油桐籽不同年份和含油率差异对其含油率NIR检测模型影响的研究
作者:
马强;李水芳;付红军;王琼;文瑞芝
期刊:
中国粮油学报 ,2019年34(6):92-96 ISSN:1003-0174
作者机构:
[马强; 李水芳; 文瑞芝] College of Science, Central South University of Forestry & Technology, Changsha, 410004, China;[付红军; 王琼] College of Food Science and Engineering, Central South University of Forestry & Technology, Changsha, 410004, China
关键词:
油桐籽;年份;含油率;近红外光谱
摘要:
收集了2014和2015年的油桐籽样本,用偏最小二乘法(PLS)分别建立了单一年份、混合年份及单一年份不同含油率范围的油桐籽含油率近红外光谱(NIR)检测模型,并验证.结果 显示单一年份模型对本年份样本有较好预测,而对另一单一年份样本的预测精度明显下降,而混合年份模型对各年份样本都有较好预测;同年份不同含油率范围样本所建模型,含油率范围大,则模型预测精度下降,但稳定性更好.利用竞争性自适应重加权(CARS)算法筛选出30个变量,并结合PLS对混合年份样本建模,既简化了模型,又提高了模型预测性能,验证集相关系数为0.929,均方根误差为1.765,相对标准偏差为3.31%.因此,建立油桐籽含油率NIR检测模型时,应收集不同年份、不同含油率范围样本,并结合特征波长,以建立预测精度更好、稳定可靠且适应范围广的检测模型.
语种:
中文
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Improving dispersive property, biocompatibility and targeting gene transfection of graphene oxide by covalent attachment of polyamidoamine dendrimer and glycyrrhetinic acid
作者:
Liu, Feiyan;Yang, Dan;Liu, Yawen;Cao, Qianqian;Sun, Yulian;...
期刊:
Colloids and Surfaces B: Biointerfaces ,2018年171:622-628 ISSN:0927-7765
通讯作者:
Tang, Hao
作者机构:
[Liu, Feiyan; Yang, Dan; Liu, Yawen; Cao, Qianqian; Wang, Qiong; Sun, Yulian; Tang, Hao] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Wang, Qiong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Tang, Hao] H;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
关键词:
Cytotoxicity;Glycyrrhetinic acid;Graphene oxide;Polyamidoamine dendrimers;Targeting gene transfection
摘要:
The surface functional groups of GO have significant effects on the performances of GO-based gene delivery vector. In this work, the polyamidoamine (PAMAM) dendrimer and glycyrrhetinic acid (GA) were tethered onto the GO surface by one-step covalently cross-linking method. The micro-morphology, surface functional groups, and zeta potential of the obtained GO-PAMAM-GA hybrid were characterized and verified. The effects of GA amount in the hybrid on the dispersive property in cell culture medium, in vitro cytotoxicity to human hepatocarcinoma (SMMC-7721) and human embryonic kidney (HEK-293) cells, and gene (plasmid DNA of enhanced green fluorescent protein) transfection capacity were investigated in detail. Under optimal conditions, the obtained hybrid shows small average size (about 160 nm) and has very good dispersive stability (in 30 days) in cellular culture medium. Compared with the GO-PAMAM without GA modification, the GO-PAMAM-GA hybrid exhibits greatly enhanced biocompatibility to the two cell lines. The cellular viability of SMMC-7721 cells still retains about 98% even the concentration of the hybrid up to 200 μg mL<sup>−1</sup>. The gene transfection capacity of the GO-PAMAM has been improved about 50% through the GA functionalization. Moreover, the GO-PAMAM-GA hybrid possesses targeting gene transfection to SMMC-7721 cells.<br/> ©2018 Elsevier B.V.
