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For the next try I decided to use the aquarium installation instead of a tube. I made good experiences in | For the next try I decided to use the aquarium installation instead of a tube. I made good experiences in Experiment 3 (please look below for more information) because the Euglena reacted very sensitive to the light source and did not settle on the ground. | ||
After using the aquarium for experiment 3 and finishing it I pulled a new mask over the glass. It consists of a black nontransparent back and three transparent foils at the front. I put the installation in front of the daylight lamp again and waited for two hours. | After using the aquarium for experiment 3 and finishing it I pulled a new mask over the glass. It consists of a black nontransparent back and three transparent foils at the front. I put the installation in front of the daylight lamp again and waited for two hours. | ||
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''Third Attempt'' | ''Third Attempt'' | ||
This time I | I repeated the experiment with different colors and and a new medium. This time I used the Euglena from the beaker glass. With altogether five colors I wanted to create more contrasts. | ||
After one and a half hour of illumination I reached a more satisfying result then before. On the bottom there were three separeted stripes clearly visible. As I knew Euglena is not able to see red light and maybe also orange because it is a mixture of yellow and red. All the other colors - yellow, green and blue - seem to be transparent and light enough to be a good concentration point. Between those stripes were thin parts where the colors overlapped and made a darker shade. Those areas are clear and not (or only less) besieged by the organisms. | |||