检索结果-南通市图书馆

Efficient biosynthesis of creatine by whole-cell catalysis from guanidinoacetic acid in Corynebacterium glutamicum

Synthetic and Systems Biotechnology 2024年第1期9卷 99-107页

作者： Chunjian Li Pengdong Sun Guoqing Wei Yuqi zhu Jingyuan Li Yanfeng Liu jian Chen Yang deng College of Food Science and Engineering Qingdao Agricultural UniversityQingdao 266109China Key Laboratory of Special Food Processing(Co-construction by Ministry and Province) Ministry of Agriculture Rural AffairsQingdao Agricultural UniversityQingdao 266109China Shandong Technology Innovation Center of Special Food Qingdao 266109China Qingdao Special Food Research Institute Qingdao 266109China Qingdao Nuoan Baite Biotechnology Co. Ltd.Qingdao 266109China Science Center for Future Foods Engineering Research Center of Ministry of Education on Food Synthetic Biotechnologyand Jiangsu Province Engineering Research Center of Food Synthetic BiotechnologyJiangnan UniversityWuxi 214122China Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxi 214122China

Creatine is a naturally occurring derivative of an amino acid commonly utilized in functional foods and ***,the current industrial synthesis of creatine relies on chemical processes,which may hinder its utilization in certain ***,a biological approach was devised that employs whole-cell biocatalysis in the bacterium Corynebacterium glutamicum,which is considered safe for use in food production,to produce safe-for-consumption *** objective of this study was to identify a guanidinoacetate N-methyltransferase(GAMT)with superior catalytic activity for creatine *** employing whole-cell biocatalysis,a gamt gene from Mus caroli(Mcgamt)was cloned and expressed in *** ATCC 13032,resulting in a creatine titer of 3.37 g/***,the study employed a promoter screening strategy that utilized nine native strong promoters in *** to enhance the expression level of *** highest titer was achieved using the P1676 promoter,reaching 4.14 g/*** conditions of whole-cell biocatalysis were further optimized,resulting in a creatine titer of 5.42 g/*** is the first report of successful secretory creatine expression in ***,which provides a safer and eco-friendly approach for the industrial production of creatine.

关键词： Creatine Corynebacterium glutamicum Whole-cell biocatalysis Guanidinoacetate N-Methyltransferase Food additive

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dynamic Strip Thickness Simulation on Five-Stand Cold Continuous Rolling Mill

引用

Journal of Iron and Steel Research International 2006年第2期13卷 30-32页

作者： SUN deng-yue DU Feng-shan XU Shi-min zhu Guang-ming ZHOU jian-gang College of Mechanical Engineering Yanshan University Qinhuangdao 066004 Hebei China Baosteel Technology Center Shanghai 201900 China

Based on a rolling model, the simulation of strip thickness during cold continuous rolling was made on the platform software Matrix. The simulation system combined the discrete system with continuous system for high speed and dynamics. Simulation parameters were calculated by differential element method, and the simulation results fit in with practical data very well.

关键词： cold continuous rolling thickness simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extracting copper from copper oxide ore by a zwitterionic reagent and dissolution kinetics

引用

International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 241-248页

作者： Jiu-shuai deng Shu-ming Wen jian-ying deng Dan-dan Wu State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource Engineering Kunming University of Science and Technology

Sulfamic acid （SA）, which possesses a zwitterionic structure, was applied as a leaching reagent for the first time for extracting copper from copper oxide ore. The effects of reaction time, temperature, particle size, reagent concentration, and stirring speed on this leach- ing were studied. The dissolution kinetics of malachite was illustrated with a three-dimensional diffusion model. A novel leaching effect of SA on malachite was eventually demonstrated. The leaching rate increased with decreasing particle size and increasing concentration, reac- tion temperature and stirring speed. The activation energy for SA leaching malachite was 33.23 kJ/mol. Furthermore, the effectiveness of SA as a new reagent for extracting copper from copper oxide ore was confirmed by experiment. This approach may provide a solution suitable for subsequent electrowinning. In addition, results reported herein may provide basic data that enable the leaching of other carbonate miner- als of copper, zinc, cobalt and so on in an SA system.

