气相色谱法测定人白蛋白制品中辛酸钠含量

本文报导用气相色谱法测定人白蛋白制品中辛酸钠含量。样品用正庚酸作内标,经酸化、氯仿抽提、浓缩后,通过ＨＰ－ＩＮＮＯＷａｘ柱,以氢火焰检测器测定。本法色谱峰形好,平均回收率及变异系数分别为９８．５４％、１．３９％。测定线性范围在１０７μｇ／０．２５ｍｌ～７２０μｇ／０．２５ｍｌ。最小检测限为７．４１０μｇ。实验操作简便,样品及溶剂用量少,可作为人白蛋白制品中辛酸钠含量的检测方法。     

小鼠腺病毒单克隆抗体的研制及初步应用

应用杂交瘤技术获得４株分泌抗小鼠腺病毒（ＭｕｒｉｎｅＡｄｅｎｏｖｉｒｕｓＭＡｄ）单克隆抗体细胞株,并对其特性进行分析。经鉴定,它们所分泌的抗体类型均为ＩｇＭ,腹水效价为１０－３～１０－６。相对亲和力分别为０．１μｇ／ｍｌ（Ａ９）、０．６５μｇ／ｍｌ（Ｂｌ）、１２．５μｇ／ｍｌ（Ｇ４）和２３μｇ／ｍｌ（Ｄ４）。与其他１０种鼠源性病毒均无交叉反应,表明ＭｃＡｂ具有良好的特异性。单抗标记ＦＩＴＣ后用于人用鼠源性单抗制品及各种传代细胞和原代细胞中ＭＡｄ检测,获得良好的实验结果。     

酪氨酸-铜体系电化学氧化行为的研究

在ｐＨ值３．９４的Ｂ－Ｒ缓冲溶液中,酪氨酸－铜络合物在玻碳电极出现氧化峰。用新极谱法测定,酪氨酸浓度在０．３μｇ／ｍｌ－３μｇ／ｍｌ范围内与氧化峰的２．５次微分值呈线性,检测下限０．２μｇ／ｍｌ。直接用于氨基酸药物样品的测定结果满意,并对酪氨酸－铜络合物的电化学氧化行为进行了研究。     

生物素—链霉亲和毒免疫学法测定地高辛的研究

采用国产链霉亲和素直接包被塑料板孔,生物素标记抗体,建立的竞争酶联免疫吸附试验的方法测定血中地高辛浓度,其测定灵敏度为０．９６４μｇ／Ｌ最低检测限为０．２２５１μｇ／Ｌ,测定三份低,中、高浓度的血甭标本,批内变异系数为８．９％、５．９％、２．４％;批间变民系数为１５．８％、１０．１％、９．２％,测定回收率在８９．１－１０７．２２％之间,此法与ＦＰＩＡ方法相关良好。     

消化道疾病患者胃微生态环境的改变

本文对５９例具有消化不良症状的患者做了内镜检查。取胃粘膜组织进行细菌的分离培养,镜检,测定胃液中的ｓＩｇＡ的含量及ｐＨ。结果表明,不同消化道疾病,胃的微生态环境会发生不同的改变。其中胃癌患者改变最明显,胃内微生物检出率高,ｐＨ均大于４,ｓＩｇＡ含量１４０．５７±３７．４５μｇ／ｍｌ,幽门螺杆菌（ＨＰ）的检出率为６６．７％;溃疡组,ＨＰ的检出率为７９．２％,其它微生物检出率较胃癌组低,ｓＩｇＡ含量１３３．８０±６５．８４μｇ／ｍｌ;胃炎组,微生物的检出率较低,ｓＩｇＡ含量７１．００±６０．３８μｇ／ｍｌ,ｐＨ大部分在２一４。     

海南省潜伏香蕉果实的炭疽菌对特克多的抗药性

对来自海南省１３个地区的６７个Ｃｏｌｌｅｔｏｔｒｉｃｈｕｍ ｍｕｓａｅ（Ｂｅｒｋ．＆Ｃｕｒｔ．）Ａｒｘ菌株进行抗药性检测,所测菌株均表现出敏感,即未产生特克多抗药性。室内采用高浓度特克多和９０－９５％致死剂量紫外光进行抗性诱导,获得的抗性菌株均能在１０００μｇ／ｍｌ。特克多的ＰＤＡ培养基上生长,但ＥＣ５０值相差很大,最高达１３０μｇ／ｍｌ,而最低为０．８７μｇ／ｍｌ。抗性菌株对多菌灵和甲基托布津均     

乙型肝炎血源疫苗皮内接种4年效果观察

为了解乙型肝炎血源疫苗皮内接种的持久效果,选ＨＢｓＡｇ、抗－ＨＢｓ和抗－ＨＢｃ均（－）的９～１１岁儿童１０３名,随机分成４组,分别皮内接种１μｇ×４和３μｇ×４（均按０,１,２,５月程序）和肌肉接种１０μｇ×３和３０μｇ×３（各按０,１,２月程序）。首针后４８月时,１μｇ、３μｇ、１０μｇ和３０μｇ组抗－ＨＢｓ≥１０ｍＩＵ／ｍＩ者各为６９．２％,８０．０％、９２．３％和８１．８％;ＧＭＴ则为１４．５,７９．０,４４．８和７０．９ｍＩＵ／ｍｌ,３μｇ×４皮内免疫的近期和远期效果与肌肉组３０μｇ×３相似,宜于某些人群采用     

放线菌素23-21微生物检定法及HPLC法比较

采用微生物检定法测定放线菌素２３－２１的抗菌活性,检定菌为枯草芽孢杆菌。当放线菌素２３－２１的浓度为０．９１～４．３７μｇ／ｍｌ时,其抑菌圈直径与反应剂量有线性关系。经生物学统计分析,实验结果可靠。并与高效液相色谱法（ＨＰＬＣ）进行对照检测,实验结果基本吻合。     

氧代赖氨酸抗真菌作用机制的初步研究

氧代赖氨酸对致病真菌类秃发念珠菌的ＭＩＣ为０．８－３．１μｇ／ｍｌ,而两性霉素Ｂ为１．６－３．１μｇ／ｍｌ．氧代赖氨酸高于赖氨酸１０倍浓度,无明显抑制白含珠菌对Ｌｙｓｉｎｅ的吸收。Ｏｘａｌｙｓｉｎｅ０．４ｍｍｏｌ／Ｌ对白色念珠菌细胞膜透性,如胞内物于ＵＶ２６０ｎｍ下的吸收物质外泄无明显影响。放射性前体物渗入试验结果指出,Ｏｘａｌｙｓｉｎｅ０．４ｍｍｏｌ／Ｌ弱抑制（＾１４Ｃ）－Ｍｅｔｈｉｏｎｉｎ和（     

非线性模型在蛋白质薄膜厚度测定中的应用

分子通过测定蛋白质薄膜厚度变化而定量地研究生物分子间的相互作用,探讨了基于光学干涉光的薄膜厚度的测量方法,借助于在玻璃基底表面沉积的聚苯乙烯薄膜对噪声的抑制,使用非线性回归模型对生物传感器的检测信号进行了分析。通过反射干涉光谱光测定到乙型肝炎表面抗原在聚苯乙烯－玻璃表面的吸附使薄膜厚度增加了３．３ｎｍ。随着５μｇ／ｍｌ,１０μｇ／ｍｌ,２０μｇ／ｍｌ,３０μｇ／ｍｌ和５０μｇ／ｍｌ浓度的乙型肝炎表     

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.