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Acanthaire, "Acantharea" et micro-algues symbiotiques intracellulaires (cellules jaunes). Cette image a été réalisée dans le cadre d'une étude de la symbiose entre les acanthaires et la micro-algue "Phaeocystis", deux micro-organismes du plancton marin. Cette étude a montré que cette forme unique de symbiose profite essentiellement aux acanthaires (hôtes). L'architecture cellulaire et le métabolisme des micro-algues sont vraisemblablement modifiés en symbiose par l'acanthaire pour bénéficier…

Laurent Blanchoin, médaille d'argent du CNRS 2019. Chercheur en biochimie du cytosquelette et co-responsable de l’équipe CytomorphoLab de l’Institut de recherche interdisciplinaire de Grenoble, unité de Physiologie cellulaire et végétale.

3D reconstruction of a microalgae in the diatom group, phaeodactylum tricornutum. The cellular complexity of diatoms, a major group of marine phytoplankton, is only now becoming apparent. Studying series of cross-sections produced using electron microscopy reveals the three-dimensional organisation of organelles inside their cells. The scientists produced a 3D reconstruction of diatom cells, showing their internal ultrastructure and compartments. This model also enabled them to understand how…

Pollen grains from the Easter lily (lilium longiflorum), at various stages of germination, observed under an optical microscope. The pollen tube formation process can be observed. The aim of this research is to understand the role of lipids (particularly galactolipids) in the rapid growth of pollen tubes.

Cells treated with LIMK inhibitor Pyr1 have increased Detyr-microtubule content. HeLa cells were treated for 2 hours with 25 µM of Pyr1, the newly discovered LIMK inhbitor. Stabilized microtubules (green) are visualized using a Detyr-tubulin antibody. Mitochondria (red) are stained using mitotracker ® and cell nuclei are stained in blue, using Hoechst reagent

Cells treated with Paclitaxel have increased Detyr-microtubule content. HeLa cells were treated for 2 hours with 5 µM of paclitaxel (Taxol®) a known microtubule stabilizing agent. Stabilized microtubules (green) are visualized using a Detyr-tubulin antibody. Actin microfilaments (red) are stained with fluorescent phalloidin and cell nuclei are stained in blue, using Hoechst reagent.

Epidermal cells in a petal of thale cress (arabidopsis thaliana), observed using scanning electron microscopy at partial water vapour pressure (ESEM mode). Scientists are studying how certain transcription factors, particularly those in the MADS-box gene family (the MADS-box is a motif common to certain transcription factors, taking its name from the first four factors in which it was identified: MCM1, Agamous, Deficiens and SRF), influence the formation of flower organs (sepals, petals,…

Upper part of the carpel on thale cress (arabidopsis thaliana), observed using scanning electron microscopy at partial water vapour pressure (ESEM mode). Scientists are studying how certain transcription factors, particularly those in the MADS-box gene family (the MADS-box is a motif common to certain transcription factors, taking its name from the first four factors in which it was identified: MCM1, Agamous, Deficiens and SRF), influence the formation of flower organs (sepals, petals, stamens…

Epidermal cells in a petal of thale cress (arabidopsis thaliana), observed using scanning electron microscopy at partial water vapour pressure (ESEM mode). Scientists are studying how certain transcription factors, particularly those in the MADS-box gene family (the MADS-box is a motif common to certain transcription factors, taking its name from the first four factors in which it was identified: MCM1, Agamous, Deficiens and SRF), influence the formation of flower organs (sepals, petals,…

Upper part of the carpel on a mutant thale cress (arabidopsis thaliana), observed using scanning electron microscopy at partial water vapour pressure (ESEM mode). Scientists are studying how certain transcription factors, particularly those in the MADS-box gene family (the MADS-box is a motif common to certain transcription factors, taking its name from the first four factors in which it was identified: MCM1, Agamous, Deficiens and SRF), influence the formation of flower organs (sepals, petals,…

Pollen germinating on the carpel of thale cress (arabidopsis thaliana), observed using scanning electron microscopy at partial water vapour pressure (ESEM mode). Scientists are studying how certain transcription factors, particularly those in the MADS-box gene family (the MADS-box is a motif common to certain transcription factors, taking its name from the first four factors in which it was identified: MCM1, Agamous, Deficiens and SRF), influence the formation of flower organs (sepals, petals,…

Cauliflower observed using scanning electron microscopy. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. Here, we can see that the cauliflower's structure is made up of an abundance of young flower buds that are unable to differentiate themselves into flowers. They begin their development like flowers but fail to reach the final stage, instead continuing to proliferate as stalks. The cauliflower came about as the…

Thale cress (arabidopsis thaliana), observed using scanning electron micrsoscopy. These flowers are frequently described as cauliflower mutants. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. The cauliflower's structure consists of an abundance of young flower buds similar to those found tin hale cress, but which are unable to differentiate themselves into flowers. They begin their development like flowers but…

Thale cress (arabidopsis thaliana), observed using scanning electron micrsoscopy. These flowers are frequently described as cauliflower mutants. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. The cauliflower's structure consists of an abundance of young flower buds similar to those found tin hale cress, but which are unable to differentiate themselves into flowers. They begin their development like flowers but…

Thale cress (arabidopsis thaliana), observed using scanning electron micrsoscopy. These flowers are frequently described as cauliflower mutants. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. The cauliflower's structure consists of an abundance of young flower buds similar to those found tin hale cress, but which are unable to differentiate themselves into flowers. They begin their development like flowers but…

Thale cress (arabidopsis thaliana), observed using scanning electron micrsoscopy. These flowers are frequently described as cauliflower mutants. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. The cauliflower's structure consists of an abundance of young flower buds similar to those found tin hale cress, but which are unable to differentiate themselves into flowers. They begin their development like flowers but…

"Coccomyxa actinabiotis" micro-algae, which are resistant to radiation and heavy metals, observed by bright-field optical microscopy. This previously-unknown species was discovered in a nuclear reactor's spent fuel pool. This microscopic algae, which is exceptionally resistant to radiation, is able to overaccumulate toxic metals and radioactive compounds. Its discovery holds out the prospect of new bio-decontamination strategies for environmental and industrial applications.

Chloroplasts decorating cells in thale cress (arabidopisis thaliana), observed using confocal microscopy. Chloroplasts are where photosynthesis takes place. In a cell, chloroplasts appear green, but they also emit (by fluorescence) light in the red part of the spectrum. Here, scientists are studying the division of these cell organelles, which are found only in plants.

Cauliflower observed using scanning electron microscopy. Cauliflowers are the result of humans domesticating plants. Scientists want to understand how they adopt different morphologies. Here, we can see that the cauliflower's structure is made up of an abundance of young flower buds that are unable to differentiate themselves into flowers. They begin their development like flowers but fail to reach the final stage, instead continuing to proliferate as stalks. The cauliflower came about as the…