植物自花授粉的类型及其适应性进化     

杨期和  杨和生  李姣清 《嘉应学院学报》2011,29(8):55-64

综述了植物自花授粉的方式和类型,分析了自花授粉的生态适应性、可能的进化趋势及其影响因素.自花授粉是指两性花中雌雄蕊之间的授粉,通常也包括同株异花间的授粉.植物按授粉方式可分为自花授粉植物、异花授粉植物和常异花授粉植物3类.在自然界很少有绝对自花授粉的植物,都存在一定频率的异交,根据其自交发生的时间,可将自交分为3种方式:优先自交、竞争自交和滞后自交.自交进化的假说主要集中在两个方面,即繁殖保障和自动选择优势,并已得到广泛的数据支持.分子生物学和生态学相结合的研究方法将进一步揭示植物自花授粉的形成与进化机制.  相似文献   

Dress rehearsal: a Bourdieusian analysis of body work in career portfolio programs     

Ross Collin 《British Journal of Sociology of Education》2011,32(5):785-804

This article examines how career portfolio programs at two secondary schools establish corporeal regimes. Both programs require students to compose portfolios that plot their trajectories through school and into paid work. Prior to graduation, students defend their portfolios before panels of educators and businesspeople. Employing the Bourdieusian concepts of capital and habitus, this article investigates how these programs set up systems that value certain kinds of bodies. Further, it examines how students negotiate these systems and display different kinds of bodies in different kinds of ways. Ultimately, it is argued these disparate bodily performances are read by authorities as indicators of the types of paths students are travelling or should travel into the future.  相似文献   

Colleges in the making of manhood and masculinity: gendered perspectives on African American males     

T. Elon Dancy II 《Gender and education》2011,23(4):477-495

Using an interdisciplinary approach, this paper explores the ways in which colleges become sites that socialise African American men as gendered beings. Twenty-four African American men enrolled in 12 colleges and universities across the 19 southern and border states of America participated in this study. The purpose is to illustrate how constructions of manhood and masculinity among this group potentially influence collegiate efforts to serve African American college men academically, socially, and developmentally. The following themes of manhood construction emerged: (1) self-expectations; (2) relationships and responsibilities to family; and (3) worldviews and life philosophies. Respondents reported differences in the ways in which they were treated and engaged in historically black and white institutions, also reinforcing various manhood constructs. The paper is a resource to advance the field’s thinking about this group’s college experiences, retention, and identities.  相似文献   

Intersectional agencies: Navigating predominantly White institutions as an administrator of color     

Robert J. Razzante 《Journal of International and Intercultural Communication》2018,11(4):339-357

Administrators of color in predominantly White institutions (PWI) navigate from dual positions of privilege and marginalization. Within PWIs, administrators of color experience marginalization in terms of their racial/ethnic makeup. Specifically focusing on the administrative level, 95.8% of executive provosts and 86.2% of deans of academic colleges are White. At the faculty level, nearly 10% of full professors are people of color. However, even with such exclusionary practices, 87.7% of chief diversity officers are racial minorities. The current study seeks to understand how highly educated administrators of color work for diversity, inclusion, and equity initiatives while navigating from their dual positions of marginalization and privilege. Using the theoretical lenses of co-cultural theory, dominant group theory, and intersectionality, the study seeks to understand how privilege and marginalization ebbs and flows depending on particular contexts. Findings indicate that optimizing privilege through co-cultural praxis and impeding through mentoring are two common strategies used by administrators of color.  相似文献   

Martin to Brown     

Danielle K. Kilgo  Rachel R. Mourao  George Sylvie 《Journalism Practice》2019,13(4):413-430

The rise of the modern Black Lives Matter movement can be traced back to two key events, the 2012 death of Trayvon Martin and the 2014 death of Michael Brown. Research routinely showed that mainstream media’s narrative choices marginalize and delegitimize protesters and their causes, a pattern known as the protest paradigm. This study provides a longitudinal examination of how the same mainstream media system varied in their coverage of similar events and the degree to which journalists challenged the predicted paradigms conceptualized in other academic work. A content analysis of national newspaper coverage revealed that news before the judicial rulings focused on protesters’ tactics (violence versus peaceful) and changed to the realm of ideas (grievances and demands) after the assailants were considered not guilty of wrongdoing. No progression was found in legitimizing coverage of protests between the two cases.  相似文献   

“I never thought this could be for me”: aspirational capital,identities, and political engagement among first-generation college students in São Paulo     

