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CoFe_(2)O_(4) decorated graphene/C_(18)-functionalized mesoporous silica nanocomposites prepared for magnetic enrichment and electrochemical detection of promethazine in beef

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Chinese Chemical Letters 2024年第3期35卷 208-213页

作者： Xingdong Yang Shi-Ming Ying Sen Zhang Jinxia Dai Wei Gao Tian-Qi Wang Jun-qin qiao Hong-Zhen Lian Li Mao State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry&Chemical Engineering and Centre of Materials AnalysisNanjing UniversityNanjing 210023China Ministry of Education(MOE)Key Laboratory of Modern Toxicology School of Public HealthNanjing Medical UniversityNanjing 211166China

Promethazine(PHZ)is used as a sedative in veterinary medicine,and its residue can threaten the health of human.The electrochemical detection of PHZ is suitable method for application in the field.However,the traditional electroanalysis is difficult to perform directly in meat samples due to matrix interference.This work integrates magnetic solid-phase extraction and differential pulse voltammetry for highly sensitive and selective determination of PHZ in beef and beef liver for the first time.CoFe_(2)O_(4)/graphene coated with C_(18)-functionalized mesoporous silica(MG@mSiO_(2)-C_(18))is synthesized as dispersed magnetic adsorbent to extract PHZ.Magnetic glassy carbon electrode modified with nitrogen-doped hollow carbon microspheres(HCM)attracts the MG@mSiO_(2)-C_(18)with PHZ,and directly detects the PHZ without elution procedure.MG@mSiO_(2)-C_(18)can separate PHZ to avoid the interference of impurities on following detection,and also concentrate PHZ on magnetic electrode.Additionally,the electrode modification with HCM can amplify the electrochemical signal of PHZ.Finally,the integrated PHZ determination method exhibits a wide linear range from 0.08μmol/L to 300μmol/L with a low limit of detection of 9.8 nmol/L.The beef sample analysis presents excellent recovery,demonstrating that this protocol is promising for the rapid and onsite detection of PHZ in real meat samples。

关键词： Promethazine(PHZ) Drug residue Magnetic solid phase extraction Electrochemical detection Beef

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The Development of Khorgas Port in Xinjiang, China and Its Effect on Surrounding Towns

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Chinese Geographical Science 2023年第3期33卷 458-473页

作者： DONG Junxi LIU Hanchu ZHAO Yannan CHEN Dong qiao qin FAN Jie School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Institute of Science and Development Chinese Academy of SciencesBeijing 100190China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Chinese Research Academy of Environmental Sciences Institute of EcologyBeijing 100049China

The sustainable development of border port-cities is of considerable significance to the stabilization and consolidation of border areas,unlike coastal-ports cities that consist of coastal ports and cities.Border ports should continue to drive the development of their surrounding towns to provide high-quality living conditions,employment,and housing for inhabitants of such towns and enhance the population agglomeration capacity of border areas.This study aimed to analyze the structure of employment and settlement in the cities surrounding the Khorgas Port at the different stages of its development—employing semi-structured interviews with individuals to analyze the spatial orientation characteristics of the daily needs of different groups of people and reveal the ways in which border ports drive the development of their surrounding towns—and recommend ways in which this can be improved.This study finds that as the Khorgas Port’s mutual trade market,industrial base,comprehensive management,and other functions continue to grow,the port is becoming increasingly important.As more people work and settl in the surrounding towns,their living needs also increase.However,a considerable number of employed people do not live nearby,and many living needs are not being addressed in the towns surrounding the port.The study also reveals the living services demands of government management personnel who work at the port on weekdays and return to Yining City on weekends,employees of industrial enterprises who work at the port and return home for the New Year’s celebration,and government management personnel and individual business personnel who work at the port and live nearby.In the future,the focus should be on improving the living conditions of the inhabitants of the towns surrounding Khorgas Port,including public services and the settlement ability of employees of industrial enterprises to better realize the radiation drive of the port on the surrounding towns.

