1.   The number of positive intra-epithelial lymphocytes was counted per unit length of epithelium and the number of positive lymphocytes within the lamina propria was counted per unit area.

2.   Density was expressed as the mean number of cells per unit mucosal area.

3.   Heat is a major problem in the design of complex chips, which can generate more heat per unit area than a halogen lamp.

4.   Utilising such bulk quantities of energy, we harvest about two to three tonnes of biomass from a unit area of high yielding land.

5.   Some sobbing relatives pushed away cameramen as officials sought to direct them to the sectioned-off crisis unit area.