赖草PMC细胞融合现象的研究

本文报道了赖草（Ｌｅｙｍｕｓｓｃａｌｉｎｅ）花粉母细胞（ＰＭＣ）的细胞融合现象，结果表明，细胞融合主要发生在间期，终变期。间期发生细胞融合主要是细胞质转移，因此不会产生明显的遗传学效应。终变期细胞融合主要是染色体的迁移，其细胞遗传学效应主要是造成供体和受体细胞的染色体数目变化，从而产生了非整倍体配子。文章还对细胞融合产生的原因进行了讨论。     

微核率、染色体畸变率与重金属离子的关系初探

蚕豆根尖微核率（ＭＣＷ）、染色体畸变率（ＣＡＦ）与重金属离子间有明显的效应－剂量关系。在较低剂量情况下，两者呈直线回归；在较高条件下，据本实验（采用Ｐｈ和Ｈｇ）结果，随处理浓度的提高，其关系曲线为“Ｍ”形。通过对聚丙烯酸胺过氧化物同功酶电泳的结果及前人成果分析，认为这与同工酶变化及抗性酶活性有关。另外，对于Ｐｂ、Ｈｇ处理，间期ＭＣＮＦ，中期ＣＡＦ和后期ＣＡＦ随浓度的升高并不同步达到最大值，即中期ＣＡＦ与剂量的线性区段长于其他两者。     

农村社会养老保险制度要创新

搞好农村社会养老保险工作,实现农村社会和谐化,是完善社会保障体系、全面建设社会主义新农村的重要内容,也是应对人口老龄化的一个紧迫任务。我国80%的人口居住在农村,要实现十六届六中全会提出的到2020年构建社会主义和谐社会的任务目标,必须下大力气抓好农民的养老问题。农村社会养老保险工作,应以提高农民生活质量、建设社会主义新农村和构建农村社会和谐化为重点,尽快建立与经济社会发展和农民生活水平相适应的新型农村社会养老保险制度。当前,应根据经济社会发展和农民年老后基本生活需要,通过“跳跃式”的方式加快政策制定步伐,应对…     

高梁──苏丹草杂交种干物质积累分配及光合性能的研究

研究表量，高粱—苏丹草杂交种的单株生物量高，其干物质积累量高于甜高粱杂交种和粒用高粱杂交种．各器官的干物质积累量以分蘖茎为最高．并且增长迅速．主茎和分蘖茎的干物质分配率在生育后期无负值．高粱—苏丹草杂交种获得较高生物量的原因是分蘖性强，致使产生较高的ＬＡＩ和ＣＧＲ．     

用8—羟基喹啉化学修饰电极测定人体痕量铊

本文用强吸附法研制了8—羟基喹啉化学修饰电极,并将其应用于人体痕量铊的分析。该方法具有较高的灵敏度和较好的选择性。检出下限为5×10-11mol·l-1,实测人体样品铊的回收率为94±44%,变异系数CV=46%。     

Regression analysis of case-cohort studies in the presence of dependent interval censoring

The case-cohort design is widely used as a means of reducing the cost in large cohort studies, especially when the disease rate is low and covariate measurements may be expensive, and has been discussed by many authors. In this paper, we discuss regression analysis of case-cohort studies that produce interval-censored failure time with dependent censoring, a situation for which there does not seem to exist an established approach. For inference, a sieve inverse probability weighting estimation procedure is developed with the use of Bernstein polynomials to approximate the unknown baseline cumulative hazard functions. The proposed estimators are shown to be consistent and the asymptotic normality of the resulting regression parameter estimators is established. A simulation study is conducted to assess the finite sample properties of the proposed approach and indicates that it works well in practical situations. The proposed method is applied to an HIV/AIDS case-cohort study that motivated this investigation.     

A Conditional Approach for Regression Analysis of Longitudinal Data with Informative Observation Time and Non-negligible Observation Duration

Recently, there has been a great interest in the analysis of longitudinal data in which the observation process is related to the longitudinal process. In literature, the observation process was commonly regarded as a recurrent event process. Sometimes some observation duration may occur and this process is referred to as a recurrent episode process. The medical cost related to hospitalization is an example. We propose a conditional modeling approach that takes into account both informative observation process and observation duration. We conducted simulation studies to assess the performance of the method and applied it to a dataset of medical costs.     

A Qualitative Case Study on Recovery and Personal Growth in Korean Drug Addicts

ABSTRACT

In recent years, crimes related to drug smuggling and production have gradually increased in Korea. This qualitative case study explores the experiences of Koreans recovering from drug addiction and identifies specific details and mechanisms of recovery. For this purpose, participants were selected based on criteria such as engaging in social activities after recovery from addiction for 3 years or more. Next, one-on-one in-depth interviews were conducted with five voluntarily consenting participants. Data were analyzed using the within-/cross-case analysis suggested by Creswell. Substantial personal growth took place in the recovery process for drug addicts. Nineteen themes were identified as manifestations of personal growth through within-case analysis. Four common themes were then derived through cross-case analysis. These four common themes were “reconnection with reality,” “embracing the essence of one's own existence,” “reconstructing oneself in social relations,” and “self-love.” The study's results suggest that a recovery program needs to be developed wherein the program not only enables drug addicts to reflect on their current existence but also allows them to develop their specific coping skills. Future research should be broadened to consider the social support mechanism and viewpoints of people including family and local community members in close contact with drug addicts.     

Racial and Ethnic Differences in Experiencing Parents’ Marital Disruption During Late Adolescence

Using panel data from 9,252 adolescents in the National Education Longitudinal Study, this study finds that among children who experience parents’ marital disruption during late adolescence, European, Asian, and African American adolescents exhibit wider and greater maladjustment both before and after the disruption than their Hispanic American counterparts. This finding lends general support to the hypothesis of prevalence of disadvantages, although it is less consistent with the hypothesis of prevalence of divorce. Moreover, whereas Asian American adolescents in predisrupted families are more vulnerable to a shortage of family social resources, their African American peers are affected more by a shortage of financial/human resources. Finally, postdisruption effects on non‐Hispanic American adolescents are either completely or partially attributable to predisruption factors.     

企业政治资源的经济回报: 基于江苏常州企业调查数据的实证分析

基于2009年江苏常州企业和企业家调查数据的实证分析显示,企业拥有的各种政治资源有利于企业获得政府的优惠政策扶持、土地审批以及政府合同.具体而言:来自企业所有成员的政治资源对企业获得各种经济回报有更强的解释力,这说明不应忽略员工政治资源的作用;企业家的政治参与(为各级人大代表、政协委员或政府顾问参事)要比企业家政治面貌(中共党员或民主党派成员)的作用更为明显;企业规模的作用并不总是有效的,而企业历史以及加入行业协会这些因素则无显著作用.