检索结果-南通市图书馆

From ancient wisdom to modern science:Gut microbiota sheds light on property theory of traditional Chinese medicine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2024年第4期22卷 413-444页

作者： Ya-nan yang Jia-guo Zhan ying Cao Chong-ming Wu School of Chinese Materia Medica Tianjin University of Traditional Chinese MedicineTianjin 301617China Tianjin Key Laboratory of Therapeutic Substance of Traditional Chinese Medicine Tianjin 301617China

The property theory of traditional Chinese medicine(TCM) has been practiced for thousands of years,playing a pivotal role in the clinical application of TCM. While advancements in energy metabolism,chemical composition analysis, machine learning, ion current modeling, and supercritical fluid technology have provided valuable insight into how aspects of TCM property theory may be measured, these studies only capture specific aspects of TCM property theory in isolation, overlooking the holistic perspective inherent in TCM. To systematically investigate the modern interpretation of the TCM property theory from multidimensional perspectives, we consulted the Chinese Pharmacopoeia(2020 edition) to compile a list of Chinese materia medica(CMM). Then, using the Latin names of each CMM and gut microbiota as keywords, we searched the PubMed database for relevant research on gut microbiota and CMM. The regulatory patterns of different herbs on gut microbiota were then summarized from the perspectives of the four natures, the five flavors and the meridian tropism. In terms of the four natures, we found that warm-natured medicines promoted the colonization of specific beneficial bacteria,while cold-natured medicines boosted populations of some beneficial bacteria while suppressing pathogenic bacteria. Analysis of the five flavors revealed that sweet-flavored and bitter-flavored CMMs positively influenced beneficial bacteria while inhibiting harmful bacteria. CMMs with different meridian tropism exhibited complex modulative patterns on gut microbiota, with Jueyin(Liver) and Taiyin(Lung) meridian CMMs generally exerting a stronger effect. The gut microbiota may be a biological indicator for characterizing the TCM property theory, which not only enhances our understanding of classic TCM theory but also contributes to its scientific advancement and application in healthcare.

关键词： Traditional Chinese medicine Property theory Gut microbiota Four natures Five flavors Meridian tropism

Circularly polarized luminescence based on cholesterol-tetraphenylethylene-perylene liquid crystal

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第5期33卷 2442-2446页

作者： Shengjie Jiang Shujuan Zhou ying Chen Hongyu guo Fafu yang College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Fujian Key Laboratory of Polymer Materials Fuzhou 350007China Fujian provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering Fuzhou 350007China

Perylene derivative with circularly polarized luminescence(CPL) at aggregated state was seldom reported due to the strong ACQ(aggregation-caused quench) effect at aggregation. In this work, a novel cholesterol-tetraphenylethylene-perylene derivative(TPE-P) was designed and synthesized in moderate yield. It exhibited liquid crystalline behavior with orderly hexagonal columnar mesophase and good fluorescence emission at long wavelength(600-700 nm) not only in solution but also at aggregated states based on the AIE(aggregation-induced emission)-FRET(fluorescence resonance energy transfer) effect between tetraphenylethylene unit and perylene moiety. Moreover, the circular dichroism(CD) and CPL studies suggested the effective chiral transfer from cholesterol unit to tetraphenylethylene unit and perylene skeleton due to the spiral liquid crystalline self-assembly. The CD and CPL signals showed the order of THF < THF-hexane < solid film < meosphase, indicating that the higher spiral orderly degree resulted in the stronger chiral transfer. The largest |glum| value for mesophase excited at 320 nm was as high as 1.5×10^(−2) based on the combining effect of AIE-FRET and chiral transfer. This research not only reported a novel CPL perylene derivative at aggregated state, but also confirmed that the combination of AIE-FRET effect and chiral transfer of liquid crytalline phase was an effective method to construct normal dye with excellent CPL property in aggregated state.

关键词： Tetraphenylethylene Perylene Circularly polarized luminescence Liquid crystal FRET

Identification of Antarctic minke and killer whales with passive acoustic monitoring in Prydz Bay, Antarctica

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2022年第2期40卷 485-495页

作者： ying JIANG Lian-Gang LÜ Zongwei LIU Chunmei yang Jingsong guo First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China

