排序方式： 共有94条查询结果，搜索用时 18 毫秒
81.
美洲商陆和姜黄提取物抑菌活性的研究 总被引：2，自引：0，他引：2
采用生长速率法测定了美洲商陆Phytolacca amercana Roxb、姜黄Curcuma longa2种中药植物多种溶剂提取物对玉米小斑病菌Helminthosporium maydis、棉花枯萎病菌Fusarium oxysporium、柑橘绿霉病菌Penicilliam digitatum和小麦纹枯病菌Rhizotoniacereais 4种植物病原真菌的生物活性。结果表明,姜黄提取物对玉米小斑和小麦纹枯2种病原菌有较好的抑制作用,其中乙醚提取物对玉米小斑病菌抑制效果最好,其：EC50为0．4688g／L,石油醚提取物对小麦纹枯病菌抑制效果最好,其EC50为0．034g／L。美洲商陆甲醇提取物对柑橘绿霉和小麦纹枯2种病原菌有较强的抑制作用,尤其是根、叶、果3部分的提取物。从甲醇提取物中分离得到美洲商陆总皂甙,生测结果表明美洲商陆总皂甙对柑橘绿霉病菌有很强的抑制作用,其EC50为0．2032g／L。 相似文献
82.
采用160只7日龄健康雏鸡,随机分为4组,即正常对照组(Ⅰ)、环磷酰胺组(Ⅱ)、环磷酰胺 莪术多糖组(Ⅲ)、莪术多糖组(Ⅳ),分别测定血细胞的吞噬率、吞噬指数,血清的SOD活性及LPO含量,同时处死雏鸡,测定法氏囊和脾脏指数,观察其组织结构。结果表明,莪术多糖对.OH和O2-有明显的清除作用,最高清除率分别是88.91%和98.5%;SOD活性显著增加,与对照组相比最高可提高145%;LPO含量下降,与对照组相比最大可降低40.95%;各组雏鸡体重从使用药第2周开始快速增长,最大平均周增重为48.75 g/周;莪术多糖可使血细胞的吞噬率及吞噬指数、法氏囊和脾脏的相对重量均明显升高,并能促进法氏囊和脾脏的快速发育;环磷酰胺加莪术多糖组上述指标接近正常对照组,说明莪术多糖能补偿环磷酰胺对雏鸡免疫系统的抑制作用。由此可见,莪术多糖具有一定的抗氧化能力,提高机体免疫力,而且能促进雏鸡生产性能,修复组织损伤。 相似文献
83.
以广西莪术(Curcuma kwangsiensis S.G.Lee et C.F.Liang)嫩叶为材料,采用单因素和正交试验设计建立和优化SSR-PCR反应体系和反应程序,对最适宜退火温度(Tm)进行筛选优化,对17对已公布的姜黄属通用性引物进行扩增试验,筛选出多态性好、条带清晰的引物。结果表明,建立了适合广西莪术SSR分析的反应体系和扩增程序,即在15μL体系中,DNA模板为30 ng/μL,3μL,Mix(包含DNTP、Mg2+、1×buffer、Taq酶)为5μL,dd H2O为6μL,引物为各0.5μL时,分析效果较好,扩增程序为94℃预变性5min;94℃变性30 s,根据不同引物的退火温度复性30 s,72℃延伸1.5 min,共35个循环;最后72℃延伸5 min;反应结束后,4℃保存。同时筛选出在试验材料中能产生较清晰主带的引物共12对,初步验证了应用SSR分子标记分析在广西莪术遗传多样性的可行性。 相似文献
84.
85.
Suphrom N Pumthong G Khorana N Waranuch N Limpeanchob N Ingkaninan K 《Fitoterapia》2012,83(5):864-871
Six sesquiterpenes: germacrone (1), zederone (2), dehydrocurdione (3), curcumenol (4), zedoarondiol (5) and isocurcumenol (6) were isolated from rhizomes of Curcuma aeruginosa Roxb. (Zingiberaceae). They inhibited 5α-reductase which converts testosterone to dihydrotestosterone (DHT). Germacrone (1) was the most potent (IC(50)=0.42±0.05 mg/mL). Compound 1 was anti-androgenic in LNCaP cells when proliferation was testosterone-induced. The growth of flank gland of male Syrian hamsters is dependent on circulating androgen and when maintained with testosterone, 1 (3, 30, 100μg) inhibited growth but was ineffective against DHT. The similar activity profile was observed on the 5α-reductase inhibitor, finasteride (100 μg) treatment group. The androgen receptor binding assay showed that 1 did not bind to the androgen receptor. In conclusion, 1 showed anti-androgenic effect on in vitro and in vivo assays. One of the possible mechanisms was inhibition 5α-reductase activity. Thus, 1 is a potential lead compound for treatment of androgen-dependent disorders. 相似文献
86.
以姜科姜黄属（Curcuma L.）的31种植物为研究对象,把47项分类性状（指标）分解为定性指标和定量指标,将定性指标进一步分解为二元性状指标和三元性状指标,然后各自进行粗糙集理论的处理和聚类,把聚类结果按交集分类的办法形成定性指标综合分类的．结果,分出8大类,并与肖小河等用47项指标进行主成分析和聚类分析的结果加以比较。结果表明：把分类性状（指标）分解是合理的、正确的,所分出的结果较为精确,与实际更为相符;粗糙集理论与聚类分析相结合是非常有意义的。 相似文献
87.
88.
《Soil Science and Plant Nutrition》2013,59(6):711-716
Abstract Curcuma (Curcuma alismatifolia cv. Gagnep.), a tropical flowering plant known as “Siam tulip”, were cultivated in a pot with vermiculite and supplied with different levels of nitrogen (N). Rhizomes with storage roots were harvested at 215 days after planting. Results indicated that a high level of N supply increased flower numbers and promoted continuous new rhizome formation, but storage root growth was depressed. The N supply to the plants increased the N concentrations both in the rhizomes and in the storage roots. The predominant nitrogenous compounds related to total N increase were proteins in the rhizomes. The N of the insoluble fraction of 80% ethanol or the N of the soluble fraction of 10% trichloroacetic acid was the predominant fraction of N that accumulated in the storage roots. A lack of N supply increased the starch concentration both in the rhizomes and in the storage roots. These results suggested that a high level of N supply to the curcuma plant increased new rhizome formation because of increased flower numbers, but depressed new storage root formation because of reduced starch accumulation. 相似文献
89.
温郁金愈伤组织培养及快速繁殖 总被引：1，自引：0，他引：1
为了提纯复壮温郁金资源,快速繁殖良种苗木,满足市场供不应求的现状,对温郁金外植体培养及愈伤组织的诱导、继代、分化和再生进行研究.结果表明:莪术外植体在以MS培养基为基本培养基,附加6-BA 3.0 mg/L IAA 1.0 mg/L适于丛生芽的诱导与增殖;附加2,4-D 2.0 mg/L KT 5.0 mg/L适于愈伤组织的诱导;附加2,4-D 1.0 mg/L KT 0.5 mg/L适于愈伤组织的继代培养;附加KT 5.0 mg/L NAA 0.3 mg/L适于愈伤组织的分化,生根的最佳培养基为MS IAA 1.0 mg/L.因此,可以通过组织培养的方式提纯复壮温郁金资源,进行温郁金的快速繁殖. 相似文献
90.