Abstract: Provided is a means for detecting a subject with mild cognitive impairment or assisting in the detection thereof. A biomarker for testing for mild cognitive impairment, comprising Claudin-5.

Abstract: Disclosed is a lock container for compact disks and the like comprising a casing having an opening to permit a compact disk to get in or out on its rear side, and a push button-like locking means provided to the top side of the casing to prevent the compact disk from getting out of the rear opening in locking condition. The push button-like locking means comprises a lateral spring strip and an associated movable push piece. The lateral spring strip is responsive to depression of the push piece for catching the step-like projection of the push piece, thereby fastening the compact disk with the latch, and is responsive to application of magnetic force for releasing the step-like projection of the push piece from the lateral spring strip. Thus, the lock container can be locked simply by depressing the push piece, and can be unlocked simply by applying a magnet to the casing.