语种:
英文
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林业院校基础《无机及分析化学实验》教学改革与实践
作者:
李水芳;王琼;马强
期刊:
广东化工 ,2018年45(2):216-217 ISSN:1007-1865
作者机构:
中南林业科技大学 理学院,湖南 长沙,410004;[马强; 王琼; 李水芳] 中南林业科技大学
关键词:
林业院校;《无机及分析化学实验》;教学改革
摘要:
充分发挥学生的主观能动性、调动学生的实验积极性和提高学生实验兴趣是有效提高实验教学质量的重要路径。文章分析了林业院校基础《无机及分析化学实验》原有教学模式和成绩评定方式存在的弊端及由此带来的不良后果,从学生实验预习方式、教师授课方式和学生成绩评定方式三方面进行了改革。不同专业两个学年的改革实践表明改革后的教学模式和成绩评定方式在充分发挥学生主观能动性、有效调动学生实验积极性和提高学生实验兴趣方面是有效的。
语种:
中文
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气相色谱- 质谱法分析柚木光辐射前后的抽提物成分
作者:
李慧;曾栋;黄自知;马强;王琼;...
期刊:
中南林业科技大学学报 ,2018年38(2):122-128 ISSN:1673-923X
作者机构:
中南林业科技大学理学院, 湖南, 长沙, 410004;湖南省疾病预防控制中心, 湖南, 长沙, 410005;[李慧; 黄自知; 马强; 王琼; 胡云楚; 文瑞芝] 中南林业科技大学理学院, 湖南, 长沙, 410004;[曾栋] 湖南省疾病预防控制中心, 湖南, 长沙, 410005
关键词:
柚木;抽提物;光辐射;光变色;气相色谱-质谱法
摘要:
采用气相色谱-质谱法分析柚木光辐射前后的抽提物成分,考察了柚木光辐射前后的颜色和组成变化,确定了可能引起柚木光变色的主要成分。结果显示,柚木光照100 h后黄蓝指数变化最为明显,表面变成金黄色,从柚木光辐射前后的抽提物中共鉴定出76种成分,其中柚木光辐射前的抽提物中鉴定出55种成分,柚木光辐射后的抽提物中鉴定出49种成分,包括烃类、醇类、酚类、酯类、醛类、酮类、蒽醌类和胺类,辐射后的柚木抽提物中烯烃类从20.11%减少至8.80%,由5种烯烃类减少为4种;酮类从0.99%增加到9.19%,由5种酮类增加为9种;杂环类化合物从20.56%减少到1.54%,由6种杂环类减少为1种。柚木单板表面光辐射后变亮、变黄,随着辐射时间加长,可变成受人欢迎的金黄色,这可能与抽提物中化合物成分的种类和含量有关,木材抽提物中的酚羟基、羰基、双键等结构与木材光变色有很大关系。柚木光辐射前抽提物的成分主要为反式角鲨烯(20.108%)、2-甲基蒽醌(13.110%)、1-甲基-3,4-二氢异喹啉(12.452%)、2-羟甲基蒽醌(8.210%)、8-甲氧基-1-甲基-.beta.-咔啉(6.552%)这5种化合物,这些主成分都含有与木材光变色相关的双键或者羰基。辐射后除了8-甲氧基-1-甲基-.beta.-咔啉和1-甲基-3,4-二氢异喹啉检测不到以外,相对百分含量减少较大的是反式角鲨烯(9.970%)和2-羟甲基蒽醌(5.368%),只有2-甲基蒽醌(13.678%)相对百分含量增加。而且由于2-甲基蒽醌为黄色晶体,因此推测柚木表面黄色的深浅可能与有效成分2-甲基蒽醌的量有关,但柚木光变色的具体原因和机理还有待进一步研究。
语种:
中文
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Existence of three positive periodic solutions of second-order neutral functional differential equations with parameters
作者:
Dai B.;Wang Q.;Zhang L.
