Maejo International Journal of Energy and Environmental Communication https://ph02.tci-thaijo.org/index.php/MIJEEC <p><span id="ContentBody_cBody_LabelAbout">Maejo International Journal of Energy and Environmental Communication (Maejo Int. J. Energ. Environ. Comm. or MIJEEC), the international journal for the publication of all preliminary communications in Environmental Science, Applied Science and Energy Engineering is one of the peer-refereed journals of Maejo University. ISSN: 2673-0537; ISSN: 2774-0064 (Online) Frequency: 3 issues/year.&nbsp;</span></p> en-US <p>Copyright © 2019 MIJEEC - Maejo International Journal of Energy and Environmental Communication, All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial- Attribution 4.0 International (CC BY 4.0) License</p> rameshprabu@mju.ac.th (Assoc. Prof. Dr. Rameshprabu Ramaraj) mijeec@mju.ac.th (Dr. Prakash Bhuyar) Thu, 05 Sep 2024 10:30:54 +0700 OJS 3.3.0.8 http://blogs.law.harvard.edu/tech/rss 60 Alkaline hydrolysis as a simple method for converting chicken manure fertilizer into feedstock for ectoine production by Halomonas elongata cell factory https://ph02.tci-thaijo.org/index.php/MIJEEC/article/view/254476 <p class="p1">Changes in dietary habits in modern-day Japan have led to a significant expansion in the country’s livestock industry. One notable change is the increased consumption of eggs due to their high-quality protein content and affordability. This significantly expanded the poultry industry to the extent that it raised environmental concerns, especially regarding the increased waste production. Major solid waste from the poultry industry is chicken manure (CM), commonly treated through composting into fertilizer. However, there is currently an oversupply of CM fertilizer globally due to a large amount of CM being produced. We address this issue by developing a simple alkaline hydrolysis method to convert the nitrogen-rich CM fertilizer into media for culturing bacterial cell factories. Our result shows that the high-salinity CM-derived media developed here can sustain the growth of <em>Halomonas elongata</em> OUT30018. This moderately halophilic bacterium biosynthesizes and accumulates valuable chemicals such as ectoine (ECT) in the cell. We observed that <em>H. elongata</em> OUT30018 cultured in a CM-derived medium containing 15% w/v NaCl could accumulate 335 μmol of ECT per g cell fresh weight (CFW), a concentration comparable to that obtained in the cells cultured in common synthetic media. Furthermore, this concentration was increased to 393 μmol/g CFW when the CM-derived medium was supplemented with 4% w/v xylose. The work reported here represents the initial stage of developing new technology for managing CM. Implementation of this technology would improve the sustainability of both the poultry and the fermentation industries.</p> Huynh Cong Khanh, Pulla Kaothien-Nakayama, Hideki Nakayama Copyright (c) 2024 Huynh Cong Khanh, Pulla Kaothien-Nakayama, Hideki Nakayama https://creativecommons.org/licenses/by-nc-nd/4.0 https://ph02.tci-thaijo.org/index.php/MIJEEC/article/view/254476 Tue, 04 Jun 2024 00:00:00 +0700 Dye-sensitized solar cells with nano TiO₂ quantum dots and foliar pigments: A review https://ph02.tci-thaijo.org/index.php/MIJEEC/article/view/255522 <p class="p1">The integration of plant pigments, quantum dots (QDs), and carbon nanotubes (CNTs) into dye-sensitized solar cells (DSSCs) is a notable progress in the effort to achieve carbon neutrality. Dye-sensitized solar cells (DSSCs) provide a sustainable alternative to conventional solar cells that depend on artificial dyes by utilizing renewable and environmentally friendly natural dyes produced from plant pigments. Quantum dots are employed to augment the effectiveness of light absorption in DSSCs, while carbon nanotubes promote electron transport and minimize charge recombination, resulting in a higher total efficiency. This integration not only decreases the environmental impact linked to the manufacturing of solar cells but also fosters a circular economy by utilizing agricultural by-products as sources of natural dyes. In addition, DSSCs have a reduced energy requirement for manufacturing compared to silicon-based solar cells, making them well-suited for widespread implementation in underdeveloped areas with insufficient infrastructure. Continued research and development efforts are focused on improving the performance and scalability of DSSCs. These technologies have the potential to be crucial in meeting global carbon neutrality targets and reducing the effects of climate change.</p> Maria Onyemowo Oteikwu, Rajeswaran Ramaraj, Sabarikirishwaran Ponnambalam, Obaid Ahmad Bhat, Yuwalee Unpaprom, Prakash Bhuyar, Rameshprabu Ramaraj Copyright (c) 2024 Maria Onyemowo Oteikwu, Rajeswaran Ramaraj, Sabarikirishwaran Ponnambalam, Obaid Ahmad Bhat, Yuwalee Unpaprom, Prakash Bhuyar, Rameshprabu Ramaraj https://creativecommons.org/licenses/by-nc-nd/4.0 https://ph02.tci-thaijo.org/index.php/MIJEEC/article/view/255522 Sat, 25 May 2024 00:00:00 +0700