抄録
The productmeter is a tool used to measure the volume change in gas while maintaining a fixed concentration of gas in a container, which in turn, compresses the sample. In this study, we used an improved and more complex productmeter than previously designed for research and education. We performed measurements of daytime photosynthesis in Ulva pertusa using the productmeter in order to examine its potential use as a teaching tool in university programs (higher education) and to study environmental maintenance, reproduction, and creation in coastal areas. By performing continuous measurements during algal cultivation using a productmeter, we aimed to obtain data on time, and discover applications suitable for biological experiments in teacher training courses using long-term continuous measurements, as well as for use in research experiments. We conducted measurements at 30 °C on the 1st day, 25 °C the 2nd day, 20 °C the 3rd day, and 15 °C on the 4th day, in order to determine the optimum water temperature. These measurements also revealed that the level of photosynthesis at different temperatures, with the greatest rates measured at 30 °C and the lowest at 15 °C.
