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Paroxysmal nocturnal hemoglobinuria ( PNH) is a rare, acquired, [ 1] life-threatening disease of the blood characterized by destruction of red blood cells by the complement system, a part of the body's innate immune system. This destructive process occurs due to deficiency of the red blood cell surface protein DAF, which normally inhibits such ...
Men's pole vault world record progression. The first world record in the men's pole vault was recognized by the International Association of Athletics Federations in 1912. [ 1] As of June 21, 2009, 71 world records have been ratified by the IAAF (now World Athletics) in the event. Since 2000, World Athletics makes no distinction between indoor ...
Updated on March 2023. Holly Bethan Bradshaw (née Bleasdale, born 2 November 1991) is an English track and field athlete who specialises in the pole vault. She used to be the British record holder in the event indoors and outdoors, with clearances of 4.87 metres (2012 indoors) and 4.90 metres (2021 outdoors). Bradshaw won a bronze medal at the ...
A geomagnetic reversal is a change in a planet's dipole magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south ). The Earth's magnetic field has alternated between periods of normal polarity, in which the predominant direction of the field was ...
Even without that ability, Anchor Point is a handy tool for adventures and travelers. Currently the app is only $1.99 in the iTunes Store. That's a small price to pay for such a useful exploration ...
Jack Guy, CNN. July 22, 2024 at 6:53 AM. Theros Sailing Adventure/Facebook. A British-Canadian couple who were attempting to sail across the Atlantic have been found dead on an island off the east ...
Walking stick. A walking stick (also known as a walking cane, cane, walking staff, or staff) is a device used primarily to aid walking, provide postural stability or support, or assist in maintaining a good posture. Some designs also serve as a fashion accessory, or are used for self-defense . Walking sticks come in many shapes and sizes and ...
Shelter-half. A shelter-half is a simple kind of partial tent designed to provide temporary shelter and concealment when combined with one or more sections. Two sheets of canvas or a similar material (the halves) are fastened together with snaps, straps or buttons to form a larger surface. The shelter-half is then erected using poles, ropes ...