The phrase "a certain proportion in" is correct and usable in written English.
It can be used when discussing a specific ratio or percentage related to a particular context or subject matter.
Example: "The study found that a certain proportion in the sample population preferred online shopping over traditional retail."
Alternatives: "a specific percentage of" or "a particular ratio in".
Here is how it works: For every $100 Man takes in, a certain proportion is invested in a bond, either a zero-coupon U.S. Treasury or a bond issued by a highly rated bank.
Restaurants can serve unlimited, full-portion cocktails, but unlike distilleries they must sell a certain proportion of food in order to be able to serve liquor.
For this reason "the exchange of all places constantly tends to a certain proportion, and that in the very nature of things" (SL 22.10).
These individuals, therefore, have a large proportion of CpG sites characterized by low methylation, a smaller proportion of sites characterized by high methylation, and a certain proportion of sites in between the two peaks with moderate levels of methylation.
A certain proportion of patients in the control group [labeled P(Imp|C)] show improvement greater than the MID.
Meanwhile, PLGA was also mixed with NaCl at a certain proportion and dissolved in acetone as the upper stratum bony material.
Advantages of ePRO are the reduced need of human resources for data collection making it economically efficient and the increased data quality as paper-based systems account for a certain proportion of variance in medical outcomes [ 45].
The nano-HAP/collagen I composite powder material and PLGA were mixed with sodium chloride (NaCl) at a certain proportion and dissolved in acetone as the substratum cartilage material.
Owing to the unrestricted growth of the bacilli in immunodeficient hosts, Mtb infection in a certain proportion of these people can result in the pulmonary disease [66].
In either case, a certain proportion is eventually discarded in all or some lineages, after being active for some time, while others persist.
