CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of the external surface of a cell nucleus (yellow), showing the nuclear envelope, dotted with crater- like pores. The envelope consists of a double membrane which encloses the nuclear DNA. The pores are pathways for the transport of larger molecules between the nucleus & the cytoplasm. The image was produced by freezing the cell, fracturing it in a vacuum and then coating it with metal or carbon. This metal or carbon 'replica' was then photographed using an electron microscope. Magnification: x16,000 at 6x7cm, x8,000 at 35mm size.
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