Altitude illness in Qinghai–Tibet railroad passengers.

It takes ≈24 h to travel the ≈3000-km-long Qinghai–Tibet railroad of which 85% is situated above 4000 m with a pass at 5072 m. Each year about 2 million passengers are rapidly exposed to high altitude traveling on this train. The aim of this study was to quantify the occurrence of altitude illness on the train.

Uptake and transport of calcium in plants.

Recently, research on Ca(2+) transport in plants has been focused on cellular and molecular level. But the uptake, transport and distribution are also very important for calcium to accomplish its function at whole plant level. There are many cells along the way of transport of Ca(2+) from root to shoot, and Ca(2+) passes either through the cytoplasm of cells linked by plasmodesmata (the symplast) or through the spaces between cells (the apoplast), which include Ca(2+) uptake by root cells, Ca(2+) transport from root cortex to and through the xylem, and then out of it into leaves or fruits.