A bioactive biflavonoid from Campnosperma panamense     

Weniger B  Vonthron-Sénécheau C  Arango GJ  Kaiser M  Brun R  Anton R 《Fitoterapia》2004,75(7-8):764-767

Lanaroflavone (1), a biflavonoid isolated from the methanol extract of the aerial part of Campnosperma panamense by bioguided fractionation, has been assessed for in vitro antiprotozoal activity. Lanaroflavone showed both antimalarial and leishmanicidal activities, but was inactive against Chagas disease vector, Trypanosoma cruzi.  相似文献   

Antimicrobial activity of crude methanolic extract of Satureja khuzistanica     

Amanlou M  Fazeli MR  Arvin A  Amin HG  Farsam H 《Fitoterapia》2004,75(7-8):768-770

The methanolic extract of the aerial parts of Satureja khuzistanica was investigated for its antimicrobial activity. The maximum antibacterial and antifungal activities were observed against Staphylococcus aureus and Candida albicans.  相似文献   

栀子多糖的抗肿瘤活性研究   总被引：11，自引：1，他引：11  

石若夫  李大力  田春宇  王关林  方宏筠 《林产化学与工业》2002,22(4):67-70

采用3种不同的方法分别测定了栀子（Gardenia jasminoides Eills)多糖对3种不同肿瘤细胞的抑制情况，结果表明，栀子多糖具有比较广谱的抑瘤效应，土豆碟法测定栀子多糖对根癌农杆菌（Agrobacterium tumefaciens)C58诱导植物根瘤的最高抑制率为68．4％（1．258mg/mL栀子多糖），MTT法测定栀子多糖对人红白血病细胞K562的无毒剂量约为0．4ug/mL，低毒剂量约为14．33ug/mL，半致死剂量约为62．61ug/mL，100ug/mL栀子多糖对人红白血病K562细胞的抑制率为63．2％，实体瘤称重法测定栀子多糖对小鼠腹水肝癌Hca-f实体瘤的抑制情况表明，栀子多糖口服给药效果优于注射给药的效果，500ug/(kg.d)的栀子多糖口服对小鼠肝癌实体瘤的抑制率达49％。  相似文献   

湘西虎杖抑菌成分提取及其抑菌活性研究初报   总被引：5，自引：0，他引：5  

卢成瑛  黄早成  李翔  钟维 《中国林副特产》2005,(2):1-3

以乙醇作溶剂,对湘西虎杖抑菌活性物提取条件进行研究,通过抑菌实验得到最佳提取条件为A3B2C3,即90%乙醇、60℃、3h, 该条件下的提取物对细菌生长的抑制活性最强,但对酵母菌无明显的效果,对三种受试细菌的最小抑菌浓度(MIC)为0.25~ 0.5g/ml。提取物经85℃、100℃,15 min 或pH2~8 处理后仍具有较强的抑菌活性,其乙酸乙酯萃取物对三个菌都有较强的抑菌活性。  相似文献   

雷蘑胞外多糖抗肿瘤活性研究     

王永斌  王允祥 《中国林副特产》2006,(5):10-12

从雷蘑AS 5.105深层发酵的滤液中分离得到胞外粗多糖CGP,以KM系S180荷瘤小白鼠为实验模型,用免疫器官重量法,进行高、中、低剂量CGP的腹腔注射实验。结果表明,CGP具有较高的抑瘤活性,并与剂量呈显著相关性;高剂量组与对照组相比较,小白鼠胸腺指数和脾脏指数均有显著增加,P<0.05;与低剂量组相比较,脾脏指数有显著增加,P<0.05。表明CGP能明显提高小白鼠的免疫功能。  相似文献   

Determination of drought tolerance using root activities in Robinia pseudoacacia ''Idaho'' transformed with mtl-D gene     

Wang Hua-fang  Zhu Yi-hong  Sun Hai-jun 《中国林学(英文版)》2006,8(4)