期刊:
Journal of Mathematical Control Science and Applications ,2018年4(2):137-148 ISSN:0974-0570
作者机构:
[Wang Q.; Zhang L.] School of Mathematical Science and Computing Technology, Central South University, Changsha, Hunan 410075, China;Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha, Hunan 410004, China;[Dai B.] School of Mathematical Science and Computing Technology, Central South University, Changsha, Hunan 410075, China<&wdkj&>Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
关键词:
Leggett-Williams fixed point theorem;Neutral functional differential equation;Periodic solution
摘要:
In this paper, a type of second-order neutral functional differential equations are considered. We establish the sufficient conditions for the existence of three positive periodic solutions by using the Leggett- Williams fixed point theorem. © 2019, Muk Publications and Distributions. All rights reserved.
语种:
英文
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农林院校基础化学实验技术人员绩效考核体系
作者:
黄自知;王文磊;文瑞芝;王琼;胡云楚
期刊:
实验技术与管理 ,2018年35(3):239-243 ISSN:1002-4956
作者机构:
中南林业科技大学理学院,湖南长沙,410004;[文瑞芝; 王文磊; 黄自知; 胡云楚; 王琼] 中南林业科技大学
关键词:
实验技术人员;量化标准;绩效考核体系;农林院校
摘要:
化学实验技术人员绩效考核是关系到实验室建设、发展和改革的重要环节。结合中南林业科技大学基础化学实验中心的实际情况,按照科学、公正、客观和全面的原则,提出了一套针对高等农林院校化学实验技术人员的量化标准和绩效考核体系。
语种:
中文
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An organic electrochemical transistor for determination of microRNA21 using gold nanoparticles and a capture DNA probe
作者:
Peng, Jing;He, Tao;Sun, Yulian;Liu, Yawen;Cao, Qianqian;...
期刊:
Microchimica Acta ,2018年185(9):1-8 ISSN:0026-3672
通讯作者:
Tang, Hao
作者机构:
[He, Tao; Liu, Yawen; Cao, Qianqian; Wang, Qiong; Sun, Yulian; Peng, Jing; Tang, Hao] Hunan Normal Univ, Coll Chem & Chem Engn, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ, Changsha 410081, Hunan, Peoples R China.;[Wang, Qiong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Tang, Hao] H;Hunan Normal Univ, Coll Chem & Chem Engn, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ, Changsha 410081, Hunan, Peoples R China.
关键词:
gold;metal nanoparticle;microRNA;MIRN21 microRNA, human;chemistry;devices;DNA probe;electrochemical analysis;genetic procedures;human;limit of detection;procedures;Biosensing Techniques;DNA Probes;Electrochemical Techniques;Gold;Humans;Limit of Detection;Metal Nanoparticles;MicroRNAs
摘要:
A method is described for the determination of microRNA. It is based on the use of organic electrochemical transistors (OECTs) fabricated on a flexible poly(ethylene terephthalate) substrate. A gold electrode was modified with gold nanoparticles to immobilize the capture DNA probe and then served as the gate of the device. The detection of microRNA21 was realized by monitoring the change of the drain-source current after hybridization of capture DNA with microRNA21. Under optimal conditions, this biosensor exhibits good sensitivity and specificity. It works in the 5 pM to 20nM microRNA concentration range and has a 2 pM detection limit. [Figure not available: see fulltext.]. © 2018, Springer-Verlag GmbH Austria, part of Springer Nature.
语种:
英文
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锌基量子点的合成、表面修饰及其生物化学传感应用
作者:
陈秋菊;谢奇龙;马莉萍;王琼;胡云楚;...
期刊:
功能材料 ,2018年49(11):11052-11060 ISSN:1001-9731
通讯作者:
Hu, Y.
作者机构:
[胡云楚; 王文磊; 陈秋菊; 王琼] School of Science, Central South University of Forestry and Technology, Changsha, 410004, China;[马莉萍; 谢奇龙] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构:
[Hu, Y.] S;School of Science, China
关键词:
锌基量子点;合成;修饰;生物化学传感
摘要:
锌基量子点具有独特的光学特性、低毒性以及生物相容性好的优势,使锌基量子点在分析检测及生物标记中得到了广泛的应用。基于锌基量子点的研究进展,在阐述其合成方法、功能化修饰等基础上,系统论述了锌基量子点在生物化学传感领域的应用,并对其发展趋势和应用前景进行了展望。
语种:
中文
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Structure and spectroscopic study of aqueous Fe(III)-As(V) complexes using UV–Vis, XAS and DFT-TDDFT
作者:
Chai, Liyuan;Yang, Jinqin;Zhang, Ning;Wu, Pin-Jiun;Li, Qingzhu* ;...
