塔里木盆地草2井东河砂岩段孢子组合的时代

塔里木盆地北部草２井东河砂岩段５９９１－６０２２ｍ井段产有丰富的孢子化石,有关该孢子组合的时代长期存有争论。本文剖析了针对这一孢子组合的不同时代观点,依据国内外地质分布限于晚泥盆世的Ａｎｃｙｒｏｓｐｏｒａｓｐｐ．,Ｒｅｔｉｓｐｏｒａｃａｓｉｃｕｌａ（Ｈｉｇｇｓ）ＨｉｇｇｓｅｔＲｕｓｓｅｌ和ＡｐｉｃｕｌｉｒｅｔｕｓｉｓｐｏｒａｒａｒｉｓｉｍａＷｅｎｅｔＬｕ等重要孢子在当前组合的出现,以及该组合与塔西南晚泥盆世孢子组合可以对比,论证了东河砂岩孢子组合的时代应为晚泥盆世。     

新疆南部莎车奇自拉夫组晚泥盆世孢子组合及孢粉相研究

新疆南部莎车县奇自拉夫组产孢子２４属５６种（含１０新种），可分为两个孢子组合带：即：Ｌｅｉｏｔｒｉｌｅｔｅｓ ｍｉｃｒｏｔｈｅｌｉｓ－Ｐｕｎｃｔａｔｉｓｐｏｒｉｔｅ ｉｒｒａｓｕｓ（ＭＩ）带和Ａｐｉｃｕｌｉｒｅｔｕｓｓｉｓｐｏｒａ ｒａｓｉｓｓｉｍａ－Ｒｅｔｉｓｐｏｒａ ｌｅｐｉｄｏｐｈｙｔａ（ＲＬ）带。ＲＬ带又进一步细分为两个亚带，即下部的Ｒｅｔｉｓｐｏｒａ ｌｅｐｉｄｏｐｈｙｔａ－Ａｎｃｙｒｏ     

湘中锡矿山邵东组和孟公坳组孢子组合──兼论泥盆－石炭系界线

湘中锡矿山邵东组和孟公坳组共产小孢子４５属８３种（含１０个新种,３个新联合）,可划分为４个孢子组合,即：Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ－Ａｐｉｃｕｌｉｒｅｔｕｓｉｓｐｏｒａｆｒｕｃｔｉｃｏｓａ（ＬＦ）组合,Ｒｕｇｏｓｐｏｒａｃｆ．ｆｌｅｘｕｏｓａ－Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ（ＦＬ）组合,ＬｏｐｈｏｚｏｎｏｔｒｉＩｅｔｅｓｅｘｃｉｓｕｓ－Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ（ＥＬ）组合和Ｃｒａｓｓｉｓｐｏｒａｃｆ．ｋｏｓａｎｋｅｉ－Ｌｙｃｏｓｐｏｒａｄｅｎｔｉｃｕｌａｔａ（ＫＤ）组合。根据孢子组合的特征,泥盆－石炭系界线置于ＥＬ与ＫＤ组合之间,即相当于孟公坳组中下部与上部之间。     

湘中锡矿山邵东组和孟公坳组孢子组合——兼论泥盆—石炭系界线

湘中锡矿山邵东组和孟公坳组共产小孢子４５属８３种（含１０个新种,３个新联合）可划分为４个孢子组合,即：Ｒｅｔｓｉｐｏｒａｌｅｐｉｄｏｐｈｙｔａ－Ａｐｉｃｕｌｉｒｅｔｕｓｉｓｐｏｒａｆｒｕｃｔｉｃｏｓａ（ＬＦ）组合,Ｒｕｇｏｓｐｏｒａｃｆ．ｆｌｅｘｕｏｓａ－Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ（ＦＬ）组合,Ｌｏｐｈｏｚｏｎｏｔｒｉｌｅｔｅｓｅｘｃｉｓｕｓ－Ｒｅｔｉｓｐｏｒａｌｅｐｉｄｏｐｈｙｔａ     

宁夏中卫晚石炭世维斯发期孢粉组合

研究了宁夏中卫下河沿上石炭统羊虎沟组孢子花粉化石５５ 属９８ 种,建立了两个孢粉组合带,即Ｌａｅｖｉｇａｔｏｓｐｏｒｉｔｅｓ ｍ ｅｄｉｕｓ－Ｃｙｃｌｏｇｒａｎｉｓｐｏｒｉｔｅｓ ａｕｒｅｕｓ （ＭＡ）带和Ｔｏｒｉｓｐｏｒａ ｓｅｃｕｒｉｓ－Ｐｕｎｃ－ｔａｔｉｓｐｏｒｉｔｅｓｈｉａｎｓ（ＳＨ）带,其地质时代分别相当于维斯发Ａ－Ｂ期和维斯发Ｃ－Ｄ期．根据孢粉植物群特征,结合古地磁证据,认为中卫维斯发期为温暖潮湿的热带－亚热带气候     

鹤冈盆地石头河子组孢子花粉

本文是对鹤冈盆地中生代主要含煤地层石头河子组孢粉化石的首次报道与研究,共记述孢子花粉２６属４６种,经描述１２属２０种。文中从所发现的海金沙科孢子Ｃｉｃａｔｒｉｃｏｓｉｓｐｏｒｉｔｅｓ１１种,Ｃｏｎ－ｃａｖｉｓｓｉｍｉｓｐｏｒｉｔｅｓ１种,Ｐｉｌｏｓｉｓｐｏｒｉｔｅｓ１种,凤尾蕨科孢子Ｐｔｅｒｉｓｉｓｐｏｒｉｔｅｓ１种,石松科孢子Ｌｙｃｏｐｏｄｉ－ｕｍｓｐｏｒｉｔｅｓ１种,蚌壳蕨科孢子Ｃｉｂｏｔｉｕｍｓｐｏｒａ１种,桫椤科孢子Ｃｙａｔｈｉｄｉｔｅｓ２种以及相当数量的松柏目双囊花粉,植物亲缘关系不明的特征性花粉Ｊｉａｏｈｅｐｏｌｌｉｓ１种等,论证了石头河子组地质时代应属早白垩世晚贝里阿斯期－巴列姆期。石头河子组地质时代长期被归为侏罗纪,这一孢粉组合的研究,无疑对正确确定这一含煤地层的时代有着较重要的意义。     

