We examine questions about surgery on links which arise naturally from the trisection decomposition of 4-manifolds developed by Gay and Kirby \cite{G-K3}. These lie Heegaard surfaces in $\#^j S^1 \times S^2$ have surgeries yielding $\#^k S^2$. describe families such surgeries. One can ask whether all with these families; answer is almost certainly no. nevertheless give a small piece evidence fa...

Correspondence 2 . Mollica C , Paone G , Conti V , et al . Mechanical ventilation in patients with end-stage idiopathic pulmonary fi brosis . Respiration . In press . 3 . Fumeaux T , Rothmeier C , Jolliet P . Outcome of mechanical ventilation for acute respiratory failure in patients with pulmonary fi brosis . Intensive Care Med . 2001 ; 27 ( 12 ): 1868 1874 . 4 . Blivet S , Philit F , Sab JM ,...

3-80 ىدلما( 18.52 ± 35.61 رمعلا طسوتم ناك :جئاتنلا 92 ىضرلما نم ةئفلا يف روكذلا ددع ناكو .)تاونس نيذلا ىضرلما ناك .)25.2%( 31 ثانلإا ددعو ،)74.8%( )22.8%( 28 نأ ينح يف ،)77.2%( 95 لاصئتسلا اوعضخ اوعضخ نيذللا ىضرلما رمع طسوتم ناكو .علقلل اوعضخ مهنم رمع طسوتم نأ ينح يف ،13.08 ± 30.63 ينعلا نم ءزج ةلازلإ 23.92 ± 52.50 ناك ينعلا لماك ةلازلإ اوعضخ نيذللا ىضرلما ةمدص ببسب ينعلا رتبل ةدئارلا تارشؤلما ...

We study Dehn surgeries on null-homotopic knots that yield fibred 3-manifolds when an additional (but natural) homological restriction is imposed. The major tool used is Gabai’s theory of sutured manifold decomposition. Such surgeries are negative examples to a question of Michel Boileau. Another result we will prove is about surgeries which reduce the Thurston norm of a fibred manifold.

The concentrations of nitrous oxide were determined at various positions in four dental surgeries in which nitrous oxide sedation was used without scavenging. Contamination was present in all the surgeries, the greatest concentration being recorded at the dentist's nose and the least in the peripheral air. The reception area adjoining the surgeries was found also to be contaminated by nitrous o...

If we perform a non-trivial Dehn surgery on a hyperbolic knot in the 3-sphere, the result is usually a hyperbolic 3-manifold. However, there are exceptions: there are hyperbolic knots with surgeries that give lens spaces [1], small Seifert fiber spaces [2], [5], [7], [20], and toroidal manifolds, that is, manifolds containing (embedded) incompressible tori [6], [7]. In particular, Eudave-Muñoz ...

We show that if a knot admits a prime, twist-reduced diagram with at least 4 twist regions and at least 6 crossings per twist region, then every non-trivial Dehn filling of that knot is hyperbolike. A similar statement holds for links. We prove this using two arguments, one geometric and one combinatorial. The combinatorial argument further implies that every link with at least 2 twist regions ...