Pacific salmon colonized the west coast of Canada following the last ice age (Groot and Margolis 1991) and are now found throughout British Columbia. British Columbia salmon have been harvested by members of the aboriginal community for several thousand years (Kew and Griggs 1991). More recently however, particularly over the last 125 years, salmon have also become the focus of intense commerci...

Nous montrons que I’ensemble des codes cycliques etendus primitifs, d’une longueur don&e, invariants sous le groupe affine (codes affines-invariants), peut etre identifi6 a I’ensemble des antichaines d’un certain produit de chaines. Nous proposons ainsi une classification de ce corpus de codes dont I’inttret principal est qu’une antichaine donnCe permet d’obtenir de nombreuses propriCtCs sur le...

Editors’ Note: Dr. Sethi discusses the disproportionate allocation of resources to neurologic diseases’ treatment compared to primary prevention. Focusing on the latter would do greater good for the greatest number of people. Dr. Silberberg agrees and mentions another study that supports this view. Dr. Beran criticizes Braley et al., pointing out that in their sleep-disordered breathing in mult...

We enumerate three classes of non-medial quasigroups of order 243 = 3 up to isomorphism. There are 17004 non-medial trimedial quasigroups of order 243 (extending the work of Kepka, Bénéteau and Lacaze), 92 non-medial distributive quasigroups of order 243 (extending the work of Kepka and Němec), and 6 non-medial distributive Mendelsohn quasigroups of order 243 (extending the work of Donovan, Gri...

Erratum Following the publication of the original article [1] it was brought to our attention that the collaborators from the PRIMUM Group were not correctly marked up as collaborating authors. This has now been corrected and all authors should be searchable in PubMed. The group consists of the following authors: Michael Beuhler; Rebecca Boland; Michael J. Bosse; Stephen Colucciello; Emily Gerk...

BACKGROUND Although the standard tracheostomy described in 1909 by Jackson has been extensively used in critical patients, a more simple procedure that can be performed at the bedside is needed. Since 1957 several different types of percutaneous tracheostomy technique have been described. The purpose of the present study was to compare two bedside percutaneous tracheostomy techniques: percutane...

A 4-cycle system is said to be diagonally switchable if each 4-cycle can be replaced by another 4-cycle obtained by replacing one pair of nonadjacent edges of the original 4-cycle by its diagonals so that the transformed set of 4-cycles forms another 4-cycle system. The existence of diagonally switchable 4-cycle system of Kv has already been solved [Adams, Bryant, Grannell and Griggs, Australas...