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The general advice is for we to be as much specific as possible. So won't it be confusing a blog about cooking and computer mixed ?

Nope the meta tag http-equiv won't be usefull. If your page has definitely moved to portal.ufam.edu.br, you should clearly implement a 301 redirection to it, and not use the HTTP-EQUIV meta tag (which is not interpreted by search engines). With a 301 redirection, you will tell to search engines to reassign the linkjuice of any backlink pointing to www.ufam.edu.br to the new portal.ufam.edu.br URL. I recommend you reading this articles: http://www.seomoz.org/blog/url-rewrites-and-301-redirects-how-does-it-all-work http://www.seomoz.org/blog/301-redirect-or-relcanonical-which-one-should-you-use J.