使用ELISA技术检测中草药抗HBeAg的实验研究

使用ＥＬＩＳＡ技术对２５０种中草药水提取物进行抗ＨＢｅＡｇ的实验研究,共筛出有效药物７种（占总数的２．８％）。若按５种不同剂量（０．３、０．６、１．２、２．５、５．０ｍｇ／１００μｌ）的药物、２种不同浓度的ＨＢｅＡｇ（１０．９２、１４．２６Ｐ／Ｎ值）与３种不同接触时间（立即、１ｈ、２ｈ）的１０项Ｐ／Ｎ值均数来综合评价药效指数时,７种有效药物的次序为丹参（１．５５）、皂夹（２．３４）、黄莲（２．８１     

芋的组织培养

１植物名称芋（Ｃｏｌｏｃａｓｉａｅｓｃｕｌｅｎｔａ）品种江汉芋（多子芋类型）。２材料类别茎尖及微芽。３培养条件分化培养基：（１）ＭＳ＋６－ＢＡ３．０～５．０ｍｇ·Ｌ－１（单位下同）＋ＮＡＡ０．５;（２）ＭＳ＋６．ＢＡ１．０～２．０＋ＮＡＡ０．５。诱导生根培养基：（３）ＭＳ＋６－ＢＡ１．０～２．０＋ＮＡＡ０．１。培养基（１）、（２）中另加蔗糖３０ｇ·Ｌ－１,培养基（３）中加蔗糖１０ｇ·Ｌ１,琼脂６～７ｇ·Ｌ－１,ｐＨ５．８～６．０,１２１℃高温高压灭菌１５ｍｉｎ左右。光照度１５５～２０００ｌｘ,光…     

香石竹的叶片培养及植株再生

１植物名称香石竹（Ｄｉａｎｔｈｕｓｃａｒｙｏｐｈｙ－ｌｌｕｓ）,别名康乃馨。２材料类别无菌苗叶片。３培养条件以ＭＳ为基本培养基。分化培养基附加：（１）６－ＢＡ１．０ｍｐ·Ｌ－１（单位下同）＋ＮＡＡ０．３;（２）６－ＢＡ１．０＋ＮＡＡ０．１;（３）６－ＢＡ１．０＋ＮＡＡ０．０５。增殖培养基附加６－ＢＡ０．５＋ＮＡＡ０．１。分化和增殖培养基均加蔗糖３％、琼脂０．７％,ｐＨ５．８。生根培养基为１／２ＭＳ附加ＮＡＡ０．１,蔗糖２％,琼脂０．６％,ｐＨ５．８。培养温度为（２５±１）℃,光照１２ｈ·ｄ－１,…     

不同剂量乙肝疫苗阻断乙型肝炎病毒母婴传播的远期效果观察

本文对出生后接种不同剂量乙肝血源疫苗的２７２名婴儿进行了３－５年的效果随访观察。结果表明,接种３、４、５年后,抗－ＨＢｓ阳性率仍分别保持在９０．５％、８２．３％和７３．２％,ＨＢｓＡｇ阳性率分别为２．８％、３．１％和４．２％。３年后抗－ＨＢｓ阳性率逐年下降,Ｐ／Ｎ值＞５０者以接种后３年为多,＜５０者以５年为多,３年后也呈下降趋势。随访结果说明,接种１０μｇ×４、５μｇ×４及２．５μｇ×４剂量的乙肝疫苗具有阻断母婴乙肝病毒传播的效果。鉴于Ｐ／Ｎ值及抗－ＨＢｓ阳性率在接种后３年开始下降,建议接种后３年应进行一次加强接种。     

蚯蚓体内一种纤溶酶原激活剂(e-PA)对ATEE的降解

赤子爱胜蚓（Ｅｉｓｅｎｉａｆｅｔｉｄａ）体内的一种纤溶酶原激活剂（ｅ－ＰＡ）能够降解人工合成底物Ｎ－乙酰－Ｌ－酪氨酸乙酯（ＡＴＥＥ）,该降解反应的最适ｐＨ为８．５,而且在０．２ｍｏｌ／ＬＮａ２ＨＰＯ４中的活性要强于在０．０５ｍｏｌ／ＬＴｒｉｓ－ＨＣｌ（ｐＨ８．５）中．分别测定了ｅ－ＰＡ的大小亚基及全酶在０．２ｍｏｌ／ＬＮａ２ＨＰＯ４与０．０５ｍｏｌ／ＬＴｒｉｓ－ＨＣｌ（ｐＨ８．５）两种体系中的Ｋｍ和Ｋｃａｔ．结果表明,在０．２ｍｏｌ／ＬＮａ２ＨＰＯ４中,全酶的ＡＴＥＥ活性远远高于大小亚基单独的ＡＴＥＥ活性,而在０．０５ｍｏｌ／ＬＴｒｉｓ－ＨＣｌ（ｐＨ８．５）中则没有这种现象．从蛋白质结构的角度对这一结果作了解释．用不同抑制剂和ｅ－ＰＡ作用,结果表明,ｐｅｐｓｔａｔｉｎ,Ｅ－６４和ＥＤＴＡ对ｅ－ＰＡ的ＡＴＥＥ活性都有不同程度的抑制,这一点与ｅ－ＰＡ的ＢＡＥＥ活性不同．     

