辽西中上侏罗统土城子组植物化石的新发现

报道产自辽宁北票三宝营土城子组２种木化石及１０种植物化石（包括５新种）。它们反映了干旱气候条件下沙漠绿洲型的植被特征,时代属时代属中晚侏罗世。     

陷胸式蜂亚科（昆虫纲）化石在我国辽西上侏罗统的发现及其系统演化

描述产自辽宁北票上园地区黄半吉沟上侏罗统义县组下部膜翅目昆虫化石1新属新种Trematothoracoides liaoningensis gen.et sp.nov.,归入薤式产（Sepulcidae)中的陷胸茎蜂亚科（Trematothoracinae)。这是首次在我国发现可行的陷胸茎蜂化石,也是该亚科在侏罗纪的产次报道,分支分析结果表明Trematothoracinae为一单系类群。Thoracotrema与Prosyntexis进化程度较高,构成一对姊妹群,同时又是Trematothorax的姊妹群,Trematothoracoides最为原始,为Thoracotrema Prosymtexis Trematothorax的姊妹群。     

广西凌云县罗楼地区早三叠世牙形石

罗楼地区下三叠统,经赵金科（１９５９）研究显示,最低层位为Ｖishnuites marginalis菊石带（Gyronitan阶）,张舜新（１９９０）研究广西凤山金下三叠统形石时,未发现最高的牙形石带,当前研究发现,罗楼地区下三叠统牙形石丰富,可识别出Ｈindeodus parvus,Isarciclla staeschei ,Neospathodus waageni,Neospathodus novaehel-landiae,Neospathodus homeri-Neospathodus triangularis,Chiosella timorensis6个牙形石带（组合带）,从而表明该地区不但存在下三叠统底部层位Ｏtoceratan阶,而且存在下三叠统最高的牙形石带,牙形石组合面貌和岩相显示,该牙形石动物群生活环境与田东县作登地区同属盆地相环境。     

西藏拉萨地区三叠系诺利阶牙形石分带及其国际对比

麦龙岗剖面位于西藏拉萨地区达孜县麦龙岗村 (N2 9°5 6′0 6″ ,E91°2 7′5 5″)。麦龙岗组中共发现牙形石 7属 :Epigondolella ,Hindeodella ,Priniodella ,Xaniognathodus,Lonchodina ,Metalonchodina和Enantiognathus属。其中Epigondolella属有 9种 ,包括 1新种和 1未定种 ,它们是E .primitia ,E .spiculata ,E .cf.spiculata ,E .tozeri,E .violinformissp .nov .,E .cf.triangularisuniformis,E .postera ,E .bidentata ,E .sp .。基于本次发现的化石材料 ,对西藏林周地区麦龙岗组进行新的牙形石带划分。自下而上划分为 :?Epigondolellaprimitia ,E .spiculata ,E .tozer i,E .postera和E .bidentata等带。与毛力等 (1987)、Orchard(1983,1991,1994 )和Krystyn(1977)的划分方案进行对比和讨论     

桂林上泥盆统的串管海绵

串管海绵的Amblysiphonella属在桂林地区融县组的发现,填补该属在晚泥盆世地质历程中的空白。在此之前,国内、外已出版地质文献中未记载该属在泥盆系发现的种。     

山东章丘上新世巴漏河组和更新统孢粉植物群

山东章丘巴漏河组和上覆更新统孢粉植物研究表明,当地上新世植物群的分布类型趋于单调,草本植物和部分广布型植物繁盛;更新世植物群的成分变得更加贫乏,其中,第三纪常见的喜暖类型已全部消失,而广布型植物类型得以进一步发展。植物群所反映的气候较中新世趋于干冷,与我国华北地区晚第三纪以来植物群的总体发展规律相一致。巴漏河组在层位上与临朐和昌乐等地的尧山组相对比,当前研究表明,以往报道的尧山组底部沉积夹层中的孢粉组合,其时代与山旺组相接近,而不同于巴漏河组;孢粉证据支持将其归于山旺组的划分意见。通过比较,建立巴漏河组与山东北部钻孔剖面明化镇组上段孢粉组合的对比比较。     

Sauropod dinosaurs from the Lower Cretaceous of eastern Asia: taxonomic and biogeographical implications

Sauropod dinosaurs are poorly represented in the Lower Cretaceous of eastern Asia. Here, we describe a number of isolated sauropod teeth from the Kuwajima Formation (?Berriasian–?Hauterivian) of Shiramine, Japan. The mosaic of shared derived characters and symplesiomorphies displayed by the teeth indicate that they are referable to a basal member of the titanosauriform radiation. A taxonomic review of previously described sauropod specimens from eastern and south–eastern Asia reveals that a diversity of sauropods (including a titanosaurian, a basal titanosauriform and a ?euhelopodid, as well as several forms of indeterminate systematic position) was present in this region in the Early Cretaceous. This diversity conflicts with previous suggestions that eastern Asia was biogeographically isolated from the rest of Laurasia until the late Early Cretaceous and that the sauropod fauna was limited to the endemic East Asian clade Euhelopodidae. The presence of titanosauriform sauropods in the basal Cretaceous of Japan and Thailand indicate that the proposed faunal isolation of eastern Asia ended approximately 20 myr earlier than usually suggested.     

中国内蒙古中侏罗世脉翅目昆虫化石—新科(英文)

建立脉翅目昆虫化石新科———Grammolingiidaefamnov .,并描述该科化石 3新属 6新种 :Grammolingiaboigen .nov .ofsp .nov .,Litholingiarhoragen .nov .ofsp .nov .,Litholingiaeumorphagen .nov .ofsp .nov .,Litholing iapolychotomagen .nov .ofsp .nov .,Leptolingiajurassicagen .nov .ofsp .nov .,Leptolingiatianyiensisgen .nov .etsp .nov ..给出了新科的属级检索表 ,描述的所有模式标本均采自于内蒙古自治区宁城县中侏罗世九龙山组地层中。标本分别保存在义县博物馆和首都师范大学生物系。本次发现再次表明目前关于脉翅目昆虫的认识仍然十分贫乏。     

分离和克隆小鼠ES细胞集落的主要影响因素

目的　研究不同培养条件分离和克隆小鼠ES细胞集落的效率。方法　以PMEF饲养层、NIH3T3细胞饲养层或培养液中加入LIF为培养条件 ,分离和克隆昆明小鼠ES细胞集落 ,比较其效率。结果　饲养层的培养条件明显优于培养液中加入LIF的培养条件 ;有饲养层的培养条件下 ,桑椹胚的ES细胞集落出现率显著低于囊胚 ;两种饲养层培养囊胚 ,其ES细胞集落的出现率差异无显著性。结论　以PMEF或NIH3T3细胞作饲养层 ,培养昆明小鼠的囊胚 ,适时离散ICM ,是比较理想的分离ES细胞集落的方法。