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Food and Nutrition Sciences 2018年第5期9卷 447-463页

作者： zhengkai xue Wenwu Zheng School of White Liquor Luzhou Vocational and Technical College Luzhou China Department of Cardiology The Affiliated Hospital of Southwest Medical University Luzhou China

Hexanoic acid (HX) is a crucial flavor compound and precursor of ethyl caproate (EA), which determines the quality of Chinese Luzhou-flavor liquor (CLFL). The isolation, purification, identification, and optimization of fermentation conditions of HX-producing bacteria are essential for industrial CLFL production. In this study, one strain of HX-producing bacterium was isolated from six candidate bacterial strains and identified as Clostridium sartagoneforme. Then, the growth characteristics and HX production of C. sartagoneforme were investigated. Sodium acetate medium was identified as the optimal fermentation medium from four candidate media. C. sartagoneforme yielded 800.85 ± 12.87 mg/100mL HX in sodium acetate medium. Then, to further optimize the formula of the fermentation medium, the carbon and nitrogen sources and inorganic salt component of the fermentation medium were investigated using HX yields as an optimization index. Optimization was performed with a single-factor experiment and the Taguchi design method. The single-factor experiment showed that the highest HX outputs were obtained when the sodium acetate medium contained 2.5 g/L yeast extract, 1.8 g/L KCl, 20 g/L sodium acetate, 15 mL/L ethanol, and 1.5 g/L glucose. In the orthogonal experiment designed using the Taguchi design method, HX yields reached 2018.29 ± 46.37 mg/100mL in sodium acetate medium that contained 3.5 g/L yeast extract, 1.8 g/L KCl, 25 g/L sodium acetate, and 15 mL/L ethanol.

关键词： Isolation Identification Hexanoic Acid-Producing Strain Fermentation Medium Optimization

基于重组HepG_2-P4503A4与HepG_2-P4503A46全细胞体外药物代谢比较研究

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四川动物 2014年第2期33卷 210-215页

作者：薛正楷罗祎魏泓泸州职业技术学院酿酒与生物医学工程研究所四川泸州646005 重庆医科大学附属第一医院妇产科重庆400016 第三军医大学实验动物中心重庆400038

本研究以探针药物硝苯地平（NF）、睾酮（TST）及其抑制剂酮康唑（KCZ）与重组HepG2-P4503A4、HepG2-P4503A46细胞全细胞在优化的重组细胞浓度、药物浓度、孵育时间等条件下进行体外孵育，通过高效液相色谱仪检测其药物代谢（抑制）动... 详细信息

本研究以探针药物硝苯地平（NF）、睾酮（TST）及其抑制剂酮康唑（KCZ）与重组HepG2-P4503A4、HepG2-P4503A46细胞全细胞在优化的重组细胞浓度、药物浓度、孵育时间等条件下进行体外孵育，通过高效液相色谱仪检测其药物代谢（抑制）动力学参数，并将二者进行比较分析。重组HepG2-P4503A46与HepG2-P4503A4细胞的硝苯地平、睾酮的代谢活性无显著差异（P＞0.05）；在0～10 μM的浓度范围内，酮康唑对硝苯地平和睾酮的抑制活性均随酮康唑浓度的增加而增加，且其IC50值均低于1 μM，为nM级，表明酮康唑对二者的硝苯地平代谢具有较强的抑制活性，抑制剂酮康唑对重组HepG2-P4503A46与HepG2-P4503A4细胞的抑制活性差异不显著（P＞0.05）。本研究表明无论是底物代谢或底物抑制活性，重组HepG2-P4503A46细胞均与重组HepG2-P4503A4细胞差异不显著，P4503A46可能为巴马小型猪体内人P4503A4的同源酶。

关键词：细胞色素P4503A4 细胞色素P4503A46 全细胞药物代谢

Character Sheaves for Classical Graded Lie Algebras

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Acta Mathematica Sinica,English Series 2024年第3期40卷 870-884页

作者： Ting xue School of Mathematics and Statistics University of MelbourneVIC 3010Australia Department of Mathematics and Statistics University of HelsinkiHelsinki 00014Finland

In this note we study character sheaves for graded Lie algebras arising from inner automorphisms of special linear groups and Vinberg’s type Ⅱ classical graded Lie algebras.

