Politics and government 828 Psychological aspects 502 Prices 345 Purification 300 Psychology 243 Pollution 207 Polymers 190 Public health 172 Political aspects 170 Personnel management 158 Prevention 157 Palm oil 156 Planning 155 Philosophy 149 Physiology 141 Palm oil industry 129 Physiological effect 120 Plants 117 Project management 116 Political parties 106 Polyelectrolytes 101 Phonetics 99 Political activity 90 Public administration 89 Poverty 85 Performance 83 Punishment (Islamic law) 81 Patients 80 Photovoltaic power systems 80 Phonology 78 Primary Health Care 78 Physical education and training 76 Public housing 71 Pattern recognition systems 70 Pesticides 70 Protection 68 Polymerization 67 Production management 66 Property (Islamic law) 65 Politeness (Linguistics) 64 Physiological aspects 63 Problem solving 63 Privatization 62 Petroleum industry and trade 61 Proteins 61 Plant tissue culture 59 PID controllers 58 Photovoltaic power generation 58 Physics 58 Parenting 57 Publishers and publishing 57 Prayer 56 Pharmacology 54 Polymeric composites 53 Pregnancy 53 Phylogeny 51 Plants, Medicinal 51 Polymerase chain reaction 51 Process control 51 Press coverage 50 Professional ethics 50 Pathology 49 Pragmatics 49 Public opinion 49 Parent participation 48 Petroleum 47 Preschool children 47 Poor 46 Portfolio management 46 Programming 46 Phytochemicals 45 Private universities and colleges 45 Political science 43 Pediatrics 42 Photonics 41 Power electronics 40 Periodontal Diseases 39 Polyethylene 39 Polyurethanes 39 Parasites 38 Proteomics 38 Purchasing 38 Political and social views 37 People with disabilities 36 Plant Extracts 36 Publishing 36 Performance standards 35 Peptides 34 Poetry 34 Political participation 34 Population 34 Prosthesis 34 Philosophy, Islamic 33 Police 33 Properties 33 Papaya 32 Partnership (Islamic law) 32 Personality 32 Particles 31 Problem-based learning 31