A resorbable interbody fusion device for use in spinal fixation is disclosed. The methods combine the benefits of gas membrane separation with cryogenic temperatures. and at pH of at least 1 for a period of at least ten weeks at 60\xb0 C. The secret may be updated either periodically or at the request of a network administrator, and reauthentication of the wireless network may be required. Also disclosed is a flow through device for the detection of amines in a sample.