Minerals From Sea Water
There are a number of marine invertebrates that use minerals that are present in the sea in such minute quantities that they were undetectable until the advent of spectroscopy. Vanadium is concentrated by some tunicates for use in their blood cells to a level ten million times that of the surrounding seawater. Other tunicates similarly concentrate niobium and tantalum. Lobsters use copper in their respiratory pigment hemocyanin, despite the proportion of this metal in seawater being minute. Although these elements are present in vast quantities in the ocean, their extraction by man is not economic.
Read more about this topic: Marine Invertebrates
Famous quotes containing the words sea and/or water:
“I have not much faith in women in fiction.... Women are so horribly subjective and they have such scorn for the healthy commonplace. When a woman writes a story of adventure, a stout sea tale, a manly battle yarn, anything without wine, women, and love, then I will begin to hope for something great from them, not before.”
—Willa Cather (1873–1947)
“It may be that through habit these do best,
Coming to water clumsily undressed
Yearly; teaching their children by a sort
Of clowning; helping the old, too, as they ought.”
—Philip Larkin (1922–1986)