期刊文献+
共找到569篇文章
< 1 2 29 >
每页显示 20 50 100
Determination on Heavy Metals Content of Achyranthes bidentata Blume. through Inductively Coupled Plasma Mass Spectrometry (ICP-MS) 被引量:4
1
作者 李宇伟 王新民 +3 位作者 连瑞丽 魏志华 介晓磊 陈士林 《Agricultural Science & Technology》 CAS 2008年第5期145-149,共5页
[Objective] The inductively coupled plasma mass spectrometry(ICP-MS)was constructed to determine the contents of lead,cadmium,mercury and arsenic in Archyranthes bidentata Blume.[Method]Under the optimum operation con... [Objective] The inductively coupled plasma mass spectrometry(ICP-MS)was constructed to determine the contents of lead,cadmium,mercury and arsenic in Archyranthes bidentata Blume.[Method]Under the optimum operation condition of ICP-MS,the samples were digested by microwave.The element 114In was taken as an internal standard element to compensate body effect and ICP-MS method was used to determine the contents of lead,cadmium,mercury and arsenic.[Result]For the determined elements,the correlation coefficient(r)of standard curve was over 0.9995 and recovery rate was from 96.7% to 106.4% while RSD was less than 11.2%.The result of determination showed that the heavy metal content in Archyranthes bidentata Blume.beyond standard was serious.[Conclusion]The constructed ICP-MS method with simple operation,rapid response,accuracy and high sensitivity in this experiment could be used for quality control of Chinese medicinal materials by detecting heavy metal contents in different Chinese medicinal materials from original places. 展开更多
关键词 MICROWAVE DIGESTION Inductively coupled plasma mass spectrometry(ICP-MS) Achyranthes bidentata blume. HEAVY metal
下载PDF
双模随机晶场对纳米管上Blume-Capel模型磁化强度和相变的影响 被引量:18
2
作者 李晓杰 刘中强 +2 位作者 王春阳 徐玉良 孔祥木 《物理学报》 SCIE EI CAS CSCD 北大核心 2015年第24期326-333,共8页
近年来,磁性纳米管的物理性质和相关应用得到了人们的广泛关注.利用有效场理论研究了纳米管上双模随机晶场中Blume-Capel模型的磁化强度和相变性质,得到了系统的磁化强度与温度和随机晶场的关系及其相图.结果表明:系统在稀释晶场、交错... 近年来,磁性纳米管的物理性质和相关应用得到了人们的广泛关注.利用有效场理论研究了纳米管上双模随机晶场中Blume-Capel模型的磁化强度和相变性质,得到了系统的磁化强度与温度和随机晶场的关系及其相图.结果表明:系统在稀释晶场、交错晶场和同向晶场中会表现出不同的磁学性质和相变行为;稀释晶场和交错晶场会抑制系统的磁化强度,导致其基态饱和值小于1,而同向晶场则不会;随着随机晶场参量的变化,系统存在多个相变温度,并呈现出三临界现象和重入现象. 展开更多
关键词 随机晶场 blume-CAPEL模型 纳米管 有效场理论
下载PDF
Blume-Emery-Griffiths纳米管的热力学与相变性质 被引量:13
3
作者 魏东 孔祥木 《原子与分子物理学报》 北大核心 2017年第3期515-521,共7页
利用有效场理论研究了柱形纳米管上Blume-Emery-Griffiths系统的热力学与相变性质,得到了系统的磁化强度、磁化率、比热和相图.讨论了四次交换作用与二次交换作用的比值r与晶格场对系统热力学量和相图的影响.研究发现:系统存在三临界点... 利用有效场理论研究了柱形纳米管上Blume-Emery-Griffiths系统的热力学与相变性质,得到了系统的磁化强度、磁化率、比热和相图.讨论了四次交换作用与二次交换作用的比值r与晶格场对系统热力学量和相图的影响.研究发现:系统存在三临界点,且三临界点由参数r和晶格场共同决定,即若确定了参数r,则三临界点所对应的晶格场也能确定.随着参数r的增加,系统出现三临界点时所对应的温度和晶格场也相应增大. 展开更多
关键词 磁化强度 blume—Emery—Griffiths模型 纳米管 有效场理论
下载PDF
Supporting Nursing Technology for the Marker-Assisted Selection of Castanea mollissima Blume
4
