Effects of aplastic anemia patient serum on the expression of the crucial cyclin D isoform in cord blood CD34+ cells

AIM:To explore the pathogenesis of aplastic anemia (AA), we identified the crucial isoform of cyclin D that determine the proliferation of the cord blood CD34+ cells and observed effects of AA serum on the expression of crucial cyclin D isoform in umbilical cord blood CD34+ cells. METHODS:The CD34+ cells were isolated with MIDI-MACS system. The isoforms of cyclin D were detected by RT-PCR and Western blotting. Methylcellulose culture system was used to measure the formation of CFU-GM. The expression level of crucial cyclin D isoform was assayed by RT-PCR and Western blotting after the CD34+ cells were incubated in AA serum. RESULTS:The crucial cyclin D isoform in CD34+ cells was cyclin D3. The AA serum inhibited the formation of CFU-GM and down-regulated expression level of the cyclin D3 from the mRNA to protein level, respectively. CONCLUSION:The AA serum inhibits the proliferation of CD34+ cells and down-regulates level of cyclin D3, this may be one of hematopoiesis inhibition mechanisms in AA.     

鸵鸟输尿管和泄殖道的组织学研究

为了研究鸵鸟与其他鸟纲动物排泄行为差异的形态学,试验采用常规石蜡切片,H.E.染色,对8只非洲鸵鸟输尿管和泄殖道的组织结构进行了研究。结果表明:非洲鸵鸟的输尿管管壁由黏膜、肌层和外膜组成,其上皮为假复层柱状上皮,部分为单层柱状或变移上皮;泄殖道黏膜上皮为假复层柱状上皮、单层柱状上皮及少量变移上皮,其中分布许多杯状细胞。说明非洲鸵鸟输尿管和泄殖道的组织结构不同于其他鸟纲动物,其泄殖道不但有贮存大量尿液的功能,而且还对水分有重吸收作用。     

Stk2, a Mitogen-Activated Protein Kinase from Setosphaeria turcica,Specifically Complements the Functions of the Fus3 and Kss1 of Saccharomyces cerevisiae in Filamentation,Invasive Growth,and Mating Behavior

Setosphaeria turcica, an essential phytopathogenic fungus, is the primary cause of serious yield losses in corn; however, its pathogenic mechanism is poorly understood. We cloned STK2, a newly discovered mitogen-activated protein kinase gene with a deduced amino acid sequence that is 96% identical to MAK2 from Phaeosphaeria nodorum, 56% identical to KSS1 and 57% identical to FUS3 from Saccharomyces cerevisiae. To deduce Stk2 function in S. turcica and to identify the genetic relationship between STK2 and KSS1/FUS3 from S. cerevisiae, a restructured vector containing the open reading frame of STK2 was transformed into a fus3/kss1 double deletion mutant of S. cerevisiae. The results show that the STK2 complementary strain clearly formed pseudohyphae and ascospores, and the strain grew on the surface of the medium after rinsing with sterile water and the characteristics of the complementary strain was the same as the wild-type strain. Moreover, STK2 complemented the function of KSS1 in filamentation and invasive growth, as well as the mating behavior of FUS3 in S. cerevisiae, however, its exact functions in S. turcica will be studied in the future research.     

98株鸭源致病性大肠杆菌氨基糖苷类耐药基因型与耐药表型的比较

旨在调查鸭致病性大肠杆菌氨基糖苷修饰酶耐药基因(AMEs基因)的携带情况,探讨耐药基因与氨基糖苷类抗生素耐药表型的相关性。对98株鸭致病性大肠杆菌采用了K-B法,选用氨基糖苷类抗生素链霉素、新霉素、庆大霉素、阿米卡星、大观霉素和卡那霉素进行药敏试验,用建立的检测氨基糖苷类AMEs主要基因的四重PCR方法对上述菌株进行分子检测,并随机选取耐药基因ant(3″)-Ⅰa、aac(3)-Ⅱa和aph(3′)-Ⅱa各3个阳性扩增进行克隆测序,对药敏试验结果和基因检测结果进行比较分析。结果表明,98株鸭致病性大肠杆菌有67株对上述氨基糖苷类药物中的一种或多种耐药,耐药率为68.4%(67/98);有49株扩增出AMEs基因,AMEs基因的检出率为50%(49/98),其中ant(3″)-Ⅰa的检出率为30.6%(30/98),aac(3)-Ⅱa为13.3%(13/98),aph(3′)-Ⅱa为3.1%(3/98),ant(3″)-Ⅰa+aac(3)-Ⅱa为2.0%(2/98)、aac(3)-Ⅱa+aph(3′)-Ⅱa为1.0%(1/98),未检出aac(6′)-Ⅰb基因;序列分析结果表明,扩增产物与GenBank中的相应序列有很高的同源性(99%);AMEs耐药基因与耐药表型的符合率为73.1%(49/67),符合率从高到低依次为大观霉素60%(3/5)、庆大霉素55%(11/20)、链霉素33.3%(22/66)、卡那霉素19%(4/21)、新霉素12.5%(1/8)、阿米卡星0%(0/3)。另外有4株细菌检测到相关耐药基因但耐药表型为敏感,而有22株耐药表型为耐药却未检测到相关耐药基因。鸭致病性大肠杆菌氨基糖苷类耐药基因以ant(3″)-Ⅰa和aac(3)-Ⅱa两种为主,耐药性与相关耐药基因的检出率基本呈正相关。     

一种用于PCR的植物基因组DNA快速制备方法

本文介绍了一种用于PCR的植物基因组DNA的快速制备方法.该方法只需将少量(4～6 mg)植物叶片、适量(200μL)TE缓冲液、和一粒钨合金珠放入1个2 mL离心管,在多功能组织细胞研磨器中振动5 min破碎组织后,直接取1μL DNA溶液作为PCR的模板.本方法具有简单快速、操作效率高、成本低、扩增效果好等优点,特别适合于大量样品的基因型检测.     

