This time is impracticable for that this material induces the dentin remineralization process by calcium precipitation [26].
Therefore, the attempt to further increase H c by prolonging the growth time may be impracticable.
The results showed that such strategy could allow the adsorbent beds of both Ring I and Ring II to be fully utilized at the same time, which was impracticable in the previous tandem SMB mode.
Our gap measurements only represent the burst release, because longer time intervals were impracticable due to evaporation of the very small volume (6 μL of PBS) inside the gap, and despite positioning of the experiment in a humid environment.
For proteome analysis, two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) has been previously performed from 50,000 to 250,000 microdissected cells, followed by peptide mass finger printing of single spots [ 6- 8]. Isolation of such high cell numbers by laser-microdissection is extremely time consuming or even impracticable in complex tissues.
Second, the representativeness of task performance samples analysed by such tools is often dubious, partly because in many jobs it is common for workers to perform a variety of tasks for variable amounts of time, which makes it impracticable for observers to take adequate account of all physical exposures and their durations [ 29, 53, 56].
This time interval is often clinically impracticable, as some patients require immediate treatment and some do not want to wait.
Despite concluding that some form of change was necessary, the inquiry categorically stated that any changes "is at the present time and in present circumstances impracticable".
In contrast, previous tasks using discrete trial procedures require many trials to collect sufficient data, and thus such manipulations would have to be repeated an impracticable number of times.
This method, which was destined to become the standard for a time during the 19th century, remained impracticable for more than three centuries because of the inaccuracy of existing lunar tables and because special knowledge and tedious computations were necessary in its use.
