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785

Acta Cryst. (1992). A48, 785-790

International Union of Keywords for the Database of Crystallographers and the World Directory Y. Epelboin, General Editor, LMCP, Universit~s P. M. Curie et Paris VII, URA 009, CNRS, Case 115, 75252 Paris CEDEX 05, France [e-mail: [email protected]]

The International Union of Crystallography will set up a world Scientists will be able to use their own keywords for a bet- database of crystallographers. The next issue of the Worm Di- ter definition of their fields of interest but electronic searching rectory will be a by-product of this database. of the database will be based on this printed list. The aim is to allow any scientist to retrieve useful informa- The collection of data will start at the beginning of 1993 tion on other scientists: addresses, interests .... The database and instructions will be distributed by the national Sub-Editors. will be accessed by e-mail and later via telnet sessions. Secu- rity will be enforced to ensure that the data are not used for The list is divided into three parts: - Methods, Properties non-scientific purposes. and Applications - Compounds - Attributes. The Attributes list must be used in conjunction with the other two lists and defines One of the main uses is to find specialists on given topics. additional keywords for a better description of entries in those This means that it will be possible to search the database by lists. keywords and these must be defined in advance. The present list has been established on the basis of the keywords used I hope that everybody will find appropriate definitions in in the eighth edition of the Worm Directory. Some additional the present lists. For maximum efficiency of the search process keywords corresponding to new fields have been added. Some, it is necessary to bear in mind that a too strict definition will too specific or misspelled, have been suppressed. Altogether be useless. This is one of the key points for the success of this there are about 1500 keywords. database.

Methods, Properties and Applications This list contains the keywords for methods of study, properties (physical, chemical, biological.... ) and applications. It may be used with words defined in the Attributes list.

Aberration Antiphases Biomaterial Chelation Computer sciences Absolute configuration Anvil cell Biomechanics Chemisorption Computer technology Absolute structure Aperiodic material Biomolecule Computing Absorption correction Apparatus Biophysics Chemometrics Condensed matter Absorption edge Archeology Chemotaxis Conductivity Absorption Archeometallurgy Birefringence Chemotherapy Conductor Accuracy Archeometry Bloch structure Chirality Conformation Accurate intensity Area detector Bloch wall Conformational change Acoustics Art conservation Bond length Circular dichroism Contaminant clean-up Acoustooptics Arthropatic disease Bond method Classification Contractile system Activity Artificial intelligence Bond order Clinker Contrast Adhesion ARUPS Bonding Close packing Control Adrenergics ASAXS Born approximation Cloud physics Convective heat Adsorbate Association theory Borrmann absorption Clustering Convergent-beam diffraction Adsorption Astronomy Boundaries Coagulation Cooperative interaction AEM Astrophysics Bragg intensity Coalification Cooperative phenomena Aerodynamics Asymmetric synthesis Bravais lattice Coarsening Coordination Aerosol Asymmetry Bridgman Stockbarger Coating Corrosion Aerospace Athletic medicine technique Codification AES Atomic weight Brillouin spectroscopy Cohesion Crack Affinity Attenuation coefficient Burial diagenesis Cohesive energy Cracking Ageing process Auger spectroscopy Calcification Colour center Creep Agriculture Automation Calibration Colour symmetry Critical phenomena Algorithm Autometasomatism Combinatorial theory Cross section ALISUVAX Back-reflection Camera Combustion Cryogenics Allostery Ballistic Carboxylation Complexation Crystal field Alteration Band calculation Carcinogenesis Compliance sampling Crystal force Amorphization Basicity relationship Compression Crystal form Amorphous phase Battery Centrosymmetry Compton scattering Crystal growth Analgesics Bijvoet absorption edge Chandler wobble Computer Crystallinity Anharmonicity Channelling Computer-aided education Crystallite Anisotropy Biocoordination Characterization Computer architecture Crystallization Annealing Biocrystallography Charge Computer-assisted design Crystallogeny Anomalous dispersion Bioelectret Charge-density wave Computer automation Crystallography Anomeric effect Bioenergetics Charge localization Computer graphics CVD Antiferroelectricity Biology Charge transfer Computer management Cycloaddition Computer modelling Czochralski technique 786 INTERNATIONAL UNION OF CRYSTALLOGRAPHY

