首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
王焕冲  和兆荣  孙航 《广西植物》2012,32(3):315-317
报道了蔷薇科两种悬钩子属植物在中国的重新发现,分别为美叶悬钩子(Rubus calophyllus C.B.Clark)和拟针刺悬钩子(R.parapungens H.Hara),并提供了简要的描述和标本照片。  相似文献   

2.
悬钩子属部分类群的分类订正   总被引:4,自引:0,他引:4  
李维林  贺善安 《植物研究》2001,21(3):346-349
根据野外调查和查阅标本的结果 ,对悬钩子属部分类群做了修订。将红毛悬钩子 (R .pinfaensisL啨vl.etVant.)并入椭圆悬钩子 (R .ellipticusSmith) ,栽秧泡 (R .ellipticusSmithvar .obcordatus (Franch .)Focke)提升为种 (R .obcordatus (Franch .)Focke) ;棱枝细瘦悬钩子(R .macilentusCamb .var.angulatusDelav .)并入细瘦悬钩子 (R .macilentusCamb .) ;毛叶插田泡 (R .coreanusMiq .var .tomentosusCard .)并入插田泡 (R .coreanusMiq .) ;狭叶绢毛悬钩子(R .lineatusReinw .var.angustifoliusHook .)并入绢毛悬钩子 (R .lineatusReinw .)。对针刺悬钩子 (R .pungensCamb .)及其各变种做了订正  相似文献   

3.
聂敏祥 《植物研究》1989,9(3):43-45
本文发表了江西悬钩子属一新种,即腺果悬钩子Rubus glandulosocarpus M.X.Nie  相似文献   

4.
报道了悬钩子属植物的2个中国新记录种,分别为浅裂悬钩子(Rubus polyadenus Cardot)和滇印悬钩子(R.opulifolius Bertol)。浅裂悬钩子发现于云南省东南部的河口和个旧等地,其与黔桂悬钩子(R.feddei H.Lév.Vaniot)较为相近,区别在于该种枝条、叶柄和花序轴密被浅红色具腺长刺毛,叶柄较短,叶片长卵形或近琴形,顶端急尖或渐尖,萼片三角状披针形,顶端长尾尖。滇印悬钩子新发现于云南省西北部的高黎贡山,其与拟覆盆子(R.idaeopsis Focke)较为相近,区别后者在于其小叶3~5枚,花序极短,不足3cm长,花柄很短,整个花序密集缩短成近头状。  相似文献   

5.
报道了采自西藏墨脱县悬钩子属绢毛亚组Rubus subsect.Lineati (Focke) Yü et Lu两个中国新纪录种,即酒红悬钩子R.calophyllus Clarke.和炫丽悬钩子R splendidissimus Hara.  相似文献   

6.
报道了采自西藏墨脱县悬钩子属绢毛亚组Rubus subsect. Lineati (Focke) Yü et Lu两个中国新纪录种, 即酒红悬钩子R.calophyllus Clarke.和炫丽悬钩子R.splendidissimus Hara.  相似文献   

7.
熊先华  徐波  鞠文彬  高云东  邓亨宁  高信芬 《广西植物》2018,38(11):1411-1903/11/21
该文在野外调查、标本采集、标本查阅与鉴定及文献考证的基础上,对西藏墨脱县产的蔷薇科悬钩子属植物进行了系统整理。结果表明:目前发现该区共有悬钩子属植物28种4变种,其中Rubus lineatus Reinw. var. glabrior Hook. f.为中国分布新记录植物,小柱悬钩子(R. columellaris Tutcher)、红毛悬钩子(R. wallichianus Wight et Arn.)、独龙悬钩子(R. taronensis C. Y. Wu ex T. T. Yu et L. T. Lu)和疏松悬钩子(R. efferatus Craib)为西藏分布新记录植物。该文还对《中国植物志》和Flora of China中该属部分学名的不恰当使用进行了探讨。  相似文献   

8.
江西悬钩子属的分类和地理分布   总被引:5,自引:0,他引:5  
通过野外调查和查阅大量标本和文献,对江西悬钩子属植物的分类和地理分布进行了较为系统的研究。江西境内共有悬钩子属植物43种7变种2变型,其中红花悬钩子Rubus inopertus(Diels)Focke,大红泡R.eustephanus Focke ex Diels,深裂锈毛莓R.reflexus Ker var.lanceolobus Metc为江西新分布。编制了检索表,并讨论了江西悬钩子属植物的地理分布。  相似文献   

