Curare is a substance that, when ingested, blocks a receptor for acetylcholine in muscles, causing paralysis. Curare is thus an example of an substance that is an for acetylcholine.

this protocol provides a detailed procedure for total protein extraction for western blot analysis from achieved samples following trizol isolation of rna.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).