Clinical Applications 1  : A very sensitive (83%) and highly specific (96%) diagnostic marker in the evaluation of actual or suspected pheochromocytoma. 2  Drugs commonly employed in the diagnosis or treatment of pheochromocytoma has little effect on the plasma chromogranin A level. 3  To ascertain the source of a tumor.ntroduction : Chromogranin A belongs to the acidic, soluble protein present in the secretory vesicles of neuroendocrine. Immunohistochemical studies have demonstrated that chromogranin A is present in virtually all granulecontaining. endocrine cells and in the great majority of tumors of neuroendocrine origin.
Lenses with the 'G' designation don't have an aperture ring. Aperture has to be set through the camera. AFS lenses have the focusing motor built into the lens. Usually much quieter and faster focusing than regular AF lenses that have the focusing motor in the body and mechanically focus the lens.: The lens has no aperture control ring and is designed to be used with cameras that allow setting the aperture from the camera body. G lenses also provide Distance information to the camera.
noun. The lens in these glasses are blue. The lens in these glasses are blue. The definition of a lens is a piece of glass or other hard clear material molded with one side flat and the other curved or both sides curved that forms an image by bringing together or spreading the light that passes through it.1  An example of lens is the clear pieces covering the eyes in eye glasses.ens-Computer Definition. The glass or plastic elements that focus light onto analog film or a digital sensor in a still or video camera. Lens quality is just as important in digital cameras as it was in the Daguerreotype cameras in the 1800s.