Also publishes as (P. Karthikeyan Obulisamy, Obulisamy Parthiba Karthikeyan, Obulisamy P. Kartikeyan, Obulisamy P. Karthikeyan, Obulisamy Kartik, Obuli Parthiba Karthikeyan, Obuli P. Karthikeyan, Obuli Karthikeyan, O. Parthiba Karthikeyan, Kartik P. Obulisamy, Kartik Obulisamy)
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Karthikeyan, Obulisamy Parthiba, Chidambarampadmavathy, Karthigeyan, Nadarjan, Saravanan, and Heimann, Kirsten (2016) Influence of nutrients on oxidation of low level methane by mixed methanotrophic consortia. Environmental Science and Pollution Research, 23 (5). pp. 4346-4357.
Obulisamy, P. Karthikeyan, Chidambarampadmavathy, Karthigeyan, Nadarajan, Saravanan, Lee, Patrick K.H., and Heimann, Kirsten (2015) Effect of CH₄/O₂ ratio on fatty acid profile and polyhydroxybutyrate content in a heterotrophic-methanotrophic consortium. Chemosphere, 141. pp. 235-242.
Nguyen Hao, Hoang-Tuong, Karthikeyan, Obulisamy Parthiba, and Heimann, Kirsten (2015) Bio-refining of carbohydrate-rich food waste for biofuels. Energies, 8 (7). pp. 6350-6364.
Karthikeyan, Obulisamy P., Rajasekar, Aruliah, and Balasubramanian, Rajasekhar (2015) Bio-oxidation and bio-cyanidation of refractory mineral ores for gold extraction: a review. Critical Reviews in Environmental Science and Technology, 45. pp. 1611-1643.
Chidambarampadmavathy, Karthigeyan, Obulisamy, Kartik P., and Heimann, Kirsten (2015) Biopolymers made from methane in bioreactors. Engineering in Life Sciences, 15 (7). pp. 689-699.
Karthikeyan, O.P., Karthigeyan, C.P., Cirés, Samuel, and Heimann, Kirsten (2015) Review of sustainable methane mitigation and bio-polymer production. Critical Reviews in Environmental Science and Technology, 45. pp. 1579-1610.
Chidambarampadmavathy, Karthigeyan, Kartikeyan, Obulisamy P., and Heimann, Kirsten (2015) Role of copper and iron in methane oxidation and bacterial biopolymer accumulation. Engineering in Life Sciences, 15. pp. 387-399.
Razaghi, Ali, Kartik, Obulisamy, Owens, Leigh, and Heimann, Kirsten (2014) Methane oxidation by the oleaginous yeast, Rhodotorula glutinis – fact or fiction? In: [Presented at the North Queensland Festival of Life Sciences 2014]. From: North Queensland Festival of Life Sciences 2014, 5 November 2014, Townsville, QLD, Australia.
Karthikeyan, Obuli P., and Visvanathan, C. (2013) Bio-energy recovery from high-solid organic substrates by dry anaerobic bio-conversion processes: a review. Reviews in Environmental Science and Biotechnology, 12 (3). pp. 257-284.
Zeshan, , Karthikeyan, Obuli, and Visvanathan, Chettiyappan (2012) Effect of C/N ratio and ammonia-N accumulation in a pilot-scale thermophilic dry anaerobic digester. Bioresource Technology, 113. pp. 294-302.
Xu, S.Y., Karthikeyan, O.P., Selvam, A., and Wong, J.W. (2012) Effect of inoculum to substrate ratio on the hydrolysis and acidification of food waste in leach bed reactor. Bioresource Technology, 126. pp. 425-430.
Wong, Jonathan W.C., Selvam, Ammaiyappan, Zhao, Zhenyong, Karthikeyan, Obuli. P., Man Yu, Shuk, Law, Alex C.W., and Chung, Patricia C.P. (2012) In-vessel co-composting of horse stable bedding waste and blood meal at different C/N ratios: process evaluation. Environmental Technology, 33 (22). pp. 2561-2567.
Karthikeyan, Obulisamy Parthiba, Joseph, Kurian, and Esakku, S. (2012) Methane emission potential of open dumps in Chennai: a case study. International Journal of Environmental Technology and Management, 15 (3/4/5/6). pp. 291-304.
Xu, Su Yun, Lam, Hoi Pui, Karthikeyan, O. Parthiba, and Wong, Jonathan W.C. (2011) Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: effect of pH and bulking agent. Bioresource Technology, 102 (4). pp. 3702-3708.
Swati, M., Karthikeyan, O.P., Joseph, Kurian, Visvanathan, C., and Nagendran, R. (2011) Pilot-scale simulation of landfill bioreactor and controlled dumping of fresh and partially stabilized municipal solid waste in a tropical developing country. Journal of Hazardous, Toxic, and Radioactive Waste, 15 (4). pp. 321-330.
Nithikul, Jidapa, Karthikeyan, Obuli P., and Visvanathan, C. (2011) Reject management from a mechanical biological treatment plant in Bangkok, Thailand. Resources, Conservation and Recycling, 55. pp. 417-422.
Visvanathan, C., Karthikeyan, Obuli P., and Park, K.H. (2011) Sustainable landfilling in tropical conditions: comparison between open and closed cell approach. Waste Management and Research, 29 (4). pp. 386-396.
Sri Shalini, S., Karthikeyan, Obuli P., and Joseph, Kurian (2010) Biological stability of municipal solid waste from simulated landfills under tropical environment. Bioresource Technology, 101 (3). pp. 845-852.
Visvanthan, C., Yin, Nang Htay, and Karthikeyan, Obuli P. (2010) Co-disposal of electronic waste with municipal solid waste in bioreactor landfills. Waste Management, 30 (12). pp. 2608-2614.
Ganesh, G., Karthikeyan, Obuli, and Joseph, Kurian (2010) Enhancing the hydrolysis step in anaerobic digestion of municipal solid waste using rumen fluid. International Journal of Environmental Technology and Management, 13 (3/4). pp. 311-321.
Esakku, S., Karthikeyan, O.P., Joseph, Kurian, and Nagendran, R. (2008) Heavy metal fractionation and leachability studies on fresh and partially decomposed municipal solid waste. Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management, 12 (2). pp. 127-132.
Karthikeyan, O.P., and Joseph, K. (2008) Chemical precipitation of ammonia-N as struvite from landfill leachate effect of molar ratio upon recovery. Journal of Solid Waste Technology and Management, 34 (1). pp. 20-26.
Karthikeyan, Obuli Parthiba, Murugesan, S., Joseph, Kurian, and Nagendran, R. (2008) Leaching of inorganic pollutants from fresh and partially degraded municipal solid waste: a lysimeter study under tropical conditions. International Journal of Environment and Waste Management, 2 (1/2). pp. 49-64.