51�Թ�

The simulated altitude was created in what is known as hypoxic tents from which oxygen is sucked out using a generator, bringing it to levels present at high mountain altitudes.

Adrian Ballinger, who heads another expedition team climbing Everest from the Chinese side to the north, also makes his clients undergo pre-acclimatisation training like using hypoxic tents to shorten time on the mountains.

He was diagnosed with a hypoxic brain injury, meaning his brain was starved of oxygen, and four-limb dystonia, which can lead to uncontrolled spasms in his arms and legs.

Her primary cause of death being given as an hypoxic brain injury, which is caused by a lack of oxygen.

The authors add, "Pathogenic mycobacteria, like those causing the human diseases leprosy and tuberculosis, are found in abundance in sphagnum peat bogs where the acidic, hypoxic and nutrient-poor environment gives rise to fierce microbial competition. We isolated fungi from such bogs and screened for those that competed directly with mycobacteria by co-culture and discovered that these fungi all target the same physiological process in mycobacteria using several chemically distinct mechanisms."