作者 刘婷 苏淑钗 +2 位作者 王倩 刘万平 王静 《Agricultural Science & Technology》 CAS 2011年第5期666-669,673,共5页
[Objective] The aim was to study the supporting raising technology of Castanea mollissima Blume molecular marker-assisted selection to reduce the cost and time for chestnut breeding.[Method] To find the best cutting m... [Objective] The aim was to study the supporting raising technology of Castanea mollissima Blume molecular marker-assisted selection to reduce the cost and time for chestnut breeding.[Method] To find the best cutting method,10 treatments were designed according to transverse diameter and vertical diameter of the chestnut including different cutting ratios in 1/2,1/3,1/4 and different directions about cross cutting,vertical cutting,bevel cutting and two side-cutting.The germination rate,seedling survival rate and morphological indicators of the treatments were measured;significant difference among them was also analyzed.[Result] 1/3 bevel cutting was the best,which not only could give high germination rate and survival rate,but also could guarantee high quality of nursery stock,which did not grow so differently with the untreated seedlings.[Conclusion] This way can not only reduce too much cost and time for seedling breeding,but also promote the germination of chestnut in advance,which could do much good to production. 展开更多
关键词 Castanea mollissima blume Marker-assisted selection Seedling raising
下载PDF
具有Dzyaloshinskii-Moriya作用的Blume-Capel模型的临界性质
5
作者 孙光厚 余里生 +2 位作者 尹训昌 王殿元 王庆凯 《低温与超导》 CAS CSCD 北大核心 2009年第4期64-66,共3页
应用二自旋集团平均场近似的方法,研究了蜂窝晶格和正方晶格上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,所研究系统存在三临界点,并且三临界温度不随DM作用参量单调变化,三临界温... 应用二自旋集团平均场近似的方法,研究了蜂窝晶格和正方晶格上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,所研究系统存在三临界点,并且三临界温度不随DM作用参量单调变化,三临界温度有最小值。系统的这种临界性质是交换耦合作用、晶体场作用和DM作用三者相互竞争的结果。 展开更多
关键词 blume-CAPEL模型 Dzyaloshinskii-Moriya作用 三临界点 平均场近似
下载PDF
三维键无规Blume-Capel模型的相图研究
6
作者 朱海霞 晏世雷 《德州学院学报》 2011年第6期43-45,64,共4页
在有效场框架下,运用切断近似的方法,对三维键无规Blume-Capel模型(BCM)的相图进行了研究.具体分析了三临界点(TCP)随两种无序因子的变化关系,讨论了稀疏晶场和键无规对相图特征的具体影响,并给出相应的相图.
关键词 blume—Capel模型 键无规 三临界点
下载PDF
Dzyaloshinskii-Moriya作用对Blume-Capel模型热力学性质的影响
7
作者 孙光厚 尹训昌 +2 位作者 王殿元 吴杏华 潮兴兵 《安庆师范学院学报(自然科学版)》 2009年第2期18-19,31,共3页
应用二自旋集团平均场近似的方法,研究了蜂窝格子上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,此系统存在三临界点,并且三临界点不是随DM作用参量单调变化。系统的这种临界行为可以... 应用二自旋集团平均场近似的方法,研究了蜂窝格子上具有Dzyaloshinskii-Moriya(DM)作用的Blume-Capel模型的临界性质,得到了该系统的相图。结果表明,此系统存在三临界点,并且三临界点不是随DM作用参量单调变化。系统的这种临界行为可以解释为交换耦合作用、晶体场作用和DM作用三者之间相互竞争的结果。 展开更多
关键词 blume-Capel模型Dzyaloshinskii--Moriya作用 三临界点 二自旋集团平均场近似
下载PDF
Blume-Capel模型的相变特性研究
8
作者 朱海霞 徐跟建 《安徽工程科技学院学报(自然科学版)》 2009年第1期52-54,共3页
在有效场框架下,就三维稀疏晶场作用的键无规Blume-Capel模型(BCM)的相图进行了研究.具体分析了三临界点(TCP)随稀疏晶场和键无规这两种无序因子的变化关系及相变曲线呈现的新特征,给出了相应的相图.
