Four a moufleThe percentage of total organic matter is obtained after calcination in an oven heated to 450 ° C. for 5 hours. The observed mass loss is attributed to organic matter. The weight of organic matter is obtained by the difference between the total weight and the weight of ash.

mass of organic matter = mass of total matter - mass of ash
% organic matter = (mass of organic matter / mass of total matter) x 100
Freeze dryers: principle of lyophilization

LyophilisateurLyophilization, or cold drying, is a process which removes the water contained in a sample in order to make it stable at room temperature and facilitate its conservation. Lyophilization uses a very simple physical principle called sublimation. Sublimation is the passage of an element from the solid state to the gaseous state directly without passing through the liquid state. In the case of water to be removed from the samples, the lyophilization steps are:

- Freezing the samples at -20 ° C so that the water they contain is in the form of ice.
- Then under the effect of vacuum, sublimation of the ice directly into water vapor.
- Condensation of water vapor using a trap or condenser (temperature  -50 ° C / -60 ° C).
- Once all the ice has sublimated, cold drying the samples.

Centrifugal vacuum evaporator

speedvac 150x200The centrifugal concentrator is intended for sample preparation. The centrifugal force prevents the spraying of solutions allowing to concentrate and recover the maximum of molecules during extraction. The vacuum and the possibility of heating accelerate the evaporation of solvents.

List of universities and institutes having an international partnership with LECOB


Universität Rostock

Max Planck Institute für Marine Mikrobiologie (MPI-MM), Bremen

  United Kingdom

National Oceanography Center Southampton (NOCS)

School of Earth and Environment, University of Leeds


Centre d'Estudis Avançats de Blanes (CEAB)


Universitat de Barcelona (UB)

Institut de Ciencies del Mar de l'Universitat de Barcelona (ICM)


Institut de Ciencia i Tecnologia Ambientals de l'Universitat Autònoma de Barcelona (ICTA)


Instituto de Diagnóstico Ambiental y Estudios del Agua (IDAEA)


Nederlands Instituut voor Onderzoek der Zee (NIOZ)


Göteborgs universitet


Universidade de São Paulo (USP)


Université du Québec à Rimouski (UQAR)

Université Laval à Québec

United States

Department of Marine Sciences of University of Georgia

University of Delaware (UDEL)

Woods Hole Oceanographic Institution (WHOI) 


 Australian Institute of Marine Science (AIMS)


 Japan Agency for Marine-Earth Science and Technology (JAMSTEC)


Basis of help in the identification of some SERPULIDAE (Annelids Polychetes) from the operculum (modified filament of the branchial plume).
To access the database hosted on the collaborative biodiversity data management platform, you must first:
- Send an email to the address This email address is being protected from spambots. You need JavaScript enabled to view it. to make your access request.
- You will then receive an email from This email address is being protected from spambots. You need JavaScript enabled to view it.
This email gives you the procedure to create your account in order to be able to access the database.
- After your registration and first access, you can access the database by clicking on the image below:
ditrupa 150x162
This database was created by François CHARLES from the Laboratory of Ecogeochemistry of Benthic Environments and by Christine LE MOUNI ER from the Systematic Knowledge Base Platform developed by the Computer Science and Systematics laboratory of UPMC (Click on the logo):
 lis 58x245

Habitat (macro-)characteristics are currently widely used to infer species assemblagesassociated to them in the context of marine protection extension and Marine SpatialPlanning directive implementation by institutional stakeholders. However, large gapsremain to explicitly link species functional traits and habitat properties (see Axis 1).This issue is particularly tricky in habitats hosting ecosystem engineer species whichstructure co-evolves with the ecosystem engineer population and individual growth.Ecosystem engineer refers to organisms that, through causing changes in the local physicalor biogeochemical conditions, directly or indirectly control the availability of resources(other than themselves) to other organisms and, thus, modify, maintain, or create habitats(Lawton 1994). Autogenic engineers modify their environment through physical changes, whileallogenic engineers do so through chemical transformations (Jones et al. 1994).

In fact,gorgonians, corals or other large symbiotic invertebrates interact with their physical andchemical environment by controlling the gradient of oxygen, CO2/pH, and organic and inorganicnutrients at their interface (Buhl Mortensen et al. 2009). Environmental modifications by ecosystemengineers have been largely studied at a macroscopic scale, but much less is known at the micro-scalewhere these exchange occur and the effect on associated biota. The hypothesis put forward in this axisis that hydrodynamical or biochemical micro-climates associated to particular benthic ecosystemengineers are key to facilitate or inhibit the functions that allows species assemblages to respondto environmental fluctuations (including natural and anthropogenic disturbance).