嵌入式实验教学系统开发与应用

本文针对嵌入式实验教学系统的特点,介绍了对其在教学、实验等方面的改革设想、尝试与体会。     

水曲柳种子次生休眠解除过程中的物质转化与内源激素变化

以高温诱导得到的水曲柳次生休眠种子为材料,探讨种子次生休眠解除过程中物质转化和内源激素的变化规律.结果表明:次生休眠解除过程中,种子的脂肪酶活性和脂肪酸质量分数快速增加;β-淀粉酶活性显著提高,可溶性糖和可溶性蛋白的利用加快;种子内源ABA质量分数持续下降,GA3/ABA、IAA/ABA和ZT/ABA均显著升高,种子贮...     

农业院校嵌入式系统课程实验设计

根据嵌入式系统课程的特点和农业院校培养人才的目标,就农业院校嵌入式技术的实验项目、教学层次进行了探索;提出将实验划分为基本技能实验、综合设计实验和创新研究实验3类,并给出了相应的实验内容。实践证明：这些内容构成了完整的实验教学体系,能够使学生循序渐进地学习和掌握嵌入式系统开发流程,对于提高学生的研发能力和创新能力大有帮助。     

图书馆嵌入科研课题组学科服务模式探析

在泛在知识环境下,图书馆的嵌入式服务仍处于探索中。通过分析图书馆嵌入式学科服务与科研课题组的学科信息需求的关系,构建图书馆嵌入科研课题组学科服务模式,阐述其模式的实现,从而深化图书馆的学科服务水平。     

基于嵌入式系统的洪泽湖水产养殖污染环境的远程数据采集与监测

针对洪泽湖污染事件频发且对水产养殖业已经造成重大损失的现状,提出一种专门针对洪泽湖水产养殖污染环境的数据采集及监测系统。该系统主要利用嵌入式S3C2410及MAX197芯片实现了对多通道污染信息的数据采集与监测过程,可以根据不同模拟通道的特点,通过MAX197的控制字,不同的信号输入范围和采样模式实现多样化采样方式和不同量程的数据采集。另外,在有效采集由污染检测传感器测得的多路污染信号之后,系统能够将各水质原始资料数据封装并通过GPRS模块发送给上位机或中心服务器进行后续的处理分析,从而满足了水质数据实时监测要求,实现对污染参数的自动监测。整个系统的成本低功耗低,具有较高的实用性和可靠性,将会成为洪泽湖水产养殖污染环境数据采集与监测的一种有效手段。     

微生物在富营养化水体生物修复中的作用

本文简要介绍了水体富营养化的成因、判别标准及富营养化水体生物修复中有效去除氮、磷元素过程中所涉及的重要微生物,进一步分析了各种不同水体生物修复微生物在碳、氮、磷、硫元素循环中的作用,揭示了微生物在水体生物修复中的作用.最后,简要总结了近年来水体微生物修复的研究进展及微生物制剂的应用,并对今后水体生物修复系统中微生物的研究提出建议.     

试验性趾叶炎小鼠肠组织中P物质的表达

[目的]为动物趾叶炎的预防和治疗提供免疫学基础。[方法]对昆明种小白鼠注射二磷酸组织胺制备趾叶炎小鼠病理模型,以注射生理盐水为对照。分别于给药后2、14、24、48、72 h及15、30 d取小鼠3~5 mm长的小肠组织块,检测肠组织中炎性细胞、杯状细胞、肥大细胞及其脱颗粒数、P物质表达水平的动态变化。[结果]趾叶炎小鼠的肠腺结缔组织内及其绒毛上P物质表达异常丰富,且P物质呈单根或片状走行,并与肥大细胞串联及相邻排列,随给药时间的延长,P物质表达逐渐增强,肥大细胞及其脱颗粒数也急剧增多 炎性细胞、杯状细胞、腺体数量与肥大细胞的变化趋势一致 给药72 h后,血管内壁出现裂隙,肠粘膜出现水肿。[结论]肥大细胞参与小鼠趾叶炎的发病过程,并影响小鼠肠粘膜的通透性。     

