%0 Journal Article %T Semistability of certain bundles on a quintic Calabi-Yau threefold %A Maria Chiara Brambilla %J Mathematics %D 2005 %I arXiv %X In the paper ``Chirality change in string theory'', by Douglas and Zhou, the authors give a list of bundles on a quintic Calabi-Yau threefold. Here we prove the semistability of most of these bundles. This provides examples of string theory compactifications which have a different number of generations and can be connected. %U http://arxiv.org/abs/math/0509599v1