关键词 blume-CAPEL模型 稀疏晶场 键无规
下载PDF
Mn对超富集植物短毛蓼(Polygonum pubescens Blume)抗氧化机理的影响 被引量:9
9
作者 李燕 刘可慧 +5 位作者 于方明 邓华 杨栋林 周振明 刘华 李明顺 《农业环境科学学报》 CAS CSCD 北大核心 2011年第12期2422-2427,共6页
采用水培的方法,研究了不同浓度Mn(0、0.5、1、2、4、8mmol·L-1)对新发现的Mn超富集植物短毛蓼(Polygonum pubescens Blume)生长、Mn吸收及Mn对其抗氧化酶和非酶系统的影响。结果表明,锰处理显著增加了(P<0.05)短毛蓼根、茎、叶... 采用水培的方法,研究了不同浓度Mn(0、0.5、1、2、4、8mmol·L-1)对新发现的Mn超富集植物短毛蓼(Polygonum pubescens Blume)生长、Mn吸收及Mn对其抗氧化酶和非酶系统的影响。结果表明,锰处理显著增加了(P<0.05)短毛蓼根、茎、叶中Mn的含量,锰处理还引起了短毛蓼叶片中过氧化氢(H2O2)和丙二醛(MDA)的累积。当Mn处理浓度大于1mmol·L-1时,显著降低了短毛蓼的株高、株重(P<0.05);当Mn处理浓度为8mmol·L-1时,短毛蓼叶片中叶绿素a、叶绿素b、叶绿素a+b含量最低,与对照差异显著(P<0.05)。Mn处理显著提高了短毛蓼叶片中超氧物歧化酶(SOD)活性(P<0.05),而过氧化物酶(POD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)的活性呈先升后降趋势,表明Mn处理打破了短毛蓼活性氧物质的正常代谢,并启动了抗氧化酶系统。8mmol·L-1的Mn处理,显著提高了短毛蓼叶片中巯基(-SH)、还原型谷胱甘肽(GSH)的含量(P<0.05),比对照分别提高了10.6%和20%,表明-SH、GSH在短毛蓼缓解Mn毒害的过程中起着重要作用。 展开更多
关键词 短毛蓼 抗氧化酶 非酶物质
下载PDF
Hypolipidaemic and antioxidant effect of Enicostemma littorale Blume 被引量:12
10
作者 Thirumalai T Viviyan Therasa S +1 位作者 Elumalai EK David E 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2011年第5期381-385,共5页
Objective:To investigate the hypolipidaemic and antioxidant effects of aqueous leaf extract of Enicoslemma littorale(E.littorale)Blume(Ens)against ethanol induced hepatic injury in albino rats.Methods:Male albino rats... Objective:To investigate the hypolipidaemic and antioxidant effects of aqueous leaf extract of Enicoslemma littorale(E.littorale)Blume(Ens)against ethanol induced hepatic injury in albino rats.Methods:Male albino rats of six numbers in each group were undertaken for study.Hypolipidaemic and antioxidant effect of E.littorale Blume(Ens)aqueous leaf extract at a dosage of 250 mg/kg bw was evaluated.Results:Levels of serum and tissue cholesterol,triglycerides and free fatty acids were elevated and levels of tissue thiobarbituric acid reactive substances(TBARS)and lipid hydroperoxide were increased in ethanol treated rats.The activity levels of liver antioxidant enzymes such as superoxide dismutase(SOD),catalase(CAT),glutathione peroxidase(GPX)and glutathione-s-transferase(GST)were decreased.After adiminstration of extract of E,littorale Blume,levels of cholesterol,triglycerides and free fatty acids were decreased in serum and liver tissue,levels of TBARS and lipid hydroperoxide were decreased,and Ever antioxidant enzymes were increased in liver tissue;Conclusions:It can be concluded that the aqueous leaf extract of E,littorale Blume(Ens)has potent restorative effect on hyperlipidaemic and oxidative stress. 展开更多
关键词 HEPATOPROTECTIVE ETHANOL ANTIOXIDANT ENZYMES Enicostemma littorale blume OXIDATIVE STRESS Hypolipidaemic effect
下载PDF
Therapeutic potential of Gastrodia elata Blume for the treatment of Alzheimer's disease 被引量:22
11
作者 Guang-Biao Huang Tong Zhao +10 位作者 Sushma Shrestha Muna Hong-Mei Jin Jong-Il Park Kyu-Sik Jo Bo-Hee Lee Soo-Wan Chae Sun-Young Kim Soo-Hyun Park Eun-Ock Park Eun-Kyung Choi Young-Chul Chung 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第12期1061-1070,共10页
