Push notifications are a way of getting alerted about new research. Rather than having to search for information, you can set up alerts that will automatically notify you when new material is published that meet your criteria. If you've ever used RSS feeds, you are already familiar with this concept: instead of visiting every website that you like, you can subscribe to the RSS feeds of your favorite sites, which will be aggregated into one place (your RSS reader) for your viewing pleasure.
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You can also get notifications from specific journal publications about newly published articles that meet your search criteria. Most journals allow you to sign up for notifications by visiting the journal page on the publisher's site.
If you see this icon , it mean that there is an RSS feed. An RSS feed allows you to aggregate content from a web resource (such as a blog, news site, or in this case, an online journal) so you don't have to visit every site that you are interested in keeping up with. For example, you could follow the RSS feeds from a couple of acupuncture blogs you like, get updates from Pubmed about all the new articles that have to do with acupuncture and pregnancy, and be sent the table of contents for each new issue of Fertility and Sterility. By using an RSS reader (such as Feedly, Instapaper, or Digg Reader), you can view all of this information in one place -- you don't have to just periodically check each of these different websites for updates. Instead, the updates come directly to you.