荔枝生产相关的水分生理指标远程监测研究   总被引：2，自引：0，他引：2  

赵晓勤  宋世文  李建国  谢世恭  王泽槐  李楚彬  季作梁 《果树学报》2005,22(6):644-648

利用植物远程监测系统对荔枝园中的大气温湿度、土壤湿度、光照强度、大气蒸汽压差(VPD)等环境因子和茎干直径微变化、果实生长、叶片温度等树体生理指标进行了监测,发现该系统能准确及时并无伤害地记录他们的实时和周期性变化。据获得的数据初步表明,当果实处于快速膨大期,主茎的加粗生长明显缓慢,一旦果实采收后,茎干加粗生长则有一个迅速上升的变化;当土壤湿度高于33%(v/v)时,主茎的生长受到明显的抑制;VPD白天上升,夜间下降,当夜间VPD始终高于0,就形成所谓的“夜间干燥”,VPD的这种变化对荔枝主茎和果实的生长以及叶气温差(LATD)都有较大的影响,如主茎和果实的日间收缩量随VPD的增大而增大,夜间空气干燥不但抑制了主茎生长,也使日最大LATD下降。据此认为,果实和茎干的生长之间存在竞争关系,土壤湿度过高或者夜间空气干燥对荔枝的生长不利。  相似文献   

论个性化的大学英语课程设置     

谢德琼 《四川畜牧兽医学院学报》2005,3(4):133-136

讨论了目前大学英语课程设置单一的现状，并分析其形成原因。文章以ESP研究关于需求分析的理论为依据，提出大学应根据学生的实际需要、新时期国家和社会对人才培养需要，区别不同层次、不同程度、不同专业学生的需求，而专门设置一系列大学英语课程。说明了设置个性化的大学英语课程的理由和好处。  相似文献   

Relationship between the intracellular calcium concentration changes and left ventricular hypertrophy and function in the spontaneously hypertensive rats     

XU Rui  ZHANG Yun  ZHANG Mei  GE Zhi-ming  CHEN Wen-qiang  LI Xiu-chang  CAI Heng  ZHU Hui 《园艺学报》2003,19(5):642-644

AIM:To elucidate the relationship between the intracellular calcium concentration changes and left ventricular hypertrophy and function in the spontaneously hypertensive rats (SHR).METHODS:Intracellular free calcium concentrations were measured by Fura 2 methodology and left ventricular function quantitated by cardiac catheterization in 20 SHR aged 10, 22, and 34 weeks and 20 age-matched Wistar-kyoto (WKY) rats.RESULTS:(1) The systolic blood pressure(SBP), intracellular calcium concentrations and left ventricular mass / body weight index (LVM/BW) were significantly higher in all three age groups of SHR than the corresponding groups of WKY; (2) Compared with age-matched WKY groups, the peak left ventricular pressure descending rate(-dp／dt_max) decreased while left ventricular relaxation time constant (τ)increased significantly in SHR aged 22 and 34 weeks. The peak left ventricular pressure ascending rate(dp／dt_max) and the left ventricular contractility index were significantly increased only in the 34 weeks SHR; (3) Intracellular calcium concentrations showed a positive correlation with LVM/BW,SBP,-dp／dt_max and τ(r=0.47-0.83,P<0.01)and a negative correlation with dp／dt_max and the left ventricular contractility index (r=-0.46,P<0.05 and r=-0.81, P<0.01).CONCLUSION:Intracellular calcium overload is one of the potential mechanisms in the induction of left ventricular hypertrophy as well as of systolic and diastolic dysfunction.  相似文献   

Effect of cyclophosphamide on proliferation and apoptosis of rat mesangial cells in vitro     

XIE Tong  WU Ping  TANG De-shen  JIANG Li-ming 《园艺学报》2003,19(3):391-393

AIM:To investigate the effect of cyclophosphamide(CTX) on proliferation and apoptosis of mesangial cells(GMC) of rat in vitro. METHODS:GMC proliferat ion was detected by MTT method,GMC apoptosis was examined by inverted microscopy for phase-contract and fluoroscopy and flow cytometry analysis.The levels of Fas and Bcl-2 were also detected by immunohistology. RESULTS:The proliferation of GMC were inhibited by CTX, methylprednisolone(MP), low molecular weight heparin(LMWH). Apoptosis of GMC was induced by CTX, the apoptosis rate of GMC was 8.2%, and the Fas level was increased. CONCLUSION:CTX could inhibit proliferation and induce apoptosis of GMC possibly by enhancing the Fas level.  相似文献   

