The phrase "a certain bulk" is correct and usable in written English.
It can be used to refer to an unspecified amount or size of something, often in a context where the exact measurement is not important.
Example: "The package arrived with a certain bulk that made it difficult to carry."
Alternatives: "a specific size" or "a particular volume".
"They were only able to make bits that are 2cm square [at a time] and what we are trying to do at the moment is try and make a certain bulk of it," Kapoor says.
Three-dimensional regenerative tissue with a certain bulk cannot survive without sufficient blood perfusion in vivo, so construction of a vascular system in regenerative tissue is a key technology in tissue engineering.
The findings show that the Kunsat increases by up to an order of magnitude (10×) with compression up to a certain bulk density of the moss, after which higher levels of compression result in lowered unsaturated hydraulic conductivity.
PCLOB previously made friends among activists by indicating in a prior report that certain bulk surveillance under Section 215 of the Patriot Act is unconstitutional.
The strain in these sub-regions deviates significantly from the global applied strain for regions smaller than 18 mean cell diameters, indicating a critical specimen size, below which certain bulk properties are no longer representative.
It is shown that certain bulk metal sulfides are intrinsically active and selective for desulfurizing 4-substituted and 4,6-disubstituted dibenzothiophenes.
The drag coefficient is constant for a certain sphere particle in bulk fluid, but the presence of a solid surface increases the drag on a body, which decreases with a growing distance between the microswimmer and the surface [42].
Buffon's other system, notwithstanding that it may have caused surprise more than persuasion, taught how to recognize a certain regularity within the bulk of mountains that look like disordered masses, placed with no apparent pattern one beside the other, and gave a reason to look for connections among the various mountain chains.
The final filter simply selected for poses with a certain amount of hydrophobic bulk located in the region above the binding site, that would be in position to interact with the lipid membrane and with hydrophobic residues around the edge of the site.
It's the way in which the mini-series, one of whose principal writers and directors is Jane Campion, insists on a certain opaqueness and bucks the bulk of what's on television, even in this golden age of the medium.
Each electromagnet was operated individually; only the lower electromagnet had been operated until the bulk reached a certain level and then the upper electromagnet was started to operate with a constant current of the lower electromagnet.
