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WU Wei-jiang LI Xiao-hong REN Xian-da LUO Yu-hong ZHOU Qi-jing LIANG Xiao-yu 《园艺学报》2003,19(8):1074-1078
AIM: To study the mechanism of the effect of NSAIDs on apoptosis in mice hepatoma at anti-inflammatory doses. METHODS: Kunming breed mice were inoculated subcutaneously in the flank with mice hepatoma H22 cell line. The effects of ibuprofen, indomethacin, and nimesulide on apoptosis were determined by using electron microscopy, agarose gel electrophoresis, flow cytometry, and Western blot analysis of the expression of c-myc, bcl-xL and bcl-2 proteins. RESULTS: NSAIDs induced apoptosis of mice implanted hepatoma, which includes the morphological changes such as reduction in the volume, and the nuclear chromatin condensation, as well as the "ladder pattern" revealed by agarose gel electrophoresis of DNA. The apoptotic index was increased to 15%±1.0%, 29.7%±1.5%, 46.3%±3.5% from 3.3%±0.6% by detecting Sub-G1 peaks on flow cytometry. Western blot analysis showed that levels of bcl-2 and bcl-xL were significantly reduced by treatment with nimesulide. Ibuprofen and indomethacin decreased bcl-2 expression but increased bcl-xL expression. C-myc wasn't changed in these groups. CONCLUSION: These results suggest that NSAIDs induces apoptosis of mice hepatoma, which may be due to their regulation on the expressions of bcl-2 family genes. 相似文献
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以东江中上游6年生的山乌桕、枫香和南酸枣为材料,采用LI-COR公司L i-6400光合作用测定系统测定光合、蒸腾、水分利用效率等生理参数及其光响应过程,探讨3树种在自然生境条件下的光合-光响应特征。结果表明:3树种光合-光响应曲线均符合非直角双曲线模型(R2>0.98)和指数模型(R2>0.98);3树种表观量子效率和暗呼吸速率均表现为山乌桕>南酸枣>枫香,山乌桕在弱光下光合能力要高于枫香和南酸枣,但对光合产物消耗大;山乌桕最大净光合速率与枫香、南酸枣间差异显著(0.05);3树种介于阴生植物和阳生植物之间,山乌桕对强光的适应能力较好,对光照强度表现出一定的适应性和可塑性,具有较宽的光照生态幅,对弱光与强光的利用能力较高;3树种净光合速率光响应均值表现为山乌桕>南酸枣>枫香,耗水能力表现为山乌桕>南酸枣>枫香,而水分利用效率表现为枫香>山乌桕>南酸枣。 相似文献
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近年来,我国经济迅速发展,林业经济发展也趋于国际化,发展动力持续增强。然而,在此形势下也逐渐暴露出个别问题,一定程度上影响了我国林业工程及林业经济发展。鉴于此,对存在于营林生产管理中的个别问题进行了剖析,并以具体情况为根据提出了合理有效的解决策略,为我国林业经济可持续发展的实现奠定基础。 相似文献
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稻瘟病田间自然诱发病圃的建立及其在抗性鉴定中的应用 总被引:1,自引:5,他引:1
稻瘟病田间自然诱发病圃法是目前自然接种类应用最广的方法,成本低、操作简便.病圃应设置在不同水稻生态区域的稻瘟病常发、重发区,并插植合适的感病诱发品种群.广东3个病圃设置合理、小种多样性、代表性好,年度间鉴定结果稳定可靠.2004~2006年对145个广东省区试品种在病圃进行的抗性鉴定,结果表明参试品种在米质、产量提高的同时稻瘟病抗性水平均有所提高.说明将病圃作为抗性筛选基地对亲本或低分离世代进行抗瘟筛选有益于降低抗病育种的盲目性和年限. 相似文献
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幼果嫁接即是在进行疏花疏果时,把挂果量多的植株上需要疏去的过多过密果,连果柄剪取下来,嫁接在生长健旺而挂果量少的植株上,达到生产成本不变而产量提高的目的。经试验研究,官溪蜜柚幼果嫁接成活率为95.6%,产量可提高10%~15%。 相似文献