Statuts, ordonnances et règlemens de la communauté des maîtres rôtisseurs de la ville, fauxbourgs et banlieue de Paris. Du mois de juin 1744. Rédigés par M. l'abbé Mxxx [J.-B. Le Mascrier]...

[Acte. 1744-06-00]

Remontrances de l'université et de la ville de Paris à Charles VI sur le gouvernement du royaume, publié par H. Moranvillé

[Acte. 1380-1422 ?]

[Illustration de Nouvelle description de la ville de Constantinople] / [Non identifié]

Comprend : [Folio I] Vue de la ville et du port de Constantinople. [Cote : BNF C65845]

Are the light-harvesting I complexes from Rhodospirillum rubrum arranged around the reaction centre in a square geometry?

The basic photosynthetic unit containing the reaction centre and the light-harvesting I complex (RC-LHI) of the purple non-sulphur bacterium Rhodospirillum rubrum was purified and reconstituted into two-dimensional (2D) membrane crystals. Transmission electron microscopy using conventional techniques and cryoelectron microscopy of the purified single particles and of 2D crystals yielded a projection of the RC-LHI complex at a resolution of at least 1.6 nm. In this projection the LHI ring appears to have a square symmetry and packs in a square crystal lattice. The square geometry of the LHI ring was observed also in images of single isolated particles of the RC-LHI complex. However, although the LHI units are packed identically within the crystal lattice, a new rotational analysis developed here showed that the reaction centres take up one of four possible orientations within the ring. This fourfold disorder supports our interpretation of a square ring symmetry and suggests that a hitherto undetected component may be present within the photosynthetic unit.

Reliure de : Essai physico-géométrique, contenant : 1° la détermination du centre de gravité d'un secteur de cercle quelconque ; 2° la résolution géométrique du problème de la quadrature définie du cercle... par M. Le Rohberg-Herr de Vausenville,...

Numérisation partielle de reliure