Label-free metabolic imaging and energy costs in Chlamydomonas Martine Boccara, Katia Wostrikoff, Benjamin Bailleuil and Claude Boccara Eur. Phys. J. E, 48 6-7 (2025) 38 Published online: 11 July 2025 DOI: 10.1140/epje/s10189-025-00499-y