Although four species of odontocete and four species of baleen whale have been recorded in Prydz Bay,their vocalizations have been rarely *** vocalizations were recorded during March 2017 in Prydz Bay,***-duck sounds,downsweeps,inverted“u”shape signals,whistles,pulsed sounds,and broadband clicks were ***-duck sounds and downsweeps were associated with Antarctic minke whales(Balaenoptera bonaerensis)based on visual *** between inverted“u”shape signals,biphonic calls,and clicks with vocalizations previously described for killer whales(Orcinus orca)lead us believe the presence of Antarctic killer *** to sound structures,signal characteristics,and recording location,Antarctic type C killer whales were the most probable candidates to produce these detected *** represent the fi rst detection of inverted“u”shape signals in Antarctic waters,and the fi rst report of Antarctic killer whale in Prydz Bay based on passive acoustic *** co-existence of Antarctic minke and killer whales may imply that minke whales can detect diff erences between the sounds of mammal-eating and fi sh-eating killer *** descriptions of these underwater vocalizations contribute to the limited body of information regarding the distribution and acoustic behavior of cetaceans in Prydz Bay.

关键词： passive acoustic monitoring inverted“u”shaped signal killer whale Antarctic minke whales Prydz Bay type C

土壤含水量调控高寒草原生态系统N_(2)O排放对增温的响应

在线全文

学校读者我要写书评

暂无评论

植物生态学报 2018年第1期42卷 105-115页

作者：王冠钦李飞彭云峰陈永亮韩天丰杨贵彪刘莉周国英杨元合中国科学院植物研究所植被与环境变化国家重点实验室北京100093 中国科学院大学北京100049 中国科学院西北高原生物研究所藏药研究重点实验室西宁810008

土壤氧化亚氮(N_2O)排放是大气N_2O不可忽视的来源。然而,目前学术界在气候变暖对土壤N_2O排放影响方面的认识仍存在较大争议,且调控土壤N_2O排放的微生物机制尚不明确。为此,该研究以青藏高原高寒草原生态系统为研究对象,使用透明开顶... 详细信息

土壤氧化亚氮(N_2O)排放是大气N_2O不可忽视的来源。然而,目前学术界在气候变暖对土壤N_2O排放影响方面的认识仍存在较大争议,且调控土壤N_2O排放的微生物机制尚不明确。为此,该研究以青藏高原高寒草原生态系统为研究对象,使用透明开顶箱(OTCs)模拟气候变暖,并基于静态箱法测定了2014和2015年生长季(5–10月)的土壤N_2O通量,同时利用定量PCR技术测定了表层(0–10 cm)土壤中氨氧化古菌(AOA)和氨氧化细菌(AOB)的基因丰度。结果显示:增温处理导致2014和2015年生长季表层(0–10 cm)土壤温度分别升高了1.7℃和1.6℃,土壤体积含水量下降了2.5%和3.3%,其他的土壤理化性质没有发生显著变化。土壤N_2O通量呈现年际差异,2014和2015年生长季的平均值分别为3.23和1.47μg·m^(–2)·h^(–1),然而,增温处理并没有显著改变土壤N_2O通量。2014年生长季主导硝化作用的AOA和AOB的基因丰度分别为5.0×10~7和4.7×10~5拷贝·g^(–1),2015年为15.2×10~7和10.0×10~5拷贝·g^(–1)。尽管基因丰度存在显著的年际差异,但在两年中与对照相比并未发生显著变化。在生长季尺度上,增温导致的土壤N_2O变化量与其引起的土壤水分变化量之间显著正相关,而与土壤温度的变化量之间没有显著相关关系。以上结果表明,增温导致的土壤干旱会抑制土壤N_2O通量对增温的响应,意味着未来评估气候变暖情景下土壤N_2O排放量时需考虑增温引发的土壤干旱等间接效应。

关键词：气候变暖氧化亚氮氨氧化古菌氨氧化细菌青藏高原

An in vitro study on the efficacy of removing calcium hydroxide from curved root canal systems in root canal therapy

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2017年第2期9卷 110-116页

作者： ying Wang Li-yang guo Hong-Zhi Fang Wen-Ling Zou ying-Ming yang Yuan Gao Hui yang Tao Hu State Key Laboratory of Oral Disease National Clinical Research Center for Oral Diseases West China Hospital of Stomatology Sichuan University Chengdu China Department of Endodontics The Affiliated Stomatology Hospital School of Medicine Zhejiang University Hangzhou China Department of Stomatology The Third People's Hospital of Chengdu Chengdu China State Key Laboratory of Oral Disease National Clinical Research Center for Oral Diseases Department of Preventive Dentistry West China Hospital of Stomatology Siehuan University Chengdu China State Key Laboratory of Oral Disease National Clinical Research Center for Oral Diseases Department of General Dentistry West China Hospital of Stomatology Sichuan University Chengdu China

