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.     

Transforming Biology Assessment with Machine Learning: Automated Scoring of Written Evolutionary Explanations

This study explored the use of machine learning to automatically evaluate the accuracy of students’ written explanations of evolutionary change. Performance of the Summarization Integrated Development Environment (SIDE) program was compared to human expert scoring using a corpus of 2,260 evolutionary explanations written by 565 undergraduate students in response to two different evolution instruments (the EGALT-F and EGALT-P) that contained prompts that differed in various surface features (such as species and traits). We tested human-SIDE scoring correspondence under a series of different training and testing conditions, using Kappa inter-rater agreement values of greater than 0.80 as a performance benchmark. In addition, we examined the effects of response length on scoring success; that is, whether SIDE scoring models functioned with comparable success on short and long responses. We found that SIDE performance was most effective when scoring models were built and tested at the individual item level and that performance degraded when suites of items or entire instruments were used to build and test scoring models. Overall, SIDE was found to be a powerful and cost-effective tool for assessing student knowledge and performance in a complex science domain.     

Large-scale academic achievement testing of deaf and hard-of-hearing students: past, present, and future

The first large-scale, nationwide academic achievement testing program using Stanford Achievement Test (Stanford) for deaf and hard-of-hearing children in the United States started in 1969. Over the past three decades, the Stanford has served as a benchmark in the field of deaf education for assessing student academic achievement. However, the validity and reliability of using the Stanford for this special student population still require extensive scrutiny. Recent shifts in educational policy environment, which require that schools enable all children to achieve proficiency through accountability testing, warrants a close examination of the adequacy and relevance of the current large-scale testing of deaf and hard-of-hearing students. This study has three objectives: (a) it will summarize the historical data over the last three decades to indicate trends in academic achievement for this special population, (b) it will analyze the current federal laws and regulations related to educational testing and special education, thereby identifying gaps between policy and practice in the field, especially identifying the limitations of current testing programs in assessing what deaf and hard-of-hearing students know, and (c) it will offer some insights and suggestions for future testing programs for deaf and hard-of-hearing students.     

film history

Kevin Brownlow The War, the West and the Wilderness (New York; Alfred A. Knopf, 1979 – $27.50, hardcover).

Marshall Deutelbaum, "Image" on the Art and Evolution of the Film (New York: Dover Publications, 1979 – $8.95 in paper).

American Theatres of Today, Volumes I and II, by R.W. Sexton and B.F. Betts (New Yorks Architectural Book Publishing Inc., 1927 and 1930 – reprinted at $35.00 in one volume, 360 pages, hardcover).

Picture Palace Architecture in Australia by Ross Thorne (South Melbourne: Sun Books, 1976 – $9.95 in paper from Vestal).

Temples of Illusion by Roger Brett($14.95, paper).

Carol Herselle Krinsky Rockefeller Center (New York: Oxford University Press, 1978 – $17.50 hardcover/ $9.95 paper)

Richard Taylor Film Propaganda: Soviet Russia and Nazi Germany (London: Croom Helm/ New York: Barnes & Nonle, 1979—$25.00)

William Kittredge and Steren M. Krauzer, eds. Stories into Film (New York: Harper & RowP2olophon Books, 1979—price not given, paper)

Richard Dyer Stars (London: British Film Institute, 1979—E2.25, or about $5.00, paper)     

Recruitment rhetoric in brochures advertising the all volunteer force

Solutions to Army personnel problems are of critical importance. Personnel issues continue to be problematic in a number of areas including: recruit intelligence level, careerist motivation of recruits, and the maintenance of trained, quality careerists in the all volunteer force (AVF). High attrition of skilled personnel is not related only to pay scale; pride in service, as well as intrinsic rewards may also relate to the retention and attraction of career‐motivated soldiers. This study analyzed the inducements offered and demands made of potential volunteers in brochures advertising the AVF. Most of the appeals in such brochures focused on instrumental rewards available to potential recruits, while few appeals featured traditional intrinsic satisfactions of military service as a motive for joining the AVF. The advertising strategy presently used in AVF brochures may explain in part why poor retention of skilled careerists continues to be one of its most severe problems. Recommendations for structuring future appeals are offered based on the findings.     

Purposeful Mentoring in Academic Libraries

ABSTRACT

This article offers statistical information about the future of our profession and the role that mentoring may play in retaining and promoting academic librarians into leadership positions within an organization. An overview of the history and definition of the word mentor and current terminology is offered to provide the reader with understanding of the complexity surrounding the concept of mentoring. Mentoring as process is explained, and both formal and informal mentoring processes are discussed and examples provided. The benefits of mentoring are detailed and include the benefits for mentors, mentees, and academic libraries, with a special focus on minorities and generational considerations now prevalent in libraries. Qualitative methodologies are examined to determine relationships, and the methods used include interviews, questionnaires, and print and online surveys. Case studies from across the nation are analyzed and offered as evidence that mentoring does in fact work well in many academic libraries, but librarians should be mindful that these mentoring processes must be evaluated periodically to remain viable. A brief discussion and future considerations section offer helpful information on gaps in the literature and the challenges that academic libraries face as they create and implement mentoring processes in their respective academic organizations.     

Visual stimulation using microcomputers

ABSTRACT

The dominant approach to the education of young visually handicapped children currently hinges on the idea of encouraging the use of sight through visual stimulation. This takes various forms, including the optimization of the child's visual environment, training children to use their sight efficiently, and photo‐stimulation to alter the early development of the brain. It is argued that microcomputers have an important part to play in providing visual stimulation. VDU monitors can present materials in a ‘back‐lit’ manner, avoiding the problem of occlusion of the light source. Moreover, input devices such as the touch‐sensitive screen allow children to interact directly with the images on the computer screen, ensuring that the visual stimulus received is related to their own actions.     

Analysing the integration of engineering in science lessons with the Engineering-Infused Lesson Rubric

ABSTRACT

Science teachers are being called on to incorporate engineering practices into their classrooms. This study explores whether the Engineering-Infused Lesson Rubric, a new rubric designed to target best practices in engineering education, could be used to evaluate the extent to which engineering is infused into online science lessons. Eighty lessons were selected at random from three online repositories, and coded with the rubric. Overall results documented the strengths of existing lessons, as well as many components that teachers might strengthen. In addition, a subset of characteristics was found to distinguish lessons with the highest level of engineering infusion. Findings are discussed in relation to the potential of the rubric to help teachers use research evidence-informed practice generally, and in relation to the new content demands of the U.S. Next Generation Science Standards, in particular.