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:

Nanoparticles - a target for speciation analysis | EVISA's News
Instrument database: Aurora Biomed - Crysta 500 Water Purification System
Determination of Thallium Species in Food Samples by Microextraction and Graphite Furnace Atomic Absorption Spectrometry | EVISA's News
Journals database: Biochimica et Biophysica Acta: BBA. Biomembranes
Instrument database: Analytik Jena GmbH - mercur Duo plus Combined AAS/AFS spectrometer for mercury determination
Arsenic-Containing Phosphatidylcholines Discovered in Herring Caviar | EVISA's News
Speciation matters even if the interest is in total element concentration | EVISA's News
Journals database: Journal of Environmental Health Science & Engineering
Instrument database: Shimadzu Europe - AXIMA-CFR plus MALDI TOF Mass Spectrometer
Instrument database: Elemental Scientific Inc. (ESI) - Areo membrane desolvation unit
Journals database: Computers and Chemical Engineering
Journals database: Journal of Environmental Chemical Engineering
Material database: National Institute for Environmental Studies (NIES) - NIES CRM 18: Human Urine
Instrument database: Teledyne Instruments Leeman Labs Inc. - Hydra AF Gold Plus Mercury Analyzer
Instrument database: Dionex Corporation - ICS-1600 Standard Integrated IC System
Link database: OSHA Method ID-189: Cadmium In Workplace Atmospheres
Link database: SSWM: Arsenic Removal Techniques
Speciation and Toxicity: Humic Acids Increase Lead Bioavailability and Toxicity for Marine Invertebrates | EVISA's News
Instrument database: Elemental Scientific Inc. (ESI) - Apex IR Isotope ratio sample inlet system
Journals database: Molecular and Biochemical Parasitology