BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Liquid–solid interaction at nanoscale and its application in veg
 etal biology
DTSTART:20111206T171500
DTSTAMP:20260916T061327Z
UID:0fcd0870549f7f6251969c4b4b1eede90d271a96bf870b9eedf17f0d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Henri Gouin\, Université Aix-Marseille\, C.N.R.S\, Fran
 ce\nThe water ascent in tall trees is subject to controversy: the vegetal 
 \nbiologists debate on the validity of the cohesion–tension theory which
  \nconsiders strong negative pressures in microtubes of xylem carrying the
  \ncrude sap. This work aims to point out that liquids are submitted at th
 e \nwalls to intermolecular forces inferring density gradients making \nhe
 terogeneous liquid layers and therefore disqualifying the Navier–\nStoke
 s equations for nanofilms. The crude sap motion takes the \ndisjoining pre
 ssure gradient into account and the sap flow dramatically \nincreases such
  that the watering of nanolayers may be analogous to a \nmicroscopic flow.
  Application to microtubes of xylem avoids the problem \nof cavitation and
  enables us to understand why the ascent of sap is \npossible for very hig
 h trees.
LOCATION:MEB 331
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR