Fig. 9

A Manipulation of CHO-K1 cell sheets with UV irradiation and temperature: microscopic images of photoresponsive culture surface before (left) and after (middle) regional UV irradiation followed by the low-temperature washing, and after second regional UV irradiation followed by the low-temperature washing (right). Yellow rectangles indicate UV-irradiated regions [144]. B SEM pictures of injectable nanogels formed by chitosan–PNiPAAm copolymers (left): SEM micrographs of chitosan–PNiPAAm hydrogel scaffold and hydrogel scaffold after temperature cycling between 25 and 37°C 100 times (up), chondrocytes and meniscus cells cultured in chitosan–PNiPAAm hydrogel scaffolds for 21 days (bottom) [254]