橐吾属一新种

多年生草本。根稍带肉质,较细,疏被短柔毛,茎细瘦,直立,高30～60cm,连同花序密被黄褐色短柔毛夹疏的白色柔毛,基部直径3～6mm,被褐色枯叶柄纤维包围。丛生叶及茎基部叶具短柄,柄长2～4cm,有翅、基部扩大成鞘状,茎中上部叶不具柄而半抱茎;叶片倒宽卵形,卵形或长圆形,长     

中国毛莨科植物小志(九)

多年生低矮草本。根状茎圆柱形,粗约3毫米。茎高约5.5厘米,不分枝,与叶柄均密被开展的白色长和短柔毛及黄色短腺毛,在基部之上有1叶。基生叶约2,具长柄;叶片纸质,轮廓肾形,长1.7—2.3厘米,宽2.8—4.2厘米,基部心形,三裂稍超过中部,中深裂片扇状倒梯形或倒梯形,三浅裂,浅裂片顶端圆或钝,不分裂或有1枚牙齿,侧深裂片轮廓斜扇形,不等二浅裂,上面被近贴伏短柔毛,下面在平的脉上被开展短柔     

中国毛茛科植物小志(九)

多年生低矮草本。根状茎圆柱形,粗约3毫米。茎高约5.5厘米,不分枝,与叶柄均密被开展的白色长和短柔毛及黄色短腺毛,在基部之上有1叶。     

封面说明

<正>西藏杓兰(Cypripedium tibeticum King exRolfe),为兰科杓兰属的多年生草本植物。植株高15~35 cm。茎直立,无毛或上部近节处被短柔毛,基部具数枚鞘,鞘上方具2~4枚叶。叶片椭圆形、卵状椭圆形或宽椭圆形,长8~16 cm,宽3~9 cm,无毛或疏被微柔毛,边缘具细缘毛。茎顶生1花;苞片叶状;花梗和子房长2~3 cm;花大,俯     

广西鱼黄草属一新种

<正> 多年生草本。茎细长,匍匐,上部常缠绕,密被长硬毛。叶椭圆形或卵状披针形,长1.8—5厘米,宽0.8—2.5厘米,全缘,顶端锐尖或近圆形,具短尖头,基部近圆形,浅心形或阔楔形,边缘密被及两面疏被长硬毛,背面脉上毛常较密,侧脉每边3—6条,两面凸起,小脉平行横出,在叶面不显,在叶背明显突起;叶柄长3—8毫米,密被长硬毛。花序的苞叶卵形,基部截形,少为浅心形或近圆形。聚伞花序腋生,具花1—3朵,仅1花能育,花序梗长约5毫米;苞片线形,极小,长2—3毫米;花蕾狭卵形,顶端长渐尖;萼片披针形,近等     

水竹叶属一新种

<正> 多年生水生草本,高达30厘米,具须根;茎匍匐,多分枝,上升,节间1.5—7厘米,粗 1—3 毫米,具条棱,被一列多细胞短柔毛。叶鞘长 5—6 毫米,口部密被多细胞睫毛;叶全部茎生,无毛,心形,稀卵形,长 1—3 厘米,宽 0.8—2 厘米,顶端急尖或钝,基部通常浅心形,抱茎,稀圆形,边全缘,无柄。花通常2—4朵簇生于叶腋;苞片卵状矩圆形,长5—7毫米,宽3毫米,膜质;花梗挺直,长约1.4厘米,果时可达2厘米,被短柔毛,中部行有一关节;萼片绿色,卵形,无毛,长约4毫米,宽约2.5毫     

安徽银莲花属一新种

多年生草本。根状茎圆柱形,长3.4—4.7cm,直径4—7mm,节密集,节间短缩,密生纤维状须根。基生叶全都只1枚,具长柄;叶片纸质,肾状五角形,长2.7—5.5cm,宽4—9cm,叶基深心形,三全裂;中全裂片菱状倒卵形,宽     

