Topics.

• Orbital Angular Momentum in Optics 10 works
• Organ and Tissue Transplantation Research 66 works
• Organ Donation and Transplantation 220 works
• Organic Electronics and Photovoltaics 54 works
• Organic Food and Agriculture 40 works
• Organic Light-Emitting Diodes Research 42 works
• Organizational and Employee Performance 30 works
• Organizational Leadership and Management Strategies 18 works
• Organizational Learning and Leadership 27 works
• Organoboron and organosilicon chemistry 10 works
• Organometallic Complex Synthesis and Catalysis 20 works
• Organoselenium and organotellurium chemistry 12 works
• Organ Transplantation Techniques and Outcomes 599 works
• Oropharyngeal Anatomy and Pathologies 38 works
• Orthodontics and Dentofacial Orthopedics 79 works
• Orthopaedic implants and arthroplasty 397 works
• Orthopedic Infections and Treatments 249 works
• Orthopedic Surgery and Rehabilitation 258 works
• Osteoarthritis Treatment and Mechanisms 443 works
• Osteomyelitis and Bone Disorders Research 36 works
• Otitis Media and Relapsing Polychondritis 131 works
• Otolaryngology and Infectious Diseases 62 works
• Outsourcing and Supply Chain Management 28 works
• Ovarian cancer diagnosis and treatment 431 works
• Ovarian function and disorders 402 works
• Oxidative Organic Chemistry Reactions 24 works
• Pain Management and Opioid Use 298 works
• Pain Management and Placebo Effect 169 works
• Pain Management and Treatment 183 works
• Pain Mechanisms and Treatments 408 works
• Paleopathology and ancient diseases 14 works
• Palliative and Oncologic Care 28 works
• Palliative Care and End-of-Life Issues 565 works
• Pancreatic and Hepatic Oncology Research 1,097 works
• Pancreatic function and diabetes 639 works
• Pancreatitis Pathology and Treatment 716 works
• PAPR reduction in OFDM 19 works
• Parallel Computing and Optimization Techniques 51 works
• Paranormal Experiences and Beliefs 18 works
• Paraoxonase enzyme and polymorphisms 54 works
• Paraquat toxicity studies and treatments 16 works
• Parasite Biology and Host Interactions 55 works
• Parasites and Host Interactions 124 works
• Parasitic Diseases Research and Treatment 34 works
• Parasitic Infections and Diagnostics 43 works
• Parasitic infections in humans and animals 43 works
• Parathyroid Disorders and Treatments 565 works
• Parental Involvement in Education 58 works
• Parkinson's Disease and Spinal Disorders 173 works
• Parkinson's Disease Mechanisms and Treatments 1,037 works
• PARP inhibition in cancer therapy 247 works
• Participatory Visual Research Methods 46 works
• Particle accelerators and beam dynamics 15 works
• Particle Detector Development and Performance 50 works
• Particle Dynamics in Fluid Flows 29 works
• Particle physics theoretical and experimental studies 135 works
• Parvovirus B19 Infection Studies 115 works
• Pathogenesis and Treatment of Hiccups 34 works
• Patient Dignity and Privacy 59 works
• Patient-Provider Communication in Healthcare 350 works
• Patient Safety and Medication Errors 278 works
• Patient Satisfaction in Healthcare 215 works
• Peanut Plant Research Studies 63 works
• Peatlands and Wetlands Ecology 20 works
• Pectus Deformity Diagnosis and Treatment 16 works
• Pediatric health and respiratory diseases 201 works
• Pediatric Hepatobiliary Diseases and Treatments 277 works
• Pediatric Pain Management Techniques 269 works
• Pediatric Urology and Nephrology Studies 249 works
• Peer-to-Peer Network Technologies 20 works
• Pelvic and Acetabular Injuries 160 works
• Pelvic floor disorders treatments 547 works
• Peptidase Inhibition and Analysis 278 works
• Per- and polyfluoroalkyl substances research 440 works
• Perfectionism, Procrastination, Anxiety Studies 76 works
• Pericarditis and Cardiac Tamponade 91 works
• Periodontal Regeneration and Treatments 139 works
• Peripheral Artery Disease Management 759 works
• Peripheral Nerve Disorders 99 works
• Peripheral Neuropathies and Disorders 232 works
• Perovskite Materials and Applications 131 works
• Peroxisome Proliferator-Activated Receptors 233 works
• Persona Design and Applications 14 works
• Personal Information Management and User Behavior 15 works
• Personality Disorders and Psychopathology 208 works
• Personality Traits and Psychology 49 works
• Pesticide and Herbicide Environmental Studies 88 works
• Pesticide Exposure and Toxicity 252 works
• Pesticide Residue Analysis and Safety 37 works
• Petri Nets in System Modeling 26 works
• Petroleum Processing and Analysis 14 works
• Phagocytosis and Immune Regulation 151 works
• Pharmaceutical and Antibiotic Environmental Impacts 203 works
• Pharmaceutical Economics and Policy 173 works
• Pharmaceutical industry and healthcare 66 works
• Pharmaceutical Practices and Patient Outcomes 374 works
• Pharmaceutical Quality and Counterfeiting 34 works
• Pharmaceutical studies and practices 220 works
• Pharmacogenetics and Drug Metabolism 219 works
• Pharmacological Effects and Assays 57 works
• Pharmacological Effects and Toxicity Studies 405 works
