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The phrase "maintained under vacuum" is grammatically correct and can be used in written English.
It is often used in technical or scientific writing to describe a condition where air or gas has been removed from a certain space or container. Example: The experiment was conducted in a controlled environment, with the samples being maintained under vacuum to prevent any contamination from outside particles.
Exact(6)
A hydrophilic membrane, hydraulically connecting the compost to a water chamber, maintained under vacuum, controlled the water content in the compost.
The sonicated powders were transferred onto a glass plate and dried in air; subsequently, the powder was transferred onto a carbon tape placed over an aluminum stub and maintained under vacuum 24 h prior to electron microscopy-imaging.
After electrospinning, samples were maintained under vacuum overnight to ensure complete solvent removal, photocrosslinked as above with ultraviolet light (Blak-Ray) in a nitrogen atmosphere, and incubated in PBS overnight.
To obtain calcein loaded LUVs, at 2 mg/ml lipid concentration (PC/PG/ [14C] PC 9/1/0.01 mol ratio), a solution in chloroform was dried under a gentle stream of nitrogen and maintained under vacuum for at least 2 h to ascertain removal of residual solvent.
The obtained solids were then further dried to a constant weight at 60°C, and maintained under vacuum over phosphorus pentoxide in a desiccator.
The analyzer tube is maintained under vacuum (~10−5 Pa) in order to reduce collisions between the ions of interest and gas molecules.
Similar(54)
Mice were maintained under sterile conditions.
All mice were maintained under SPF conditions.
Animals were maintained under local vivarium conditions.
Samples were maintained under natural light conditions.
After the growth of Si1−x Ge x nanowires, the flow of SiCl4 was terminated and then a flow of O2 was introduced under vacuum maintained by mechanical pump.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com