To compare the efficacy of various irrigants(citric acid, ethylenediaminetetraacetic acid(EDTA) and Na OCl) and techniques in removing Ca(OH)2in two types of curved root canal systems, simulated root canals with specific curvatures were used to investigate the effects of different irrigants and instruments on Ca(OH)2removal. The optimal methods were verified on extracted human teeth. Simulated root canals were assigned to one of two groups based on the irrigation solution: 10% citric acid or2.5% Na OCl. Each group was divided into four subgroups according to the technique used to remove Ca(OH)2. The percentage of Ca(OH)2removal in different sections of root canals was calculated. On the basis of the results obtained for the simulated canals, 10% citric acid and 17% EDTA were applied to remove Ca(OH)2from the extracted human teeth with curved root canal systems. The teeth were scanned by micro computed tomography to calculate the percentage of Ca(OH)2removal in the *** simulated root canals, we found that 10% citric acid removed more Ca(OH)2than 2.5% NaOCl in the 0–1 mm group from the apex level(Po0.05). Ultrasonic and Endo Activator activation significantly removed more Ca(OH)2than a size 30 K file in the apical third(Po0.05). However, there were no significant differences in any sections of the canals for 10% citric acid or 17%EDTA in removing Ca(OH)2in extracted human teeth. We concluded that it was effective to remove residual Ca(OH)2using the decalcifying solution with Endo Activator or Passive Ultrasonic Irrigation in a curved root canal system. A protocol for Ca(OH)2removal was provided based on the conclusions of this study and the methods recommended in previous studies.

关键词： calcium hydroxide curved root canal system irrigation removal

Topological Quantization of Linear Defects

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第11期15卷 781-783页

作者： DUAN Yi-shi JIANG ying yang guo-hong Institute of Theoretical Physics Lanzhou UniversityLanzhou 730000 Department of Physics Fudan UniversityShanghai 200433

Using Ф-mapping method and topological current theory,we get the topological structure and the topological quantization of topological linear defects and point out that the topological quantum numbers of the linear defects are described by the Winding numbers of Ф-mapping which are determined in terms of the Hopf indices and the Brouwer *** the topological linear defects are generated from the zero points of the Ф-mapping.

关键词： topological Defects indices

Topological Quantization of k-Dimensional Topological Defects and Motion Equations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第5期18卷 631-633页

作者： yang guo-Hong JIANG ying DUAN Yi-Shi Department of Physics Shanghai UniversityShanghai 200436 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080 Institute of Theoretical Physics Lanzhou UniversityLanzhou 730000

UsingФ-mapping method and kth-order topological tensor current theory,we present a unified theory of describing k-dimensional topological defects and obtain their topological quantization and motion *** is shown that the inner structure of the topological tensor current is just the dynamic form of the topological defects,which are generated from the zeros of the m-component order parameter vector *** this dynamic form,the topological defects are topologically quantized naturally and the topological quantum numbers are determined by the Hopf indices and the Brouwer *** the generalization of Nielsen's Lagrangian and Nambu's action for strings,the action and the motion equations of the topological defects are also derived.

关键词： field topological tensor

HSM strategy study for hardened die and mold steels manufacturing based on the mechanical and thermal load reduction strategy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 723-728页

作者： ying Tang Hongsheng guo School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute Beijing No.1 Machine Tool Plant Beijing 101300 China

The paper discussed cutter-work engagement situation hidden behind the mechanical and thermal load effect on cutting edges during high speed hard machining process. The engagement situation was investigated in great detail using experimental and geometrical analytic measures. Experiments were conducted using A1TiN-coated micro-grain carbide end mill cutters to cut hardened die steel. On the basis, a general high speed hard machining strategy, which aimed at eliminating excessive engagement situation during high-speed machining （HSM） hard machining, was proposed. The strategy includes the procedures to identify prone-to-overload areas where excessive engagement situation occurs and then to create a reliable tool path, which has the effect of cutting load reduction to remove the prone-to-overload areas.

关键词： high-speed machining (HSM) hard machining die/mold manufacturing tool path generation load reduction

Evolution of the Topological Linear Defects

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第3期16卷 157-159页

作者： DUAN Yi-shi JIANG ying yang guo-hong Institute of Theoretical Physics Lanzhou UniversityLanzhou 730000 Department of Physics Fudan UniversityShanghai 200433

In the light of ø-mapping method and topological current theory,the topological structure and the topological quantization of topological linear defects are obtained under the condition that Jacobian J(ø/v)≠*** J(ø/v)=0,it is shown that there exists the crucial case of branch *** on the implicit function theorem and the Taylor expansion,the generation,annihilation and bifurcation of the linear defects are detailed in the neighborhoods of the limit points and bifurcation points of ø-mapping,respectively.

关键词： process. topological bifurcation