Publications

Title: Molecular detection of Toxoplasma gondii in irrigation waters and agricultural soils of Central Luzon, Philippines: implications to human health
Authors: Cielo Emar M. Paraoan- Villareal, Camille Ann G. Santos, Marie Christine M. Obusan
Date Published: November 2025
Link/DOI: https://doi.org/10.1080/03601234.2025.2591996

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Title: Updated draft genome sequence of Streptomyces sp. isolate H28 from the Meycauayan River, Philippines
Authors: Hanna Hasmin T. Estadilla, Aroin B. Verdera, Arizaldo E. Castro, Kohsuke Honda, Marie Christine M. Obusan
Date Published: October 2025
Link/DOI: https://doi.org/10.1128/mra.00174-25


Title: Three new species and a record of pheretemoid earthworms (Crassiclitellata, Megascolecidae) from Misamis Oriental, Philippines, with data from the mitochondrial genome
​Authors: Nonillon M. Aspe, Huifeng Zhao, Maria Reynalen F. Mapile, Marie Christine M. Obusan, Yufeng Zhang, Edgar Castañares, Eric John D. Florida, Donghui Wu
Date Published: February 2025
Link/DOI: https://doi.org/10.3897/zse.101.135702


Title: A Review of Regulatory Frameworks for Biobanking in Southeast Asia
​Authors: Plebeian B. Medina, Subasri Armon, Mohammad Firdaus Bin Abdul Aziz, Io Hong Cheong, Marian P. de Leon, Sonia Drobysz, Muhd Haziq Fikry Bin Haji Abdul Momin, Debra Leiolani Garcia, Diah Iskandriati, Zisis Kozlakidis, Lin Cui, Seanghorn Mao, Mary Elizabeth Miranda, Khin Mar Mya, Lingeswran Nallenthiran, Marie Christine Obusan, Kongchay Phimmakong, Phyu Sabai, Channada Saejung, Hans Prakash Sathasivam, Faizatul Lela Binti Jafar, Rodel Jonathan S. Vitor, Ailyn M. Yabes, Alan B. Calaor, Viji Vijayan and Raymond T. P. Lin
Date Published: September 2024
Link/DOI: https://doi.org/10.1089/bio.2024.0044


Title: Predictive Functional Profiling Reveals Putative Metabolic Capacities of Bacterial Communities in Drinking Water Resources and Distribution Supply in Mega Manila, Philippines
Authors: Arizaldo E. Castro, Marie Christine M. Obusan
Date Published: August 2024
Link/DOI: https://doi.org/10.3390/w16162267


Title: Spatiotemporal variation of stranded marine mammals in the Philippines from 2005 to 2022: Latest stranding hotspots and species stranding status
Authors: Lemnuel V. Aragones, Alessandra Nicole L. Morado, Marie Christine M. Obusan, Honey Leen M. Laggui, Jonah L. Bondoc, Leo Jonathan A. Suarez, and Ewen Kye Lawler
Date Published: July 2024
Link/DOI: https://doi.org/10.1578/AM.50.4.2024.302


​​Title: 16S metabarcoding of the bacterial community of a poultry wastewater treatment plant in the Philippines
Authors: Mary Ann Relucio-San Diego, Paul Christian T. Gloria, and Marie Christine M. Obusan
Date Published: May 2024
Link/DOI: https://doi.org/10.3389/fenvs.2024.1390323


Title: Bacterial community profiles of select tributaries of Laguna Lake in the Philippines
Authors: Arizaldo E. Castro, Andrew D. Montecillo, Ren Mark D. Villanueva, and Marie Christine M. Obusan
Date Published: April 2024
Link/DOI: https://doi.org/10.1128/mra.01161-23

Title: Molecular Detection and Prevalence of Toxoplasma gondii in Ready-to-eat Vegetables and Oysters in Central Luzon, Philippines
Authors: Cielo Emar M. Paraoan, Ren Mark D. Villanueva, and Marie Christine M. Obusan
Date Published: October 2023
Link/DOI: https://doi.org/10.56899/152.05.36


Title: Vermicast Analysis with the Earthworm Species 𝘗𝘩𝘦𝘳𝘦𝘵𝘪𝘮𝘢 𝘭𝘰𝘴𝘣𝘢𝘯𝘰𝘴𝘦𝘯𝘴𝘪𝘴 (Crassiclitellata: Megascolecidae): Bacterial Profiles for Potential Applications in Agriculture
Authors: Reynalen Mapile, Nonillon Aspe, and Marie Christine Obusan
Date Published: September 2023
Link/DOI: https://doi.org/10.3390/app131810364


