Tác giả: Surber

The concept of expressing acidity as the negative logarithm of the hydrogen ion concentration was defined and termed p H in the beginning of the 20th century. The general usefulness of the p H concep …

Mucosal membranes have unique anatomical and physiological properties — differing from those of the keratinized epithelium — which affect drug or chemical absorption. This makes the diagnosis and t …