Le pape saint Gélase Ier (492-496) étude sur sa vie et ses écrits /

Includes bibliographical references and index.

A life of Pope St. Gregory the Great, written by a monk of the monastery of Whitby (probably about A.D. 713) Now for the first time fully printed from ms. Gallen, 567,

Latin text (46 p.) has caption title: Vita beatissimi papae Gregorii magni antiquissima.

Anisotropy of spin relaxation of water protons in cartilage and tendon

Transverse spin relaxation rates of water protons in articular cartilage and tendon depend on the orientation of the tissue relative to the applied static magnetic field. This complicates the interpretation of magnetic resonance images of these tissues. At the same time, relaxation data can provide information about their organisation and microstructure. We present a theoretical analysis of the anisotropy of spin relaxation of water protons observed in fully hydrated cartilage. We demonstrate that the anisotropy of transverse relaxation is due almost entirely to intramolecular dipolar coupling modulated by a specific mode of slow molecular motion: the diffusion of water molecules in the hydration shell of a collagen fibre around the fibre, such that the molecular director remains perpendicular to the fibre. The theoretical anisotropy arising from this mechanism follows the “magic-angle” dependence observed in magnetic-resonance measurements of cartilage and tendon and is in good agreement with the available experimental results. We discuss the implications of the theoretical findings for MRI of ordered collagenous tissues.

Digital processing of diffusion-tensor images of avascular tissues

Diffusion is the process that leads to the mixing of substances as a result of spontaneous and random thermal motion of individual atoms and molecules. It was first detected by the English botanist Robert Brown in 1827, and the phenomenon became known as ‘Brownian motion’. More specifically, the motion observed by Brown was translational diffusion – thermal motion resulting in random variations of the position of a molecule. This type of motion was given a correct theoretical interpretation in 1905 by Albert Einstein, who derived the relationship between temperature, the viscosity of the medium, the size of the diffusing molecule, and its diffusion coefficient. It is translational diffusion that is indirectly observed in MR diffusion-tensor imaging (DTI). The relationship obtained by Einstein provides the physical basis for using translational diffusion to probe the microscopic environment surrounding the molecule.

Règle pastorale /

Text in Latin and French on opposite pages, introductory matter in French.

Catalogo sommario della esposizione gregoriana aperta nella Biblioteca apostolica vaticana dal 7 all'11 aprile 1904 /

Mode of access: Internet.

Morales sur Job /

Vol. 1 has also been published in a 2nd ed., 1975, and a 3rd ed., 1989.

Commentaire sur le Premier Livre des Rois /

Latin text, with French translation; editorial matter in French.

Registre des lettres /

Includes bibliographical references (v. 1, pt. 1, p. [63]-67) and indexes.

Sermons /

Mode of access: Internet.

Homélies sur l'évangile /

Includes indexes.

Sermons /

Latin text and French translation of Sermones.

Gregory the Great, his place in history and thought /

Includes bibliographical references (v. 1, p. viii-xv) and indexes.

Atti del martiio di S. Alesandro Primo, e memorie del suo sepolcro della via Nomentana.

Mode of access: Internet.

S. Gregorii Magni Moralia in Job /

Includes bibliographical references.