Damage Electroluminescence Force field Holography Lattice energy Data collection Electromechanics Form Homology Lattice parameter Data processing beam Formability Homophase Lattice stability Database Electron microscope Form factor Hydration Lattice vibration Debye Scherrer tomography Four-dimensional Hydrodynamics Laue diffraction Debye temperature Electron microscopy crystallography Hydroelectrodynamics Laue group Deby Waller factor Electron probe micro- Fourier transform Hydrogen bonding Law Decay analysis Fractal Hydrolysis Layer Decomposition Electronics Fracture Hydrotreating LCAO method Deconvolution Electronic spect_qun Framework structure Ideal structure Least-squares refinement Decoration Electron spin resonance Free energy Identification LEED Defect Electrooptics FFIR Image processing Light Deformation Electrophotography Fuel cell Image reconstruction Light scattering Densitometry Electroporation Function Imaging Limnology Density distribution Electrostatic potential Funding Immune regulation LIMS Depolarization Electrostatics Furnace Immunoassay Linear algebra Deposition Embrittlement Gamma ray Immunobiology Linear dichroism Derivative structure Endocrinology Gap junction Immunochemistry Line broadening Design Energetics Gasification Immunodeficiency Line profile Desmearing Energy Gemology Immunology Line profile analysis Detector Energy band Genesis Imperfection Liquid state Devitrification Energy conversion Implantation Lithogeochemistry Diagnostic Energy-dispersive analysis Geochronology Impurity Lithography Dielectrics Energy loss Geodynamics Inclusion Local order Differential thermal analysis Energy transduction Geology Incoherent scattering Logics Diffraction Engineering Geomagnetism Incommensurate Low energy Diffraction data Entropy Geometry Indexing Low-energy electron Diffraction technique Environment Geometry analysis Industry diffraction Diffraction theory Environmental cracking Geomorphology Inelastic scattering Low pressure Diffractometer Environment protection Geophysics Information science Low temperature Diffractometry Epitaxy Geosciences Information storage Luminescence Diffuse scattering EPR Geotechnics Information system Madelung factor Diffusion ESCA Germination Infrared Magnetic domain Digital signal processing Etching Gerontology Infrared detector Magnetic recording Diode EXAFS GIXS Inhibition Magnetic resonance Direct method Exciton Glaciology Inhibitor Dirichlet domain Expert system Goniometry Instability Discrete mathematics Exsolution Graphics Instrumentation density Dislocation Extinction Graph theory Integrated circuit Magnetochemistry Disorder Extraction Grazing incidence Integrated optics Magnon Dispersion Extremal condition Group theory Intensity Management Dispersive system Failure analysis Growth Interaction Massively parallel com- Displacive modulation Fankuchen effect Hall effect Interatomic distance puting Dissolution Fast Hardening Intercalation Mathematics Distribution functions Fatigue Hardness Interface Maturation Divergent-beam method Fault Heat transfer Interference Maximum-entropy method Documentation Fermion Heavy Interferometry MBE Domain structure Ferroelasticity Heavy fermion Intermediate phase MCZ Dosimetry Ferroelectricity Heterophase Internal friction Measurement Doublet separation Field calculation Heterostructure International Tables for Mechanics Drug Field displacement High energy Crystallography Mechanism DSC Field microscopy High-energy electron Inverse problem Medicine DTA Field ionization diffraction Ion beam Melting Dynamical diffraction Field theory High-energy electron Ion exchanger Metabolism Dynamical property Film microscopy Ionic conductivity Metallogenesis Dynamics Filter High field Ion implantation Metailography Economy FIR High-precision diffractom- Irradiation Edaphology Fission product etry Isomorphism Metamorphism EDAX Fitting High-precision structures Isomorphous replacement Methodology EDS Fixation High pressure Jahn Teller effect Methylation Education Flash X-ray diffraction High purity Kikuchi effect Metrology EDX Float zone growth High-resolution diffractom- Kinetics Microanalysis EELS Flotation Microbeam analysis etry Kohn anomaly EF hand Fluorescence High-resolution electron mi- Kossel diffraction Microcomputer Elasticity Flux croscopy Microcroscopy Focused ion beam High temperature Langmuir Blodgett film Microcrystal Electrocrystallization Folding High voltage Langmuir monolayer Microcrystallography Electrodeposition Forbidden reflection Histocompatibility Laser Microdiffraction Electrofusion Force History Lattice distortion Microelectronics Electrolysis Force constant Hole centre Lattice dynamics Microfilming INTERNATIONAL UNION OF CRYSTALLOGRAPHY 787

