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A practical method for collecting, storing, and transporting liquid biological samples in a dry state for subsequent hormone metabolite analyses is presented. This method employs the use of ordinary filter paper strips that imbibe liquid samples. Samples taken up by the filter paper were allowed to
I3Ia;. 31. 1921. ndding osygeii (\vliicli does n o t comc into contnct with t h o c:itnlyst) (D.R.1'. 359,870 of 1911) or by c1cctric:il hentiiig (U.S.P. l,LWZ,9?5 of 1016). All iron cntcilyst wit11 :L proiiiotcr (possibly riiolybdeiiuni) is used (D.11.P. ?G5,295 of 1912; u.s.1'. 1,185,530 of 1910).
## Abstract The outputs of several information filtering (IF) systems can be combined to improve filtering performance. In this article the authors propose and explore a framework based on the soβcalled information structure (IS) model, which is frequently used in Information Economics, for combini