四川竹类新分类群

秆高12-14米,直径粗8-10厘米,全秆共有40节,微作之字形曲折,先端直立,节间最长35-38厘米,一般长约30厘米,基部最短节间长约10厘长,圆筒形,绿色,无白粉,无毛,基部2-3节间幼时具黄白色细纵条纹(宽0.2-1毫米)秆壁厚1.5-2.5厘米,髓呈头垢状;箨环隆起,暗褐色,无毛,有时具箨鞘基部之残留物;秆环平;节内宽5-10毫早落,灰褐色,三角形至长三角形,长10-23厘米(约为节间氏度的1/3,基部宽20-30厘米,顶端宽8-16厘米,背面通常无毛(偶有稀疏棕黑色刺毛),纵脉纹显著,上部和两侧的小横脉略明显;算耳显著,不等大,厚纸质,略呈三角形或半圆形,约褶,具脉纹,无毛,易碎落,长召-4厘米,宽1-2厘米,边缘密生黄褐色长卜5毫米微弯曲之遂毛;榨舌略呈圆弧形,灰褐色,纸质,无毛,高1-3毫米,口部密生灰白色纤毛,捧片宽大,卵状三角形,直立,长5.5-16厘米,基部宽10-15厘米,先端渐尖,基部微作圆形收缩,背面无毛,微被白粉,纵脉纹较细而略明显,内面黄褐色至棕黑色,密生小刺毛和刺毛,纵脉纹显著隆起;秆芽圆锥形,不贴主秆,芽鳞无毛或有时具稀疏灰白色小刺毛,纵脉纹明显,边缘具纤毛,分枝低矮,通常于第1-2节即开始分枝,主枝常为3枚,全一民达3米,具15节,节间长6-32厘米,直径粗1-2.5厘米,无毛,无自粉,具有与秆捧性质相同的枝释,主秆下部之小枝不发达而缩短成软刺,小枝具叶5-11枚,叶鞘长5-6.5厘米,淡黄绿色,无毛,有光泽,上部纵脊明显,纵脉纹略可见,边缘密生灰白色纤毛;叶耳缺失,鞘口两肩无继毛,叶舌截平形,黄褐色,无毛,高不及1毫米,口部整齐,外叶舌显著,无毛,光亮,叶片披针形,革质,长12-23厘米,宽1.5-2.5厘米,正面绿色,背面淡绿色,均无毛,先端渐尖,旅部楔形或有时略呈圆形,次脉6-8对,小横脉不发育,边缘一侧具小锯齿而略粗糙,另一侧近于平滑,叶柄长1-3毫米,扁而微扭曲,无毛;花枝未见。笋期6-7月。     

云南姜属一新种

直立草本,高1—1.5m,基部具紫红色的无叶片的叶鞘。上部叶无柄,下部具极短的柄;叶片披针形或狭披针形,长15—32cm,宽5—6.5cm,顶端渐尖或尾尖,基部楔形,叶面绿色,无毛,叶背淡绿色,被稀疏的白色柔毛;基叶椭圆形,长约6.5cm,宽3.2cm,顶端短渐尖,基部近圆形,叶面深绿色,叶背紫红色;叶舌2裂,长4—7mm,     

新种漓江猕猴桃

<正> 大型落叶攀援藤本。幼枝密被淡黄褐色星状短绒毛,尤于枝顶端为甚;二至多年生的枝条毛渐脱落,最后秃净,红褐色至黑褐色,皮孔长圆形,显著;髓心白色至淡褐色,片层状。叶纸质,倒阔卵形至倒卵形或阔卵形,长4.5—12cm,宽4—12.5cm,先端短渐尖或急尖,极少截平并中间凹入,基部心形,边缘具硬质小齿,幼叶腹面被稀薄的星状短绒毛,背面密被淡白色星状短绒毛,老叶两面毛渐脱落,叶脉显著,在背面突起,侧脉6—9对;叶     

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.     

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.     

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.     

Detection of EBV and HHV6 in the Brain Tissue of Patients with Rasmussen’s Encephalitis

Rasmussen’s encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8⁺ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8⁺ T cells are involved in the pathogenesis of RE.     

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).     

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.