胶体金法与ELISA法检测猪瘟抗体结果对比分析

为了比较胶体金法与ELISA法检测猪瘟抗体的结果符合率,以了解胶体金法的特异性与敏感度,用胶体金法和ELISA法平行检测受检猪血清标本猪瘟抗体滴度。结果表明．胶体金法和ELISA法检测猪瘟抗体的结果符合率为86．6％．用胶体金法检测猪瘟抗体存在漏检及误诊（即假阴性、假阳性）。说明胶体金法较ELISA法敏感度、特异度低,用胶体金法检测猪瘟抗体滴度存在一定程度的漏检率及误诊率,胶体金法只能初步筛查猪瘟抗体．有一定技术力量的县级兽医实验室使用EUSA法检测猪血样的猪瘟抗体滴度更为合适,对于胶体金法筛查阴性的猪血样．建议用ELISA法复检以防漏检。     

猪瘟胶体金快速诊断法的研究进展

胶体金免疫层析技术是一种新型的免疫检测技术,具有操作简单、方便快速、特异性强、灵敏度高、无需特殊仪器等优点。本文简要阐述了胶体金技术在检测猪瘟抗原及猪瘟抗体上的应用现状,并提出了该技术目前存在的问题及未来的发展方向。     

胶体金法与酶联免疫吸附测定法检测猪瘟抗体的比较

为比较胶体金法与ELISA法检测猪瘟抗体的符合率,以了解胶体金法的特异性与敏感度,用胶体金法和ELISA法平行检测受检猪血清标本猪瘟抗体滴度.结果表明,胶体金法和ELISA法检测猪瘟抗体的结果符合率为86.6％,胶体金法较ELISA法敏感度、特异度低,用胶体金法检测猪瘟抗体滴度存在一定程度的漏检率及误诊率,只能初步筛查猪瘟抗体.具有一定技术力量的县级兽医实验室使用ELISA法检测猪血样的猪瘟抗体滴度更为合适,对于胶体金法筛查阴性的猪血样,建议用ELISA法复检以防漏检.     

猪瘟胶体金免疫快速检测技术研究进展

猪瘟是由猪瘟病毒引起的一种严重危害养猪业的毁灭性传染病。胶体金免疫技术是一种新型免疫学检测技术,具有操作简便、快速、灵敏度高、特异性强、无需特殊仪器等优点,在猪瘟的快速诊断中得到了广泛应用,显示出了良好的应用前景。本文概述了胶体金免疫技术在猪瘟抗原及抗体快速检测上的应用研究进展,以期为猪瘟的有效防控提供参考。     

猪瘟胶体金免疫快速检测技术研究进展

猪瘟是由猪瘟病毒引起的一种严重危害养猪业的毁灭性传染病。胶体金免疫技术是一种新型免疫学检测技术,具有操作简便、快速、灵敏度高、特异性强、无需特殊仪器等优点,在猪瘟的快速诊断中得到了广泛应用,显示出了良好的应用前景。通过概述胶体金免疫技术在猪瘟抗原及抗体快速检测上的应用研究进展,对现状及发展前景作一简要综述,以期为猪瘟的有效防控提供参考。     

胶体金免疫技术在猪瘟诊断上的应用进展

胶体金免疫技术是一种新型免疫学检测技术。它具有简便、快速、特异性强、敏感性高、结果判断直观等优点。在猪瘟的快速诊断中得到了广泛应用,显示出了良好的应用前景。论文就胶体金免疫技术及其在猪瘟快速诊断上的应用现状及发展前景作一简要综述。     

胶体金免疫技术在猪瘟诊断上的应用进展

胶体金免疫技术是一种新型免疫学检测技术.它具有简便、快速、特异性强、敏感性高、结果判断直观等优点.在猪瘟的快速诊断中得到了广泛应用,显示出了良好的应用前景.论文就胶体金免疫技术及其在猪瘟快速诊断上的应用现状及发展前景作一简要综述.     