Title: Cetacean Morbillivirus in a Risso's Dolphin (Grampus griseus) that Stranded in the West Coast of Luzon Island, Philippines
Authors: Leo Jonathan A. Suarez, Antoinette T. Guy, Marie Christine M. Obusan, Lemnuel V. Aragones, Christopher S. Torno
Date Published: June 2023
Link/DOI: https://pjvm-ph.org/par21032023/?fbclid=IwAR1czcRoAy8wppOoOsYkjd1qKC7gfSOsCnwm5_ZlW-lfqR48iubM4pdj6E8


Title: Water Quality Index as a tool for assessing the water quality of the Laguna de Bay from 2020 to 2021
Authors: Pierre Angeli P. Barbaso, Arizaldo E. Castro and Marie Christine M. Obusan
Date Published: June 2023
Link/DOI: https://scienggj.org/2023-223/


Title: Physico-Chemical Quality and Physiological Profiles of Microbial Communities in Freshwater Systems of Mega Manila, Philippines
Authors: Marie Christine M. Obusan, Arizaldo E. Castro, Ren Mark D. Villanueva, Margareth Del E. Isagan, Jamaica Ann A. Caras, and Jessica F. Simbahan 
Date Published: June 2023
Link/DOI: https://doi.org/10.3390/data8060103


Title: Microbial quality and emerging pollutants in freshwater systems of Mega Manila, Philippines: a scoping review
Authors: Arizaldo E. Castro and Marie Christine M. Obusan
Date Published: May 2023
Link/DOI: https://doi.org/10.1080/1573062X.2023.2209559


Title: Host-Associated Bacteroides 16S rDNA-Based Markers for Source Tracking of Fecal Pollution in Laguna Lake, Philippines
Authors: Gicelle T. Malajacan, Mae Ashley G. Nacario, Marie Christine M. Obusan and Windell L. Rivera
Date Published: April 2023
Link/DOI: https://doi.org/10.3390/microorganisms11051142

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​Title: Pheretimoid earthworms (Clitellata: Megascolecidae) cultivated in a vermifacility in Los Baños, Laguna, Philippines, with description of a new species.
Authors: Nonillon M. Aspe, and Marie Christine M. Obusan
Date Published: March 2023
Link/DOI: https://doi.org/10.11646/zootaxa.5255.1.14

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Title: Streptomyces coriariae sp. nov., a novel streptomycete isolated from actinorhizal nodules of Coriaria intermedia
Authors: Berckx, F, Bandong, CM, Wibberg, D, Kalinowski, J, Willemse, J, Brachmann, A, Simbahan, J and Palowski, K
Date Published: December 2022
Link/DOI: https://doi.org/10.1099/ijsem.0.005603


Title: A tale of two lineages: how the strains of the earliest divergent symbiotic Frankia clade spread over the world
Authors: Berckx, F, Nguyen, TV, Bandong, CM, Lin, HH, Takashi Yamanaka, T, Katayama, S, Wibberg, D, Blom, J, Kalinowski, J, Tateno, M, Simbahan, J, Liu, CT, Brachmann, A, and Palowski, K
Date Published: August 2022
Link/DOI: https://doi.org/10.1186/s12864-022-08838-5


Title: Methods used in microbial forensics and epidemiological investigations for stronger health systems
Authors: Arizaldo E. Castro & Maria Corazon A. De Ungria
Date Published: March 2022
Link/DOI: https://doi.org/10.1080/20961790.2021.2023272


Title: Diaporthe/Phomopsis longicolla degrades an array of bisphenol analogues with secreted laccase
Authors: Jobriell C. Baluyot, Hanna Keith Santos, Dessa Camille R. Batoctoy, Vicenzo Paolo M. Torreno, Leela B. Ghimire, Santiago Emil A. Joson IV, Marie Christine M. Obusan, Eizadora T. Yu, Dennis B. Bela-ong, Roy R. Gerona, Michael C. Velarde
Date Published: April 2022
Link/DOI: https://doi.org/10.1016/j.micres.2022.126973


Title: Bacteriological and histopathological findings in cetaceans that stranded in the Philippines from 2017 to 2018
Authors: Marie Christine M. Obusan, Jamaica Ann A. Caras, Lara Sabrina L. Lumang, Erika Joyce S. Calderon, Ren Mark D. Villanueva, Cristina C. Salibay, Maria Auxilia T. Siringan, Windell L. Rivera, Joseph S. Masangkay, & Lemnuel V. Aragones
Date Published: November 2021
Link/DOI: https://doi.org/10.1371/journal.pone.0243691​


