The toxicity of mercury ion and pesticide cy-permethrin to tetrahymena pyriformis was observed in this study according to the method of aquatic toxicology.
There are 5 stages during the development of embryo, including the stage of 2-celled proembryo, multicellular proembryo, globular proembryo, pyriform proembryo, differential embryo and mature embryo.
The gallbladder, a pear-shaped sac behind the lower portion of the liver, stores bile, which is continuously secreted by the hepatic cells between meals.
In the uniquely mammalian process of lactation, a special class of milk-secreting cells known as mammocytes line up in a single layer around pear-shaped alveoli.
In the centre of each there was just one piece of jewelry, an ear-ring consisting of a big pear-shaped diamond hanging from another perfect stone, circular and brilliant-cut.
" Well, take one, anyhow, " advised Trot; but the cocoanuts were gone now, and a deep, purple, pear-shaped fruit which was unknown to them took their place.
The cholecystokinin makes its way to the gallbladder, the thin walled, green sac snuggling up against the liver, and signals it to squeeze out some bile through the cystic and bile ducts into the small intestine.