1. Gao, Y., X. Wang, J. Li, C. Tin Lee, P. Ying Ong, Z. Zhang, and C. Li, Effect of aquaculture salinity on nitrification and microbial community in moving bed bioreactors with immobilized microbial granules. Bioresource Technology, 2019: p. 122427.(IF: 6.667)
  2. Sanadi, N.F.A., Y. Van Fan, C.T. Lee, N. Ibrahim, C. Li, Y. Gao, P.Y. Ong, and J.J. Klemes, Nutrient in Leachate of Biowaste Compost and its Availability for Plants. Chemical Engineering Transactions, 2019. 76: p. 1369-1374.
  3. Pei Ying Ong, Suhir Sulaiman, Zulaikha Sarobo, Hajar Aminah A.Karim, Mohd Nadzreen Hidayat Bin Sarjuni, Hong Yeng Leong, Muhammad Helmi Bin Nadri, Cheng Kian Kai, Mohamad Roji Sarmidi (2018). Influences of Integrated use of Soil Enhancer on the Soil Enzymatic Activities in Polyculture Cropping System. 7th international Conference on Biotechnology for the wellness industry (7th ICBWI 2018), UTM KL.
  4. Norfakhrina Mohd Noor, N. A. M. R., Ong Pei Ying, Muhamad Helmi bin Nadri, Cheng Kian Kai and Leong Hong Yeng (2018). Influence of Nutrient Management on Crop Yield In Polyculture System. 7th International Conference on Biotechnology for the Wellness Industry, Conferences Proceeding.
  5. Ong, P. Y., C. T. Lee, M. R. Sarmidi, H. M. Awad, L. S. Chua and F. Razali (2013). Production of Extracellular 5-Aminolevulinic Acid by Rhodopseudomonas Palustris in Solid-State Fermentation. Developments in Sustainable Chemical and Bioprocess Technology. R. Pogaku, A. Bono and C. Chu, Springer US: 173-179.
  6. P.Y. Ong, C. T. L., M.R. Sarmidi, H.M. Awad, L.S. Chua and F.Razali (2012). Production of Extracellular 5-Aminolevulinic Acid by Rhodopseudomonas palustris in Solid State Fermentation. 26th Symposium of Malaysian Chemical Engineers (Somche-2012) In Conjunction with 4th International Conference on Chemical and Bioprocess Engineering (ICCBPE-2012), the Pacific Sutera Hotel, Kota Kinabalu, Sabah, Malaysia.
  7. Pei Ying Ong, C. T. L., Nur Mizatul Hidayah Binti Ismail, Chee Who Leow, Li Yee Lim, Lee Suan Chua and Mohamad Roji Sarmidi (2013). Enzymatic assay for compost from oil palm empty fruit bunch inoculated with Rhodopseudomonas palustris. The 25th Annual Meeting of The Thai Society for Biotechnology and International Conference (TSB,2013). The Emeraid Hotel, Bangkok, Thailand.