Why Climbers Die On Mount Everest
Researchers have conducted the first detailed analysis of deaths during expeditions to the summit of Mt. Everest. They found that most deaths occur during descents from the summit in the so-called "death zone" above 8,000 meters and also identified factors that appear to be associated with a greater risk of death, particularly symptoms of high-altitude cerebral edema.
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Cells are filled with membrane-bound organelles like the nucleus, mitochondria and endoplasmic reticula. Over the years, scientists have made much progress in understanding the biomolecular details of how these organelles function within cells, but understanding the actual physical forces that maintain the structures of these organelles' membranes continues to be a challenge. Mathematicians have recently devised a new mathematical procedure for accurately predicting the 3-D forces involved in creating and maintaining certain organelle membrane structures that could one day shed light on the lifecycle of membrane-bound viruses such as HIV.
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Scientists have identified a potential new avenue for altering lung development in the embryo which may help to improve the outcome for very premature babies. Researchers have discovered a key player in early lung development which is a potential drug target for treating very premature babies with small, immature lungs.
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Screening with an ultrasound machine has proved highly successful in preventing stroke among children with sickle cell disease, by identifying children who are then preventively treated with blood transfusions. Over an eight-year period at the Children's Hospital of Philadelphia, researchers found that the technique, transcranial Doppler ultrasonography, along with regular transfusions for children found to be at high risk, reduced stroke to one-tenth of the incidence found before TCD was introduced.
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Cells are filled with membrane-bound organelles like the nucleus, mitochondria and endoplasmic reticula. Over the years, scientists have made much progress in understanding the biomolecular details of how these organelles function within cells, but understanding the actual physical forces that maintain the structures of these organelles' membranes continues to be a challenge. Mathematicians have recently devised a new mathematical procedure for accurately predicting the 3-D forces involved in creating and maintaining certain organelle membrane structures that could one day shed light on the lifecycle of membrane-bound viruses such as HIV.
Scientists have identified a potential new avenue for altering lung development in the embryo which may help to improve the outcome for very premature babies. Researchers have discovered a key player in early lung development which is a potential drug target for treating very premature babies with small, immature lungs.
Screening with an ultrasound machine has proved highly successful in preventing stroke among children with sickle cell disease, by identifying children who are then preventively treated with blood transfusions. Over an eight-year period at the Children's Hospital of Philadelphia, researchers found that the technique, transcranial Doppler ultrasonography, along with regular transfusions for children found to be at high risk, reduced stroke to one-tenth of the incidence found before TCD was introduced.
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