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Polyethersulfone-polyvinylpyrrolidone composite membranes: Effects of polyvinylpyrrolidone content and polydopamine coating on membrane morphology, structure and performances

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Chinese Journal of Chemical Engineering 2021年第10期34卷 84-97页

作者： Yanna Wu Jianxian Zeng Yajie Zeng Hu Zhou guoqing liu Jian Jian Jie Ding School of Chemistry and Chemical Engineering Hunan University of Science and TechnologyHunan Provincial Engineering Research Center for Functional MembranesXiangtan 411201China School of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081China

Hydrophilic modification is a promising method to inhibit fouling formation on ultrafiltration *** this work,different mass concentrations(1%–16%)of hydrophilic polyvinylpyrrolidone were incorporated into polyethersulfone(PES)membranes fabricated by none-solvent induced phase ***,polydopamine(PDA)coating on the surface of prepared membrane was carried out at pH *** morphology and structure,surface hydrophilicity,permeation flux,BSA rejection,antifouling and stability performances of PES and PDA/PES modified membranes were investigated in *** results indicated that PDA was successfully attached onto the *** hydrophilicity was evaluated by water contact angle *** contact angles of modified membranes reduced remarkably,suggesting that the membrane hydrophilicities were significantly *** results of filtration tests,which were done by dead-end filtration of bovine serum albumin solution,showed that the properties of permeability and fouling resistance were obviously improved by PDA *** polyvinylpyrrolidone mass content reached 10%,flux recovery ratio of modified membrane was up to91.23%,and its BSA rejection were over 70%.The results of stability tests showed that the modified membranes had good mechanical stability and chemical *** facile fabrication procedure and outstanding performances suggested that the modified membranes had a potential in treating fouling.

关键词： Polyethersulfone membrane Polydopamine coating Hydrophilicity Permeability Antifouling

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一种农杆菌介导的糜子高效遗传转化方法

热带作物学报 2025年第1期46卷 44-50页

作者：夏启玉降彦苗刘亚男李海权程汝宏郭安平刘国庆赵辉中国热带农业科学院三亚研究院/中国热带农业科学院热带生物技术研究所/海南省南繁生物安全与分子育种重点实验室海南三亚572024 河北农林科学院谷子研究所河北石家庄050035

糜子(Panicum miliaceum L.)是我国传统的粮食作物,截至目前,针对糜子遗传转化方法的研究仍较少,本研究旨在建立农杆菌介导的糜子高效遗传转化方法。以糜子品种冀黍5号的成熟种子为外植体,在CIM和MSD诱导培养基上分别诱导糜子的胚性愈伤... 详细信息

糜子(Panicum miliaceum L.)是我国传统的粮食作物,截至目前,针对糜子遗传转化方法的研究仍较少,本研究旨在建立农杆菌介导的糜子高效遗传转化方法。以糜子品种冀黍5号的成熟种子为外植体,在CIM和MSD诱导培养基上分别诱导糜子的胚性愈伤,以其作为转化受体材料,用含植物表达载体的农杆菌侵染60min并共培养6d,转接至含0.025g/L潮霉素的筛选培养基上筛选出抗性愈伤,接着在含0.015g/L潮霉素的分化培养基上分化,最后在含0.015g/L潮霉素的生根培养基上生根成苗,用载体特异性引物对再生植株进行PCR检测,鉴定其是否为阳性转基因植株。根据多个批次的转化实验统计糜子的抗性再生植株的筛选效率和转化效率。结果表明:CIM和MSD诱导培养基均能诱导出糜子胚性愈伤,但CIM培养基诱导的糜子胚性愈伤效果更好;糜子胚性愈伤在被农杆菌侵染及与农杆菌共培养后,经在含潮霉素的培养基上筛选、分化和生根后获得多株抗性再生糜子植株,3次试验获得的糜子抗性再生植株的PCR鉴定阳性率为100%,平均转化效率为30%以上。本研究成功建立了农杆菌介导的糜子遗传转化方法,操作简单,转化效率高,成本低廉,且转化不受季节限制,能规模化开展,为糜子的遗传改良提供有效的技术手段。

关键词：糜子农杆菌遗传转化转化效率

A Self-learning Terrain-following Method for Aircrafts 36

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A Self-learning Terrain-following Method for Aircrafts

