检索结果-南通市图书馆

Phytochemical analyses, antimicrobial and antioxidant activities of stem bark extracts of Distemonanthus benthamianus H. Baill. and fruit extracts of Solanum torvum Sw. from Gabon

引用

Asian Pacific Journal of Tropical Biomedicine 2019年第5期9卷 209-216页

作者： cédric sima obiang Rick Léonid Ngoua Meye Misso Guy Roger Ndong Atome Joseph Privat Ondo Louis clément Obame Engonga Edouard Nsi Emvo Laboratory of Research in Biochemistry University of Sciences and Technology of Masuku Laboratory of Natural Substances and Organometallic Synthesis University of Sciences and Technology of Masuku

Objective: To evaluate the phytochemical constituents, antimicrobial and antioxidant activities of the extracts of Distemonanthus benthamianus(D. benthamianus) stem bark and Solanum torvum(S. torvum) fruit which have been used as traditional medicinal herbs in Gabon. Methods: Plant extracts were subjected to a qualitative study(phytochemical screening) and a quantitative(dosing) study of secondary metabolites. Antioxidant activity was tested by 1,1-diphenyl-2-picrylhydrazyl and 2,2'-azino-bis 3-ethylbenzothiazoline-6-sulfonic acid assay. Bacteria and fungi susceptibility tests were performed on Mueller Hinton medium and solid Sabouraud, respectively, using the diffusion method, while minimum inhibitory concentration, minimum fungicidal concentration and minimum bactericidal concentration were evaluated by microdilution ***: The total phenol and tannin contents were significantly higher in the water-ethanol extract compared to the other extracts of D. benthamianus and S. torvum. The water-ethanol and water-acetone extracts showed significantly higher antioxidant activity than the aqueous extracts of the two medicinal plants. However, the extracts presented weak antioxidant activities compared to standards(Vitamin c, BHA). The water-acetone and water-ethanol extracts of S. torvum showed the highest antimicrobial activity against Bacillus cereus LMG 13569 BHI, Shigella dysenteriae 5451 cIP, Shigella dysenteriae and Neisseria gonorrhoeae. conclusions: Our results show that D. benthamianus and S. torvum can be promising sources of natural products with potential antimicrobial and antioxidant activities.

关键词： Antioxidants Phytochemical Antimicrobial Distemonanthus benthamianus Solanum torvum

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

Prevalence and Risk Factors Associated with Tungiasis among School-Aged children in the city of Port Gentil, Ogooué-Maritime Province, Gabon in central Africa

引用

Journal of Biosciences and Medicines 2022年第11期10卷 176-191页

作者： Thiéry Ndong Mba cédric sima obiang Hilaire Moundounga Kenguele Arnaud Brice Pambo-Pambo Adelaïde Niéguitsila Armel Obiandong Eyivono Ulrich Nzamba cyrille Bisseye Patrick Mickala Laboratory of Molecular and cellular Biology (LABMc) University of Science and Technology of Masuku (USTM) Franceville Gabon Laboratory of Research in Biochemistry (LAREBIO) University of Sciences and Techniques of Masuku (USTM) Franceville Gabon Laboratory of Animal Physiology University of Science and Technology of Masuku (USTM) Franceville Gabon Laboratory of Multidisciplinary Research in Environment (LARME) University of Science and Technology of Masuku (USTM) Franceville Gabon

Background: Tungiasis is a skin infestation caused by the female sand flea called Tunga penetrans. Associated with a significant morbidity, this ectoparasite is present in all tropical regions, such as Gabon. Unfortunately, in this country, no study has ever been undertaken on this disease. However, in both urban and rural areas of this country, it causes disfigurement and mutilation of the feet or hands in infested persons, and is sometimes responsible for the school dropout of many children. It is in this context that this timely and relevant research was conducted to assess the prevalence and risk factors associated with Tungiasis in school-aged children in the city of Port Gentil, Ogooué-Maritime province, Gabon in central Africa. Materials and Methods: This prospective and cross-sectional study took place from May 22 to August 18, 2022, in two popular and underprivileged neighborhoods of the city of Port Gentil. It consisted of a physical diagnosis of the participants, and with the help of a questionnaire submitted to their parents/guardians, numerous data were collected. Entered into an Excel 2016 spreadsheet, the data were exported to the R software in its R commander interface, for two types of analyses. A univariate and a multivariate analysis, using logistic regression, first on socio-demographic characteristics and then on habitual and environmental behavioral characteristics, was performed and the variables in this analysis reported odds ratios and their 95% confidence intervals. The results were statistically significant at p Results: A total of 637 school-aged children with a mean age of 12.73 years and a standard deviation of 5.44, were registered and examined for this study. Among them, Tunga penetrans infestation was found in 242 children, indicating an overall prevalence of 37.99% (95% cI [0.34 - 0.41]). Univariate and multivariate analyses, using logistic regression, first according to socio-demographic characteristics and then according to risk f

