Mathematics and Mobile Learning

This paper argues for an approach to mobile learning that leverages students’ informal digital practices as resources for designing mathematics classrooms activities. We briefly describe two exploratory designs along these lines, one featuring the use of photos taken by students outside class and the other centered on their recording and analyzing videos of motion. We then present a case study analysis of two students working through portions of these activities in class and discuss the potential of the approach as well as challenges associated with its implementation.     

Putting PhDs to Work: Career Planning for Today's Scientist

Individual development plans (IDPs) have been promoted nationally as a tool to help research trainees explore career opportunities and set career goals. Despite the interest in IDPs from a policy perspective, there is little information about how they have been used. The authors examined IDP awareness and use, the benefits of creating an IDP, and ways to facilitate its use by administering a survey to current or former postdoctoral researchers via the National Postdoctoral Association (NPA) and University of Alabama at Birmingham email lists; individuals belonging to Federation of American Societies for Experimental Biology member societies who mentored postdocs; and postdoctoral administrators at member institutions of the Association of American Medical Colleges and the NPA. Although most postdoctoral administrators (>80%) were familiar with IDPs, less than 50% of postdocs and only 20% of mentors were aware of IDPs. For those postdocs and mentors who reported creating an IDP, the process helped postdocs to identify the skills and abilities necessary for career success and facilitated communication between postdocs and their mentors. Despite the fact that creating an IDP benefits postdocs and mentors, IDP use will likely remain low unless institutions and research mentors encourage trainees to engage in this process.     

Introduction of Molecular Methods into a Food Microbiology Curriculum

Maintaining current, relevant curriculum in undergraduate Food Microbiology courses is essential for training future experts in food quality and safety. Having an understanding of the fundamental techniques (for example, polymerase chain reaction [PCR]) that are used in the food industry and regulatory agencies is critical for students entering the workforce. The purpose of this study was to assess the efficacy of integrating molecular methods into an undergraduate Food Microbiology course in both lecture and laboratory settings. Modules on PCR and pulsed‐field gel electrophoresis (PFGE), both of which are currently used by government agencies and the food industry to investigate the presence and persistence of foodborne pathogens, were developed, introduced, and evaluated among 269 students over 4 y. Multiple teaching and learning styles were incorporated through (i) traditional lecture format on the basics of PCR and PFGE; (ii) hands‐on group activities to build upon the lecture instruction; (iii) performing PCR and PFGE in the laboratory; and (iv) group discussions to analyze results from laboratory exercises. Pre‐ and postinstruction evaluations revealed significant increases in understanding and application of both methods in lecture and laboratory settings as demonstrated by 0.60 and 0.51 mean normalized gains for respective PCR and PFGE lectures and 0.50 and 0.56 mean normalized gains in respective labs. Academic year significantly impacted score improvement, potentially due to hidden factors, such as previous exposure to material and student aptitude. This study provides the platform for successful introduction of molecular techniques in an undergraduate Food Microbiology course. The guidelines and materials developed by our group are publicly available for use by other institutions.     

What Are They Thinking? Findings for Educators and Practitioners on Youths’ Experience and Knowledge of the HPV Vaccine

The Centers for Disease Control and Prevention (CDC) recommends the HPV vaccination for boys and girls starting at age 11, yet adoption rates are low. We use eight focus groups to explore the decision making process, experiences, and social influences, including media and sex education classes, shaping attitudes of male and female college students. We find many students who have misinformation or no knowledge of the vaccination yet are eager to learn more. Due to youths’ range of knowledge about the vaccination and varied preparedness for making their own medical decisions, practitioners are in a challenging position to inform and encourage responsible decision making without appearing coercive.     

