PeerJ Author 135 Points Contributions by role Author 135 Contributions by subject area Ecology Freshwater Biology Jack JWA van Loon PeerJ Author Summary Bioengineering Biotechnology Environmental Sciences Past or current institution affiliations VU University Amsterdam Work details scientist Academic Center for Dentistry Amsterdam Dentistry gravity / space research scientist VU University Amsterdam Dentistry space / gravity research PeerJ Contributions Articles 1 January 4, 2019 Spiculous skeleton formation in the freshwater sponge Ephydatia fluviatilis under hypergravity conditions Martijn C. Bart, Sebastiaan J. de Vet, Didier M. de Bakker, Brittany E. Alexander, Dick van Oevelen, E. Emiel van Loon, Jack J.W.A. van Loon, Jasper M. de Goeij https://doi.org/10.7717/peerj.6055 PubMed 30631642