禄丰古猿化石地点的植物叶化石

1987年,在云南禄丰古猿化石地点D剖面第4层(薄层黑色炭质粘土与灰色细砂互层)发现植物叶部印痕化石,经鉴定属壳斗科绝灭的雷龙潭槲叶(Dryophyllum relongtanense Colani),该种植物常参与组成亚热带至暖温带的常绿阔叶林或常绿与落叶阔叶混交林。     

云南禄丰古猿化石地点的豪猪化石

描述了产自云南禄丰古猿化石地点的豪猪化石禄丰豪猪 (新种 ) (Hystrixlufengensissp .nov.)。这是一种较原始的豪猪。它的个体中等 ;两上颊齿列往前靠近 ;下颌骨骨体较低 ,齿隙稍凹 ,其前端高于下颊齿冠面 ;颊齿齿冠较低 ;上颊齿舌侧沟横向较短 ;P4大 ,前尖通常孤立 ,中附尖很发达 ,不与中脊连 ;M3较少退化 ;上颊齿具 3齿根 ,大的内侧齿根具明显纵沟 ;下颊齿通常具 4齿根等。形态结构分析表明 ,H .lufengensis仅比H .parvae进步 ,比H .primigenia和H .sivalensis及其他种都原始。它可能代表亚洲目前已知最早、最原始的豪猪。其产出时代为晚中新世保德期 (狭义 )的较早期 (距今约 8Ma)。     

云南禄丰古猿化石地点的犀科化石

描述了产自云南禄丰古猿化石地点的犀科化石禄丰无鼻角犀新种(Acerorhinus lufengensis sp. nov.)和林氏山西犀相似种(Shansirhinus cf.S.ringstroemi)。A.lufengensis的个体较大;原尖不收缩或微弱收缩,次尖几乎不收缩,反前刺缺失或非常微弱;前臼齿前尖肋强壮;臼齿前刺短小,无内齿带,除M3外无小刺;下前臼齿的下内脊呈横向;下门齿呈特别粗壮的獠牙状。从A.lufengensis的一系列进步性状判断,它的时代至少不会早于M3外脊和后脊分界明显的A.palaeosinensis,应相当于晚中新世的NMU10或MN12,年龄约7 Ma。S.cf.S.ringstroemi具有丰富的釉质褶皱、微弱的前尖肋、非常强大的前刺、强烈收缩的原尖、发达的齿桥和中窝、角状的U形内谷、连续的内齿带、膨大成方形的次尖等。在这个种内,体型有增大的趋势,釉质褶皱向增强的方向发展,中窝数量增多,而禄丰标本在尺寸上略小于甘肃临夏的上新世最早期材料,釉质褶皱也相对更弱,中窝仅有一个。因此,禄丰S.cf.S.ringstroemi的时代应该略早,出现于晚中新世的7 Ma左右是比较合理的解释。     

云南禄丰晚中新世古猿地点的仓鼠类化石

述了采自云南禄丰晚中新世石灰坝组的仓鼠类化石—新种──Kowalskiahanaesp.nov.。后脊Ⅱ和三齿根在M1中所占的比例、第一臼齿前边尖的宽度以及第三臼齿的退化程度表明,新种的演化水平与欧洲瓦里士晚期或土洛里早、中期的K.schaubi,K.fahlbuschi和K.skofleki接近,它是我国现知科氏仓鼠属中构造最原始的一种。     

禄丰古猿化石地点的鱼化石

在禄丰古猿化石产地采获许多鲤的咽喉齿化石,由形态特征看,相近于现代广泛分布的鲤(Cyprinus carpio Linn.)的咽喉齿,当代表其早期记录。现今云南一带生存有多种鲤,可能为其繁衍的后代,且相当繁盛。这一发现为鲤属(Cyprinus)起源于亚洲提供了化石依据。     

禄丰古猿化石地点地层概述

本文较详尽地记述了云南禄丰古猿化石地点附近的地质、地貌、地层情况以及产出古猿及大量脊椎动物化石的剖面。     

禄丰古猿化石地点偶蹄目化石初步研究

云南,禄丰古猿化石地点经9次发掘,偶蹄目化石与哺乳类其他目一样,不仅材料增多,而且发现了新的属、种。经初步研究,由已记述的12种增加到22个种类,其中一部分是与华北时代相当于保德期的动物群有密切关系的属、种,另一部分是与南亚印、巴次大陆中西瓦立克动物群有亲缘关系的类型,其地质时代为中新世晚期,相当于欧洲陆相地层哺乳动物分期的土洛里。     

禄丰古猿化石地点食肉目化石的初步整理

本文对禄丰腊玛古猿化石地点的食肉目化石予以分类记述和简要分析。     

云南禄丰、元谋晚中新世古猿地点始鼠科化石

<正>始鼠科(Eomyidae)是一类绝灭了的啮齿类动物,渐新世和中新世时广布全北区,但亚洲远没有欧洲和北美常见。中国含始鼠类化石地点不多,发现的属只有渐新世的Eomys、Eomyodon和Pseudotheridomys,以及中新世的Keramidomys和Leptodontomys(Zheng and Li,1982;Falhbusch et al．,1983;Wang and Emry,1991;Qiu,1996;Wang,2002)。本文描述的云南始鼠类化石,系1983年在禄丰石灰坝和1999、2000年在元谋雷老两个古猿地点采集到的。材料不多,但至少代表始鼠科的两个新属,为我国惟一采自南方,并与古猿类共生的稀少啮齿类动物。新种的模式产地均为禄丰石灰坝。     

云南禄丰古猿地点的松鼠类化石

记述了云南禄丰晚中新世石灰坝古猿地点发现的松鼠科化石。禄丰石灰坝动物群的松鼠动物共有 7属 7种 :地松鼠Sciurotamiaswangisp .nov .,树松鼠Tamiopssp .、Callosciurussp .、Dremomysprimitivussp .nov .和飞松鼠Miopetauristaasiaticasp .nov .、Hylopetodondianensegen .etsp.nov.、Pteromyinaegen.etsp .indet.。该动物群松鼠类动物的组成以树松鼠和飞松鼠为主 ,反映了较为湿润的热带—亚热带森林环境。在动物地理上 ,其成员几乎局限于东南亚分布 ,具有浓厚的现代东洋界色彩     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.