Several studies have demonstrated that the Chinese herb Gastrodia elata Blume can protect against amyloid beta-peptide (Ap)-induced cell death. To investigate the possible therapeutic effects of Gastrodia elata Blum... Several studies have demonstrated that the Chinese herb Gastrodia elata Blume can protect against amyloid beta-peptide (Ap)-induced cell death. To investigate the possible therapeutic effects of Gastrodia elata Blume on Alzheimer's disease, we established a rat model of AIzheimer's disease by injecting A325-35 into bilateral hippocampi. These rats were intragastrically administered 500 or 1 000 mg/kg Gastrodia elata Blume per day for 52 consecutive days. Morris water maze tests showed that Gastrodia elata Blume treatment significantly improved the spatial memory of Alzheimer's disease rats. Congo red staining revealed that Gastrodia elata Blume significantly reduced the number of amyloid deposits in the hippocampus of these rats. Western blot analysis showed that choline acetyltransferase expression in the medial septum and hippocampus was significantly increased by the treatment of Gastrodia elata Blume, while EIIman method showed significant decrease in the activity of acetylcholinesterase in all three regions (prefrontal cortex, medial septum and hippocampus). These findings suggest that long-term administration of Gastrodia elata Blume has therapeutic potential for Alzheimer's disease. 展开更多
关键词 neural regeneration neuroprotective effect Traditional Chinese medicine Gastrodia elata blume Alzheimer's disease Morris water maze test choline acetyltransferase ACETYLCHOLINESTERASE grants-supported paper NEUROREGENERATION
下载PDF
Antioxidant and α-glucosidase inhibitor activities of natural compounds isolated from Quercus gilva Blume leaves 被引量:4
12
作者 Anastasia Wheni Indrianingsih Sanro Tachibana +1 位作者 Rizna Triana Dewi Kazutaka Itoh 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2015年第9期722-728,共7页
Objective: To isolate and investigate antioxidant and α-glucosidase inhibitor compounds in the leaves of Quercus gilva Blume(Q. gilva).Methods: Dry leaves of Q. gilva were extracted with methanol and the methanolic e... Objective: To isolate and investigate antioxidant and α-glucosidase inhibitor compounds in the leaves of Quercus gilva Blume(Q. gilva).Methods: Dry leaves of Q. gilva were extracted with methanol and the methanolic extract was further separated by silica gel column chromatography using several solvents with increasing polarity. The antioxidant activities of the isolated compounds were evaluated using various in vitro assays: 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity, hydrogen peroxide radical scavenging activity, β-carotene bleaching assay, and reducing power assay. The α-glucosidase inhibitory assay was conducted against α-glucosidase from Saccharomyces cerevisiae.Results: Three compounds were isolated and their structures were identii ed as catechin(1), epicatechin(2), and tiliroside(3) using an instrumental analysis. Compound 2 had higher antioxidant activity with inhibitory concentrations(IC50) of(22.55 ± 2.23) μmol/L than that of quercetin, which was used as the standard, with an IC50 of(28.08 ± 2.39) μmol/L, followed by compound 1 with IC50 of(40.86 ± 3.45) μmol/L. On the other hand, compound 3 had the lowest antioxidant activity with an IC50 of(160.24 ± 8.15) μmol/L. However, compound 3 had the highest α-glucosidase inhibitory activity with an IC50 of(28.36 ± 0.11) μmol/L, followed by compounds 1 and 2 with(168.60 ± 5.15) and(920.60 ± 10.10) μmol/L, respectively.Conclusions: The results obtained for the antioxidant activities and α-glucosidase inhibitory activities in a methanolic extract from the leaves of Q. gilva coni rmed the potential of this plant as a source of natural antioxidants and antidiabetic medicine. 展开更多
关键词 QUERCUS gilva blume ANTIOXIDATIVE activity Α-GLUCOSIDASE inhibitor Lineweaver-Burk PLOT
下载PDF
稀释晶场对纳米管上Blume-Capel模型磁化性质的研究 被引量:16
13
作者 李晓杰 王渺渺 陈文龙 《原子与分子物理学报》 CAS 北大核心 2019年第3期527-532,共6页
