不同出手参数组合下对空心投篮命中率的影响

Today,with the rapid development in scienceand technology,competition in different trade be-comes vehement day by day,especially in sports.Basketball is one of the most vigorous growingsports.It has been shown that basketball sportsand matches prevail in all over the world.Shootingis the main attacking technology in basket sport,andit is alsothe only means to get score.Graspingthe shooting technique and making progress in hitrate are quite i mportant to win the match.There are many kinds of s…     

荔枝、龙眼梢果蛀虫及两种细蛾综述

本文记述荔枝龙眼梢果蛀虫种类,比较了两种细蛾的名称,生物学和形态特征。     

玫瑰叶片愈伤组织诱导的初步研究

试验以玫瑰叶片为试材，在四种培养基上进行愈伤组织诱导，结果发现MS+2.4-D2.0mg/L+6-BA1.0mg/L+水解乳蛋白250mg/L的培养基诱导率最高，达到100%.     

Inducing apoptosis of cancer cell and inhibiting mice’s malignant tumour growth by magnetic fields

It was found that the growth of malignant tumour in mice was inhibited and the ability of immune cell’s dissolving cancer cells was enhanced by ultralow frequency (ULF) pulsed gradient magnetic field. The DNA contents of nuclei decreased which indicated that magnetic field can block DNA replication and mitosis of cancer cells. It was observed that magnetic field inhibited the cancer cell’s metabolism, lowered its malignancy, and restrained its rapid and heteromorphic growth. The morphology properties of Programmed Cell Death (PCD) of the cancer cells of the treated group by magnetic field was observed for the first time. The heterochromatin condensed and coagulated together along the nuclear membrane; the endoplasmic reticulums expanded and fused with the cellular membrane; many apoptotic bodies which were packed by the cellular membrane appeared and were devoured by the lymphocytes and plasma. Foundation item: Supported by the National Natural Science Foundation of China Biography: ZHANG Hu-sheng(1938-), male, Professor     

丙烯酰胺和丙烯酸的热引发共聚反应条件的优化探索

研究了丙烯酰胺和丙烯酸的热引发共聚反应的条件，主要探讨了丙烯酰胺和丙烯酸的配比、转化率、吸水率、分子量以及反应液中阻聚剂O2是否除去对聚合率的影响．结果表明，单体含量为20％、单体配比AM／AA为3／2、聚合时间为3h时，丙烯酰胺和丙烯酸热引发聚合的聚合率和吸水率都较高，聚合产物分子量也较大．     

酸化理论在玉米笋罐头加工中的应用

“石多１号”玉米笋ｐＨ值为５．８～６．０、ａｗ＞０．８５，属低酸性蔬菜食品，加工罐头时须用高温杀菌，产品营养损失大。本研究以酸化理论为基础，通过对玉米笋加酸预煮及调酸装灌，使之成为酸化低酸性食品即ｐＨ≤４．６、ａｗ＞０．８５，杀菌方式采用巴氏杀菌，降低了杀菌强度Ｆ值，较好地保持了产品的色、香、味、形及脆性     

Reproductive effort of short shoots in silver birch (Betula pendula Roth)

Summary The degree of autonomy was estimated for generative short shoots of silver birch by defoliating them after leaf flush. Defoliation reduced both final length (4%) and weight (18%) of female inflorescences. Short shoots are thus reproductively semi-autonomous modules of silver birch.Acknowledgments. We wish to thank the Archipelago Research Institute of the University of Turku for working facilities, and E. Haukioja and T. Valanne for advise during the field work. The work was financially supported by the Academy of Finland.     

芦苇苗端营养生长阶段的结构变化及淀粉消长规律

芦苇营养苗端在发育过程中始终保持原套原体结构，原套由两层细胞组成。叶原基发生的最初标志是对原基发生位点的两层原套细胞首先进行平周分裂．叶舌发生始于苗端倒数第１０间隔期幼对内侧，由幼叶原表皮细胞及其内侧的基本分生组织细胞共同发育而来。最初的腋芽原基发生于苗端倒数第３间隔期幼叶叶腋内．发生早期出现壳状区结构．壳状区原分生组织表面两层细胞由两层原套细胞衍生而来，不仅能进行垂周分裂，还能进行平周分裂。休眠前夕，芦苇营养苗端的原始细胞区还可通过ＰＡＳ加铁矾苏木精染色显示出来．芦苇营养苗端的淀粉消长规律与其分区结构以及苗端的器官发生均有密切的相关性．越冬前夕，芦苇冬芽生长锥、幼叶中所积累的大量淀粉粒及幼叶中所积累的油滴均有助于增强冬芽的抗寒性．     

玻璃粉创伤棉花茎尖分生组织遗传转化的研究

评估玻璃粉创伤棉胚茎尖分生组织的转化效率及初步建立其遗传转化体系。高速涡旋的玻璃粉创伤棉胚茎尖分生组织,利用农杆菌介导法将报告基因gusA导入棉花,GUS组织化学染色后观察棉胚转化情况,探讨不同转化条件对转化的影响。结果表明：0。2g玻璃粉创伤棉胚,茎尖分生组织的较多细胞被转化,成活12株幼苗,较适宜。涡旋90S转化条件下获得2株GUS阳性苗,涡旋时间越长茎尖分生组织创伤程度越严重,能提高转化效率,但成苗量降低。此外．转化效率受菌液浓度及菌种的影响,OD600为0．8的农杆菌LBA4404菌液侵染棉胚,较多细胞能表达gusA的活性且表达水平较高,而被农杆菌GV3101侵染后的棉胚染色效果较差。     

红毛草Rhynchelytrumrepens（Willd.）C.E.Hubbard的繁殖特性*

从繁殖生态学的角度对红毛草Rhynchelytrum repens （Willd．）C.E．Hubbard 的繁殖特性进行了研究。采用盆栽试验与发芽试验,分别研究了4种不同种植密度下红毛草的资源分配情况和4年内红毛草的种子寿命与萌发情况。结果显示：①盆栽试验中,低密度种植红毛草的单株总生物量、茎叶生物量、根生物量与根冠比高于高密度种植差异达显著水平（p＜0.05）;花的生物量在相对低密度下低于高密度的量,差异显著（p＜0.05）;②高密度种植红毛草的 RE （Reproductive effort）值大于低密度种植的 RE 值,而且差异显著（p＜0.05）,显示红毛草在生长胁迫下分配更多的资源到繁殖器官中;③发芽试验中,红毛草种子在高温胁迫下（45℃）发芽率显著下降（p＜0.05）,但仍维持在一定的水平（30.2％）,显示了红毛草对高温的适应能力;④红毛草种子的发芽率在贮藏两年后开始显著下降（p＜0.05）,但在贮藏的第四年仍维持在一定的水平（11.1％）,说明红毛草有较长的种子寿命;⑤红毛草种子发芽迅速,在发芽的第1天就开始萌动,发芽的高峰期出现在发芽的第2-3天。以上繁殖特性均与红毛草能够成为先锋植物密切相关。