| 1123 | Humans (MeSH) |
| 689 | Animals (MeSH) |
| 596 | Male (MeSH) |
| 586 | Female (MeSH) |
| 332 | Adult (MeSH) |
| 298 | Middle Aged (MeSH) |
| 274 | Biodegradation, Environmental (MeSH) |
| 257 | Salix (metabolism) |
| 253 | Salix (chemistry) |
| 226 | Salix (growth & development) |
| 210 | Ecosystem (MeSH) |
| 200 | Biomass (MeSH) |
| 189 | Aged (MeSH) |
| 171 | Salix (MeSH) |
| 163 | Seasons (MeSH) |
| 158 | United States (MeSH) |
| 138 | Salix (physiology) |
| 136 | Time Factors (MeSH) |
| 136 | Salix (genetics) |
| 121 | Species Specificity (MeSH) |
| 120 | Soil Pollutants (metabolism) |
| 118 | Young Adult (MeSH) |
| 116 | Plant Leaves (chemistry) |
| 109 | Phylogeny (MeSH) |
| 107 | Soil Pollutants (analysis) |
| 102 | China (MeSH) |
| 101 | Plant Leaves (metabolism) |
| 99 | Soil (MeSH) |
| 97 | Adolescent (MeSH) |
| 95 | Treatment Outcome (MeSH) |
| 93 | Temperature (MeSH) |
| 91 | Salix (microbiology) |
| 91 | Salix (drug effects) |
| 81 | Soil (chemistry) |
| 80 | Sequence Analysis, DNA (MeSH) |
| 79 | Trees (MeSH) |
| 79 | Plant Roots (metabolism) |
| 79 | Environmental Monitoring (MeSH) |
| 78 | Molecular Sequence Data (MeSH) |
| 72 | Soil Microbiology (MeSH) |
| 72 | Plant Extracts (pharmacology) |
| 70 | Reproducibility of Results (MeSH) |
| 66 | Rats (MeSH) |
| 66 | Metals, Heavy (analysis) |
| 63 | Plant Bark (chemistry) |
| 63 | Aged, 80 and over (MeSH) |
| 61 | Population Dynamics (MeSH) |
| 60 | Plant Extracts (chemistry) |
| 60 | Genetic Variation (MeSH) |
| 57 | Surveys and Questionnaires (MeSH) |
| 57 | Climate Change (MeSH) |
| 57 | Arctic Regions (MeSH) |
| 55 | Genotype (MeSH) |
| 54 | Environmental Monitoring (methods) |
| 53 | Kinetics (MeSH) |
| 52 | Plant Roots (growth & development) |
| 52 | Phytotherapy (MeSH) |
| 51 | Plants (MeSH) |
| 50 | Plant Extracts (therapeutic use) |
| 50 | Mice (MeSH) |
| 49 | Veterans (psychology) |
| 49 | Retrospective Studies (MeSH) |
| 48 | Hydrogen-Ion Concentration (MeSH) |
| 48 | Dose-Response Relationship, Drug (MeSH) |
| 47 | Trees (growth & development) |
| 47 | Plant Leaves (physiology) |
| 47 | Models, Biological (MeSH) |
| 46 | Soil Pollutants (toxicity) |
| 44 | Metals, Heavy (metabolism) |
| 44 | Conservation of Natural Resources (MeSH) |
| 44 | Chromatography, High Pressure Liquid (MeSH) |
| 43 | Risk Factors (MeSH) |
| 43 | Plant Roots (microbiology) |
| 43 | Plant Leaves (MeSH) |
| 42 | Plant Roots (chemistry) |
| 41 | Plant Leaves (growth & development) |
| 40 | United States Department of Veterans Affairs (MeSH) |
| 40 | Soil (analysis) |
| 40 | Populus (metabolism) |
| 40 | History, 19th Century (MeSH) |
| 39 | Water (MeSH) |
| 39 | Nitrogen (metabolism) |
| 39 | Biodiversity (MeSH) |
| 38 | Trees (metabolism) |
| 38 | Stress Disorders, Post-Traumatic (therapy) |
| 38 | Plants (metabolism) |
| 38 | Plant Roots (drug effects) |
