0 a chemical element that is present in teeth, bones, and chalk
1 a chemical element present in teeth, bones, and chalk (= type of soft, white rock)
Besides these four elements, living organisms commonly contain sulphur, phosphorus, chlorine, potassium, sodium, calcium, magnesium and iron.
Calcium and chlorine are rarer than on earth, sodium is somewhat commoner.
Normal blood albumen is essentially a compound of calcium and sodium into which iron and sulphur both enter.
Redundant mechanisms of calcium-induced calcium release underlying calcium waves during fertilization of sea urchin eggs.
In the present work we wanted to verify whether oocytes recovered from preantral follicles were able to acquire calcium activity during follicle culture.
It is uncertain, however, how a high concentration of calcium in the absence of lactate inhibits capacitation.