| OSS | over-the-shoulder strap |
|---|---|
| OTC | ornithine transcarbamylase; oval target cell; over-the-counter; oxytetracycline |
| POSS | proximal over-shoulder strap |
| SCO | sclerocystic ovary; somatic crossing-over; subcommissural organ |
| CIA | chemiluminescent immunoassay; chymotrypsin inhibitor activity; colony-inhibiting activity; congenita... |
| optical activity | The ability of a material to rotate the plane of polarized light. (09 Oct 1997) |
|---|---|
| triggered activity | One or a series of spontaneously generated heart beats originating from an action potential that produces an after-depolarisation which reaches activation threshold. (05 Mar 2000) |
| unit of thyrotrophic activity | The activity of an amount of an extract of the anterior lobe of the hypophysis which, given daily for 5 days, will cause the thyroid of a guinea pig (weighing 200 g) to reach a weight of 600 mg. (05 Mar 2000) |
| zone of polarizing activity | <cell biology> The small group of mesenchyme cells in avian limb buds that is located at the posterior margin of the developing bud and that produces a substance, possibly retinoic acid, that provides positional information to the developing limb bud. (18 Nov 1997) |