The phrase "allowed preparation" is correct and usable in written English.
It can be used in contexts where you are referring to a preparation that is permitted or authorized.
Example: "The allowed preparation for the experiment must be followed to ensure accurate results."
Alternatives: "permitted preparation" or "authorized preparation".
The elaborated automatic system allowed preparation the porous coatings, repetitively.
Two-step modification of starting polymer allowed preparation of self-supported membranes.
Radiolabeling procedures allowed preparation of (1) and (2) with high radiochemical yields (67 ± 7 and 53 ± 7%, d.c).
Advances in bilayer fabrication have allowed preparation of lipid bilayers with membrane resistance of >1 GΩ ("gigaseal") in flow, microfluidic and array formats, which have enabled single-channel and multi-channel recording.
These techniques allowed preparation of hydroxyapatite (HA) scaffolds that exhibited a wide range of mechanical and porosity profiles, with some displaying unusually high compressive strength up to 152.4 ± 9.1 MPa.
Compositional adjustments in the design of FeB-based alloys have allowed preparation of metalloid poor Fe40Co5Ni35Zr5B15 that has γ-Fe as a primary crystallisation product for obtaining ductility of metallic glass-matrix toughened by γ-Fe crystallisation.
It may also allow preparation of future models to predict the final positioning of the fibres.
Precise control of the preparation parameters allows preparation of solids with controlled morphology, texture and acid properties.
Although the use of grooved cast-ion, copper, or lead laps also allows preparation of excellent relief-free sections (Craig et al. 1981), they require constant resurfacing.
The cryogelation techniques allow preparation of elastic mechanically stable monolithic matrices easily permeable to aqueous solutions of proteins and suspensions of cells.
Nevertheless, the sonication allows preparation of aqueous suspension with high content of individualized SWNTs necessary for observation of the SWNT emission and NIR absorption.