关键词： malachite copper extraction sulfamic acid dissolution kinetics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis-Aware Modelling of Spacial Curve for Isogeometric Analysis of Timoshenko Beam

引用

Computer Modeling in Engineering & Sciences 2020年第8期124卷 605-626页

作者： Yang Xia Luting deng jian Zhao School of Automotive Engineering State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian116024China

Geometric fitting based on discrete points to establish curve structures is an important problem in numerical *** purpose of this paper is to investigate the geometric fitting method for curved beam structure from points,and to get high-quality parametric model for isogeometric *** beam element is established for an initially curved spacial beam with arbitrary *** approximation and interpolation methods to get parametric models of curves from given points are examined,and three strategies of parameterization,meaning the equally spaced method,the chord length method and the centripetal method are *** influences of the different geometric approximation algorithms on the precision of isogeometric analysis are *** static analysis and the modal analysis with the established parametric models are carried *** examples with different complexities,the quarter arc curved beam,the Tschirnhausen beam and the Archimedes spiral beam are *** results show that for the geometric approximation the interpolation method performs good and maintains high *** fitting algorithms are able to provide parametric models for isogeometric analysis of spacial beam with Timoshenko *** equally spaced method and centripetal method perform better than the chord length method for the algorithm to carry out the parameterization for the sampling points.

关键词： Analysis-aware modelling curve fitting Timoshenko beam spatial curve isogeometric analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Graphic Sequences with a Realization Containing Intersecting Cliques

引用

Acta Mathematica Sinica,English Series 2012年第2期28卷 405-416页

作者： jian Hua YIN Yan Fang deng Department of Mathematics College of Information Science and Technology Hainan University

Let r ≥1, k ≥ 2 and Fm1,… k;r denote the most general definition of a friendship graph,

关键词： Degree sequence potentially P-graphic sequence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review of multiple optical vortices generation: methods and applications

引用

Frontiers of Optoelectronics 2019年第1期12卷 52-68页

作者： Long zhu jian WANG Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

Optical vortices carrying orbital angular momentum(OAM)have attracted increasing interest in recent *** vortices have seen a variety of emerging applications in optical manipulation,optical trapping,optical tweezers,optical vortex knots,imaging,microscopy,sensing,metrology,quantum information processing,and optical *** various optical vortices enabled applications,the generation of multiple optical vortices is of great *** this review article,we focus on the methods of multiple optical vortices generation and its *** review the methods for generating multiple optical vortices in three cases,i.e.,1-to-N collinear OAM modes,1-to-N OAM mode array and N-to-N collinear OAM *** applications of multiple OAM modes in optical communications and non-communication areas are *** trends,perspectives and opportunities are also discussed.

关键词： optical communications optical vortices orbital angular momentum (OAM) mode-division multiplexing (MDM) mode multicasting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

NiCe bimetallic nanoparticles embedded in hexagonal mesoporous silica (HMS) for reverse water gas shift reaction

引用

Chinese Chemical Letters 2022年第5期33卷 2590-2594页

作者： Hui Dai Siqi Xiong Yongqing zhu jian Zheng Lihong Huang Changjian Zhou Jie deng Xinfeng Zhang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China Department of Chemical Engineering Sichuan UniversityChengdu 610065China School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051China College of Pharmacy and Bioengineering Chengdu UniversityChengdu 610106China

Reverse water gas shift(RWGS)reaction is a crucial process in CO_(2)***,Ni-and NiCe-containing hexagonal mesoporous silica(Ni-HMS and NiCe-HMS)catalysts were synthesized using an insitu one-pot method and applied for RWGS *** certain reaction temperatures 500-750℃,Ni-HMS samples displayed a higher selectivity to the preferable CO than that of conventionally impregnated Ni/HMS *** could be originated from the smaller NiO nanoparticles over Ni-HMS ***-HMS exhibited higher activity compared to *** catalysts were characterized by means of TEM,XPS,XRD,H_(2)-TPR,CO_(2)-TPD,EPR and N_(2) adsorption-desortion *** was found that introduction of Ce created high concentration of oxygen vacancies,served as the active site for activating CO_(2).Also,this work analyzed the effect of the H_(2)/CO_(2)molar ratio on the best *** reaction gas H_(2)/CO_(2)molar ratio was 4 significantly decreased the selectivity to CO at low temperature,but triggered a higher CO_(2)conversion which is close to the equilibrium.

