EKSAKTA: Berkala Ilmiah Bidang MIPA http://eksakta.ppj.unp.ac.id/index.php/eksakta <p>EKSAKTA&nbsp;<em>Berkala Ilmiah Bidang MIPA</em>&nbsp;&nbsp;is an open access journal and peer-reviewed that publishes either original article or reviews. The journal is dedicated towards dissemination of knowledge related to the advancement in scientific research. The prestigious interdisciplinary editorial board reflects the diversity of subjects covered in this journal. Under the realm of science and technology, the coverage includes environmental science, pure and applied mathematics, agricultural research and engineering, biology, biotechnology, bioinformatics, Healthcare sciences (including clinical medicine, preventive medicine &amp; public health), physics, biophysics, computer science, chemistry and bioengineering, to name a few. This Journal Is Published at 6 Month intervals On April and October</p> Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang en-US EKSAKTA: Berkala Ilmiah Bidang MIPA 1411-3724 <p>Copyright @2017. This is an open-access article distributed under the terms of the Creative Commons&nbsp;Attribution-NonCommercial-ShareAlike 4.0 International License (<a href="http://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank" rel="noopener">http://creativecommons.org/licenses/by-nc-sa/4.0/</a>) which permits unrestricted non-commercial use, distribution and reproduction in any medium&nbsp;</p> Comparison of Corrosion Rate in the Environment of 10% Acetic Acid solution with different Deflection. http://eksakta.ppj.unp.ac.id/index.php/eksakta/article/view/190 <p>The oil and gas industry exploration that will generally be followed by corrosive substances including sweet gas (eg H2S and CO2), it will result in corrosion event. The corrosion stress cracking will cause the carbon steel pipe to break so that production oil and gas can be stopped. The research aims in this paper is to analyze the corrosion event of carbon steel pipe in laboratory scale on acid environment with the existence of sweet gas H2O and CO2 by using three points loading method. This research uses carbon steel pipe API 5L-X65 which stay in condensation environment of 1350 ml aquades, 150 ml acetic acid. Based on the figure (5.a) and figure (5.b) that the corrosion rate will increase with increasing exposure time, and the greater the stress that is given, the corrosion rate increases according to the image (6.a) and image (6.b). Whereas based on the results of microstructural tests using optical microscopes, pitting corrosion occurs, and corrosion events&nbsp; occur are the stress corrosion cracking transgranular and intergranular based on figure 8.</p> <p>&nbsp;</p> Nendi Suhendi Syafei S S Rizki Suryaningsih Suryaningsih Darmawan Hidayat ##submission.copyrightStatement## 2019-08-31 2019-08-31 20 2 84 93 10.24036/eksakta/vol20-iss2/190 Bacterial Isolation Which is Potential as Cellulosa Pedegradation in Coastal Performance In Tanjungpinang City http://eksakta.ppj.unp.ac.id/index.php/eksakta/article/view/206 <p>Many black water or feces and urine field observations in Tanjung Pinang City were dumped directly into the ditches, rivers, and sea. This proves that the management of domestic liquid waste in the City of Tanjungpinang, especially black water, has not yet received serious attention, resulting in a decline in environmental quality. One of the stages in processing black water is decomposition. The decomposition process can be assisted by bacteria, one of which is cellulose-degrading bacteria. This study aims to find bacterial isolates that have the potential to degrade cellulose in feces from coastal soils in Tanjung Pinang City. This research is a laboratory experimental research. The results of this study were obtained 16 bacterial isolates that can degrade cellulose. From these 16 isolates, 3 genera of bacteria were obtained, namely Pseudomonas, Acetobacter and Acinetobacter. Keywords: Cellulose Degradation Bacteria, Coastal Soil&nbsp;&nbsp;</p> Iwan Iskandar Hevi Horiza ##submission.copyrightStatement## 2019-08-31 2019-08-31 20 2 70 83 10.24036/eksakta/vol20-iss2/206