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  2. Polyethylene - Wikipedia

    en.wikipedia.org/wiki/Polyethylene

    Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.

  3. Avascular necrosis - Wikipedia

    en.wikipedia.org/wiki/Avascular_necrosis

    Doctors discovered Jackson to have lost all of the cartilage supporting his hip while he was undergoing tests following a hip-injury he had on the field during a 1991 NFL Playoff game. [29] Avascular necrosis of the hip was also identified in a routine medical check-up on quarterback Brett Favre following his trade to the Green Bay Packers in ...

  4. Safety of magnetic resonance imaging - Wikipedia

    en.wikipedia.org/wiki/Safety_of_magnetic...

    All patients are reviewed for contraindications prior to MRI scanning. Medical devices and implants are categorized as MR Safe, MR Conditional or MR Unsafe: [6] MR-Safe – The device or implant is completely non-magnetic, non-electrically conductive, and non-RF reactive, eliminating all of the primary potential threats during an MRI procedure.

  5. Mil Mi-17 - Wikipedia

    en.wikipedia.org/wiki/Mil_Mi-17

    The Mil Mi-17 (NATO reporting name: Hip) is a Soviet-designed Russian military helicopter family introduced in 1975 (Mi-8M), continuing in production as of 2024 ...

  6. List of recipients of the George Medal, 1990s–2010s - Wikipedia

    en.wikipedia.org/wiki/List_of_recipients_of_the...

    Where a recipient has received a second GM, a picture of the ribbon bearing the bar symbol is shown. In December 1977 the provisions for the medal were altered, allowing it to be awarded posthumously, [ 1 ] in which case the "†" symbol appears next to the recipient's name.

  7. Dynamic hip screw - Wikipedia

    en.wikipedia.org/wiki/Dynamic_hip_screw

    Dynamic hip screw [ citation needed ] It is the most commonly used implant for extracapsular fractures of the hip, [ 1 ] which are common in older osteoporotic patients. There are 3 components of a dynamic hip screw, including a lag screw (inserted into the neck of the femur), a sideplate and several cortical screws (fixated into the proximal ...

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