Journal of Microbiology & Biology Education最新文献

Laboratory courses offer a unique opportunity, and sometimes challenge, to engage students in projects where they can experience ownership and authentic science practices. An important science practice is writing, which can lead to increased learning about concepts and science communication. Experiencing a sense of ownership in research can lead to various student outcomes, such as increased motivation, greater interest in research, and higher retention in STEM fields. Although previous work has extracted aspects of ownership from students' descriptions of research experiences, studies have not examined directly how students define and perceive ownership. In addition, we do not have a clear idea of whether a sense of ownership is related to student attitudes toward scientific writing in a lab course setting. To better understand the relationship between ownership and writing directly from students' perspectives, we used analysis of student responses to surveys and interviews in an upper-division laboratory course. Using a grounded theory approach for the analysis of 167 survey responses and 9 interviews, we found that students have varying perceptions of project ownership, with the most frequent being opportunities to contribute ideas and shape the project (autonomy), doing the work, and leadership. Students largely perceived that increased ownership had positive influences on their writing, such as increased understanding and thinking, freedom in writing, and increased motivation. Learning about how students perceive ownership in the context of a lab course is useful for considering how lab course structure may support the development of a sense of ownership and may influence how we can engage students in meaningful writing practices.

Psychological distance (PD) can be a barrier to how students perceive climate change impacts and severity. Localizing climate change using place-based approaches is one way instructors can structure their curricula to help combat students' PD, especially from a spatial and social viewpoint. We created a novel classroom intervention that incorporated elements of place-based education and the Teaching for Transformative Experiences in Science model that was designed to lower undergraduate biology students' spatial and social distance of climate change. Our research questions sought to determine whether students' PD changed following our intervention and whether variables beyond our intervention might have contributed to changes we identified. To measure the efficacy of our intervention, we administered a survey that contained several instruments to measure students' recognition and psychological distance of climate change pre- and post-intervention. We found that students' psychological distance to climate change decreased after participating in our classroom intervention. Additionally, course level was the only outside variable we identified as a predictor of students' post-activity scores. Participation in our activity lowered our students' spatial and social psychological distance, which could have impacts beyond the classroom as these students become the next generation of scientists and voters.

As one of the most famous fermented drinks in the world, beer is an especially relatable topic for microbiology courses. Here, we describe a short and easily adaptable module based on the antibacterial properties of hops used in brewing. By the 15th century, beer recipes included hops (the flower of the Humulus lupulus plant) as a bittering agent and antimicrobial. By the 19th century, the highly hopped Indian Pale Ale (IPA) became popular, and a modern myth has emerged that IPAs were invented to survive long ocean voyages such as from Britain to India. With that myth in mind, we designed a hypothesis-driven microbiology lab module that tests the plausibility of this brewing myth-namely that highly hopped beers possess enough antibacterial activity to prevent spoilage, while lowly hopped beers do not. The overall design of the module is to test the antimicrobial properties of hops using petri plates containing varying concentrations of hop extract. The module includes hypothesis generation and testing related to bacterial physiology and cell envelope morphology (hops are not equally effective against Gram-positive and Gram-negative bacteria) and to mechanisms of antimicrobial resistance (as beer spoilage bacteria have repeatedly evolved hop resistance). Pre- and post-assessment showed that students made significant gains in the learning objectives for the module, which encourages critical thinking and hypothesis testing by linking microbial physiology and antimicrobial resistance to an important and topical real-world application.

Calls to increase undergraduate involvement in research have led to a significant increase in student participation via course-based undergraduate research experiences (CUREs). These CUREs provide students an authentic research experience, which often involves dissemination of research by public speaking. For instance, the First-year Research Immersion (FRI) program at Binghamton University is a three-semester CURE sequence that prepares students for scientific research and effective communication of their findings. After one semester of research, students from the FRI program are tasked with presenting their research to hundreds of faculty members, staff, friends, and family at the annual FRI poster session. However, our students, and undergraduates in general, report high anxiety and fear around public speaking such as this. To better prepare our students for public speaking at a research poster session, we developed a workshop that includes a novel role-play activity to mimic a fast-paced poster session or conference in order to address students' fears and increase confidence levels. The role-play activity gives students iterative practice such that they are prepared for the realities of a poster session including variation of poster attendees. During the activity, students switch roles between presenter and audience member. In the role of an audience member, students are given Pokèmon-like role-playing cards that explain the traits and abilities of various types of poster-goers that students might come across (faculty in and out of discipline, staff, family, friends, etc.). Students improvise and enact their card-assigned role as they engage with their classmates who are practicing their poster presentations. To assess student outcomes, students were given three surveys: pre-activity, post-activity, and post-poster presentation. Immediately following the activity, 64% of students reported the highest level of confidence, and following the poster session, 93% of students reported extreme confidence in their poster presentation abilities. These data show that this role-play activity can help address student confidence and better prepare students to communicate their research.

Recombinant plasmids are essential tools in molecular biotechnology, and reliable plasmid assembly methods have, therefore, become a prerequisite for the successful cloning and transfer of genes. Among the multitude of available plasmid assembly strategies, in vivo homologous recombinational cloning in yeast has emerged as a cost-effective and relatively simple method. Since we use this method routinely in our group for assembling large plasmids with secondary metabolite gene clusters and for direct heterologous production of polyketides in Saccharomyces cerevisiae, we developed an exercise module for undergraduate students where they would get hands-on experience with these molecular practices. The exercises target several molecular techniques, including PCR, restriction enzyme digestion, and yeast recombinational cloning. The students will learn about plasmid assembly and yeast transformation methods by performing these experiments while inherently acquiring new skills valuable for their subsequent laboratory work or projects.

Logistical challenges in large enrollment classes are often mentioned as obstacles to active learning. Writing is an integral part of being a scientist and is often one of the first tools considered by STEM instructors to increase student engagement, but iterative writing assignments in large classes require creativity on the part of the instructor. We found an association between writing-to-learn assignments designed to be consistent with inclusive learning pedagogies and student performance measures in a large enrollment undergraduate biology course. They provide ample opportunity for deliberate practice and inclusive engagement, components of the "heads and hearts" hypothesis posed to explain the variation in active learning impacts on the performance of minoritized students.

Genetic analysis in model systems using bioinformatic approaches provides a rich context for a concrete and conceptual understanding of gene structure and function. With the intent to engage students in research and explore disease biology utilizing the nematode Caenorhabditis elegans model, we developed a semester-long course-based undergraduate research experience (CURE) in a hybrid (online/in-person) learning environment-the gene-editing and evolutionary nematode exploration CURE (GENE-CURE). Using a combination of bioinformatic and molecular genetic tools, students performed structure-function analysis of disease-associated variants of uncertain significance (VUS) in human orthologs. With the aid of a series of workshop-style research sessions, students worked in teams of two to six members to identify a conserved VUS locus across species and design and test a polymerase chain reaction-based assay for targeted editing of a gene in the nematode and downstream genotyping. Research session discussions, responsible conduct of research training, electronic laboratory notebook, project reports, quizzes, and group poster presentations at a research symposium were assessed for mastery of learning objectives and research progress. Self-reflections were collected from students to assess engagement, science identity, and science efficacy. Qualitative analysis of these reflections indicated several gains suggesting that all students found many aspects of the GENE-CURE rewarding (learning process of research, self-confidence in research and science identity, and personal interest) and challenging (iterative research and failure, time management, COVID-19 pandemic, and life issues).