RSS feed not feeding through to twitter

The problem is that this feed contains neither pubDates nor GUIDs - twitterfeed needs at least one of the two in order to determine which items are new (see http://twitterfeed.com/help#faq3)

Usually the best way is to use a RSS 2.0 or Atom feed format, which contain this information.

Also, not sure if this helps, but the feeds listed on this page seem to be mostly ok in terms of containing a pubDate: http://www.nature.com/webfeeds/index....