Bevel-helical gearbox B3 to th position of Article No and Article No sup B3-VV-19-D

Flender/Flender Gear Units/Bevel-helical gearbox B3

ormation as well as lowering polyphenol en-zyme activity and the browning reaction. Pathogenic bacteria such as Pseudomonas tolaa- siiandMycogone perniciosa can be eliminated at 2 kGy and shelf life can be increased from 2 to 8 days with storage at 1 (Skou et al., . However, at such dose, the irradiation can affect some physical characteristics (hyphes contraction and discoloration). Achieving the same dose at different dose rates appears to have some signicant effects (hyphes contraction and discoloration). Irradiation treatment (2 kGy) at dose rates of 4.5 kGy/ ( /H and 3 kGy/ (/H has been studied to evaluate their effects on the overall quality of the mushrooms (Beaulieuet al., 1a; Beaulieu et al., 1b). The irradiation effect of the two dose rate waseffective in lowering the number of yeasts, molds, and bacteria and extending the shelf life by 6 days (Beaulieu et al., . However, on the basis of mushroom whiteness, /H1 and /H1showed, respectively, shelf life increase of 2 and 4 days. After storage of 9 days, the /H1treated mushrooms were signicantly ( /H1.0) darker than /H1and highest whiteness color was observed in /H1. In treated mushrooms, polyphenol oxidase activity was signicantly lower ( /H1.0) than in the control. The total content of phenolic compounds throughout storage was signicantly higher ( /H1.0) only in /H1, as compared to /H1and control samples (Beaulieu et al., . The greater phenol accumulation was in accor- dance with the better preserved coloration observed in /H1indicating diminished oxidation rate in the sample. In /H1, the higher phenol concentration and the better preservation of whiteness throughout the storage period would be explained by diminished activity ofpolyphenol oxidases. But this explanation was not valid for /H1. The coloration and brow- ning expected to be less in /H1than in /H1were more pronounced and were similar in /H1 and in the control. The cellular membranes observed by electron microscopy revealed bette