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Synthesis and Characterization of Chitosan-graft-Poly(lactic acid) Copolymer

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Chinese Journal of Polymer Science 2014年第1期32卷 43-50页

作者：牛旭锋 Feng tian Li-zhen Wang xiao-ming Li Gang Zhou 樊瑜波 Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University BUAA Research Institute

Chitosan-graft-poly（lactic acid）（CS-g-PLA） copolymer was synthesized through emulsion self-assembly in a water-in-oil （W/O） microemulsion. The water phase was composed of CS aqueous solution, while the oil phase was made up of PLA in chloroform. The W/O microemulsion was fabricated in the presence of surfactant span-80 and the self-assembly was performed between PLA and CS under the effect of N-（3-dimethylaminopropyl）-N＇ethylcarbodiimide hydrochloride （EDC＇HCI）. FTIR and IH-NMR analysis indicated PLA was grafted onto the backbone of CS via the reaction between the carboxyl groups in PLA and the amino groups in CS. 1H-NMR characterization further revealed the grafting content of PLA was 16%. The obtained CS-g-PLA could self-assemble to form micelles, their size distributed in the range of 125-375 nm with average diameter of 142 nm. The present design integrates the favorable biological properties of CS and the excellent mechanical properties of PLA, which makes CS-g-PLA copolymer a promising candidate as a carrier for targeted bioactive molecules delivery.

关键词： Poly(lactic acid) Chitosan Copolymer Self-assembling Grafting.

Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers

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Chinese Journal of Chemical Physics 2012年第6期25卷 636-641,I0003页

作者： Li-jing Gong Ying-hui Wang Zhi-hui Kang tian-hao Huang Ran Lu Han-zhuang Zhang College of Physics Jilin University Changchun 130012 China College of Chemistry Jilin University Changchun 130012 China Aviation University of Air Force Changchun 130022 China

We investigate the fluorene-vinylene unit dependent photo-physical properties of multi- branched truxene based oligomers （Tr-OFVn, n=1-4） employing steady-state absorption and emission spectroscopy, transient absorption spectroscopy, two-photon fluorescence, and z-scan technique. The results show that the increasing of fluorene-vinylene unit leads to a red-shift in the spectra of absorption and fluorescence, and shortens the excited state lifetime. Meanwhile, two-photon fluorescence efficiency and two-photon absorption cross section of truxene based oligolners gradually enhance in company with the extension of π- conjugated length. In addition, the values of two-photon absorption cross section modeled on the sum-over-state approach agree well with the experimental ones. The results indicate multi-branched truxene based oligomers bearing organic materials for two-photon applications.

关键词： Multi-branch oligomer Two-photo absorption Z-scan

Released energy formula for proton radioactivity based on the liquid-drop model

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Communications in Theoretical Physics 2021年第7期73卷 89-94页

作者： xiao Pan You-tian Zou Hong-Ming Liu Biao He xiao-Hua Li Dong Xiang School of Nuclear Science and Technology University of South ChinaHengyang 421001China College of Physics and Electronics Central South UniversityChangsha 410083China National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Q_(p)).The parameters of this formula are obtained by fitting the experimental data of 29 nuclei with proton radioactivity from ground *** standard deviation between the theoretical values and experimental ones is only 0.157 Me *** addition,we extend this formula to calculate 51 proton radioactivity candidates in region 51≤Z≤83 taken from the latest evaluated atomic mass table AME2016 and compared with the Q_(p)calculated by WS4 and *** calculated results indicate that the evaluation ability of this formula for Q_(p)is inferior to WS4 while better than HFB-29.

关键词： the released energy of proton radioactivity liquid-drop model shell correction

A high-efficiency separation process of Fe and Zn from zinc-bearing dust by direct reduction

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Journal of Iron and Steel Research International 2022年第10期29卷 1559-1572页

作者： Ding-zheng Wang De-qing Zhu Jian Pan Zheng-qi Guo Hong-yu tian Yu-xiao Xue School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina

