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Amazon websites are country-specific (for example, amazon.com for the US and amazon.co.uk for UK) though some offer international shipping. [49] Visits to amazon.com grew from 615 million annual visitors in 2008, [50] to more than 2 billion per month in 2022. [citation needed] The e-commerce platform is the 14th most visited website in the ...
In the 1940s, a vial of 5,000 Oxford units was standard, [24] but the depending on the batch, could contain anything from 15 mg to 20 mg of penicillin. Later, a vial of 1,000,000 international units became standard, and this could contain 2.5 g to 3 g of natural penicillin (a mixture of penicillin I, II, III, and IV and natural impurities).
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