关键词： Graded Lie algebras character sheaves Fourier transform nilpotent orbits

Mechanical property of cylindrical sandwich shell with gradient core of entangled wire mesh

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Defence Technology（防务技术） 2024年第1期31卷 510-522页

作者： Xin xue Chao Zheng Fu-qiang Lai xue-qian Wu Institute of Metal-rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116China Fujian Metallurgical Industry Design Institute Fuzhou350116China

To explore the wide-frequency damping and vibration-attenuation performances in the application of aerospace components,the cylindrical sandwich shell structure with a gradient core of entangled wire mesh was proposed in this ***,the gradient cores of entangled wire mesh in the axial and radial directions were prepared by using an in-house Numerical Control weaving machine,and the metallurgical connection between skin sheets and the gradient core was performed using vacuum ***,to investigate the mechanical properties of cylindrical sandwich shells with axial or radial gradient cores,quasi-static and dynamic mechanical experiments were carried *** primary evaluations of mechanical properties include secant stiffness,natural frequency,Specific Energy Absorption(SEA),vibration acceleration level,and so *** results suggest that the vibration-attenuation performance of the sandwich shell is remarkable when the high-density core layer is at the end of the shell or abuts the inner *** axial gradient material has almost no influence on the vibration frequencies of the shell,whereas the vibration frequencies increase dramatically when the high-density core layer approaches the ***,compared to the conventional sandwich shells,the proposed functional grading cylindrical sandwich shell exhibits more potential in mass reduction,stiffness designing,and energy dissipation.

关键词： Entangled wire mesh Gradient cylindrical sandwich shell Vacuum brazing Secant stiffness Damping

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一株窖泥己酸菌株的多相鉴定及产酸研究

酿酒科技 2016年第6期 65-71页

作者：薛正楷薛原泸州职业技术学院白酒学院四川泸州646005 泸州市生物医学工程研究所四川泸州646005 同济大学理学院化学系上海200016

采用常规形态、生理生化指标,并结合16s RNA基因序列分析进行多相鉴定方法及气相色谱分析技术,对分离自泸州老窖180年窖池的1株产己酸菌株(K-2)进行分类鉴定和代谢产物分析,结果表明,K-2菌株能利用D-葡萄糖、甘露醇、菊糖、L-阿拉伯糖... 详细信息

采用常规形态、生理生化指标,并结合16s RNA基因序列分析进行多相鉴定方法及气相色谱分析技术,对分离自泸州老窖180年窖池的1株产己酸菌株(K-2)进行分类鉴定和代谢产物分析,结果表明,K-2菌株能利用D-葡萄糖、甘露醇、菊糖、L-阿拉伯糖、D-蔗糖等多种碳源,具有脲酶、七叶灵和明胶酶水解活性;K-2菌株16s RNA基因序列(1346bp)与Clostridium celerecrescens一致率为99%,Strain K-2 16s RNA基因序列在系统进化树中位于Clostridium属分支,与Clostridium celerecrescens序列相似性最近,本研究将其鉴定为梭菌属(Genus I Clostridium)中的Clostridium celerecrescens菌株,该菌株有高效的产己酸(547.26 mg/100 m L)和丁酸能力(382.45 mg/100 m L)能力,但几乎不产己酸乙酯和丁酸乙酯。此研究为国内外首次报道从浓香型白酒窖池窖泥中分离出Clostridium celerecrescens菌株,且具有高效的产己酸特性。

关键词：窖泥己酸菌浓香型白酒多相鉴定

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一株整合型高抗性高效发酵己酸菌的选育研究

中国酿造 2020年第8期39卷 143-150页

作者：薛正楷郑文武张宿义泸州职业技术学院白酒学院四川泸州646001 泸州市生物医学工程研究所四川泸州646000 西南医科大学附属医院四川泸州646001 泸州老窖股份有限责任公司四川泸州646002

该试验采用同源重组技术从产己酸菌-纺锤形赖氨酸芽孢杆菌(Lysinibacillus fusiformis)基因组中敲出α-淀粉酶基因、蔗糖磷酸化酶基因,同时敲进SigA和SigB基因,以提高***的抗性,选育高效发酵己酸菌。结果表明,SigA和SigB双整合菌株SigA-... 详细信息

该试验采用同源重组技术从产己酸菌-纺锤形赖氨酸芽孢杆菌(Lysinibacillus fusiformis)基因组中敲出α-淀粉酶基因、蔗糖磷酸化酶基因,同时敲进SigA和SigB基因,以提高***的抗性,选育高效发酵己酸菌。结果表明,SigA和SigB双整合菌株SigA-SigB4在pH 4、乙醇体积分数6%条件下,己酸产量达到360.86 mg/100 mL,比单整合菌株SigB3提高了1.17倍,比非重组出发株***提高了8.97倍,且经过32代传代后,其高效产己酸效能无显著变化(P>0.05)。

关键词：整合型产己酸菌选育发酵

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高酸发酵液的发酵条件优化研究

酿酒科技 2016年第12期 24-27页

作者：薛正楷泸州职业技术学院四川泸州646001 泸州市生物医学工程研究所四川泸州646001 泸州森普裕隆生物科技有限公司四川泸州646002

为了获得浓香型白酒的高己酸和高总酸发酵液,本研究采用均匀实验设计和多因子及互作项回归方法,对高酸发酵液的发酵配方和温度进行优化。结果表明,实验数据与所得回归方程具有显著的拟合度(P<0.01),从数学模型和验证实验得到的最优配方... 详细信息

