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| B | C | D
| E | F | G
| H | I | J
| K | L | M
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P | Q | R | S
| T | U | V | W
| X | Y | Z
U
ultraviolet radiation (UV) Electromagnetic radiation
with wavelengths between 200 nanometers and 400 nanometers. Exposure
to excessive UV radiation damages DNA and
can cause health problems such as skin cancer and cataracts in
the eyes.
Unit cell The minimum repeat unit within a crystal.
Image courtesy of David L. Clark, Los Alamos National
Laboratory
Unit cell of fcc plutonium dioxide. Plutonium dioxide exhibits
the well-known Fluorite crystal structure. Plutonium atoms are
shown in green, and oxygen atoms are shown in red.
Unitary Matrix Also known as Identity
Matrix. A scoring system in which only identical characters receive
a positive score.
Author: Tug Sezen
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