BACKGROUND Penetrating injuries of the perineum are rare but very dangerous. Since the genitourinary and colorectal organs may be injured, how to evaluate surgical management of the injury is very important. METHODS The present report presents a case of penetrating injury of the perineum by a wooden stick when the patient fell on the upright wooden stick from a tree. The three feet long stick...

We have performed molecular dynamics simulations of solid-solid contacts lubricated by a model fluid displaying many of the properties of water, particularly its expansive freezing. Near the region where expansive freezing occurs, the lubricating film remains fluid, and the friction force decreases linearly as the shear velocity is reduced. No sign of stick-slip motion is observed, even at the ...

aims: needle stick accidents are a serious health risk for blood-borne infections among health care workers. this study was conducted to evaluate the frequency of needle stick injuries in health care workers and its related factors. instrument & methods: this cross-sectional study was carried on hcws of shahid beheshti hospital of kashan city, iran (270 individuals), from september 2013 to marc...