Heroes and heroic life in the Iliad and Akritic folk-song

Thesis (M.A) -- University of Adelaide, Dept. of Classics, 199

Akritic folksong and Digenis Akritis: central king and peripheral hero?

In this paper I will attempt to apply the geometrical schema of centre and periphery to the essential relationship between king and hero in Akritic folksong and the Byzantine epic Digenis Akritis. For this purpose, from the cycle of Akritic songs I will refer mainly to the Song of the Son of Andronikos, the three versions of the Song of Porphyris,the Song of Theophylaktos and the Song of Digenis and the Crab all found in the collection of Petropoulos (Petropoulos, 1958: 36-40,43- 8, 51-3, 16-19). As far as the Byzantine epic is concerned, I will consider mainly the version  ontained in the Grottaferrata manuscript (Mavrogordato, 1956), though I also refer to the Escorial version (Ricks, 1990). I will, however, extend my comparison to the firstheroic epic, the Iliad, which originally provoked and channelled my inquiry, and I will use this as a gnomon for my discussion

Transferring the emergence profile from the provisional to the final restoration

In implant restorations, the ability to manage the response of soft tissue properly and achieve a proper emergence profile is a primary goal for the clinician. The desirable emergence profile can be formed by the use of the provisional restorations. Once this task is achieved, the soft tissue contour must be transferred accurately to the final restoration. In this technique article, four different methods are presented for transferring the emergence profile: the modification of the impression post by adding composite resin intraorally or extraorally, the fabrication of a working cast mimicking the soft tissue contour, and the use of CAD/CAM technology. Each technique presents certain advantages and disadvantages. The choice, therefore, relies on the clinician's judgment depending on the available materials, time, and familiarization with the necessary steps. The aim of this technique article is to describe, evaluate, and compare with the use of clinical examples these four techniques presented for the transfer of the emergence profile from the provisional to the final restoration. Clinical Significance The application of these simple, yet important, techniques can not only help achieve optimal esthetics but also contribute to the maintenance of peri-implant health. Especially in esthetically demanding cases - such as in implant restorations in the anterior area or in cases with high lip line - their application can lead to a more predictable final result. © 2013 Wiley Periodicals, Inc

Photosystem II and photosynthetic oxidation of water: an overview.

Conceptually, photosystem II, the oxygen-evolving enzyme, can be divided into two parts: the photochemical part and the catalytic part. The photochemical part contains the ultra-fast and ultra-efficient light-induced charge separation and stabilization steps that occur when light is absorbed by chlorophyll. The catalytic part, where water is oxidized, involves a cluster of Mn ions close to a redox-active tyrosine residue. Our current understanding of the catalytic mechanism is mainly based on spectroscopic studies. Here, we present an overview of the current state of knowledge of photosystem II, attempting to delineate the open questions and the directions of current research