A simple microscopy assay to teach the processes of phagocytosis and exocytosis

Phagocytosis and exocytosis are two cellular processes involving membrane dynamics. While it is easy to understand the purpose of these processes, it can be extremely difficult for students to comprehend the actual mechanisms. As membrane dynamics play a significant role in many cellular processes ranging from cell signaling to cell division to organelle renewal and maintenance, we felt that we needed to do a better job of teaching these types of processes. Thus, we developed a classroom-based protocol to simultaneously study phagocytosis and exocytosis in Tetrahymena pyriformis. In this paper, we present our results demonstrating that our undergraduate classroom experiment delivers results comparable with those acquired in a professional research laboratory. In addition, students performing the experiment do learn the mechanisms of phagocytosis and exocytosis. Finally, we demonstrate a mathematical exercise to help the students apply their data to the cell. Ultimately, this assay sets the stage for future inquiry-based experiments, in which the students develop their own experimental questions and delve deeper into the mechanisms of phagocytosis and exocytosis.     

For children only? Effects of the KiVa antibullying program on teachers

The effects of an antibullying program, KiVa, on Grade 1–3 teachers' perceptions of bullying were investigated. Data were gathered from 128 teachers in 33 intervention schools and 110 teachers in 29 control schools. Two-level regression models showed that, at the end of the intervention year, self-evaluated competence to tackle bullying was at a higher level in the intervention schools than in the control schools. In addition, in the intervention schools, participation in KiVa activities was associated with teacher perceptions of bullying. The need to take teacher and organization perspectives into consideration in future whole-school intervention studies is discussed.     

Graph-based term weighting for information retrieval

A standard approach to Information Retrieval (IR) is to model text as a bag of words. Alternatively, text can be modelled as a graph, whose vertices represent words, and whose edges represent relations between the words, defined on the basis of any meaningful statistical or linguistic relation. Given such a text graph, graph theoretic computations can be applied to measure various properties of the graph, and hence of the text. This work explores the usefulness of such graph-based text representations for IR. Specifically, we propose a principled graph-theoretic approach of (1) computing term weights and (2) integrating discourse aspects into retrieval. Given a text graph, whose vertices denote terms linked by co-occurrence and grammatical modification, we use graph ranking computations (e.g. PageRank Page et al. in The pagerank citation ranking: Bringing order to the Web. Technical report, Stanford Digital Library Technologies Project, 1998) to derive weights for each vertex, i.e. term weights, which we use to rank documents against queries. We reason that our graph-based term weights do not necessarily need to be normalised by document length (unlike existing term weights) because they are already scaled by their graph-ranking computation. This is a departure from existing IR ranking functions, and we experimentally show that it performs comparably to a tuned ranking baseline, such as BM25 (Robertson et al. in NIST Special Publication 500-236: TREC-4, 1995). In addition, we integrate into ranking graph properties, such as the average path length, or clustering coefficient, which represent different aspects of the topology of the graph, and by extension of the document represented as a graph. Integrating such properties into ranking allows us to consider issues such as discourse coherence, flow and density during retrieval. We experimentally show that this type of ranking performs comparably to BM25, and can even outperform it, across different TREC (Voorhees and Harman in TREC: Experiment and evaluation in information retrieval, MIT Press, 2005) datasets and evaluation measures.     

Assessment matters: Considering the scholarship of teaching and learning in student affairs

Tony Ribera, Sarah Fernandez, and Matt Gray apply a scholarly approach to assessing student learning in the cocurriculum.     

Differential growth patterns in emerging reading skills of Turkish-German bilingual and German monolingual primary school students

Students from Turkish-speaking families are the largest minority language group in Germany. Yet, little is known about this group’s literacy development. Using data from a 3-year longitudinal study, we examined whether the same base reading skills are involved in early reading comprehension of 100 Turkish-German bilingual and 69 German monolingual children. We applied a basic theoretical model of reading development to examine how emerging literacy develops for monolingual compared to bilingual children. Both the bilingual and monolingual children in this sample developed the investigated base reading skills at the same rate. However, the relations among phonological awareness, German vocabulary, and word decoding showed differential patterns in the development of German reading comprehension skills for the two groups: monolingual children appeared to make use of their phonological awareness skills more, whereas reading comprehension depended more on vocabulary skills for bilingual readers. Our findings indicate that bilingual emerging readers require specialized models of reading development to account for their unique routes into reading comprehension. The results of the study point to a need for increased attention to vocabulary building in the early phases of literacy acquisition for bilingual children.     

Where the private meets the public: Results of a survey of library professionals’ observed student use of academic library spaces for prayer

Abstract

Reports of college students using the library for spiritual practices, including prayer and meditation, consist mainly of anecdotal observations, news stories, or press releases about the creation of such spaces within academic libraries. Driven by their own experiences with students using library spaces for prayer, the authors examined how prevalent this was across US academic institutions. Using a large-scale national survey, this study found library professionals observe a wide range of student prayer behavior in a variety of library spaces, regardless of institutional or campus demographics. The results provide academic libraries with evidence to support accommodating students’ spiritual needs in library spaces.     

Television Teaching: Parody,The Simpsons,and Media Literacy Education

This paper examines televisual parody as a media literacy educator, and the potential of parody to channel the powers of comedy and entertainment in order to “teach” the techniques and rhetoric of televisual texts and genres. It focuses on the case of the hugely successful and popular animated parodic sitcom, The Simpsons, and its playful attack on advertising and promotional culture. Currently in its 16th season, The Simpsons broadcasts to approximately 60 million viewers in 70 countries weekly, offering a playful critique of television from within the television frame.     

Personal Malpractice Liability of Reference Librarians and Information Brokers

No abstract available for this article.