Microgravity OD Physiology Recombination Software Microlithography Oncology Pi electron Reconstruction Soft X-ray Micromagnetism One dimension Piezoelectricity Recrystallization Solar cell Micrometre scale Ontogeny Pigment Refinement method Solar collector Micromethod Optical activity Pitch Reflectance Solar energy Micromorphology Optical property Planar defect Reflected light microscopy Solidification Microprocessor Optical transform Planetology Refiectivity Solid phase Microscopy Optics Planning Refractive index Solid solution Microstrain Optimization Plasmon Regulation Solid state Microstructure Optoelectrical property Plastic flow Relaxation Solubility Microtexture Optoelectronics Plasticity Reliability Solution Microtomography Orbital calculation Plastics REM Sorption Microwave Order Platelet Remote control Sound propagation Mineralization Order-disorder Point defect Repair Space Mineralogy Ordered structure Point group Replacement Space group Minimization Ordering Poisoning Replication Space processing Mining Orientation Polarity Representation theory Specific heat Mirrors Orogenic belt Polarization Research Spectrography Miscibility Oscillation camera Polarization microscopy Residual electron density Spectrometry Misorientation Ostwald ripening Polarized neutron Residual stress Spectrophotometry Mobility Overcrowding Pole figure Resistivity Spectroscopy MO calculation Oxidation Pollution Resonance Spectrum analysis Modelling Packing Polycrystal Resonance spectrometry Spin Modulated structures Paleomagnetism Polymerization Resonant scattering Spin density Moire Paracrystal Polymorphism Restrained least squares Spinel Molecular beam Paragenesis Polytypism Reversible reaction Spin resonance Molecular crystal Paramagnetic resonance Porosity RHEED Spin wave Molecular mechanics Paramaguetics Positron annihilation Rietveld method Sport Molecular rectifier Parameter Potential energy Rigid-body analysis Sputtering Molecular replacement Patent Powder Risk assessment Stability Molecular vibration Pattern recognition Precession Rocking curves Stacking Momentum density Patterson method Precipitation Rotatory dispersion Stacking fault Momentum distribution Perfect crystal Precise measurement Safety Standing wave Monitoring Perfection Prediction Satellite reflection Statistical mechanics Monochromator Performance Preparation SAXS Statistical method Monocrystal Pericyclic reaction Pressure Scale factor Statistical model Monolayer Permittivity Processing Scale mechanism Statistical thermodynamics Monte Carlo Petrography Profile analysis Scanning electron Statistics Morphology Petrology Proportional counter microscopy Stepanov method MOS Prosthesis Scanning tunnel microscopy Mosaicity Phase determination Pseudomorphism Scattering Stereoselectivity Mossbauer Phase diagram Pseudosymmetry Scattering factor Stoichiometry Motion Phase equilibrium Publishing Sciences Strain Multibeam Phase formation Pulsed neutron Search and match Strain deformation Multicrystal Phase kinetics Purification Secondary bonding Strain determination Multidomain Phase refinement PVD Secondary electron emission Strain hardening Multilayer Phase separation Pyroelectricity Sedimentation Streaks Multiphase Phase transition QSAR Seismology Strength Multiple-crystal diffractom- Philosophy Quadrupole resonance Selectivity Stress etry Philosophy of science Qualitative analysis Semiconductor Structural change Multiple scattering Phonon resonance Semi-empirical calculation Structural disorder Multislice method Phonon softening Quasicrystal Sensor Structure Mutagenesis Radiation Sequencing Structure determination Structure factor Mycology Photochromism Radiation protection Service Structure-activity Nanoanalysis Photoconductivity Radioactivity Shape relationship Photodimerization Shape memory Subconductor Non-destructive analysis Photoelasticity Radiotracer Shock metamorphism Sublimation Non equilibrium Photoelectron Raman Shock wave Substitution Non-linear property Photoemission Random phasing method Short hydrogen bond Substructure Nonstoichiometry Photogeology Random system Short-range order Supercomputer NPR Photography Random walk SIMS Superconductivity NQR Photon effect Rayleigh scattering Simulation Nuclear filter Photoreaction centre Reactivity Simultaneous diffraction Superconductor Superfiuid Nuclear fusion Photorearrangement Real crystal Single crystal Superlattice Nuclear magnetic resonance Photorefraction Real structure Sintering Supermagnetism Nuclear reactor Photostimulated process Real-time control Size distribution Superstructure Nucleation Photosynthesis Real-time imaging Size effect Surface Number theory Phylogeny Rearrangement Slow neutron Survey Nutrition Physical property Receptor Small-angle scattering Symbolism Occupancy Physics Recognition Soft mode 788 INTERNATIONAL UNION OF CRYSTALLOGRAPHY