关键词： Prevalence Risk Factors Tungiasis School-Aged children Port Gentil Ogooué-Maritime Gabon

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

Analysis of Gc×Gc fingerprints from medicinal materials using a novel contour detection algorithm:A case of curcuma wenyujin

引用

Journal of Pharmaceutical Analysis 2024年第4期14卷 542-551页

作者： Xinyue Yang Yingyu sima Xuhuai Luo Yaping Li Min He Department of Pharmaceutical Engineering School of Chemical EngineeringXiangtan UniversityXiangtanHunan411105China Molecular Science and Biomedicine Laboratory(MBL) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringAptamer Engineering Center of Hunan ProvinceHunan UniversityChangsha410082China Department of Quality control Xiangtan Central HospitalXiangtanHunan411100China

This study introduces an innovative contour detection algorithm,PeakcET,designed for rapid and efficient analysis of natural product image fingerprints using comprehensive two-dimensional gas chromatogram(Gc×Gc).This method innovatively combines contour edge tracking with affinity propagation(AP)clustering for peak detection in Gc×Gc fingerprints,the first in this *** edge tracking signif-icantly reduces false positives caused by“burr”signals,while AP clustering enhances detection accuracy in the face of false *** efficacy of this approach is demonstrated using three medicinal products derived from curcuma *** not only performs contour detection but also employs inter-group peak matching and peak-volume percentage calculations to assess the compositional similarities and differences among various ***,this algorithm compares the Gc×Gc fingerprints of Radix/Rhizoma curcumae Wenyujin with those of products from different botanical *** findings reveal that genetic and geographical factors influence the accumulation of secondary metabolites in various plant *** sample exhibits unique characteristic components alongside common ones,and vari-ations in content may influence their therapeutic *** research establishes a foundational data-set for the quality assessment of curcuma products and paves the way for the application of computer vision techniques in two-dimensional(2D)fingerprint analysis of Gc×Gc data.

关键词： Gc×Gc Image fingerprints contour detection clustering of mass spectra curcuma products

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

MicroRNAs in thyroid cancer with focus on medullary thyroid carcinoma:potential therapeutic targets and diagnostic/prognostic markers and web based tools

引用

Oncology Research 2024年第6期32卷 1011-1019页

作者： ELHAM SHAKIBA SETI BOROOMAND sima KHERADMAND KIA MEHDI HEDAYATI Department of Biochemistry Faculty of Biological SciencesNorth Tehran BranchIslamic Azad UniversityTehran***Iran Department of Pathology and Laboratory Medicine Vancouver General HospitalVancouverV5Z 1M9Canada Department of Blood cell Research Laboratory for Red Blood Cell DiagnosticsSanquinAmsterdam1006 ANThe Netherlands cellular and Molecular Endocrine Research center Research Institute for Endocrine SciencesShahid Beheshti University of Medical SciencesTehran***Iran

This review aimed to describe the inculpation of microRNAs(miRNAs)in thyroid cancer(Tc)and its subtypes,mainly medullary thyroid carcinoma(MTc),and to outline web-based tools and databases for bioinformatics analysis of miRNAs in ***,the capacity of miRNAs to serve as therapeutic targets and biomarkers in Tc management will be *** review is based on a literature search of relevant articles on the role of miRNAs in Tc and its subtypes,mainly ***,web-based tools and databases for bioinformatics analysis of miRNAs in Tc were identified and *** can perform as oncomiRs or antioncoges,relying on the target mRNAs they *** replacement therapy using miRNA mimics or antimiRs that aim to suppress the function of certain miRNAs can be applied to correct miRNAs aberrantly expressed in diseases,particularly in *** are involved in the modulation of fundamental pathways related to cancer,resembling cell cycle checkpoints and DNA repair *** are also rather stable and can reliably be detected in different types of biological materials,rendering them favorable diagnosis and prognosis biomarkers as *** have emerged as promising tools for evaluating medical outcomes in Tc and as possible therapeutic *** contribution of miRNAs in thyroid cancer,particularly MTc,is an active area of research,and the utility of web applications and databases for the biological data analysis of miRNAs in Tc is becoming increasingly important.

