Provided herein are compositions and methods for monitoring the movement of analytes andor cellular components across biological membranes. Among the new acridane-based compounds are water-soluble acridanes, enhancer coupled acridanes, bis and tris-acridanes as well as acridane-1,2-dioxetanes. The IO adapter attempts to write DMA data to the page. Access is permitted or denied according to access policies which define access in terms of the user groups and information sets. The portable sleeping assembling includes a base for removably mounting to transport, one or more walls extending from the base, each wall including one or more rigid panels, and a roof from which the one or more walls extend such that movement of the one or more walls moves the roof relative to the base. Furthermore, the cover can be firstly rotated vertically 180 degrees about the transverse shaft and then rotated horizontally 180 degrees about the axis of the vertical shaft to make the cover and the body be arranged side by side.