It is urgent to dispose of zinc-bearing dust from steel plants,and direct reduction process is an effective method to remove hazardous metals and recycle iron from the *** reduction behavior of carbon-containing pellets which were made from three kinds of zinc-bearing dust was *** the pellets were reduced at 1200℃ for 50 min,the reduced pellets with cold compressive strength of 1164 N pellet−1 and Zn content<0.1 wt.%could be directly used as burden for improving the blast furnace operation without further *** results of isothermal kinetic study showed that the iron oxide reduction rate was controlled by the chemical *** strengthening mechanism of reduced pellets and iron oxide reduction mechanism was investigated by thermodynamic calculation besides X-ray diffraction,scanning electron microscopy combined with energy dispersive spectrometry,and optical microscopy *** was found that higher temperatures are required for the reduction of spinel phase(zinc ferrite)and olivine phase(hedenbergite).The generation and growth of metallic iron bridges could significantly increase the compressive strength of reduced *** iron oxide reduction in the carbon-containing pellets followed the uniform internal reduction model and possessed a high apparent reaction rate,which can improve energy utilization rate and production efficiency.

关键词： Zinc-bearing dust Reduction mechanism Kinetics High efficiency Direct reduction

The role of leptin in striped hamsters subjected to food restriction and refeeding

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Zoological Research 2014年第4期35卷 262-271页

作者： Zhi-Jun ZHAO Yong-An LIU jing-Ya XING Mao-Lun ZHANG xiao-Ying NI jing CAO College of Life and Environmental Science Wenzhou University Wenzhou 325027 China School of Agricultural Science Liaocheng University Liaocheng 252059 China

Food restriction （FR） and refeeding （Re） have been suggested to impair body mass regulation and thereby making it easier to regain the lost weight and develop over-weight when FR ends. However, it is unclear if this is the case in small mammals showing seasonal forging behaviors. In the present study, energy budget, body fat and serum leptin level were measured in striped hamsters that were exposed to FR-Re. The effects of leptin on food intake, body fat and genes expressions of several hypothalamus neuropeptides were determined. Body mass, fat content and serum leptin level decreased during FR and then increased during Re. Leptin supplement significantly attenuated the increase in food intake during Re, decreased genes expressions of neuropepetide Y （NPY） and agouti-related protein （AgRP） of hypothalamus and leptin of white adipose tissue （WAT）. Hormone-sensitive lipase （HSL） gene expression of WAT increased in leptin-treated hamsters that were fed ad libitum, but decreased in FR-Re hamsters. This indicates that the adaptive regulation of WAT HSL gene expression may be involved in the mobilization of fat storage during Re, which partly contributes to the resistance to FR-Re-induced overweight. Leptin may be involved in the down regulations of hypothalamus orexigenic peptides gene expression and consequently plays a crucial role in controlling food intake when FR ends.

关键词： Body mass Food restriction Hypothalarnus neuropeptides Leptin Striped hamster

Origanum vulgare *** extract alleviates finasteride-induced oxidative stress in mouse liver and kidney

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Asian Pacific Journal of Tropical Biomedicine 2021年第5期11卷 194-204页

作者： Qi-Feng Sun Shi-Xiang Chen Zhang-Feng Tang xiao-Yi Song Fa jing Hao-tian Wu Zhong-Yang Ding Attalla El-kott Diaa Massoud Heba Khalifa Department of Hepatobiliary and Vascular Surgery Jinan City People's HospitalJinanShandong Province271100China Department of Hepatology Zhejiang University Ming Zhou HospitalNingboZhejiang Province315199China Department of General Surgery Wuxi Traditional Chinese Medicine Hospital Affiliated to Nanjing University of Traditional Chinese MedicineWuxiJiangsu Province214023China Biology Department College of ScienceKing Khalid UniversityAbhaSaudi Arabia Zoology Department College of ScienceDamanhour UniversityDamanhourEgypt Biology Department College of ScienceJouf UniversityP.O.Box 2014SakakaAl-JoufSaudi Arabia Zoology Department Faculty of ScienceFayoum UniversityFayoumEgypt

