Objective:To observe the application of case-based problem-based learning (PBL) teaching in the postgraduate education of radiography.Methods:A total of 48 postgraduates in the Batch 2019/2020 of professional masters majoring in radiography were selected as research objects, and they were divided into observation group ( n=24, Batch 2020) and control group ( n=24, Batch 2019). The students in the control group were taught by traditional teaching, and the students in the observation group were taught by case-based PBL teaching method. The differences in imaging diagnosis level and structured assessment scores of the two groups of students and their evaluation of the teaching process were analyzed. SPSS 20.0 was applied to perform the t test and chi-square test. Results:The imaging diagnosis ability of the students in the observation group (84.98±7.51) was significantly higher than that in the control group (78.21±6.96) , and the difference was statistically significant ( P<0.05). The students in the observation group had higher ability of imaging diagnosis skills and case analysis and diagnosis during the structured assessment ( P<0.05). The students in the observation group had higher overall satisfaction with the teaching process than those in the control group ( P<0.05). Conclusion:The case-based PBL teaching is of great help in improving the clinical thinking and imaging diagnosis ability of postgraduates majoring in radiography. In the application, it is necessary to continuously improve and supplement the teaching implementation plan according to the teaching evaluation and feedback.

Human activities increase the concentration of atmospheric carbon dioxide (CO₂), which leads to global climate warming. Microbial CO₂ fixation is a promising green approach for carbon neutral. In contrast to autotrophic microorganisms, heterotrophic microorganisms are characterized by fast growth and ease of genetic modification, but the efficiency of CO₂ fixation is still limited. In the past decade, synthetic biology-based enhancement of heterotrophic CO₂ fixation has drawn wide attention, including the optimization of energy supply, modification of carboxylation pathway, and heterotrophic microorganisms-based indirect CO₂ fixation. This review focuses on the research progress in CO₂ fixation by heterotrophic microorganisms, which is expected to serve as a reference for peaking CO₂ emission and achieving carbon neutral by microbial CO₂ fixation.
Carbon Cycle ; Carbon Dioxide/metabolism* ; Heterotrophic Processes ; Humans ; Synthetic Biology