| 38 | Molecular Structure (MeSH) |
| 38 | Hydroponics (MeSH) |
| 38 | Birds (physiology) |
| 37 | Soil Pollutants (pharmacokinetics) |
| 37 | History, 20th Century (MeSH) |
| 37 | Cadmium (metabolism) |
| 37 | Adaptation, Physiological (MeSH) |
| 36 | Populus (growth & development) |
| 36 | Coleoptera (physiology) |
| 36 | Anti-Inflammatory Agents, Non-Steroidal (therapeutic use) |
| 35 | Follow-Up Studies (MeSH) |
| 35 | Double-Blind Method (MeSH) |
| 35 | Climate (MeSH) |
| 34 | Wetlands (MeSH) |
| 34 | Trees (chemistry) |
| 34 | Stress Disorders, Post-Traumatic (psychology) |
| 34 | Child (MeSH) |
| 34 | Base Sequence (MeSH) |
| 34 | Air Pollutants (analysis) |
| 34 | Age Factors (MeSH) |
| 34 | Adsorption (MeSH) |
| 33 | Veterans (statistics & numerical data) |
| 33 | Severity of Illness Index (MeSH) |
| 33 | Plant Leaves (drug effects) |
| 33 | Models, Theoretical (MeSH) |
| 33 | Gas Chromatography-Mass Spectrometry (MeSH) |
| 33 | Europe (MeSH) |
| 33 | Cadmium (analysis) |
| 32 | Sweden (MeSH) |
| 32 | Rivers (MeSH) |
| 32 | Environment (MeSH) |
| 31 | Zinc (metabolism) |
| 31 | Soil Pollutants (MeSH) |
| 31 | Populus (genetics) |
| 31 | Evolution, Molecular (MeSH) |
| 31 | Analysis of Variance (MeSH) |
| 30 | Substance Abuse Detection (methods) |
| 30 | Sex Factors (MeSH) |
| 30 | Salix (anatomy & histology) |
| 30 | DNA, Fungal (genetics) |
| 29 | Salix (classification) |
| 29 | Prevalence (MeSH) |
| 29 | Pollen (MeSH) |
| 29 | Plant Roots (physiology) |
| 29 | Plant Diseases (microbiology) |
| 29 | Mining (MeSH) |
| 29 | Cross-Sectional Studies (MeSH) |
| 28 | Prospective Studies (MeSH) |
| 28 | Geography (MeSH) |
| 28 | Food Chain (MeSH) |
| 28 | Canada (MeSH) |
| 28 | Amino Acid Sequence (MeSH) |
| 27 | Water Movements (MeSH) |
| 27 | Trees (physiology) |
| 27 | Sensitivity and Specificity (MeSH) |
| 27 | Rhizosphere (MeSH) |
| 27 | Populus (physiology) |
| 27 | Plant Roots (MeSH) |
| 27 | Phenotype (MeSH) |
| 27 | Hybridization, Genetic (MeSH) |
| 27 | History, 18th Century (MeSH) |
| 27 | Herbivory (MeSH) |
| 27 | Altitude (MeSH) |
| 27 | Agriculture (MeSH) |
| 26 | Water Pollutants, Chemical (analysis) |
| 26 | United States (epidemiology) |
| 26 | United Kingdom (MeSH) |
| 26 | Randomized Controlled Trials as Topic (MeSH) |
| 26 | Plant Shoots (growth & development) |
| 26 | Nitrogen (analysis) |
| 26 | Environmental Restoration and Remediation (methods) |
| 26 | Aspirin (therapeutic use) |
| 25 | Substance-Related Disorders (therapy) |
| 25 | Plants, Medicinal (chemistry) |
| 25 | Plants, Medicinal (MeSH) |
| 25 | Light (MeSH) |
| 25 | Glucosides (MeSH) |
| 25 | Forests (MeSH) |
| 25 | Diet (MeSH) |
| 25 | Child, Preschool (MeSH) |
| 25 | California (MeSH) |
| 24 | Wood (MeSH) |
| 24 | Populus (chemistry) |
| 24 | Chromatography, Liquid (MeSH) |
| 24 | Biological Evolution (MeSH) |
| 24 | Aspirin (history) |
