Canal-U

Mon compte
LE STUDIUM Loire Valley Institute for Advanced Studies

Prof. Marc McKee - The structure of avian (chicken) eggshell


Copier le code pour partager la vidéo :
<div style="position:relative;padding-bottom:56.25%;padding-top:10px;height:0;overflow:hidden;"><iframe src="https://www.canal-u.tv/video/le_studium/embed.1/prof_marc_mckee_the_structure_of_avian_chicken_eggshell.60587?width=100%&amp;height=100%" style="position:absolute;top:0;left:0;width:100%;height: 100%;" width="550" height="306" frameborder="0" allowfullscreen scrolling="no"></iframe></div> Si vous souhaitez partager une séquence, indiquez le début de celle-ci , et copiez le code : h m s
Contacter la chaine
J’aime
Imprimer
partager facebook twitter

Prof. Marc McKee - The structure of avian (chicken) eggshell

The functional properties of biomineralized structures found in Nature result from interactions between their hybrid components – both organic (mostly proteins) and inorganic (mineral) phases – to generate hierarchical organization across different length scales.  In its dual function, the calcitic avian eggshell provides a protective barrier for the enclosed developing chick embryo while also serving to provide calcium for the growing chick skeleton by the process of shell dissolution.  Here, a detailed structural analysis (including a description of nanostructure) is given for the eggshell produced by the domesticated chicken, along with changes that occur following eggshell dissolution – a shell-thinning and weakening process leading to hatching of the chick (pipping) which occurs after egg fertilization and incubation.  Eggshell contains abundant proteins, and the localization of some of these (particularly osteopontin) will be described at the ultrastructural level, and correlated with generating nanostructure and shell hardness.  X-ray and electron imaging and diffraction data, together with atomic force microscopy observations, describe an aligned nanostructure of mineral within the shell.  A similar nanostructure could be reproduced in synthetic calcite crystals by the simple addition of osteopontin, which becomes occluded within the calcite to generate this mineralization pattern.  Taken together, these findings are consistent with this protein's mineral-binding and regulatory role in biomineralization in a large number of biological systems, and point to a highly conserved, mineral nanostructure-regulating activity of osteopontin conserved over at least 300 million years of evolution.

 


  •  
  •  
    Date de réalisation : 23 Mars 2021
    Durée du programme : 30 min
    Classification Dewey : Biochimie
  •  
    Catégorie : Conférences
    Niveau : Tous publics / hors niveau
    Disciplines : Chimie
    Collections : Innate immunity in a biomineralized context: trade-offs or synergies?
    ficheLom : Voir la fiche LOM
  •  
  •  
    Langue : Anglais
    Mots-clés : coquille oeuf
    Conditions d’utilisation / Copyright : @LE STUDIUM 2021
 

commentaires


Ajouter un commentaire Lire les commentaires
*Les champs suivis d’un astérisque sont obligatoires.
Aucun commentaire sur cette vidéo pour le moment (les commentaires font l’objet d’une modération)
 

Dans la même collection

FMSH
 
Facebook Twitter
Mon Compte