These findings show that Amazon's cloud computing infrastructure may be a useful alternative to using clusters of computers based within a research institute or university.
For example, an introductory laboratory unit using neuroimaging software may be a useful alternative to oral presentations by students.
She said: "Some people may not have large enough spaces in between their teeth to use an inter-dental brush, so flossing can be a useful alternative.
We also believe that the use of planning districts or councilmatic districts may be a useful alternative to census tracts.
David Goodwillie of Blackburn Rovers would be a useful alternative if Wayne Rooney is tired after the European Championship.
Clicking on the icon opens an instant chat session, which can be a useful alternative to successive volleys of e-mail.
If any of the official websites are down, the ABC's emergency coverage page and Twitter feed can be a useful alternative.
In selected situations, a device known as a personal sound amplifying product, or P.S.A.P., can be a useful alternative, experts say — with some caveats.
Besides testing, also modelling might be a useful alternative.
If all the parties agree, this can often prove to be a useful alternative.
MRI may be a useful alternative to CT in hybrid PET imaging.
