticles in immunoassays

Immunoassays are useful for many bioassays. Many new techniques and materials are introduced into the immunoassay to improve the efficiency. This paper reviews recent progress in the application of microfluidic systems and gold nanoparticles in immunoassay. The micro/nano technologies and materials can offer good sensitivity, fast detection, cost-effectiveness and easy signal readout. In particular, the miniaturization of microfluidics and colorimetric assays based on gold nanoparticles have dramatically im...     

Two-dimensional like conjugated copolymers for high efficiency bulk-heterojunction solar cell application:Band gap and energy level engineering

Three two-dimensional like conjugated copolymers PFSDCN,PFSDTA and PFSDCNIO,which consist of alternating fluorene and triphenylamine main chain,and different pendant acceptor groups (malononitrile,1,3-diethtyl-2-thiobarbituric acid and 2-(1,2-dihydro-1-oxoinden-3-ylidene)malononitrile) with thiophene as π-bridge,have been designed,synthesized and characterized.The structure-property relationships of the two-dimensional like conjugated copolymers were systematically investigated.The absorption spectra,band g...     

动力和盐度影响下长江口近岸沉积物中汞的再悬浮行为

利用PES(particle entrainment simulator)装置, 实验测定了不同的扰动强度和盐度条件下长江口近岸沉积物中Hg的再悬浮迁移和释放过程. 在盐度再悬浮试验中, 上覆水中HgD(溶解态Hg)和HgP(颗粒态Hg)含量分别在0.06~0.176 μg/L和0.033~0.723 μg/g之间变化, 在盐度×动力耦合再悬浮试验中, 上覆水中HgD和HgP含量分别在0.024~0.112 μg/L和0.05~0.958 μg/g之间变化. 在盐度较低(< 1‰)的水环境中, 动力条件是影响上覆水中Hg行为的重要因子, 动力条件改变后, 沉积物中的部分HgD和HgP存在短期释放行为, 但随扰动时间延长, 被扰动起来的悬浮颗粒对上覆水中的Hg起了较强的吸附作用. 当盐度在1‰以上时, 上覆水中的HgP出现解吸行为, 动力条件的耦合影响促进了Hg的解吸作用, 当动力条件达到250 r/min以上时, Hg的解吸作用增强, 上覆水中的HgD出现正通量, 表现为向上覆水的释放. 此外, 在较强动力条件下, 孔隙水中大量HgD的扩散释放也增加了其释放通量.