We investigate some combinatorial aspects of the “Pythagorean triple system”. Our motivation is the following question: Is it possible to color the naturals with finitely many colors so that no Pythagorean triple is monochromatic? This question is open even for two colors. A natural approach is to search for a nonbipartite triple system that can be realized as a family of Pythagorean triples. S...

Seven years' experience in prenatal screening for fetal chromosome aberrations in the west of Scotland is reviewed. Fetal chromosome analysis was undertaken in 716 pregnancies, 49% of which were judged to be at substantial risk of a fetal chromosome aberration. A chromosome aberration was found in 26 pregnancies, 14 of which were sufficiently severe to justify termination: the latter included n...

The author has published a necessary and sufficient condition for a fmite loopless graph to have a spanning subgraph with a specified positive valency at each vertex (see [8,9). In the present paper it is contended that the condition can be made more useful as a tool of graph theory by imposing a maximality condition. 1. The condition for an I-factor Let G be a finite graph. Loops and multiple ...

PURPOSE To present a unique case of a 58-year-old female with toxic anterior segment syndrome (TASS), following a triple procedure: Descemet's stripping automated endothelial keratoplasty (DSAEK), phacoemulsification and posterior chamber intraocular lens implantation. METHODS The patient was treated with topical dexamethasone sodium phosphate 0.1% and topical atropine sulfate 1%. Due to a sl...

Background: Scimitar syndrome (SS) or congenital pulmonary venolobar syndrome is a rare anomaly, most commonly including partial pulmonary venous drainage into the inferior vena cava, right lung hypoplasia, dextroposition of the heart, and anomalous systemic arterial supply from aorta or one of its branches to the right lung. Case report: A 10-day-old female infant was referred to our hospital...

The present study characterized the persistent changes (ie, off-treatment) resulting from short-term antihypertensive treatments on mean arterial pressure (MAP) and structurally based vascular resistance. Rats were treated for 14 days with enalapril (30 mg x kg(-1) x d(-1)) with regular (ENAL, 0.4%) or low salt (ELS, 0.04%) diets, or a triple therapy (Triple: hydralazine 45 mg x kg(-1) x d(-1),...

MONGOLISM was first described as a clinical entity and differentiated from cretinism by Langdon Down (1866). During the past few years there has been a revival of interest in the condition because of the discovery that the cells of patients with this anomaly contain an abnormal number of chromosomes. At the same time, keratoconus has been described by some European authors as one of the commone...