秸秆沼气集中供气工程运行管理维护研究

文章针对凤凰村秸秆沼气集中供气工程运行管理维护中存在的问题,进行分析并提出了相应的解决办法,为今后秸秆沼气集中供气工程建设及运营提供经验和借鉴。     

Chronic otitis externa with heat shock protein 70-positive intranuclear inclusion bodies in the ceruminous gland epithelium of a Chihuahua dog

A Chihuahua dog showed persistent itching in the right ear canal. Anti-inflammatory medicines and prednisolone were ineffective and total ear canal ablation was performed. Histological diagnosis was chronic otitis externa. Eosinophilic intranuclear inclusion bodies (Cowdry type A and full-type) were occasionally observed in the ceruminous gland epithelium. The inclusion bodies were negative for nucleic acid and ultrastructurally composed of fibrous structures (approximately 10 nm in width). Viral infection was initially suspected, but polymelase chain reaction tests did not detect the expected viral genes. Immunohistochemistry revealed that the inclusion bodies were positive for heat shock protein 70 (HSP70), suggesting that these bodies could be protein aggregates including HSP70. The etiology of this lesion has not been elucidated, but chronic inflammation may influence the cytoplasm-to-nuclear transportation of HSP70. To the best of our knowledge, this is the first report of canine chronic otitis externa with HSP70-positive intranuclear inclusion bodies.     

去势和热应激对筠连黄牛生产性能、瘤胃发酵和血液生化指标的影响

为研究去势和热应激对筠连黄牛生产性能、瘤胃发酵和血液生化指标的影响,本研究选用18头16月龄、体重相近((292.35±28.71) kg)的不同去势程度筠连黄牛(全去势FCG、半去势HCG、假手术SOG),分为3组,每组6个重复,每个重复1头牛,根据试验期间牛舍温湿度指数(THI),分为热应激期(7、8月)和非热应激期(9月),分析去势和热应激对黄牛各指标的影响。结果表明：1)与非热应激期相比,热应激期牛舍THI、肉牛呼吸频率和直肠温度均显著提高(P<0.05)。2)去势和热应激均显著提高血清热休克蛋白70、高密度脂蛋白(HDL-C)、低密度脂蛋白(LDL-C)和雌二醇浓度(P<0.05),而睾酮、甲状腺素(T4)、胰岛素和游离脂肪酸浓度显著降低(P<0.05),且除血清葡萄糖、T4和LDL-C外,去势和热应激对其他血清指标存在显著互作效应(P<0.05)。3)全去势和热应激均显著降低肉牛平均日增重(ADG),且存在显著互作效应(P<0.05)。4)热应激期,去势显著降低粗蛋白、酸性洗涤纤维和钙表观消化率以及血清总抗氧化能力(T-AOC)(P<0....     

山药片红外联合热风干燥热质传递收缩模拟与品质

为了准确揭示山药片红外联合热风干燥传热传质机理,在考虑山药片收缩变形特性的基础上,通过有限元软件COMSOL6.1建立了“温度场-湿度场”多场耦合的山药片红外联合热风干燥传热传质模型。模拟研究基于山药片在不同温度（50、60、70 ℃）下收缩变形的传热传质,并通过试验进行验证。分析不同温度对山药片品质（色差、复水比、多糖和尿囊素含量）的影响。结果表明：1）山药片体积比随干燥温度的升高而增加,在干燥温度分别为50、60、70 ℃时,其值分别为34.55%、37.23%、39.04%。2）在干燥温度为50、60、70 ℃时,红外联合热风干燥收缩模型可准确预测山药片干燥过程中干燥温度和含水率,其决定系数R²分别为0.973、0.976、0.981和0.983、0.984、0.974。3）山药片外部温度升高,表面水分开始蒸发,形成水分梯度。随着干燥的继续,红外热量在山药片内部不断积累,导致内部温度升高,水分向外扩散,进而减小了内外水分梯度。随着干燥温度的升高,增加了山药片温度和湿度梯度,促进了热量和质量的传递,提高了水分迁移的速率。4）在60 ℃时,干燥品质最优,其色差为7.49、复水比为2.65 kg/kg、多糖含量为24.17 mg/g、尿囊素含量为2.66 μg/g。该模型为其他物料在红外联合热风干燥技术的模拟研究提供有益借鉴。     

Initiation and development of microspore embryogenesis in recalcitrant purple flowering stalk (Brassica campestris ssp. chinensis var. purpurea Hort.) genotypes

Purple flowering stalk (Brassica campestris ssp. chinensis var.purpurea Hort.) was generally regarded as a recalcitrant species for microspore culture in Brassica crops. Conditions for reliable induction of microspore embryogenesis were studied in 12 genotypes of purple flowering stalk. A treatment of short heat shock to microspore by incubating at 32 °C for 18 h was suitable for the survival of microspores, sustained cell divisions, and further induced embryogenesis. Subsequently, the reduced concentration of macro salts (1/2 NLN) provided an optimal condition for the development of embryoids. Under the optimized conditions for microspore embryoid development, 10 genotypes responded to microspore culture with the frequencies ranging from 2.7 to 70.5 embryoids per dish. However, regenerated plants were obtained from 9 genotypes, and more than 75% these regenerated plants were double haploid. This report establishes an efficient protocol for microspore culture and offers great potential for DH breeding in purple flowering stalk.     

不同贮前热处理对青种枇杷果实贮藏效应的研究

通过采用不同的贮前热处理温度和时间组合,研究白沙枇杷青种在低温条件下的贮藏的内外品质的变化.结果表明:3种贮前热处理中,B处理(45℃热水处理10 min+低温(6±1℃))的效果最好,不仅青种枇杷果实的失重率和腐烂率低;而且贮藏到30 d时,枇杷果实的固酸比最高,较好保持了果实的风味.     

干燥过程的变质量热力学分析

对一种典型热泵干燥系统进行了实验研究,并进行了干燥过程的变质量热力学分析,其方程具有普遍性。对过程进行质量守恒分析和变质量热力学第一定律分析,得到了干燥过程需热量和干燥效率等参数,并与经典热力学分析方法做出比较,最后给出了实际干燥过程为等焓过程的条件。     

添加剂湍流减阻流动的传热特性数值计算

采用雷诺应力模型和Cross粘度方程,对二维轴对称圆管内湍流流动的聚丙烯酰胺稀溶液（PAM）的流场和温度场进行了数值模拟.在数值计算结果的基础上,系统研究了流速对减阻流体的减阻性能和传热特性的影响.结果表明,减阻流体的减阻率和传热降低率随流速的增大逐渐增大到渐进值,而且传热降低率恒大于减阻率.减阻流体柯尔本（Colburn）因子与摩擦系数的对比结果表明柯尔本比拟,特别是在较低流动雷诺数下有较大偏差.     

冷冲击处理对贮藏期间银杏硬化的影响

以南雄产银杏（ＧｉｎｋｇｏｂｉｌｏｂａＬ．）为材料,以０℃的冰水混合物为冷却介质,研究了不同冷冲击处理（１ｈ,２ｈ,３ｈ,４ｈ）对贮藏期间银杏硬化的影响结果表明,冷冲击处理能显著地控制白果的硬化,硬化率随处理时间的延长而降低