Introduced species and infectious diseases both independently pose challenges for the preservation of existing biodiversity. However, native species or disease hosts are by no means 'unarmed' when faced with novel environmental challenges, provided that adequate adaptive genetic variation exists to mount effective evolutionary responses. In this study, we examined the consequences of the recent...

Host biodiversity can impact disease risk and influence the transmission of parasitic disease. Stream sediment-dwelling worms, Tubifex tubifex (Clitellata: Oligochaeta), are the definitive host of the parasite Myxobolus cerebralis (Myxozoa: Myxosporea), which causes whirling disease in salmonid fishes. Genetic diversity of T. tubifex is correlated with host susceptibility to M. cerebralis , and...

This study has investigated the influence of journal bearing wear on dynamic behaviour a flexible rotor with central disc. Rotors supported bearings are susceptible to self-excited whirling, leading unstable conditions. Prior knowledge stability limit speed is important avoid excessive vibration rotating machines. For in this paper, were lubricated powder owing high-temperature applications whe...

A 42-year-old male presented to the Emergency Department complaining of right lower quadrant pain of 2 days duration. He had no previous surgical history. On physical exam, the patient was afebrile with diffuse abdominal tenderness and peritoneal irritation. White blood cell, electrolytes, amylase and lipase serum levels were normal. A contrast-enhanced CT scan of the abdomen and pelvis (Pictur...

We exposed 9 wk old rainbow trout Oncorhynchus mykiss to ambient levels of Myxobolus cerebralis infectious stages at 4 sites of suspected differing infectivity in the Colorado River. Exposure was estimated by periodic filtration of river water at each exposure location. After a 32 d exposure, the fish were held in the Colorado River at a common site for over a year. Resulting infection was eval...