The iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body; it consists of a protein (globulin), and haem (a porphyrin ring with an atom of iron at its centre).
Blood plasma, free of suspended cells, used in transfusions.
A clear component of blood or lymph containing fibrin.
A state of matter consisting of partially ionized gas and electrons.
A visual effect in which cycles of changing colours are warped in various ways to give the illusion of liquid organic movement.
A variety of green quartz, used in ancient times for making engraved ornaments.