不吐糸蚕(繭を作らない蚕)血液の レオロジー特性 [in Japanese] Rheologic Characteristics Of Blood From Non-Cocooning Silkworm(Bombyx mori)Bred With Artificial Breeding [in Japanese]
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We previously found that the rheologic characteristics of blood from silkworms bred by artifi breeding change with the age of the silkworm. We have investigated here, the rheologic characteristics of blood from non-cocooning (non-throwing up) silkworms bred by artificial breeding. Blood from artificial breeding silkworms showed non-Newtonian plastic flow with yield stress at a shear rate below 10s<SUP>-1</SUP>, thereby suggesting that the blood has a kind of structure arising from the interaction of blood constituents. Detailed rheologic analyses were performed using Casson's equation. Blood from normal, cocooning silkworms revealed a marked decrease in fluidity at the last stage of five age periods; for example, Casson's yield stress was 1.04×10<SUP>-2</SUP> Pa and Casson's viscosity of it was 2.22×10<SUP>-3</SUP> Pa·s. However, blood from non-cocooning silkworm did not show such a decrease in fluidity; for example, Casson's yield stress was 0.01×10<SUP>-2</SUP> Pa and Casson's viscosity of it was 0.07×10<SUP>-3</SUP> Pa·s. These results clearly show that the rheologic characteristics of silkworm blood and accordingly the structure of blood, are strongly related to the non-cocooning phenomenon of silkworms These findings could be useful in quantitative investigation of the physiological process in silkworms.
- Journal of Japanese Society of Biorheology
Journal of Japanese Society of Biorheology 14(3), 99-105, 2000-09-30
JAPANESE SOCIETY OF BIORHEOLOGY