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The article presents a study which examines the quantitative changes, the pupal stage, and the metamorphosis of the silkworm Bombyx mori. The study uses the glycoside existing in low blood sugar values, the X-ray photographs of the pupal bodies, and the nuclear magnetic resonance (NMR). The study shows that the silkworm Bombyx mori identified an increase in glycoside, while the ammonia in the pupal bodies is caused by the y-cyclic di-L-glutamate and L-methionine.

The article describes the isolation of polar constituents of the pupae of the silkwork Bombyx mori in a diastereomic mixture of L(+)- and D(+)- methionine sulfoxide (MSO). According to the author, the L(+)-isomer of MSO was present in extracts of the first and fifth instar larvae, adults and eggs, but was not detected in feces or urine. The author adds that the D(+)-isomer was found only in pupal stage extracts and was excreted into the meconium with L(+)-isomer.