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一株毛霉属真菌Mucor hiemalis发酵液的化学成分研究

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广州化工 2024年第11期52卷 33-35,62页

作者：肖扬熊财智杨钰钦曹金凤刘世巍丁建海宁夏师范学院化学化工学院宁夏固原756000

研究一株毛霉属真菌Mucor hiemalis发酵液的化学成分。运用ITS序列分析法进行分子生物学鉴定,并使用MEGA7.0软件构建NJ(Neighbor-Joining)系统发育进化树,最终鉴定该菌株为Mucor hiemalis。利用正相硅胶、Sephadex LH-20凝胶柱层析进行... 详细信息

研究一株毛霉属真菌Mucor hiemalis发酵液的化学成分。运用ITS序列分析法进行分子生物学鉴定,并使用MEGA7.0软件构建NJ(Neighbor-Joining)系统发育进化树,最终鉴定该菌株为Mucor hiemalis。利用正相硅胶、Sephadex LH-20凝胶柱层析进行分离纯化,通过核磁共振波谱和高分辨质谱等技术进行结构鉴定。从Mucor hiemalis发酵液中分离鉴定了6个化合物,分别为油酸(1),2-甲氧基乙基乙酸酯(2),邻苯二甲酸二丁酯(3),(22E,24R)-5α,8α-过氧麦角甾-6,22-二烯-3β-醇(4),亚油酸甘油三酯(5)和2,3-丁二醇(6)。以上所有化合物均首次从该菌中分离得到。其中,(22E,24R)-5α,8α-过氧麦角甾-6,22-二烯-3β-醇(4)是一种甾体类化合物,对细胞炎症表现出显著的抗炎活性,这将对该菌株后期的综合利用与开发提供了一定理论基础。

关键词：毛霉属液体发酵分离结构鉴定化学成分

Universal Encapsulation Adhesive for Lead Sedimentation and Attachable Perovskite Solar Cells with Enhanced Performance

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Energy & Environmental Materials 2024年第3期7卷 303-310页

作者： Xuehao Zhu Haoyu cai Cong Bai Zhengzhe Wu Wenjian Shen Yiming xiong Juan Zhao Fuzhi Huang Yibing Cheng Jie Zhong Research Centre for Advanced Thin Film Photovoltaics State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216China School of Automobile Engineering Wuhan University of TechnologyWuhan 430070China

In this work,a modified polyurethane adhesive(PUA)was prepared to realize a convenient encapsulation strategy for lead sedimentation and attachable perovskite solar cells(A-PSCs).The modified PUA can completely self-heal within 45 min at room temperature with an efficient lead ion-blocking rate of 99.3%.The PUA film can be coated on a metal electrode with slight efficiency improvement from 23.96%to 24.15%.The thermal stability at 65℃and the humidity stability at 55%relative humidity(RH)are superior to the devices encapsulated with *** PUA film has strong adhesion to the flexible substrate and the initial efficiency of the flexible perovskite module(17.2%)encapsulated by PUA remains 92.6%within 1825 *** results suggest that PUA encapsulation is universal for rigid and flexible PSCs with enhanced stability and low lead ***,it was found that flexible PSCs can be well attached to various substrates with PUA,providing a facile route for the A-PSCs in various scenarios without additional encapsulation and installation.

关键词： adhesive attachable device flexible module lead leakage polyurethane

Thioredoxin pathway regulated live-cell synthesis of CdSe quantum dots in Saccharomyces cerevisiae

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Science China Chemistry 2024年第11期67卷 3851-3860页

作者： Xu Li cai-Qin Wu Jia-Wei Tu Juan Kong Ling-Ling Yang Zhi-xiong Xie Dai-Wen Pang College of Chemistry and Molecular Sciences The Institute for Advanced Studies College of Life Sciences Wuhan University Research Center for Analytical Sciences College of Chemistry State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular Recognition Frontiers Science Center for New Organic Matter Frontiers Science Center for Cell Responses and Haihe Laboratory of Sustainable Chemical Transformations Nankai University

