Theoretical study of the Tetraaminelithium and Tetraaminesodium molecules complexed with H, Li and Na anions: static and dynamic NLO parameters.

Context: This work focuses on the study of six molecules composed of the TetraAmineLithium (TALi) and TetraAmineSodium (TANa) structures linked with the anions H, Li and Na. The NLO results obtained by these calculations showed significant values of static first hyperpolarizabilities (β) ranging from 8.74 * 10 to 691.

Characteristics of new pyrrolic derivatives and their oligomers using DFT and TD-DFT calculations.

Context: This article is based on the study of pyrrolic derivatives and their oligomers. Knowing that, pyrrolic derivatives are widely studied on an industrial scale. The aim of this work is to find pyrrolic derivatives having the same physicochemical characteristics such as the pyrrolic edifice.

A structural DFT study of MM, GG, MG, and GM alginic acid disaccharides and reactivity of the MG metallic complexes.

The density functional theory method using the B3LYP/6-31G(d,p) level of theory was used to perform isoenergetic maps in order to determine the lower energy conformers of four disaccharides constituting alginic acids, which are based on β-D-mannuronic (M) and α-L-guluronic acid (G), called MM, GG, MG, and GM. The preferred structures are combined to monovalent (Li, Na, and K) cations and further fully optimized, and an isoenergetic map corresponding to the complex (MG, 2Na) was performed. Then, the reactivity of MG complexes with mono- and bivalent cations was studied using the global nucleophilic index.

Automated assessment of diabetic retinopathy severity using content-based image retrieval in multimodal fundus photographs.

Purpose: Recent studies on diabetic retinopathy (DR) screening in fundus photographs suggest that disagreements between algorithms and clinicians are now comparable to disagreements among clinicians. The purpose of this study is to (1) determine whether this observation also holds for automated DR severity assessment algorithms, and (2) show the interest of such algorithms in clinical practice.

Methods: A dataset of 85 consecutive DR examinations (168 eyes, 1176 multimodal eye fundus photographs) was collected at Brest University Hospital (Brest, France).

Medical case retrieval from a committee of decision trees.

A novel content-based information retrieval framework, designed to cover several medical applications, is presented in this paper. The presented framework allows the retrieval of possibly incomplete medical cases consisting of several images together with semantic information. It relies on a committee of decision trees, decision support tools well suited to process this type of information.

Multimedia medical case retrieval using decision trees.

In this paper, we present a Case Based Reasoning (CBR) system for the retrieval of medical cases made up of a series of images with contextual information (such as the patient age, sex and medical history). Indeed, medical experts generally need varied sources of information (which might be incomplete) to diagnose a pathology. Consequently, we derive a retrieval framework from decision trees, which are well suited to process heterogeneous and incomplete information.

Content based image retrieval based on wavelet transform coefficients distribution.

In this paper we propose a content based image retrieval method for diagnosis aid in medical fields. We characterize images without extracting significant features by using distribution of coefficients obtained by building signatures from the distribution of wavelet transform. The research is carried out by computing signature distances between the query and database images.

[Deep lamellar keratoplasty versus penetrating keratoplasty for keratoconus].

Objective: To determine the advantages, safety, and accuracy of deep anterior lamellar keratoplasty (DLK) versus penetrating keratoplasty (PK) in terms of visual acuity, astigmatism, and endothelial preservation in corneal diseases with healthy endothelium. Of these candidates for keratoplasty, the study investigated keratoconus patients with no other ophthalmic abnormalities.

Materials And Methods: This comparative nonrandomized retrospective study investigated 22 patients with keratoconus requiring surgery, who underwent keratoplasty in the Nantes University Hospital between 1 June 2002 and 1 January 2004.

[Endoscopic exploration of the small intestine].

The development of Japanese enteroscopes, mot of which are still prototypes, has made it possible to explore the entire small bowel. These instruments are either introduced into the jejunum like an ordinary endoscope, or pushed along a guidewire, or weighted with mercury, like a Miller-Abbott probe. A simplified study of the adult malabsorption syndrome can be performed by proximal jejunoscopy, usually carried out in Europe with a paediatric colonoscope.