2026-03-12T13:37:21Z https://kanagawa-u.repo.nii.ac.jp/oai

oai:kanagawa-u.repo.nii.ac.jp:00013568 2023-06-19T02:08:59Z 376:377:378:1311

Microplastic Beads Incorporated into a Single Cell ： Analyses Using the Green Paramecium, Paramecium bursaria Hosoya, Hiroshi Suzuki, Kyosuke Fujita, Misato Hosoya, Natsumi Kotani, Susumu Hino, Akiya protist micro plastic bead cell division benthic ciliate The unicellular protist Paramecium bursaria harbors hundreds of symbiotic algae resembling Chlorella species in the cell. It is thought that the host P. bursaria uses some of photosynthetic products from these algae when sunlight is available. When photosynthesis cannot be performed, P. bursaria preys on bacteria, molds, algae, etc. in the surroundings for an energy source. Interestingly, some of the algae were observed to move from the food vacuole to the cytoplasm, becoming symbionts, within several days after incorporation into the cell. Since P. bursaria is benthic, it should be possible for various kinds of precipitated tiny particles to be taken up into the cell body during predation. In this study, microplastic (MP) beads with a diameter of 1 μm, which is about the same size as the algae, were mixed in the suspension medium of P. bursaria . It was observed that uptake of the beads into the cell body of P. bursaria started within 5 min after mixing, and the beads were observed inside P. bursaria even several days after the addition to the P. bursaria culture suspension. It is highly probable that the MP beads observed in the cell body somehow escaped from the food vacuole and moved into the cytoplasm. Departmental Bulletin Paper Full-Length Paper By a grant from Research Institute for Integrated Science, Kanagawa University 神奈川大学総合理学研究所 2020-10-30 eng departmental bulletin paper VoR http://hdl.handle.net/10487/00016655 https://kanagawa-u.repo.nii.ac.jp/records/13568 AA12068302 1880-0483 Science Journal of Kanagawa University 31 21 24 https://kanagawa-u.repo.nii.ac.jp/record/13568/files/04 Microplastic Beads Incorporated into a Single Cell ： Analyses Using the Green Paramecium, Paramecium bursaria.pdf application/pdf 1.3 MB 2021-01-08