广西来宾合山上二叠统腹足类化石

本文记述的材料,是我所二叠一三叠系界线研究队的同志,于1978年春采自广西来宾合山马滩剖面.在龙潭组的灰黑、黑色中层石灰岩,产有腹足类Bellerophon sp. 2, Magnicapitatus angulus Wang, Murchisonia sp., Omphaloptycha angustaperta sp. nov. Guizhouspira alticonica Wang, G. gibbicirelloides sp. nov.和(竹蜓)类Eoverbeekina, Sphaerulina of. cressispira Lee.腹足类的Guizhouspira alticonica Wang, Magnicapitatus angulus Wang 两种,曾见于贵州西部的相同层位,Magnicapitatus属最早发现在欧洲南提罗(Sudtirol)地区的神螺灰岩,笔者认为当前含腹足类化石的层位,可与贵州西部的龙潭组相比,与南提罗地区的神螺灰岩层,亦可对比.在长兴组的灰黑、深灰色中层或中薄层石     

青海三叠纪腹足类化石

本文研究的腹足类化石是由青海地质科学研究所于1972、1978、1979三年内在青海玛(王多)县、都兰县采得的;另外青海省地质局第二区测队在治多县采得两块标本,一并在此描述。这些化石经笔者等鉴定共有13属19种,其中有8新种。青海南部三叠纪的腹足类至今尚未正式报道过,本文填补了这一空白。玛(王多)县洪水川群粉砂质板岩中产有Worthenia granatocarinata sp. nov.,与它们共生的头足类有Ussuriidae,其地质时代为早三叠世,所以腹足类化石也为同期产物。玛(王多)县闹仓坚沟组灰黑色砂质灰岩中产有腹足类Euryalox bellisculptoides sp. nov., Vistilia waristricta sp. nov., Pleurotomaria frechi Koken。在长石硬砂岩、灰—灰黑色生物灰岩及钙质粉     

第六届国际刺丝胞化石(包括古盃与海绵)会议将于1991年9月在联邦德国明斯特市召开

一、前言1982年,中国科学院南京地质古生物研究所新疆地层古生物研究队在准噶尔盆地东南缘吉木萨尔地区考察时,笔者之一(朱祥根)曾在大龙口剖面小龙口组采到一批腹足类化石。1983年和1985年又进行了化石的补充采集和详细的地层工作,采获丰富的腹足类化石,计得2属、3种(包括1新属、2新种),它们是Xinjiangospira rotundata gen. et sp. nov., Xinjiangospira cf. gondwanica (Cox), Bernicia? jimsarensis sp. nov.。     

贵州凯里地区早中寒武世凯里组的Bathynotus

一、前言1982年,中国科学院南京地质古生物研究所新疆地层古生物研究队在准噶尔盆地东南缘吉木萨尔地区考察时,笔者之一(朱祥根)曾在大龙口剖面小龙口组采到一批腹足类化石。1983年和1985年又进行了化石的补充采集和详细的地层工作,采获丰富的腹足类化石,计得2属、3种(包括1新属、2新种),它们是Xinjiangospira rotundata gen. et sp. nov., Xinjiangospira cf. gondwanica (Cox), Bernicia? jimsarensis sp. nov.。     

四川、贵州、云南、广西的一些二叠纪腹足动物化石

本文共描述腹足动物化石8属9种,其中8新种,名称如下:Cylicioscapha longlingensis sp. nov., Baylea heterocarinata sp. nov., Callistadia qinglongensis sp. nov., Shwedagonia of. orientalis Yu, Peruvispira lingshuiensis sp. nov., Porcellia lingshuiensis sp. nov., P. magninodosa sp. nov., Discotomaria xingwenensis sp. nov., Anomphalus weixinensis sp. nov.. 上述腹足类化石的标本是1980年2月至1981年1月,笔者写作研究生毕业论文期间在     

甘肃泥盆纪头足类的一新属——甘肃角石

本文描述的头足类化石,系韩乃仁于1968年,采自甘肃省宕昌县,位于Stringocephalus层位之上,经研究后定为一新属——甘肃角石Gansuceras gen. nov.;同层位的有腕足类Indospirifer sp.;珊瑚Pseudomicroplasma sp., Temnophyllum sp.,从生物群的面貌来看,时代应为中泥盆世.陈向安帮助鉴定薄片,在此谨致谢意.     

