真菌诱导型植物表达载体pBP的构建

根据prp1-1启动子序列设计并合成了一对引物,通过PCR扩增的方法从马铃薯基因组中扩增到了病原诱导的prp1-1启动子,并将其克隆到PGEMT-Easy载体上,然后进一步克隆到植物表达载体pBI101.2上,构建了病原诱导型基因表达载体pBP.     

Distribution of the cross-correlations of squared residuals in ARIMA models

ABSTRACT The distribution of the cross-correlations of squared residuals from Box-Jenkins models is considered in very general conditions, and the asymptotic distribution is derived. A test for a lagged relationship in volatility for economic time series under instantaneous causality is proposed, and its empirical behaviour is studied. An example involving the international stock market's volatility is studied, and an interesting result is observed.     

益气补肾活血法治疗小儿哮喘的临床研究

探讨益气补肾活血法对支气管哮喘患儿血内皮素-1(ET-1)、一氧化氮(NO)和内皮细胞(CEC)变化的影响.应用放射免疫法、硝酸还原法和Hladovec法对加服中药的100例支气管哮喘患儿于急性期、恢复期等分别检测血ET-1、NO和CEC.与未加服中药的支气管哮喘患儿比较,其恢复期和1年后血ET-1、NO和CEC水平明显下降,发作次数明显减少,有显著性差异.益气补肾活血中药可降低支气管哮喘患儿血ET-1、NO的合成,减轻肺血管内皮细胞的损伤.对防治小儿支气管哮喘有效.     

一类热传导方程的H1-Galerkin混合有限元分析

采用H1 Galerkin混合有限元方法对一类热传导方程的初边值问题,提出了半离散H1 Galerkin混合有限元格式,通过误差分析,得到H1 Galerkin混合有限元解与真解的L2模和H1模的最优阶误差估计.     

Saddlepoint approximations for some models of circular data

In this article we provide saddlepoint approximations for some important models of circular data. The particularity of these saddlepoint approximations is that they do not require solving the saddlepoint equation iteratively, so their evaluation is immediate. We first give very accurate approximations to P-values, critical values and power functions for some optimal tests regarding the concentration parameter under wrapped symmetric α-stable and circular normal models. Then, we consider an approximation to the distribution of a projection of the two-dimensional Pearson random walk with exponential step sizes.     

PAI-1、t-PA/PAI-1比值与急性血管事件的相关性研究

目的了解血浆t-PA、PAI-1和t-PA/PAI-1比值在急性血管事件中的变化和意义。方法对于健康对照组、陈旧性和急性血管事件组分别采用ELISA法检测t-PA和PAI-1活性,计算t-PA/PAI-1比值。结果急性血管事件组血浆t-PA、PAI-1明显增高、t-PA/PAI-1比值明显降低,与其它两组相比P<0.01;陈旧性血管事件组血浆PAI-1增高,与对照组相比P<0.05;t-PA升高和t-PA/PAI-1比值降低,与对照组相比无显著差异。结论血浆t-PA和PAI-1水平与血管内皮稳定性密切相关。PAI-1增高和t-PA/PAI-1比值降低的程度在急性血管事件发生中起着重要的作用。监测PAI-1和t-PA/PAI-1比值这两项指标,在心脑血管事件的预防和治疗方面具有重要意义。     

环孢菌素的提取与菌株选育

环孢菌素是一种真菌的次级代谢产物。菌种经Co60-γ射线、氯化锂,氯化锂+紫外线,快中子等方法处理后,产量提高了4～5倍,并利用粗提物作了抑菌实验。     

Doubly periodic non-homogeneous Poisson models for hurricane data

Non-homogeneous Poisson processes with periodic claim intensity rate have been proposed as claim counts in risk theory. Here a doubly periodic Poisson model with short- and long-term trends is studied. Beta-type intensity functions are presented as illustrations. The likelihood function and the maximum likelihood estimates of the model parameters are derived.Doubly periodic Poisson models are appropriate when the seasonality does not repeat exactly the same short-term pattern every year, but has a peak intensity that varies over a longer period. This reflects periodic environments like those forming hurricanes, in alternating El Niño/La Niña years. An application of the model to the data set of Atlantic hurricanes affecting the United States (1899–2000) is discussed in detail.