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In page Monika Ritsch-Marte:

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In the scope of the ERC Advanced Investigator Grant catchIT (= Coherently Advanced Tissue and Cell Holographic Imaging and Trapping) her group also developed methods of optical manipulation of ever larger particles, e.g. the optical "macro-tweezers" system, a large volume dual-beam mirror trap.[citation needed] This dual-beam approach is suitable to trap and guide swimming microorganisms such as Euglena without inducing any optical damage. For even larger particles, a combination of optical tweezers and an ultrasonic trap was developed.