关键词： return services coastal

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The anti-proliferative activity and cellular antioxidant activity of oenothein B and its content in different Eucalyptus species and region

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未来食品学报(英文) 2023年第4期3卷 392-398页

作者： Yunjiao Chen qiao qin Hongzhang Chen qingrong Huang Mingyue Song Suyao Xiao Longbipei Cao Yong Cao Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods College of Food ScienceSouth China Agricultural UniversityGuangzhou 510642China Infinitus(China)Company Ltd. Jiangmen 510180China Department of Food Science Rutgers UniversityNew Brunswick 08901USA

The leaves of Eucalyptus are abundant in natural resources as a novel potential antioxidant and have broad market prospect.Four of characteristic hydrolysable tannins from Eucalyptus leaves have been demonstrated great application potential as natural antioxidants in our previous research.In this study,the bioactive activities of another hydrolysable tannin isolated and identified as oenothein B(OEB)were evaluated.Content of bioactive compound(hydrolysable tannin)from different Eucalyptus species and regions in southern China were investigated.The results showed that OEB not only exerted anti-proliferative activity against HepG2 cell,but also showed higher cellular antioxidant activity than some common antioxidants.Generally,content of characteristic hydrolysable tannins decreased in the order of OEB>tellimagrandin I(T1)>pedunculagin>gemin D>pentagalloyl glucose(PGG).E.grandis×E.urophylla GL9 and E.urophylla×E.grandis could be recommended as new natural sources to exploit hydrolysable tannins because of high content,widely plantation and strong adaptability.This study supplied first insight on introduction of high cellular antioxidant activity of OEB and selecting the species and region to exploit natural antioxidants.It will promote the increasing of economic value of Eucalyptus.

关键词： Eucalyptus polyphenols Cellular antioxidant activity Hydrolysable tannins Oenothein B(OEB)

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新媒体视域下短视频语言运用研究——以旅行博主为例

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艺术科技 2024年第5期37卷 100-102页

作者：秦侨扬州大学文学院江苏扬州225009

目的:在互联网和新媒体飞速发展的时代,短视频已逐渐成为最受欢迎的信息传递工具之一。特别是在旅游领域,旅行博主通过短视频分享他们的旅行经历、攻略,甚至传递生活理念。文章以旅行博主的短视频为研究对象,研究新媒体视域下短视频的... 详细信息

目的:在互联网和新媒体飞速发展的时代,短视频已逐渐成为最受欢迎的信息传递工具之一。特别是在旅游领域,旅行博主通过短视频分享他们的旅行经历、攻略,甚至传递生活理念。文章以旅行博主的短视频为研究对象,研究新媒体视域下短视频的语言运用。方法:在众多的旅行类博主中,选择“房琪kiki”“皮皮在蓝色星球”“牛肉夫妻出逃记”这三位博主作为代表性研究对象。从特殊到一般,深入分析代表性博主短视频的语言文本,并探寻其表达形式与内容之间的内在联系。结果:短视频旅行博主使用的语言不仅要具有个性特点,还需要在表达方式和传播策略上有所创新,以吸引观众并与其互动。短视频创作特点主要体现在创新的表达方式、个性化的叙事风格以及富有吸引力的内容设计等方面。这些特点不仅满足了受众的多样化需求,还使有效的信息传递成为可能。结论:旅行是一种寻找自我与探索世界的方式,与对短视频创作深度与广度的追求之间存在对应关系。旅行博主运用丰富多样的语言策略,成功吸引观众并提升自身的影响力,其制作的旅行短视频给观众带来了视觉与听觉上的享受。

关键词：新媒体短视频语言运用旅行博主

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缅甸抹谷紫方钠石光致变色效应脱色效率研究

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岩石矿物学杂志 2024年第3期43卷 518-524页

作者：汤峻陈洋铃郭颖贺晴覃侨红中国地质大学(北京)珠宝学院北京100083 亚洲宝石学院(中国) 广东深圳518000

光致变色效应是紫方钠石最显著且极具价值的光学特征。本文通过EDXRF、FTIR、UV-VIS-NIR、D65标准光源、照度计以及色度学方法,对缅甸抹谷紫方钠石光致变色效应脱色效率进行了定量研究。紫方钠石的主量元素为Na、Al、Si和O,此外含有少... 详细信息

光致变色效应是紫方钠石最显著且极具价值的光学特征。本文通过EDXRF、FTIR、UV-VIS-NIR、D65标准光源、照度计以及色度学方法,对缅甸抹谷紫方钠石光致变色效应脱色效率进行了定量研究。紫方钠石的主量元素为Na、Al、Si和O,此外含有少量Cl和S,微量元素可含Ca、K和Fe, UV-VIS-NIR光谱存在472、540和667 nm的3个吸收峰,其中以540 nm吸收强度最大,脱色过程中,其光谱吸收峰峰位不变,但强度随时间逐渐减小,540 nm吸收峰面积在0~80 s与时间呈线性负相关(R^(2)=0.99);脱色过程中,当照度从5 000 lx升高至30 000 lx时,紫方钠石脱色效率明显升高,明度L^(*)升高,彩度C^(*)降低,色品a^(*)降低且色品b^(*)升高,色调由紫色向粉色调轻微变化,是电荷转移导致F中心被破坏的直接结果。

