运城盐湖细菌群落结构及生态多样性分析

运城盐湖作为一个人类活动深入参与的高盐环境,其中的细菌群落结构及生态多样性既有盐湖环境的共性,又有自身的特殊性。【目的】运城盐湖湖水颜色丰富,蕴含着大量嗜盐及耐盐微生物资源。为了深入探究运城盐湖细菌资源分布规律,对不同水域中细菌多样性和群落结构进行研究,探讨运城盐湖不同水域中细菌群落结构的变化规律。【方法】基于16S rRNA基因的扩增子高通量测序,对运城盐湖不同水域的细菌群落结构进行分析,同时对微生物的潜在代谢功能进行预测。【结果】运城盐湖不同水域中的优势细菌类群有所差异,在盐湖中部,假单胞菌门(Pseudomonadota)、放线菌门(Actinobacteriota)和拟杆菌门(Bacteroidota)是优势类群;而在运城盐湖东部,芽孢杆菌门(Bacillota)则是主要类群;在运城盐湖西部,髌骨菌门(Patescibacteria)类群较为丰富。对运城盐湖不同区域的细菌多样性进行分析,数据显示盐湖中部浅黄色湖水中微生物多样性显著高于盐湖东部和西部区域,但盐湖中部红色湖水区域的微生物多样性较低。另外,在盐湖中部,湖水颜色不同的区域细菌物种分布也具有较大的差异。对运城盐湖细菌代谢功能进行预测分析发现,在盐湖不同区域的微生物参与的代谢通路活性各不相同,表现出较强的区域分布性,盐湖东部和西部的微生物代谢比盐湖中部更具有活性。【结论】运城盐湖微生物多样性丰富,不同水域的细菌多样性具有显著差异,盐湖不同水域的环境对细菌群落结构具有一定影响。本研究为运城盐湖细菌资源多样性的保育及开发利用提供了重要的理论基础。     

利用内蛋白子剪切功能一步纯化重组人神经营养因子-3

将人神经营养因子 - 3(h NT3)基因插入含内蛋白子 -几丁质结合区 (Intein- CBD)片段的质粒p TXB1的多克隆位点 ,构建成重组子 p TXB- h NT3,随后转化入 E.coli 2 566并进行融合表达 .表达产物包涵体经 8mol/ L脲变性 ,并在 GSH,GSSG存在下复性 .复性后的融合蛋白经几丁质珠亲和柱吸附 .待洗涤杂蛋白后 ,加入 50 mmol/ L DTT在 4℃或 2 5℃进行剪切反应 48h,再用缓冲液洗脱 ,即得 h NT3.SDS- PAGE分析表明 ,h NT3达电泳纯 .其分子量约为 1 4 k D     

网翅蝗科三种蝗虫卵子发生的比较研究(直翅目:蝗总科)

通过组织学观察与测量对网翅蝗科(直翅目:蝗总科)中3种蝗虫卵子发生各阶段进行比较和分析,3种蝗虫分别为:绿牧草蝗Omocestus viridulus(Linnaeus),素色异爪蝗Euchorthippus unicolor(Ikonn.)和条纹异爪蝗Euchorthippus vittatus Zheng。结果表明,在蝗虫卵子发生过程中,卵母细胞体积和形态变化显著,呈现指数增长模式;细胞核体积增长在发育初期增长显著,后期变化不显著;滤泡细胞体积和形态及数量呈现周期性变化规律;比较种间差异发现不同种蝗虫的卵子发生存在不同的发育进程。     

Comparative study on gut microbiota in three Anura frogs from a mountain stream

Composition and diversity in gut microbiota are impacted by a wide variety of factors. The similarity of gut microbiota in related or sympatric species has been gaining recent traction. Here, 16S rRNA gene sequencing technology was employed to study the gut microbiota of three sympatric frog species, namely Odorrana tormota, O. graminea, and Amolops wuyiensis. In these three frog species, the most abundant phylum was Proteobacteria, followed by Bacteroidetes, Verrucomicrobia, and Firmicutes. The most abundant family was Burkholderiaceae in three species. The most dominant genera were Burkholderia, Caballeronia, and Paraburkholderia with the highest relative abundance in O. tormota, O. graminea, and A. wuyiensis, respectively. No differences were observed in alpha diversity indexes among the three frog species. However, bacterial similarity of gut microbiota was significantly different between O. tormota and A. wuyiensis and between O. graminea and A. wuyiensis. Metabolism‐related gene function was predominantly enriched in the gut microbiota of the three evaluated frog species. From these findings, that the relative abundance of the gut microbiota and predicted gene functions differed in three species, we conclude that there were significant differences in the gut microbiota of the three species. Similar alpha diversity and interspecific bacterial similarity in the gut might be related to bacterial transmission among the three Anura frogs evaluated in this study.     

