沙棘叶中4，4′-二羟基-2′-甲氧基查耳酮的分离与鉴定

利用硅胶柱和葡聚糖凝胶柱层析，从沙棘叶子中分离并鉴定出黄酮类成分，进一步分离得到4，4′-二羟基-2′-甲氧基查耳酮，并对其结构进行了结构鉴定。     

Relation between TNF-α,TNFR I expression and apoptosis in oral lichen planus

AIM: To examine the expression and distribution of tumor necrosis factor-α (TNF-α), tumor necrosis factor receptor I (TNFR I) and apoptosis in oral lichen planus, and evaluate their roles and relation in the oral lichen. METHODS: Immunohistochemical technique and TUNEL were employed to study the expression of TNF-α, TNFR I and apoptosis in 50 cases of oral lichen planus and 10 normal oral mucosa specimens. RESULTS: Compared with the normal control group, TNF-α expression was upregulated in mononuclear cells in lamina propria and decreased in keratinocytes in oral lichen planus lesion (P<0.05). On the contrary, TNFR I expression was increased in keratinocytes and decreased in lamina propria in oral lichen planus lesion (P<0.05). The increased apoptosis index in keratinocytes and the decreased apoptosis index in lamina propria were found in oral lichen planus (P<0.05). CONCLUSION: The accelerated apoptosis of keratinocytes and the inhibition of lymphocytes apoptosis may contribute to the formation and progression of oral lichen planus.     

Astrocyte proliferation in the rat hippocampus after middle cerebral artery occlusion

AIM: To study rat astrocyte proliferation in ipsilateral hippocampus following focal cerebral ischemia. METHODS: Ischemia was induced by temporary middle cerebral artery occlusion (MCAO). In hippocampus of rats at 3, 7 and 30 days after MCAO, the numbers and anatomic distribution of glial fibrillary acidic protein (GFAP) were detected by immunohistochemistry. The protein expression of GFAP and proliferating cell nuclear antigen (PCNA) in the ipsilateral hippocampus were analyzed by Western blot analysis. RESULTS: Astrocytes appeared hypertrophic, with increased process thickness and numbers at 7 days after MCAO, and the highest density of astrocytes were seen at 30 days in the CA1, CA2 regions of the ipsilateral hippocampus. Western blot analysis revealed that GFAP levels were normal at 3 days, but increased by 7 days and remained elevation at 30 days. Western blot analysis of PCNA protein also revealed identified upregulation PCNA at 3 days after MCAO and the expression peaked at 7 days. CONCLUSION: This study demonstrates that focal cerebral ischemia in the rat results in a rapid response, a process often referred to as reactive astrogliosis or glial scarring, from resident astrocytes of the ipsilateral hippocampus to the side of ischemia.     

云南哀牢山自然保护区南华片区项目建设必要性分析

对哀牢山国家级自然保护区南华片区的生物多样性、经营现状和经营管理进行评价,对项目建设必要性分析结果:项目建设有利于该保护区的整体效应;有利于对珍稀植物物种和生态系统的保护;有利于对候鸟迁徙通道的保护;有利于社会经济的可持续发展;是加强科研和宣教工作的需要。最后阐述了项目建设的主要内容。     

基于水文水动力模型的浦阳江流域洪水情景模拟

浦阳江流域地形复杂,包括山丘、盆地和平原.中游诸暨盆地是人口主要聚集地,受上游山区洪水和下游钱塘江潮位顶托影响,洪涝灾害形势严峻.为解决上述问题,本文对流域上游山区采用新安江水文模型模拟降雨径流过程,对下游盆地区采用IFMS一、二维水动力模型模拟水流运动,并以水文模型的计算结果作为水动力模型的边界条件进行水文水动力模型...     

一种新型双翻斗雨量计的研制

翻斗式雨量计作为雨量计家族中的一员已有数百年的历史。 1663年,与牛顿同时代的英国科学家雷恩和胡克创制了翻斗式自记雨量计。     

加速我国现代农业一体化创新的路径与对策

农业现代化关键在于确立现代农业一体化创新支持路径。必须通过政府适度干预,克服现代农业一体化创新过程中的市场失灵,不断完善农业一体化创新的市场和政府激励机制,积极引导现代农业一体化创新主体的行为;通过政府诱导,实现现代农业创新的制度变迁,加快我国现代农业一体化创新步伐;通过深化农村金融改革,加速现代农业一体化创新,可以提高我国现代农业国际竞争的动态优势,促进“三农”问题解决,为实现农产品金融工具化、农业金融工程化奠定基础,实现现代农业与现代农村金融良性互动和谐发展。     

河北省近40年干旱变化特征分析

根据1961—2000年河北省69个站逐月降水资料,采用Z指数作为各代表站旱涝等级划分标准,根据计算出的Z指数把旱涝情况划分成7个等级,并在此基础上计算了河北省历年干旱的严重程度和干旱发生的范围。对近40年来的资料分析表明:这一区域冬季干旱面积变化不大,春、秋季干旱面积呈减小的趋势,夏季干旱面积呈扩大趋势,年干旱面积也呈扩大趋势。     

茶树新品种‘槎湾 3 号’

 ‘槎湾3 号’是从洞庭碧螺春茶树群体种中选育成的早生,优质,高产,抗逆性较强的碧螺春茶专用茶树新品种。属灌木型,小叶类,树姿半开展,节间短,茸毛较多。制绿茶品质优,尤其适制碧螺春,适宜苏南碧螺春茶主产区种植。