猪α干扰素重组腺病毒的构建及其抗口蹄疫病毒活性研究

本研究利用RT-PCR方法扩增猪α干扰素成熟蛋白基因后构建了重组腺病毒质粒pAd-poIFN-a,经PacI酶切后转染HEK-293A细胞,3次噬斑纯化后获得了重组腺病毒rAd-poIFN-α.该重组腺病毒于HEK-293A细胞连续传代至20代滴度稳定,为107 TCID50/mL.RT-PCR检测证明目的基因在mRNA水平上可有效表达;在PK-15细胞上可以检测到较强的抗猪口蹄疫病毒活性,从而为研究猪口蹄疫免疫防治新技术奠定了重要基础.     

抗坏血酸对酵母蔗糖酶的激活动力学研究

采用甲苯自溶法从鲜酵母中提取了蔗糖酶,并用乙醇分级及ＤＥＡＥ－纤维素柱层析进行了纯化,用ＰＡＧ凝胶电泳作了纯度鉴定,在ｐＨ５．０,３０℃条件下进行了酶反应,用双倒数作图法测出其Ｋｍ＝２．１×１０－２ｍｏｌ／Ｌ,Ｖｍａｘ＝０．２６（每分钟的光密度值）．在此系统中,加入不同浓度的抗坏血酸（Ｖｉｔ．Ｃ）,发现其具有激活作用并存在量效关系．双倒数作图显示：酶的表观Ｖｍａｘ（Ｖｐ）随抗坏血酸浓度的增加而增大,但其表观Ｋｍ（Ｋｐ）不变（Ｋｐ＝Ｋｍ）．经实验结果分析,推论出抗坏血酸激活作用的酶促反应方程式,并推导出反应速度公式     

小檗科鬼臼亚科种子大小变异式样及其生物学意义

分析了小檗科鬼臼亚科４个属代表植物桃儿七、川八角莲、南方山荷地以足叶草种子大小及共变异式样并对该变异式样的生物学意义予以分析。结果显示：（１）在４种植物干种子中,以川八角莲最重,为３７．２４±６．７１ｍｇ,桃儿七镒之,为３６．５６±４．５４ｍｇ,足叶草最轻,为１９．０１±３．２１ｍｇ,南方山荷叶较轻足叶草稍重,为２３．２２±３．２６ｍｇ;（２）每种植物均存在一定比例的活力低下种子,其中以桃儿七最低     

糖原磷酸化酶BB在心脏直视手术后心肌损伤中的判定价值

目的:探讨糖原磷酸化酶BB对心脏直视手术后心肌损伤的判定价值.方法:108例行心脏瓣膜置换手术患者,分别于围术期多个时点取桡动脉血,测定血清糖原磷酸化酶BB、心肌肌钙蛋白I(cTnI)、肌酸磷酸激酶同工酶(CKMB)的水平,并检测心肌细胞凋亡程度.结果:血清糖原磷酸化酶BB于体外循环主动脉开放后最早达峰值,其峰值与cT...     

Isolation and characterization of dengue virus serotype 2 from the large dengue outbreak in Guangdong,China in 2014

Dengue has been well recognized as a global public health threat,but only sporadic epidemics and imported cases were reported in recent decades in China.Since July 2014,an unexpected large dengue outbreak has occurred in Guangdong province,China,resulting in more than 40000 patients including six deaths.To clarify and characterize the causative agent of this outbreak,the acute phase serum from a patient diagnosed with severe dengue was subjected to virus isolation and high-throughput sequencing(HTS).Traditional real-time RT-PCR and HTS with Ion Torrent PGM detected the presence of dengue virus serotype 2(DENV-2).A clinical DENV-2 isolate GZ05/2014 was obtained by culturing the patient serum in mosquito C6/36 cells.The complete genome of GZ05/2014 was determined and deposited in Gen Bank under the access number KP012546.Phylogenetic analysis based on the complete envelope gene showed that the newly DENV-2 isolate belonged to Cosmopolitan genotype and clustered closely with other Guangdong strains isolated in the past decade.No amino acid mutations that are obviously known to increase virulence or replication were identified throughout the genome of GZ05/2014.The high homology of Guangdong DENV-2 strains indicated the possibility of establishment of local DENV-2 circulation in Guangdong,China.These results help clarify the origin of this epidemic and predict the future status of dengue in China.     