期刊:
Chemosphere ,2017年182(Sep.):595-604 ISSN:0045-6535
通讯作者:
Li, Qingzhu
作者机构:
[Yang, Jinqin; Li, Qingzhu; Wang, Qingwei; Liu, Hui; Chai, Liyuan] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Li, Qingzhu; Wang, Qingwei; Liu, Hui; Chai, Liyuan] Chinese Natl Engn Res Ctr Control & Treatment Hea, Changsha 410083, Hunan, Peoples R China.;[Zhang, Ning] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Wu, Pin-Jiun] Natl Synchrotron Radiat Res Ctr, Ind Applicat Grp, Hsinchu 30076, Taiwan.;[Yi, Haibo] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
通讯机构:
[Li, Qingzhu] C;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
关键词:
Fe(III)-As(V) complexes;UV-Vis spectra;XAS;DFT-TDDFT
摘要:
Aqueous complexes between ferric (Fe(III)) and arsenate (As(V)) are indispensable for understanding the mobility of arsenic (As) in Fe(III)-As(V)-rich systems. In this study, aqueous Fe(III)-As(V) complexes, FeH2AsO42+ and FeHAsO4+, were postulated based on the qualitative analysis of UV-Vis spectra in both Fe(III)-As(V)-HClO4 and Fe(III)-As(V)-H2SO4 systems. Subsequently, monodentate structures were evidenced by Fe K-edge EXAFS and modeled as [FeH2AsO4(H2O)(5)](2+) and [FeHAsO4(H2O)(5)](+) by DFT. The feature band at similar to 280 nm was verified as electron excitation chiefly from Fe-As-bridged O atoms to d-orbital of Fe in [FeH2AsO4(H2O)(5)](2+) and [FeHAsO4(H2O)(5)](+). The structural and spectral information of Fe(III)-As(V) complexes will enable future speciation analysis in Fe(III)-As(V)-rich system. (C) 2017 Published by Elsevier Ltd.
语种:
英文
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顶空固相微萃取-气相色谱-质谱联用分析柚木光辐射前后的挥发性成分
作者:
文瑞芝;曾栋;黄自知;马强;王琼;...
期刊:
林产化学与工业 ,2017年37(1):135-140 ISSN:0253-2417
通讯作者:
Hu, Y.
作者机构:
[文瑞芝; 黄自知; 马强; 王琼; 胡云楚] College of Science, Central South University of Forestry & Technology, Changsha, 410004, China;[Zeng D.] Hunan Center of Disease Control and Prevention, Changsha, 410005, China
通讯机构:
College of Science, Central South University of Forestry & Technology, Changsha, China
关键词:
柚木;挥发性成分;光辐射;顶空固相微萃取
摘要:
采用顶空固相微萃取-气相色谱-质谱联用技术检测分析了柚木光辐射前后的挥发性成分,研究结果表明:从光辐射前后的柚木中共鉴定出80种挥发性成分,辐射前(原柚木)鉴定出57种挥发性成分,辐射60 h后的柚木中鉴定出53种挥发性成分,包括烃类、醇类、酚类、酯类、醛类、酮类、蒽醌类和胺类。光辐射后柚木未能检测到酮类,且醇类从12. 586%减少到7. 498%,醇类化合物由6种减少至3种,醛类从0. 404%增加到3. 653%,醛类化合物由3种增至5种。柚木光辐射前挥发性成分主要是2-甲基蒽醌(18. 443%) 、2-N-甲基-萘胺(14. 781%) 、邻苯二甲酸异丁基辛基酯(9. 567%) 、1,2,3-三甲基-4-丙烯基-(E)-萘(7. 513%) 、τ-杜松醇(4. 684%) 、α-杜松醇(3. 583%) 、柏木脑(3. 576%) 、1,2-邻苯二甲酸丁基异丁基酯(3. 213%)这8种化合物;辐照后除α-杜松醇和1,2-邻苯二甲酸丁基异丁基酯未能检测到外,增加了化合物1,2-邻苯二甲酸丁基环己基酯(3. 070%),且邻苯二甲酸异丁基辛基酯(11. 787%)有所增加,其余成分含量变化不大。醛类挥发性成分含有发色基团-CHO,醇类挥发性成分含有助色基团羟基-OH,而且光辐射后含量明显增加的挥发性成分都含有发色基团 -COO-,这些发色基团和助色基团的改变在柚木光变色中起到一定作用。
