The standard abstract submission is closed now. However, there is still a possibility to submit post-deadline posters. Please inform your colleagues and co-workers that the deadline for such presentations is February 24, 2020. If you will have some new results on optical chemical sensors and biosensors do not hesitate to submit a new abstract. We guaranty that the post-deadline posters will be included in the conference program and in the book of abstracts. The presenter of the post-deadline poster is allowed to register for the conference at early bird registration fee.