Exact(11)
The dried cake was ground and screened with a 325-mesh sieve.
The freeze-dried powder of Qu-PMs was stable without any shrinkage or collapse of the dried cake.
In this way, the relationship between the instantaneous thickness of the dried cake and the drying time is determined for different drying temperatures.
Accurate results are obtained for various types of products, characterized by a different dependence of the mass transfer resistance on the dried cake thickness.
Experimental investigation is required to determine model parameters, namely the coefficient of heat transfer to the product, and the resistance of the dried cake to vapor flow.
Dry layer resistance, which is the resistance of dried cake against water vapor flow generated from sublimation, is one of the important parameters to predict maximum product temperature and drying time during primary drying in lyophilization.
Similar(49)
Overall, the freeze dried cakes behaved as neither classic closed cell nor open cell materials, with their compressive elastic moduli reflecting a closed cell elastic response whilst their failure stresses reflecting an open cell failure mode.
Furthermore, the lyophilisation behaviour of a citrate and a tris HCl buffer are well described by the model and values of Deff are constant at temperatures below the collapse temperatures of the dried cakes.
Org 25435 was supplied as a freeze-dried cake stored at 2-8°C 2-8°Ceconstituted with wandreconstituted.
Future experiments will be performed to ensure that the source intensity is not causing local heating within the frozen or freeze-dried cake.
As the temperature rises, viscous flow results in changes to the structure of the freeze-dried solid which may result in collapse of the freeze-dried cake.
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