虎舌红营养器官分泌结构的解剖学观察

利用植物解剖学方法对虎舌红(Ardisia mamillataHance)的分泌结构进行观察。结果表明:虎舌红具有发达的分泌结构。其分泌结构分为内分泌结构(分泌细胞和分泌道)和外分泌结构(腺毛和分泌表皮)。植株的茎、叶均密被腺毛,而分泌细胞及分泌道则广泛地分布于根、茎、叶的皮层或髓部薄壁组织中;分泌道为溶生型。     

浅圆仓环壁通风降温系统的性能试验与风道设置优化

通风降温是实现粮食保质储藏的重要措施。以大直径浅圆仓为研究对象,建立了环壁分层通风快速降温实验系统,进行了不同工况的降温实验,研究在粮食初入仓阶段的降温过程中,影响粮堆内温度、水分均匀性的因素。结果表明:外界热环境对降温速度有明显影响,过渡季高温期工况和夏季工况下,降温速度分别为0.43和0.16℃/h,纵向层间温差分别为0.5和1.6℃,降温后粮堆平均温度为17.24和22.76℃,分别达到准低温储粮(20℃)和常温储粮(25℃)的范围。采用露点以上温度进行送风,降温过程粮堆内空气相对湿度较为稳定,波动幅度在5%以内。采用计算流体力学(computer fluent dynamic,CFD)方法对环壁风道的配置进行了模拟研究,模拟结果与实验结果的平均相对误差为6.43%,证实了模拟的合理性与准确性。模拟结果表明,环壁风道上移后,增强了上部粮堆的降温效果,提高了整体降温速度,改善了粮堆温度的均匀性。     

热回收通风系统在犊牛舍的应用效果分析

为减少冷应激对犊牛健康的影响,降低冬季犊牛养殖中通风与保温的矛盾,该研究在新疆地区对牛舍热回收通风系统的通风效果及热回收性能进行了评价。试验舍采用2套相同的热回收通风系统进行通风,对照舍自然通风。试验结果表明:热回收通风系统可使舍外进入舍内的新鲜空气温度平均提高10.15℃,日均CO2和NH3浓度分别显著降低173.15和0.63 mg/m~3(P0.05)。2套系统共可为试验舍提供通风量1 097.83 m~3/h,送风管小孔出风口的平均风速为2.45 m/s,风管始末端风速分别为2.76和2.34m/s。该系统的热回收效率为76.17%,能效比为3.1。该系统可以保证良好舍内环境和较高的能量回收效率,缓解冬季犊牛生产中通风与保温的矛盾。     

CD44 expression in the bile duct epithelium is related to hepatic fibrosis in nonalcoholic steatohepatitis rats induced by a choline-deficient,methionine-lowered, L-amino acid diet

Nonalcoholic steatohepatitis is a lifestyle-related disease and an increasing threat worldwide. Hepatic fibrosis, which results from chronic hepatic diseases including nonalcoholic steatohepatitis, is closely correlated with mortality among hepatic lesions, such as steatosis and inflammation. Thus, it is important to identify factors that can serve as diagnostic and therapeutic targets for hepatic fibrosis. In this study, we examined the function of CD44 in the development of hepatic fibrosis in choline-deficient, methionine-lowered, L-amino-acid diet-fed rats, especially with respect to the proliferation of bile duct epithelium. Male Fischer 344 rats were fed a choline-deficient, methionine-lowered, L-amino-acid diet for 2, 4, 13, or 26 weeks. This diet decreased the body weight; increased the levels of serum parameters indicating liver injury, such as aspartate and alanine aminotransferase; upregulated inflammation- and fibrosis-related gene expression in the liver; and resulted in the development of hepatic lesions, including fatty changes in hepatocytes, inflammatory cell infiltration, and fibrosis. Hepatic hyaluronan was synthesized and deposited in the liver tissue. The expression of both CD44 mRNA and protein was significantly increased throughout the experimental period. CD44 protein was observed in some of the bile duct epithelium, around which hyaluronic acid was deposited, and these bile duct lesions were concordant with the area of hepatic fibrosis. Thus, CD44 expressed in the bile duct epithelium may be a target for controlling nonalcoholic steatohepatitis-related hepatic fibrosis.     

