Reaction of the acyclic (diamino)carbene (ADC) :C(NiPr2)2 (1) with different dihaloboranes of the type RBX2 (R = Mes, Dur; X = Cl, Br) smoothly afforded a novel class of ADC-stabilized borane adducts. For MesBBr2 however, the reaction did not stop at the adduct level, but an uncommon rearrangement process occurred, which eventually resulted in the formation of a 5-membered boracycle after elimi...

we present a new renormalization-group calculation of the octagonal tiling excitation spectrum. Two new self-;imilar octagonal tilings are introduced, a triangle-Lite and a triangle-dan tiling, which are entangled with the standard rhombus-~quare tiling. The decimation procedure involved in the renormalization group calculation transforms each tiling enta a different one and goe; back tu the (r...

⁎ Corresponding author. Tel.: +33 6 32 33 62 70. E-mail address: [email protected] (P. Dur 1 Since the early 1980s, the term scenario has been c 2 Herman Kahn (1922–1983), was a physicist and m he co-directed the United States Air Force projects whi a global nuclear war. In 1961, Herman Kahn founded th one of the founders of futures studies, and contributed b The scenario methodwas descr...

BACKGROUND Holarrhena floribunda is a plant of wide usage in the Togolese folk medicine. A previous ethnobotanical survey on the latex plants of the Maritime region of the country revealed that this plant was included in several recipes curing malaria and microbial infections. Therefore, this study aimed to seek for the effectiveness of the ethanolic extract of the plant in the treatment of the...

Explorant les riches données longitudinales fournies par l’Observatoire de santé et population Niakhar, cette étude examine effets des migrations sur la mortalité infanto-juvénile dans familles rurales restées au village. Les migrations, en particulier courte durée, sont associées manière positive aux chances survie enfants moins cinq ans sein ...

Science serves its readers as a forum' for For the presentation and discussion of imporchemi4 tant issues related to the advancement of increa science, including the presentation of mias Ne nority or conflicting points of view, rather action than by publishing only material on which a consensus has been reached. Accordingly, are cc all articles published in Science-including higher editorials, ...

Gastric cancer is one of the most commonly occurring malignant cancers in the world. Dur‐ ing the second half of the 20th century a drastic rise has been observed in the number of cases and deaths caused by this cancer. Gastric cancer is the second, after pulmonary cancer, cause of death due to malignant cancers in the world. There is a geographic diversification in the occurrence of gastric ca...

Delayed dehiscence of a previously repaired bladder rupture in a 12-year-old boy is descr ibed. There was no obvious cause except that while in bed the boy had withheld his ear ly morning urge to pass urine. He presented with peritonitis and raised urea and creatinine levels. Retrograde cystography was diagnostic after the urinary catheter had drained 1.2 litres of blood-tinged urine. The rent ...

THE UTILIZATION dur ing starvation of the nutrient reserves in the gut of a temperate water sea urchin , Strongylocentrotus purpuratus, was measured by Lawrence et al. (1966) . There have been no investigations of the utilization of reserves in the gut of tropical urchins, although the level of reserves in the gut of several tropical species has been reported (Giese et al., 1964; Lawrence, 1967...

A Knowledge Engineering System for MEDAS p. 6 Knowledge Acquisition for Computer-Based Medical Expert Systems p. 12 A Complete, Hypermedia Medical Decision Analysis Support System p. 16 3-D Motion Estimation Algorithms Using 4-D Data p. 22 Edge Detection in Gated Cardiac Nuclear Medicine Images p. 28 Edge Detection Using the Local Fractal Dimension p. 34 Model-Based Analysis of Cardiac Motion f...