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61.
浑善达克沙地植物蒸腾特征的研究 总被引:8,自引:2,他引:8
采用 L i-1 60 0型气孔仪测定了浑善达克沙地主要建群乡土植物种不同季节的蒸腾速率及其环境因子的日进程 ,结果表明 :浑善达克沙地中榆树、黄柳、圆叶桦、砂杞柳、羊草蒸腾速率的日变化均呈单峰曲线 ,而叉分蓼和楔叶茶子呈双峰曲线。同一种植物在不同样地土壤水分条件下 ,蒸腾速率不同。各植物种蒸腾速率的季节变化明显 ,7、8月份蒸腾速率高 ,6月份最低。各植物种中 ,黄柳为低蒸腾植物。回归分析表明 ,影响蒸腾速率最主要的因子为光照强度 ,其次为气温和空气相对湿度 ;蒸腾速率与各因子呈线性相关 ,其关系可用方程 Tr=a+b RH+c T+d Q表示。通过蒸腾速率的比较 ,提出了浑善达克沙地植被恢复应以建立“人工疏林草原”为主。 相似文献
62.
AIM:To investigate expression and function of CD40 ligand by peripheral blood mononuclear cells (PBMCs) in patients with systemic lupus erythematosus (SLE).METHODS:Expression of CD40 ligand by PBMCs in patients with SLE and control were examined by flow cytometric analysis before and after stimulated by phytohemagglutinin(PHA)and depressed by Dexamethasone(Dex). The correlation between expression of CD40 ligand and SLE activity index(SLEDAI) was analysed in patients with SLE.RESULTS:The expression of CD40 ligand by PBMCs in patients with active SLE was higher than that in patients with inactive SLE and control. Though the expression of CD40 ligang by PBMCs could be stimulated by PHA in three groups, it was the highest in patients with active SLE. Dex depressed the expression of CD40 ligand by PBMCs significantly in patients with SLE, but not in control. There was high positive correlation between expression of CD40 ligand and SLEDAI in patients with active and inactive SLE.CONCLUSION:Increased expression of CD40L by PBMCs in patients with SLE may play an important role in pathogenesis of SLE. 相似文献
63.
AIM:To explore the effect of brain ischemia injury on cell proliferation and nestin expression in cortex and subependymal zone (SEZ).METHODS:Using a local brain ischemia model(MCAO), BrdU positive cells of cortex and subependymal zone (SEZ), also nestin positive cells, were observed by immunohistochemistry.RESULTS:BrdU and nestin positive cells in SEZ of MCAO rats were obviously increased. In cortex, only nestin positive cells were observed.CONCLUSION:Neural stem cells in SEZ and cortex were activated after brain ischemia, it may be related with neural recovery after brain ischemia injury. 相似文献
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对山西菜田捕食性食蚜蝇优势种及对菜蚜的控制效果进行了研究,菜田常见捕食性食蚜蝇有黑带食蚜蝇,大灰食蚜蝇,斜斑鼓额食蚜蝇,野食蚜蝇,四条小食蚜蝇,短翅细腹食蚜蝇6种,以黑带食蚜蝇种群数量最大,平均占全年发生总量的36.3%,通过对食蚜蝇产卵量,卵化率,幼虫期捕食量和羽化率测试,筛选出的黑带食蚜蝇,大灰食蚜蝇,斜斑鼓额食蚜蝇幼虫对菜蚜均有较强的捕食能力,其中黑带食蚜蝇为山西菜田菜蚜捕食性食蚜蝇优势种,用黑带食蚜蝇三龄幼虫对菜蚜进行防治试验,结果以1:180防效最佳,72h后控制效果达93.5%。 相似文献
66.
AIM:To explore the expressive profile of nestin protein in the focal ischemic brain and to study the recovery mechanism of brain focal infarct.METHODS:Cellular morphology,time-course and distribution pattern of nestin positive response were immunohistochemically examined in different brain regions of 36 adult male SD rats. RESULTS:Nestin positive response of different brain regions in sham operated rats was present in small- and micro-vasculartures and the third ventricle bottom and ependyma. A large number of nestin positive cells were detected in ischemic brain, and were more remarkable in the cortical areas of parietal lobe and preoptic area as well as ischemic caudoputamen. Stellate nestin positive cells were located in the deep layer of ischemic cortex, but fibrillary cells were located in the shallow layer. Nestin positive cells in the ischemic caudoputamen showed the same changes of morphology as those cells in the deep layer of ischemic cortex. Morphological and number alterations of nestin positive cells were the most remarkable at 1 weeks post-ischemia, which showed more hypertrophy and proliferation in morphology, and a marked increase in number was present in the ischemic cerebral cortex and the ischemic caudoputamen. These alterations of nestin positive cells persisted up to 6 weeks post-ischemia, and then, the nestin positive response in the ischemic brain decreased gradually.CONCLUSION:Focal cerebral ischemia induces nestin re-expression on reactive astrocytes, which may be very important to the self-recovery of cerebral infarct. 相似文献
67.
AIM:To examine the effect of external counterpulsation(ECP) on renin-angiotensin system(RAS) and hemodynamics in dogs with myocardial ischemia and their relationship. METHODS:Acute myocardial ischemia was induced by occluding the left anterior descending of the dogs. The local renin activity, angiotensin Ⅱ(AngⅡ) level, angiotension-converting enzyme(ACE) activity were tested by biochemical methods and hemodynamics was recorded by a 8-channel physiological recorder.RESULTS:Ischemia could actiivate renin,ACE and AngⅡ in cardiovasculature and ECP reduced them except for renin in ischemic myocardium. Ischemia also could activate RAS in lung and kidney, which play an important role on circulating RAS, and ECP reduced them. Furthermore, ECP could improve hemodynamics and there existed a close relationship between local AngⅡlevel and hemodynamics. CONCLUSION:ECP can reduce local RAS and improve hemodynamics in dogs with myocardial ischemia, which might be one of mechanisms underlying the protective effect of ECP on ischemic myocardium. 相似文献
68.
AIM: To study the effects of tetrandrine(Tet) and fructose-1, 6-diphosphate(FDP) on the elevated intrasynaptosomal [Ca2+]i induced by excitatory amino acids(EAA). METHODS: A rapid method for preparing synaptosomes was used, and intrasynaptosomal free calcium([Ca2+]i) was measured by using the fluorescent indicator quin-2. RESULTS: L-glutamate(Glu, 100 μmol/L), aspartate(Asp, 100 μmol·L-1), N-methy1-D-aspartate(100 μmol/L) and Glu(50 μmol/L) plus Asp(50 μmol/L) all elevated intrasynaptosomal [Ca2+]i in a dose-dependent manner. Pretreatment with Tet(10, 30, 60 μmol/L), FDP(15, 30, 75, 150 μmol/L), MK-801(10, 20 μmol/L) and Tet(15, 30 μmol/L) plus FDP(15, 30 μmol/L) all attenuated the increase in intrasynaptosomal [Ca2+]i induced by EAAs mentioned as above in a dose-dependent manner, and the effect of Tet plus FDP was most significant. CONCLUSION: Both Tet and FDP inhibited a rise in intrasynaptosomal [Ca2+]i induced by EAAs, which may be one of mechanisms that Tet and FDP pretect cerebral tissues against ischemia injury. 相似文献
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70.