‘Technological me’: young children’s use of technology across their home and school contexts

Research into children’s learning with digital technologies is represented by a growing body of literature examining the relationship between home–school technological practices. A focus of this work is on the notion of a ‘digital-disconnect’ between home and school. This argument suggests that children are such native users of technologies they struggle to connect with commonly used technologies in school. This paper examines how the ‘digital-disconnect’ is experienced in children’s lives. Drawing on a data set investigating the digital experiences of 12 children aged 2–12 years, we consider the experiences of one family attending the same school. Three siblings aged 5–12 years recorded their home and school technology use for one week. The findings suggested some difference in use across both settings, but also similarities associated with information retrieval, rote learning and entertainment. We use Bulfin and North’s and Dyson’s ideas about the permeability of social boundaries to explain why technology use might be more similar than disconnected in each context. We consider the extent to which each setting influences the other as the basis for moving away from binary conceptualisations of the digital-disconnect informed by generational assumptions about children and technologies.     

Back to the 1990s? Comparing the Discourses of 20th- and 21st-Century Digital Image Ethics Debates

In 2010, New York Times photographer Damon Winter sparked controversy when he used an iPhone equipped with the Hipstamatic application to produce heavily filtered, Polaroid-style front-page photographs of U.S. troops in Afghanistan. The debate over whether such images were photojournalism, or merely photographs, was reignited the next year as some of his images were honored in one of the country's most prestigious photojournalism competitions, and the practice of using filter-friendly apps for journalism spread. This article compares professional discourses around such journalistic use of smartphone apps with discourses that developed earlier in the digital era around digital image manipulation in Photoshop, with the goal of proposing ways to interrogate imaging technology controversies yet to come.     

High-throughput particle separation and concentration using spiral inertial filtration

A spiral inertial filtration (SIFT) device that is capable of high-throughput (1 ml/min), high-purity particle separation while concentrating recovered target particles by more than an order of magnitude is reported. This device is able to remove large fractions of sample fluid from a microchannel without disruption of concentrated particle streams by taking advantage of particle focusing in inertial spiral microfluidics, which is achieved by balancing inertial lift forces and Dean drag forces. To enable the calculation of channel geometries in the SIFT microsystem for specific concentration factors, an equivalent circuit model was developed and experimentally validated. Large particle concentration factors were then achieved by maintaining either the average fluid velocity or the Dean number throughout the entire length of the channel during the incremental removal of sample fluid. The SIFT device was able to separate MCF7 cells spiked into whole blood from the non-target white blood cells (WBC) with a recovery of nearly 100% while removing 93% of the sample volume, which resulted in a concentration enhancement of the MCF7 cancer cells by a factor of 14.     

Fabrication of rigid microstructures with thiol-ene-based soft lithography for continuous-flow cell lysis

In this work, we introduce a method for the soft-lithography-based fabrication of rigid microstructures and a new, simple bonding technique for use as a continuous-flow cell lysis device. While on-chip cell lysis techniques have been reported previously, these techniques generally require a long on-chip residence time, and thus cannot be performed in a rapid, continuous-flow manner. Microstructured microfluidic devices can perform mechanical lysis of cells, enabling continuous-flow lysis; however, rigid silicon-based devices require complex and expensive fabrication of each device, while polydimethylsiloxane (PMDS), the most common material used for soft lithography fabrication, is not rigid and expands under the pressures required, resulting in poor lysis performance. Here, we demonstrate the fabrication of microfluidic microstructures from off-stoichiometry thiol-ene (OSTE) polymer using soft-lithography replica molding combined with a post-assembly cure for easy bonding. With finite element simulations, we show that the rigid microstructures generate an energy dissipation rate of nearly 10⁷, which is sufficient for continuous-flow cell lysis. Correspondingly, with the OSTE device we achieve lysis of highly deformable MDA-MB-231 breast cancer cells at a rate of 85%, while a comparable PDMS device leads to a lysis rate of only 40%.     

Learning the Ropes of Program Evaluation: A Case Study

This case study describes a program evaluation framework that works well for both simple and complex projects. The subject was a retreat designed to integrate graduate students into a five‐year research project. Key elements of the evaluation comprised working with stakeholders and developing a logic model to identify what dimensions to evaluate, gathering and identifying data needed to answer the evaluation questions, constructing rubrics to evaluate the data, and then synthesizing and integrating the data to provide recommendations.