关键词：紫方钠石光致变色色度学脱色效率

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粪菌移植治疗成人超重/肥胖病人有效性与安全性的Meta分析

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肠外与肠内营养 2024年第1期31卷 27-35页

作者：乔亚琴沈海涛侯有奎路燕安徽医科大学第二附属医院消化内科安徽合肥230601 西安航天总医院消化内科陕西西安710199

目的:系统评价粪菌移植(FMT)治疗成人超重/肥胖病人的有效性与安全性。方法:对Pubmed、Embase、Cochrane Library、Web of Science、知网、维普、万方、中国生物医学数据库进行系统检索,检索时限为自建库起至2024年1月23日。按照纳入和... 详细信息

目的:系统评价粪菌移植(FMT)治疗成人超重/肥胖病人的有效性与安全性。方法:对Pubmed、Embase、Cochrane Library、Web of Science、知网、维普、万方、中国生物医学数据库进行系统检索,检索时限为自建库起至2024年1月23日。按照纳入和排除标准进行文献筛选和数据提取,采用RevMan 5.4软件进行Meta分析及质量评价。结果:最终纳入8篇随机对照试验(RCT),共201名病人。Meta分析结果显示:与对照组相比,试验组能降低超重/肥胖成人病人的甘油三脂水平[MD=-0.25,95%CI:-0.44~-0.07,P <0.01],升高高密度脂蛋白(HDL)水平[MD=0.09,95%CI:0.02~0.16,P=0.01]。但试验组和对照组身体质量指数(BMI)[MD=-0.77,95%CI:-1.56~0.03,P=0.06]、体质量[MD=1.24,95%CI:-5.43~7.91,P=0.71]、总胆固醇[MD=-0.2,95%CI:-0.55~0.15,P=0.26]、低密度脂蛋白(LDL)[MD=-0.05,95%CI:-0.51~0.41,P=0.83]、空腹血糖(FBG)[MD=0.01,95%CI:-0.14~0.16,P=0.91]及糖化血红蛋白(HbA1c)[MD=-0.05,95%CI:-0.23~0.13,P=0.58]比较,差异无统计学意义。FMT不良反应主要表现为胃肠道症状且均较轻。结论:FMT对成人超重/肥胖病人的BMI、体质量、总胆固醇、LDL、FBG及HbA1c水平无明显作用,仅对甘油三脂及HDL有一定改善,但在短期内相对安全。为阐明FMT在成人超重/肥胖中的作用,必须进行更多、样本量更大的研究。

关键词：粪菌移植超重肥胖 Meta分析

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极小种群野生植物朱红大杜鹃的种群结构与动态特征

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西部林业科学 2024年第1期53卷 17-24页

作者：朱培高乔琴马永鹏刘德团云南大学资源植物研究院云南昆明650504 云南农业大学园林园艺学院云南昆明650201 中国科学院昆明植物研究所云南省极小种群野生植物综合保护重点实验室云南昆明650201

朱红大杜鹃是中国极小种群野生植物,也是国家二级重点保护野生植物。为了厘清朱红大杜鹃的群落特征,评估其种群的生存潜力,通过样地调查,分析群落物种组成,编制静态生命表,研究朱红大杜鹃的径级结构、种群动态。结果显示:(1)样方中重要... 详细信息

朱红大杜鹃是中国极小种群野生植物,也是国家二级重点保护野生植物。为了厘清朱红大杜鹃的群落特征,评估其种群的生存潜力,通过样地调查,分析群落物种组成,编制静态生命表,研究朱红大杜鹃的径级结构、种群动态。结果显示:(1)样方中重要值>1%的木本植物有17种,其中窄叶青冈、白穗石栎、云南越桔和云南松为群落优势种。(2)朱红大杜鹃种群第Ⅱ龄级个体数量最多,占总体数量的17.06%,各龄级的个体数量随着龄级的增加先增加后减少,种群径级结构呈“纺锤”型,种群年龄结构属于衰退型。(3)朱红大杜鹃存活曲线趋近DeeveyⅠ型分布,种群的死亡高峰出现在X龄级,死亡率为40%,种群动态变化指数(V_(pi))和受外界干扰种群动态变化指数(V′_(pi))均大于0,但V′_(pi)较小,种群在外部环境干扰下承担的风险概率最大值(P_(max))为0.07%,说明该种群受外界随机干扰时增长趋势不明显。建议对朱红大杜鹃种群进行就地保护,以提高幼苗和小树的存活率,促进种群的自然更新和恢复。

