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The release and catabolism of ferulic acid in plant cell wall by rumen microbes:A review

Animal Nutrition 2022年第2期9卷 335-344页

作者： Yan-Lu Wang Wei-Kang Wang qi-chao wu Hong-Jian Yang State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

Ferulic acid(FA)is one of the most abundant hydroxycinnamic acids in the plant world,especially in the cell wall of grain bran,in comparison with forage and crop *** studies noted that FA was mainly linked with arabinoxylans and lignin in plant cell walls in ester and ether covalent *** forages were ingested by ruminant animals or encountered rumen microbial fermentation in vitro,these cross-linkages form physical and chemical barriers to protect cell-wall carbohydrates from microbial attack and enzymatic ***,increasing studies noted that FA presented some toxic effect on microbial growth in the *** recent decades,many studies have addressed the relationships of ester and/or ether-linked FA with rumen nutrient digestibility,and there is still some controversy whether these linkages could be used as a predicator of forage digestibility in *** authors in this review summarized the possible relationships between ester and/or ether-linked FA and fiber digestion in *** microbes,especially bacteria and fungi,were found capable of breaking down the ester linkages within plant cell walls by secreting feruloyl and p-coumaroyl esterase,resulting in the release of free FA and improvement of cell wall *** increasing evidence noted that these esterases secreted by rumen microbes presented synergistic effects with xylanase and cellulase to effectively hydrolyze forage cell *** released FA were absorbed through the rumen wall directly and entered into blood circulation and presented antioxidant effects on host *** others were partially catabolized into volatile fatty acids by rumen microbes,and the possible catabolic pathways *** better understand plant cell wall degradation in the rumen,the metabolic fate of FA along with lignin decomposition mechanisms are needed to be explored via future microbial isolation and incubation studies with aims to maximize dietary fiber intake

关键词： Rumen microbes Ferulic acid Fiber digestion

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In-situ Enhanced Toughening of Poly（ethylene terephthalate）/elastomer Blends via Gamma-Ray Radiation at Presence of Trimethylolpropane Triacrylate

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Chinese Journal of Chemical Physics 2016年第6期29卷 703-709,I0001,I0002页

作者： Li-zhao Xie Le-chen Chen Mo-zhen Wang qi-chao wu Xiao Zhou Xue-wu Ge CASKeyLaboratoryofSoftMatterChemistry DepartmentofPolymerScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230026China GuangdongTiananNewMaterialCo. Ltd.Foshan528000China

Gamma-ray radiation has always been a convenient and effective way to modify the inter- facial properties in polymer blends. In this work, a small amount of trimethylolpropane triacrylate （TMPTA） was incorporated into poly（ethylene terephthalate）（PET）/random terpolymer elastomer （ST2000） blends by melt-blending. The existence of TMPTA would induce the crosslinking of PET and ST2000 molecular chains at high temperatures of blend- ing, resulting in the improvement in the impact strength but the loss in the tensile strength. When the PET/ST2000 blends were irradiated by gamma-ray radiation, the integrated me- chanical properties could be enhanced significantly at a high absorbed dose. The irradiated sample at a dose of 100 kGy even couldn＇t be broken under the impact test load, and at the same time, has nearly no loss of tensile strength. Based on the analysis of the impact- fractured surface morphologies of the blends, it can be concluded that gamma-ray radiation at high absorbed dose can further in situ enhance the interfacial adhesion by promoting the crosslinking reactions of TMPTA and polymer chains. As a result, the toughness and strength of PET/ST2000 blend could be dramatically improved. This work provides a facial and practical way to the fabrication of polymer blends with high toughness and strength.

关键词： Toughened PET blend Interracial interaction Gamma-ray radiation Radia- tion crosslink Trimethylolpropane triacrylate

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Synthesis and morphology control of raspberry-like poly(ethylene terephthalate)/polyacrylonitrile microspheres

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Chinese Chemical Letters 2016年第2期27卷 195-199页

作者： Yong-Fei Xu Mo-Zhen Wang qi-chao wu Xiao Zhou Xue-wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China School of Materials and Chemical Engineering Anhui Jianzhu University Guangdong Tianan New Material Co. Ltd.

The fabrication of raspberry-like poly（ethylene terephthalate）/polyacrylonitrile（PET/PAN） microspheres by g-ray radiation-induced polymerization of acrylonitrile on micron-sized PET microspheres were first reported in this work. A PET emulsion was firstly prepared by dispersing a PET solution with 1,1,2,2-tetrachloroethane/phenol mixture as the solvent into an aqueous solution of sodium dodecyl ***, PET microspheres were formed by precipitating the PET emulsion droplets from ethanol. The influence of the PET solvent and the weight ratio of ethanol to PET emulsion on the morphology of the PET microspheres had been investigated. After the surface of the prepared PET microspheres was grafted with poly（acrylic acid）, the grafting polymerization of AN also had been successfully initiated by g-ray radiation to form PAN microspheres with a size of about 100 nm on the PET microspheres. This work provides a new method to fabricate micron-sized PET microspheres, and further expands the functionalization of PET and its application fields.

