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金属铜配合物催化氧化1-(3,4-二甲氧基苯)乙醇的动力学研究 总被引:3,自引:0,他引:3
合成了1-(3,4-二甲氧基苯)乙醇(DMPE)作为木质素模型物,并用初始速率法研究了40℃时在pH6.5~8.5磷酸缓冲溶液中N,N-双(2-乙基-5-甲基-咪唑-4-亚甲基)乙醇胺合铜、N,N-双(2-(2-羟乙基胺基)乙基)草酰胺合铜和5,7,12,14-四甲基-1,4,8,11-四氮杂环十四-4,7,11,14-四烯合铜催化氧化1-(3,4-二甲氧基苯)乙醇的动力学,提出了1-(3,4-二甲氧基苯)乙醇氧化反应动力学模型,并由此计算出不同pH值条件下催化反应动力学参数k2和Km.铜配合物的催化活性随着pH的增大而增大.具有大共轭体系的配体催化剂表现出更好的催化活性.提出并讨论了H2O2氧化DMPE的催化氧化反应机理. 相似文献
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运用分担值的思想证明了涉及极点重数的亚纯函数族的正规定则,所得结论推广了相关文献的主要结果. 相似文献
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Qianqian Ji Weipeng Zhang Qiuying Lu Xiaodong Li 《Journal of Nonlinear Modeling and Analysis》2020,2(1):25-44
In this work, bifurcation analysis near double homoclinic loops with Ws inclination ?ip of Γ1 and nonresonant eigenvalues is presented in a four-dimensional system. We establish a Poincar´e map by constructing local active coordinates approach in some tubular neighborhood of unperturbed double homoclinic loops. Through studying the bifurcation equations, we obtain the condition that the original double homoclinic loops are persistent, and get the existence or the nonexistence regions of the large 1-homoclinic orbit and the large 1-periodic orbit. At last, an analytical example is given to illustrate our main results. 相似文献
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Fangwei Ding Prof. Debin Xia Weipeng Sun Wei Chen Prof. Yulin Yang Prof. Kaifeng Lin Prof. Feibao Zhang Prof. Xugang Guo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(66):15106-15111
A series of novel sulfur-containing bent N-heteroacenes were constructed and characterized by NMR and UV/Vis spectroscopy, cyclic voltammetry, and single-crystal X-ray diffraction. By introducing sulfur-containing groups (thio, sulfinyl, and sulfonyl) into bent azaacenes, their electronic delocalization was improved and frontier energy levels were modulated. The target products displayed tunable optical and electronic properties through altering the valence of sulfur and fused length of the azaacenes. For the first time, typical products were utilized as organic field effect transistor materials, affording promising results. 相似文献
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Adapter-ligation-mediated allele-specific amplification (ALM-ASA) is a potential method for multiplex SNPs typing at an ultra low cost. Here, we describe a kind of software, which designs allele-specific primers for ALM-ASA assay on multiplex SNPs. DNA sequences containing SNPs of interest are submitted into the software which contains various endonucleases for options. Based on the SNP sequence information and the selected endonucleases, the software is capable of automatically generating sets of information needed to perform genotyping experiments. Each set contains a suitable endonuclease, qualified allele-specific primers with orientations and melting temperatures, sizes of allele-specific amplicons, and gel electropherograms simulated according to the sizes of the allele-specific amplicons and the mobility of DNA fragments in 2% agarose gel. Seven SNPs in the arylamines N-acetyltransferase 2 (NAT2) gene, five SNPs in the BRCA1 gene, five SNPs in the COMT gene, six SNPs in the CYP2E1 gene, five SNPs in the MPO gene, and six SNPs in the NRG1 gene were selected for evaluating the software. Without extra optimization, seven SNPs in the NAT2 gene were successfully genotyped for genomic DNA samples from 127 individuals by using the first set of allele-specific primers yielded by the software. Although several steps are used in the ALM-ASA assay, the whole genotyping process can be completed within 3 h by optimizing each step. Profiting from the software, the ALM-ASA assay is easy-to-perform, labor-saving, and accurate. 相似文献
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Yu Zhao Jiaying Yang Danli Hao Ran Xie Lingyu Jia Miyi Yang Hai Ma Pengqian Wang Weipeng Yang Feng Sui Haiyu Zhao Yanjun Chen Qinghe Zhao 《Macromolecular bioscience》2023,23(2):2200430
Methicillin-resistant Staphylococcus aureus (MRSA) can induce multiple inflammations. The biofilm formed by MRSA is resistant to a variety of antibiotics and is extremely difficult to cure, which seriously threatens human health. Herein, a nanoparticle encapsulating berberine with polypyrrole core and pH-sensitive shell to provide chemo-photothermal dual therapy for MRSA infection is reported. By integrating photothermal agent polypyrrole, berberine, acid-degradable crosslinker, and acid-induced charge reversal polymer, the nanoparticle exhibited highly efficient MRSA infection treatment. In normal uninfected areas and bloodstream, nanoparticles showed negatively charged, demonstrating high biocompatibility and excellent hemocompatibility. However, once arriving at the MRSA infection site, the nanoparticle can penetrate and accumulate in the biofilm within 2 h. Simultaneously, berberine can be released into biofilm rapidly. Under the combined effect of photothermal response and berberine inhibition, 88.7% of the biofilm is removed at 1000 µg mL−1. Moreover, the nanoparticles have an excellent inhibitory effect on biofilm formation, the biofilm inhibition capacity can reach up to 90.3%. Taken together, this pH-tunable nanoparticle can be employed as a new generation treatment strategy to fight against the fast-growing MRSA infection. 相似文献