Silica GelSilicon DioxideGelsChromatography, Thin LayerSilicosisChromatography, High Pressure LiquidFermentationPhysicochemical PhenomenaChemistry, PhysicalStreptomycesSilanesAdsorptionSpectrophotometry, InfraredMagnetic Resonance SpectroscopyPorosityMolecular StructureBenzylammonium CompoundsEthylenethioureaBoric AcidsSurface PropertiesNanoparticlesChromatographyDustQuartzEnzymes, ImmobilizedHexanesIndicators and ReagentsSpectrometry, Mass, Fast Atom BombardmentSilver NitrateCoccidiostatsForssman AntigenSiliconMiningSpectrophotometry, UltravioletMetals, Rare EarthSpectrophotometry, AtomicChromatography, GasChemistryPlant ExtractsDensitometryChemical PhenomenaCerebrosidesMethodsMicroscopy, Electron, ScanningMicrochemistryNiobiumHydrogen-Ion ConcentrationParticle SizeStereoisomerismMass SpectrometryColloidsSilicic AcidStigmasterolGlycolipidsFungiOccupational Exposure