Determination of optimal dietary selenium levels by full expression of selenoproteins in various tissues of broilers from 1 to 21 d of age

第36届中国控制会议

作者： Shuandao Li guoqing liu Jiang Wu School of Automation Science and Electrical Engineering Beihang University

ISBN: (纸本)9781538629185

This paper addresses the decision problem for terrain-following flights（TFFs） of aircrafts in unknown environments,where global trajectory planning methods cannot be applied *** such cases,the uncertainties and complexities of the terrain are needed to be dealt with *** order to realize the automatic generation of a terrain-following（TF） controller,a self-learning TF method is proposed in this *** self-learning TF method is based on a MDP model and utilizes reinforcement learning algorithm to optimize the maneuver strategies of the *** TF controller is generated off-line,and then it’s applied and tested in some unknown *** results illustrate the effectiveness of this method.

关键词： Terrain-following Flights Reinforcement Learning Self-learning Optimization

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Animal Nutrition 2021年第4期7卷 1133-1144页

作者： Xiudong Liao guoqing liu Guangming Sun Xiaoming Sun Tao liu Lin Lu Liyang Zhang Minhong Zhang Yanli Guo Xugang Luo Mineral Nutrition Research Division State Key Laboratory of Animal NutritionInstitute of Animal ScienceChinese Academy of Agricultural SciencesBeijingChina Poultry Mineral Nutrition Laboratory College of Animal Science and TechnologyYangzhou UniversityYangzhouChina College of Animal Science and Technology Gansu Agricultural UniversityLanzhouChina Biochemistry Department Case Western Reserve UniversityClevelandUSA State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement LhasaChina Institute of Animal Science and Veterinary Tibet Academy of Agricultural and Animal Husbandry SciencesLhasaChina

The current NRC dietary selenium(Se)requirement(0.15 mg/kg)of broilers is primarily based on growth performance data reported in *** study aimed to determine optimal dietary Se levels of broilers fed a practical corn-soybean meal diet for the full expression of selenoproteins in various tissues.A total of 384 one-d-old male broilers(n=8 replicates/diet)were fed a basal corn-soybean meal diet or the basal diet supplemented with 0.1,0.2,0.3,0.4 or 0.5 mg Se/kg in the form of Na_(2)SeO_(3) for 21 *** analysis was conducted to evaluate the optimal dietary Se levels using broken-line,quadratic or asymptotic *** activity of glutathione peroxidase(GPX)in the plasma,liver,kidney and pancreas,iodothyronine deiodinase(DIO)in the plasma,liver and pancreas,and thioredoxin reductase(Txnrd)in the liver and pancreas,the mRNA levels of Gpx1,Gpx4,Dio1,selenoprotein(Seleno)h,Selenop and Selenou in the liver,Gpx4,Dio1,Txnrd1,Txnrd2,Selenoh,Selenop and Selenou in the kidney,and Gpx1,Gpx4,Selenoh and Selenou in the pancreas,and the protein levels of GPX4 in the liver and kidney of broilers were influenced(P<0.05)by added Se levels,and increased quadratically(P<0.05)with the increase of added Se *** estimates of optimal dietary Se levels were 0.07 to 0.36 mg/kg based on the fitted broken-line,quadratic or asymptotic models(P<0.001)of the aforementioned selenoprotein expression in the plasma,liver and kidney,and 0.09 to 0.46 mg/kg based on the fitted broken-line models(P<0.001)of the aforementioned selenoprotein expression in the *** results indicate that the optimal dietary Se levels would be 0.36 mg/kg to support the full expression of selenoproteins in the plasma,liver and kidney,and 0.46 mg/kg to support the full expression of selenoproteins in the pancreas of broilers fed a practical corn-soybean meal diet from 1 to 21 d of age.

