接种丛枝菌根真菌对柑橘不同钙剂吸收及苗木生长效应的影响

以柑橘苗为试材,分别对未接种植株、接种摩西球囊霉和幼套球囊霉的植株外施5nmol/L硝酸钙和醋酸钙,比较了三种处理下植株茎粗、株高、侵染率、根系活力和植株根系、叶片中钙和氮含量。结果表明,接种丛植菌根真菌促进植株的生长,其根系和叶片中钙元素和氮元素含量均比未接种的植株的高;施用硝酸钙的植株根系和叶片中钙、氮元素含量比施用醋酸钙的植株高。     

微波消解-石墨炉原子吸收光谱法测定醋酸地塞米松中的微量硒

采用微波制样技术对样品进行消解,减少了消化过程中硒的损失,利用石墨炉原子吸收光谱法对醋酸地塞米松中微量硒进行测定.以4 mg/mL Pd(NO3)2作为基体改进剂,灰化温度为950 ℃,原子化温度为2 100 ℃时,经氘灯校正背景,测定硒含量,回收率在89.24%～112.37% 之间,方法的相对标准偏差为7.42%,检出限为0.53 ng/mL.该法具有简便、快速、灵敏、稳定、准确等优点,适用于醋酸地塞米松中微量硒的分析测定.     

脏器活性添加剂对山羊血清蛋白和细胞免疫功能的影响

本实验用我们课题组从动物脏器提取的活性添加剂配合精饲料饲喂山羊,将山羊分为实验组和对照组,３０天后采血。用醋酸纤维薄膜电泳法测定血清蛋白组分,以α－乙酸萘酯酶染色法测定Ｔ淋巴细胞的活性,分析山羊的细胞免疫水平。结果表明：活性添加剂对山羊血清蛋白组分没有明显影响,而对山羊的细胞免疫活性却有较为明显的增强作用。此结果同我们以前所做有关活性添加剂的实验相一致。     

H9亚型禽流感病毒环介导等温扩增检测方法的建立与荧光指示剂的应用

利用反转录环介导等温核酸扩增技术(RT-LAMP),建立了一种特异、灵敏、便捷的H9亚型禽流感病毒(H9subtype of avian influenza virus,H9-AIV)的检测方法。该方法使用了对应于H9亚型禽流感病毒血凝素(hemagglutinin HA)基因的8个不同区域的6条特异引物,在63℃的等温条件下反应,最低可检测到103拷贝的目的基因重组质粒片段,较RT-PCR方法敏感10倍。通过对15种H亚型禽流感病毒、新城疫病毒(Newcastle disease virus,NDV)、传染性支气管炎病毒(Infectious bronchitis virus,IBV)的检测表明,该方法具有良好的特异性。在反应体系中使用钙黄绿素与Mn2+的混合溶液作为荧光指示剂可以用于RT-LAMP结果判定,并且其判断结果与浊度判断结果一致。对109份禽咽喉拭子及泄殖腔拭子临床样品进行检测,RT-LAMP与RT-PCR检出阳性样本数分别为61份和46份,表明RT-LAMP方法阳性检出率高于RT-PCR。     

乙酰甘草次酸甲酯的合成与表征

以甘草酸为原料,以杂多酸作为催化剂,采用水热法合成了乙酰甘草次酸甲酯;采用元素分析、薄层层析、质谱和红外光谱等方法表征了所合成的产物。     

IMAGING DIAGNOSIS—ENDOMETRIAL MINERALIZATION IN A DOG

A 9‐year‐old intact female mixed breed dog was presented for mammary gland tumor surgery, and preoperative radiographs showed a tubular soft tissue opacity mass with multifocal mineralization in the caudoventral abdominal cavity. Subsequent ultrasonography demonstrated uterine dilation with echogenic fluid and endometrial acoustic shadowing consistent with mineralization. Resection of mammary gland tumors and ovariohysterectomy were performed. Pyometra was diagnosed on cytologic examination of uterine fluid. Histopathology of the uterine tissue confirmed a diagnosis of cystic endometrial hyperplasia with uterine mineralization.     

