ULTRASONOGRAPHIC FEATURES OF PYONEPHROSIS IN DOGS

Pyonephrosis refers an infected hydronephrotic kidney which arise from pyelonephritis followed by exudate accumulation in a dilated renal pelvis or hydronephrosis followed by ascending infection. Pyonephrosis may cause serious systemic complications, making prompt and reliable diagnosis critical. Clinical and ultrasonographic findings are used for the diagnosis of pyonephrosis in humans, but these findings have not been investigated in dogs. We reviewed ultrasonographic features in pyonephrosis in 18 dogs. Ten dogs with hydronephrosis were also evaluated to compare with the pyonephrosis patients. In most dogs with pyonephrosis, hyperechoic contents completely filled the dilated renal pelvis (n=8) or a fluid‐debris level was observed (n=8). Hyperechoic contents were dispersed in renal pelvis in only two of the 18 dogs. Hyperechoic, edematous mesentery, and peritoneal and retroperitoneal effusion, which represented peritoneal and retroperitoneal inflammation, were observed in the perinephric region in 11 dogs. Compared with pyonephrosis, and as expected, hydronephrosis was characterized by anechoic contents within the urine‐filled collecting system and there were no definitive findings to suspect peritonitis. Thus, there is a distinct difference in the sonographic appearance of pyonephrosis vs. hydronephrosis in dogs.     

基于ADAMS/VIEW汽车前悬架的建模及仿真

针对某轻型轿车的双横臂独立前悬架系统,在ADAMS/VIEW中建立了其虚拟模型,为反映车辆的真实行驶工况,对车轮测试平台创建了随机激励。通过仿真分析,揭示了运动特性参数在悬架运动过程中的变化规律,研究分析主销角随车轮上下跳动时的变化规律,评价悬架数据合理性。本项研究为虚拟样机技术在新产品开发中的应用提供了有效方法。     

禽脑脊髓炎病鸡脑中白细胞介素-1βmRNA表达水平的研究

用地高辛随机引物法标记白细胞介素-1β（Interleukin-1β,IL-1β）cDNA,制备双链cDNA探针,用该探针对20、25日龄禽脑脊髓炎攻毒病鸡扣正常鸡的脑组织中IL-1βmRNA表达水平进行原位杂交检测。结果显示攻毒鸡脑组织中IL-1βmRNA表达水平高于正常对照鸡,本研究为进一步研究禽脑脊髓的发病机理和诊断禽脑脊髓奠定基础。     

膨胀石墨对甲基橙废水吸附脱色的研究

本研究以利用酸洗技术制备的膨胀石墨为吸附剂,以浓度为100 mg/L的甲基橙溶液为模拟废水进行吸附脱色。试验主要从膨胀石墨的膨胀容积、膨胀石墨的用量以及脱色时间三个影响因素对膨胀石墨的吸附脱色性能进行讨论,通过多因素正交试验确定室温条件下的最佳脱色工艺条件为:25 mL模拟废水中加入0.25 g膨胀容积为350 mL/g的膨胀石墨,匀速振荡1.5 h。试验脱色时间短,且脱色效果显著,脱色率为99.99%。     

饲料中添加外源核苷酸对动物生长的影响

核苷酸作为一种无毒无害无残留的新型饲料添加剂,对动物生长发育和免疫功能等具有重要作用,在动物营养方面有很大的发展前途。近年来国内外学者对核苷酸的研究逐渐增多,本文综述了添加外源核苷酸对动物肠道功能的影响,进而对动物生长的影响。     

Aluminum tolerance associated with enhancement of plasma membrane H+-ATPase in the root apex of soybean

Seventeen soybean cultivars were screened to discern differences in aluminum (Al) sensitivity. The Sowon (Al-tolerant) and Poongsan (Al-sensitive) cultivars were selected for further study by simple growth measurement. Aluminum-induced root growth inhibition was significantly higher in the Poongsan cultivar than in the Sowon cultivar, although the differences depended on the Al concentration (0, 25, 50, 75 or 100 μmol L^–1) and the amount of exposure (0, 3, 6, 12 or 24 h). Damage occurred preferentially in the root apex. High-sensitivity growth measurements using India ink implicated the central elongation zone located 2–3 mm from the root apex. The Al content was lower 0–5 mm from the root apices in the Sowon cultivar than in the apices of the Poongsan cultivar when exposed to 50 μmol L^–1 Al for 12 h. Furthermore, the citric acid exudation rate was more than twofold higher in the Sowon cultivar. Protein production of plasma membrane (PM) H⁺-ATPase from the root apices (0–5 mm) was upregulated in the presence of Al for 24 h in both cultivars. This activity, however, decreased in both cultivars treated with Al and the Poongsan cultivar was more severely affected. We propose that Al-induced growth inhibition is correlated with changes in PM H⁺-ATPase activity, which is linked to the exudation of citric acid in the root apex.     

87份辽宁省主要玉米自交系SSR标记杂种优势群分析

利用SSR标记研究了87份辽宁省应用的主要玉米自交系的遗传多样性及类群划分。用102对扩增带型稳定的引物,从供试材料中检测出496个等位基因变异,每对引物检测等位基因2～9个,平均4.86个,平均多态性信息量0.56。用UPGMA方法将87份自交系划分为6个类群。深入分析了辽宁省玉米生产中杂种优势群和杂种优势模式的应用。     

播期密度对不同小麦品种群体茎数及产量的影响

参照四水平五因素正交L16(45)设计,研究品种、播期与密度对小麦总茎数和产量及产量构成因素的影响。结果表明,冬前,密度对小麦基本苗影响最大,播期对分蘖数和总茎数影响最大;春季,品种对单株茎数、总茎数和成穗数影响最大。品种对产量三要素影响显著,播期对穗数和千粒质量影响显著,对穗粒数影响不显著,密度对千粒质量影响显著,对穗数和穗粒数影响均不显著。播期对小麦产量影响最大,其次为品种,密度影响最小。适宜的播期在10月4日至10月10日,随着播期后移,小麦产量明显下降,中麦895是本试验中获得高产的最优品种。合理的种植密度为210万～270万/hm2,小麦处于最佳品种、播期、密度组合时,小麦冬前、春季群体总茎数最多,小麦获得最高产,产量达9 000kg/hm2。     

杂交稻新组合主要农艺性状配合力分析及利用评价

利用引进的5个不育系(全丰A、谷丰A、天丰A、广抗13A、蓉18A和Ⅱ- 32A)和自育的6个恢复系(YR1577、YR2292、YR3003、YR4245和YR7633)进行不完全双列(NCII模式)杂交,配置的30个杂交组合.对F1代农艺性状的配合力进行分析,结果表明:穗长、穗实粒数、结实率、千粒质量和单株产量的特殊配合力高于一般配合力,说明大多数农艺性状受非加性效应影响大;亲本方面,穗长、有效穗数、穗总粒数、穗实粒数、千粒质量的性状表明恢复系对后代的影响大于不育系.综合考虑配合力和遗传力效应,选育高产量的杂交组合以Ⅱ- 32A/YR2292和广抗13A/YR7633优势较为明显.     

覆膜对镉污染土壤油菜生长特性影响研究

通过不同镉含量土壤上的覆膜油菜微区试验,分析了覆膜和镉含量对油菜生长特性的影响.结果表明,覆膜和不覆膜的油菜株高、鲜物质量和干物质量均随着生长时间的延长而增大,生长相同时间,随着土壤镉含量的增高,油菜株高、鲜物质量和干物质量遂渐减小;在不同生长时间,覆膜处理的油菜株高、鲜物质量和干物质量均明显大于不覆膜处理,随着生长时...