关键词： Selenium Selenoprotein Gene expression Requirement Broiler

Phase Evolution Study and Optimization of the Heat Treatment Process for High Current Capacity Bi-2223 Tapes

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Journal of Wuhan University of Technology(Materials Science) 2017年第4期32卷 862-865页

作者：白利锋张胜楠 LI Chengshan HAO Qingbin liu guoqing ZHANG Pingxiang The state Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi 'an 710072 China Superconducting Materials' Research Center Northwest Institute for Nonferrous Metal Research Xi 'an 710016 China

Powder in tube process（PIT） was adopted for the fabrication of single filament Bi-2223 tapes, and a heat treatment process including the first heat treatment（HT1）, intermediate rolling（IR）, and second heat treatment（HT2） was performed. The phase evolution mechanism and microstructure changes during these heat treatment processes were systematically discussed. The influences of HT1 parameters on the phase evolution process of Bi-2223 tapes were discussed. With the optimized HT1 process, a proper Bi-2223 content of about 90% was achieved. HT2 process was also optimized by adding a post annealing process. An obvious increase of current capacity was obtained due to the enhancement of intergrain connections. Single filament Bi-2223 tapes with the critical current of Ic-90 A were fabricated with the optimized sintering process.

关键词： high temperature superconductor Bi-2223 phase evolution spray drying critical current density

Modeling the Sojourn Time of Items for In-Networ Cache Based on LRU Policy

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China Communications 2014年第10期11卷 88-95页

作者： liu Jiang WANG guoqing HUANG Tao CHEN Jianya liu Yunjie State Key Laboratory of Networking and Switching Technology. Beijing University of Posts and Telecommunications Beijing 100876 China.

To reduce network redundancy,innetwork caching is considered in many future Internet architectures,such as Information Centric *** in-network caching system,the item sojourn time of LRU(Least Recently Used) replacement policy is an important issue for two reasons:firstly,LRU is one of the most common used cache policy;secondly,item sojourn time is positively correlated to the hit probability,so this metric parameter could be useful to design the caching ***,to the best of our knowledge,the sojourn time hasn't been studied theoretically so *** this paper,we first model the LRU cache policy by Markov *** an approximate closedform expression of the item expectation sojourn time is provided through the theory of stochastic service system,which is a function of the item request rates and cache ***,extensive simulation results are illustrated to show that the expression is a good approximation of the item sojourn time.

关键词： sojourn time Markov chain LRU steady-state probability

Efficient selection of homozy-gous lines of hybrid rice restorer with the transgene Xa21 using test cross and PCR

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Chinese Science Bulletin 2001年第2期46卷 125-129页

作者： MA Bojun WANG Wenming ZOU Junhuang liu guoqing FANG Jin ZHU Lihuang ZHAI Wenxue Institute of Genetics Chinese Academy of SciencesBeijing 100101China Zhejiang Normal University Jinhua 321004China Yangzhou University Yangzhou 225009China

The homozygous restorer lines with a single copy of the transgene Xa21 have been obtained from the progenies of transgenic Minghui63 and Yanhui559 plants through PCR marker-assisted selection and test cross. These hom... 详细信息

关键词： test cross PCR marker-assisted selection rice restorer with the transgene Xa21 homozygous.

Mapping of a new gene for brown planthopper resistance in cultivated rice introgressed from Oryza eichingeri

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Chinese Science Bulletin 2001年第17期46卷 1459-1462页

作者： liu guoqing YAN Huihuang FU Qiang QIAN Qian ZHANG Zhitao ZHAI Wenxue ZHU Lihuang Institute of Genetics Chinese Academy of SciencesBeijing 100101China China National Rice Research Institute Hangzhou 310006China

Wild rice species is an important source of useful genes for cultivated rice improvement Some accessions of Oryza eichingeri (In = 24, CC) from Africa confer strong resistance to brown planthopper (BPH), whitebacked planthopper (WBPH) and bacterial blight (KB). In the present study, restriction fragments length polymorphism (RFLP) and simple sequence repeats (SSR) analysis were performed on disomic backcross plants between Oryza saliva (2n =24, AA) and O. eichingeri in order to identify the presence of O, eichingeri segments and further to localize BPH-resistant gene. In the introgression lines, 1-6 O. eichingeri segments were detected on rice chromosomes 1, 2, 6, or/and 10. The dominant BPH resistant gene, tentatively named Bphl3(t), was mapped to chromosome 2, being 6.1 and 5.5 cM away from two microsatellite markers RM240 and RM250, respectively. The transfer and localization of this gene from O. eichingeri will contribute to the improvement of BPH resistance in cultivated rice.

关键词： cultivated rice Oryza eichingeri brown planthopper resistance gene mapping.

A novel feature matching algorithm against moving background for indoor video surveillance 36

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A novel feature matching algorithm against moving background...