In biology a thin, pliable layer of tissue covering surfaces or separating or connecting regions, structures, or organs of an animal or a plant.
In chemistry a membrane is a thin sheet of natural or synthetic material that can be penetrated, especially by liquids or gases.
In environmental applications of nanotechnology a membrane can be used as a filter.

The term "membrane" was found in the following pages:

LC-ICP-MS: The most often used hyphenated system for speciation analysis | EVISA's News
Toxicity of organomercury compounds | EVISA's News
Journals database: International Journal of Pharmaceutics
Instrument database: Teledyne Instruments Leeman Labs Inc. - Hydra AF Mercury Analyzer
Instrument database: Analytik Jena AG - mercur Combined AAS/AFS spectrometer for mercury determination
Speciation and Toxicity: Humic Acids Increase Lead Bioavailability and Toxicity for Marine Invertebrates | EVISA's News
Material database: National Institute for Environmental Studies (NIES) - NIES CRM 18: Human Urine
Instrument database: Dionex Corporation - ICS-1600 Standard Integrated IC System
Journals database: Protoplasma
Journals database: Computers and Chemical Engineering
Journals database: Molecular and Biochemical Parasitology
Instrument database: Teledyne CETAC Technologies - HGX-200 Hydride Generation and Cold Vapor System
Journals database: Separation and Purification Reviews
Link database: SSWM: Arsenic Removal Techniques
Journals database: Journal of Environmental Chemical Engineering
Instrument database: Analytik Jena AG - Mercur - Atomic fluorescence spectrometer for mercury determination
Journals database: Indian Journal of Chemical Technology
Instrument database: Teledyne Instruments Leeman Labs Inc. - Hydra AF Gold Plus Mercury Analyzer
Fractionation as a first step towards speciation analysis | EVISA's News
Instrument database: Shimadzu Europe - AXIMA-CFR plus MALDI TOF Mass Spectrometer