家兔急性肝损伤条件下甘遂反甘草的实验研究

在30只急性肝损伤家兔上对甘遂配伍甘草的怍用进行了实验研究。内容包括临床观察,SGPT 值测定、病理剖检及组织学检查。试验结果表明,甘遂与甘草按1:1,1:2和2:1的比例配伍并不出现明显的刺激作用和毒性反应,也不会使病情加重或减轻.     

广西3种新记录外来入侵植物

报道了采自防城港市的3种广西新记录外来入侵植物. 它们是紫斑大戟 Euphorbia hyssopifolia L.、翼茎阔苞菊 Pluchea sagittalis (Lam. ) Cabrera和丝毛雀稗 Paspalum urvillei Steud.. 标本存放于华南农业大学林学院植物标本室 (CANT).     

60Co γ射线对续随子干种子的生理损伤

以1Gy/min的剂量率,用不同剂量（0~800Gy）的60Co γ射线辐照续随子干种子,对M₁种子萌发情况及苗期性状进行调查。分析结果显示,在供试剂量范围内,辐照对续随子发芽率无明显影响,对发芽势、发芽指数、活力指数及幼苗生长量有显著或极显著的抑制效应;且抑制效应随剂量的增加和幼苗的生长而增大。在以上数据分析的基础上,以活力指数下降一半时的脊梁VID₅₀及幼苗半致癌剂量GR₅₀为标准,通过回归分析初步预测,供试续随子适宜辐照诱变剂量约为400~600Gy.     

千金子辨析

2个"千金子"是一个在概念和实践中都需要加以澄清的"同名异物"。农业生产中的千金子是禾本科的1年生农田恶性杂草,防治难度大,严重影响现代水稻生产,已引起各国的重视。中药材上的千金子系为大戟科植物续随子的干燥成熟种子,有毒,需炮制后方可服用,有逐水消肿、破癥杀虫之功效,还可治疗肿瘤和白血病,植株更是一种很有发展潜能的可再生能源植物。     

植物狼毒大戟对钉螺及血吸虫毛蚴的影响

为了探讨植物狼毒大戟对钉螺及血吸虫毛蚴的影响,分别用大戟科大戟属狼毒大戟根的提取物1与提取物2液萃取物配制成的5.0,2.5,1.25,0.625,0.3125g/L的药液浸杀钉螺及血吸虫毛蚴,并测定了被浸杀钉螺体内糖原与蛋白质的含量,同时检测了该药对水生动物鱼的毒副作用。试验结果显示,狼毒大戟根水煮液在浓度为2.5g/L时经过24h,48h,72h浸杀钉螺的死亡率分别为：36.7%,66.7%,93.3%。而以70%乙醇提取液经过相同时间浸杀钉螺的死亡率分别为：43.3%,86.7%,96.7%。同时被狼毒大戟水煮液浸杀的钉螺体内糖原含量明显下降,减少幅度从9.61%到33.60%,表明狼毒大戟通过影响钉螺的能量代谢而抑制其生长。蛋白质的含量减少不显著。     

~(60)Co-γ射线辐射对一品红7项生理指标的影响

探讨了60Co-γ射线辐射对一品红7项生理指标的影响。结果表明:淀粉含量与辐射剂量之间呈显著正相关,叶绿素B与叶绿素A之间呈极显著正相关,与蛋白质含量呈显著负相关;淀粉含量以80 Gy辐射处理值最高,80 Gy辐射处理的叶绿素B、花色素含量均居第二,叶绿素A、可溶性糖含量居第三,类胡萝卜素含量居第六,因此综合7项生理指标的生理生化功能,一品红7项生理指标以80 Gy辐射表现较为适中。     

Antimicrobial activity of Caesalpinia pulcherrima, Euphorbia hirta and Asystasia gangeticum

The ethanolic extracts of the dry fruits of Caesalpinia pulcherrima, aerial parts of Euphorbia hirta and flowers of Asystasia gangeticum were tested for antimicrobial activity. The three plants exhibited a broad spectrum of antimicrobial activity, particularly against Escherichia coli (enteropathogen), Proteus vulgaris, Pseudomonas aeruginosa and Staphylococcus aureus.     

绿玉树的利用价值及其国内研究进展

介绍了绿玉树不仅是一种高效的能源植物,还具有药用价值、害虫防治价值、生态价值等许多利用价值。同时,从绿玉树在我国的分布情况,绿玉树碳氢化合物及甾醇含量分析,种质资源多样性、组织培养和栽培技术等方面综述了绿玉树在国内的研究进展,以期实现绿玉树产业规模化种植,从而为人类带来巨大利益。     

一品红的组织培养研究

以一品红腋芽、顶芽、茎段、嫩叶为初次诱导外植体,对一品红的组织培养途径进行研究,建立了一品红植株再生体系.结果表明:组织培养的取材部位为腋芽、顶芽和茎段.诱导愈伤组织外植体为茎段,培养基为MS+6-BA 0.5 mg/L+2,4-D 2.0 mg/L+蔗糖30 g/L.诱导丛生芽的外植体为腋芽、顶芽和愈伤组织,培养基配方为腋芽、顶芽:MS+6-BA 0.6mg/L+NAA0.1 mg/L+蔗糖30 g/L;愈伤组织:MS+6-BA 2.0 mg/L+NAA 0.1 mg/L+蔗糖30 g/L.丛生芽继代增殖的培养基配方为MS+6-BA 0.5mg/L+NAA 0.1mg/L+蔗糖30 g/L.生根培养基配方1/2MS+NAA 1.0 mg/L+蔗糖30 g/L.     

The impact of cropping on weed species composition in rice after fallow across a hydrological gradient in west Africa

In a 5-year experiment, weed species composition in rice was recorded at different positions along the toposequence, from the rain-fed upland to the irrigated valley bottom. A total of 107 species was recorded, 70 of which occurred in more than 1% of the total of 465 samples. Canonical correspondence analysis was used to explore the changes in weed flora over time in the different rice-growing environments. There were substantial differences in the composition of weed flora between the differing environments and years. On the upland sites, there was a pronounced shift from perennial grasses, including Imperata cylindrica (L.) Raeuschel and Pennisetum purpureum Schum., to annual grass weeds, such as Digitaria horizontalis Willd., Chloris pilosa Schum. and Eleusine indica (L.) Gaertn. The forbs Boerhavia spp. and Euphorbia heterophylla L. also increased in abundance, whereas others, such as Aspilia bussei Hoffm. & Muschl. and Laggera aurita (L.f.) Sch. Bip. ex C. B. Clarke, declined. The total number of species in the upland site declined from 30 to 11 between 1992 and 1996 compared with 11 to eight species in the same period in the irrigated lowlands. Although the numbers of species recorded in the lowlands were lower and more stable over time, there was an increase in problem grass weeds, such as Echinochloa crus-pavonis (Kunth.) Schult. in the irrigated lowlands and Leersia hexandra Sw.in the rain-fed lowlands.