| 23 | Salix (parasitology) |
| 23 | Larva (physiology) |
| 23 | Internet (MeSH) |
| 22 | Tandem Mass Spectrometry (MeSH) |
| 22 | Plants (chemistry) |
| 22 | Plant Proteins (metabolism) |
| 22 | Plant Extracts (administration & dosage) |
| 22 | Plant Development (MeSH) |
| 22 | Photosynthesis (physiology) |
| 22 | Norway (MeSH) |
| 22 | Mass Spectrometry (MeSH) |
| 22 | Genes, Plant (MeSH) |
| 22 | Gene Expression Regulation, Plant (MeSH) |
| 22 | Comorbidity (MeSH) |
| 22 | Algorithms (MeSH) |
| 21 | Zinc (analysis) |
| 21 | Water Purification (methods) |
| 21 | Water Pollutants, Chemical (metabolism) |
| 21 | Water (chemistry) |
| 21 | Regression Analysis (MeSH) |
| 21 | Populus (MeSH) |
| 21 | Polymerase Chain Reaction (MeSH) |
| 21 | Plant Extracts (analysis) |
| 21 | Plant Bark (MeSH) |
| 21 | History, Ancient (MeSH) |
| 21 | Genetic Markers (MeSH) |
| 21 | Ecology (MeSH) |
| 21 | Desert Climate (MeSH) |
| 21 | DNA, Ribosomal Spacer (genetics) |
| 21 | Cost-Benefit Analysis (MeSH) |
| 21 | Cells, Cultured (MeSH) |
| 21 | Biofuels (MeSH) |
| 20 | Social Support (MeSH) |
| 20 | Risk Assessment (MeSH) |
| 20 | Quality of Life (MeSH) |
| 20 | Poland (MeSH) |
| 20 | Plant Shoots (metabolism) |
| 20 | Phenols (analysis) |
| 20 | Lignin (chemistry) |
| 20 | Lead (metabolism) |
| 20 | Lead (analysis) |
| 20 | Genome, Plant (MeSH) |
| 20 | Genetics, Population (MeSH) |
| 20 | Feeding Behavior (MeSH) |
| 20 | DNA, Ribosomal (genetics) |
| 20 | Copper (analysis) |
| 20 | Cohort Studies (MeSH) |
| 20 | Charcoal (chemistry) |
| 20 | Cattle (MeSH) |
| 19 | Waste Disposal, Fluid (methods) |
| 19 | Substance-Related Disorders (psychology) |
| 19 | Soil Pollutants (isolation & purification) |
| 19 | Sequence Alignment (MeSH) |
| 19 | Reproduction (MeSH) |
| 19 | RNA, Ribosomal, 16S (genetics) |
| 19 | Plant Stems (chemistry) |
| 19 | Plant Proteins (genetics) |
| 19 | Photosynthesis (MeSH) |
| 19 | Metals, Heavy (pharmacokinetics) |
| 19 | Longitudinal Studies (MeSH) |
| 19 | Hydrolysis (MeSH) |
| 19 | Fertilizers (MeSH) |
| 19 | Chlorophyll (metabolism) |
| 19 | Bacteria (genetics) |
| 19 | Bacteria (classification) |
| 19 | Alcoholism (epidemiology) |
| 19 | Adaptation, Psychological (MeSH) |
| 18 | Wood (chemistry) |
| 18 | United States Department of Veterans Affairs (statistics & numerical data) |
| 18 | Socioeconomic Factors (MeSH) |
| 18 | Refuse Disposal (MeSH) |
| 18 | Predatory Behavior (MeSH) |
| 18 | Plant Stems (metabolism) |
| 18 | Plant Preparations (therapeutic use) |
| 18 | Oxidative Stress (drug effects) |
| 18 | Microbial Sensitivity Tests (MeSH) |
| 18 | Limit of Detection (MeSH) |
| 18 | Larva (growth & development) |
| 18 | Japan (MeSH) |
| 18 | Glucosides (chemistry) |
| 18 | Geologic Sediments (chemistry) |
| 18 | Gene Expression Profiling (MeSH) |
| 18 | Disease Models, Animal (MeSH) |
