1) The influence of thyroid secretion upon the induction of leukemia in Dba/2 male mice by methylcholanthrene was investigated. Radiothyroidectomy significantly reduced the incidence of leukemia in these mice. This reduction in incidence did not occur if radiothyroidectomy was performed after the administration of the carcinogen. 2) Data indicated that hypothyroidism following radiothyroidectom...

PURPOSE The optic nerve (ON) sheath's role in limiting duction has been previously unappreciated. This study employed magnetic resonance imaging (MRI) to demonstrate this constraint on adduction. METHODS High-resolution, surface coil axial MRI was obtained in 11 normal adults, 14 subjects with esotropia (ET) having normal axial length (AL) < 25.8 mm, 13 myopic subjects with ET and mean AL 29....

The nearest neighbor search (NNS) problem is the following: Given a set of n pointsP = fp1; : : : ; png in some metric spaceX, preprocess P so as to efficiently answer queries which require finding a point in P closest to a query point q 2 X. The approximate nearest neighbor search (c-NNS) is a relaxation of NNS which allows to return any point within c times the distance to the nearest neighbo...

Sexual selection has had profound effects at the copulatory and postcopulatory levels, upon the evolution of reproductive anatomy, physiology, and patterns of mating behavior. This review deals with the effects of sexual selection upon the evolution of relative testes sizes, sperm morphology, seminal vesicular function, penile morphology, and copulatory behavior in the Order Primates. The conce...

L&#8217;Afrique offre la possibilit&#233; d&#8217;&#233;tudier les cons&#233;quences du choix entre une monnaie nationale et commune &#224; plusieurs &#201;tats. L&#8217;impact de ce sur r&#233;duction pauvret&#233; est l&#8217;objet cet article. A partir d&#8217;une analyse &#233;conom&#233;trique, utilisant base donn&#233;es PovcalNet Banque mondiale, l&#8217;article montre que l&#8217;&#233;...

134 The supraventricular (common narrow complex) tachycardias discussed so far have organized atrial activity (manifest by discrete P waves) and, with some notable exceptions, 1:1 atrioventricular (AV) con duction.* Atrial fibrillation (AF) and atrial flutter (AFL) are two related (and sometimes missed or mistaken) arrhythmias with very rapid atrial rates that greatly exceed the ventricular rat...

Economic evaluations of mining projects incorporate the examinination and assessment of the technical, financial, social and political aspects of the environment in which the mineral deposit is situated. This paper outlines some technical inputs that form the basis for financial evaluation. These include estimates of mineable ore, pro­ duction rates, performance of production systems, capital a...

A model system is described for examining the impact of bearing methylcholanthrene-induced tumors upon the van ous lymphoid cell subpopulations of mouse spleen and thy mus. The data define qualitative aspects of the 10-fold increase in numbers of spleen cells, and the equivalent re duction in thymus cells, during the 40to SO-day course of tumor bearing in CS7BL/6 or CBA mouse strains. The pro p...

There exist various tools for knowledge representation and modelling in artificial intelligence. We have designed and built a software tool called McESE (McMaster Expert System Environment) that comprises three such represen tations: pro duction systems, n eural nets, an d Petri nets. T he first two tools are alm ost com plemen tary in their strengths and weaknesses: neural nets are very good i...