Symmetry Texture Topochemistry Twinning Wavelength Symmetry breaking TGA Topography Typomorphism WAXS Symmetry group Theory Topology Ultra high pressure WDS Synchrotron radiation Thermal expansion Topotacticity Ultra high vacuum Wok-beam electron Syncrystallization Thermal motion Topotaxy Ultra pure compound diffraction Synthesis Thermal property Toxicity Ultrasonics Weak interaction Systematics Thermal stress Toxicology Ultraviolet Weathering System dynamics Thermal vibration Trace Unit cell Welding System integration Thermistor Trace analysis Unusual bonding Whisker Tautomerism Thermoanalysis Track detector UPS White-beam radiation Technique Thermodynamics Transcription Wide-angle scattering Technology Thermogravimetry Transducer Vacancy Wigner crystal Television Thermoluminescence Transduction Vacuum Temperature Thermostability Transformation Valence charge density XANES Tensor Thick film Transmission electron van der Waals radius XPS Tensometry Thin film microscopy Vector search X-ray fluorescence Tensor property Thin layer Tribology Vibration X-ray fluorescence Termination effect Three-dimensional Triplet Vitreous state spectroscopy Tertiary structure reconstruction Tube Volatility Yeast expression system Testing Time-resolved effect Tunnelling Volcanology Ylides " Time-of-flight diffraction Twin VVPES

Compounds This list contains classes of compounds and more general names to define classes of materials, such as . It may be used with words defined in the Attributes list.

Acetylene Antigens Basaltic rock Catalysts Dichalcogenides Acids Antihistaminic compounds Bases Celluloses Dielectrics Actin Antihypertensive com- Bauxite Cements Dihydrofolate pounds Beryl Ceramics Dipeptide Adenoviruses Anti-inflammatory com- Beryllium compounds Chalcogenides Disease Adrenergic compounds pounds Bile pigments Chalcogens Dismutases Aggregates Anti-inflluenza compounds Bimetallic compounds Chalcopyrites Diterpenes AIDS Antileprosy compounds Binary alloys Chelates Diuretics Air Antileukemia compounds Bioceramics Chlorine compounds DNA Albumin Antimalarial compounds Biopolymers Chlorites Drug Alkaline Antimicrobial compounds Bismuth compounds Chromatin Dust Alkalis Antimitotic compounds Blende Chromite Dyes Alkaloids Antimony compounds Blood Chromium compounds Elastomers Antimuscarinic compounds Boehmite Chrysotile Electroceramics Alkoxides Antioxidants Bone Clathrates Electrolytes Allergenics Antiparasitic compounds Boron compounds Clays Energetic compounds Alloys Anti-Parkinsonian com- Borophosphates Clusters Enkephalins Alumina pounds Borosilicates Coal Enzyme inhibitors Aluminate Antipsychotic compounds Bromium compounds Cobalt compounds Enzymes Aluminium compounds Antipyretics Bronzes Coke Estrogens Aluminosilicates Antirheumatic compounds Buffers Colloids Expectorants Amino acids Antischistosomal com- Bushveld complex Conglomerates Explosives Analgesics pounds Cadmium compounds Copper compounds Anorthosite Antischizophrenia com- Cage Cordierite Fab fragments Antiallergenics pounds Calcium compounds Crown compounds Fats Antiamoebic compounds Antisickling compounds Cancer Crust Feldspars Antiangional compounds Antispasmodics Carbanions Cryptates Ferrites Antiarrhythmic compounds Antithrombotic compounds Carbides Cubanes Fertilizers Antiarthritic compounds Antitumour compounds Carbohydrates Cyanide Fibres Antiasthmatic compounds Antiulcet compounds Carbonates Cyanins Fire-resistant compounds Antibacterial compounds Antiviral compounds Carbonyls Cyclic polyethers Flavonoids Antibiotics Anxiolitic compounds Carbon compounds Cyclodextrins Fluids Antitaodies Apatite Carboranes Cyclophosphazenes Fluoride Anticancer compounds Archeological materials Carboxylates Cytochrome Fluorine compounds Anticholinergic compounds Arsenic compounds Carboxylic acids Cytoplasm Fluorometallates Anticoagulants Asbestos Carboxypeptidases Cytotoxins Fluoroorganics Fossils Anticonvulsants Austenite Carcinogens Dehydrogenases Free radicals Antidepressants Bacterial compounds Carcinostats Dental material Fuel Antiemetics Bacterial toxin Cardenolides Detergents Fulgides Antiestrogen compounds Barbiturates Cardiac compounds Diamond Fungicides Antifolates Barium compounds Cascade proteins Diaspores Antigelling compounds Fused tings INTERNATIONAL UNION OF CRYSTALLOGRAPHY 789