Title: Library independent source tracking of fecal contamination in selected stations and tributaries of Laguna Lake, Philippines. 
Authors: Joseth Jermain M. Abello, Gicelle T. Malajacan, Kevin L. Labrador, Mae Ashley G. Nacario, Luiza H. Galarion, Marie Christine M. Obusan, & Windell L. Rivera
Date Published: September 2021
Link/DOI: https://doi.org/10.2166/wh.2021.058​​

​Title: The earthworm fauna of Palawan, Philippines with description of nineteen new pheretimoid species (Clitellata: Megascolecidae)
Authors: Nonillon M. Aspe, Rafael Ethan Manasan, Albert B. Manlavi, Ma. Lotus E. Patiluna, Maria Asela B. Sebido, Marie Christine M. Obusan, Jessica F. Simbahan & Samuel W. James
Date Published: July 2021
Link/DOI: doi.org/10.1080/00222933.2021.1923849


Title: Antimicrobial activity of endophytic and rhizospheric fungi associated with Soft Fern (Christella sp.) and Cinderella Weed (Synedrella nodiflora) inhabiting a hot spring in Los Baños, Laguna, Philippines
Authors: Rio Janina B. Arenas, Ren Mark D. Villanueva, Jessica F. Simbahan, and Maria Christine M. Obusan 
Date Published: June 2021
Link/DOI: doi.org/10.47895/amp.vi0.1417


​Title: Draft genome sequence of Streptomyces sp. Isolate H28 from the Meycauayan River, Philippines
Authors: Aroin B. Verdera, Andrew D. Montecillo, and Marie Christine M. Obusan
Date Published: January 2021
Link/DOI: doi.org/10.1128/MRA.01269-20


Title: Molecular detection of Toxoplasma gondii in select cetaceans stranded in the Philippines
Authors: Raphael Joshua C. De Guzman, Lemnuel V. Aragones, and Marie Christine M. Obusan
Date Published: December 2020 
Link/DOI: scienggj.org/2020-206/


Title: Marilao-Meycauayan-Obando River System (MMORS) harbors multidrug-resistant bacteria indicating high risk of antimicrobial contamination
Authors: Sarah Jean G. Supnet, Eloisa Victoria M. Caballero, Raymond H. Parcon, and Jessica F. Simbahan
Date Published: December 2020 
Link/DOI: https://scienggj.org/2020/PSL%202020-vol13-no02-p198-205-Supnet%20et%20al.pdf​


Title: Variations in enzymatic activity and response to abiotic factors of endophytic bacteria isolated from Narra (Pterocarpus indicus) growing in a forest environment and urban arboretum
Authors: Liezel D.C. Atole, Margareth Del E. Isagan, Raymond H. Parcon, Virgie A. Alcantara, Jocelyn T. Zarate, and Jessica F. Simbahan
Date Published: November 2020 
Link/DOI: https://scienggj.org/2020-special-issue-12/


Title: Mineralization, biodegradation, and antagonistic activities of gut-associated bacteria and fungi of African Nightcrawler, Eudrilus eugeniae (Kinberg, 1867)
Authors: Maria Reynalen F. Mapile and Marie Christine M. Obusan
Date Published: September 2020
Link/DOI: journals.upd.edu.ph/index.php/sciencediliman/article/view/7215


Title: Leptospira spp. and Toxoplasma gondii in stranded representatives of wild cetaceans in the Philippines
Authors: Marie Christine M. Obusan, Ren Mark D. Villanueva, Maria Auxilia T. Siringan, Windell L. Rivera and
Lemnuel V. Aragones
Date Published: October 2019
Link/DOI: doi.org/10.1186/s12917-019-2112-5

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Title: Bacillus amyloliquefaciens, a Narra (Pterocarpus indicus) leaf endophyte, possesses antifungal activity against phytopathogenic fungi due to laminarinase activity and production of antimicrobial compounds
Authors: Raymond H. Parcon, Margareth Del E. Isagan, Liezel D.C. Atole, Virgie A. Alcantara, and Jessica F. Simbahan
Date Published: July 2019
Link/DOI: https://scienggj.org/2019/PSL%202019%20Special%20Issue%2004-Parcon%20et%20al.pdf