汉水上游旧石器的新发现

汉中盆地地处我国华南与华北的一个中间过渡带。在汉中盆地内旧石器又有新的发现,同时和旧石器一起还发现了哺乳动物化石,有9属9种。哺乳动物化石的发现,对于确定旧石器的时代有所帮助。     

消息与动态

山西永济发现中更新世动物化石及旧石器地点 1979年11月,中国科学院古脊椎动物与古人类研究所龙玉柱与山西省考古研究所王向前等人在山西省永济县介峪口进行地质调查时发现了一处第四纪哺乳动物化石及旧石器地点。 1984年11月底,笔者和山西大学历史系考古专业学生到该地点进行野外实习时,在这一地点以东约2华里处又发现了另一个哺乳动物化石及旧石器地点。高,哺乳类化石计有纳玛象(Palaco     

貴州黔西县观音洞試掘报告

我所贵州野外队,在贵州省博物馆大力协助下,于1964年冬,在贵州省毕节专区黔西县沙窝区沙井公社井山观音洞里,发现了富含哺乳动物化石和旧石器的地层。我们作了初步的试掘,得到了不少哺乳动物化石和百余件石器、石片、石核等材料。这是我国南方洞穴中首次发现的有哺乳动物化石与旧石器共生的地点。现将该地点试掘所得的结果,简略报导于后。     

山西襄汾县丁村附近103地点的哺乳动物化石

地质说明在山西襄汾县丁村附近发掘旧石器的时候,在丁村附近许多地点发现了许多化石。其中90,91,92,93,94,96,97,98,99,100,102等11个地点都有旧石器和哺乳动物化石,100地点更有三枚人类的牙齿发现,这许多化石和旧石器都是同一地质时代,已有综合报告发表(裴文中等,1958)。此外,在汾河西岸,与柴庄车站相对的第103地点,在已经有些胶     

甘肃庆阳更新世晚期哺乳动物化石

有关庆阳——中国第一块旧石器发现地区——第四纪哺乳动物化石的记载较为少见。1962年胡月长康同志曾报导一批第四纪哺乳动物化石,但多数化石没有确切的地层层位。1963年5—7月间我们在甘肃庆阳发现了几个第四纪哺乳动物化石地点,这里仅记述庆阳龙骨沟地点的晚更新世哺乳动物化石。这一地点除含有较多的哺乳动物化石及旧石器时代文化遗迹外,并有完整的地层剖面,这为晚更新世黄土和河湖相沉积关系的研     

河北阳原小长梁遗址哺乳类化石及其时代

小长梁遗址中的旧石器以小型石器为主,打制技术相当进步,其类型与欧洲某些更晚期的旧石器有某些相似之处,而与旧石器伴生的哺乳动物化石则是泥河湾早更新世的重要成员,古地磁初步测试结果接近167万年。     

辽宁营口金牛山发现的第四纪哺乳动物群及其意义

解放前,东北更新世地层与哺乳动物化石的研究,成果甚少,辽宁省几无报道。解放后,在这方面的研究有所进展。1957年,周明镇和薛祥煦记述了建平和康平发现的更新世晚期的动物化石;《东北第四纪哺乳动物志》(1958)一书,记述的主要是吉林榆树发现的材料,也提到辽宁的某些哺乳动物化石的发现;1964年,丁梦麟等对朝阳-赤峰间发现的哺乳动物化石作了报道,并探讨了这一地区的第四纪地层划分的问题。在无产阶级文化大革命的推动下,辽宁省古人类、旧石器文化和第四纪哺乳动物化石的研究出现了崭新面貌,改变了东北地区无可靠的旧石器文化的局面,部分研究论文已经发表。在这些文     

泥河湾盆地虎头梁发现披毛犀化石

泥河湾盆地是中国北方第四纪地层发育最为齐全的地区之一,多处哺乳动物化石产地及旧石器遗址中均有披毛犀化石产出（卫奇,１９９７）,但报道产出的化石多数只是骨体碎片或零星的牙齿。１９６５年夏天,中国科学院古脊椎动物与古人类研究所前太原工作站王择义、王向前和武文杰在泥河湾盆地河北省阳原县东城乡虎头梁一带进行旧石器调查时,从褐黄色含细砾砂质粘土层中采集到一些披毛犀化石,产出地点位于虎头梁旧石器遗址ＮＥ５５°方向３５０ｍ处,地层层位位于旧石器产出层位之下的泥河湾组上部,时代为早更新世末期。这些技毛犀化石是该…     

铜梁旧石器遗址自然环境的探讨

<正> 在我国南方的洞穴中发现了丰富的、更新世不同时期的哺乳动物化石、古人类化石和旧石器,但洞外第四纪地层中的发现物则不多,比较重要的有云南元谋早更新世哺乳动物群和晚更新世资阳人哺乳动物群。1976年春发现了铜梁旧石器遗址,在文化层中发现了较丰富的植物和哺乳动物化石,在其上覆的地层中,还发现一些新石器时代遗物,这就     

辽宁海城小孤山遗址发掘简报

从小孤山晚更新世洞穴遗址出土了38种哺乳动物化石、上万件石制品以及一批制作精美的骨角制品和装饰品。石器工业在技术与类型上和华北旧石器关系密切。大致相同的骨针和穿孔兽牙于三十年代曾在周口店山顶洞遗址发现过,但是与欧洲马格德林鱼叉相似的角制鱼叉在中国旧石器文化中是头一次发现。     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

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.