黑龙江省东部早白垩世的一些海相和半咸水相腹足类

描述黑龙江省东部上云山组和大架山组腹足类化石4属(Mathilida,Uchauxia,Nododelphinula,Trochactaeon)7种,其中2新种：Uchauxia yunshanensis sp．nov．,Nododelphinula dajiashanensis sp．nov．。它们均是特提斯海区早白垩世腹足动物群中常见分子,根据这些腹足类化石的分布和对比,其地层时代应为早白垩世阿普第期一阿尔必期。文内阐述上云山组沉积环境——近高潮附近的泥滩或泥湾,而大架山组沉积环境——低潮线附近浅水。     

广西泥盆纪的一些腹足类化石

据文献记载,广西泥盆纪腹足类化石仅有Pleurotomaria (Euryzone) itys, P. (E.)de-phinuloides, (Schlotheim), Hormotoma sp.,Platyceras sp.。近几年来,笔者在鉴定地质队的标本时,发现广西泥盆纪腹足类化石相当丰富,广布于各种相区。目前共发现化石点26处(插图1),共17个属。这些腹足类多数生活在浅海陆棚地带,与底栖的腕足类、珊瑚共生,在象州型和过渡型相区化石比较丰富,南丹型相区化石较少。其层位分布见表1。     

新疆西准噶尔地区泥盆-石炭系界线附近的石燕贝类腕足动物北大核心CSCD

系统描述采自新疆和布克赛尔蒙古自治县和什托洛盖镇附近上泥盆统—下石炭统的3个剖面(布龙果尔剖面、布克河剖面和俄姆哈剖面)上的石燕贝类,总计6属7种:Austrospirifer?sp.,Spirifer ga peevi Simorin,Unispirifer persianum Brice,Syringothyris texti formis F M Zhang,Syringothyris hannibalensis(Swallow),Histosyrinx sp.及Tylothyris sp.,其中,Austrospirifer?sp.,Syringothyris hannibalensis(Swallow)及Histosyrinx sp.产自法门阶上部;其余属种产自上泥盆统—下石炭统。S.textiformis及S.hannibalensis的腹壳内部结构以具有发育的管孔及缺失中隔板为主要特征,不同的是前者腹壳后部次生加厚强烈、管孔长度较大。文中早石炭世的腕足类数量相对较少,难以对泥盆-石炭纪界限上下的石燕贝类面貌进行比较,暂将西准噶尔地区晚泥盆世—早石炭世的石燕贝类(不含弓石燕类)的腕足动物一并称为Syringothyris-Spirifer动物群,在组成上与哈萨克斯坦、俄罗斯库兹涅茨盆地、莫斯科盆地及北美同期的化石组合较为相似,与华南有较大差异。     

甘肃兰州盆地咸水河组下红泥岩中的小哺乳动物化石

兰州盆地咸水河组下红泥岩共产有15属25种哺乳动物化石。位于下红泥岩中部的峡沟和上西沟等地产有11属20种化石（Amphechinus cf. A. rectus, A. cf. A. minimus, Amphechinus sp., Soricidae indet., Sinolagomys kansuensis, S. cf. S. major, Yindirtemys grangeri, Y. xiningensis, Y. ambiguus, Eucricetodon sp., Tachyoryctoides? sp., Parasminthus asiae朿entralis, P. tangingoli, P. parvulus, Parasminthus spp., Sinosminthus sp., Heterosminthus lanzhouensis, Litodonomys huangheensis和Didymoconus berkeyi）,被称为峡沟动物群。其中8属11种与党河Taben朾uluk动物群共有。两者的时代大致相当,为晚渐新世。位于瞿家川附近的下红泥岩下部产有：Desmatolagus cf. D. gobiensis, Ordolagus sp.,Tataromys plicidens, Tsaganomys altaicus, Amphechinus cf. A. minimus和Sinolagomys kansuensis等。该动物群的面貌显得比峡沟动物群的要老,而与其下的黄砂岩中所产的南坡坪动物群较相似,其时代有可能为早渐新世晚期。如果更多的化石证明是这样,那么在兰州盆地同一时代的同一动物群可产于不同的岩层（黄砂岩和下红泥岩下部）,而代表不同时代的不同的动物群产于同一岩性地层中。早、晚渐     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

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.