共查询到20条相似文献,搜索用时 125 毫秒
1.
目的:比较五爪龙不同提取物体外抗菌活性。方法:使用95%乙醇对五爪龙中化合物进行提取,然后分别使用石油醚、乙酸乙酯、正丁醇、水等萃取剂对乙醇总提物进行分极性段萃取。观察五爪龙各极性段对大肠杆菌、金黄色葡萄球菌、枯草杆菌、鳗弧菌的抑菌效果。结果:五爪龙四个极性段对大肠杆菌、枯草杆菌、金黄色葡萄球菌、鳗弧菌均具有一定的抑制作用,其中Ⅰ、Ⅱ段作用更强。结论:五爪龙各极性段和抑菌作用强度有明显差别,其中以乙酸乙酯、石油醚萃取的抑菌作用更强。 相似文献
2.
3.
4.
5.
6.
目的:探索酢浆草显微鉴别的专属性,为其进一步研究提供鉴别依据。方法:以红花酢浆草为对照,用常规的显微技术观察不同产地、不同海拔的酢浆草的组织构造和显微特征。结果:不同产地、不同海拔的鲜品酢浆草的横切面显微特征很相似,但与鲜品红花酢浆草的横切面显微特征差异较为明显;不同产地、不同海拔的酢浆草粉末显微特征无明显差异,与红花酢浆草的差异也不明显。结论:鲜品酢浆草的横切面显微鉴别特征专属性较强,可以作为鲜品酢浆草的显微鉴别依据,但将酢浆草粉末显微特征作为鉴别依据值得商榷。 相似文献
7.
8.
9.
10.
11.
12.
乌骨藤常见混用品种辨析 总被引:17,自引:0,他引:17
目的 纠正中药乌骨藤的常见混用现象。方法 查阅文献并整理考证。结果 乌骨藤存在严重的同名异物现象 ,文献记载作乌骨藤用的有通光散及白叶瓜馥木等 10数种。结论 正品乌骨藤应为萝 艹摩 科植物通光散 相似文献
13.
14.
在安徽牯牛降国家级自然保护区的野外调查中,通过标本鉴定和文献查阅,发现了安徽省1个新记录属、3个新记录种和1个新记录变种,即乌口树属(Tarenna Gaertn.)、白花苦灯笼Tarenna mollissima (Hook. et Arn.) Robins.、毛柄金腰Chrysosplenium pilosopetiolatum Z. P. Jien.、笔罗子Meliosma rigida Sieb. et Zucc.和虎耳草状景天Sedum drymarioides Hance var. saxifragiforme X. F. Jin et H. W. Zhang。凭证标本保存于安徽中医药大学腊叶标本馆(ACM)。这些新记录的发现,不仅为牯牛降国家级自然保护区植物类群多样性提供依据,还丰富了安徽省的植物资源种类。 相似文献
15.
16.
17.
目的 :对来自全国 10个地区的肉苁蓉类商品药材进行数码显微鉴定。方法 :采用性状鉴别与显微数码成像技术 ,对性状不易区别的种类进行了显微鉴别。结果 :10件商品药材样品的基原植物分别为肉苁蓉CistanchedeserticolaY C Ma、盐生肉苁蓉C salsa(C A Mey)BenthetHook f 和管花肉苁蓉C tubelosa (Schrenk )R Wight。结论 :市场上的肉苁蓉和盐生肉苁蓉各占 2 / 5 ,管花肉苁蓉占 1/ 5。盐生肉苁蓉与肉苁蓉性状较难区别 ,但本文的数码照片真实、直观地反映了两种药材显微构造的差别 相似文献
18.
19.
Rosa E. Negrete Nadine Backhouse Ivan Cajigal Carla Delporte Bruce K. Cassels Eberhard Breitmaier Gert Eckhardt 《Journal of ethnopharmacology》1993,40(3):149-153
Two previously undescribed elemanolide esters, the 2-methylpropanoate and 2-methyl-2-propenoate of 11,13-dehydromelitensin, were isolated in the course of a bioassay-guided fractionation from the aerial parts of Centaurea chilensis Hook. et Arn., used traditionally to treat ‘gout and rheumatism’. The mixture of both substances exhibits antiinflammatory activity in the carrageenan-induced paw edema assay. 相似文献
20.
??OBJECTIVE To identify 93 samples of Ilex asprella(Hook. et Arn.) Champ. ex Benth. and its related species based on ITS2 barcode. METHODS The total genomic DNAs were extracted and the ITS2 regions were amplified and sequenced. The genetic distances were computed using MEGA5.0 in accordance with the Kimura 2-parameter (K2P) model. The neighbor-joining (NJ) phylogenetic tree and BLAST method were used to assess the efficiency of sequence identification. RESULTS The length of ITS2 sequence of I. asprella was 241 bp and the average GC content was 63.4%. The intra-specific genetic distances of I. asprella were 0-0.030 and the minimum inter-specific of I. asprella and its closely related species was 0.043. Furthermore, I.asprella formed into a single branch with high bootstrap value in NJ tree. The identification efficiency of ITS2 barcode using BLAST was 100%. CONCLUSION The ITS2 region can accurately and stably distinguish I.asprella from its closely related species and adulterants.It provides a new method to ensure the clinical safety of traditional Chinese medicines. 相似文献