鸡痘母源抗体对重组鸡痘疫苗免疫效果的影响

为了检测抗鸡痘病毒母源抗体对喉气管炎重组鸡痘疫苗的影响,孵化一批来自禽痘病毒高免母鸡的雏鸡,采用ELISA方法检测鸡痘疫苗免疫鸡后代的血清抗体。检测结果表明,雏鸡自孵出2d开始,血清鸡痘病毒抗体水平就开始缓慢下降,到15日龄时下降至临界值,已有部分鸡开始出现抗体阴性反应;到21日龄时,全部被检血清抗体水平均转为阴性。分别于不同日龄对试验雏鸡免疫接种重组鸡痘疫苗,结果只有当鸡体内的鸡痘病毒母源抗体全部为阴性(21日龄)后免疫时才能产生可靠的保护作用,保护率达到80％以上。这说明鸡痘病毒母源抗体对重组鸡痘疫苗的效果有一定的影响,因此重组疫苗合理的首免时间应选择在3周龄以后。     

影响喜树腋芽离体再生因素研究(英文)

本文以温室三年生喜树腋芽为外植体,研究了不同的基本培养基和基本培养基中添加不同浓度生长调节物质(BA 或TDZ)、蔗糖、琼脂以及培养基的pH 值对喜树腋芽分化的影响。结果表明:WPM 和B5 培养基适合喜树腋芽的诱导,MS 培养基不利于喜树腋芽的诱导。适合喜树腋芽增殖和分化的最佳生长调节物质为BA 1.0mg/L 或TDZ 0.1mg/L;最佳的蔗糖浓度为30g/L;最佳的琼脂浓度为6g/L;pH5.8-6.6 的范围均适合喜树腋芽的诱导,但最佳的pH 值为5.8。图1 表5 参14。     

禽流感病毒H5亚型及H7亚型基因的引物设计与多重RT-PCR扩增（英文）

[Objective] The research aimed to design primers that are suitable for detecting H5 and H7 subtypes of avian influenza virus(AIV);[Method] DNAStar was used to analyze the homology of the sequences of H5 and H7 subtypes of AIV accessed in GenBank,and design primers(by Primer Premier 5.0)on high homologous region of these sequences,and then amplified by RT-PCR.[Result] The multiplex RT-PCR amplification,agarose gel electrophoresis and sequencing results showed that the self-designed primers are successful for detecting AIV.[Conclusion] It is feasible to rapidly diagnose AIV through this method.     

桑叶和日本花柏心材外缘精油的组成(摘要)(英文)

[目的]探究桑叶和日本花柏心材外缘精油的组成。[方法]通过气相色谱-质谱分别分析了桑叶精油和日本花柏心材外缘精油的挥发性成分。[结果]醇类[植醇(59.47%,桑叶3h提取)、α-杜松醇(38.77%,日本花柏心材外缘6h提取)]是它们第一挥发性主成分。植醇通常用作药用原料,α-杜松醇是具有抑菌功能的活性有机化合物。[结论]水蒸馏提取的桑叶精油和日本花柏心材外缘精油具有药用价值。     

高白鲑仔鱼饲育

为解决高白鲑仔鱼饲育期与室外鱼池放养期不同步的矛盾,采取室内流水,集约化饲育方式,利用活饵料与人工配合饲料投喂.在透明度较高的涌泉水中,水温8-13℃,溶解氧8-10毫克/升,水交换量为14～16升/分的条件下,以每平方米放养6000尾的密度,并采取综合管理技术,经30天的饲育,其每日可增长0.3毫米,增重0.66毫克,其绝对增长量由3.5毫克平均增长至18.51毫克,全长由9.7毫米增长至18.4毫米,成活率可达73.78%-82.91%.     

NBS-LRR Proteins and Their Partners:Molecular Switches of Plant Defense

Specificity of the plant innate immune system is often conferred by resistance（R）proteins.Most plant disease resistance （R）proteins contain a series of leucine-rich repeats（LRRs）,a nucleotide-binding site（NBS）,and a putative amino-terminal signaling domain.They are termed NBS-LRR proteins.The LRRs are mainly involved in recognition,and the amino-terminal domain determines signaling specificity,whereas the NBS domain presumably functions as a molecular switch.During the past years,the most important discoveries are the role of partners in NBS-LRR gene mediated defenses,mounting support for the so-called＂guard hypothesis＂of R gene function,and providing evidence for intramolecular interactions and intermolecular interactions within NBS- LRR proteins as a mode of signaling regulation.The outcome of these interactions determines whether a plant activates its defense responses.     

黑龙江省伊春林区低质林林分评定

通过对黑龙江省伊春林区低质林林分的实地调查,从林分树种组成、水平结构、垂直结构、林木离散程度等4个方面进行定量分析,得出该林分树种组成广泛,但经济价值高的树种所占比例较少;林分树高上、中、下3层林木株数之比为1:3.81:2.46;相邻径级株数之比均值为1.205;聚集指数为0.3045.从数值上进一步分析了低质林林分的树种、径级、树高及空间布局的特征,丰富和完善了低质林界定和分类标准.     

Isolation and Identification of three Lactobacilli and Research on Antimicrobial Activity in Vitro

Collected from the broiler cecal contents, bacteria were isolated and purified. These isolated and purified Lactobacilli were detected by acidity and bile salt tolerant test, then three better tolerant strains were screened out. These three strains were conducted to observe the morphous through microscope, perform Gram stain, and to identify their physiological and biochemical characteristics. The results showed that L1 was L.casei, L2 was L.gasseri and L3 was L.graminis. With Oxford Cup method, these three Lactobacilli were detected for their bacteriostasis. Results showed that L1, L2 and L3 strains had strong antibacterial activities to E. coli and Salmonella.     

热激处理对白桦幼苗温度适应的影响

以白桦为研究对象 ,人为模拟高温 ,以质膜相对透性和丙二醛含量为主要测定指标 ,比较了不同高温和不同处理时间对 1年生白桦幼苗的伤害程度以及高温预处理对白桦幼苗温度适应的影响 .结果表明 ,膜相对透性及丙二醛含量在 37℃和 4 2℃热激处理的 2 4h期间出现升、降、升的变化趋势 ,但 37℃ 2～ 4h处理为白桦热激反应的理想条件 .37℃ 4h热激预处理既可提高白桦幼苗的耐冷性又可提高白桦幼苗的耐热性     

利用植物生物反应器生产口服疫苗的进展

利用植物生物反应器生产口服疫苗已成为目前研究的热点。与传统疫苗相比,植物源性疫苗具有安全、稳定、高效和廉价等优点。植物作为生产疫苗的载体可将抗原表达于植物的可食部位(例如种子和块茎)。当植物被食用或饲喂时,植物源性疫苗可激发保护性的黏膜免疫反应。随着生物技术的不断完善,植物生物反应器将会成为疫苗生产的有效途径,并部分替代传统疫苗的生产方式。本文综述了植物源性口服疫苗的研究进展,并对可能出现的问题及解决途径进行了探讨。