9.
秦巴山区悬钩子植物的种质资源   总被引:19,自引:0,他引:19  
秦巴山区有野生悬钩子38种12变种,是我国悬钩子属植物比较集中的分布区之一,对秦巴山区悬钩子种质资源的系统调查和综合分析结果表明:1.悬钩子类果实中维生素类(尤其是维生素E)和SOD等生物活性物质的含量异常高,蛋白质、氨基酸、有机酸和矿质元素含量不同程度地高于栽培水果,是一种急待开发利用的野生果树。2.黄果悬钩子、粉枝莓、华中悬钩子、弓茎悬钩子、喜阴悬钩子、插田泡、茅莓、山莓和高粱泡等具有直立生长、植株健壮、少刺或无刺、丰产、抗寒耐旱等经济性状,是悬钩子类果树选种和育种的优良种质材料,其中有些种类还可以直接引种栽培。3.悬钩子植物的美化环境和水土保持作用及药用保健价值也应受到重视。  相似文献   

10.
悬钩子叶片的营养成分   总被引:16,自引:0,他引:16  
对中国东南部28种悬钩子叶片的营养成分进行了分析,结果表明悬钩子叶片含丰富的人体必需营养素和小分子抗氧化剂,具有营养的保健双重价值。叶片中某种营养成分含量的高低表现出种和种内不同产地的差异,而与该属内的组别无关。文章就悬钩子叶片的特点及其利用价值和利用方向进行了评价。  相似文献   

11.
12.
13.
14.
15.
In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980.  相似文献   

16.
17.
18.
Shapes of curves of pH-dependence of reactions   总被引:14,自引:14,他引:0  
A simple case is considered in which the rate of a two-step reaction depends on pH because the intermediate formed in the first step has to gain (or lose) a proton before it can react in the second step, and in which the rate-determining step therefore changes with pH. The curves of reaction rate against pH are shown to be symmetrical, and the sharpest peak possible has a width at half its height of 1.53pH units, i.e. of 2log(3+2 radical2). Any particular curve for this situation proves to be identical with a curve that could be generated for the pH-dependence of a single-step reaction in which the rate is proportional to the concentration of a particular ionic form of a reactant. Curves for the latter situation, however, can have forms impossible for the former case in which the rate-determining step changes, but only if the protonations that activate and deactivate the reactant are co-operative. The peak can then become even sharper, and its width at half its height can fall to 1.14pH units, i.e. to 2log(2+ radical3).  相似文献   

19.
20.
Dietary intakes of tomatoes and tomato products containing lycopene have been shown to be associated with decreased risk of chronic diseases such as cancer and cardiovascular diseases in numerous studies. Serum and tissue lycopene levels have also been inversely related to the risk of lung and prostate cancers. Lycopene functions as a very potent antioxidant, and this is clearly a major important mechanism of lycopene action. In this regard, lycopene can trap singlet oxygen and reduce mutagenesis in the Ames test. However, evidence is accumulating for other mechanisms as well. Lycopene at physiological concentrations can inhibit human cancer cell growth by interfering with growth factor receptor signaling and cell cycle progression specifically in prostate cancer cells without evidence of toxic effects or apoptosis of cells. Studies using human and animal cells have identified a gene, connexin 43, whose expression is upregulated by lycopene and which allows direct intercellular gap junctional communication (GJC). GJC is deficient in many human tumors and its restoration or upregulation is associated with decreased proliferation. The combination of low concentrations of lycopene with 1,25-dihydroxyvitamin D3 exhibits a synergistic effect on cell proliferation and differentiation and an additive effect on cell cycle progression in the HL-60 promyelocytic leukemia cell line, suggesting some interaction at a nuclear or subcellular level. The combination of lycopene and lutein synergistically interact as antioxidants, and this may relate to specific positioning of different carotenoids in membranes. This review will focus on the growing body of evidence that carotenoids have unexpected biologic effects in experimental systems, some of which may contribute to their cancer preventive properties in models of carcinogenesis. Consideration of solubility in vitro, comparison with doses achieved in humans by dietary means, interactions with other phytochemicals, and other potential mechanisms such as stimulation of xenobiotic metabolism, inhibition of cholesterogenesis, modulation of cyclooxygenase pathways, and inhibition of inflammation will be considered. This review will point out areas for future research where more evidence is needed on the effects of lycopene on the etiology of chronic disease.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号