Microsoft Word - Preface.docx Science & Technology Indonesia Preface 1 Preface Volume 2 Number 3 July 2017 Science and Technology Indonesia issue volume 2 no 3 July 2017 is recently online available. Please cite the article freely. The topic in this field is also chemistry. Science and Technology Indonesia is consistent for five articles published until this issue. We hope the article can be published more to enlarge the scope and scientist reader. We also invite all researchers in the world to submit article to Science and Technology. The article will be reviewed by corresponding scientist according to the field of article. For that aim, please see our guideline for author, which has available in the homepage of journal. Please feel free to contact us for further information. Editorial board.