An electronic endoscope has a video-scope with an image sensor, a light source that radiates illuminating-light on an object, and a brightness adjuster that maintains a brightness of an object image at a proper brightness on the basis of an amount of illuminating-light. A bottom layer is laid down into a forming tool. The lid element is configured in one piece and with inherent rigidity and can be moved out of its closed position into the open position by interacting guide elements disposed on the basic body and on the lid element through a combined pivoting and displacing movement. Methods for separating bleed air fed directly from an aircraft precooler to a high temperature gas separation hollow fiber membrane, to provide NEA, are also disclosed. The material comprises at least about 10 atom percent gallium, with the balance comprising at least one of aluminum and boron.