为了获得浓香型白酒的高己酸和高总酸发酵液,本研究采用均匀实验设计和多因子及互作项回归方法,对高酸发酵液的发酵配方和温度进行优化。结果表明,实验数据与所得回归方程具有显著的拟合度(P<0.01),从数学模型和验证实验得到的最优配方及温度组合为:葡萄糖120 g/L、酵母膏19 g/L、MgCl_2 1 g/L、乙酸钠27.5 g/L、K_2HPO_4 1 g/L,28℃。

关键词：高酸发酵液优化发酵条件白酒

Doubled Hecke Algebras and Related Quantum Schur Duality

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Algebra Colloquium 2024年第3期31卷 417-428页

作者： Chenliang xue An Zhang School of Mathematical Sciences East China Normal University Shanghai 200241China

introduce the doubled Hecke algebra,which is an infinite-dimensional algebra generated by two Hecke *** concept originates from the degenerate doubled Hecke algebra in the theory of Schur-Weyl duality related to enhanced reductive algebraic *** study the finite-dimensional natural representation of the doubled Hecke algebra on tensor space and prove that the doubled Hecke algebra forms a duality with the quantum group of Levi type.

关键词： quantum group doubled Hecke algebra quantum q-Schur duality double centralizer

Evolution of pore systems in low-maturity oil shales during thermal upgrading--Quantified by dynamic SEM and machine learning

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Petroleum Science 2024年第3期21卷 1739-1750页

作者： Jun Liu xue Bai Derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChina International Quantum Academy Shenzhen518048GuangdongChina Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055GuangdongChina Department of Energy and Mineral Engineering Pennsylvania State University ParkPA 16802USA

In-situ upgrading by heating is feasible for low-maturity shale oil,where the pore space dynamically *** characterize this response for a heated substrate concurrently imaged by *** systematically follow the evolution of pore quantity,size(length,width and cross-sectional area),orientation,shape(aspect ratio,roundness and solidity)and their anisotropy—interpreted by machine *** indicate that heating generates new pores in both organic matter and inorganic ***,the newly formed pores are smaller than the original pores and thus reduce average lengths and widths of the bedding-parallel pore ***,the average pore lengths and widths are increased in the bedding-perpendicular ***,heating increases the cross-sectional area of pores in low-maturity oil shales,where this growth tendency fluctuates at300℃.In addition,the orientation and shape of the newly-formed heating-induced pores follow the habit of the original pores and follow the initial probability distributions of pore orientation and ***,limited anisotropy is detected in pore direction and shape,indicating similar modes of evolution both bedding-parallel and *** propose a straightforward but robust model to describe evolution of pore system in low-maturity oil shales during heating.

关键词： Low-maturity oil shale Pore elongation Organic matter pyrolysis In-situthermal upgrading Scanning electron microscopy(SEM) Machine learning

Thermodynamic property of sandwich cylindrical shell structure with metallic wire mesh:Numerical modeling and experimental analysis

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Chinese Journal of Aeronautics 2024年第1期37卷 138-152页

作者： Xin xue Guojian SHEN Juan LIAO Institute of Metal Rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350116China Fujian Shuikou Power Generation Group Co. LTDFuzhou 350000China

As a new addition to lightweight composite structures,the sandwich cylindrical shell with a metallic wire mesh core has emerged as a promising solution for thermodynamic performance analysis at elevated *** intricate interwoven cellular formations within the metallic wire mesh pose difficulties for thermo-mechanical modeling and property ***,the constitutive models employed to characterize hysteresis phenomena were presented,comprising isotropic elasticity,Bergstrom-Boyce model,Ogden hyper-elasticity,and parameter identification through mechanical examinations at varying ***,the finite element modeling of cylindrical shell structures was determined for modal and steady-state dynamic ***,the experimental procedures were carried out,including the preparation of the sandwich cylindrical shell and the dynamic testing *** first-order natural frequency of the cylindrical shell structure is close to the resonance frequency of the dynamic test results,with a maximum error of 6.5%,demonstrating the accuracy of the simulation *** compared to the solid-core cylindrical shell,the average insertion loss of the sandwich cylindrical shell structure within the frequency range of 10–1000 Hz at room temperature is up to 11.09 ***,at elevated temperatures,the average insertion loss of the sandwich cylindrical shell decreases but fluctuates as the temperature changes.

关键词： Energy dissipation Metallic matrix composites Numerical analysis Sandwich structure Thermodynamic properties