Effect of intravenous mannitol upon the resistive index in complete unilateral renal obstruction in dogs

Some studies have shown that relative to baseline, the renal resistive index (RI) remains unchanged in nonobstructed kidneys and increases in obstructed kidneys after administration of furosemide. To our knowledge, the effect of mannitol administration on the renal RI of dogs has not been reported. We evaluated the renal RI in 16 kidneys in 8 young adult dogs after administration of mannitol. The mean RI decreased significantly from baseline (P < .01). Additionally, left complete ureteral obstruction wasinduced in 5 dogs. Evaluation by Doppler ultrasonography was performed for 5 days. On the 5th day, Doppler examination was repeated at 30 and 60 minutes after administration of mannitol to obstructed dogs. After induction of left ureteral obstruction, the RI of the left kidney increased significantly over 5 consecutive days. Administration of mannitol decreased the RI in the nonobstructed contralateral kidneys, and thus the RI difference between obstructed and nonobstructed kidneys was increased above normal (P < .001). In conclusion, administration of mannitol may be useful as another diuretic agent to identify unilateral ureteral obstruction on Doppler sonographic examination.     

2016—2020年宁夏彭阳县牛羊口蹄疫及小反刍兽疫抗体监测数据分析

为了解彭阳县牛羊口蹄疫和小反刍兽疫免疫抗体水平,收集彭阳县2016—2019年的牛羊抗体春秋集中监测数据和2020年春季牛羊抗体监测数据,进行时间、空间和群间分布描述。结果显示：2016春季牛O型和A型口蹄疫及羊小反刍兽疫抗体水平,2018年春季牛羊O型和A型口蹄疫抗体水平及2019年春季羊小反刍兽疫抗体水平较低,其他时间集中监测的抗体水平均超过70%;近5年来彭阳县牛口蹄疫抗体水平总体呈现上升趋势,羊口蹄疫和小反刍兽疫免疫抗体水平基本保持平稳;O型口蹄疫抗体水平整体上高于A型（P＜0.001）;牛规模场和牛散养户间的口蹄疫抗体水平没有差异（P＞0.050）,而羊规模场和羊散养户间的口蹄疫和小反刍兽疫抗体水平差异显著（P＜0.010）。结果表明,彭阳县牛羊口蹄疫和小反刍兽疫免疫效果整体较好,但仍有部分期间的免疫效果较差。建议加强对动物防疫社会化服务机构的监管,持续做好基层动物防疫人员的免疫技术培训,逐步提高牛羊规模化养殖水平。本研究掌握了彭阳县近5年来的牛羊口蹄疫和小反刍兽疫的免疫状况,找出了存在的问题,提出了今后的工作重点,为该地做好重大动物疫病防控,保障畜牧业健康发展提供了参考。     

高浓度城市污水处理正交试验研究

针对新疆石河子市城市污水CODcr高于1000mg／L的特点，采用SBR工艺进行处理试验，并用正交试验的方法对最佳工艺条件进行了探讨。试验表明，该工艺对高浓度城市污水有较好的处理效果。通过控制运行条件，可使出水各项指标分别满足污水综合排放标准和农业灌溉的要求。     

4种高原乡土禾草的抗旱生理比较

采用盆栽法对梭罗草（Roegneria thoroldiana）、草地早熟禾（Poa pratensis）、垂穗披碱草（Elymus nutans）和中华羊茅（Festuca sinensis）4种高原乡土禾本科牧草幼苗的抗旱性进行了比较。结果表明,一定程度的干旱胁迫后,4种禾草的游离脯氨酸含量、可溶性蛋白含量、可溶性糖含量、过氧化氢酶活性、过氧化物酶活性等均有所增加,且叶绿素分解、细胞膜透性增大、电解质外渗率增加,牧草组织细胞受到伤害。不同牧草在干旱胁迫下生理生化指标的变化不同,综合各项指标,运用隶属函数分析表明,4种禾草抗旱性强弱的排序为梭罗草>草地早熟禾>垂穗披碱草>中华羊茅。     

