A method and a prism for improving illumination efficiency in an optical projection system are disclosed. The acquisition signals are encoded in a specific acquisition code that differs from the CDMA communication code of the information signals. Use of the data structure provides users with an easy-to-use interface. The compounds tested for topoisomerase I inhibition is described. A flow rate of clean gas introduced into a container potion 10 is limited to thereby prevent the outermost layer of a glass particle deposit 20 from being locally cooled and reduce variation in bulk density in the longitudinal direction of the glass particle deposit 20, that is, outer diameter variation and breakage.