• Pharmacological Effects of Medicinal Plants 29 works
• Pharmacological Effects of Natural Compounds 153 works
• Pharmacological Receptor Mechanisms and Effects 93 works
• Pharmacology and Nanomedicine Research 17 works
• Pharmacology and Obesity Treatment 210 works
• Pharmacovigilance and Adverse Drug Reactions 138 works
• Pharmacy and Medical Practices 38 works
• Phase Change Materials Research 40 works
• Phase Equilibria and Thermodynamics 16 works
• Phenothiazines and Benzothiazines Synthesis and Activities 17 works
• Phonetics and Phonology Research 139 works
• Phonocardiography and Auscultation Techniques 67 works
• Phosphodiesterase function and regulation 69 works
• Phosphorus and nutrient management 29 works
• Photoacoustic and Ultrasonic Imaging 132 works
• Photochemistry and Electron Transfer Studies 21 works
• Photochromic and Fluorescence Chemistry 29 works
• Photodynamic Therapy Research Studies 116 works
• Photonic and Optical Devices 58 works
• Photonic Crystal and Fiber Optics 20 works
• Photonic Crystals and Applications 28 works
• Photopolymerization techniques and applications 16 works
• Photoreceptor and optogenetics research 116 works
• Photosynthetic Processes and Mechanisms 149 works
• Photovoltaic System Optimization Techniques 62 works
• Photovoltaic Systems and Sustainability 18 works
• Physical Activity and Health 500 works
• Physical Education and Gymnastics 10 works
• Physical Education and Pedagogy 53 works
• Physical Education and Training Studies 14 works
• Physical Unclonable Functions (PUFs) and Hardware Security 23 works
• Physics and Astronomy 160 works
• Physics of Superconductivity and Magnetism 24 works
• Physiological and biochemical adaptations 83 works
• Phytase and its Applications 34 works
• Phytochemical and Pharmacological Studies 23 works
• Phytochemical compounds biological activities 25 works
• Phytochemicals and Antioxidant Activities 390 works
• Phytochemicals and Medicinal Plants 32 works
• Phytochemical Studies and Bioactivities 16 works
• Phytochemistry and Bioactive Compounds 18 works
• Phytochemistry and Bioactivity Studies 14 works
• Phytochemistry and Biological Activities 71 works
• Phytochemistry and biological activities of Ficus species 14 works
• Phytochemistry and biological activity of medicinal plants 29 works
• Phytochemistry Medicinal Plant Applications 17 works
• Phytoestrogen effects and research 161 works
• Phytoplasmas and Hemiptera pathogens 28 works
• PI3K/AKT/mTOR signaling in cancer 223 works
• Pickering emulsions and particle stabilization 18 works
• Piezoelectric Actuators and Control 35 works
• Pineapple and bromelain studies 19 works
• Piperaceae Chemical and Biological Studies 21 works
• Pituitary Gland Disorders and Treatments 318 works
• Place Attachment and Urban Studies 31 works
• Planarian Biology and Electrostimulation 47 works
• Planetary Science and Exploration 35 works
• Plant and animal studies 130 works
• Plant and Biological Electrophysiology Studies 14 works
• Plant and Fungal Interactions Research 23 works
• Plant and Fungal Species Descriptions 16 works
• Plant-based Medicinal Research 55 works
• Plant biochemistry and biosynthesis 92 works
• Plant chemical constituents analysis 12 works
• Plant-derived Lignans Synthesis and Bioactivity 16 works
• Plant Disease Management Techniques 268 works
• Plant Disease Resistance and Genetics 105 works
• Plant Diversity and Evolution 18 works
• Plant Gene Expression Analysis 100 works
• Plant Genetic and Mutation Studies 41 works
• Plant Growth Enhancement Techniques 11 works
• Plant-Microbe Interactions and Immunity 157 works
• Plant Micronutrient Interactions and Effects 50 works
• Plant Molecular Biology Research 215 works
• Plant nutrient uptake and metabolism 119 works
• Plant Parasitism and Resistance 69 works
• Plant Pathogenic Bacteria Studies 96 works
• Plant Pathogens and Fungal Diseases 197 works
• Plant Pathogens and Resistance 43 works
• Plant pathogens and resistance mechanisms 11 works
• Plant Physiology and Cultivation Studies 47 works
• Plant Reproductive Biology 86 works
• Plant responses to elevated CO2 41 works
• Plant responses to water stress 45 works
• Plant Stress Responses and Tolerance 182 works
• Plant Surface Properties and Treatments 36 works
• Plant tissue culture and regeneration 88 works
• Plant Toxicity and Pharmacological Properties 18 works
• Plant Virus Research Studies 174 works
• Plant Water Relations and Carbon Dynamics 77 works
• Plasma Applications and Diagnostics 15 works
• Plasma Diagnostics and Applications 16 works
• Plasmonic and Surface Plasmon Research 37 works
• Platelet Disorders and Treatments 300 works
• Pleistocene-Era Hominins and Archaeology 20 works
• Pleural and Pulmonary Diseases 200 works
• Pluripotent Stem Cells Research 187 works
• Pneumocystis jirovecii pneumonia detection and treatment 135 works
• Pneumonia and Respiratory Infections 305 works

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