利用有效场理论研究了纳米管上稀释晶场中Blume-Capel模型格点的磁化强度、内能、比热和自由能,得到了系统格点的磁化强度、内能、比热和自由能与温度和稀释晶场的关系.结果表明:稀释晶场取值概率和晶场强度等诸多因素相互竞争,使系统... 利用有效场理论研究了纳米管上稀释晶场中Blume-Capel模型格点的磁化强度、内能、比热和自由能,得到了系统格点的磁化强度、内能、比热和自由能与温度和稀释晶场的关系.结果表明:稀释晶场取值概率和晶场强度等诸多因素相互竞争,使系统表现出比含恒定晶场作用的Blume-Capel模型更为丰富的磁学特性;稀释晶场会抑制系统格点的磁化强度,导致其基态饱和值小于1;温度较低时,系统格点的磁化强度表现出复杂性;晶场较强时,系统的内能、比热和自由能也呈现出不同的磁学性质. 展开更多
关键词 稀释晶场 磁化性质 有效场理论 blume-CAPEL模型 纳米管
下载PDF
A new alkaloid from Castanea mollissima Blume 被引量:4
14
作者 Dong Song Zhang Hui Yuan Gao +2 位作者 Xiao Mei Song Zhi Shu Tang Li Jun Wu 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第7期832-834,共3页
A new alkaloid, named 6-(2',3'-dihydroxy-4'-hydroxymethyl-tetrahydro-furan-1'-yl)cyclopentadiene[c]pyrrole-1,3-diol, was isolated from the seeds of Castanea mollissima Blume. The structure was elucidated based o... A new alkaloid, named 6-(2',3'-dihydroxy-4'-hydroxymethyl-tetrahydro-furan-1'-yl)cyclopentadiene[c]pyrrole-1,3-diol, was isolated from the seeds of Castanea mollissima Blume. The structure was elucidated based on spectroscopic evidence including 2D NMR techniques. 展开更多
关键词 Castanea mollissima blume ALKALOID 6-(2' 3'-Dihydroxy-4'-hydroxylmethyl-tetrahydro-furan-1'-yl)cyclopentadiene[c]pyrrole-1 3-diol
下载PDF
Two New Cycloartane Triterpenes from The Leaves of Quercus valiabilis Blume 被引量:2
15
作者 LiHongZHOU QiShiSUN YanWANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第12期1265-1267,共3页
Two new cycloartane triterpenes were separated from the leaves of Quercus valiabilis Blume. The structures were identified as 4α,14α-dimethyl-9β,19-cycloergost-3α-yl-24-one and 4α,14α-dimethyl-9β,19-cycloergost... Two new cycloartane triterpenes were separated from the leaves of Quercus valiabilis Blume. The structures were identified as 4α,14α-dimethyl-9β,19-cycloergost-3α-yl-24-one and 4α,14α-dimethyl-9β,19-cycloergost-24(24′)-en-3α-yl-acetate. 展开更多
关键词 Quercus valiabilis blume TRITERPENE CYCLOARTANE cycloeucalenol.
下载PDF
Spin-1 Blume-Capel model with longitudinal random crystal and transverse magnetic fields:A mean-field approach 被引量:2
16
作者 Erhan Albayrak 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期494-498,共5页
The spin-1 Blume–Capel model with transverse and longitudinal external magnetic fields h, in addition to a longitudinal random crystal field D, is studied in the mean-field approximation. It is assumed that the cryst... The spin-1 Blume–Capel model with transverse and longitudinal external magnetic fields h, in addition to a longitudinal random crystal field D, is studied in the mean-field approximation. It is assumed that the crystal field is either turned on with probability p or turned off with probability 1 p on the sites of a square lattice. Phase diagrams are then calculated on the reduced temperature crystal field planes for given values of γ=Ω/J and p at zero h. Thus, the effect of changing γ and p are illustrated on the phase diagrams in great detail and interesting results are observed. 展开更多
关键词 random crystal field transverse field spin-1 blume–Capel model
下载PDF
小世界网络上Blume-Emery-Griffiths模型的研究
17
作者 杨耀辉 陈恒杰 杨达晓 《复杂系统与复杂性科学》 EI CSCD 2010年第1期59-63,共5页
尝试在小世界网络结构上引入简化Blume-Emery-Griffiths动力学模型,描述三态舆论演化动力学过程。数值模拟结果表明内部热噪声T对舆论演化过程有较大影响,在一定条件下发现舆论演化过程类似于Ising铁磁体,内部热噪声T存在临界值。结果... 尝试在小世界网络结构上引入简化Blume-Emery-Griffiths动力学模型,描述三态舆论演化动力学过程。数值模拟结果表明内部热噪声T对舆论演化过程有较大影响,在一定条件下发现舆论演化过程类似于Ising铁磁体,内部热噪声T存在临界值。结果在一定程度上反映了现实舆论的形成过程,同时也印证了该模型的合理性。 展开更多
关键词 小世界网络 blume-Emery-Griffiths(BEG)模型 舆论
下载PDF
Critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume-Capel model in the presence of an applied field 被引量:5
18
作者 晏世雷 朱海霞 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第12期3026-3032,共7页
This paper studies the critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume-Capel model (BCM) in the presence of an applied field within the effective field theory. The... This paper studies the critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume-Capel model (BCM) in the presence of an applied field within the effective field theory. The trajectory of tricritical point, reentrant transitions and degenerate patterns of anisotropy are obtained both for the bond and the anisotropy dilutions. The global phase diagrams demonstrate unusually reentrant phenomena. The temperature dependences of magnetization curves undergo remarkable spin glass behaviour at low temperatures, and transform from ferromagnetism to paramagnetism at high temperature in applied fields. Temperature dependence of magnetic susceptibility curve is in qualitative agreement with experimental result. 展开更多
关键词 critical behaviours and magnetic properties blume-Capel model bond and anisotropy dilutions applied field
下载PDF
A New Diterpene from Suregada glomerulate(Blume) Baill 被引量:2
19
作者 SuLiHE RuoYunCHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第6期786-788,共3页
A new diterpene with an abietane skeleton, 3β-hydroxy-8α,14α-epoxyabieta-11,13(15)- dien-16,12-olide, was isolated from the root of Suregada glomerulate(Blume) Baill. Its structure was elucidated on the basis of sp... A new diterpene with an abietane skeleton, 3β-hydroxy-8α,14α-epoxyabieta-11,13(15)- dien-16,12-olide, was isolated from the root of Suregada glomerulate(Blume) Baill. Its structure was elucidated on the basis of spectroscopic and X-ray crystallographic analysis. 展开更多
关键词 Suregada glomerulate(blume) Baill DITERPENE ABIETANE 3β-hydroxy-8α 14α-epoxy- abieta-11 13 (15)-dien-16 12-olide X-ray crystallographic analysis.
下载PDF
α-Glucosidase inhibitor produced by an endophytic fungus, Xylariaceae sp. QGS 01 from Quercus gilva Blume 被引量:2
20
作者 Anastasia Wheni Indrianingsih Sanro Tachibana 《Food Science and Human Wellness》 SCIE 2017年第2期88-95,共8页
Xylariaceae sp.QGS 01,an endophytic fungus isolated from the stem of Quercus gilva Blume showed high-glucosidase inhibitory activity.α-Glucosidase inhibitor have the role as one of carbohydrate-hydrolyzing enzymes to... Xylariaceae sp.QGS 01,an endophytic fungus isolated from the stem of Quercus gilva Blume showed high-glucosidase inhibitory activity.α-Glucosidase inhibitor have the role as one of carbohydrate-hydrolyzing enzymes to postpone absorption of glucose in the digestive organs.The α-glucosidase inhibitor constituents were isolated from the ethyl acetate extract of the mycellium of endophytic fungi Xylariaceae sp.QGS 01 using a bioassay-guided fractionation technique.Further separation and purification of the active fraction led to the isolation of constituents with strong inhibitory activities against-glucosidase:8-hydroxy-6,7-dimethoxy-3-methylisocoumarine(1)with inhibitory concentration(IC50)values against-glucosidase from Saccharomyces cerevisiae of 41.75μg/mL,while quercetin as the standard had an IC50 value of 4.80g/mL.The results of the present study showed that the endophytic fungus Xylariaceae sp.QGS 01 is potentially a rich source of antidiabetic medicine. 展开更多
关键词 Endophytic fungi Quercus qilva blume α-Glucosidase inhibitory activity Xylariaceae sp. Isocoumarine derivative
下载PDF
上一页 1 2 29 下一页 到第
使用帮助 返回顶部