细叶杜香挥发油抑茵和杀菌作用的研究

应用水蒸气蒸馏法提取细叶杜香挥发油,采用丙酮溶剂溶解杜香挥发油,以青霉菌、酵母菌和金黄色葡萄球菌作供试菌种,在实验中观察不同浓度的细叶杜香挥发油溶液对不同菌种的作用,研究其抑茵和杀菌作用。     

东北羊草草原金狗尾草种群生长与环境关系的研究

研究了东北羊草草原金狗尾草种群的生长,并利用灰色系统理论考察了环境因子对金狗尾草生长的作用规律．结果表明：金狗尾草的生长具有明显的季节进程,八月份生长最快,其生物量为963g／m2．温度、活性有机质、水解氮、含水量、速效钾具有较大的灰色关联度,其中温度、活性有机质、水解氮是金狗尾草生长的优势因子．PH、有效磷、电导率关联度相对较小,是限制因子．金狗尾草生长的最优模型为y=2．9592x1＋47．815212x2＋3．6702x3-91．4113     

Chemotherapy and immunotherapy of malignant glioma: molecular mechanisms and clinical perspectives

Despite the considerable progress in modern tumor therapy, the prognosis for patients with glioblastoma, the most frequent malignant brain tumor, has not been substantially improved. Although cytoreductive surgery and radiotherapy are the mainstays of treatment for malignant glioma at present, novel cytotoxic drugs and immunotherapeutic approaches hold great promise as effective weapons against these malignancies. Thus, great efforts are being made to enhance antitumoral efficacy by combining various cytotoxic agents, by novel routes of drug administration, or by combining anticancer drugs and immune modulators. Immunotherapeutic approaches include cytotoxic cytokines, targeted antibodies, and vaccination strategies. However, the success of most of these experimental therapies is prevented by the marked molecular resistance of glioma cells to diverse cytotoxic agents or by glioma-associated immunosuppression. One promising experimental strategy to target glioma is the employment of death ligands such as CD95 (Fas/Apo1) ligand or Apo2 ligand (TRAIL). Specific proapoptotic approaches may overcome many of the obvious obstacles to a satisfactory management of malignant brain tumors. Received 8 March 1999; received after revision 27 May 1999; accepted 14 June 1999     

甘蓝型杂交油菜"蜀杂9号"种子纯度的RAPD鉴定

通过50个随机引物对“蜀杂9号”亲本进行RAPD扩增,选出了两个能在父、母本间产生多态性扩增的随机引物S18和S31,在杂种F,代中验证了它们的特异性和稳定性,证明随机引物S18和S31能分别在F1代中稳定扩增出父本和母本的特异标记片段S18750与S31550．对该引物的RAPD-PCR的反应体系优化后,对“蜀杂9号”父、母本和杂种F1代的单株进行了随机检测,结果表明这两个RAPD标记配合使用能稳定可靠地鉴定甘蓝型杂交油菜“蜀杂9号”种子的纯度．     

关于Fourier 级数的L′收敛与L′逼近

本文引进复广义单调序列的概念,指出它是文中复拟单调序列概念的一个推广.我们讨论了具有复广义单调 Fourier 系数函数的 L′收敛与 L 逼近的问题.在较弱的条件下建立了与文相应的定理,从而推广了 stanojevic 的定理和谢庭藩在文中的结果.     

原生质体膜的发育特征

通过对黑麦(Secale Cerenle.L.)、向日葵(Helianthus Annuus.L)幼苗叶片的分段取材,利用扫描电镜技术研究了植物叶肉原生质体质膜的发育特征。我们发现(从叶片基部开始到叶尖)双子叶、单子叶植物原生质体的质膜发育具有相似的规律性。原生质体幼龄时,质膜表面出现了各种突起组成的球状“微区”,随着细胞的成熟,质膜表面逐渐变得多皱,进而光滑,其方式在单、双子叶植物略有不同。本文详细地描述了质膜的形态发育特征,同时讨论了这些特征与叶肉原生质体其它特征的关系。     

FINITE RIODAN MATRIX AND RIODAN GROUP

l introductionIn 1991, L. Shapiro and his co -- authorsI2] gave the following.Definition l.l Let L = (l.i),.j >0 be a infinite matrix with entries that belong to the fieldC of complex numbers, and letbe the GF of the i,, column of L. Then L is called a Riodan matrix ifwb e reandsuch that g(x) and f(x) belong to the ring of formal power series C[x] and f, /0.The Riodan matrix has many applications to combinatoricsll]--14]. For example, in 1997,N. Asamoah[I] dealt with the problem of latt…     

虎杖中游离蒽醌衍生物的提取及利用

本文研究植物虎杖中游离蒽醌衍生物的提取及其作为酸碱指示剂、医药中间体、食用色素等的用途。     

干旱胁迫下麻疯树幼苗根和叶的生理应答变化

采用高浓度聚乙二醇胁迫模拟干旱的方法,研究比较了麻疯树幼苗不同组织根和叶对胁迫的应答变化.结果表明,麻疯树幼苗根和叶对胁迫都产生明显应答,二者组织中相对含水量都明显下降,活性氧、可溶性糖、脯氨酸和丙二醛的含量持续增加,抗坏血酸含量呈现先增加后降低的趋势,但同期上述指标变化幅度都不一样.在整个胁迫期间,根和叶的抗氧化酶系统变化不一致,超氧化物歧化酶、过氧化氢酶、过氧化物酶和抗坏血酸还原酶活性的应答启动时间、活性变化幅度和应答持续时间也呈现一定的差异.但是,在整个胁迫处理期,根和叶组织中上述各酶活性均维持高于对照的水平.     

一维非线性奇异边值问题的有限元方法

使用对称有限元方法，研究了奇异非线性两点边值问题有限元解的收敛性，给出了最佳阶的误差估计