Mechanism of Action. Levocetirizine, the active enantiomer of cetirizine, is an anti histamine; its principal effects are mediated via selective inhibition of H1 receptors. The antihistaminic activity of levocetirizine has been documented in a variety of animal and human models. In vitro binding studies revealed that levocetirizine has an affinity for the human H1-receptor 2-fold higher than that of cetirizine (Ki = 3 nmol/L vs. 6 nmol/L, respectively).
A glacier calf, or chunk of ice, measuring nearly five square miles broke away from Greenland's Jakobshavn glacier sometime in August, making it the largest piece to ever break away from one of the world's fastest melting glaciers. glacier, calf, iceberg, jakobshavn, greenland.
The world's longest glacier is the Lambert-Fisher glacier at an icy 320 miles in length and a not-so-hot 25 miles in width.   The Lambert-Fisher glacier is a speed de â¦ mon as far as slow moving masses of ice go, moving over a half mile each year.   The world's longest glacier is the Lambert-Fisher glacier at an icy 320 miles in length and a not-so-hot 25 miles in width.   The Lambert-Fisher glacier is a speed demon as far as slow moving masses of ice go, moving over a half mile each year. 1 person found this useful. Answered.