Cultiu i desenvolupament in vitro d'embrions humans Authors Mark Grossmann Maria del Carme Pons Abstract During the past three decades the practice of clinical assisted reproduction have grown world-wide and moreover the success rate has increased thanks to clinical and laboratory improvements. Tradicionally, the morphological criteria has been applied to select embryos to transfer. However, the predictive value of this criteria is limited so that the multiple- embryo transfers are very common leading to a higher risc of multiple pregnancy. The goal in assisted reproduction is achieving a single pregnancy through the reduction of the number of embryos used in transfer to one. Single embryo transfer requires culture media to improve in order to allow the embryo selection in more advanced stages as well as having a reliable method to evaluate the embryo viability. Nowadays, strategies are carrying out in two different fields: the first one, continuing in morphometric criteria, it tends to use a sequencial scoring system from the oocyte through to the cleavage-stage embryo to allow selecting the most viable embryo in a cohort and the second one, in the research field, the development of new techniques based on the analysis of the embryo constitution and its metabolism. Downloads Text complet (Català) Published 2009-04-27 Issue 59, 2008 : Biologia de la reproducció / Mercè Durfort i Francesca Vidal, editores Section Articles License The intellectual property of the articles belongs to the respective authors. At the time of submitting the articles to Treballs de la Societat Catalana de Biologia, authors accept the following terms: — Authors assign to the SCB (a subsidiary of the Institut d’Estudis Catalans) the rights of reproduction, public communication (including communication through social networks) and distribution of the articles submitted for publication to Treballs de la Societat Catalana de Biologia, in any form and medium, including digital platforms. The Publications Committee reserves the right to accept or refuse submitted articles and the right to make any editorial changes it deems appropriate. If the suggested changes are accepted by authors, they should re-submit the article with such changes. — Authors answer to the SCB for the authorship and originality of submitted articles. In other words, authors assure that submitted articles do not contain fragments of works by other authors or fragments of their own previously published works; that the content of articles is original, and that the copyright of third parties is not infringed upon. Authors accept this responsibility and undertake to hold harmless the SCB for any loss or damage resulting from non-compliance with this obligation. Furthermore, they should include a statement in articles submitted to the journal regarding their responsibility for the content of the articles. — Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles, and they should moreover ensure that images, videos, etc., have been created with the consent of the individuals appearing in them, and that material belonging to third parties is clearly identified and acknowledged as such within the text. Likewise, authors should provide the respective consents and authorisations to the SCB when submitting articles. — The SCB is exempt from any liability arising from the possible infringement of intellectual property rights by authors. In all cases, it undertakes to publish corrections, clarifications, retractions and apologies, if necessary. — Unless otherwise stated in the text or in the graphic material, the contents published in the journal are subject to an Attribution - NonCommercial - NoDerivs 3.0 Spain (by-nc-nd) license from Creative Commons, the full text of which may be consulted at https://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Therefore, the general public is authorised to reproduce, distribute and communicate articles as long as their authorship and publishing entity are acknowledged, and no commercial use is made of them nor derivative work produced from them. — The journal is not responsible for the ideas and opinions expressed by the authors of published articles.
