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Home > All Images > 1997 > July > 21 Jul 1997

Images Dated 21st July 1997

Choose from 17 pictures in our Images Dated 21st July 1997 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Col. freeze-fracture TEM of cell nucleus membrane Featured 21 Jul 1997 Image

Col. freeze-fracture TEM of cell nucleus membrane

Cell nucleus membrane. Coloured freeze-fracture transmission electron micrograph (TEM) of part of the nuclear membrane of a liver cell. The concave fracture-face of the outer membrane of a nucleus is seen. This membrane reveals rounded nuclear pores. Pores in the membrane allow large molecules to pass out of the nucleus into the cytoplasm to communicate with other parts of the cell. A double membrane encloses the nucleus to keep the cell's genetic material in a single unit. Around the nucleus can be seen cytoplasm with cell organelles (at lower frame). This cell specimen was frozen, then fractured to reveal its internal surfaces. Magnification: x25, 000 at 5x6 inch size

© DR KARI LOUNATMAA/SCIENCE PHOTO LIBRARY