Targeted magnetic iron oxide nanoparticles for tumor imaging and therapy

Magnetic iron oxide (IO) nanoparticles with a long blood retention time, biodegradability and low toxicity have emerged as one of the primary nanomaterials for biomedical applications in vitro and in vivo. IO nanoparticles have a large surface area and can be engineered to provide a large number of functional groups for cross-linking to tumor-targeting ligands such as monoclonal antibodies, peptides, or small molecules for diagnostic imaging or delivery of therapeutic agents. IO nanoparticles possess unique paramagnetic properties, which generate significant susceptibility effects resulting in strong T2 and T*2 contrast, as well as T1 effects at very low concentrations for magnetic resonance imaging (MRI), which is widely used for clinical oncology imaging. We review recent advances in the development of targeted IO nanoparticles for tumor imaging and therapy.     

辽宁省2007～2012年流行风疹病毒基因特征分析

为了解辽宁省2007~2012年流行性风疹病毒基因特征,本研究用Vero/Slam细胞从辽宁省2007~2012年风疹暴发和散发患者的咽拭子标本中分离到145株风疹病毒(Rubella,RV),应用逆转录-聚合酶链反应(RT-PCR)扩增RV分离株E1基因的945个核苷酸片段,对扩增产物进行序列测定和分析。将辽宁省145株RV与世界卫生组织(WHO)RV 13个基因型的32株参考株基于739个核苷酸片段的基因定型序列构建基因亲缘性关系树。结果提示,辽宁省2007~2012年145株RV分离株均属于1E基因型,核苷酸和氨基酸同源性为97.2%~100.0%和97.6%~100.0%。与2株WHO 1E基因型参考株(Rvi/Dezhou.CHN/02,RVi/MYS/01)序列相比,核苷酸和氨基酸同源性分别为96.6%~99.2%和98.2%~100.0%.除RVi/Shenyang.Liaoning.CHN/13.11/13株病毒在E1基因的第246位发生了突变(Val246-Ala246);RVi/Shenyang.Liaoning.CHN/13.11/4和RVi/Liaoyang.Liaoning.CHN/26.11/2株病毒在E1基因的第262发生相同突变(Asp262-Asn262)外,其他毒株在N-型糖基化位、血凝抑制位点和中和位点等重要抗原位点均未发生变化,抗原性稳定。辽宁省所有1E基因型风疹病毒在E1蛋白的第338位氨基酸发生相同突变(Leu338-Phe338)。本研究证实1E基因型为辽宁省RV的优势基因型,近6年来辽宁省风疹疫情是由1E基因型RV的多个传播链引起。     

1株高效花生根瘤菌的筛选与鉴定

从辽宁多地花生种植土壤及其鲜根瘤初步筛选到30株花生根瘤菌,进一步通过回接盆栽花生,测定花生根瘤数、根瘤干重,以及鲜根瘤固氮酶活性、植株全氮量等,筛选出1株结瘤固氮能力较强花生根瘤菌wz-6,通过16S rDNA序列分析,鉴定为圆明慢生根瘤菌(Bradyrhizobium yuanmingense)。为开发优质花生根瘤菌菌剂奠定基础。     

4′-甲醚-黄芩素对绒癌耐药细胞株多药耐药性的逆转作用研究

为探讨马鞭草中4′-甲醚-黄芩素对人绒癌JAR/VP16耐药细胞株的多药耐药逆转作用及可能的逆转机制,采用四甲基偶氮唑盐比色、透射电镜观察、逆转录多聚酶链反应、流式细胞术、基因芯片以及实时定量PCR等方法,检测到4'-甲醚-黄芩素对化疗药物具有协同增效作用,显著逆转耐药细胞对鬼臼乙叉甙(VP16)、甲氨蝶呤(MTX)及更生霉素(KSM)的耐药性,该药物作用后,耐药细胞超微结构呈现凋亡样改变,细胞凋亡率增高并出现明显凋亡峰.此外,耐药细胞中MDR1、MRP1、MRP2、MRP6、AHR、COMT、FGF2等耐药相关基因以及Bcl-2、BFL1、NAIP、p63等凋亡抑制基因表达降低,而Apaf-1、ASC、ATM、Bad、Bak、Bax、BimL等凋亡促进基因表达升高.上述实验结果表明:4′-甲醚-黄芩素对绒毛膜癌耐药细胞具有显著的耐药逆转作用,这种逆转作用可能是通过降低耐药基因表达、促进细胞凋亡实现的.