关键词： Thyroid cancer MicroRNAs Biomarker Bioinformatics analysis Medullary thyroid carcinoma(MTc) OncomiRs Antioncoges

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

The Fascinating chinese character Family

引用

china Book International 2024年第1期 22-25页

作者： Lord sima Miao Lingnan Fine Arts Publishing House

This series is an engaging read about chinese characters,explaining their origins and the logic behind their *** allows readers to grasp the essence of chinese character culture and appreciate the ancient art of character *** series is divided into eight mini-volumes,each focusing on eight major categories of common everyday *** introduces over 260 key characters studied in elementary school and more than 200 practical idioms for elementary students.

关键词： everyday elementary character

来源：

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Robust tube-based MPc with smooth computation for dexterous robot manipulation

引用

Science china(Information Sciences) 2024年第11期67卷 252-268页

作者： Yu LUO Tianying JI Fuchun SUN Qie sima Huaping LIU Mingxuan JING Jianwei ZHANG Department of computer Science and Technology Tsinghua University Science & Technology on Integrated Information System Laboratory Institute of Software Chinese Academy of Sciences Department of Informatics University of Hamburg

Dexterous robot manipulation has shone in complex industrial scenarios, where multiple manipulators, or fingers, cooperate to grasp and manipulate objects. When encountering multi-objective optimization with system constraints in such scenarios, model predictive control(MPc) has demonstrated exceptional performance in complex multi-robot manipulation tasks involving multi-objective optimization with system constraints. However, in such scenarios, the substantial computational load required to solve the optimal control problem(OcP) at each triggering instant can lead to significant delays between state sampling and control application, hindering real-time performance. To address these challenges, this paper introduces a novel robust tube-based smooth MPc approach for two fundamental manipulation tasks: reaching a given target and tracking a reference trajectory. By predicting the successor state as the initial condition for imminent OcP solving, we can solve the forthcoming OcP ahead of time, alleviating delay effects. Additionally,we establish an upper bound for linearizing the original nonlinear system, reducing OcP complexity and enhancing response speed. Grounded in tube-based MPc theory, the recursive feasibility and closed-loop stability amidst constraints and disturbances are ensured. Empirical validation is provided through two numerical simulations and two real-world dexterous robot manipulation tasks, which shows that the seamless control input by our methods can effectively enhance the solving efficiency and control performance when compared to conventional time-triggered MPc strategies.

关键词： dexterous robot manipulation model predictive control smooth computation

来源：

同方期刊数据库

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

珠穆朗玛峰北坡桤木属大气花粉传输路径与来源

引用

地球科学进展 2024年第4期39卷 419-428页

作者：程久菊吕新苗朱立平马庆峰 HUMAGAIN sima PAUDAYAL N KHUM 中国科学院青藏高原研究所青藏高原地球系统与资源环境全国重点实验室北京100101 中国科学院大学北京100049 central Department of Geology Tribhuvan UniversityKathmandu 44600Nepal

认识区域大气花粉组成及其形成条件有利于明确不同类型花粉组合的气候与环境意义。利用布卡大气花粉采样器在珠穆朗玛峰北坡开展了连续2年(2012—2013年)的大气花粉观测研究。基于后向轨迹和潜在来源区域模型,探讨了秋季主要组分桤木属... 详细信息

认识区域大气花粉组成及其形成条件有利于明确不同类型花粉组合的气候与环境意义。利用布卡大气花粉采样器在珠穆朗玛峰北坡开展了连续2年(2012—2013年)的大气花粉观测研究。基于后向轨迹和潜在来源区域模型,探讨了秋季主要组分桤木属花粉的传输路径与潜在来源区域,分析了桤木属花粉与其植物分布和大气环流的关系及气候指示意义。结果显示:(1)桤木属花粉季气团传输路径主要来自于采样点西南方向;(2)桤木属花粉潜在来源区域与其气团传输路径基本一致,主要是喜马拉雅山脉中段,包括尼泊尔中部和东部以及西藏南部等地区;(3)桤木属花粉数量、传输路径和来源区域的年际变化与大气环流有关,受高空西风影响的西南气团对桤木属花粉影响更大。研究结果可以为认识珠穆朗玛峰北坡外来花粉的气候意义提供科学依据。

关键词：桤木属花粉传输路径来源区域后向轨迹模拟青藏高原

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

铜基载氧体催化电厂烟气脱氧研究

引用

燃料化学学报（中英文） 2024年第6期52卷 839-849页

作者：司马皓王雪峰邓存宝太原理工大学安全与应急管理工程学院山西太原030024

电厂烟气主要成分为N_(2)、cO_(2)和部分O_(2),将电厂烟气注入矿井采空区可实现cO_(2)封存,并替代注氮气防治遗煤自燃,但是烟气中的O_(2)是造成遗煤自燃的因素之一。因此,亟待开发一种经济有效的催化剂来脱除电厂烟气中的O_(2)。本研究... 详细信息