Charles H. Klein  Milena Mateuzi Carmo 《International Studies in Sociology of Education》2019,28(3-4):259-278

ABSTRACT

Today, young adults from lower-income backgrounds are pursuing educational trajectories that would have been distant dreams for their parents. In many Global South countries, this expansion has followed a neoliberal logic in which private universities purport to provide students skills and increased earning capacity, and employers the necessary human capital to compete in global markets. This article examines these processes in Brazil, where federal policies have contributed to a dramatic growth in private, for-profit higher education in recent years. Building on ethnographic research in São Paulo’s expansive peripheries, our analysis examines three inter-related themes: higher education and life aspirations; intersectional identity construction; and political/community engagements. We argue that while neoliberal ideologies and policies are a key component of Brazilian higher education, many first-generation college students actively – and critically – challenge everyday oppressions and create new life possibilities in the context of enduring inequalities.  相似文献   

On the elephant in the room: toward a generative politics of place on race in academic discourse     

Baudelaire Ulysse  Theodorea Regina Berry 《International journal of qualitative studies in education》2016,29(8):989-1001

Abstract

In our conceptual essay, we draw on an exchange between a White scholar and a group of panelists on Critical Race Theory at an international conference. Taking up this exchange as our point of departure, we work in dialectical and multidimensional ways between the essentialized politics of place on race and critical anti-essentializing foundations in recent Critical Race Feminism and Critical White Studies’ literatures. Working the dialectics and multidimensionality of the place that race makes in academic discourse, we recognize and ethically work through the essentialized politics of place in advancing anti-essentializing understandings of race. In articulating these anti-essentializing understandings, our conceptual essay drives at the notion of a generative politics of place on race in academic discourse. A generative politics of place holds essentialized realities and anti-essentializing foundations of race in dialectical and multidimensional tension for teaching, learning, and discussing race in local, national, and international contexts.  相似文献   

美国作家罗斯《人性的污点》“身份情节”评析     

宋继红 《辽宁师范大学学报(社会科学版)》2015,(2):239-243

菲利普·罗斯是美国著名犹太小说作家,《人性的污点》是其美国三部曲的最后一部。罗斯在这部小说中遵循并超越了他称之为"身份情节"的体裁。这部小说通过各种方式将种族身份解释为种类、符号或生物学特征,最终揭示了主人公科尔曼种族身份的最具有决定性作用的特征就是他的隐秘性。对于罗斯来说,秘密不仅是身份的来源,也是欲望和叙述的驱动力。《人性的污点》不仅仅通过种族身份的掩藏与揭露探究了种族问题,也揭示了人性的很多污点,譬如婚外恋、乱伦等。但小说所有的辅助线索都是为了服务、突出种族问题这个大前提,背景的叙述也是为了给科尔曼和弗妮娅的恋情铺平道路。  相似文献   

Advanced Math Course Taking: Effects on Math Achievement and College Enrollment     

Soo-yong Byun  Matthew J. Irvin  Bethany A. Bell 《Journal of Experimental Education》2015,83(4):439-468

Using data from the Educational Longitudinal Study of 2002–2006, the authors investigated the effects of advanced math course taking on math achievement and college enrollment and how such effects varied by socioeconomic status and race/ethnicity. Results from propensity score matching and sensitivity analyses showed that advanced math course taking had positive effects on math achievement and college enrollment. Results also demonstrated that the effect of advanced math course taking on math achievement was greater for low socioeconomic status students than for high socioeconomic status students, but smaller for Black students than for White students. No interaction effects were found for college enrollment. Limitations, policy implications, and future research directions are discussed.  相似文献   

How stable is the stratification of higher education in England and Scotland?     

David Raffe  Linda Croxford 《British Journal of Sociology of Education》2015,36(2):313-335

This paper asks whether the institutional hierarchies defined by ‘golden triangle’, other Russell Group, other pre-1992 and post-1992 universities in England, and by ancient, old and new universities in Scotland, have become weaker since the 1990s. Using indicators constructed from Universities and Colleges Admissions Service data for 1996–2010, the article finds a stable hierarchical relationship among the sectors within each country, with some indicators showing a slight widening of status differences between sectors towards the end of the period. The main exception was a slight ‘upgrading’ of new (post-1992) universities in Scotland early in the period. There was little change in the association of institutional sector with social class, but in England the association with private secondary schools became slightly stronger and the association with ethnicity weakened.  相似文献