Currently, the application of synthetic biology to artificially manipulate and utilize organisms for the synthesis of desired products such as nanomaterials with excellent fluorescence properties is attracting considerable attention. However, it is still difficult to obtain designed products efficiently due to insufficient knowledge of the biosynthetic mechanisms. The thioredoxin（TRX） and glutathione（GSH） pathways are generally conserved thiol-reductase systems that protect organisms from oxidative stress and are involved in selenium（Se） metabolism. In this study, we revealed the pivotal role of cytoplasmic TRX pathway in regulating the metabolism of Na2SeO3during the live-cell synthesis of cadmium-selenium quantum dots（Cd Se QDs） in Saccharomyces cerevisiae by regulating the expression level of genes related to TRX pathway and measuring the intracellular content of selenocysteine（Se Cys）. The determination of Se Cys metabolism in yeast with GSH pathway-related genes deleted demonstrated that the TRX pathway played a more significant role in Se Cys metabolism than GSH pathway. A 6.4-fold enhancement in the synthetic yield of Cd Se QDs was achieved through the overexpression of TRX pathway-related genes,improvement of synthetic procedure, and supplementation of GSH based on the understanding of biological *** the mechanism of CdSe QDs live-cell synthesis facilitates the precise manipulation of biological processes for the synthesis of inorganic nanomaterials.

关键词： thioredoxin glutathione quantum dot live-cell synthesis selenium metabolism Saccharomyces cerevisiae

Exploring predictive markers for liver failure post-hepatectomy in hepatocellular carcinoma patients

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World Journal of Gastrointestinal Surgery 2024年第5期16卷 1482-1484页

作者： Shi-Yan Zhang xiong-Jian Ma Xue-Xia Zhu Na cai Department of Clinical Laboratory Fuding HospitalFujian University of Traditional Chinese MedicineFuding 355200Fujian ProvinceChina

This letter to the editor addresses the study titled“Predictive value of NLR,Fib4,and APRI in the occurrence of liver failure after hepatectomy in patients with hepatocellular carcinoma”by Kuang et al in the World Journal of Gastrointestinal *** study acknowledges the comprehensive patient data analysis while suggesting that there is a need for further discussion on the clinical applicability of these markers across diverse patient *** letter recommends prospective studies for validation and considers the influence of confounding *** finding underscores the significance of this study in improving hepatocellular carcinoma management.

关键词： Neutrophil-to-lymphocyte ratio Hepatocellular carcinoma Liver failure Hepatectomy Letter to the Editor Commentary

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高斯波包在截止波导中的传播

电子科技大学学报 2005年第6期34卷 774-777页

作者：陈安和熊彩东电子科技大学物理电子学院成都610054

分析了电磁波传播时的超光速群速。对高斯波包在分段填充不同介质的波导中的传播情况进行了数值模拟,得到高斯波包通过截止区的群速和能速,并对其中涉及到的“超光速”问题作了一定的分析。通过模拟得出,在一定的截止区长度范围内和一... 详细信息

分析了电磁波传播时的超光速群速。对高斯波包在分段填充不同介质的波导中的传播情况进行了数值模拟,得到高斯波包通过截止区的群速和能速,并对其中涉及到的“超光速”问题作了一定的分析。通过模拟得出,在一定的截止区长度范围内和一定工作频率范围内,群速超过光速;并得到,波包的能量传播速度(能速)始终不会超过光速。

关键词：异常传播数值模拟群速能速

High-resolution neutronics model for ^(238)Pu production in high-flux reactors

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Nuclear Science and Techniques 2024年第5期35卷 226-236页

作者： Qing-Quan Pan Qing-Fei Zhao Lian-Jie Wang Bang-Yang Xia Yun cai Jin-Biao xiong Xiao-Jing Liu School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610200China

We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux *** filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy *** burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme *** three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were *** neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.

