RESUMEN
Many medical students use spaced repetition as a study strategy to improve knowledge retention, and there has been growing interest from medical students in using flashcard software, such as Anki, to implement spaced repetition. Previous studies have provided insights into the relationship between medical students' use of spaced repetition and exam performance, but most of these studies have relied on self-reports. Novel insights about how medical students use spaced repetition can be gleaned from research that takes advantage of the ability of digital interfaces to log detailed data about how students use software. This study is unique in its use of data extracted from students' digital Anki data files, and those data are used to compare study patterns over the first year of medical school. Implementation of spaced repetition was compared between two groups of students who were retrospectively grouped based on average performance on three exams throughout the first year of medical school. Results indicate that students in the higher scoring group studied more total flashcards and implemented spaced repetition via Anki earlier in the year compared to the lower scoring group. These findings raise the possibility that implementing spaced repetition as a study strategy early in medical school may be related to improved knowledge retention and exam performance. Additional research should be performed at more sites to further examine the relationship between spaced repetition implementation and exam performance.
RESUMEN
Electronic waste can lead to the accumulation of environmentally and biologically toxic materials and is a growing global concern. Developments in transient electronics-in which devices are designed to disintegrate after use-have focused on increasing the biocompatibility, whereas efforts to develop methods to recapture and reuse materials have focused on conducting materials, while neglecting other electronic materials. Here, we report all-carbon thin-film transistors made using crystalline nanocellulose as a dielectric, carbon nanotubes as a semiconductor, graphene as a conductor and paper as a substrate. A crystalline nanocellulose ink is developed that is compatible with nanotube and graphene inks and can be written onto a paper substrate using room-temperature aerosol jet printing. The addition of mobile sodium ions to the dielectric improves the thin-film transistor on-current (87 µA mm-1) and subthreshold swing (132 mV dec-1), and leads to a faster voltage sweep rate (by around 20 times) than without ions. The devices also exhibit stable performance over six months in ambient conditions and can be controllably decomposed, with the graphene and carbon nanotube inks recaptured for recycling (>95% recapture efficiency) and reprinting of new transistors. We demonstrate the utility of the thin-film transistors by creating a fully printed, paper-based biosensor for lactate sensing.