A comparison of the mitogenic effects of a phorbol ester on lymphocytes from bovine spleen,lymph node and peripheral bloodComparaison des effets mitogenes d'un ester de phorbol sur des lymphocytes bovins de rate,de ganglions lymphatiques et de sang peripherique

A comparison of the mitogenic effects of a phorbol ester on lymphocytes from bovine spleen, lymph node and peripheral blood.Bovine lymphocytes from three tissues, lymph node, spleen and peripheral blood were compared for their mitogenic responses to 12-O-tetraecanoylphorbol-13-acetate (TPA), a phorbol ester tumor promoter. TPA alone was found to be either not mitogenic or caused only a weak response when compared with the mitogenic lectin phytohemagglutinin (PHA). Of the three lymphocyte preparations, blood cells showed the greatest proliferative response to TPA. However, all three, lymph node, blood and spleen cells, showed a co-mitogenic response to TPA. That is, TPA synergistically enhanced DNA synthesis in cells stimulated with a suboptimal concentration of PHA.     

爱格丽干白葡萄酒发酵过程中典型乙酸酯的生成动力学

为建立干白葡萄酒中重要乙酸酯的生成动力学模型,以爱格丽葡萄为原料,接种酿酒酵母,按常规工艺酿造干白葡萄酒。发酵过程中监测乙醇和乙酸含量变化,并定时取样进行目标香气物质(异戊醇、苯乙醇、乙酸乙酯、乙酸异戊酯和乙酸苯乙酯)的SPME-GC-MS分析,建立目标香气物质的香气活性值变化曲线,同时从经典化学反应动力学角度构建目标香气物质的生成动力学模型。研究结果表明,乙酸异戊酯在发酵过程中表现出香气活性,乙酸苯乙酯仅在最大检出量时表现香气活性,乙酸乙酯检出量一直低于嗅觉阈值。目标香气物质从开始生成至达到最大生成量的含量变化均符合零级动力学模型(R20.95,P0.001)。模型揭示出,乙酸乙酯的生成与乙醇和乙酸具有同时性,乙酸异戊酯和乙酸苯乙酯的生成分别相对于异戊醇和苯乙醇有延滞效应。结合零级动力学模型特征,为增强葡萄酒的花香和果香特征,可尝试在爱格丽葡萄汁发酵旺盛的香气物质半生成期,调控促进乙酸乙酯和乙酸苯乙酯生成。     

含硫香料化合物3-甲硫基-1-己醇及其乙酸酯的合成研究

本文以E-2-己烯醛为原料研究了3-甲硫基己醇及3-甲硫基乙酸己酯的合成方法。首先甲硫醇钠与E-2-己烯醛发生1,4-共轭加成得到3-甲硫基己醛,产率87%;然后用硼氢化钠还原得到3-甲硫基己醇,产率92%左右;3-甲硫基己醇在乙酸钠的催化下与乙酸酐反应,得到3-甲硫基乙酸己酯,产率约95%。产物结构经过GC/MS和1HNMR谱图进行了确认。     

Dietary vitamin E could improve growth performance,lipid peroxidation and non‐specific immune responses for juvenile cobia (Rachycentron canadum)

An 8‐week feeding trial was conducted to establish the dietary vitamin E requirement of juvenile cobia. The basal diet was supplemented with 10, 20, 30, 40, 60, 120 mg vitamin E kg^?1 as all‐rac‐α‐tocopheryl acetate. The results indicated that fish fed the diets supplemented vitamin E had significantly higher specific growth rate, protein efficiency ratio, feed efficiency and survival rate than those fed the basal diet. It was further observed that vitamin E concentrations in liver increased significantly when the dietary vitamin E level increased from 13.2 to 124 mg kg^?1. Fish fed the basal diet had significantly higher thiobarbituric acid‐reactive substances concentrations in liver than those fed the diets supplemented vitamin E. Fish fed the diets supplemented with 45.7 and 61.2 mg kg^?1 vitamin E had significantly higher red blood cell and haemoglobin than those fed the basal diet, while fish fed the diets supplemented with 61.2 and 124 mg kg^?1 vitamin E had higher immunoglobulin concentration than those fish fed the basal diet. Lysozyme and superoxide dismutase were significantly influenced by the dietary vitamin E level. The dietary vitamin E requirement of juvenile cobia was established based on second‐order polynomial regression of weight gain and lysozyme to be 78 or 111 mg all‐rac‐α‐tocopheryl acetate kg^?1 diet, respectively.