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板蓝根粗多糖对免疫抑制小鼠的免疫调节作用 总被引：1，自引：0，他引：1
将试验小鼠分为对照、模型和剂量(低、中、高)组,建立免疫抑制模型。对照组、模型组饲喂基础饲料,剂量组分别饲喂含不同板蓝根粗多糖的饲料。6周后测小鼠血常规指标、脏/体比、血清白介素-2(IL-2)及肿瘤坏死因子-α(TNF-α)的含量。结果表明,免疫抑制小鼠的白/红细胞数、血小板数和血红蛋白值均随粗多糖剂量的增加而增大;体增质量对照组最大,低、中、高剂量组和模型组依次递减;各剂量组脏/体比均明显小于对照组;各剂量组小鼠血清中IL-2和TNF-α水平均显著上升。说明板蓝根粗多糖能提升小鼠免疫功能,但对小鼠的发育有一定影响。 相似文献
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随着科技的进步和人们生活水平的提高,食品防腐问题越来越受到大家的关注。近年来,人们逐渐发现化学防腐剂对人体健康存在巨大的危害,于是开始致力于绿色、安全、广谱、高效的天然防腐剂的开发。本研究以黑曲霉、桔青霉、黑根霉、米曲霉、绿色木霉、大肠杆菌、枯草芽孢杆菌、金黄色葡萄球菌和肠炎沙门氏菌为供试菌种,采用菌丝生长速率法和滤纸片扩散法研究了其抑菌性能。结果表明:泡桐花无水乙醇提取物具有广谱的抗菌性能,对黑曲霉、米曲霉、黑根霉和绿色木霉的EC50值分别为7.33 g·L-1、14.15 g·L-1、13.11 g·L-1和9.71 g·L-1,对枯草芽孢杆菌、金黄色葡萄球菌、沙门氏菌的最低抑菌浓度(MIC)值分别为5.0 g·L-1、10.0 g·L-1和10.0 g·L-1,最低杀菌浓度(MBC)值分别为10.0 g·L-1、20.0 g·L-1和20.0 g·L-1。综上所述,泡桐花对食品防腐中常见的菌种具有较强的抑制活性,是一种质优价廉的材料,作为天然食品防腐剂具有很大的开发潜力。 相似文献
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Alternaria brown spot disease is a serious disease in mandarins and their hybrids without effective disease control measures. In recent years, induced plant resistance has been studied as an alternative to classical pesticides, but few studies on the effectiveness of these products and their long-lasting effects in woody crops have been performed. After two inoculations with Alternaria alternata, citrus plants that were treated with hexanoic acid showed enhanced resistance, displaying lower levels of disease incidence associated with an activation of the jasmonic acid pathway, the accumulation of phenolic compounds and the expression of defensive genes, such as polygalacturonase-inhibiting proteins. 相似文献
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建设绿色浮梁开拓绿色财富 总被引：1，自引：1，他引：1
在分析浮梁县经济社会的现状和动态发展后,简要阐述绿色财富和绿色浮梁的含义,继而在科学发展观的指导下提出“文化生态立县,绿色科技兴县,绿色工业强县,全民创业富县,平安和谐建县”的发展战略,进而提出“保护和发展森林资源,开拓绿色市场经济,进一步提升工业化水平,加强基础设施建设,夯实县域财政基础”等战略对策。其中绿色市场经济是本着创新的精神,试图进行一些探索。选取全省一些重点林业县,运用主分量分析的方法对社会经济指标和林业经济指标进行综合排序,浮梁县分别位于第四名和第五名。 相似文献
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A. Ortuo I. Nemsa N. Alvarez A. Lacasa I. Porras A. Garcia Lidn J.A. Del Río 《Physiological and Molecular Plant Pathology》2008,72(4-6):162-166
The susceptibility of Fortune (Citrus clementina × Citrus reticulata), Citrus paradisi and Citrus limon fruits to Alternaria alternata pv. citri was investigated using different artificial inoculation methods. The results obtained reveal that the C. paradisi and C. limon fruits are less susceptible to A. alternata pv. citri than Fortune fruits, although all showed symptoms of Alternaria brown spot when the cuticle was broken and the flavedo or flavedo + albedo was removed. Furthermore, it was seen that susceptibility to the fungus decreased as the age of the fruit increased. There was a positive correlation between the susceptibility of the different Citrus fruits to A. alternata pv. citri and their “in vivo” ethylene levels, the most susceptible fruit (Fortune) producing more ethylene during growth than the less susceptible C. limon and C. paradisi. This suggests that ethylene may well be considered as a possible marker of Citrus fruit susceptibility to A. alternata pv. citri. Disease development increased when the Fortune fruits were treated with 1 mM ACC (a precursor of ethylene biosynthesis) or 1 mM Ethephon (an ethylene-releasing compound) prior to inoculation with A. alternata pv. citri. The role of ethylene as a factor involved in disease development is discussed. 相似文献
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不同基质和植物生长调节剂对香榧扦插生根的影响 总被引：1，自引：0，他引：1
采用5种不同基质和3种植物生长调节剂对香榧(Torreya grandis Fortune ex Lindl.cv.Merrillii)枝条进行扦插试验,以找出最适合香榧枝条扦插生根的基质以及植物生长调节剂种类与浓度。结果表明,最有利于香榧枝条扦插生根的基质为草炭+珍珠岩(3∶1),其平均根长和生根率最高,分别为8.1 mm和54.10%;用NAA处理优于IBA和生根粉,NAA最佳浓度为2 000 mg/L,生根率达72.11%。 相似文献
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