免疫胶体金法检测磺胺甲噁唑残留的研究

应用胶体金免疫层析技术（GICA）进行磺胺甲嗯唑（SMZ）的残留检测研究。制备抗磺胺甲嗯唑多克隆抗体，并采用柠檬酸三钠法制备20nm胶体金颗粒。胶体金标记多抗后喷涂到玻璃纤维膜上，特异性抗原（SMZ-OVA）以线状包被在硝酸纤维素膜上，制成快速检测试纸条。滴加检测溶液后，若呈现一条红色条带则为阴性，无红色条带则为阳性。该方法对SMZ标准溶液的灵敏度达到50ng／mL，试纸条显色结果清晰，反应灵敏，整个检测反应在5～10min内完成，稳定性及重复性良好。     

悬挂式卷管灌溉机的设计与研制

作为农村保有量最多的小四轮拖拉机的一种配套灌溉机具,从结构参数的设计出发,提出了悬挂式卷管灌溉机的卷盘结构、动力系统、灌水车及所匹配水泵参数的确定方法。     

混凝土车辆搅拌筒装载量与驱动功率的精确计算

为确定混凝土搅拌筒容积与驱动功率,详细分析了搅拌筒的几何结构,建立了搅拌筒容积的精确计算模型,基于该模型推导了任意物料平面的整体质心以及此时搅拌筒驱动功率的表达式,通过工程车辆实际装载量与模拟计算数值的对比,结果表明该数学模型有较高的精度,该程序化计算模型可应用于相关设计计算中。     

应用Kappa检验比较猪蓝耳病ELISA抗体检测试剂盒

[目的]比较两个猪繁殖与呼吸综合征病毒（PRRSV）抗体酶联免疫吸附试验（ ELISA）检测试剂盒结果的一致性。[方法]对390份猪血清进行PRRSV抗体ELISA检测,应用Kappa检验比较两种试剂盒检测结果的一致性并进行分析。[结果]两种试剂盒联合检测出250份PRRSV抗体阳性和70份阴性,阳性一致性为80.65%,阴性一致性为87.50%,符合率82.1%,结果一致性为中度一致（ Kappa值=0.552）。[结论]2种方法检测结果一致性较好,建议根据实际需要选择PRRSV抗体检测试剂盒。     

抗链霉素杂交瘤细胞株的建立与竞争ELISA试剂盒的研制

制备牛血清白蛋白-链霉素(SM-BSA)免疫Balb／c小鼠,用细胞融合技术制备抗链霉索单克隆抗体(SM mAb)杂交瘤细胞,体内诱生腹水法制备SM mAb。依据竞争ELISA原理,应用SM mAb研制SM快速ELISA检测试剂盒(SM-Kit),并对其灵敏度、准确度、特异性、基质效应性等进行检测。结果表明,SM-Kit标准曲线呈典型的S型,线性检测范围为1～128μg／L,相关系数R2=0．925 1,灵敏度为0．45μg／L,半数抑制浓度(IC50)为7．76μg／L,检测限为1μg／L;奶样、猪尿样的平均添加回收率分别为104．45％和84．1％;SM-Kit与双氢链霉素的交叉反应率(CR)为104．16％,与其他抗生素类药物的CR<0．001％;基质对SM-Kit的检测结果影响不大。可见SM-Kit具有快速、敏感、特异、简便等特点,适合于SM残留的快速检测,具有较高的推广应用价值。     

关于增加农民收入问题的思考

增加农民收入,是全面建设小康社会的重大任务,其意义不仅仅在于强农富民. 近年来农民收入增长缓慢是多种因素综合作用的结果,其主导因素是"三个矛盾运动"引发的"两个相对过剩"和"一个不适应性". 从根本上解决农民增收困难的问题,不能仅仅局限在农业内部,而必须有一套新思路,积极稳妥地推进"六项制度改革",加大财政支持力度,提升"三农"的综合实力和农业的竞争力.     

