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Mechanics of integrated and artificial biological systems Mechanics of integrated and artificial biological systems Micro-organisms biophysics Micro-organisms biophysics Stochastic dynamics of reactive and living systems Stochastic dynamics of reactive and living systems Zebrafish and Danionella Cerebrum behavior and calcium imagery Zebrafish and Danionella Cerebrum behavior and calcium imagery EvoMorph - Evolution & Morphogenesis in molecular systems EvoMorph - Evolution & Morphogenesis in molecular systems
CNRS Sorbonne Université

Jean Perrin Laboratory

Since 2012

UMR 8237 · CNRS · Sorbonne Université

LJP at a glance

The activities of the LJP are directed towards the physics/biology interface. We develop new experimental approaches to probe the properties of complex biological systems at different scales, and we seek to build new physico-chemical systems whose behaviours could offer analogies with biological systems. The laboratory also includes a theoretical component in constant interaction with our experimental work.

Read the complete presentation of the laboratory

News

All
14/10/2026 Public statement of the non-permanent members of LJP 13/10/2026 New comers day 06/09/2026 Milica Denic joins the LJP as an assistant professor 29/06/2026 Different Brains share a common neural grammar 16/06/2026 PhD defense : Romain Leroux

Seminars

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27 Oct 2026 · Edo Kussel Gene Regulation, Phenotypic Memory, and Selection in Fluctuating Environments 3 Nov 2026 · Olivier Cochet-Escartin TBA 1 Dec 2026 · Anke Lindner How E-coli bacteria navigate flow and complex environments 29 Sep 2026 · Par Manon Carrière / Mathéo Aksil Séminaire interne: TBA 22 Sep 2026 · Heike Stein Dynamics and geometry of locomotor learning on complex terrain

Zoom on

Machining microstructures

Machining microstructures

Micromachining has become a serious alternative to soft photolithography to achieve surfaces with a controlled topography at micrometric scales.
Millifluidics for biology

Millifluidics for biology

Millifluidic devices of molded PDMS allow to impose different channel geometries and to fine-tune the system's hydrodynamical properties.
Lightsheet fluorescence microscopy

Lightsheet fluorescence microscopy

Thin slices of the sample are illuminated perpendicularly to the observation, enabling the recording of the activity of thousands of neurons.
Reading a whole brain

Reading a whole brain

The zebrafish larva is transparent: we record the activity of thousands of neurons there and tie it to swimming, to understand how a brain holds a posture and corrects its course.

Further information
When life moves in crowds

When life moves in crowds

Bacteria, cells or active particles: in numbers they align, jam and find their way through mazes. One and the same physics of crowds runs across our research themes.

Scientific outreach

Scientific outreach

Since 2023 the laboratory has welcomed school classes of every age: discovery workshops and high-school placements, where pupils experiment alongside the researchers.

Further information

One has only to examine under the microscope small particles placed in water to see that each of them, instead of falling steadily, is animated by a very lively and perfectly disordered motion. It comes and goes, spinning, rises, sinks, rises again, with no tendency whatever towards rest.