经鼻内镜手术进展

颅底手术正随着经鼻内镜手术的发展而发生着转变。经鼻内镜手术最初开发于鼻窦手术,但其适应症已逐渐扩大到其它领域,可以用于治疗大量的疾病。经鼻内镜手术的主要优点是：它利用天然的孔道来处理大量的颅内、鼻窦病变,避免了皮肤切口、面部骨瓣切口、脑回缩等直接开颅所不可避免的后遗症。与传统的神经外科手术相比,发病率和死亡率下降,并间接减少了住院时间和管理成本。本文就经鼻内镜手术的进展进行综述。在综述中阐述了经鼻内镜手术的适应症和基本原则,以及显露、特别是重建技术的进展,这些进展要求在可接受的并发症前提下达到更广泛的切除;讨论了经鼻内镜手术的局限性,尤其是,虽然这种手术往往是“微创”,但它并不是完全没有并发症;展望了经鼻内镜手术的适应症会不断拓宽,并发症会越来越少的美好未来。     

黄连素和黄芩苷不同配伍对肠道细菌体外生长的影响

研究不同配伍的黄连素和黄芩苷在模拟肠道厌氧环境下对肠道内有害菌、条件致病菌和益生菌体外生长的影响。

采用微量肉汤稀释法测定黄连素和黄芩苷不同配伍对肠道内金黄色葡萄球菌、沙门菌、肠炎链球菌、大肠埃希菌、乳杆菌及嗜黏蛋白阿克曼菌体外生长24 h后吸光度的影响。

对于金黄色葡萄球菌,抑制作用最强的是黄连素∶黄芩苷 = 10∶1（组合六）125 μg/mL（t = –39.350,P＜0.001）,抑制率为99.91%;对于沙门菌,抑制作用最强的是黄连素∶黄芩苷 = 100∶1（组合七）250 μg/mL（t = –73.788,P＜0.001）,抑制率为80.47%;对于肠炎链球菌,抑制作用最强的是黄连素∶黄芩苷 = 1∶0（组合一）250 μg/mL（t = –57.549,P＜0.001）;对于大肠埃希菌,抑制作用最强的是黄连素∶黄芩苷 = 1∶0（组合一）125 μg/mL（t = –29.085,P＜0.001）;对于乳杆菌,增殖作用最强的是黄连素∶黄芩苷 = 100∶1（组合七）31.25 μg/mL（t = 76.280,P＜0.001）;对于嗜黏蛋白阿克曼菌,增殖作用最强的是黄连素∶黄芩苷 = 100∶1（组合七）62.5 μg/mL（t = 8.357,P＜0.001）。

黄连素∶黄芩苷 = 10∶1（组合六）、黄连素∶黄芩苷 = 100∶1（组合七）对有害菌的抑制作用更强,黄连素∶黄芩苷 = 100∶1（组合七）对益生菌的增殖作用更强,而黄连素和黄芩苷联合使用对条件致病菌的抑制作用较弱。

     

中国林蛙皮肤抗菌肽抗菌的特性

从林蛙皮肤中分离到具有抗菌活性的多肽混合物——多肽FⅢ。抑菌实验表明,林蛙皮肤中小分子活性肽对革兰氏阳性细菌、革兰氏阴性细菌都具有一定的抗菌作用,并且此粗提物的抗菌活性远远高于传统食品防腐剂苯甲酸钠和山梨酸钾的抗菌活性。     

Two New Diophrys‐Like Genera and Their Type Species,Apodiophrys ovalis n. g., n. sp. and Heterodiophrys zhui n. g., n. sp. (Ciliophora: Euplotida), with Notes on Their Molecular Phylogeny

ABSTRACT. Based on both morphological and molecular information, two new euplotid genera Apodiophrys n. g. and Heterodiophrys n. g. are described in the present paper. Apodiophrys n. g. is defined as sculptured Diophryinae with bipartite adoral zone; frontoventral cirri arranged in Diophrys‐pattern; marginal cirri located in two clearly separated groups. Heterodiophrys n. g. is recognizable by the combination of Diophrys‐like frontoventral cirri and the unique structure of several marginal cirri that are arranged in a long row. The type species for both new genera, Apodiophrys ovalis n. sp. and Heterodiophrys zhui n. sp., collected from southern China sea, are described. The small subunit rRNA (SSU rRNA) gene sequences for both new taxa are determined. Phylogenetic analyses based on these data indicate that Apodiophrys is most closely related to Paradiophrys, which then clusters with Uronychia species. Thus, Apodiophrys–Paradiophrys is separated from other typical Diophrys‐like genera in the SSU rRNA gene trees. The new genus Heterodiophrys is basal to the sister group of Diophrys–Diophryopsis, hence belongs to the “core”Diophrys‐complex.