语种:
中文
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论分析化学实验教学中对学生数据处理能力的培养
作者:
王琼;文瑞芝;李水芳
期刊:
广东化工 ,2016年43(12):261-262 ISSN:1007-1865
作者机构:
中南林业科技大学理学院,湖南长沙,410004;[李水芳] 李水芳;[文瑞芝] 文瑞芝;[王琼] 王琼
关键词:
分析化学实验;数据处理;教学策略
摘要:
数据采集与处理是分析化学实验中的关键环节。文章从实验数据的采集、记录、处理及分析四个方面,以典型分析化学实验为例,总结了在实验教学中遇到的学生数据记录与结果处理的问题,进一步探讨了实验教师相对应的指导方案和教学策略。
语种:
中文
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浅谈有机化学实验教学改革
作者:
王琼;文瑞芝;李水芳
期刊:
长沙航空职业技术学院学报 ,2016年16(3):40-43 ISSN:1671-9654
作者机构:
中南林业科技大学理学院,湖南长沙,410018;[文瑞芝; 王琼; 李水芳] 中南林业科技大学
关键词:
有机化学实验;教学改革;能力培养
摘要:
有机化学实验对大学生化学知识和实验技能的培养有着至关重要的作用,就近年来有机化学实验教学中学生遇到的普遍问题进行总结,并提出了实验教师相对应的教改方案,以期全面提高学生的实践操作能力和创新性思维能力。
语种:
中文
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EXISTENCE OF POSITIVE PERIODIC SOLUTIONS FOR NEUTRAL POPULATION MODEL WITH DELAYS
作者:
Wang, Qi;Dai, Binxiang*
期刊:
生物数学学报:英文版 ,2008年01(01):107-120 ISSN:1793-5245
通讯作者:
Dai, Binxiang
作者机构:
[Wang, Qi] Cent S Univ, Sch Math Sci & Comp Technol, Changsha 410075, Hunan, Peoples R China.;[Dai, Binxiang] Cent S Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Dai, Binxiang] C;Cent S Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词:
Neutral population model;finite and infinite delays;k-set contractive operator;positive periodic solution
摘要:
In this paper, by using the theory of abstract continuous theorem of k-set contractive operator and some analysis techniques, we obtain some sufficient conditions for the existence of positive periodic solutions for a neutral population model.
语种:
英文
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Existence of positive periodic solutions for a neutral population model with delays and impulse
作者:
Wang, Qi;Dai, Binxiang*
期刊:
Nonlinear Analysis, Theory, Methods and Applications ,2008年69(11):3919-3930 ISSN:0362-546X
通讯作者:
Dai, Binxiang
作者机构:
[Wang, Qi] Cent S Univ, Sch Math Sci & Comp Technol, Changsha 410075, Hunan, Peoples R China.;[Dai, Binxiang] Cent S Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Dai, Binxiang] C;Cent S Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China.
关键词:
Neutral population model;finite and infinite delays;k-set contractive operator;positive periodic solution
摘要:
In this paper, by using the theory of abstract continuous theorem of k-set contractive operator and some analysis techniques, we obtain some sufficient conditions for the existence of positive periodic solutions for a neutral population model with delays and impulse. ©2007 Elsevier Ltd. All rights reserved.
语种:
英文
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