关键词：朱红大杜鹃种群年龄结构静态生命表存活曲线动态分析

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Comparison of Two Chinese Versions of Pride and Prejudice

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Journal of Contemporary Educational Research 2020年第11期4卷 100-103页

作者： qiao qin Chongqing Nonnal University Chongqing 401331China

Pride and Prejudice is the second published and the most attractive novel of Jane Austin.This paper compares Wang Keyi's version and Sun Zhili's version of Pride and Prejudice and points out the characteristics of the two different versions.This paper attempts to study what translation methods the two translators adopted,the differences between the two versions and the reason why the differences exist.

关键词： Pride and Prejudice Comparison of Two Versions Differences

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含铝灰聚氨酯导热结构胶的制备与性能

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广州化学 2024年第3期49卷 57-60,I0003页

作者：覃巧吴育南靳焘中国科学院广州化学研究所广东广州510650 中国科学院大学北京100049 中科检测技术服务(广州)股份有限公司广东广州510650 中国科学院新型特种精细化学品工程实验室广东广州510650 国科广化韶关新材料研究院广东南雄512400 国科广化(南雄)新材料研究院有限公司广东南雄512400

以蓖麻油、IPDI、聚天门冬氨酸酯树脂以及聚四氢呋喃二醇为主要原料,制备了双组份无溶剂聚氨酯胶粘剂。以铝灰作为填料加入聚氨酯胶粘剂中,实现了铝灰的资源化回收利用。对产物进行红外表征,证明了蓖麻油成功引入聚氨酯长链上。研究结... 详细信息

以蓖麻油、IPDI、聚天门冬氨酸酯树脂以及聚四氢呋喃二醇为主要原料,制备了双组份无溶剂聚氨酯胶粘剂。以铝灰作为填料加入聚氨酯胶粘剂中,实现了铝灰的资源化回收利用。对产物进行红外表征,证明了蓖麻油成功引入聚氨酯长链上。研究结果表明:随着铝灰含量的增加,导热系数逐渐提高;拉伸强度整体呈现先下降再上升的趋势;当铝灰填料添加量在50%时,钢材剪切强度为6.43 MPa,拉伸强度为7.71 MPa,断裂伸长率为27.2%,导热系数可达到0.41W/(m·K),为空白对照组的228%。

关键词：聚氨酯胶粘剂蓖麻油铝灰聚天门冬氨酸酯聚四氢呋喃二醇

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Differential microRNA expression between shoots and rhizomes in Oryza longistaminata using high-throughput RNA sequencing

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The Crop Journal 2014年第Z1期2卷 102-109页

作者： Ying Zong Liyu Huang Ting Zhang qiao qin Wensheng Wang Xiuqin Zhao Fengyi Hu Binying Fu Zhikang Li Institute of Crop Science/National Key Facility for Crop Gene Resources and Genetic Improvement Chinese Academy of Agricultural Sciences Food Crops Research Institute Yunnan Academy of Agricultural Sciences

Plant microRNAs(miRNAs)play important roles in biological processes such as development and stress responses.Although the diverse functions of miRNAs in model organisms have been well studied,their function in wild rice is poorly understood.In this study,high-throughput small RNA sequencing was performed to characterize tissue-specific transcriptomes in Oryza longistaminata.A total of 603 miRNAs,380 known rice miRNAs,72 conserved plant miRNAs,and151 predicted novel miRNAs were identified as being expressed in aerial shoots and rhizomes.Additionally,99 and 79 miRNAs were expressed exclusively or differentially,respectively,in the two tissues,and 144 potential targets were predicted for the differentially expressed miRNAs in the rhizomes.Functional annotation of these targets suggested that transcription factors,including squamosa promoter binding proteins and auxin response factors,function in rhizome growth and development.The expression levels of several miRNAs and target genes in the rhizomes were quantified by RT-PCR,and the results indicated the existence of complex regulatory mechanisms between the miRNAs and their targets.Eight target cleavage sites were verified by RNA ligase-mediated rapid 5′end amplification.These results provide valuable information on the composition,expression and function of miRNAs in O.longistaminata,and will aid in understanding the molecular mechanisms of rhizome development.

关键词： Oryza longistaminata Deep sequencing miRNA Quantitative RT-PCR

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