1. Plasma Physics Laboratory, National Institute of Physics, College of Science, University of the Philippines, Diliman, Quezon City 1101, Philippines
2. Department of Electrical Engineering, College of Engineering, Qassim University, Buraydah 51452, Kingdom of Saudi Arabia
3. Molecular Protozoology Laboratory, Natural Sciences Research Institute, College of Science, University of the Philippines, Diliman, Quezon City 1101, Philippines
4. Institute of Biology, College of Science, University of the Philippines, Diliman, Quezon City 1101, Philippines