Variations on variability: effects of display composition on same–different discrimination in pigeons

Discriminating same from different multiitem arrays can be represented as a discrimination between arrays involving low variability and arrays involving high variability. In the present investigation, we first trained pigeons with the extreme values along the variability continuum (arrays containing 16 identical items vs. 16 nonidentical items), and we later tested the birds with arrays involving intermediate levels of variability; we created these testing arrays either by manipulating the combination of same and different items (mixture testing) or by changing the number of items in the same and different arrays (number testing). According to an entropy account (Young & Wasserman, Journal of Experimental Psychology: Animal Behavior Processes 23:157?C170, 1997), the particular means of changing variability should have no effect on same?Cdifferent discrimination performance: Equivalent variability should yield equivalent performance. In this critical test of an entropy account, we found that entropy could explain a large portion of our data, but not the entire collection of results.     

Positive Effects of Converting a Food and Bioprocessing Analysis Course to an Inquiry‐Guided Approach

Abstract: Food science laboratory courses are traditionally taught as a series of preplanned laboratories with known endpoints. In contrast, inquiry‐guided (IG) laboratories allow students to ask questions, think through problems, design experiments, then adapt and learn in response to unexpected results. This study examined the effects of converting the course, “Analytical Techniques in Food and Bioprocessing Sciences” from a traditional approach (2008 to 2010 data) to an IG approach (2011 data) by assigning teams of 2–3 students a food and a set of 5 analyses to conduct over the course of the semester. Students were required to choose and justify the use of specific methods for each analysis, as well as to develop a supply list and a budget for the semester‐long project. During the semester, students were required to post and discuss their weekly progress with the instructor, teaching assistants, and the rest of the class using an online discussion forum. At the end of the semester, students were required to present the results of their analysis in both oral and written formats. Overall course grades were significantly higher (P≤ 0.05) using IG in 2011 compared to 2010 and 2009, but not to 2008 grades. Numerical course evaluations for the instructor, overall course, and lab, as well as written course evaluations all significantly (P≤ 0.05) improved. This suggests that an IG approach may measurably improve student performance in terms of course grades and the ability to complete semester long projects. It may also increase student satisfaction with the course, as measured by numerical and written end of semester surveys.     

A synergistic approach to turning the tide of grade inflation

Higher education in the United States is facing increasing demands for colleges and universities to demonstrate what students learn and that they are providing a high-quality education experience during the undergraduate years (Pascarealla et al. in Chang Mag High Learn 42(1):16–22, 2010). Despite evidence of the elevation of grades in higher education dating back to the 1970s, attempts to rein in this phenomenon have been largely unsuccessful (Nikolakakos et al. in Coll Univ 87(3):2–14 2012). It is our contention that attempts to reform grading have not succeeded because their focus is too narrow. After providing background information on the extent and causes of grade inflation, we will propose a synergistic approach to dealing with the problem of grade inflation.     

The Dialectical Relationship Between Place and Space in Education: How the Internet Is Changing Our Perceptions of Teaching and Learning

In this essay Michael Glassman and Jonathan Burbidge explore the idea of a dialectical relationship between the traditional place(s) of teaching/learning settings and the challenges to our perceptions created by the new spaces of the Internet. The authors examine this topic in the context of a three‐stage evolution of humans' relationship with new technologies: (1) fear of how new technologies will change our everyday actions, (2) recognition of emerging technologies as tools capable of offering new possibilities in our activities, and (3) integration of new technologies into productive everyday activities. The Internet is moving quickly through all three stages, but this process takes different forms with disparate populations. What makes recognition of the fast‐moving integration of Internet technology important in the field of education is that students and educators are often at different points in this process. It is critical that we are aware of the role technology is playing in the classroom, in particular the dynamic dialectical relationship between space and place.     

PERSONNEL NEEDS IN SCHOOL PSYCHOLOGY: A 10‐YEAR FOLLOW‐UP STUDY ON PREDICTED PERSONNEL SHORTAGES

Concerns regarding whether a sufficient supply of school psychologists exists have been evident for decades. Studies have predicted that school psychology would face a critical personnel shortage that would peak in 2010, but continue into the foreseeable future. The current study is a 10‐year follow‐up investigation based on previously published personnel shortage projections. Data derived from the National Association of School Psychologists 2009–2010 national study were used to examine current personnel shortages as well as to project the extent to which personnel shortages are likely to continue. Findings indicate that the field of school psychology continues to experience a personnel shortage that will continue through 2025. Additionally, greater rates of retirements are projected for the field for school psychologists who are males, who possess a doctoral degree, and for university faculty. Analyses based on the U.S. Census Regions indicate that notable differences are likely to occur in the match between the supply of and demand for school psychologists based on geographical location. Implications are discussed relating to the recruitment and retention of school psychologists and to the services they deliver.     

Afterword. Anarchism,texts and children: active conversations with the past

In appreciating and responding to the three symposium papers on “Anarchism, Texts and Children”, a case is made for what John Berger has called “the honour of an alternative”, for affirmation as well as for refusal. Not only should we respond positively and imaginatively to Colin Ward’s call for “counter-history” of our own making, we should also extend our advocacy of alternatives through the adventure of more creative historical methodologies. Lastly, in the spirit of Berger’s writing, this Afterword celebrates the capacity of all three papers not just to speak to issues of enduring human importance, but to do so imaginatively and eloquently, thereby refusing and subverting the increasingly dreary hegemony of academic writing disgracefully in thrall to the diminishing calculus of neo-liberalism.     

THE EFFECTS OF MIDDLE SCHOOL BULLYING AND VICTIMIZATION ON ADJUSTMENT THROUGH HIGH SCHOOL: GROWTH MODELING OF ACHIEVEMENT,SCHOOL ATTENDANCE,AND DISCIPLINARY TRAJECTORIES

The current 5‐year longitudinal study examined the effects of middle school bullying and victimization on adolescent academic achievement, disciplinary referrals, and school attendance through high school (N = 2030; 1016 both boys and girls). Greater engagement in bullying behaviors was concurrently associated with lower achievement and school attendance for girls and higher levels of disciplinary problems, and, for girls, predicted increases in disciplinary referrals through high school. Victimization was unrelated to school adjustment difficulties when controlling for bullying. Moreover, academic achievement was longitudinally associated with disciplinary referrals and school attendance. These findings outline concurrent school adjustment difficulties associated with engagement in bullying behavior, the longer‐term behavioral ramifications for girls, and the relations of behavioral and academic development from middle school to high school.     

防污损涂料添加剂Irgarol-1051降解产物对H4IIE鼠肝癌细胞的基因影响(英文)

为研究海洋防污损涂料添加剂Irogarol-1051的降解产物M2的基因毒性,应用微阵列技术,选取Affymetrix公司鼠基因组230 2.0基因芯片检测30μmol/L M2暴露下的鼠肝癌细胞基因表达变化.实验结果显示,96 h的M2暴露导致了38个基因在全部4组可能的对照/暴露中均发生显著变化(p0.002 5),其中只有Accn5基因研究较为透彻,该基因表达的抑制可能影响上皮钠通道的功能.此外,分别有10和82个功能注释基因在至少一组对照/暴露组中上调和下调.M2诱导的基因主要和细胞核(细胞成分)相关.M2抑制的基因则主要影响生物过程中的G蛋白偶联信号通路功能和细胞成分中的细胞膜内整合功能.