The phrase "by certain methods" is grammatically correct and commonly used in written English.
It can be used to describe how something is done or achieved. Example: The experiment was conducted by certain methods that have been proven to be effective in previous studies.
But oil extracted by certain methods, like the cold-pressed process, may still contain protein and can indeed pose a risk.
One of these is that certain types of metallic compounds lend themselves to easiest extraction by certain methods; for example, oxides and sulfates are readily dissolved in leach solutions, while sulfides are only slightly soluble.
A few literature reviews have indicated the general trend of reduction or concentration of pesticide residues by certain methods of food processing for a particular active ingredient.
The other fish it will no longer carry are Atlantic halibut, octopus, sturgeon, tautog, turbot, imported wild shrimp, some species of rockfish, and tuna and swordfish caught in certain areas or by certain methods.
Nanoparticles constituted with polymeric materials can be usually fabricated by polymerizing monomeric materials as sources of the polymers by a variety of polymerization techniques, or nanoprecipitating the established polymers by certain methods followed by dissolving them in solvents.
Generally, the frequency domain errors of machined surface can be obtained by certain methods if the frequency domain errors in the cutting point are known.
Once the parameters are determined for a given spectrum analyzed by a certain method, one can obtain the P-value of a given score by integration.
Micrographs of the film surfaces were analyzed by a certain method to investigate the droplet distribution in number and size for different materials.
Certain methods used by the petitioners to secure a reduction in the retail prices of their cigarettes were in evidence.
It claims to be able to alter the muscle activity, in terms of both facilitation and inhibition, by certain application methods.
Arbitron, the largest radio ratings service, has settled a lawsuit in California over how it measures minority audiences, agreeing to pay $400,000 and to abide by certain research methods in tracking black and Latino radio listeners.
