Direction and magnitude of natural selection on body size differ among age-classes of seaward-migrating Pacific salmon.

Due to the mediating role of body size in determining fitness, the "bigger-is-better" hypothesis still pervades evolutionary ecology despite evidence that natural selection on phenotypic traits varies in time and space. For Pacific salmon (genus ), most individual studies quantify selection across a narrow range of sizes and ages; therefore, uncertainties remain concerning how selection on size may differ among diverse life histories. Here, we quantify the direction and magnitude of natural selection on body size among age-classes of multiple marine cohorts of (sockeye salmon).

Angiocentric T-cell lymphoma of the tonsil: a case report.

We present a case of an angiocentric T-cell lymphoma (ACTL) occurring in a 31-year-old woman with the Acquired Immunodeficiency Syndrome (AIDS). This patient had oropharyngeal pain, a non-healing superficially ulcerated right tonsil, and no obvious tumor mass. Initial tonsillar biopsy revealed a subtle, non-specific, perivascular lymphocytic infiltrate subjacent to an ulcerated and inflamed mucosal lining.