Solar Wind-Induced Atmospheric Erosion at Mars: First Results from ASPERA-3 on Mars Express

The Analyzer of Space Plasma and Energetic Atoms (ASPERA) on board the Mars Express spacecraft found that solar wind plasma and accelerated ionospheric ions may be observed all the way down to the Mars Express pericenter of 270 kilometers above the dayside planetary surface. This is very deep in the ionosphere, implying direct exposure of the martian topside atmosphere to solar wind plasma forcing. The low-altitude penetration of solar wind plasma and the energization of ionospheric plasma may be due to solar wind irregularities or perturbations, to magnetic anomalies at Mars, or both.

The efficacy of tepid sponge bathing to reduce fever in young children

Tepid sponge baths distress febrile children, and their efficacy at reducing fever has not been established. This study compared fever reduction and with (1) acetaminophen alone and (2) acetaminophen plus a 15-minute tepid sponge bath. Twenty children, ages 5 to 68 months, who presented to the emergency department or urgent care center with fever of > or = 38.9 degrees C were randomized to receive (1) acetaminophen alone or (2) acetaminophen plus a 15-minute tepid sponge bath. All subjects received a 15-mg/kg dose of acetaminophen. Tympanic temperature was monitored every 30 minutes for 2 hours. Subjects were monitored for signs of discomfort (crying, shivering, goosebumps). Sponge-bathed subjects cooled faster during the first hour but there was no significant temperature difference between the groups over the 2-hour study period (P = .871). Subjects in the sponge bath group had significantly higher discomfort scores (P = .009).

Oxygen radicals and calcium ion flux: role in reperfusion injury following AMI

Occlusion of coronary vessels is now frequently treated by reperfusion using thrombolytics, angioplasty, or coronary artery bypass surgery. On reperfusion, however, acutely ischemic cells may be damaged by the action of oxygen radicals on cell membranes, and by calcium ion flux. By understanding the mechanisms behind reperfusion injury, the critical care nurse can assess and plan for actual and potential patient care problems.