Objective:To investigate the hepatorenoprotective effects of Origanum vulgare *** finasteride-induced oxidative injury in the liver and kidney of ***:Liquid chromatography-electrospray ionization-tandem mass spectrometry(LC-ESI/MS)analysis was utilized to yield a fingerprint of Origanum vulgare polyphenolic *** BALB/c mice received 0.5 mL/day distilled water,finasteride(25 mg/kg/day for 10 d),and 100,200,or 400 mg/kg/day finasteride+Origanum vulgare extract with 6 mice per group for five *** day 36,liver and kidney function as well as pro-and antiinflammatory(IFN-γ,IL-12,IL-6,TNF-α,IL-1β,and IL-10)cytokines were *** total antioxidant status,nitric oxide(NO),and malondialdehyde levels as well as the activities of NO synthase and catalase were also *** study was conducted to assess the effect of Origanum vulgare extract on finasteride-induced renal and hepatic ***:Twenty-five major polyphenolic compounds were identified in the Origanum vulgare extract by LC-ESI/*** vulgare extract,especially at 200 and 400 mg/kg/day doses,significantly improved liver and kidney biochemical indices,decreased inflammatory cytokines,increased total antioxidant status and NO synthase and catalase activities,as well as decreased plasma NO and malondialdehyde levels in a dose-dependent manner as compared to the finasteride *** results further confirmed the protective effect of Origanum vulgare ***:Origanum vulgare extract ameliorates finasterideinduced hepatic and renal biochemical and histopathological alterations,and restores antioxidant/oxidant balance.

关键词： Kidney Liver Origanum vulgare L. Inflammation Antioxidant

补肾活血方对抗心磷脂抗体致复发性流产大鼠的治疗效果

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中华医院感染学杂志 2024年第12期34卷 1849-1854页

作者：宋艳丽石少琦崔天薇何东杰肖惠冬子卫爱武河南中医药大学第一附属医院生殖医学科河南郑州450002

目的探讨补肾活血方对抗心磷脂抗体(aCL)致复发性流产(RSA)大鼠的治疗效果及对血小板/嘌呤能离子通道型7(P2X7)/Nod样受体蛋白3(NLRP3)炎症小体通路的影响.方法随机将受孕大鼠24只,分为aCL-RSA、aCL-RSA+低分子肝素组、aCL-RSA+丹寿汤... 详细信息

目的探讨补肾活血方对抗心磷脂抗体(aCL)致复发性流产(RSA)大鼠的治疗效果及对血小板/嘌呤能离子通道型7(P2X7)/Nod样受体蛋白3(NLRP3)炎症小体通路的影响.方法随机将受孕大鼠24只,分为aCL-RSA、aCL-RSA+低分子肝素组、aCL-RSA+丹寿汤组、模型组,每组6只;建立aCL-RSA孕鼠模型,给予补肾活血方干预,观察16天孕鼠体质量,孕鼠胚胎吸收率,胎鼠体质量;检测大鼠血浆血小板活化因子受体(PAFR)、血小板第4因子(PF4)含量,大鼠胎盘组织中白细胞介素-1β(IL-1β)、IL-18含量,HE染色检测胎盘组织病理学改变,TUNEL染色法检测胎盘组织中细胞凋亡;Western Blot检测cleaved caspase-1、人细胞凋亡相关斑点样蛋白(ASC)、NLRP3、Bcl2、Bax、cleaved caspase-3、嘌呤能离子通道型7(P2X7)蛋白的表达,探讨aPL致复发性流产与血小板活化、NLRP3炎症小体通路及P2X7的相关性,及丹寿汤对aCL-RSA孕鼠的影响及对血小板活化/P2X7/NLRP3通路的影响.结果与模型组比较,aCL-RSA组能明显降低孕鼠体质量,增加孕鼠胚胎吸收率,降低胎鼠体质量,增加血浆PAFR、PF4含量(P<0.05);aCL-RSA组胎盘组织迷宫区母性红细胞较少,较多血栓形成,胎盘血窦空间明显减小;胎盘组织中凋亡细胞数目明显增加,胎盘组织中IL-1β、IL-18增加,胎盘组织中cleaved caspase-1、ASC、NLRP3、Bax、cleaved caspase-3、P2X7蛋白表达增加(P<0.05),Bcl2蛋白水平降低(P<0.05).结论补肾活血方能抑制血小板活化,下调P2X7的表达,抑制NLRP3的激活,减轻胎盘的高凝、炎症状态进而减少aCL-RSA的发生.