宫粉郁金的组织培养和快速繁殖

１植物名称宫粉郁金（Ｃｕｒｃｕｍａ　ｋｗａｎｇｓｉｅｎｓｉｓ）。２材料类别　块茎萌动芽。３培养条件　萌动芽生长培养基：（１）ＭＳ＋６－ＢＡ１ｍｇ·Ｌ－１（单位下同）＋ＮＡＡ０．２。不定芽增殖与愈伤组织诱导培养基：（２）ＭＳ＋６－ＢＡ１０＋ＫＴ５;（３）ＭＳ＋６．ＢＡ１０;（４）ＭＳ＋６－ＢＡ５＋ＫＴ２．５;（５）ＭＳ＋６－ＢＡ５;（６）ＭＳ＋６－ＢＡ２＋ＫＴ１。生根培养基：（７）ＭＳ＋ＮＡＡ０．５;（８）ＭＳ＋６－ＢＡ０．５＋ＮＡＡ０．５;（９）ＭＳ。以上培养基均加０．７％琼脂,３％蔗糖,ｐＨ５…     

深红蔓绿绒的组织培养与快速繁殖

１　植物名称　深红蔓绿绒（Ｐｈｉｌｏｄｅｎｄｒｏｎｍａｎｄａｉａｎｕｍ“ＲｏｙａｌＱｕｅｅｎ”）。２　材料类别　顶芽、侧芽。３　培养条件　以ＭＳ为基本培养基。（１）芽体启动培养基：ＭＳ＋６ＢＡ２ｍｇ·Ｌ－１（单位下同）＋ＮＡＡ０．０１;（２）不定芽增殖培养基：ＭＳ＋６ＢＡ３～４＋ＮＡＡ０．１;（３）生根培养基：１／２ＭＳ＋６ＢＡ０．５＋ＩＢＡ２。以上培养基均加琼脂７．５ｇ·Ｌ－１,ｐＨ值为５．８,培养室温度（２６±２）℃,光照度１０００ｌｘ,每日光照时间１２ｈ。培养基（１）与（２）中蔗糖用…     

玉香梨的组织培养与快速繁殖

１植物名称沙梨品种玉香梨（Ｐｙｒｕｓｐｙｒｉｆｏｌｉａ　ｃｖ．　ｙｕｘｉａｎｇ）。２材料类别侧芽。３培养条件（１）丛芽诱导培养基：１／２ＭＳ大量元素＋ＭＳ微量元素＋铁盐＋有机成分＋６－ＢＡ２ｍｇ·Ｌ－１（单位下同）＋ＮＡＡ０．２＋ＧＡ３２＋３％蔗糖＋０．８％琼脂,固体培养;（２）增殖培养基：１／２ＭＳ＋ＢＡ１．５＋ＮＡＡ０．２＋ＧＡ３１＋３％蔗糖＋０．８％琼脂,固体培养;（３）生根培养基：１／２ＭＳ＋ＩＢＡ１０＋１．５％蔗糖＋０．６％琼脂,固体培养８ｄ后转入不含任何激素的同类培养基中的二步生根法…     

黑曲霉产木聚糖酶发酵条件的研究

正交设计试验结果表明,黑曲霉（Ａｓｐｅｒｇｉｌｌｕｓ ｎｉｇｅｒ ｍ１２）产木聚糖酶活力达７６．６０ｕ／ｍｌ,合适的产酶发酵条件如下,培养基（ｇ／Ｌ）：麸皮４０,尿素６．６７,ＫＨ２ＰＯ４ １．０,ＭｇＳＯ４．７Ｈ２Ｏ０．５,ＮａＣｌ０．３,Ｔｗｅｅｎ－８０ ３．０,ＣａＣＯ３ ２．０,２８℃,１２０ｒ／ｍｉｎ水浴振荡培养５．５ｄ。     

紫菀花序芽培养及植株再生

１植物名称紫菀（Ａｓｔｅｒｔａｔａｒｉｃｕｓ）。２材料类别花序芽。３培养条件愈伤组织、不定芽诱导及增殖培养基：（１）ＭＳ＋６－ＢＡ０．５～２．０ｍｇ·Ｌ－１（单位下同）;生根培养基：（２）ＭＳ＋ＮＡＡ０．５～２．０＋６－ＢＡ０．２,（３）１／２ＭＳ（大量元素减半）＋ＮＡＡ０．５～２．０＋６－ＢＡ０．２。上述培养基均加０．８％琼脂和３％蔗糖,高温高压灭菌前ｐＨ值调至５．８。培养温度为（２３１２）℃,每天光照１２ｈ,光照度为１５００～２０００ｌｘ４生长与分化情况４．１愈伤组织及不定芽的诱导剪取长约０…     

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).