通过农杆菌介导法将口蹄疫结构蛋白全长基因P1导入大豆的研究

本研究以大豆体细胞胚为受体。用农杆菌介导法将口蹄疫病毒结构蛋白全长基因P1导入大豆基因组中．获得了抗性植株。经GUS染色、PCR及PCR-southern杂交等分子检测。证明目的基因已导入并整合到大豆基因组中。为利用大豆作为生物反应器生产口蹄疫新型口服疫苗奠定了基础。     

Response of potatoes to different nutrient solution management in a closed hydroponic system

Ion control of nutrient solutions to control nitrogen (N), phosphorus (P), and potassium (K) was developed for Superior (medium-to-early maturing) and Atlantic (mid-late) potato cultivars grown in closed hydroponic systems in which solutions were replenished and recirculated. Results were compared with conventional nutrient solution management strategies. In the “solution replacement” treatment, nutrient solutions were completely replaced each week. In the “electrical conductivity (EC) control” treatment, water use by potato plants was compensated by adding ground water to achieve the original volume (water replenishment) and the diluted EC of the solution was adjusted to the target levels using stock solution. In “ion control” treatment, ammonium dihydrogen phosphate (NH₄H₂PO₄) and potassium nitrate (KNO₃) were added to the EC-controlled nutrient solution. The amounts increased with plant age in both cultivars. The concentrations of nitrate (NO₃), P, and K in the ion control nutrient solution could be maintained at target levels. In water replenishment, recycling of nutrient solution resulted in a progressive decrease in EC and an increase in pH. Root activity increased by 93% and 59% in the Superior and Atlantic cultivars, respectively, compared with the nutrient solution replacement. These changes decreased photosynthesis, plant growth, water use, and thus tuber growth in the Superior cultivar. Decreased growth of shoots and tubers occurred without affecting photosynthesis in the Atlantic cultivar. Although there were no significant differences in root activity, photosynthesis, or plant growth between the ion control treatment and the EC control treatment, increased tuber growth was observed in the ion control treatment, possibly as a result of the constant supply of nutrients. High tuber growth and the capability to maintain solution nutrient concentration in the ion control treatment are highly desirable for closed hydroponic systems.     

Turn Red Plum Cultivation and Management Techniques

转紫红是陕西省米脂地区的一个乡土树种,特别适应本地的自然环境,而且栽培价值高,除成片大面积栽培外,也适于群众家前屋后散生栽培.     

秸秆沼气化发电技术生命周期评估及经济分析

该研究基于生命周期评价方法和时间价值动态分析方法对沼气直燃发电技术、沼气燃料电池发电技术作可行性分析,并与燃煤发电技术相比,旨在综合评估三种发电技术在环境和经济上的特点,为发电方式选择提供参考依据。结果表明：沼气燃料电池发电技术环境效益最佳,总环境影响负荷为8.55×10-4,沼气直燃发电技术总环境影响负荷为2.15×10-2,两者相较于燃煤发电（2.97×10-1）的减排量分别为99.71%和92.76%。在经济上,沼气直燃发电技术的投资回收期最短（12.03 a）,运营期净现值可达1 361 246 Yuan/MW;其次是燃煤发电技术（14.5 a）,净现值为423 933 Yuan/MW;沼气燃料电池发电技术动态回收期>20 a且未实现盈余。说明沼气直燃发电技术在近期内将仍是替代燃煤发电的最佳发电技术之一。     

牛AR基因5′UTR SNP分析及与精液品质关系

采用PCR-SSCP方法对种公牛群体雄激素受体(AR)基因5′非翻译区(5′UTR)多态性进行检测。结果表明:AR基因5′UTR含有多态性位点;测序结果显示5′UTR的-1575处存在T→G碱基突变;用最小二乘方法对该基因型与生产性状相关分析显示遗传多态性与精子密度性状呈显著相关,AA型显著高于AB型(P=0.025),对其他性状的影响差异不显著。试验为研究种公牛体内AR基因的生物学作用奠定了基础,为肉用种公牛的早期选种选育提供了候选基因和分子标记。