Attributes This list contains additional keywords which may be used together with those defined in the Compounds and Methods, Properties and Applications lists.

Absolute Commensurate Formation Mass Qualitative Absorbing Comparison Four-dimensional Material Quantitative Accurate Complex Gamma-ray Mathematical Quantum Acid Composite Genetic Mechanical Quasielastic Acoustic Composition Geochemical Medical Quaternary Activation Compound Geometric Medicinal Rapid Active site Condensed Geothermal Medium-size Reaction Active surface Conducting Globular Mesogenic Refinement Acyclic Conformational Glycolytic Metallic Reflection Adduct Constituent Metalloorganic Relationship Agrochemical Cosmic Halophilic Metallurgical Relative Amorphous Crystal Heavy Metamorphic Residue Amphibole Crystalline Helical Metastable Resolution Amphiphilic Cubic Heterocyclic Method Respiratory Analysis Cyclic Heterogeneous Mineralized Restrained Hexagonal Mixed Rhombohedral Analytical Density High Model Ring Anharmonic Dependence High-precision Modulated Rolled Anhydrous Deposit Holographic Molecular Anion Dielectric Homogeneous Monochromatic Secondary Anisotropic Difference Hydrothermal Monoclinic Separation Anomalous Diffuse Hydrous Monoclonal Sequence Anorthic Disordered Hygroscopic Mosaic Short-period Antiferroelastic Displacive Site Antiferroelectric Domain Icosahedral Multiple Size Anti ferromagnetic Donor Ideal Non-ideal Slag Application Doped Incoherent Nematic Small Applied Double Inelastic Neurological Small-angle Aqueous Drug Infrared Neutron Smectic Asymmetric Dynamic Inorganic Non- Solid Asymptotic Dynamical Interaction Non-bonded Soluble Atmospheric Interatomic Non-crystalline Spectral Atom Efflorescent Intercrystalline Non-crystallographic Stainless Atomic Elastic Interfacial Non-linear Static Electrical Intermetallic Nuclear-one-dimensional Stereographic Behaviour Electromagnetic Intermolecular Binary Electron Internal Optical Strained Binding Electronic Interstitial Organic Structural Bioactive Electrooptic Intracrystalline Organometallic Substituent Biochemical Electrostatic Intramolecular Orthorhombic Superionic Biogenic Elongation Intrazeolitic Pathological Synthetic Bioinorganic Emission Inverse Perfect Tensile Biological Energy Ion Pharmaceutical Ternary Biomedical Energy-dispersive Ionic Phase Tetragonal Bioorganic Environmental Irradiated Phonon Theoretical Bond Enzymatic Isometric Phosphoorganic Thermal Boundary Epitaxic Photochromic Thermophile Bragg Equilibrium Laminated Bridged Evolution Large-angle Photon Toxic Building Exchange Laue Photovoltaic Transfer Bulk Excitation Layered Physical Transport Catalytic Experimental Light Piezoelectric Treatment Cation Exploration Linear Plastic Two-dimensional Chain Extended Liquid Polar Unidirectional Local Polychromatic Unsaturated Channel Ferroelastic Long-period Polycyclic Charge Ferroelectric Low Polymeric Vacancy Chemical Ferroic Low-dimensional Polymorphic Vibrating Chiral Ferromagnetic Polytypic Viral Chiroptical Fibrillous Macrocyclic Porous Volatile Chromatic Fibrous Macromolecular Process Volcanic Clinical Five-dimensional Magmatic Property Wet Close-packed Focusing Magnetic Pulsed X-ray Coherent Forensic Marine Pyrroelectric Colour Martensitic Zone 790 INTERNATIONAL UNION OF CRYSTALLOGRAPHY

