Fig. 1From: Oxygen consumption rate and Na+/K+-ATPase activity in early developmental stages of the sea urchin Paracentrotus lividus Lam.Time course of oxygen consumption rate of unfertilized and fertilized eggs of the sea urchin Paracentrotus lividus Lam. During a 15-min exposure in an oxygen electrode chamber, unfertilized eggs showed a low and stable oxygen consumption rate (N.E.; 0–15 min). The times of insemination (I), formation of the fertilization membrane (F) and addition of rotenone (RO) are indicated by arrows. Mean values ± SD of six samples eachBack to article page