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1. Learning about Osmosis through Engineering Design Process

   https://doi.org/10.1525/abt.2022.84.5.297  

   Rice, Matthew; Mumba, Frackson; Pottmeyer, Laura (May 2022, The American Biology Teacher)

   Students’ sound knowledge about osmosis can lead to their understanding of other related biological processes that require the movement of materials across cell membranes, such as photosynthesis, homeostasis, and cellular respiration. However, students have difficulties to understand osmosis. This challenge has been attributed to the abstract nature of the concept and the way it is presented to students. Thus, we present an engineering design, integrated biology unit in which students use the engineering design process to learn about osmosis and its related concepts. A dependent t-test revealed statistically significant differences in students’ understanding of osmosis and related concepts, and the engineering design process before and after the unit. Overall, in this unit students developed the understanding of osmosis in a real-world context through an engineering design process. 

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2. Students’ Epistemic Connections Between Science Inquiry Practices and Disciplinary Ideas in a Computational Science Unit

   Dabholkar, Sugat; Irgens, Golnaz Arastoopour; Horn, Michael; Wilensky, Uri (June 2020, International Conference of the Learning Sciences)

   Teaching science inquiry practices, especially the more contemporary ones, such as computational thinking practices, requires designing newer learning environments and appropriate pedagogical scaffolds. Using such learning environments, when students construct knowledge about disciplinary ideas using inquiry practices, it is important that they make connections between the two. We call such connections epistemic connections, which are about constructing knowledge using science inquiry practices. In this paper, we discuss the design of a computational thinking integrated biology unit as an Emergent Systems Microworlds (ESM) based curriculum. Using Epistemic Network Analysis, we investigate how the design of unit support students’ learning through making epistemic connections. We also analyze the teacher’s pedagogical moves to scaffold making such connections. This work implies that to support students’ epistemic connections between science inquiry practices and disciplinary ideas, it is critical to design restructured learning environments like ESMs, aligned curricular activities and provide appropriate pedagogical scaffolds. 

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3. Characterizing Engineering Outreach Ambassadors' Teaching Moves during Engineering Design Activities (Fundamental)

   https://doi.org/10.18260/1-2--34275  

   Moison, Elizabeth; Miel, Karen; Portsmore, Merredith; Paul, Kelli; Maltese, Adam; Kim, Jungsun (January 2020, American Society of Engineering Education)

   Engineering outreach programs have the potential to significantly influence precollege youth; university-led engineering programs reach approximately 600,000 K-12 students each year in the United States. Despite the prevalence of these outreach programs, little is known about the nature of the discursive interactions between outreach ambassadors and participating youths and the ways in which these interactions support youths’ progress in engineering. Understanding the ways in which outreach ambassadors support youth to learn engineering is critical to furthering the effectiveness of these programs and contributes to greater understanding about how to support engineering in K-12 settings. Often, these programs are facilitated by undergraduate and graduate engineering ambassadors who themselves are developing as engineers and educators. In the context of an engineering outreach program for elementary students, this study examines the teaching moves of outreach ambassadors, adds to the understanding of their teaching moves, and offers preliminary conjectures about the impact of these moves on students. This study asks: What kinds of discursive teaching moves do outreach ambassadors enact when interacting with elementary student design teams?  In the focal outreach program, pairs of university students facilitated engineering design challenges in elementary classrooms for one hour each week throughout the school year. We selectively sampled and analyzed four such sessions in four fourth- and fifth-grade classrooms. We used discourse analysis and a lens of ambitious teaching to classify the teaching moves employed during interactions between ambassadors and small groups of students who were engaged in engineering design challenges. We identified a range of moves, including ambitious, inclusive, and conservative teaching moves, across the four sessions. From class to class, we observed variation in distribution of each category of teaching move and we hypothesize that activity design and outreach ambassador orientations toward teaching influence this variation.   Particularly promising for engineering teaching and learning, we observed ambassadors making bids to elicit student ideas, pressing for evidence-based explanations, and revoicing students’ design ideas. These moves are characteristic of ambitious instruction and have the potential to support students to engage in reflective decision-making and to guide students toward productive, more expert engineering design practices. Our analysis suggests that engineering outreach ambassadors notice and respond to students’ ideas, engaging in ambitious teaching practices which can be expected to support elementary students in making progress in engineering design. This analysis of outreach ambassadors’ discursive interactions with elementary student design teams adds to the growing conversation of ambitious instruction in engineering. 

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4. The Earlier the Better? Investigating the Importance of Timing on Effectiveness of Design for Additive Manufacturing Education

   Prabhu, Rohan; Miller, Scarlett R; Simpson, Timothy W; Meisel, Nicholas A (August 2018, Proceedings of the ... ASME Design Engineering Technical Conferences)

   Additive Manufacturing (AM) is a novel process that enables the manufacturing of complex geometries through layer-by-layer deposition of material. AM processes provide a stark contrast to traditional, subtractive manufacturing processes, which has resulted in the emergence of design for additive manufacturing (DfAM) to capitalize on AM’s capabilities. In order to support the increasing use of AM in engineering, it is important to shift from the traditional design for manufacturing and assembly mindset, towards integrating DfAM. To facilitate this, DfAM must be included in the engineering design curriculum in a manner that has the highest impact. While previous research has systematically organized DfAM concepts into process capability-based (opportunistic) and limitation-based (restrictive) considerations, limited research has been conducted on the impact of teaching DfAM on the student’s design process. This study investigates this interaction by comparing two DfAM educational interventions conducted at different points in the academic semester. The two versions are compared by evaluating the students’ perceived utility, change in self-efficacy, and the use of DfAM concepts in design. The results show that introducing DfAM early in the semester when students have little previous experience in AM resulted in the largest gains in students perceiving utility in learning about DfAM concepts and DfAM self-efficacy gains. Further, we see that this increase relates to greater application of opportunistic DfAM concepts in student design ideas in a DfAM challenge. However, no difference was seen in the application of restrictive DfAM concepts between the two interventions. These results can be used to guide the design and implementation of DfAM education. 

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5. Punnett Squares or Protein Production? The Expert–Novice Divide for Conceptions of Genes and Gene Expression

   https://doi.org/10.1187/cbe.21-01-0004  

   Newman, Dina L.; Coakley, Aeowynn; Link, Aidan; Mills, Korinne; Wright, L. Kate (December 2021, CBE—Life Sciences Education)

   Offerdahl, Erika (Ed.)

   Concepts of molecular biology and genetics are difficult for many biology undergraduate students to master yet are crucial for deep understanding of how life works. By asking students to draw their ideas, we attempted to uncover the mental models about genes and gene expression held by biology students ( n = 23) and experts ( n = 18) using semistructured interviews. A large divide was identified between novice and expert conceptions. While experts typically drew box-and-line representations and thought about genes as regions of DNA that were used to encode products, students typically drew whole chromosomes rather than focusing on gene structure and conflated gene expression with simple phenotypic outcomes. Experts universally described gene expression as a set of molecular processes involving transcription and translation, whereas students often associated gene expression with Punnett squares and phenotypic outcomes. Follow-up survey data containing a ranking question confirmed students’ alignment of their mental models with the images uncovered during interviews ( n = 156 undergraduate biology students) and indicated that Advanced students demonstrate a shift toward expert-like thinking. An analysis of 14 commonly used biology textbooks did not show any relationship between Punnett squares and discussions of gene expression, so it is doubtful students’ ideas originate directly from textbook reading assignments. Our findings add to the literature about mechanistic reasoning abilities of learners and provide new insights into how biology students think about genes and gene expression. 

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