中国梧桐科二新种和粗齿梭国罗的补充记载

描述了国产梧酮科植物２新种,并对梭罗属的粗齿梭罗作了花的补充描述。     

New Taxa of Ribes from Sichuan

Ribes tianquanense S. H. Yu et J. M. Xu and R. moupinense Franch. var. muliense S. H. Yu et J. M. Xu (Saxifrag aceae) are described as new fromSichuan Province of China.     

金沙江河谷特有药用植物——云南百部的分类学处理

通过对云南百部（Stemona mairei（H.Lév.）K.Krause）及其形态相似种金沙江百部（S.jinshajiangensis X. D. Cong et G. J. Xu）和变种滇北百部（S.jinshajiangensis var.dianbeiensis X. D. Cong et G. J. Xu）模式标本采集地野外居群植株的实地调查和研究,发现金沙江百部及其变种滇北百部的形态特征变异式样均在云南百部形态特征的正常变异范围内,因此将金沙江百部及其变种处理为云南百部的异名,同时对云南百部的形态特征进行了补充描述。结合对云南百部6个野生居群成熟植株的开花结实特征、种子传播策略分析,对云南百部受威胁状况进行了评估。     

Two New Species of Allium L. from Sichuan

This paper reports two new species of Allium L. from Sichuan, A. xiangchengense J. M. Xu and A.guanxianense J. M. Xu. The former is related to A. hookeri Thwaites, but differs from it by its lanceolate to linear-lanceolate leaves with evidently contracted base and filaments longer than the tepals, while the latter is related to A.chienchuanense J. M. Xu, but differs from it by its terminal scape, filaments shorter than the tepals and ovary with solitary ovule in eachlocule.     

Two New Species of Codonopsis From China

Two new species of Codonopsis, namely C. parvitubulosa Z. T. Wanget G. J. Xu and C. retroserrata Z. T. Wang et G. J. Xu are described     

国产铁线莲属(毛茛科)植物小志

本文描述了国产铁线莲属２新种、１新变种,并对荔波铁线莲的形态进行了补充描述。     

中国虎耳草属(虎耳草科)二新种————班玛虎耳草和丁青虎耳草

记载了中国虎耳草属Saxifraga二新种, 即班玛虎耳草S. banmaensis J. T. Pan和丁青虎耳草S. dingqingensis J. T. Pan。其中, 班玛虎耳草仅见于青海班玛, 与小伞虎耳草S. umbellulata Hook. f. &; Thoms.近缘, 但其萼片先端具软骨质短尖头, 花瓣线形, 非提琴状长圆形至提琴形, 基部无爪, 可资区别。丁青虎耳草见于西藏丁青, 与近加拉虎耳草S. llonakhensis W. W. Smith相似, 但其萼片3脉, 于先端汇合成1疣点, 花瓣具8痂体和4-5脉, 基部截形或近耳形, 可以区别。此两种均系中国特有种, 隶属于莲座状亚组subsect. Rosulares Gornall。     

The organelle of death

The mitochondrial FOF1-ATPase proton pump is required for function of the proapoptotic protein BAX in yeast and mammalian cells Matsuyama, S., Xu, Q., Velours, J. and Reed, J.C. Mol. Cell. 1, 327–336     

云南石斛属一新变种

布朗山石斛 新变种 Dendrobium chryseum Rolfe var.bulangense G.X.Ma et G.J.Xu,var.nov.A typo differt planta manifeste nana,25～35 cm alta;foliis apice minusve hamatis;labello reniformi purpura nulla vel obscura Yunnan:Menghai,alt. 1100 m,20.May 1991,G.X.Ma 91021(Holotype,deposited in Herb.,China Pharmaceutical University) 新变种和原变种的区别在于:植株显著矮小,高25～35cm;叶先端钩转;唇瓣上无肾形紫色斑块或紫色斑块不明显。     

台湾海峡及其邻近海区珍妮水母属的研究(丝螅水母目,面具水母科)

记述了台湾海峡及其邻近海区面具水母科Pandeidae Haeckel,1870珍妮水母属faniopsis Bouillon,1980 5新种,即顶斑珍妮水母faniopsis apicispottis Xu,Huang et Lin,Sp.nov.、短距珍妮水母f.brevispura Xu,Huang et Guo,sp.nov.、大球珍妮水母f.macrobulbosa Xu,Huang et Guo,sp.nov.、南沙珍妮水母f.nanshaensis Xu,Huang et Lin,sp.nov.和蹄形珍妮水母f.unguliformis Xu,Huang et Lin,sp.nov.;并讨论了它们与近缘种的区别,同时将珍妮水母属已知种作个检索表.模式标本保存在厦门大学海洋学系.     

Extracellular polysaccharide is required for wild-type virulence of Pseudomonas solanacearum.

Several Pseudomonas solanacearum strains which produced no detectable extracellular polysaccharide (EPS) in planta had been reported to remain highly virulent when tested at high inoculum concentrations (P. Xu, M. Iwata, S. Leong, and L. Sequeira, J. Bacteriol. 172:3946-3951, 1990; P. Xu, S. Leong, and L. Sequeira, J. Bacteriol. 170:617-622, 1988). Two of these mutants, KD700 and KD710, have now been molecularly and genetically mapped to the EPSI gene cluster described by Denny and Baek (Mol. Plant-Microbe Interact. 4:198-206, 1991). When a range of inoculum concentrations was used, these two mutants and all other EPS-defective mutants tested were found to be reduced in virulence to eggplants and tobacco relative to the wild-type strain. Thus, EPS consistently is required for the wild-type level of virulence in P. solanacearum.     

四川天南星属(天南星科)一新种——川西南星

描述了四川西部天南星属(天南星科)植物一新种,即川西天南星.     