‘三棱榄''橄榄果实香气成分分析   总被引：7，自引：1，他引：7  

钟明  陈玉芬  甘廉生  蔡时可 《园艺学报》2003,30(6):757-761

1 材料与方法选取广东优良鲜食橄榄品种‘三棱榄’,2001年12月6日采样,采用固相微萃取法(SPME)富集香气成分(鲜橄榄果肉于15℃下捣碎后取样1.0 g放入4 mL聚四氟乙烯硅橡胶垫密封螺口玻璃瓶中,插入100μm聚二甲基硅氧烷纤维头于室温25-30℃顶空取样2 h),用美国Finnigan TRACE GC-MS气相色谱-质谱联用仪进行分析。气相色谱柱为DB-1弹性毛细管柱30 m×0.25 mm,载气为He(99.99％),流速1.0mL/min。程序升温从40℃开始先保持10 min,后以2℃/min的升温速率升至150℃保持10 min。质谱条件:电子能量70 eV,离子源温度250℃,质量范围35-450 aum,不分流进样。2002年12月18日采样重复分析。  相似文献   

Expression and role of CD134 and NF-κB in renal tissue of lupus nephritis     

ZHOU Yan-bin  YE Ren-gao  XIE Can-mao  XU Han-shi  GUAN Wei-ming  YANG Xiao  YANG Nian-sheng 《园艺学报》2003,19(9):1221-1223

AIM:To investigate the role of CD134 (OX40) and NF-κB in the pathogenesis of lupus nephritis (LN).METHODS:Renal in situ CD134 and NF-κB expression were examined in 40 biopsy specimens from LN patients by immunohistochemistry and microwave-based immunohistochemistry, respectively. The relationship between expression of CD134 and NF-κB was analyzed.RESULTS:The expression of glomerular and tubular CD134 and NF-κB in LN were higher than that in normal control, especially in class Ⅳ LN, where there was intense staining of endothelial cell, distal tubules, and interstitial mononuclear cell. The CD134 expression of glomerular and tubular was closely related to NF-κB expression, respectively (r=0.5542, P＜0.05;r=0.6279, P＜0.05). CONCLUSIONS:The abnormal expression of costimulatory molecule CD134 was well evidenced in LN. Strong expression of renal in situ NF-κB was likely mediated by CD134 signal pathway, which may play an important role in the pathogenesis of LN.  相似文献   

Effect of fibronectin on proliferation and collagen synthesis in cardiac fibroblasts from spontaneously hypertensive rats     

XIE Liang-di  HAN Ying  CHEN Shui-long  WANG Hua-jun  XU Chang-sheng 《园艺学报》2003,19(12):1658-1661

AIM:To investigate the effects of fibronectin (FN) on the proliferation and collagen synthesis in cultured rat cardiac fibroblasts (CFb) derived from SHR (CFb_SHR) and WKY (CFb_WKY). METHODS:CFb derived from 12-week-old spontaneously hypertensive rat (SHR) and WKY was cultured by outgrowth of tissue block. Cell proliferation of CFb was measured by cell number counting and[³H]-TdR incorporation using 24-well plates pre-coated with 5 μg/cm² of FN. Collagen synthesis was determined by [³H]-proline incorporation. RESULTS:As compared with control, the cell number of fibroblasts derived from SHR and WKY were significantly increased to 163.75% and 170.42% respectively after 72 h incubation with FN in the presence of 0.4% FCS from a intial cell density of 1×10⁴ cells/mL. DNA synthesis of CFb was markedly promoted by FN. FN induced an increased in [³H]-proline incorporation in both CFb_SHR and CFb_WKY. CONCLUSION:FN is able to promote cell proliferation and collagen synthesis of CFb derived both from SHR and WKY.  相似文献   

孔雀河流域绿洲生态支持系统调控模式研究   总被引：8，自引：0，他引：8  

王铁成  谢红彬  贾宝全 《干旱区资源与环境》2002,16(3):7-11

生态环境用水量的减少是孔雀河流域近 50年来现代绿洲环境退化的主要原因 ,维持生态与社会经济的合理用水比例是绿洲系统持续发展的前提。以此为基础 ,本文采用水资源承载力的方法探讨了绿洲生态支持子系统和社会经济子系统优化调控模式 ,最后就配置方案及发展模式的可行性进行了分析  相似文献   

转 Bt基因抗虫棉对棉大卷叶螟抗性的研究   总被引：7，自引：0，他引：7  

王厚振  肖云丽  郑成民  王书友  孟妍遐 《中国植保导刊》2002,22(3):21-22

:转Bt基因抗虫棉对棉铃虫有很好的抗性,对棉大卷叶螟(SyleptaderogataFabricius)的抗性未见报道。作者研究表明,棉大卷叶螟在棉田为聚集分布型,低龄幼虫有集中为害习性;抗虫棉对其有很好的抗性,平均虫株率为2.2%,较常规棉中棉所12降低96.6%;百株虫量为133.8头,较常规棉降低88.4%。  相似文献   

玉米疯顶病种子传播研究   总被引：2，自引：0，他引：2  

杨建国  金晓华  谢爱婷  王晓鸣  朱振东 《中国植保导刊》2002,22(6):3-4

连续3a对不同来源的玉米种子,利用显微镜镜检和试种观察植株发病显症的方法,检测其携带玉米疯顶病病菌状况。结果表明,病株病穗籽粒、病株健穗籽粒、病田健株籽粒都有较高的带菌率。因此,病菌随种子调运远距离传播是造成各地病害突发的主要原因。  相似文献