关键词： ^(238)Pu Neutronics model High-flux reactor Spectrum resolution Spectrum optimization

The interaction mechanism between zein and folic acid in alkaline aqueous solutions:an experimental and molecular simulation study

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Food Quality and Safety 2024年第1期8卷 166-178页

作者： Jun Zhu Yiling Yao Yuying Liao Lala cai Wenqi Zhang Nuo Hong Wenlin Sun Chunhua xiong Lanying Yao School of Food Science and Biotechnology Zhejiang Gongshang UniversityHangzhouChina

Objectives:Folic acid is a vitamin that is not highly soluble in water and is sensitive to the ***,it is important to find suitable *** study aimed to exemplify the interaction of folic acid with zein in alkaline aqueous solutions and shed light on how zein can be used as a carrier for folic *** and Methods:Zein and folic acid were separately dissolved in NaOH solutions with a PH of *** solution and folic acid solution were combined in specific *** methods including multi-spectroscopy,dynamic light scattering,and electron microscopy combining with molecular dynamics simulations were used to study the interaction mechanism between zein and folic acid in alkaline aqueous ***:Fluorescence spectroscopy showed that the quenching of zein by folic acid was mainly static,and the main driving force behind this interaction was van der Waals forces and hydrogen *** formation of zein–folic acid complexes was confirmed by ultraviolet–visible spectroscopy,Fourier transform infrared spectroscopy,and circular dichroism *** results also showed that the structure of zein changed when it interacted with folic *** light scattering analysis revealed that the addition of folic acid caused proteins to *** aggregates of the complexes had an irregular shape and were large,as observed by scanning electron microscopy and transmission electron *** simulation was used to further investigate the interaction *** to these findings,the folic acid molecule interacted with zein in a shallow recess near the protein *** dominant forces at play in the zein–folic acid interaction were van der Waals forces and electrostatic forces,including hydrogen ***:The zein alkali-soluble system is very suitable for folic acid delivery.

关键词： Zein folic acid alkaline aqueous solutions molecular simulation interaction mechanism.

Cu^(2+)-Assisted Synthesis of Au@AgI Core/Shell Nanorods via In Situ Oxidation of Iodide:A Strategy for Colorimetric Iodide Sensing

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Journal of Analysis and Testing 2022年第4期6卷 374-381页

作者： Zhi-xiong cai Yu-Zhu Chen Benjamin Edem Meteku Qiao-Wen Zheng Fei-Ming Li Mao-Sheng Zhang Jing-Bin Zeng Xi Chen College of Chemistry and Environment Fujian Provincial Key Laboratory of Modern Analytical Science and Separation TechnologyMinnan Normal UniversityZhangzhou363000China College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao266580China Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis and Instrumentation College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China

Colorimetric nanoprobes are frequently employed to construct sensitive sensors via various *** this work,a novel strategy for simple and ultrasensitive sensing of iodide(I_(−))was constructed based on Cu^(2+)-assisted generation of Au@AgI core/shell nanorods(NRs),by etching silver-coated gold nanorods(Ag@Au NRs).Ag@Au NRs were first prepared and characterized with UV-visible spectroscopy,transmission electron microscopy,high-angle annular dark-field scanning transmission electron microscopy,and energy-dispersive X-ray spectroscopy before and after iodide *** mechanism of detection was based on the generation of AgI shells via etching Ag shells by I_(2),which was produced from the oxidation of I_(−)with Cu^(2+),resulting in the peak shift of localized surface plasmon resonance(LSPR)while the color changed from green,blue to *** red-shift of the longitudinal LSPR peak had a linear relationship with I_(−)concentration in the range of 0-50μmol/L with a correlation coefficient of ***,the proposed method was used for the quantitative detection of I_(−)in real samples and outstanding recoveries in the range of 91-106%with relative standard deviations lower than 2.5%were observed.

关键词： Colorimetry Core/shell nanorods Iodide sensing

Tracheal glomus tumor： two cases with bronchoscopic intervention

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Chinese Medical Journal 2014年第1期127卷 189-190页

作者： xiong Wei cai Cunliang Zhou Yunzhi Zhang Nan Wang Hongwu Department of Internal Oncology Meitan General Hospital Beijing100028 China

Glomus tumors are neoplasms derived from specialized cells of glomus bodies surrounding arteriovenous *** most of them are benign,aggressive cases have been *** tumors can be found throughout the body but are most highly concentrated in the digits,palms,and soles of the *** is rare in lung and trachea and the optimal therapy has not been thoroughly described.

关键词： glomus tumor bronchoscopy