绵羊盲肠和结肠综合肌电的活动规律

盲肠和结肠初袢的电活动，均为短周期移行性综合肌电。起自盲肠尖的大量峰电，可移行止于结肠初袢远端；而起自结肠初袢远端较多的峰电，能直接移向盲肠尖；起步于盲肠基的峰电能发生两向移行。结肠旋袢和终袢的电活动，均为自发地短周期综合肌电；并以旋袢的周期为最短。此外结肠终袢还产生大振幅（１７０．５４μＶ）、长间歇（３５．９４ｍｉｎ）、持续性（５．３９ｍｉｎ）峰电活动。     

重庆市甘薯资源调查及其发展燃料乙醇产业潜力分析

燃料乙醇是一种理想的生物质能源。甘薯是中国生产燃料乙醇的主要原料之一，符合中国生物质能源产业发展方向。通过对重庆市甘薯生产与利用情况的初步调查，结合当地资源优势，对重庆市利用甘薯发展燃料乙醇的潜力进行了分析，认为重庆市甘薯燃料乙醇可持续发展的最大潜力为每年100万t左右比较适宜。     

贵州主要粮油作物高产潜力研究Ⅳ土地生产潜力研究

研究了作物超高产中的土地生产潜力问题。选择具有代表性的、能直接反映土壤函数的主导性指标,参照贵州省土壤等级划分标准对贵州土壤进行等级划分,根据每个等级土壤限制因素大小确定土壤函数,将土壤生产潜力的内涵定位为:除去人为干预措施外(包括工程、施肥等)的生产能力。以此法计算了贵州省的水稻土壤生产潜力,并以贵阳市花溪区中产田超高产调控试验作为验证,土壤生产潜力与实际结果较为吻合。     

Differences in winter-hardening between phenotypes of Lolium perenne with contrasting water-soluble carbohydrate concentrations

Carbohydrates are essential for the winter-hardening of temperate grasses, affecting both rate of hardening and level of frost hardiness. The rate and extent of winter-hardening of contrasting phenotypes of two Lolium perenne cultivars targeted for differences in water-soluble carbohydrates concentration were quantified under controlled hardening conditions and standardized freeze testing. The phenotype with the lowest water-soluble carbohydrates concentration had a lower rate of hardening and tolerated less frost than the other phenotypes but the effect of water-soluble carbohydrate concentrations on the hardening processes levelled off at increasing water-soluble carbohydrate concentrations, indicating a threshold. Contrasting responses to freezing were found for survival and for potential for tillering and regrowth. Mortality was little affected by the higher test temperatures, while tillering was negatively affected, even at −5°C. Compensatory regrowth of tillers surviving the lower test temperatures partially compensated for the effects of loss of tillers on regrowth. The hardiest phenotypes had a rapid lowering of LT₅₀ during the first 3 d (−1·65°C d⁻¹), acquiring LT₅₀ values at −15°C or below in 10 d. The hypothesis that rate and maximum level of hardening increase with water-soluble carbohydrates concentrations in stubble is supported by the results.     

白灵菇菌丝生长条件的研究

对白灵菇菌丝进行了不同碳源、氮源、温度、pH和通透气生长特性影响的研究。结果表明菌丝生长的最适碳源为蔗糖；最适氮源为蛋白胨和硝酸铵；最适温度为22℃-30℃；最适pH为6．5～7．5；充足的氧气有利于菌丝生长。     

总等电位联结在TN系统中的作用

总等电位联接属于保护接地的一个形式,它的概念是将建筑物内所有外带电金属汇接到进线配电箱近旁的接地母排即总接地端子板上而互相联结。它能在降低预期接触电压方面起到良好的效果。从而保证了在故障情况下的人身安全。所以在工程设计中,应遵照有关规范规定进行建筑的总等电位联结。     

FAO—AEZ法计算气候生产潜力的模型及应用分析

介绍了ＦＡＯ－ＡＥＺ计算气候生产潜力方法的计算模型,以赣州市晚稻生产为例对本模型进行了验证,结果基本吻合,并由此算得赣州市晚稻生产的可能潜力。分析了本模型在制订作物最优灌溉方案、进行土地评等定级和农业气候区划方面的应用前景。     

阴极保护状态下管道特殊位置的电位测量

阴极保护效果直接关系到埋地管道的寿命和运动安全。在管道特殊部位,采用常规方法评估阴极保护效果往往产生偏差,给安全运行留下隐患。通过对测式数据的分析,指出管道特殊位置产生问题的原因,为地面测试管－地电位评价法提供了有益的补充和借鉴。     

几个抗旱树种木质部栓塞脆弱性模型的探讨

根据５种抗旱树种一年生小枝的水势和导水率数据资料,在模型ｙ＝ａ＋ｘｂ的基础上,对此模型进行改造得模型ｙ＝ａｅｂｘ,并另提出模型ｙ＝ｘ２ａ＋ｂｘ２。从相关指数计算得各树种的最优模型。     

Corn earworm (Lepidoptera: Noctuidae) damage at various kernel development stages on food maize

Feeding by corn earworm, Heliocoverpa zea (Boddie), larvae lowers the quality of food maize by causing damage to kernels that results in discoloration of food maize products during cooking. This damage includes kernel cracking or nipping of kernels by larvae. Larval infestations were highest from first silk to early dough growth stages. Infestations during the silk and blister-dough stages caused the least amount of kernel damage on an ear. The area on an ear exposed to corn earworm damage during the blister, dough, or dent to harvest treatments was similar. Kernels were most susceptible to quality loss when they were hardening. Yield was not affected by corn earworm feeding, but the highest quality loss occurred on ears exposed to earworms during the dent-harvest period and throughout the season. Consequently, late season control actions (during the dough stage) would be more effective for reducing quality loss from corn earworm feeding on food maize, than is the present practice of spraying during the green silk stage.