Les mélanines sont une large classe de biopolymères responsables de la pigmentation chez l’homme.

A major challenge for the study of laser-matter interactions at ultrahigh intensity is to find simple methods both to control these interactions, and to characterize them on very small spatial scales (micron) and temporal (femtosecond to attosecond).

One of the goals in physical chemistry is to follow reaction paths in details.

Motions of the carbonyl group of the Photoactive Yellow Protein (PYP) chromophore have been investigated, for the first time, by femtosecond time-resolved circular dichroism (tr-CD) spectroscopy, in the near-ultraviolet spectral region.

Le transport et la distribution de médicaments dans l’organisme sont des mécanismes complexes régis par de nombreux processus différents.

Many complex molecular systems absorb light in the UV spectral range, including those of paramount biological importance, like DNA bases or proteins.

Ionized molecules are involved in many chemical reactions, and participate for an important part in the chemistry of the upper atmosphere and interstellar clouds.

The description of the interactions controlling the shape of a protein is crucial in understanding the cellular mechanisms, but is still difficult to achieve on biological systems because of their complexity.

A decade after their first synthesis in the laboratory, carpets of aligned carbon nanotubes (CNTs) are being considered in many fields of applications (filtration membranes, passive and active electronic components, composite materials,.

Les irradiations aux rayons ultra-violets A (UVA) sont connues pour être à l'origine de cancers de la peau.

By comparison with experimental data obtained specifically for this purpose by scientists of IRAMIS / SPAM, it is possible to select the best ab initio method able to give the parameters of "force field" models to faithfully reproduce the structure of assemblies of atoms, as complex as proteins (macromolecule composed of amino acids) or peptides (small polymers of amino acids, n <50).

Clusters consists in a set of several up to million atoms in condensed phase with nanometric finite size.

One of the great mysteries of life is its lack of symmetry at the molecular scale.

The very new laser of the "Plateforme Laser Femtoseconde Accordable, PLFA" began to be installed last year within the Service of Photons Atoms and Molecules (SPAM).

Laboratoire Francis Perrin, CEA/ DSM/DRECAM/SPAM-CNRS URA 2453 F-91191 Gif-sur-Yvette, France Tous les médecins nous mettent en garde contre les expositions sans protection au soleil pouvant provoquer coups de soleil, mais aussi à long terme, cancers de la peau.

SPAM / Lab.