ELISA和胶体金法在猪瘟病毒检测中的应用

为探讨胶体金检测技术和ELISA在猪瘟病毒检测中的应用,通过对西藏林芝地区某县采集的92个疑似猪瘟样品进行免疫胶体金免疫层析法与ELISA法检测猪瘟抗体和抗原,比较两法检测结果的符合率。结果表明,猪瘟胶体金法抗原和抗体检测阳性符合率为100%,ELISA法检测的阳性符合率为95%以上。猪瘟的胶体金法抗原和抗体检测阳性符合率较高,同时该结果与ELISA的抗原和抗体检测阳性符合率高,说明使用猪瘟疫苗进行免疫在西藏林芝地区某县可以取得95%以上的免疫效果。这两种方法操作方便、快速,适合于临床快速检测和疫病普查中高通量样品的筛查。     

猪瘟病毒实验室检测技术

本文主要介绍猪瘟血清学实验室诊断技术应用,猪瘟病毒中和试验、胶体金免疫检测、猪瘟正向间接血凝试验和猪瘟琼脂扩散试验的特点、猪瘟常见的血清学实验室诊断技术以及存在的问题与不足,以便更好地适用于临床应用。     

猪瘟快速诊断金标试纸条的研制及应用

运用胶体金免疫层析技术,建立一种操作简单、特异性好、灵敏度高、适合临床诊断的检测猪瘟病毒的方法。通过采用柠檬酸三钠还原氯金酸制备胶体金,选择15nm胶体金标记兔抗猪瘟病毒抗体,组装免疫层析试纸条。用试纸条对猪瘟可疑病料进行检测,结果显示,用试纸条检测猪瘟病毒,15min左右即可显示结果,并与荧光抗体检测方法加以比较,结果表明用此种方法可以检测猪瘟病。     

陆地生态系统净初级生产力的时空动态模拟研究进展

陆地生态系统净初级生产力(Net Primary Productivity,NPP)研究是全球变化的核心内容之一,反映了植被每年通过光合作用所固定的碳总量。近年来将遥感数据引入到NPP的模型设计和估算中已成为了一种新的发展方向,它利用遥感获得的全覆盖数据,使区域及全球尺度的NPP估算成为可能。回顾了NPP研究历史,综合分析了气候相关统计模型、生态系统过程模型和光能利用率模型的优缺点;以CASA、C-FIX和BIOME-BGC这3种遥感参数模型为例,阐述和分析了该类模型的特点以及国内外的研究进展,提出了NPP模型存在的问题和未来的发展方向。     

Establishment and Application of Nested PCR Method for Detecting Mutation in Single Cell

Gene mutation detection in single cell is a new method used for DNA or RNA analysis based on single cell lysis products,the establishment of this technology will provide an easy and quick way for gene expression and mutation detection in single cell level.In this paper,pig 4-cell-stage parthenogenetic embryos microinjected with Cas9 mRNA and 2 target gRNA from pig SS gene were used as experimental material,and two pairs of nested primers were designed for nested PCR.Using this detection method,long fragment deletion in SS gene was detected.This method can minimize the occurrence of false negative and false positive results,which may play an important role in the pig gene mutation detection.     

应用巢式PCR法检测猪单个胚胎中的基因突变

单胚胎基因突变检测技术是以单个胚胎的裂解产物为模板进行DNA或RNA分析的方法,该技术的建立将为在单细胞水平进行基因表达和突变检测提供简便而快捷的方法。本研究设计了2对巢式引物,以显微注射了Cas9 mRNA和猪SS基因2个靶点的gRNA的四细胞期孤雌胚胎为试验材料,通过蛋白酶K对猪单个胚胎进行裂解后直接进行巢式PCR分型,并检测到猪胚胎中SS基因的删除突变。该方法可以最大限度减少假阴性和假阳性结果的出现,在猪基因突变检测中具有重要作用。     

Development of novel intracytoplasmic sperm injection and somatic cell nuclear transfer techniques for animal reproduction

Animal biotechnology has made new biological experiments possible and new discoveries are being made on an almost daily basis. Among these discoveries is a method for directly injecting a spermatozoa or somatic nucleus into an oocyte that has brought a revolution in the world of micromanipulators. Experiments that were unfeasible until now have become possible, and normal offspring can be generated from infertile cells, such as using dead sperm or a dead frozen body. In this review, I will introduce the progress of animal reproductive biotechnology, including our current research.     

桑树有丝分裂染色体观察新法探索实验——酸解去壁低渗法

取桑芽、幼叶经前处理后,用1N HCl酸解处理材料15分钟,再进行低渗滴片,制备桑有丝分裂染色本标本.经观察,用此法制备的染色体标本,同样可以达到酶解去壁低渗法的观察效果,而比酶解去壁低渗法极大的节约实验费用;与常规切片法、压片法相比,其染色体制备效果好,且操作程序更简捷.将该方法称作桑树酸解去壁低渗法.     

酸奶发酵剂复壮方法研究

为了更加有效地对衰退的发酵剂菌株进行复壮，本研究评价了一种结合连续传代、好氧与厌氧交替培养及分离纯化相结合的方法。用此方法对性能衰退的保加利亚乳杆菌（乳1#杆）及嗜热链球菌（乳1#球）进行复壮，得到了良好的效果。与原始菌株相比，复壮菌株的生长性能、产酸性能及产香能力都有了显著的提高。与传统复壮方法相比，此种方法工作量小、复壮效果好，适合用于现代乳品工业中发酵剂性能的保持。     

种猪场猪支原体肺炎（气喘病）控制与净经技术研究

在一个气喘病流行已有数年的种猪场，结合种猪选育，实施了以免疫、消毒、隔离、淘汰并加速更换种猪建立和新种猪群等为主要技术措施的猪气喘病控制和净化技术后，取得了显著效果，气喘病临床病猪已经少见，肺部有气喘病病变的猪也从试验初期的１０．９％下降至后期的３％左右，仔猪活率和生长速度显著提高。     

Differentiating between analytical and diagnostic performance evaluation with a focus on the method comparison study and identification of bias

Prior to introduction of a new method to the diagnostic laboratory, analytical performance must be validated to ensure operation within the manufacturer's specifications and/or within predetermined quality requirements. In addition, the new method may require diagnostic performance assessment to ensure it differentiates between diseased and nondiseased individuals as intended. These 2 phases of assessment, while complementary, are not equivalent and require a different set of experiments, statistical analyses, and interpretation. Studies of analytical performance typically include a method comparison experiment, the purpose of which is to identify bias (inaccuracy) of the “test” (or “index”) method (new method) relative to a “comparative method” (established method). Analysis of method comparison data is facilitated by commercial software programs that present the statistical significance of identified bias; however, the clinical relevance of any bias also should be considered. Studies of diagnostic performance should not be pursued until analytical performance is fully characterized and may not be required for well‐established tests or for those for which results are nonspecific (ie, not referable to a specific disease or condition). Diagnostic performance assessment may include assessment of sensitivity, specificity, predictive values, odds ratios, and/or likelihood ratios. The purpose of this review is to clarify differences between the assessment of analytical and diagnostic performance, and to explore the method comparison study and bias assessment from a perspective not addressed in prior veterinary articles.     

Improvement and validation of the method to determine neutral detergent fiber in feed

To improve the performance of the analytical method for neutral detergent fiber in feed with heat‐stable α‐amylase treatment (aNDFom), the process of adding heat‐stable α‐amylase, as well as other analytical conditions, were examined. In this new process, the starch in the samples was removed by adding amylase to neutral detergent (ND) solution twice, just after the start of heating and immediately after refluxing. We also examined the effects of the use of sodium sulfite, and drying and ashing conditions for aNDFom analysis by this modified amylase addition method. A collaborative study to validate this new method was carried out with 15 laboratories. These laboratories analyzed two samples, alfalfa pellet and dairy mixed feed, with blind duplicates. Ten laboratories used a conventional apparatus and five used a Fibertec^® type apparatus. There were no significant differences in aNDFom values between these two refluxing apparatuses. The aNDFom values in alfalfa pellet and dairy mixed feed were 388 g/kg and 145 g/kg, the coefficients of variation for the repeatability and reproducibility (CV_r and CV_R) were 1.3% and 2.9%, and the HorRat values were 0.8 and 1.1, respectively. This new method was validated with 5.8% uncertainty (k = 2) from the collaborative study.     

梯度条带PCR快速检测CSBV方法的建立

通过与传统RT-PCR检测方法比较,建立了一种新的快速、准确鉴定中华蜜蜂囊状幼虫病病毒(CSBV)的方法,为中华蜜蜂囊状幼虫病的诊断与防治提供了重要的手段。对陕南、陕北、关中三地的健康蜂及CSBV感染蜂分别进行传统RT-PCR和梯度条带PCR两种方法的检测,通过琼脂糖凝胶电泳及测序结果对两种方法进行分析比较。结果发现传统RT-PCR和梯度条带PCR方法对陕西三地的感染病毒蜂鉴定结果一致,而梯度条带PCR方法相对更快速和直观。与传统RT-PCR鉴定方法比较,该新方法能够在电泳检测阶段通过DNA片段的梯度次序即确定是否存在病毒,能够省去PCR产物测序步骤,缩短了对该病毒的鉴定周期,对及时发现和鉴定病蜂、采取预防措施提供了重要的技术手段。因此,梯度条带PCR快速鉴定方法不仅为CSBV的检测提供了一种简单、快速、直观的方法,对类似动物病毒的快速鉴定也提供了很好的借鉴。