| 18 | DNA, Plant (genetics) |
| 18 | Copper (metabolism) |
| 18 | Birds (MeSH) |
| 18 | Anti-Inflammatory Agents (pharmacology) |
| 18 | Alleles (MeSH) |
| 17 | Water (metabolism) |
| 17 | Veterans (MeSH) |
| 17 | Trace Elements (analysis) |
| 17 | Tissue Distribution (MeSH) |
| 17 | Substance-Related Disorders (rehabilitation) |
| 17 | Substance-Related Disorders (epidemiology) |
| 17 | Snow (MeSH) |
| 17 | Seedlings (growth & development) |
| 17 | Reference Standards (MeSH) |
| 17 | Rain (MeSH) |
| 17 | Practice Guidelines as Topic (MeSH) |
| 17 | Poaceae (MeSH) |
| 17 | Plant Transpiration (drug effects) |
| 17 | Plant Transpiration (MeSH) |
| 17 | Magnetic Resonance Spectroscopy (MeSH) |
| 17 | Lignin (metabolism) |
| 17 | Home Care Services (MeSH) |
| 17 | Fungi (classification) |
| 17 | Crops, Agricultural (MeSH) |
| 17 | Coleoptera (genetics) |
| 17 | Cluster Analysis (MeSH) |
| 17 | Carbon (metabolism) |
| 17 | Carbon (analysis) |
| 17 | Calibration (MeSH) |
| 17 | Biological Availability (MeSH) |
| 17 | Benzyl Alcohols (chemistry) |
| 17 | Antioxidants (pharmacology) |
| 17 | Alcoholism (rehabilitation) |
| 16 | Tundra (MeSH) |
| 16 | Trees (genetics) |
| 16 | Substance-Related Disorders (diagnosis) |
| 16 | Soil Pollutants (chemistry) |
| 16 | Population Density (MeSH) |
| 16 | Pain (drug therapy) |
| 16 | Oxidation-Reduction (MeSH) |
| 16 | North America (MeSH) |
| 16 | Hot Temperature (MeSH) |
| 16 | Environmental Pollution (MeSH) |
| 16 | DNA, Bacterial (genetics) |
| 16 | Computer Simulation (MeSH) |
| 16 | Cold Temperature (MeSH) |
| 16 | Cities (MeSH) |
| 16 | Chromosome Mapping (MeSH) |
| 16 | Biological Transport (MeSH) |
| 16 | Basidiomycota (genetics) |
| 16 | Analgesics (therapeutic use) |
| 16 | Alaska (MeSH) |
| 16 | Administration, Oral (MeSH) |
| 15 | Trees (microbiology) |
| 15 | Plants (microbiology) |
| 15 | Plant Leaves (anatomy & histology) |
| 15 | Pilot Projects (MeSH) |
| 15 | Phenols (chemistry) |
| 15 | Motivation (MeSH) |
| 15 | Microscopy, Electron, Scanning (MeSH) |
| 15 | Microsatellite Repeats (MeSH) |
| 15 | Linear Models (MeSH) |
| 15 | Italy (MeSH) |
| 15 | Host-Parasite Interactions (MeSH) |
| 15 | Fungi (genetics) |
| 15 | Flavonoids (pharmacology) |
| 15 | Environmental Pollutants (analysis) |
| 15 | Droughts (MeSH) |
| 15 | Demography (MeSH) |
| 15 | Chromatography, High Pressure Liquid (methods) |
| 15 | Cell Line, Tumor (MeSH) |
| 15 | Cats (MeSH) |
| 15 | Ascomycota (genetics) |
| 15 | Anti-Inflammatory Agents, Non-Steroidal (adverse effects) |
| 15 | Alcoholism (psychology) |
| 14 | Trees (classification) |
| 14 | Skin Tests (MeSH) |
| 14 | Russia (MeSH) |
| 14 | Research Design (MeSH) |
| 14 | Qualitative Research (MeSH) |
| 14 | Program Evaluation (MeSH) |
| 14 | Plant Transpiration (physiology) |
| 14 | Organ Size (MeSH) |
| 14 | Models, Genetic (MeSH) |