Effects of topical perineural capsaicin in a reversible model of equine foot lameness

Capsaicin is a local substance P depleter with dramatic analgesic effects. We tested the hypothesis that the topical application of capsaicin ointment over the palmar digital nerves would attenuate the clinical effects of a reversible model of equine foot lameness. Seven healthy adult horses shod unilaterally with adjustable heart bar shoes were studied in a crossover design for 2 weeks. Grade 5.0/5.0 lameness (nonweight bearing) was induced by tightening the adjustable heart bar shoe. One hour later, capsaicin ointment was applied over the medial and lateral palmar digital nerves 3 cm proximal to the coronary band, or horses were left untreated. One week later, treatment assignments were reversed, and the experiment was repeated. The heart rate was markedly lower in treated than in untreated trials at 20 and 40 minutes after capsaicin and between 1.6 and 3.6 hours after capsaicin (P < .05). The lameness score was markedly decreased in capsaicin-treated horses at 40 minutes and from 1.3 to 4 hours after treatment (P < .05). We conclude that the topical application of capsaicin ointment over the palmar digital nerves provided measurable pain relief for up to 4 hours after treatment (P < .05). The clinical application of this analgesic technique in horses with spontaneous clinical or induced laminitis or other sources of foot pain remains to be shown.     

乳腺炎大鼠生殖器官中P物质的表达与肥大细胞的形态学观察

应用组织化学方法及免疫组化技术对正常组和急性攻毒组大鼠生殖器官中肥大细胞的活性以及P物质表达水平的动态变化进行了研究.结果表明:攻毒后6小时子宫和卵巢炎性细胞、肥大细胞及其脱颗粒数量达到峰值,而后开始减少,48～72 h又开始回升,其中炎性细胞均极显著高于攻毒前(P＜0.01);肥大细胞除子宫攻毒后12小时(P＜0.05),其余均极显著高于攻毒前(P＜0.01);肥大细胞脱颗粒数攻毒后6小时、72小时显著高于攻毒前(P＜0.05),且在攻毒后72小时子宫内膜和6小时卵巢皮质的小血管内皮细胞均出现轻微脱落损伤;同时不同时相P物质表达的趋势与炎性细胞、肥大细胞及其脱颗粒数量变化相吻合,且P物质神经纤维与肥大细胞相关联.说明在乳腺炎中P物质、肥大细胞影响生殖.     

Severe oxidative stress is thought to be a principal cause of jaundice of yellowtail Seriola quinqueradiata

The jaundiced yellowtail Seriola quinqueradiata had yellow discolored skin and hyperbilirubinemia. Histology revealed that hemosiderin and ceroid occurred in the spleen. In the vascular system, there were vasculitis and sinusoidal dilatation. Hepatic cells showed degenerative figures with pyknotic or karyolytic nuclei, basophilic cytoplasm, cytoplasmic vacuoles in various sizes, and ceroidosis. In the bile duct system, however, there was no noticeable change. Hemoglobin contents of jaundiced fish were similar to those of control fish. Plasma taurine levels of jaundiced fish were significantly lower than those of control (p0.05). Judging from 2-thiobarbituric acid reactive substance values, in vivo lipid peroxidation progressed in the liver of jaundiced fish. In the plasma of jaundiced fish, contents of unconjugated bilirubin were significantly higher than those of conjugated bilirubin. A large amount of substance Xs, breakdown products of bilirubin scavenging active oxygen species, existed in the plasma of jaundiced fish. Therefore, jaundiced fish may suffer from severe oxidative stress, which might be a principal cause of jaundice. Liver superoxide dismutase and glutathione peroxidase activities of jaundiced yellowtail were significantly lower than those of controls.