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In 2020, due to coronavirus, most educational institutions have been conducting remote, that is, non-face-to-face classes. Unlike face-to-face classes, non-face-to-face classes are a specific educational approach in which lectures are conducted online using software and electronic devices. Students' academic performance and online lesson satisfaction is extremely important for them. Accordingly, it is important to investigate students' academic performance and online lesson satisfaction. This research conducted an empirical study targeting Chinese university students. The focus was on their online lecture fit as a means of improving academic performance and satisfaction with online lectures. This research addressed the two key points to improve academic performance and online lecture satisfaction. We investigated whether online lecture fit enhanced academic performance through the mediating role of online lecture satisfaction. We also investigated whether online lecture fit enhanced online lecture satisfaction through the mediating effect of academic performance. According to this, the main purpose is to provide a clearer mediating process through these two points. The results of this study not only emphasize the importance of online lecture fit, but also identify the role of enhancing academic performance and online lecture satisfaction. Finally, practical implications are presented through the results of empirical analysis and future research directions are also discussed.

In 2020, due to coronavirus, most educational institutions have been conducting remote, that is, non-face-to-face classes. Unlike face-to-face classes, non-face-to-face classes are a specific educational approach in which lectures are conducted online using software and electronic devices. Students' academic performance and online lesson satisfaction is extremely important for them. Accordingly, it is important to investigate students' academic performance and online lesson satisfaction. This research conducted an empirical study targeting Chinese university students. The focus was on their online lecture fit as a means of improving academic performance and satisfaction with online lectures. This research addressed the two key points to improve academic performance and online lecture satisfaction. We investigated whether online lecture fit enhanced academic performance through the mediating role of online lecture satisfaction. We also investigated whether online lecture fit enhanced online lecture satisfaction through the mediating effect of academic performance. According to this, the main purpose is to provide a clearer mediating process through these two points. The results of this study not only emphasize the importance of online lecture fit, but also identify the role of enhancing academic performance and online lecture satisfaction. Finally, practical implications are presented through the results of empirical analysis and future research directions are also discussed.

This study assessed the impact of four different concentrations (2.5, 5, 7.5, 10 μg/L) of mercury exposure on Manila clam Venerupis philippinarum based on the dynamic characteristics of antioxidant related enzymes including superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), acid phosphatase (ACP), alkaline phosphatase (ALP), total glutathione content, and malondialdehyde (MDA) content at 24 h and 48 h post exposure. The results showed that hemocyte SOD activity was inhibited while GR hemocyte activity significantly increased in the 2.5 μg/L group after 24 h. Hemocyte ALP activity and (GSH) content were also elevated at the 7.5 μg/L and 10 μg/L groups when exposed for 24 h, respectively. SOD activity, GR activity, ALP activity and GSH content in the hemocytes were relatively sensitive to different concentrations of mercuric mercury (Hg2+), suggesting that they may act as potential biomarkers in assessing environmental mercury exposure on Venerupis philippinarum. At different levels of exposure, antioxidant parameters showed differing responses in gill tissue, but no biomarkers were discovered in the samples examined. We found that hemocytes are more suitable biomarkers than proteins in gill tissue. Some hemocyte biomarkers are promising candidates for monitoring mercury pollution in marine clams.