| 14 | Low Back Pain (drug therapy) |
| 14 | Language (MeSH) |
| 14 | Home Care Services (organization & administration) |
| 14 | Glucosides (pharmacology) |
| 14 | Glucosides (isolation & purification) |
| 14 | Germany (MeSH) |
| 14 | Forestry (MeSH) |
| 14 | Forensic Toxicology (MeSH) |
| 14 | Finland (MeSH) |
| 14 | England (MeSH) |
| 14 | DNA, Fungal (chemistry) |
| 14 | DNA Barcoding, Taxonomic (MeSH) |
| 14 | Conservation of Natural Resources (methods) |
| 14 | Clinical Trials as Topic (MeSH) |
| 14 | Chromatography, Gas (MeSH) |
| 14 | Carbon (chemistry) |
| 14 | Basidiomycota (classification) |
| 14 | Ascomycota (classification) |
| 14 | Anti-Inflammatory Agents, Non-Steroidal (history) |
| 14 | Analgesics, Opioid (therapeutic use) |
| 13 | Volatile Organic Compounds (analysis) |
| 13 | Superoxide Dismutase (metabolism) |
| 13 | Stress, Physiological (MeSH) |
| 13 | Songbirds (physiology) |
| 13 | Sewage (MeSH) |
| 13 | Reproduction (physiology) |
| 13 | Reference Values (MeSH) |
| 13 | Rats, Wistar (MeSH) |
| 13 | Polymorphism, Restriction Fragment Length (MeSH) |
| 13 | Polymorphism, Genetic (MeSH) |
| 13 | Patient Education as Topic (MeSH) |
| 13 | Osteoarthritis (drug therapy) |
| 13 | Mycorrhizae (genetics) |
| 13 | Mycorrhizae (classification) |
| 13 | Luteinizing Hormone (blood) |
| 13 | In Vitro Techniques (MeSH) |
| 13 | Greenhouse Effect (MeSH) |
| 13 | Geologic Sediments (analysis) |
| 13 | Forensic Toxicology (methods) |
| 13 | Fluorescent Dyes (chemistry) |
| 13 | Diagnosis, Differential (MeSH) |
| 13 | Crosses, Genetic (MeSH) |
| 13 | Communication (MeSH) |
| 13 | Cold Climate (MeSH) |
| 13 | Chronic Disease (MeSH) |
| 13 | Cell Survival (drug effects) |
| 13 | Cell Line (MeSH) |
| 13 | Betula (growth & development) |
| 13 | Benzyl Alcohols (therapeutic use) |
| 13 | Benzyl Alcohols (pharmacology) |
| 13 | Belgium (MeSH) |
| 13 | Arizona (MeSH) |
| 12 | Volatilization (MeSH) |
| 12 | Visual Cortex (physiology) |
| 12 | Trees (parasitology) |
| 12 | Symbiosis (MeSH) |
| 12 | Structure-Activity Relationship (MeSH) |
| 12 | Stress Disorders, Post-Traumatic (complications) |
| 12 | Quality of Health Care (MeSH) |
| 12 | Populus (microbiology) |
| 12 | Polycyclic Aromatic Hydrocarbons (analysis) |
| 12 | Pollen (immunology) |
| 12 | Plants (classification) |
| 12 | Plant Stems (growth & development) |
| 12 | Plant Extracts (adverse effects) |
| 12 | Phosphorus (analysis) |
| 12 | Phenols (pharmacology) |
| 12 | Phenols (metabolism) |
| 12 | Patient Satisfaction (MeSH) |
| 12 | Nitrogen (MeSH) |
| 12 | Mycorrhizae (growth & development) |
| 12 | Metals, Heavy (isolation & purification) |
| 12 | Metals, Heavy (chemistry) |
| 12 | Infant (MeSH) |
| 12 | Industrial Waste (MeSH) |
| 12 | Hymenoptera (physiology) |
| 12 | Hydrocarbons (metabolism) |
| 12 | Health Care Costs (MeSH) |
| 12 | Glycosides (chemistry) |
