Julien Colomb

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flying and not flying flies

on Thursday, June 30th, 2011 11:35

I checked the putative non-flying flies we ordered. All are normal when grown at 18°. While developing at 25°, different phenotypes can be seen:
CyK: those flies have curled wings, but can fly.
U2: those flies have curled wings, cannot fly, but still beat their wings while walking (like if they could not figure out that they cannot fly ?).

other flies show no phenotype at all.

buridan update

on Wednesday, May 11th, 2011 10:45

buridan analysis v.2.5 online:
analysis of single flies added, produce a different pdf file.
several minor changes accordingly to this analysis.

on the front of Buridan analysis

on Wednesday, April 20th, 2011 6:29

By looking at a way to simulate activity/inactivity pattern in the computer generated walk, I found this:

Fractal time in animal behaviour: the movement activity of Drosophila” Blaine J. Cole 1993

I read it, now I need to search more in order to understand it: maybe we can find ideas to perform more analyses (or corrections to the version we have) and to get better simulated data (how to determine mu in the levy walks)

“Foraging Fruit Flies: Lagrangian and Eulerian, Descriptions of Insect Swarming”
Joseph D. Majkut
phd Thesis


mu has to be lower or equal to 3: that’s already some information!

ohh science: the closer we look, the most complex it becomes… I love it!

Category: buridan | 1 Comment

can we link news to specific projects?

on Friday, April 15th, 2011 7:19

it would be good to link news and projects, to have the news appearing on the main page and on the project page.


on Thursday, April 14th, 2011 6:15

the new home page looks much better indeed!



first flight simulator experiment

on Wednesday, April 22nd, 2009 5:34

While Bjoern is in Hawaii, I used the flight simulator.

I got sufficient good flies to do 4 experiments. That’s really encouraging that the majority of the flies survived, kept their hook and flew for more than the 20 minutes required!

The other side of the coin is that I did not had any learning effect, and fly do not even avoid the punished side during the training phases: it seems something’s wrong with the laser. I bet that there is a very important trick I don’t know about the laser alignment…

but Everything will work!

things progressing

on Friday, March 13th, 2009 12:52

after one week, the pattern of my work here start to emerge: flies are ordered, crossings are planned, and a beautiful side project (waiting for the new flight simulator) is planned:
establish appetitive olfactory learning in Berlin.

My last post-doc dealt with appetitive learning, I would love to do one last control experiment in Berlin with a new protocol. The use of a H-maze will be more “hand-made” paradigm, but if it works well, it may well be developed further…

nice time to come…

Monday, I will present my project(s)… have to work on it!

new arrival

on Thursday, March 5th, 2009 4:23

That’s it. I am finally at the bench, working in Berlin. what else to say? Future looks great… present already is. Krrrrraaaaasssssssss