Precursor‐targeted immune‐mediated anemia in a dog with a stage IV mast cell tumor and bone marrow infiltration

A 12‐year‐old spayed female Shiba Inu dog was referred to our hospital for a suspected mast cell tumor (MCT) of the bone marrow (BM). Laboratory abnormalities included severe nonregenerative anemia (packed cell volume or PCV: 12.5%; reference interval (RI): 37.3‐61.7%; reticulocytes: 35.1 × 10³/µL; RI: 10‐110 × 10³/µL), and a few mast cells were visualized in the blood smear examination. The BM was hypercellular with hematopoietic cells, a decreased myeloid:erythroid (M:E) ratio (0.77; RI, 0.9‐1.8), and no dysplastic hematopoietic cells. Mast cells accounted for 11.5% of the total nucleated BM cells. Neoplastic mast cells and histiocytes phagocytizing erythroid progenitor cells were occasionally noted. The dog was diagnosed with precursor‐targeted immune‐mediated anemia (PIMA) concurrent and a stage IV MCT infiltrating the BM. Multimodal treatment included toceranib, imatinib, vinblastine, lomustine (CCNU), prednisolone, cyclosporine, mycophenolate mofetil, and a blood transfusion. The dog died due to MCT progression lasting 139 days after the initial BM examination. To the best of our knowledge, this is the first report of a dog presenting with PIMA and a stage IV MCT infiltrating the BM.     

苗族鼓舞及其文化特征

苗族鼓舞是苗族文化一个侧面的反映,具有典型的艺术模式和文化特征。苗族鼓舞与苗族其他艺术形式一样,构成了独特的苗族文化生态群落。在苗族历史发展过程中,原始的“巫”文化与民族艺术经过了多层面、多方位的融合,苗族鼓舞成为了反映苗族文化内容与特征的主要形式。     

Screening methods and identification of QTLs associated with late maturity α-amylase in wheat

The synthesis of high levels of germination-type (high pI isozymes) α-amylase was induced in wheat genotypes prone to late maturityα-amylase (LMA) following the exposure of detached tillers to cool temperature during grain development. The detached tiller method was successfully applied to a range of genotypes and to a doubled haploid (DH) population derived from the cross Cranbrook (LMA genotype) × Halberd (low amylase). The number of grains in ripe, treated tillers that contained high pI α-amylase isozymes was measured using an ELISA antibody kit highly specific for high pI isozymes. Quantitative trait loci (QTL) controlling the expression of LMA in wheat were detected in DH population Cranbrook × Halberd. The DH population and parents were sown in 2 replicated sowings at the same location with sowing times differing by 2 weeks. QTL analyses were conducted separately for each sowing, but results from both sowings were consistent and indicated a highly significant (it p > 0.01) QTL on the long arm of chromosome7B, with Cranbrook contributing the higher value allele. A second QTL with less significant effect was found on the long arm of chromosome 3B, on the basis of data from the first sowing. This revised version was published online in August 2006 with corrections to the Cover Date.     

副猪嗜血杆菌Apd-ELISA抗体检测试剂盒的制备和初步应用

旨在对副猪嗜血杆菌（Haemophilus parasuis,HPS）的黏附素蛋白（autotransporter passenger domain,Apd）ELISA抗体检测方法进行参数优化、临界值确定和应用评价,获得性能稳定的副猪嗜血杆菌病抗体检测试剂盒。首先通过猪的免疫攻毒试验获得HPS阴、阳性对照血清,优化Apd-ELISA的反应参数;然后用背景确认的阴、阳性血清确定其临界值,并对封闭液及酶标板的包装方式进行选择;最后用Apd-ELISA试剂盒对临床样品进行检测并与荷兰Biocheck的OppA-ELISA试剂盒进行比较。结果表明,抗原包被质量浓度为0.5 μg·mL^-1、被检血清以1：200倍稀释后反应45 min以及二抗稀释度为1：15 000时,Apd-ELISA的反应背景下降,区分度提高。根据背景确认的27份阳性和40份阴性血清的OD_{630 nm}值以及临界值计算公式（S-N）/（P-N）,得到Apd-ELISA的阴阳性临界值是0.33。证实用封闭液K封闭和真空包装的酶标板可以在50℃保存4 d（相当于在4℃保存22个月）。用Apd-ELISA试剂盒检测1 179份临床血清,表明母猪、后备和育肥猪以及仔猪的HPS血清阳性率分别为83.76%、61.09%和27.48%。与荷兰的Biocheck试剂盒进行比较,发现Apd-ELISA与Biocheck试剂盒（OppA-ELISA）对HPS临床阴性血清和疫苗免疫血清检测的符合率为100%,对HPS临床阳性血清的符合率仅为4.76%（6/126）。然而,Apd-ELISA与OppA Western blot的阳性符合率可达到73.02%（92/126）。本研究获得了能有效区分HPS阴、阳性血清和稳定保存的Apd-ELISA抗体检测试剂盒,可用于HPS灭活疫苗免疫后的抗体检测和副猪嗜血杆菌病的血清抗体检测。