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American Chemical Society's weekly PressPac -- Jan. 9, 2008
Date:1/14/2008

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CONTACT: Srinivasan Damodaran, Ph.D.
Department of Food Science
University of Wisconsin
Madison, Wisconsin 53706
Phone: 608-263-2012
Fax: 608-262-6872
Email: sdamodar@wisc.edu

ARTICLE #3 FOR IMMEDIATE RELEASE

Solving the mystery of the metallic sheen of fish
Crystal Growth & Design

The bright, metallic sheen of fish skin source of endless fascination for fishermen and aquarium owners is due to a sophisticated system of crystals that enhance light reflection and may help fish hide from predators in the wild, scientists in Israel are reporting. Their study is scheduled for the current issue of ACS Crystal Growth & Design, a bi-monthly journal.

In the new study, Lia Addadi and colleagues note that researchers have known for years that guanine crystals in the skin underneath the scales of fish reflect light to produce a mirror-like sheen. This silvery reflectance acts as a form of camouflage that helps protect fish from predators as fish swim near the waters surface. However, the exact shape of these guanine crystals and how they work remained a mystery.

The researchers extracted guanine crystals from the skin of the Japanese Koi fish and analyzed the crystals using X-ray diffraction and an electron microscope. They compared the results to guanine crystals made in the laboratory. The researchers found that the biogenic crystals develop in an unexpected direction that differs from the lab-made crystals and that their unique shape improves
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Contact: Michael Woods
m_woods@acs.org
202-872-4400
American Chemical Society
Source:Eurekalert  

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American Chemical Society's weekly PressPac -- Jan. 9, 2008
American Chemical Society's weekly PressPac -- Jan. 9, 2008
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