关键词： PET emulsion Emulsion precipitation PET microsphere Raspberry-like microsphere PET/PAN composite microspheres

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Melatonin for the treatment of spinal cord injury

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Neural Regeneration Research 2018年第10期13卷 1685-1692页

作者： Yan Zhang Wen-Xiu Zhang Yan-Jun Zhang Ya-Dong Liu Zong-Jian Liu qi-chao wu Yun Guan Xue-Ming Chen Central Laboratory Beijing Luhe HospitalCapital Medical University Department of Orthopedics Beijing Luhe HospitalCapital Medical University Department of Anesthesiology and Critical Care Medicine Johns Hopkins University Department of Neurological Surgery Johns Hopkins University

Spinal cord injury（SCI） from trauma or disease severely impairs sensory and motor function. Neurorehabilitation after SCI is a complex medical process that focuses on improving neurologic function and repairing damaged connections in the central nervous system. An increasing number of preclinical studies suggest that melatonin may be useful for the treatment of SCI. Melatonin is an indolamine that is primarily secreted by the pineal gland and known to be regulated by photoperiodicity. However, it is also a versatile hormone with antioxidative, antiapoptotic, neuroprotective, and anti-inflammatory properties. Here, we review the neuroprotective properties of melatonin and the potential mechanisms by which it might be beneficial in the treatment of SCI. We also describe therapies that combine melatonin with exercise, oxytetracycline, and dexamethasone to attenuate the secondary injury after SCI and limit potential side effects. Finally, we discuss how injury at different spinal levels may differentially affect the secretion of melatonin.

关键词： spinal cord injury melatonin secondary damage neuroprotection antioxidative antiapoptotic anti-inflammatory synergistic effects neural regeneration

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Wheat silage partially replacing oaten hay exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs

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Animal Nutrition 2023年第4期15卷 332-340页

作者： Zhao-Yang Cui Wen-Juan Li Wei-Kang Wang qi-chao wu Yao-Wen Jiang Ailiyasi Aisikaer Fan Zhang He-Wei Chen Hong-Jian Yang State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

This study aimed to investigate the feeding effect of wheat silage on growth performance,nutrient digestibility,rumen fermentation,and microbiota composition in feedlot ***-four male crossbred Chinese Han lambs(BW=27.8±0.67 kg,3 months of age)were randomly assigned to four ration groups with wheat silage replacing 0%(WS0),36%(WS36),64%(WS64),and 100%(WS100)of oaten hay on forage dry matter *** concentrate-to-forage ratio was 80:20 and the feeding trial lasted 52 *** wheat silage inclusion linearly decreased dry matter intake by 4%to 27%(P<0.01).However,increasing the wheat silage replacement of oaten hay by no more than 64%improved the feed efficiency by 14%as noted by the feed-to-gain ratio(P=0.04).Apparent digestibility of organic matter(P<0.01),neutral detergent fibre(P=0.04)and acid detergent fibre(P<0.01)quadratically *** nitrogen(P=0.01)decreased while microbial protein production(P<0.01)increased with the increase of wheat silage *** volatile fatty acids concentration increased quadratically with the increase of wheat silage inclusion(P<0.01),and the highest occurred in *** molar proportion of acetate(P<0.01)and acetate-to-propionate ratio(P=0.04)decreased while butyrate(P<0.01)and isovalerate(P=0.04)*** wheat silage inclusion increased the Firmicutes-toBacteroidota ratio by 226%to 357%,resulting in Firmicutes instead of Bacteroidota being the most abundant *** relative abundance of cellulolytic Ruminococcus numerically increased but that of amylolytic Prevotella(P<0.01)decreased as increasing wheat silage *** together,increasing wheat silage replacement of oaten hay by no more than 64%exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs due to the change of Firmicutes-to-Bacteroidota ratio in the rumen.

