In contrast to the wild-type,the frequency of appressorial formation was significantly reduced and in addition,no clear mucilaginous sheath was produced by the mutant appressoria.

Based on the analysis on the requirements of the soft-start, power balance adjustment and controlled parking of the large power belt conveyor, this paper studies the metal V-belt type soft-start equipment with the hydraulic viscosity clutch by analyzing oil the advantages and disadvantages of the different soft-start equipments.