雷公青冈和滇南青冈学名订正

分布于华南的雷公青冈Quercus hui Chun和分布于云南及广西的滇南青冈Q.austroglauca(Y.T.Chang)Y.T.Chang长期被认为是我国特有植物,实则分别为越南北部分布的Q.auricoma A.Camus和云南东南部分布的龙迈青冈Q.lungmaiensis(Hu)C.C.Huang & ...     

海南岛青冈属(壳斗科)一新种

描述海南岛昌化岭青冈一新种。     

国产青冈属植物的两个新组合

对东方青冈Quercus dongfangensis进行了重新组合,并对乌壳青冈Quercus fuliginosa进行了新组合。     

中国东部亚热带青冈种群叶片的生态解剖

运用生态解剖学的方法对我国亚热带东部分布的１０个青冈种群叶片的解剖特征进行了比较分析,结果如下：①青冈叶片结构在种群间存在着广泛的差异,这种差异是青冈适应不同环境条件的结构基础。青冈叶片各部分结构特征在种群间的变化不晃同步的,变异系数（ＣＶ）在６．０％～２０．５％之间;变异幅度最大的是栅栏组织和上角质膜厚度,最小的是下表皮厚度。②相关分析表明,温度和降雨是影响青冈叶片地理变异的主导因子,其中温度、     

中国青冈的地理分布与气候的关系

在广泛收集青冈（Ｃｙｃｌｏｇｂａｌａｎｏｐｓｉｓｇｌａｕｃａ（Ｔｕｎｂ．）Ｏｅｒｓｔ．）地理分布资料的基础上,利用目前国际上较流行的研究植被与气候相互关系的指标和方法,包括Ｋｉｒａ的水热指标、Ｐｅｎｍａｎ的公式、Ｔｈｏｒｎｔｈｗａｉｔｅ的指标和气候分类、Ｈｏｌｄｒｉｄｇｅ的生命地带分类系统指标,以及年平均气温、１月均温、７月均温、极端最高气温、极端最低气温≥１０℃积温和年降水量,研究了青冈在中国的     

青冈亚属植物的地理分布

对壳斗科青冈亚属（Quercus subg.Cyclobalanopsis)植物分布区内各地区的分布作了分析和统计。通过分析,认为中国南部、西南部和中南半岛北部,即印度支那植物地区,是青冈亚属植物地理分布的分布区中心。基于其形态、现代分布和地史资料,马来西亚地区分布有许多性状较原始的类群,是青冈亚属原始类的保存中心。青冈亚属植物中有许多地区 特有种,它们的分布区很狭窄,集中分布在加里曼丹、台湾、海南和云南东部部,其产生的原因主要是地理隔离,如海峡、高山等,以及气候和地史的复杂性。青冈亚属植物还存在许多替代现象,如青冈（Q.schottkyana）、赤皮青冈（Ｑ.gilva)和黄毛青冈（Ｑ.delavayi)`、云山青冈（Q.sessifolia)和窄叶青冈（Ｑ.augustinii)为中国－日本分布式和中国－喜马拉雅分布式之间替代。     

青冈种群的动态调节初探

本文通过调查统计和实验,对青冈种群动态进行了初步研究,包括种子库动态、种子萌发、无性繁殖以及密度调节等。研究表明,青冈种子量较大,但只有少数能发育成幼苗;有性繁殖和无性的克隆生长相互配合达到种群较高的繁殖效率;种群内个体的自疏定律说明,较成熟(40年左右)的青冈种群的增长速度已减慢。     

中国东部亚热带青冈果实形态变异的研究

青冈为我国亚热带地我广泛分布,并具有较强耐寒和耐瘠薄能力的少数几个常绿树种之一,以果实长度,宽度和体积作为果实大小的指标,宽／长作为果实形状的指标,对采自东部亚热带的１０个青冈和群果实形态进行了比较分析,结果如下：（１）青冈果实的大小和形状在种群间,种群内均存在着显著差异,变异幅度最大的是果实的体积（种群间的变异幅度ＣＶ１为５７．１％,种群间平均单粒果实体积的最大差异为３．５倍）其次为宽度（２１．     

弄拉典型峰丛岩溶区青冈栎叶片形态特征及对环境的适应

选取广西弄拉典型峰丛洼地生态系统中不同地貌类型的青冈栎 (Cyclobalanopsisglauca)叶片进行形态解剖特征比较分析 ,结果表明 :( 1 )峰丛洼地生态系统中不同地貌青冈栎叶片形态解剖特征差异显著。山顶青冈栎叶片部分表皮结构 (角质膜、表皮毛、表皮细胞、气孔 )趋向旱化。山顶青冈栎下表皮毛比山腰青冈栎的浓密且长。两者叶片的厚度和宽度、上表皮细胞个数、气孔指数、下表皮厚度、栅栏组织厚度、海绵组织厚度存在着显著性差异 ;位于山顶的青冈栎受到水分的胁迫 ,在形态解剖上呈现出中生偏旱的结构。 ( 2 )青冈栎的各种形态解剖指标说明在岩溶区青冈栎的抗旱性主要是通过抵御干旱来适应水分的胁迫 ,并主要取决于减少蒸腾失水和维持水分吸收能力两个方面     

滇青冈幼苗的光合和生长对不同生长光强的适应

研究了3种光强(全日照的80%、20%和2%)下生长的滇青冈幼苗的光合-光强响应和生长状况。结果表明:3种光强生境滇青冈幼苗光饱和点和最大净光合速率没有显著差异,20%和2%生长光强下光补偿点显著低于80%生长光强。3种光强生境幼苗的光合饱和点在400~450μmol·m-2·s-1左右,光补偿点也很低(6~10μmol·m-2·s-1),表现出阴生植物的特征。但滇青冈幼苗较强的耐荫能力,是以牺牲生长为代价的。在2%的弱光生境中滇青冈幼苗比叶重显著降低,单位面积和单位干重叶绿素含量均显著增多,具有利用较强辐射的潜力,一旦林窗出现就可以利用增加的辐射提高光合速率,及时进入快速高生长。     

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.