A method and system for maintaining integrity of metadata associated with a migrated file. The cargo hold floor comprises a multiplicity of panels to form the cargo hold floor, wherein the panels have rail segments to form rails extending over several profile panels and arranged in a longitudinal direction of the aircraft. A wick structure is received in and attached to an inner side of the housing. An in-plane retardation of the optical film is from 300 nm to 430 nm. The subject invention also concerns methods for detecting the presence of Oxalobacter formigenes organisms in a sample, and the polynucleotide probes and primers used in the detection method. The image-taking mechanism is provided on a vehicle and used to take an image in front of the vehicle.