In this early work, however, the activating effects of the natural ligand, acetylcholine, were not measured and, also, atropine apparently only partially inhibited the receptor. In the current paper, therefore, we recloned this receptor (named A-type mAChR) and found that the cDNA sequence published in Shapiro et al.
At an early age we learn that the color of the water in our lakes, rivers and ponds is blue, but we expect the water in our drinking glass to be clear. When homeowners discover their home drinking water has a slight blue tint, itâs cause for concern. Blue or blue-green water likely means it contains copper.
Quick Answer. Pool water turns brown due to high iron levels. Water from certain sources, such as wells, contains dissolved iron that oxidizes readily and turns brown when in contact with air. Acidic pool water, on the other hand, deteriorates metal equipment in the pool, introducing excess iron into the water. Continue Reading.