The ninhydrin reaction, one of the most important method of detecting amino acids, both technically and historically, has been conventionally used to detect their microgram amounts. When amino acids with a free alpha amino groups are treated with an excess of ninhydrin, they yield a purple colored product.
Update January 19: Amazon has increased the monthly price of Amazon Prime from $10.99 to $12.99 for those who opt for the month-to-month plan. However, the annual price remains untouched at $99 per year, which makes it the better option for avid Amazon shoppers.
Netflix charges a monthly fee of $7.99 per month, which comes out to $95.88 per year. Amazon Prime costs $99 per year, which comes out to about $8.25 per month. Forgetting the nice shipping benefits you get with Prime, you pay about the same.If both services had the same library of options, you could justify a Prime membership in an instant.n the end, you'll find the service worth it if either benefit proves even remotely useful to you. Let's break down both services to get a more specific idea of what $99 per year gets you. Update: Amazon Prime, which used to be $79 a year, has gone up to $99 a year.