Changes in respiratory activity and utilization of reserves during the pharate fifth larval instarof the silkworm, Bombyx mori L.
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The course of respiration of a larva during the pharate fifth larval instar can be conveniently divided into four phases. The increase in the respiration rate in the first 12h after the fourth apolysis (Phase a) may be related to the biosynthetic activities. The decrease in the respiration rate from the 12th h to the 24th h after the fourth apolysis (Phase b) might reflect the degradation of tissues of the fourth instar larva. The increase in the respiration rate from the 36th h to the 48th h (Phase d) might be related to the formation of new tissues of the fifth instar larva. Larvae fed on no food from the 24th h to the 48th h after the fourth apolysis (Phase c and d). The main fuels of respiration in Phase c were nitrogen compounds contained in the hemolymph and lipids in the perivisceral fat body. On the other hand, in Phase d lipids contained in the body wall and perivisceral fat body were the main fuels. The chitin content of the old cuticle remained in the body was sufficient to supply that of the new fifth instar cuticle.
- 社団法人 日本蚕糸学会の論文
社団法人 日本蚕糸学会 | 論文
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