"" character (ANSI 177) and search engines

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I was looking up a chemical on Google:
and got a huge hit list of pages that had nothing to do with chemicals.
If I modify the query to:
resulting hit list contains pertinent pages, some even containing
Tried the same thing on AltaVista:
0 hits with the original query and similar results to Google when I removed
the "" character (ANSI 177).
Anybody know what's going on here?
Thanks, Mike

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