Acknowledging funding I often read in research articles acknowledgments such as


  The first author is (partially) supported by a grant of the National Science Foundation of Sikinia no. 1234567890.


What are the guidelines for acknowledging funding agencies? Should I mention, for instance, grants that cover some research expenses or sponsor my participation to a conference? Or only those who pay me directly?
The general rule I recommend is extremely liberal: If you write or publish a paper while being funded by a grant in any capacity whatsoever, acknowledge the grant.  ("Work by this author was partially supported by...")

When in doubt, say thank you.