无前恙螨属二新种(蜱螨目:恙螨科)

本描述了采自江苏黑线姬鼠体上的无前恙螨属二新种,即长盾无前恙螨Walchia(Walchia)longiscuta Xia et Chen,sp．nov．和孟氏无前恙螨Walchia(Walchia)meni Xiaet Chen,sp．nov．。模式标本保存于复旦大学上海医学院寄生虫学教研室。     

云南省微板无前恙螨的初步研究

为探索云南省微板无前恙螨Walchia micropelta的分布规律及感染情况,2001—2015年选取云南省33个县(市)进行恙螨的现场调查,统计分析微板无前恙螨的构成比、感染率、平均多度和感染度,并比较其在不同生境、地域和海拔的感染差异。采用扩散指数、I指数、聚块指数和CA指数分析微板无前恙螨的空间分布型;用协调系数分析微板无前恙螨和葛洪无前恙螨W.koi的种间协调关系。结果显示,在22个调查点采集到微板无前恙螨4 014只,占全部恙螨的3.15%,且广泛分布于20种宿主体表;微板无前恙螨多采集于云南省南部,在低海拔地区、山区和室外生境的数量丰富;不同年龄宿主体表的微板无前恙螨的感染存在差异,成年宿主恙螨的构成比、感染率和平均多度均高于未成年且有统计学意义(P 0.05);微板无前恙螨与葛洪无前恙螨在黄胸鼠Rattus tanezumi体表存在正协调关系(V=0.12,P 0.05)。由此可见,云南省微板无前恙螨分布广泛,但其宿主特异性低,多聚集分布于啮齿动物上。地域、海拔、宿主的种类和年龄等因素对微板无前恙螨的感染有影响。     

广东省华溪恙螨属一新种(真螨目:恙螨科)

本文报道采自广东省黑石顶自然保护区华溪恙螨属一个新种。 封华溪恙螨Walehia fenga新种(图1—7) 鉴别特征 盾板短宽,PW/SD>0.60;前侧毛与后侧毛间距大于后侧毛水平线至盾后角的垂直距离(PP);感器短小,22×13+7;盾板毛分枝明显;盾板刻点粗疏;背毛排列4.8……。 本新种与太平洋华溪恙螨Walchia pacifica Chen et Hsu,1955极相似,但AP>pp而不是相反或略相等,盾扳短宽(PW/SD=0.57—0.71,平均0.63),感器膨大部分较长;腹毛数目较少。     

纤恙螨属恙螨一新种：蜱螨亚纲：恙螨科

从采自新疆博乐县阿拉山口(海拔290 m)室内灰仓鼠伏龙芝亚种 Cricetulus migratorius caesius耳壳内的一批纤恙螨标本鉴定中发现中国新记录亚属——爱柯纤恙螨亚属 Ericotrombidium中的一个新种,定名为博乐纤恙螨 Leptotrombidium (E.) bolei sp.nov.,它与美丽纤恙螨L.(E.)pulchrum(Sosnina,1950)及索氏纤恙螨L.(E.)sokolovi Kudryshova,1984比较近似,但本新种IP及盾板量度除 AM外均较大,PW-SB≥PL,可与前者区别;IP较小,平均787,幅度763—821,DS较少,排列规则:2+8.6.6.4.2=28,可与后者区别。     

辽宁省恙螨生态地理分布

辽宁省已知恙螨25种,分属于2科3亚科10属。本文依据四个不同地理景观区内恙螨的优势种、常见种和罕见种,对其生态地理分布作了讨论。(1)辽东山地及半岛丘陵区：有恙螨22种。其中东方纤恙螨为优势种;姬鼠纤恙螨、仓纤恙螨、林姬纤恙螨、皆貌纤恙螨、塔米新恙螨、鸡新棒恙螨等为罕见种.(2)辽河平原区：有恙螨8种。优势种为须纤恙螨;辽姬纤恙螨为罕见种。(3)辽西低山丘陵区：有恙螨8种。其中高丽新恙螨为优势种;凹邃合轮恙螨、膜嗜翼手恙螨等为罕见种。(4)黄土丘陵台地干草原区：有恙螨2种,均为常见种,其中脆弱无前恙螨数量较多。     

宁夏一新属恙螨(蜱螨亚纲:恙螨科)

1986年从宁夏回族自治区来到一种稀有的恙螨幼虫,系恙螨科(Trombiculidae)恙螨亚科(Trombiculinae)恙螨族(Trombiculini)中的一新属新种。 柳氏恙螨属Liuella新属 恙螨族幼虫鬚肢毛式fp=B-B-BNB/4B.S。眼2对较大。盾板宽盾形,无前侧肩,后缘中央具明显的乳状突起。后侧毛在盾板的外侧。感毛近基部具小棘。螯肢爪末端具三角冠。须肢爪3分叉。足基节毛fCx=1/2/1。胸毛式kSt=2/2/9,此外在足Ⅱ和     

同鞭恙螨亚属的修订和一新种恙螨的记述：蜱螨亚纲：恙螨科

本文对同鞭恙螨亚属Synlorillatum Zhao,1985的亚属征作了补充和修订,并探讨了通什长鞭恙螨Lorillatum(S.)tungshihensis Hsu & Chen,1964的分类地位问题。此外,记述了采自鼠耳蝠Myotis sp.的一个恙螨新种——鞭感长鞭恙螨Lorillatum(Synlorillatum)flagellasensilla sp.nov.     

江西省纤恙螨属二新种（蜱螨亚纲：恙螨科）

本文报道采自江西省武功山和庐山地区的纤恙螨属二新种:武功纤恙螨Lepfotrombidium (L.)wugongensis和庐山纤恙螨Leptotrombidium(L.)lushaneusis,并对该新种的形态特征作了详细描述,与近似种湖北纤恙螨 Leptatrombidium(L.)hupeca(Ma et Hsu)1965和曲靖纤恙螨Leptotrombidium(L.)quiingensis(Yu et al.)1981进行了分析比较。     

纤恙螨属一新种：真螨目：恙螨科

本文报道1983年采自吉林省和龙县棕背(鼠平) Clethrionomys rufocanus 体上的一种新恙螨,棕(鼠平)纤恙螨 Leptotrombidium rufoconum sp.nov,模式标本分别存放福建医学院寄生虫学教研室和沈阳军区后勤部军事医学研究所。     

恙螨一新属新种(蜱螨目:恙螨科)

1985年在湖北省采到一种恙螨,经研究鉴定为一新属新种,现记述如下,文中测量单位为微米。 徐氏恙螨属Hsuella新属 鉴别特征:恙螨亚科中盾板近长方形,宽大于长,板后缘向后略突。板上除1对感毛外尚有7根毛,即1根前中毛,1对前侧毛和2对后侧毛。螯鞘毛具密分枝(Ga=B),鬚跗毛式汀fT=7B。 本新属为纪念我国著名螨类学家徐荫祺教授而命名。     

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.