Wound dressings history

PoIy(N-vinylpyrrolidinone) (PNVP) has been used in medical applications for many years. Its history can be traced back to the Second World War where in its un-crosslinked form it was used as a blood plasma expander (I). This un-crosslinked PNVP when added to iodine forms a complex, in solution this complex is better known as Povidone-iodine or by its trade name Betadine , a surgical antiseptic. PNVP is also used as a binder in many pharmaceutical tablets as low molecular weight PNVP can be removed from the body by the kidneys. These polymers have also been investigated for use as wound dressings, drug... 

Is it possible to take hydrocarbons straight out of the ground and use them as they are Since the earliest recorded history, people have done just that. In the past, people used crude oil that seeped up to Earth s surface to waterproof boats and buildings. They also used it to grease wheels and even dress the wounds of animals and humans. As well, people burned natural gas, mainly to supply lighting for temples and palaces. 

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