高分散性镍纳米粒子的制备

在1,2丙二醇-水体系中,以PdCl2为成核剂,NiSO.46H2O和无水Na2CO3反应生成的NiCO.32N(iOH).22H2O前驱体,回流2.5 h后,加入还原剂水合肼,反应30 min后制得纳米镍,其分散好.所制备的纳米镍粉用X射线衍射分析法、透射电镜进行了表征,发现前躯体在1,2丙二醇-水体系中回流反应,有利于最终产物提高分散度.     

酸奶中发酵剂的益生作用

酸奶中的发酵剂,主要由双歧杆菌、乳酸杆菌等益生菌组成,其益生菌对人体具有重要的保健作用.     

乳制品中蛋白质含量的测定

采用凯氏定氮法和光谱法分析测定完达山奶粉系列中蛋白质的含量.对传统的凯氏定氮法的催化剂进行了改进,加快了消化速度,缩短了分析时间.光谱分析方法的回收率为94.22%~101.00%,变异系数为0.44%.对非高脂肪含量奶粉,光谱法和凯氏定氮法的测定结果无显著性差异(P>0.05).     

饲喂微贮啤酒糟对黑白花奶牛产乳性能的影响

本文选用年龄、体重、胎次基本相同的 40头黑白花奶牛 ,随机分为试验组A和对照组B ,A组在日粮中添加微贮啤酒糟 8公斤 ,B组在日粮中添加 8公斤鲜啤酒糟。经过 30天的试验 ,结果表明 :试验组A比对照组B奶牛的日均产乳量提高了 4.43% ,差异显著 ,乳脂率提高了 2 .34%。     

化学发光法测定牛奶中的微量碘

利用甲醛-I--高锰酸钾化学发光体系,建立了化学发光法测定牛奶中微量碘的新方法。讨论了反应物浓度、酸度、干扰离子等因素对测定结果的影响。实验结果表明:最低检出限为2.6×10-9g/mL,化学发光强度与碘浓度在1.2×10-7~4.8×10-6g/mL范围内具有良好的线性关系,回收率为94.8%~104.3%,相对标准偏差为2.6%(n=5)。     

陌生人社会的出路——三鹿毒奶粉事件引发的法律思考

本文从“陌生人社会”这一社会学概念入手,直面三鹿毒奶粉事件折射出的法律问题。通过系统比较陌生人社会和传统熟人社会之间的差别,笔者认为,替代“个人信任”的“制度信任”呼之欲出。人们对于规则的强烈渴求,使得法治的重要意义再次凸现。唯有法治才能在社会中建立起普遍有效的制度信任机制,以成功实现从熟悉人社会向陌生人社会的转型,避免三鹿毒奶粉类似事件的重演。     

应用多元回归预测奶牛产奶量

应用多元回归方法,通过对奶牛第一、第二胎产乳量预测总产乳量（１～６胎）,有利于奶牛早期选种,在奶牛选育中有一定指导意义。     

Development of a class-specific polyclonal antibody-based indirect competitive ELISA for detecting fluoroquinolone residues in milk

Modified 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) method was employed to synthesize the artificial antigen of norfloxacin (NOR), and New Zealand rabbits were used to produce anti-NOR polyclonal antibody (pAb). Based on the checkerboard titration, an indirect competitive enzyme-linked immunosorbent assay (icELISA) standard curve was established. This assay was sensitive and had a working range from 0.12 to 68.40 ng/ml, with the half maximal inhibitory concentration (IC₅₀) and limit of detection (LOD) values of 2.7 ng/ml and 0.06 ng/ml, respectively. The produced pAb exhibited high cross-reactivity to fluoroquinolones (FQs) tested, and the IC₅₀ values to enoxacin, ciprofloxacin, and pefloxacin were 3.1, 3.4, and 4.1 ng/ml, respectively. It also indicated that the concentrations of NaOH and methanol in assay buffer should not be higher than 10% and 30%. When spiked in milk at 5, 20, and 50 ng/ml, the recoveries for NOR, enoxacin, ciprofloxacin, and pefloxacin ranged 90.5%–98.0%, 84.0%–95.2%, 94.0%–106.0%, and 89.5%–100.0%, respectively. The results suggest that this class-specific pAb-based icELISA could be utilized for the primary screening of FQ residues in animal-original products.     

安徽荷斯坦牛泌乳量遗传力的估计

本研究采用女母相关法和公畜内半同胞相关法估计安徽荷斯坦牛泌乳量的遗传力,前者结果为0.2478(淮南)及0.2426(合肥);后者为0.2560(淮南)及0.2544(合肥).估计安徽荷斯坦牛群体泌乳量的遗传力在0.25左右,仍属于中等遗传力,对泌乳量进行表型选择可以获得一定的效果.     

Agglomeration Control of Ultrafine Y_2O_3-ZrO_2 and (MgO, Y_2O_3)-ZrO_2 Powders Synthesized by Coprecipitation Process

TheadventofstrongandtoughZrO2 basedce ramicshasgeneratedconsiderablescientificandtech nologicalinterestinthisclassofstructuralceram ics[1—3]. Nowfine grainedsinteredceramicscanbeproducedusingcommerciallyavailableultrafinepow ders,whichcanbesinteredtofulldensityatrelativelylowtemperatures. High qualityZrO2 powderisvitalforthesuccessfuldevelopmentofadvancedZrO2 ce ramics. Severalwetchemicalmethodshavebeende velopedforpreparationofsuchhigh purity, homoge neousandsinterableceramicspowders,…