关键词：补肾活血方抗心磷脂抗体复发性流产血小板/P2X7/NLRP3炎症小体通路

基于SNP芯片分析贵州地方鸡品种(类群)的遗传多样性

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南方农业学报 2024年第5期55卷 1444-1453页

作者：周晓红陈大海吴胜田应平潘成勇张福平贵州大学动物科学学院/高原山地动物遗传育种与繁殖教育部重点实验室贵州贵阳550025 贵州大学科研鸡场贵州贵阳550027 凯里市凤凰苑畜禽养殖有限公司贵州黔东南556000

【目的】了解贵州地方鸡品种遗传多样性及确定品种间的遗传关系,为贵州地方鸡品种(类群)资源的保护和创新利用提供参考依据。【方法】采集香炉山鸡(SL)、瑶山鸡(YS)、黔东南小香鸡(XX)和威宁鸡(WN)共66份血液样本,基于京芯一号鸡55K SN... 详细信息

【目的】了解贵州地方鸡品种遗传多样性及确定品种间的遗传关系,为贵州地方鸡品种(类群)资源的保护和创新利用提供参考依据。【方法】采集香炉山鸡(SL)、瑶山鸡(YS)、黔东南小香鸡(XX)和威宁鸡(WN)共66份血液样本,基于京芯一号鸡55K SNP芯片对4个贵州地方鸡品种(类群)进行SNP位点检测,采用Plink v1.90、VCFtools v0.1.17和Admixture v1.3分别进行遗传多样性、群体结构及亲缘关系分析。【结果】4个贵州地方鸡品种(类群)的有效群体含量(Ne)介于3.1~3.2,且期望杂合度(He)均低于观察杂合度(Ho),多态信息含量(PIC)排序为威宁鸡(0.8583)>瑶山鸡(0.8350)>黔东南小香鸡(0.8123)>香炉山鸡(0.8001),均大于0.50,呈高度多态性,遗传多样性丰富。基于状态同源(IBS)遗传距离矩阵构建的系统发育进化树显示,香炉山鸡的分支最长、威宁鸡的分支最短。主成分分析(PCA)结果表明,4个贵州地方鸡品种(类群)间的界限分明,且各品种(类群)间无相互渗透现象;在Admixture祖代分析中,祖先集群数量(K)=2时,群体分群效果最佳,说明4个贵州地方鸡品种(类群)有2个共同的祖先。4个贵州地方鸡品种(类群)间的群体分化系数(Fst)接近0.05,说明群体间并未产生明显分化。4个贵州地方鸡品种(类群)的G矩阵亲缘关系分析结果和IBS遗传距离分析结果一致,香炉山鸡群个体间的亲缘关系和遗传距离最近,而威宁鸡群个体间的亲缘关系和遗传距离最远。【结论】4个贵州地方鸡品种(类群)遗传多样性较丰富,且品种(类群)间的界限明显,无相互渗透现象,但亲缘关系中有部分品种(类群)间存在近交风险,因此今后的育种工作应进一步改良香炉山鸡和黔东南小香鸡的配种方式,并适当增加群体数量及公母比例,以避免近交衰退。

关键词：贵州地方鸡 SNP芯片群体结构遗传多样性亲缘关系

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考虑多种工业负荷参与的多时间尺度源荷储优化调度

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科学技术与工程 2024年第15期24卷 6290-6299页

作者：王小庆王海云范添圆闫斯哲郑红娟新疆大学可再生能源发电与并网控制教育部工程研究中心乌鲁木齐830047 浙江大学电气工程学院杭州310027 国电南瑞科技股份有限公司南京211106

为解决大规模新能源接入导致传统电网中常规机组调节压力不断增大的问题,提出了一种考虑储能和多种工业负荷参与的多时间尺度优化调度策略。该策略通过协调荷侧电解铝、水泥、钢铁、非生产性负荷与储能以及源侧常规机组调用计划,有效缓... 详细信息

为解决大规模新能源接入导致传统电网中常规机组调节压力不断增大的问题,提出了一种考虑储能和多种工业负荷参与的多时间尺度优化调度策略。该策略通过协调荷侧电解铝、水泥、钢铁、非生产性负荷与储能以及源侧常规机组调用计划,有效缓解电网调节压力。首先,分析储能和多种工业负荷的调节特性,建立风-光-荷-储的滚动调节框架。然后,针对源荷不确定性,采用多场景随机规划与模糊机会约束目标规划相结合的方法,建立日前和日内阶段以系统经济性最优为目标、实时调度阶段兼顾安全性和经济性的多时间尺度调度模型。最后,通过新能源充足与不足典型日算例可知,本文所提调度策略能够充分发挥可调控资源的调节能力,在两种典型日的总成本较日前最优调度分别降低了17.08%、44.13%,弃新能源量降低39%、失负荷量降低23%,有效提高了电网运行经济性和安全性。

关键词：工业负荷储能多时间尺度多场景随机规划模糊机会约束目标规划