24月龄生长母水牛绝食代谢的研究

用传统开路式牛用呼吸面具对24月龄母水牛绝食产热(Fasting heat production,FHP)进行研究。结果表明:①24月龄母水牛FHP为306.013kJ/kgW0.75·d;每天排出内源尿氮(EUN)为39.66g;单位代谢体重每天排出EUN为0.48g;蛋白分解产热占总产热量为17.13%;EUN与FHP比值为1.60mg/kJ。②24月龄母水牛维持净能需要:NEm=397.817kJ/W0.75·d。     

党参小包装饮片养护方法研究

[目的]通过对比不同包装、贮藏条件对党参小包装饮片内外质量的影响,建立适合党参小包装饮片的养护贮藏方法.[方法]党参饮片分别采用聚乙烯塑料、铝箔、牛皮凝膜纸袋3种包装材料包装,做真空/非真空处理后,藏于不同温湿度的环境中,定期考察外观性状、水分、浸出物、多糖及其总黄酮等指标的变化.[结果]前6个月内,各组的检测指标均无明显变化;12个月时,非真空包装样品中的多糖、总黄酮含量均呈显著变化,且室温下贮存的纸袋包装样品出现了虫蛀,色泽变暗、变深的现象;18个月时,除真空包装冷藏处理的各样品以及阴凉条件下的铝箔真空包装样品各检测指标与0个月差异不大外,其余均有明显的性状或含测指标变化.[结论]结合养护成本综合考虑,党参小包装饮片可采用真空塑料或铝箔包装,存放于阴凉干燥处.     

Characterization of Leptospira infection in suckling and weaning rat pups

Rats are known to be the most important reservoirs of Leptospira spp. However, the leptospiral dose and age at which rats become resistant to Leptospira infection are not yet well elucidated. Aimed to characterize leptospirosis in rat pups, we found that suckling pups (4-, 7-, and 14-day old) are susceptible to leptospires and resistance starts from the weaning age (23-day old). Susceptibility of rat pups was also affected by the infecting dose of the organisms. Jaundice, decrease in body weight, and neurological symptoms prior to moribundity was evident in infected suckling pups. However, 23-day-old infected pups did not manifest any pathological changes and were able to survive the infection similar to adult rats. Based on these results, we propose the suckling rat pup as a novel animal model of human leptospirosis to investigate pathogenesis, development of host resistance, and the mechanisms involved in rats becoming maintenance hosts for leptospires.     

影响泵站机电设备维修质量原因分析与对策

分析了影响泵站机电设备维修工作质量的原因，提出了确保维修工作质量的对策：一是要根据各业务单位和部门的工作性质进行劳动体制和用工改革，二是要针对工作实际进行全体员工的素质培训，三是要钻研技术革新，合理利用新设备和新技术。     

我国专利中拖拉机及车辆维护用材料的开发概况

介绍了国内发明专利中拖拉机及车辆维护用先进材料的新进展,其中包括制动材料、密封材料、润滑材料、快速堵漏剂、防冻液、防垢除垢材料、清洗剂、轮胎自补剂、涂料及修理工护肤产品等。     

农用机械停放期间自然侵蚀与防护

长时间停放的农用机械,极易出现金属生锈、橡胶制品老化、油料变质等情况。在机械长时间停放的过程中,要加强管理,针对不同情况,及时有效地采取防护措施,才能尽可能地避免或减缓机械停放过程中各种外界因素对机件带来的不良影响,保持机械的固有性能,使之处于良好的技术状态。     

原生态黄山松的保护性开发

黄山御墅天筑山地别墅内原生态资源丰富,尤其是原生态黄山松保护性开发成为项目的重点,从现状调查、原因分析、解决实施三个阶段入手,通过规划设计、建造施工和养护管理,合理避让和利用,基地现场的黄山松90%保留,将项目不露痕迹的融合在自然景观里,成为尊重原生态,可持续发展的景观项目。     

大型鱼类干制标本的修复和保存研究

介绍了我所存放的40余件大型海洋渔业生物标本的制作年代与现状。近年对这些标本的修复进行了研究,通过实践探索,运用工艺技术,实行全面的修复和维护保养工程,取得了理想的效果,并总结这次修复技术工作的过程和方法,对干制标本的长久性保存和维护进行了探讨。     

Green roof vegetation type affects germination and initial survival of colonizing woody species

Green roofs provide a number of valuable ecosystem services compared to conventional roofs, but may require yearly maintenance. Trees and other woody plants that persist on the roof may damage or overload shallow-substrate green roofs and their removal is a standard maintenance procedure. The germination potential of colonizing species may differ depending on the vegetation surrounding them. The aim of this study was to determine whether the germination of colonizing tree species (Picea glauca and Ulmus glabra) will vary depending on which plant species form the established vegetation seeds land in. To determine germination success, survival, and seed capture ability of the plant canopy, tree seeds were added either directly to the growing medium or atop the plant canopy, in replicated monocultures of 14 species native to Nova Scotia. When seeds were added directly to the soil, no significant difference was detected between the monocultures for germination success or survival for U. glabra or P. glauca. However, when the seeds were added atop the plant canopy, percent germination of U. glabra was significantly higher in Carex argyrantha green roof modules. Overall, sod forming graminoids showed higher germination of U. glabra. The number of seeds reaching the soil was typically lower in vegetation with a denser canopy. This study demonstrates that some vegetation repels colonizing tree species by reducing ground contact. Although these effects differed according to tree species, non-vegetated substrates enhanced seedling persistence. Additionally, the majority of tree seeds that germinated failed to survive a single growing-season on shallow-substrate green roofs.     

恒温恒湿检定系统日常维护与故障分析

简述了伟思富奇恒温恒湿箱以及与之配套使用的神荣露点仪日常维护与保养的注意事项,指出以预防故障为前提的日常维护工作的必要性.分析了设备可能出现的故障情况,并列举排除故障的方法和维修措施.