关键词： Greenhouse gases Reverse water gas shift reaction CO selectivity CeO_(2) Hexagonal mesoporous silica

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An executable modeling and analyzing approach to C4ISR architecture

引用

Journal of Systems Engineering and Electronics 2020年第1期31卷 109-117页

作者： HE Hongyue zhu Weixing LI Ruiyang deng Qiaoyu Institute of Command and Control Engineering Army Engineering University of PLA

To analyze the behavioral model of the command,control,communication,computer,intelligence,surveillance,reconnaissance(C4ISR)architecture,we propose an executable modeling and analyzing approach to ***,the meta concept model of the C4ISR architecture is *** to the meta concept model,we construct the executable meta models of the C4ISR architecture by extending the meta models of ***,we define the concrete syntax and executable activity algebra(EAA)semantics for executable *** semantics functions are introduced to translating the syntax description of executable models into the item of *** support the execution of models,we propose the executable rules which are the structural operational semantics of ***,an area air defense of the C4ISR system is used to illustrate the feasibility of the approach.

关键词： command control communication computer intelligence surveillance reconnaissance(C4ISR)architecture meta model executable model algebraic semantics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Film mulching reduces antibiotic resistance genes in the phyllosphere of lettuce

引用

Journal of Environmental Sciences 2022年第2期34卷 121-128页

作者： Beiqi deng Wen Li Huijie Lu Lizhong zhu College of Environmental and Resource Sciences Zhejiang UniversityHangzhou310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process andControl Hangzhou310058China

Phyllosphere is an important reservoir of antibiotic resistance genes(ARGs),but the transfer mechanism of ARGs from soil and air to phyllosphere remains *** study demonstrated that soil-air-phyllosphere was the dominant ARG transfer pathway,and blocking it by film mulching can reduce typical phyllosphere ARGs in lettuce by 80.7%-98.7%(89.5%on average).To further eliminate phyllosphere ARGs in lettuce grown with film mulching,the internal soil-endosphere-phyllosphere transfer pathway deserves more *** analyzed the ARG hosts and the resistome in lettuce rhizosphere and phyllosphere with film mulching via hybrid Illumina-Nanopore *** sp.7SR1 was more abundant than other ARG hosts,accounting for 1.0%and 47.1%of the total bacteria in rhizosphere and phyllosphere,*** species has flagella that can promote mobility and can excrete extracellular polymeric substances and/or surfactant-like microbial products,which benefits its colonization in the *** the migration of Pseudomonas sp.7SR1 via the soil-endosphere-phyllosphere pathway would be effective to further reduce ARGs in *** resistant genes were predominant in phyllosphere(40.3%of the total),and 87.6%of the phyllosphere ARGs were located on chromosomes,indicating relatively low horizontal gene transfer(HGT)*** study provides insights into the transfer mechanism,hosts,and control strategies of phyllosphere ARGs in typical plants.

关键词： Antibiotic resistance genes Phyllosphere Rhizosphere Transfer pathway Host bacteria

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Flow-field analysis of a continuous gas-solid separation fluidized bed equipped with a moving scraper

引用

Particuology 2021年第4期19卷 45-55页

作者： Bo Lv Xiaowei deng Chaojun Fang Xiangnan zhu College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Henan Key Laboratory for Green and Efficient Mining&Comprehensive Utilization of Mineral Resources Henan Polytechnic UniversityJiaozuo 454000China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China

Continuous gas-solid separation fluidized beds are one of the most widely used practical operation units for the dry separation of coal in China,particularly in Northwest China,and they can effectively promote the efficient and clean utilization of raw *** a continuous gas-solid separation fluidized bed,the bed flow field is the concrete manifestation of the fluidization ***,the complexity of the flow field increases under the action of a moving *** this study,a combination of computational fluid dynamics(CFD)simulations and experimental measurements was used to study the changes in the flow field of a fluidized *** results showed that when the scraper moved,the local flow field(mainly characterized by the movement of medium particles)near the scraper was affected not only by the common airflow or bubbles,but also by the lateral driving force of the *** the scraper speed was v_(l)<6.0 cm/s,it reduced the frequency of the formation of large bubbles and alleviated the random fluctuation of the nearby particle collision stress signals,which improved the fluidization stability of the ***,the movement of the scraper affected the global flow *** flow field shifted to the right near the scraper,with the direction of the scraper movement,while the flow field exhibited a leftward trend on the surface of the bed,accompanied by some vortices,in the middle and lower parts of the ***,the critical height of the area,directly affected by the scraper,increased from 52 to 54 mm with an increase in its operating speed from v_(l)=2.96 cm/s to v_(l)=4.44 cm/s,*** provides a theoretical basis for further understanding the hydrodynamic characteristics of fluidized beds.

关键词： Simulation analysis Moving scraper Flow-field Particle collision pressure Hydrodynamic characteristics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：