Gallium compounds Jahn Teller compounds Neuroleptics Polymerases Solvents Gallstones Lamellar compounds Neuropeptides Polymers Steels Gases Lamprophyres Neurotoxins Polyolefms Steroids Gelatins Lamp materials Nickel compounds Polyoxoanions Sterols Gels Niobium compounds Polypeptides Strontium compounds Gemstones Layered compounds Nitrates Polyphosphides Sulfates Genes Lead compounds Nitrides Polyproteins Sulfides Germanates Ligands Nitrogenases Polysaccharides Sulfur compounds Germanium compounds Lipases Nitrogen compounds Polythionates Superalloys Glasses Lipids Noble gases Porous materials Superconductors Glycogens Lipoproteins Noble metals Porphyrins Superoxides Glycoproteins Liquid crystals Nuclear materials Potassium compounds Surfactants Glycosaminoglycans Liquids Nucleic acids Powders Sweeteners Glycosides Lithium compounds Nucleoproteins Precipitates Tantalum compounds Gold compounds Living systems Nucleosides Propellants Technetium compounds Grains Lubricants Nucleotides Prostaglandins Tellurides Granites Luminescent compounds Oils Proteases Tellurium compounds Graphites Lymphocytes Oligomers Proteins Terpenes Halides Lymphokines Oligonucleotides Proteinases Textiles Halogens Macrocycles Oligopeptides Protein kinases Therapeutic compounds Hemes Macromolecules Oligosaccharides Prothrombins Thermoelectric materials Magnesium compounds Oncogenes Psychoactive compounds Thorium compounds Hemoproteins Magnets Opiates Radicals Thyrotoxic compounds Herbicides Main-group compounds Ores salts Tin compounds Heterocycles Manganese compounds Osmiumcompounds Radiopharmaceutical Tissues Heteropoly acids Mantle Oxides compounds Titanates Heusler alloys Martensites Oxygenases Radium compounds Titanium compounds Histamine agonists Materials compounds Rare-earth compounds Tooth compounds Hormones Melts Oxyhydrides Reductases Toxins HSLA steels Membranes Palladium compounds Refractorycompounds Tranquillizers Humic compounds Mercury compounds Paper Renins Transcriptases Hydrates Metallacarboranes Parasites Rhenium compounds Transition elements Hydrides Metalloenzymes Particles Rhodium compounds Trypanosomes Hydrogen compounds Metallophthalocyanines Penicillins Ribosomes Trypsins Hydroxides Metalloporphyrins Peptaibols Ring molecules Turnours Hypnotics Metalloproteins Peptides RNA Tungstates Ice Metals Perovskites Rock Tungsten compounds II-VI compounds Meteorites Pesticides Rubber Unidirectional compounds IU-V compounds Micas Phosphatases Ruthenium compounds Unsaturated compounds Immunoglobulins Micelles Phosphates Saccharides Uranides Immuno modulators Microcrystallitecompounds Phosphorus compounds Salts Uranium compounds Immunosuppressants Minerals Phosphorylases Sandwich compounds Uricosuric compounds Indium compounds Mixed-layercompounds Photochromiccompounds Sapidants Vanadium compounds Inhibitors Mixed-valence compounds Photoconductors Sediments Vasodilators Insecticides Modulated structures Phyllosilicates Selenium compounds Venums Insulin Molecular complexes Pigments Semiconductors Viruses Intercalates Molecules Plag~oclases Semicrystalline compounds Vitamins Interstitial compounds Molybdates Plants Serums Invar Molybdenum compounds Plasmas Sesquiterpenes Waste Iodine compounds Moon rocks Platinum compounds Siderophores Water Ionic conductors Multilayers Plutonium compounds Silicates Waxes Ionophores Muscarinic compounds Polar compounds Silicon compounds Ytterbium compounds Iridium compounds Muscles Polyamides Silver compounds Zeolites Iron compounds Mutagenic compounds Polyanions Small molecules Zinc compounds Isomers Narcotics Polydentates Soaps Zirconium compounds Isopolymetallates Natural products Polyelectrolytes Sodium compounds Zymogen Isotopes Nematogenic compounds Polyesters Soils IV-VI compounds Nervous system Polyimidazoles Solids Polyiodides Sols