黄山产散斑壳属二新种*

散斑壳属的两个新种,即生于黄山杜鹃Rhododendron maculiferum ssp. anhweiense上的纠丝散斑壳Lophodermium implicatum和强壮散斑壳L. validum。对它们作了拉丁文特征简介、汉文描述和图解。模式标本保藏于安徽农业大学森林保护教研室(AAUFP),合肥。     

贵州五种菊头蝠的核型分析 *

采用常规骨髓细胞空气干燥法,研究了贵州5种菊头蝠的核型。贵州菊头蝠和中菊头蝠2n=62,两者染色体臂数(NF)均为60;托氏菊头蝠、小菊头蝠和栗黄菊头蝠的染色体数是2n=36,其中托氏菊头蝠和小菊头蝠染色体臂数(NF)是58,栗黄菊头蝠是60。5种菊头蝠的性别决定机制均是xY。     

中国爵床科马蓝属二新记录种

报道中国爵床科Acanthaceae马蓝属Strobilanthes Bl.两个新记录种——四列马蓝Strobilanthes quadrifaria (Wall. ex Nees) Y. F. Deng和齿叶马蓝S. serrata Imlay, 并绘制了形态图。指定了四列马蓝的后选模式。     

Structural basis for the activity of the RSK-specific inhibitor, SL0101

Inappropriate activity of p90 ribosomal S6 kinase (RSK) has been implicated in various human cancers as well as other pathologies. We previously reported the isolation, characterization, and synthesis of the natural product kaempferol 3-O-(3',4'-di-O-acetyl-alpha-l-rhamnopyranoside), termed SL0101 [Smith, J. A.; Poteet-Smith, C. E.; Xu, Y.; Errington, T. M.; Hecht, S. M.; Lannigan, D. A. Cancer Res., 2005, 65, 1027-1034: Xu, Y.-M; Smith, J. A.; Lannigan, D. A.; Hecht, S. M. Bioorg. Med. Chem., 2006, 14, 3974-3977: Maloney, D. J.; Hecht, S. M. Org. Lett., 2005, 7, 1097-1099]. SL0101 is a potent and specific inhibitor of RSK; therefore, we performed an analysis of the structural basis for the inhibitory activity of this lead compound. In in vitro kinase assays we found that acylation of the rhamnose moiety and the 4', 5, and 7-hydroxyl groups are responsible for maintaining a high affinity interaction of RSK with SL0101. It is likely that the hydroxyl groups facilitate RSK binding through their ability to form hydrogen bonds. To determine whether the SL0101 derivatives were specific for inhibition of RSK we analyzed their ability to preferentially inhibit the growth of the human breast cancer line, MCF-7, compared to the normal human breast line, MCF-10A. We have previously validated this differential growth assay as a convenient readout for analyzing the specificity of RSK inhibitors [Smith, J. A.; Maloney, D. J.; Clark, D. E.; Xu, Y.-M.; Hecht, S. M.; Lannigan, D. A. Bioorg. Med. Chem., 2006, 14, 6034-6042]. We found that acylation of the rhamnose moiety was essential for maintaining the selectivity for RSK inhibition in intact cells. Further, the efficacy of SL0101 in intact cells is limited by cellular uptake as well as possible hydrolysis of the acetyl groups on the rhamnose moiety by ubiquitous intracellular esterases. These studies should facilitate the development of a RSK inhibitor, based on the SL0101 pharmacophore, as an anti-cancer chemotherapeutic agent.     

中国黄耆属(豆科)丁字毛类群2新种——额尔齐斯黄耆和沙地黄耆

描述了产于中国新疆的黄耆属（Astragalus）丁字毛类群2新种,即额尔齐斯黄耆（Astragalus eerqisiensis Z.Y.Chang,L. R. Xu ＆ D.Podlech）和沙地黄耆（A.shadiensis L. R. Xu,Z.Y.Chang ＆ D.Podlech）.其中,额尔齐斯黄耆仅见于新疆布尔津县的额尔齐斯河流域,与哈巴河黄耆（A.habaheensis）近缘,区别在于前者小叶菱形、倒卵形或椭圆形,长15～25（30）mm,宽（3）7～12（15）mm,旗瓣长20～22（25）mm,翼瓣顶端2裂;沙地黄耆产于新疆托克逊县东北部,散生于沙地荒漠,形态上与变异黄耆（A. variabilis Bunge ex Maxim.）接近,区别在于小叶5～7（9）枚而非11～19枚,旗瓣在中部收缩,植株全体被灰色毛而呈灰色.2新种均系中国特有种,其中额尔齐斯黄耆隶属于乌拉尔组（A. Sect.Helmia Bunge）,沙地黄耆隶属于旱生组[A. Sect.Craccina（Stev.）Bunge].     

光叶云南草蔻的植物分类学研究

作者在调查云南草蔻及光叶云南草蔻资源时发现,过去在云南、广西和广东被定为光叶云南草蔻的植物为三种不同的山姜属植物,从中分出两新种:那坡山姜Alpinia napoensis H.Dong et G.J.Xu和卵果山姜 Alpinia ovoidocarpa H.Dong et G.J.Xu,并对光叶云南草蔻作了形态特征补充描述。查清光叶云南草蔻Alpinia blepharocalyx K.Schum.var.glabrior(Hand.-Mazz.)T.L.Wu仅分布云南南部及东南部,广西、广东无分布。     

刺叶柄棘豆的一个新变型--白花刺叶柄棘豆

描述了棘豆属(豆科)刺叶柄棘豆(Oxytropis acipblla Ledeb．)的一个新变型：白花刺叶柄棘豆O．aciphylla Ledeb．f．albiflora Z．Y．Chang,Z．H．Wu et L．R．Xu。原变型的花冠为红紫色或蓝紫色,而新变型的花冠为白色。