Home About Us Research People Visitors International Cooperation News Education & Training Join Us Papers Resources Links Societies & Publications
News
Events
Pic News
Int’l Cooperation News
Forums & Lectute
Location: Home > News > Events
 
Squid lens and pidan: their material similarities
 
Date: 2017-12-21
Time: 15:00
Venue: 中国科学院物理研究所M253会议室
Speaker: Dr. Jing CAI

University of Pennsylvania

Abstract:
Underwater vision requires a spherical lens to enable enough photon flux injecting into the camera-like eyes.  The refractive index in the lens has a gradient to eliminate spherical aberration.  Here, I present the squid lens system, where the whole lens is self-assembled using only one type of proteins.  Using small angle X-ray scattering and computational methods, I studied how the proteins interact and the resulted in the homogeneous phase of the lens system.  Results showed that the proteins are patchy particles with various patch numbers.  The lens is assembled by distributing different patch number proteins at different radial positions to achieve both graded refractive index while maintaining transparency.

The lens system is very similar to pidan where the egg white proteins experienced a transition to form the gelled structure.  We found that during this transition, the beta-sheet structure was preserved, whereas most of the other parts of the protein was unfolded.  The unfolded part serves as the patches and the gelled structure was formed by this attractive interaction.  At the end, I also compared the pidan to the squid lens, and generalized the requirements of proteins as patchy particle that form transparent gels.

联系人:叶方富(电话:82649779)


The Institute of Physics, Chinese Academy of Sciences P.O.Box 603,Beijing 100190,China
Tel:86-10-82649361 Fax:86-10-82649531 email: zhoumb@aphy.iphy.ac.cn
© Copyright The Institute of Physics