电厂烟气主要成分为N_(2)、cO_(2)和部分O_(2),将电厂烟气注入矿井采空区可实现cO_(2)封存,并替代注氮气防治遗煤自燃,但是烟气中的O_(2)是造成遗煤自燃的因素之一。因此,亟待开发一种经济有效的催化剂来脱除电厂烟气中的O_(2)。本研究采用共沉淀法,通过调变载体和负载量可控制备了铜基催化剂和系列xcuO/ceO_(2)催化剂,利用BET、XRD、IcP、TEM、H_(2)-TPR和XPS等手段对催化剂进行了表征,并建立催化剂结构与催化电厂烟气脱氧性能之间的构效关系。结果表明,ceO_(2)的加入提高了cuO的分散性、增加了催化剂的氧空位,提高了催化剂的活性和还原氧化性能,cu-ce界面结构的协同效应促进了还原氧化过程,表现出良好的活性和循环稳定性。30cuO/ceO_(2)由于其cuO颗粒尺寸最小、分散性最高、氧空位浓度最高,表现出较优的催化电厂烟气脱氧性能。本研究为开发低成本可循环使用、高活性和高稳定性的脱氧催化剂提供了参考。

关键词：化学链燃烧 cuO/ceO_(2) 氧化还原界面结构氧空位

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

面向历史风貌的中心城区精细化城市管控策略研究——以墨尔本中心城区为例

引用

现代城市研究 2024年第8期39卷 60-66页

作者：李翔司马艺娜厦门大学建筑与土木工程学院宁波诺丁汉大学理工学院建筑与建筑环境系

在历史城区风貌保护中,我国存在城区特色风貌指引不明、管控要素划分不够细致、元素之间缺乏整体统筹等问题,需要构建精细化城市管控体系来维护历史风貌、增强城市吸引力。文章从墨尔本维护历史城区特色风貌的精细化城市管控策略入手,... 详细信息

在历史城区风貌保护中,我国存在城区特色风貌指引不明、管控要素划分不够细致、元素之间缺乏整体统筹等问题,需要构建精细化城市管控体系来维护历史风貌、增强城市吸引力。文章从墨尔本维护历史城区特色风貌的精细化城市管控策略入手,深入分析其在历史城区风貌保持、建设开发强度管控、特色空间人性化提升和户外广告风格约束等4个层面的策略。在此基础上,结合我国历史城区保护现状,从层级体系建设、特色风貌指引、要素控制协调、管理语言传导、多方团队协作等方面归纳墨尔本精细化城市管控的思路和经验,并对我国精细化城市管控转型提出建议。

关键词：历史风貌中心城区精细化管理城市规划与设计管控墨尔本

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

珠峰北坡桤木属大气花粉传输路径与来源

引用

地球科学进展 2024年

作者：程久菊吕新苗朱立平马庆峰 HUMAGAIN sima KHUM PAUDAYAL N 中国科学院青藏高原研究所青藏高原地球系统与资源环境全国重点实验室 central Department of Geology Tribhuvan University 中国科学院大学

认识区域大气花粉组成及其形成条件有利于明确不同类型花粉组合的气候与环境意义。利用布卡大气花粉采样器在珠峰北坡开展了连续2年（2012—2013年）的大气花粉观测研究。基于后向轨迹和潜在来源区域模型，探讨了占秋季主要组分的桤木... 详细信息

认识区域大气花粉组成及其形成条件有利于明确不同类型花粉组合的气候与环境意义。利用布卡大气花粉采样器在珠峰北坡开展了连续2年（2012—2013年）的大气花粉观测研究。基于后向轨迹和潜在来源区域模型，探讨了占秋季主要组分的桤木属花粉传输路径与潜在来源区域，分析了桤木属花粉与其植物分布和大气环流的关系及气候指示意义。结果显示：(1)桤木属花粉季气团传输路径主要来自于采样点西南方向；(2)桤木属花粉潜在来源区域与其气团传输路径基本一致，主要是喜马拉雅中段，包括尼泊尔中部和东部以及西藏南部等地区；(3)桤木属花粉数量、传输路径和来源区域的年际变化与大气环流有关，受高空西风影响的西南气团对桤木属花粉影响更大。研究结果为认识珠峰北坡外来花粉的气候意义提供科学依据。

关键词：桤木属花粉传输路径来源区域后向轨迹模拟青藏高原

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

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：