荣莉根化学成分的研究（Ⅱ）

为分离鉴定茉莉根化学成分,用乙醇提取,经硅胶、大孔树脂和ODS柱层析分离,通过IR,NMR及MS波谱分析法确定结构。分得4个化合物,分别鉴定为molihuaside（1）、sambacosideA（2）、β-谷甾醇（3）和豆甾醇（4）。以上化合物均为首次从茉莉根中分离得到。     

蕺叶秋海棠化学成分的研究

从蕺叶秋海棠(Begoma limprichtu Irmsh)全草中分得5个化合物,经理化性质和波谱分析,分别鉴定为:豆甾醇-3-O-β-D-葡萄糖甙-6’-十六烷酸酯(1),豆甾醇3-O-β-D-吡喃葡萄糖甙(2),芦丁(3),豆甾醇(4),胡萝卜甙(5)。     

印楝愈伤组织的化学成分

从印楝（Ａｚａｄｉｒａｃｈｔａ ｉｎｄｉｃａ Ａ．Ｊｕｓｓ）的愈伤组织中,共分离鉴定出５个化合物,经理化性质和波谱分析分别确定为：柳杉酚⑴,豆甾醇⑵,软酯酸－１－甘油酯⑶,豆甾醇－３－Ｏ－β－Ｄ－吡喃葡萄糖甙⑷,豆甾醇－３－Ｏ－β－Ｄ－吡喃葡萄糖甙－６’－十六烷酸酯⑸。     

九头狮子草化学成分的研究

从九头狮子草种分离得到9个化合物,分别鉴定为:正十八烷(1)、cholest-5-en-3β-oxyl hexadecanoate(2)、硬脂酸(3)、软脂酸(4)、三十三烷醇(5)、β-谷甾醇(6)β-谷甾醇和豆甾醇的混合物(7)、β-谷甾醇和豆甾醇的葡萄糖苷(8)、尿囊素(9).其中化合物1～5系首次从本植物中分得.     

飞机草中的化学成分

从飞机草（Eupatorium odoratum Linn)中分离得7个化合物,经光谱分析鉴定为：山萘酚－4'-甲基醚（1）,槲皮黄素7,4'－二甲基醚（2）,刺槐素（3）,柑桔素－4'-甲基醚（4）,豆甾醇（5）,β-谷甾醇（6）及β－胡萝卜甙（7）。     

川明参根部的化学成分

从我国特有的单种属药用植物川明参（Ｃｈｕａｎｍｉｎｓｈｅｎ ｖｉｏｌａｃｅｕｍ　 Ｓｈｅｈ ｅｔ Ｓｈａｎ）中分离出８个晶体,经理化性质和波谱分析分别鉴定为：５,８－二甲氧基补骨脂素（晶Ⅰ）,５－异戊烯基－８甲氧基补骨脂素（晶Ⅱ）, ｐｒｏｃｙａｎｉｄｉｎ Ａ－２（晶Ⅲ）,槲皮素－３－Ｏ－葡萄糖醛酸甙（晶Ⅳ）,芦丁（晶Ⅴ）,豆甾醇（晶Ⅵ）,豆甾醇－葡萄糖甙（晶Ⅶ）及棕榈酸,硬脂酸的混合物（晶Ⅷ）。上述化合物均为首次从该植物中分离得到。     

福建金线莲的化学成分研究Ⅲ

从福建金线莲(Anoectochilus roxburghii)乙醇提取物的己烷萃取部分分得3个化合物和-甾体混合物,三个化合物结构分别鉴定为Sorghumol(1),木栓酮(2)和棕榈酸(3),甾体混合物经EI-MS、ESI-MS／MS技术确定含有24-异丙烯基胆甾醇、开唇兰甾醇、β-谷甾醇、豆甾醇和菜油甾醇。所有化合物均为该植物首次报道,其中化合物1为首次从兰科植物中分得,并首次对其光谱数据进行了详细的分析,化合物2为从该属植物中首次分得。     

西昌万寿菊花中化学成分的研究

从万寿菊（Tagetes ereata L．）花中分得8个已知化合物,分别为丁香酸（Syringic acid,1）,3,4二羟基苯甲酸（3,4-dihydroxybenzonic acid,2）,β-香树脂醇（β-amyrin,3）,槲皮万寿菊素（Quercetagetin,4）,Quercetagetin 7-methyl（5）,β-谷甾醇（β-sitosterol,6）,豆甾醇（stigmasterol,7）,正三十四烷（Tetratriacontane,8）。应用光谱法鉴定了所有化合物的结构。     

溪黄草的化学成分研究(Ⅱ)

从中药溪黄草〖Ｒａｂｄｏｓｉｎ ｓｒｒａ（Ｍａｘｉｍ．）Ｈａｒａ〗中又得到一和睦无定形固体Ａ和一种无色针状晶体Ｂ,Ａ经不谱数据分析鉴定为正十六酸（１）,Ｂ经ＧＣ－ＭＳ分析确定为３种甾醇,２４－甲基胆甾醇（Ⅱ）,豆甾醇（Ⅲ）,β－谷甾醇（Ⅳ）,其中化合物Ⅰ、Ⅱ、Ⅲ系首次从溪黄草〖Ｒａｂｄｏｓｉａ ｓｅｒｒａ（Ｍａｘｉｍ（Ｈａｒａ〗中分离得到。     

倒心盾翅藤的化学成分研究

从药用植物倒心盾翅藤（Aspidopterys obcordata Hemsl.）中首次分离得到５个化合物,通过波谱分析分别鉴定为木栓酮（１）、无羁萜－３β－醇（２）、二二烷酸甲酯（３）、１０－二九烷醇（４）、豆甾醇（５）和daphnetin-8-glucopyranoside(6)。     

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.