南京龙潭地区五通组孢子组合及其地质时代

南京龙潭地区五通组共产小孢子５３属１３６种（含１２新种）,可划分４个孢子组合,即Ａｎｅｕｒｏｓｐｏｒａａｓｔｈｅｎｏｌａｂｒａｔａ－Ｒａｄｉｉｚｏｎａｔｅｓｌｏｎｇｔａｎｅｎｓｉｓ（ＡＬ）组合,Ｒｅｔｕｓｏｔｒｉｌｅｔｅｓ－Ｃｙｍｂｏｓｐｏｒｉｔｅｓ（ＲＣ）组合,Ｋｎｏｘｉｓｐｏｒｉｔｅｓ－Ｄｅｎｓｏｓｐｏｒｉｔｅｓ（ＫＤ）组合与Ｌｅｉｏｔｒｉｌｅｔｅｓｃｒａｓｓｕｓ－Ｌａｅｖｉｇａｔｏｓｐｏｒｉｔｅｓｖｕｌｇａｒｉｓ（ＣＶ）组合。详细分析某些已知种的垂直分布与组合对比表明：龙潭五通组除包含晚泥盆世沉积外,还包含部分早石炭世的沉积,泥盆－石炭系界线置于ＲＣ与ＫＤ组合之间,即擂鼓台段下一中部与中一上部之间较适合。此结论与相关的植物与鱼化石的时代基本一致。     

海南岛东部近海新第三纪孢粉植物群

根据ＢＤ２３－１－１井与孢子花粉共生的海相浮游有孔虫和钙质超微化石,论述了中国海南岛东部近海新第三纪各个时期的孢粉植物群特征。建立了４个孢粉组合,它们是：１．Ｑｕｅｒｃｏｉｄｉｔｅｓ－Ｃｕｐｕｌｉｆｅｒｏｉｐｏｌｅｎｉｔｅｓ－Ｆｌｏｒｓｈｕｅｔｚｉａ－Ｄｉｃｏｌｐｏｐｏｌｉｓ组合（早中新世晚期）;２．Ｄｉｃｏｌｐｏｐｏｌｉｓ－Ｅｘｔｒａ－ｐｕｎｃｔａｔｏｓｐｏｒｉｔｅｓ－Ｔａｘｏｄｉａｃｅａｅｐｏｌｅｎｉｔｅｓ组合（中中新世早期）;３．Ａｂｉｅｔｉｎｅａｅｐｏｌｅｎｉｔｅｓ－Ｐｏｌｙｐｏｄｉ－ａｃｅａｅｓｐｏｒｉｔｅｓ－Ｌｉｑｕｉｄａｍｂａｒｐｏｌｅｎｉｔｅｓ组合（中中新世晚期至晚中新世）;４．Ａｂｉｅｔｉｎｅａｅｐｏｌｅｎｉｔｅｓ－Ｐｅｒｓｉｃａｒｉｏｉｐｏｌｉｓ组合（晚中新世晚期至早上新世）。孢粉植物群反映了海南岛东部近海新第三纪的气候基本上一直比较温暖湿润,并且逐渐降温的历程。     

塔里木盆地北缘侏罗纪孢粉组合

本文系统地研究了塔里木盆地北缘侏罗纪的孢子花粉。共发现孢粉化石５２属９０种,以及藻类化石２属２种。建立侏罗纪的孢粉组合序列如下：（１）Ｄｉｓａｃｃｉａｔｒｉｌｅｔｉ－Ｃｙａｔｈｉｄｉｔｅｓ组合（早侏罗世早期阿合组）,（２）Ｃｙａｔｈｉｄｉｔｅｓ－Ｃｉｂｏｔｉｕｍｓｐｏｒａ－Ｄｉｓａｃｃｉａｔｒｉｌｅｔｉ组合（早侏罗世晚期阳霞组）,（３）Ｃｙａｔｈｉｄｉｔｅｓ－Ｎｅｏｒａｉｓｔｒｉｃｋｉａ－Ｄｉｓａｃｃｉａｔｒｉｌｅｔｉ组合（中侏罗世早期克孜勒努尔组）,（４）Ｃｙａｔｈｉｄｉｔｅｓ－Ｃｌａｓｏｐｏｌｉｓ组合（中侏罗世晚期恰克马克组）。根据孢粉组合特征讨论了地质时代,同时探讨了古植被和古气候的意义。     

植物体细胞胚发生的分子基础①

ＭｏｌｅｃｕｌａｒＦｏｕｎｄａｔｉｏｎｉｎＰｌａｎｔＳｏｍａｔｉｃＥｍｂｒｙｏｇｅｎｅｓｉｓＸＩＮＧＧｅｎｇ－ＳｈｅｎｇＣＵＩＫａｉ－ＲｏｎｇＳＨＡＮＬｕｎＷＡＮＧＹａ－Ｆｕ（ＴｈｅＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＡｒｉｄＡｇｒｏｅｃｏｌｏｇ...     

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.     

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     

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.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.