关键词： Wheat silage Oaten hay Growth performance Nutrient digestibility Rumen fermentation Feedlot lamb

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区间参数结构平稳随机载荷识别方法

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计算力学学报 2018年第6期35卷 691-697页

作者：祁武超刘恒沈阳航空航天大学航空航天工程学部沈阳110136

针对贫信息下不确定性结构的随机载荷识别问题,使用基于Taylor展开的区间分析方法,提出了一种不确定性结构随机载荷识别的非概率区间方法。该识别方法在频域中进行,识别时使用区间变量描述工程结构中的不确定性参数。基于测点的响应谱... 详细信息

针对贫信息下不确定性结构的随机载荷识别问题,使用基于Taylor展开的区间分析方法,提出了一种不确定性结构随机载荷识别的非概率区间方法。该识别方法在频域中进行,识别时使用区间变量描述工程结构中的不确定性参数。基于测点的响应谱密度函数,首先对不确定性参数的名义值点进行随机载荷识别,其次计算载荷关于不确定性参数的灵敏度,最后基于区间扩张理论获得识别载荷谱的上下界值。算例结果表明,使用区间方法得到的不确定性结构的载荷谱识别区间界值都能完全包含载荷真值,此方法能够在结构设计时给出更为可靠的载荷工况。

关键词：不确定性区间参数结构载荷识别功率谱密度随机载荷

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基于多重子域代理模型的结构可靠性分析

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计算力学学报 2019年第2期36卷 160-165页

作者：赵维涛吴广祁武超沈阳航空航天大学航空航天工程学部沈阳110136

基于合理子域概念,构建多重代理模型。多重代理模型在合理子域内采用经典响应面模型,在合理子域外采用经典Kriging模型,能够充分利用两种经典模型各自的优势。多重代理模型能够合理规避经典响应面模型中响应函数采取事先假定形式带来的... 详细信息

基于合理子域概念,构建多重代理模型。多重代理模型在合理子域内采用经典响应面模型,在合理子域外采用经典Kriging模型,能够充分利用两种经典模型各自的优势。多重代理模型能够合理规避经典响应面模型中响应函数采取事先假定形式带来的可靠度评估风险,同时能够有效避免经典Kriging模型中试验点组合爆炸的问题。相比经典响应面模型,多重代理模型所需试验点数量并未增加,计算效率与经典响应面模型大体相同。算例表明,本文方法的计算结果与MCS的计算结果几乎一致,具有较好的计算精度。

关键词：结构可靠性代理模型合理子域经典响应面 Kriging

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Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

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Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu wu qi Chen Jiaxin Yang Bonan Liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

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基于主动学习Kriging模型的结构多失效模式可靠度计算

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计算力学学报 2020年第1期37卷 8-13页

作者：赵维涛陈欢祁武超沈阳航空航天大学航空宇航学院沈阳110136

对于具有多失效模式的结构可靠度计算问题,利用多输出Kriging模型作为代理模型进行分析。该代理模型只需对所有功能函数进行一次建模,无需对每个功能函数建立各自的代理模型,且在建模过程中能够考虑各失效模式之间的相关性。本文方法设... 详细信息

对于具有多失效模式的结构可靠度计算问题,利用多输出Kriging模型作为代理模型进行分析。该代理模型只需对所有功能函数进行一次建模,无需对每个功能函数建立各自的代理模型,且在建模过程中能够考虑各失效模式之间的相关性。本文方法设定的初始样本点不仅对随机变量均值附近区域给予足够重视,而且能够兼顾设计空间的边缘区域,进而确保初始代理模型在全局空间内具有较好精度,以减少后续利用学习函数更新代理模型的次数。数值算例表明,本文方法具有较好的计算精度和较高的计算效率,当失效模式较多时,计算效率大幅提升。

关键词：可靠度多失效模式代理模型多输出Kriging 学习函数

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结构可靠性优化的多输出高斯过程代理模型

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计算力学学报 2020年第2期37卷 145-150页

作者：赵维涛刘照琳祁武超沈阳航空航天大学航空宇航学院沈阳110136

对于具有多失效模式的结构,基于可靠性的结构优化计算成本是比较昂贵的。本文利用多输出高斯过程MOGP(Multiple Output Gaussian Process)代理模型以降低计算成本,首先利用Bucher方法生成初始样本,然后结合均匀训练样本和学习函数对MOG... 详细信息

对于具有多失效模式的结构,基于可靠性的结构优化计算成本是比较昂贵的。本文利用多输出高斯过程MOGP(Multiple Output Gaussian Process)代理模型以降低计算成本,首先利用Bucher方法生成初始样本,然后结合均匀训练样本和学习函数对MOGP代理模型进行构建。学习函数可在大范围内筛选出较为满意的训练样本,能够确保MOGP代理模型具有较好的全局精度,在整个优化过程中不再重新构建MOGP代理模型。利用协方差矩阵,MOGP代理模型能够考虑各失效模式的相关性,对多输入多输出系统具有良好的预测性能。数值算例表明,本文方法具有较好的计算结果,且计算效率较高,尤其是设计变量数目与失效模式数目较多时效率提升明显。

关键词：可靠性代理模型多输出高斯过程学习函数优化

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