This website uses its own and third-party cookies. Some of these cookies are used to develop analytical statistics of visits to the webpage, others to manage advertising or even others are necessary for the correct management of the site. If you continue to browse or click in accept we consider you accept the conditions for their use. You can get more information, or learn how to change the settings in our cookies policy?
Versión Española Versión Mexicana Ibercampus English Version Version française Versione italiana

7/7/2020  
    Ibercampus  | Editorial Board | Who we are | Ideology | Contact | Advertising rates | Subscription | RSS RSS
Policies
Inclusion policies
R&D
Employment
Economics
Culture
Green strategies
Health
Society and consumer
Sports
Debates
Interviews
Education
Grants & internships
Training
Trends
Enterprises & CSR
 Enterprises & CSR
ACNUR
AEGON
AIR LIQUIDE
ALCATEL-LUCENT
ALLIANZ
ARCELORMITTAL
ASIFIN
ASSICURAZIONI GENERALI
AXA
BANCO SANTANDER
BASF
BAYER
BBVA
BNP PARIBAS
CARREFOUR
DAIMLER AG
DEUTSCHE BANK
DEUTSCHE BÖRSE
DEUTSCHE TELEKOM
E.ON
ENEL
ENI
FORTIS
FRANCE TÉLÉCOM
GROUPE DANONE
IBERDROLA
INDITEX
ING GROUP
INTESA SANPAOLO
L'ORÉAL
LVMH
MUNICH RE
NOKIA
PHILIPS
RENAULT
REPSOL YPF
RWE
SAINT GOBAIN
SANOFI-AVENTIS
SAP AG
SCHNEIDER ELECTRIC
SIEMENS AG
SOCIÉTÉ GÉNÉRALE
SUEZ
TELECOM ITALIA
TELEFÓNICA
TOTAL S.A.
UNICREDIT
UNILEVER
VINCI
VIVENDI
VOLKSWAGEN

R&D
University of Geneva

Researchers explain how chameleons change color


According to a team of scientists at the University of Geneva, Switzerland, chameleons shift color through active tuning of a lattice of nanocrystals within a thick layer of dermal cells called iridophores.
Ibercampus 17/3/2015 Send to a friend
Comparte esta noticia en TwitterFacebookTwitterdel.icio.usYahooRSS
In a new study published in the journal Nature Communications, Swiss researchers demonstrated that these changes take place via the active tuning of a lattice of nanocrystals present in a superficial layer of iridophores.

Researchers found the results by studying the panther chameleon, from Madagascar. They found tah that the chameleon actively controls how the cells are arranged, and what colour it will be.

The scientists also reveal the existence of a deeper population of iridophores with larger and less ordered crystals that reflect the infrared light.

The organization of iridophores into two superimposed layers constitutes an evolutionary novelty and it allows the chameleons to rapidly shift between efficient camouflage and spectacular display, while providing passive thermal protection.

“Besides brown, red and yellow pigments, chameleons display so-called structural colors,” said study senior author Prof Michel Milinkovitch from the University of Geneva’s Department of Genetics and Evolution.

“These colors are generated without pigments, via a physical phenomenon of optical interference. They result from interactions between certain wavelengths and nanostructures, such as tiny crystals present in the skin of the reptiles. These crystals are arranged in layers that alternate with cytoplasm, within iridophores.”

“The structure thus formed allows a selective reflection of certain wavelengths, which contributes to the vivid colors of numerous reptiles.”

To determine how the transition from one flashy color to another one is carried out in the panther chameleon, Prof Milinkovitch and his colleagues used their expertise in both quantum physics and in evolutionary biology.

“We discovered that the animal changes its colors via the active tuning of a lattice of nanocrystals,” said co-authors Dr Jérémie Teyssier and Dr Suzanne Saenko.

“When the chameleon is calm, the latter are organized into a dense network and reflect the blue wavelengths.”

“In contrast, when excited, it loosens its lattice of nanocrystals, which allows the reflection of other colors, such as yellows or reds.”

“This constitutes a unique example of an auto-organized intracellular optical system controlled by the chameleon,” they said.

Other issues R&D
China, Germany, Japan, Korea and the United States dominate global innovation - WIPO report 2019
New methodology developed to monitor patients with glioblastoma
Scientists find a place on Earth where there is no life
The embryonic origin of the Cyclops eye
Graphene activates immune cells helping bone regeneration in mice
Jurassic dinosaurs could have been dispersed between Africa and Europe 145 years ago
China´s Chang´e-4 probe lands on the moon
Artificial intelligence for studying the ancient human populations of Patagonia.
Chinese and European scientists propose 28 complementary colours
EU-wide rules for safety of drones approved by European Parliament

Subscribe free to our newsletter
Human Capital
Mobilizing commitment around change
Marta Santos Romero
Vanity Fea
Let´s get serious with Coronavirus
José Ángel García Landa
We can all be leaders
VIDEOCOMMUTING A NEW ORGANIZATIONAL REALITY THAT POSITIVELY IMPACTS EMPLOYEES
Mar Souto Romero
Financial inclusion
Financial Education For All!
Carlos Trias
Brusselian Lights
European elections (I): which words are more used in the European political manifestos?
Raúl Muriel Carrasco
Humor and Political Communication
Comisión de Arbitraje, Quejas y Deontología (Spain) (3) You can´t be too careful
Felicísimo Valbuena
Want your own blog? Want to be read by universities?
Find out here
Books
"Tthe study of human behaviour was political from the beginning"
The EU "An Obituary"
Startup Cities "Why Only a Few Cities Dominate the Global Startup Scene"
Blockchain Revolution "How the Technology Behind Bitcoin and Cryptocurrency Is Changing the World "
Doughnut Economics "Seven Ways to Think Like a 21st-Century Economist "
The People vs Tech "How the Internet Is Killing Democracy"
Theses and dissertations
1 Mobilizing commitment around change
Legal Advise | Privacy Policy | Editorial Board | Who we are | Ideology | Contact | Advertising rates | RSS RSS