菌糸塊状発育菌体に対する攪拌効果

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By using two species of molds, Lentinus edodes and Aspergillus niger, the influence of agitation on disruption of the mycelial pellets were studied with a conventional stirring tank. Consequently, the physical effects of agitation on the mycelial pellets were classified in two types. One of these types is the decrease in diameter of the pellet by chiping off pellicles from the surface of pellets, and the other type is the direct rupture of the spherical shape of pellets, in the latter case, the percentage of the rupture is constant per hour. The contributions of stirring conditions and properties of mycelial pellets to these effects were analyzed quantitatively. For the first type of effects the following correlation was found : d(D_p)/dt=-k^'_c(ND_i)^<5.5>D^<5.7>_v For the second type, (dn)/(dt)=-k_r・n=-α(D^<3.2>_pN^<6.65>D^<8.72>_i)・n where D_i=impeller diameter, D_p=diameter of mycelial pellet, n=numbers of nondisrupted pellets, N=impeller rotational speed, α, k^'_c, k_r=constants. Comparing the shear stress in the tanks estimated by the data previously published with the actual tensile strength of mycelial pellets obtained in this study, it was concluded that the chiping and rupture of mycelial pellets are caused by a high local stress (Reynolds stress) or impeller shock, and viscous stress makes little contribution to them. Under general stirring conditions the tensile strengths of mycelial pellets are larger than Reynolds stress, However, with repeating of load, the tensile strength is reduced, causing the rupture of mycelial pellets.
社団法人日本生物工学会の論文
1968-10-25

菌糸塊状発育菌体に対する攪拌効果

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