Using modern platelet aggregometers, it is possible to evaluate platelet secretion simultaneously, by measuring release of ATP by the aggregating platelets. Measurement of platelet secretion allows the laboratory diagnosis of secretion defects with greater sensitivity than platelet aggregation testing alone.
Windows XP has long been an OS Microsoft begrudgingly kept alive far longer than it could have ever imagined. Initially released in 2001, official support for Windows XP persisted all the way through April 2014. At the time, Microsoft noted that after 13 years of support, it was time for the company to look forward, unencumbered by outdated software.
There are two primary reasons why Microsoft had to extend XP support: 1  Vista was delivered 4 years late and has been slammed by the press and users alike. Many private users and corporations continue to use XP and install the free OS downgrade option on new PCs. 2  The rise of low-specification netbooks.