Idaho locust (Robinia pseudoacacia 'Idaho') is an exotic multi-purpose tree used in landscaping, soil and water conservation, fodder sources and others. To improve its drought tolerance for reclaiming arid land, five lines of transformed mtl-D gene, as osmotic regulator in plant cells, have been selected and managed to determine their drought tolerance under experimental conditions.Qualitative and quantitative variables of transformed plants were studied. The critical value of drought tolerance was determined by detecting the 2,3,5-triphenyl tetrazolium chloride (TTC) reductants in roots and soil water content (SWC). The critical value for drought tolerance was SWC 6% while for the control plants the critical SWC was 8%; a moderate level of SWC is 13% and the highest SWC for plant endurance was 18%. The method proved to be reliable and sensitive in the evaluation of drought tolerance for forest trees.  相似文献   

Termiticidal activity of wood vinegar, its components and their homologues   总被引：5，自引：0，他引：5  

Mitsuyoshi Yatagai  Madoka Nishimoto  Keko Hori  Tatsuro Ohira  Akira Shibata 《Journal of Wood Science》2002,48(4):338-342

The termiticidal activity of wood vinegar, its components, and their homologues have been studied. Three kinds of wood vinegar made from the mixed chips ofCryptomeria japonlca andPseudotsga menziesii (wood vinegar A),Quercus serrata (wood vinegar B), andPinus densiflora (wood vinegar C) exhibited high termiticidal activities againstReticulitermes speratus. Acetic acid, which is the largest content of wood vinegar, exhibited high termiticidal acitivity. The contents of organic fraction of wood vinegars and acetic acid might be responsible for the differences in termiticidal activities among these wood vinegars. The structure and termiticidal activity relations of phenols were studied. Phenol with some substituents revealed higher termiticidal activity than benzene derivatives, which have no hydroxyl group; an ortho substituent of phenol plays an important role in termiticidal activity. It has become apparent that high termiticidal activity cannot be obtained by a phenolic hydroxyl group alone; it can be obtained, however, by some substituents, especially an ortho substituent in addition to a phenolic hydroxyl group. The bulkiness of the substituent at the ortho position participates in termiticidal activity; activity decreases as the size of an ortho substituent increases. It is thought that the interaction at the receptor site of termites is affected by the increased size of the ortho substituent.  相似文献   

Tracer methods to assess nutrient uptake distribution in multistrata agroforestry systems   总被引：3，自引：0，他引：3  

J. Lehmann  T. Muraoka 《Agroforestry Systems》2001,53(2):133-140

Separate assessment of nutrient uptake by individual plants in mixed cropping with trees is impossible without tracer techniques. The different ¹⁵N-to-¹⁴N isotope ratio of atmospheric and soil N can be used to study the contribution of biologically fixed N to the nutrition of associated trees. In most cases, the assessment of nutrient uptake distribution is an appropriate way of evaluating how to improve the transfer of biologically fixed N. Radioisotopes (e.g., ³²P), stable isotopes (e.g., ¹⁵N) and rare elements (e.g., Sr) can be used to determine relative root activity distribution by applying the tracer to different soil depths or distances from trees. A broadcast application of the tracer instead of point application makes it possibe to calculate uptake values per unit area. The direct determination of nutrient pathways with such robust experiments offers considerable advantages for improving nutrient use efficiency and complementarity in multistrata agroforestry systems. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献   

秦岭南坡中山地带华北落叶松人工林对土壤的影响   总被引：24，自引：1，他引：24  

雷瑞德  党坤良 《林业科学》1997,33(5):463-470

秦岭南坡中山地带华北落叶松人工林对土壤的影响雷瑞德，党坤良，张硕新，谭芳林（西北林学院森林资源保护系杨陵７１２１００）关键词华北落叶松，土壤养分状况，阳离子交换量，酶活华北落叶松（Ｌａｒｉｘｐｒｉｎｃｉｐｉｓ－ｒｕｐｐｒｅｃｈｃｉｉＭａｒｙｒ．）天然...  相似文献   

椿叶花椒与川椒过氧化氢酶活力的比较研究     

刘友全  马英  何友军  刘鲲 《中南林业科技大学学报(自然科学版)》2005,25(4):76-77

对两个花椒树种的过氧化氢酶活性进行了研究,结果表明椿叶花椒比川椒的酶活性高7.98%,这对花椒的抗寒性研究具有重要意义.  相似文献