DNA sequence representation by trianders and determinative degree of nucleotides

INTRODUCTION Genomic DNA sequence analysis using wide range of statistical methods (Torney et al., 1999; Bulmer, 1987; Luo et al., 1998; Nieselt-Struwe, 1997; Fickett et al., 1992; Buldyrev et al., 1998; Azbel, 1995) and various symmetry investigations (Findley et al., 1982; Hornos and Hornos, 1993; Bashford et al., 1997; Bhry et al., 1998; Forger and Sachse, 1998; Frappat et al., 1998) is an extremely important tool for extracting hidden information on the dynamic process of evolu…     

Using a conceptual framework and the opinions of portfolio experts to develop a teaching portfolio prototype

This article reports the design of a prototype for a teaching portfolio for development and assessment purposes. A portfolio prototype was developed according to theoretical choices based on portfolio literature and Zeichner and Wray's (2001) conceptual framework. We conducted an interview study in which portfolio experts were asked to judge to what extent our theoretical choices were reflected in the prototype developed and which modifications were needed. In general, the experts agreed that our choices were reflected in the prototype developed. However, there were some controversial topics, which are discussed, as well as key issues for further research.     

The effects of formative reading assessments closely linked to classroom texts on high school reading comprehension

Older student reading of informational texts like those found in most high school classrooms continue to be a concern. College entrance exams scores attest to the fact that this age group of readers remain largely unprepared for the rigorous, discipline area reading and comprehension demands of higher education. In response to this issue content area teachers have been encouraged to teach reading skills for their subject matter. Standard reading instruction tools have included reading guides and summative reading assessments. This study sought to compare the effects of standard reading pedagogy with computerized, formative reading assessments given to students as they read. The largest publisher of high school textbooks, Pearson Prentice-Hall, and the publisher of the high school government text used in this study currently does not have in place digital, formative reading assessments tracking section by chapter section. High school seniors in nine sections of American Government under two different instructors participated in this mixed method, quasiexperimental study. Results indicate a significant difference in content comprehension with the formative assessment pedagogy. Survey and questionnaire responses suggest students thought they read better and were more motivated to read responding to computerized formative assessments (CBA’s) that closely tracked their subject matter textbooks.     

The Interfacing of Preservice and Inservice Experiences of Reform-Based Teaching: A Longitudinal Study

This article contrasts four elementary teachers who were graduates of a teacher education program that incorporated a reform-based mathematics methods course. The report provides results from a four-year longitudinal study that extended from the time that the participants were preservice teachers until the end of their second year of teaching. The article provides background information of each teacher, vignettes from her teaching, excerpts from interviews, and an analysis of each teacher's case. Results from the case studies indicate that two of the four teachers sustained their cognitively-based conceptions about mathematics teaching and learning, and implemented these conceptions into practice. The analysis suggests that there were several factors that influenced the teachers' conceptions and the choices they made in their teaching: personal commitment, professional strength, curriculum, planning, assessment, beliefs, knowledge, and support from school administration. The article concludes with implications for teaching and questions about the nature of what might be required in the beginning years of teaching if new teachers are expected to implement reform-based mathematics teaching practices. This revised version was published online in August 2006 with corrections to the Cover Date.     

The Influence of Education and Family Background on Women's Earnings in Midlife: evidence from a British national birth cohort study

Studies which have investigated the influence of education on adult earnings are almost exclusively concerned with men and take little account of family influences on either education or later earnings. Those studies which have information on women's earnings focus on gender differentials rather than differences between women in opportunities and outcomes. This paper which examines the influence of education and family background on the midlife earnings of a national cohort of British women born immediately after the Second World War is an attempt to redress this situation. It shows that the few women who were able to take full advantage of the expansion in educational opportunities and achieve high educational qualifications earned significantly more in adult life than less educated females. Family background played an important role, both through its effect on early educational achievement and attitude to school work, which in turn influenced the type of secondary school attended and the achievement of educational qualifications, and also by well‐educated mothers raising their daughter's career expectations or providing successful role models. In adult life, employment characteristics which indicated a long‐term commitment to full‐time work and the decision not to have children, or to delay childbearing, were also important predictors of later economic success in this cohort, but did not explain the prior effects of education and family background. Advanced educational qualifications were the key to economic success for women bom in the early post‐war period.