Samples must be shipped in a padded envelope or box. Matrix proteins inside the envelope stabilise virus structure. The reeds are hermetically sealed within a tubular glass envelope. Double membrane of chloroplast envelope surrounds the chloroplast. The first known envelope was nothing like the paper envelope of today. This describes a large rigidly framed outer envelope containing several separate gasbags. Reed switches with a vacuum inside the glass envelope can switch thousands of volts. Nests are layered hexagonal combs covered by a mottled gray paper envelope. Viruses can have a lipid "envelope" derived from the host cell membrane. An intermediate form with partial degradation of the nuclear envelope is called "semiopen" mitosis. She'd been holding an empty envelope. It is a component of the building envelope. The filter may be controlled with a second ADSR envelope. I feel sure your name upon the envelope will be sufficient. Imagine what might be in the first envelope.