Digestibility of phosphorus in laying hens fed a wheat-maize-soyabean diet and the excreta phosphorus fractions

A two-part electromagnetic radiation shielding device (10) for mounting on a Printed Circuit Board (PCB). The device (10) comprises a substantially open frame member (6) for receiving an electric or electronic component requiring shielding, and a closing can or cover member (1). The frame and cover members (6; 1) are constructed from electrically conductive material and have peripheral sides (7; 3) adapted to grip each other such that, in use, the frame and cover member (6; 1) surround the component in a closing arrangement. The peripheral sides (7; 3) of the frame and cover member (6; 1) have a shape such that a continuous gripping force is exerted (14) to establish and maintain circumferential electrical contact (13) between the frame and cover member (6; 1) at facing edges (5; 11) of the peripheral sides (3; 7) of the members (1; 6). Separate mechanical (14) and electrical (13) engagements are provided for optimum Electro Magnetic Compatibility (EMC) shielding.