泥土中植物花粉的提取与检验

目的建立泥土中植物花粉的提取和检验方法。方法用去二甲苯、18%盐酸溶液处理提取泥土中的花粉 ,然后用扫描电镜进行检验。结果从不同的泥土中检出不同花粉。结论本方法能有效分离提取泥土中花粉。对其它混合物中花粉的提取有参考价值。本文介绍一种泥土中花粉提取的简捷方法 ,以及利用扫描电镜 /能谱仪对提取的植物花粉进行检验的方法。     

仔猪睾丸组织体外培养方法的建立

以30日龄仔猪睾丸组织块为培养对象,应用飞利普TECNAI10电子显微镜对培养前后的生精细胞类别进行了观察,对培养后的组织块进行生精细胞分化程度鉴定,建立了仔猪睾丸组织生精细胞爬片体外培养模型。培养前后电镜观察及HE染色结果显示,培养前细胞种类主要有2种:支持细胞和精原细胞,有少数几个初级精母细胞;培养第20 d的睾丸组织块HE染色观察到3个精子细胞,电镜观察到2个精子细胞。证实,在没有添加睾酮的情况下,此培养体系能够提供睾丸组织块生精细胞分化所需要的条件,使非精子细胞类生精细胞减数分裂为精子细胞。     

胚兔牙囊发育生物行为的组织形态学观察

研究胚兔的牙囊发育生物行为与人的牙囊发育是否相似 ,为人口腔疾病的研究提供模拟实验动物模型 ,采用光镜、电镜及激光扫描共聚焦显微镜对 4 3只胚兔的牙囊发育过程进行形态学观察。结果显示 ,牙囊来源于外胚间质 ,通过胚胎诱导形成牙支持组织 ,分化产生成牙骨质细胞、成骨细胞、成纤维细胞 ,形成牙骨质、固有牙槽骨、牙周韧带及其基质 ,对牙齿发育阶段具有保护和稳定作用 ,调控未来形成的牙周结构 ,在早期发育阶段首先出现 ,与人牙囊发育基本相似 ;最终牙囊在牙冠的顶部形成索引带 ,诱导继承牙萌出 ,在牙冠的根部形成牙支持组织 ,一部分牙囊细胞有程序性细胞死亡 ,以维持牙囊发育期内环境的生理平衡     

A Model for Female-Perpetrated Domestic Violence

Child abuse often coexists with intimate partner violence. However, limited studies incorporate both phenomena in a single study. Moreover, the examination of female-on-male violence is an important development. Hence, an intrinsic case study of domestic violence is presented to provide insights regarding the nature and impact of female-perpetrated violence. The research approach was qualitative and demonstrated that a model for abusive behavior seems to be similar for both sexes. The data revealed theoretical trends such as the reality of an intergenerational transmission of violence into adulthood, as well as abusive partners presenting with borderline traits.     

金融危机后日本银行货币政策框架演变与启示

为了应对全球性金融危机对金融系统的冲击,日本银行采用了极为宽松的货币政策,在灵活调整货币政策框架的同时运用了大量传统和非传统的政策工具。文章主要从货币政策目标、货币政策工具以及货币政策传导机制三个方面考察了金融危机后日本银行从传统货币政策体系框架向量化货币政策体系框架的演变过程。日本银行的政策实践对我国进一步完善货币政策框架有一定的借鉴和启示。     

西电东送的区域能源效应分析

西电东送有利于国家范围的资源优化配置,有利于开发西部。西电东送工程的成效,一方面取决于输入地内在的长期能源消费变动趋向,另一方面取决于其他能源,尤其是石油价格的未来变动走向,以及电力部门相应的定价策略。     

Like-Sex Versus Opposite-Sex Effects in Transmission of Gender Role Ideology from Parents to Adolescents in Israel

The study examined whether transmission of gender role ideology is more prevalent among parents and children of the same sex (like-sex effect) than among parents and children of the opposite sex (opposite-sex effect). Gender role ideology was assessed on the basis of 2 factors: gender role stereotypes and occupational sex-typing. The research sample consisted of 134 fathers, 134 mothers, and 134 Israeli adolescents (equally divided among girls and boys). Moderate correlations (ranging from 0.22 to 0.58) were found between parents and children, which indicate a partial like-sex effect. Specifically, father–son correlations in gender-role attitudes were higher than father–daughter correlations. Regarding occupational sex-typing, the same pattern was found only for attitudes toward masculine occupations. As far as mothers were concerned, no like-sex effect was found for either aspect of gender role ideology. Mothers were found to have the most liberal gender role attitudes, while children expressed less liberal attitudes, and fathers expressed the most traditional attitudes. As far as occupational sex-typing is concerned, mothers expressed the most liberal attitudes, while no significant differences were found between fathers and children. All family members expressed more traditional attitudes toward in-home roles than toward outside roles, and maintained more stereotyped perceptions of masculine tasks than those of feminine tasks.     

Sequencing of intersecting lines by combined lifting process and scanning electron microscopy

The chronological order in which two intersecting writing or typed strokes were made can be determined for several combinations of writing media by scanning electron microscope (SEM) examination, a lifting and transfer technique using Kromekote paper, or a combination of the transfer technique followed by SEM examination of the remaining material in the intersection. When non-destructive examination cannot provide unambiguous determination of sequence, judicious choice by the document examiner of which technique to use for a given combination of writing media and paper type can be made using known characteristics of the materials involved. The range of line-crossings which can be reliably sequenced is greater using a combined transfer and SEM technique than when the examination is limited to either technique alone.     

Intergenerational Transmission of Dating Aggression as a Function of Witnessing Only Same Sex Parents vs. Opposite Sex Parents vs. Both Parents as Perpetrators of Domestic Violence

The present study examined the association between witnessing interparental violence as a child, and the risk for perpetrating and being the victim of dating aggression as an adult, in an undergraduate sample. Specifically, this study tested a modeling hypothesis whereby witnessing a same sex parent vs. an opposite sex parent exclusively in the aggressor role would be more highly associated with risk for perpetrating dating aggression. Similarly, observing a same sex parent vs. an opposite sex parent as exclusively a victim of marital aggression would be associated with risk for being a victim of dating aggression. A same sex modeling effect was found for perpetration of dating aggression. Respondents who witnessed only their same sex parent perpetrate physical marital aggression were at increased risk for perpetrating physical dating aggression, whereas respondents who witnessed only their opposite sex parent perpetrate were not. A same sex modeling effect, however, was not found for being a victim of dating aggression. Rather, risk for victimization by dating aggression was associated only with witnessing bidirectional marital violence. Implications of these results, limitations of the present study, and ideas for future research are discussed.     

传播全球化对发展中国家的影响及其对策

国际广播、卫星电视、国际互联网络、跨国传播公司的扩张发展，使传播范围日益全球化，它对发展中国家在促进经济文化的繁荣发展、科技进步和政治民主化进程，缩小与发达国家差距等方面起到良好的促进作用，但同时在抢占媒介市场、冲击文化传统、干预社会意识形态以至内政外交等方面，也对发展中国家形成了挑战。制定和实行相关信息化政策，加强国际间的合作与交流，加快本国新闻传播媒体现代化、国际化步伐，是发展中国家迎接挑战的对策，而最根本的还是提高本国的经济实力。