向日葵与锈菌互作过程中活性氧的积累

为了探讨向日葵品种与锈菌互作中活性氧的产生和积累与向日葵抗锈病性的关系,采用分光光度计法及联苯胺蓝(DAB)、氮兰四唑(NBT)染色法对过氧化氢(H2O2)及超氧阴离子自由基(O2-)诱导积累的过程进行了检测.结果表明:接种后抗、感病品种均出现H2O2和O2-双峰,侵染早期积累明显,最高峰出现在16 h,在抗病品种中活性氧产生和积累明显高于感病品种;在抗病品种中侵染位点活性氧的产生及积累较明显,接种后16h,侵染位点周围的染色范围较大,染色较深,H2O2及O2-的染色比例均达到最高,分别为65.5%和41%;而在感病品种的侵染位点没有检测到明显的活性氧积累.     

Simulation of groundwater table dynamics based on Feflow in the Minqin Basin,China

As groundwater table declination is an important factor resulting in degradation of eco-environment in the Minqin Basin,China,it is significant to investigate and understand the groundwater table dynamics in this area. According to the physical and geographical conditions of the Minqin Basin,a hydrogeological conceptual model and a mathematical model were established,and the mathematical model was figured out by using Finite Element subsurface Flow system(Feflow).Accurate hydrogeological parameters were acquired,and the spatio-temporal distribution dynamics of groundwater table for 1983–2001 were also simulated.The model performed well with a correlation coefficient of 0.977 and a mean error of 0.9768 m.The inflow and outflow of the groundwater system were predicted by time series analysis,and the groundwater table dynamics for 2011 were further acquired.Generally the groundwater table in the Minqin Basin would continue to decline.The groundwater table would decline during spring and summer irrigation,while it would rise during autumn-winter irrigation.The groundwater depression cones would expand with the increase of center depths.Therefore,regulatory measures should be taken to prevent the declination of groundwater table and improve the eco-environment of this area.     

不同浓度芦丁和冷冻速率对猪精子冷冻保存效果的研究

【目的】 探讨冷冻稀释液中添加不同浓度芦丁和不同冷冻速率对杜洛克公猪精子冷冻保存效果的影响及其二者的互作关系,以期为指导生产实践和提高优良种猪利用率提供依据。【方法】 试验分为6组,分别为空白对照组（冷冻稀释液Ⅰ液）和试验组（分别在冷冻稀释液Ⅰ液中添加0.2、0.4、0.6、0.8和1.0 mmol/L芦丁）,在距离液氮面上1 cm （快冷冻）和3 cm （慢冷冻）处分别进行冷冻。在液氮中保存30 d后,检测冷冻-解冻精子的运动参数、质膜完整率（MI）、顶体完整率（AI）、DNA完整率、线粒体膜电位（MMP）、活性氧（ROS）水平、丙二醛（MDA）和ATP含量,以及超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽过氧化物酶（GSH-Px）的活性来评价解冻后的精液品质。【结果】 冷冻速率方面,在相同浓度芦丁冷冻液中,慢冷冻效果均好于快冷冻效果,差异显著（P<0.05）。芦丁浓度方面,快冷冻和慢冷冻组均以添加0.6 mmol/L芦丁的效果最好（P<0.05）,添加0.8 mmol/L芦丁的效果次之。二者互作方面,冷冻速率与芦丁浓度间存在交互作用,其中慢冷冻×0.6 mmol/L芦丁组合的精子的运动参数、质膜完整率、顶体完整率、DNA完整率、线粒体膜电位、ATP含量均显著高于其他组合试验组（P<0.05）,ROS水平显著低于其他组合试验组（P<0.05）,SOD、CAT和GSH-Px的活性较其他组合试验组均显著提高（P<0.05）。【结论】 不同芦丁浓度与不同冷冻速率间存在互作效应,其中在冷冻稀释液中添加0.6 mmol/L芦丁慢冷冻猪精子效果最好。     

辽宁省一起野禽H5N6高致病性禽流感疫情的紧急流行病学调查

2021年4月6日,辽宁省沈阳市和平区长白岛森林公园内饲养的10只黑天鹅和1只大雁死亡,袭击率为3.8％(11/291).经现场调查和临床剖检诊断,市级和省级疫病控制中心实验室检测,诊断为疑似H5亚型高致病性禽流感.随后,经国家禽流感参考实验室确诊为H5N6亚型高致病性禽流感.4月12日,农业农村部公布了该起疫情.在接...     

基于分形理论的结合面静摩擦因数改进模型

从理论上提出了一种基于分形理论的结合面静摩擦因数改进模型,表示出结合面静摩擦因数与无量纲法向总载荷之间非线性隐函数关系。仿真结果表明,静摩擦因数f随着法向总载荷P*和材料特性参数φ的增加而增加,随分形特征尺度参数G*的增加而减小,静摩擦因数f与法向总载荷P*呈微凸弧非线性关系;分形维数D在1.1～1.4范围内,静摩擦因数f随着D的增加而增加,在1.5～1.9范围内,静摩擦因数f随着D的增加而减小;研究表明该模型可以用于进行结合面静摩擦因数的预测。