轴流式果园喷雾机风送系统优化设计与试验

针对传统风送式喷雾机风送距离短与药液浪费的问题,设计一种适用于传统果园喷雾机的轴流式风送系统。通过设置不同风筒导叶的安装角、数量、长度和锥形多出口装置的锥度、出口布局方式,进一步引导风送系统气流场,并建立相对应的气流场分布模型。通过对比选取风送系统的最佳优化设计方案,并开展了验证试验。试验结果表明,风筒导叶参数对出口风速影响的显著性由大到小为长度、安装角、数量,锥形多出口装置出口布局方式对出口风速的提升效果明显;当风筒导叶安装角为10°,数量为6,长度为20 cm,且锥形多出口装置锥度为2.25、出口布局为A型时,风送系统出口风速及均匀性达到最优,所建立的模型出口风速与试验值相对误差为4.66%和变异系数为3.63%,验证了数值模拟结果的可靠性。在此基础上,通过喷雾机外流场试验可得,射流边界范围随着出口直径和转速的增加而增大,风送距离也随之增大,当风送距离0～2 m,风速大于5 m/s,衰减幅度明显,当风送距离大于2 m时,气流衰减较为平缓,风速距离4 m处风速达到1.5 m/s左右。优化后轴流式果园喷雾机风送系统结构合理,气流均匀性、风速、边界和射程等方面均满足果园植保机械需求,研究...     

多功能减压管在立筒仓和浅圆仓中的应用

在立筒仓及浅圆仓中安装多功能通风熏蒸减压降碎装置,可以有效降低粮食入库破碎率,减少自动分级影响,减缓出库时粮堆整体移动产生的动载荷,保护仓内设施,延长筒仓及浅圆仓使用寿命.同时利用多功能减压管进行内环流熏蒸及通风降温降湿进一步完善了立筒仓及浅圆仓储粮性能,提高了储粮稳定性.     

CORCTATION OF THE AORTA IN A DOG

This paper describes coarctation of the aorta with a large fusiform post-stenotic aneurysm in a 6 year old Great Dane. No clinical signs were attributable to the lesion, which was an incidental finding. The radiological and pathological features of aortic coarctation are described.     

Multiple rib fracture in a neonatal foal using a nylon strand suture repair technique

OBJECTIVES: To report rib fracture repair using the Securos Cranial Cruciate Ligament Repair System (SCCLRS; Securos Veterinary Orthopedics, Charlton, MA) in a neonatal foal. STUDY DESIGN: Case report. ANIMALS: A 1-day-old Standardbred foal with fracture of left ribs 2-9. METHODS: Four days after admission the foal was anesthetized and rib fractures were repaired using open reduction and the SCCLRS. RESULTS: Rib fractures were successfully stabilized and the foal was discharged 7 days postoperatively without further complications. CONCLUSIONS: The SCCLRS provided a straightforward, effective method of rib fracture repair in neonatal foals. CLINICAL RELEVANCE: Effective rib fracture repair in neonatal foals can be achieved with the SCCLRS.     

CIRCUMAORTIC CYSTERNA CHYLI LIGATION

Abdominal and thoracic lymphangiograms were done on seven dogs by cannulation of a mesenteric lymphatic. Dissection and ligation of the cysterna chyli were attempted in two dogs with poor success. Obstruction of thoracic duct flow by circumaortic ligation of the cysterna chyli was attempted in the remaining five dogs. Repeated contrast studies were done immediately following ligation and again after one to seven weeks. The dogs were killed, and postmortem examinations were done immediately after the third lymphangiogram. The circumaortic ligation was effective in all cases as judged by the immediate follow-up study, however, in three of the subsequent follow-up studies, thoracic duct flow had returned through recanalization past the ligature.