| 12 | Fungi (physiology) |
| 12 | Fungi (isolation & purification) |
| 12 | Flow Cytometry (MeSH) |
| 12 | Flavonoids (chemistry) |
| 12 | Feeding Behavior (physiology) |
| 12 | Dogs (MeSH) |
| 12 | Coleoptera (MeSH) |
| 12 | Brain (metabolism) |
| 12 | Bees (physiology) |
| 12 | Bayes Theorem (MeSH) |
| 12 | Bacteria (metabolism) |
| 12 | Arsenic (analysis) |
| 12 | Antioxidants (chemistry) |
| 12 | Anti-Inflammatory Agents, Non-Steroidal (administration & dosage) |
| 12 | Analgesics, Opioid (adverse effects) |
| 12 | Allergens (immunology) |
| 12 | Allergens (analysis) |
| 11 | Zinc (MeSH) |
| 11 | Water Pollutants, Chemical (toxicity) |
| 11 | Water Pollutants, Chemical (chemistry) |
| 11 | United States Department of Veterans Affairs (organization & administration) |
| 11 | Turkey (MeSH) |
| 11 | Trace Elements (metabolism) |
| 11 | Stress Disorders, Post-Traumatic (epidemiology) |
| 11 | Sequence Homology, Amino Acid (MeSH) |
| 11 | Self Report (MeSH) |
| 11 | Remission Induction (MeSH) |
| 11 | Refuse Disposal (methods) |
| 11 | Reactive Oxygen Species (metabolism) |
| 11 | Psychiatric Status Rating Scales (MeSH) |
| 11 | Predictive Value of Tests (MeSH) |
| 11 | Plants, Edible (MeSH) |
| 11 | Plants (genetics) |
| 11 | Plant Stems (MeSH) |
| 11 | Plant Roots (genetics) |
| 11 | Plant Leaves (microbiology) |
| 11 | Plant Leaves (genetics) |
| 11 | Plant Extracts (isolation & purification) |
| 11 | Phytotherapy (methods) |
| 11 | Phosphorus (metabolism) |
| 11 | Periodicity (MeSH) |
| 11 | Pain Measurement (MeSH) |
| 11 | Oviposition (MeSH) |
| 11 | Mycorrhizae (isolation & purification) |
| 11 | Metals (analysis) |
| 11 | Interpersonal Relations (MeSH) |
| 11 | Indicators and Reagents (MeSH) |
| 11 | History, 21st Century (MeSH) |
| 11 | Glycosides (analysis) |
| 11 | Fresh Water (MeSH) |
| 11 | Fluorescence (MeSH) |
| 11 | Floods (MeSH) |
| 11 | Feasibility Studies (MeSH) |
| 11 | Diarrhea (drug therapy) |
| 11 | Deer (physiology) |
| 11 | DNA, Ribosomal Spacer (chemistry) |
| 11 | Cloning, Molecular (MeSH) |
| 11 | Chromatography, Thin Layer (MeSH) |
| 11 | Case-Control Studies (MeSH) |
| 11 | Breeding (MeSH) |
| 11 | Body Weight (MeSH) |
| 11 | Behavior, Animal (MeSH) |
| 11 | Bacteria (growth & development) |
| 11 | Apoptosis (drug effects) |
| 11 | Antioxidants (metabolism) |
| 11 | Animal Distribution (MeSH) |
| 11 | Alcohol Drinking (psychology) |
| 10 | Wind (MeSH) |
| 10 | Water Supply (MeSH) |
| 10 | Water Pollutants, Chemical (isolation & purification) |
| 10 | Water (physiology) |
| 10 | Water (analysis) |
| 10 | Ultraviolet Rays (MeSH) |
| 10 | Transcriptome (MeSH) |
| 10 | Tomography, X-Ray Computed (MeSH) |
| 10 | Swine (MeSH) |
| 10 | Svalbard (MeSH) |
| 10 | Survival Analysis (MeSH) |
| 10 | Stress Disorders, Post-Traumatic (diagnosis) |
| 10 | Steam (MeSH) |
| 10 | Spain (MeSH) |
