The phrase "at a certain proportion" is grammatically correct and can be used in written English.
It is typically used to indicate a specific or predetermined ratio or amount. Example: In order to make a cake, the recipe calls for sugar and flour at a certain proportion of two cups of sugar for every three cups of flour.
The third tool of monetary policy, that of the cash reserve requirements (and, in some countries, certain types of government securities) for commercial banks, provides that banks must maintain money balances (in the form of deposits in the central bank) at a certain proportion of their liabilities.
Meanwhile, PLGA was also mixed with NaCl at a certain proportion and dissolved in acetone as the upper stratum bony material.
These samples, each represented by a mixture of non-germinated and germinated seeds at a certain proportion, were used for RNA isolation, cDNA library syntheses and transcriptome analyses.
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.
In the present study, Schwann cells of sciatic nerve of fetal rabbit and vascular endothelial cells of thoracic aorta of fetal rabbit were cocultured at a certain proportion in biodegradable fiber-reinforced 3D scaffolds with satisfactory mechanical properties in vitro to form prevascularized nerve complexes.
Therefore, the results indicate that at least a certain proportion of macrophages may support PCV2 replication, but main cells where PCV2 replicates are of epithelial/endothelial origin.
Although we inherently hypothesize that, if we predict these events correctly, we will be able to initiate preventive measures that will avoid at least a certain proportion of fall incidents, we cannot prove this until a sound controlled study has been performed.
In the absence of any gradients (i.e., uniform Ft, Ds, and Fj expression across the tissue), Ft (blue) and Ds (purple) freely associate at junctions, with a certain proportion binding to form heterodimers (indicated by double black bars).
A good fit to the data assumes that at all ages a certain proportion of transfusion recipients have a higher rate of dying and the remaining proportion has a survival rate that corresponds to that of persons of the same age group in the general population.
In S group, Leptospirillum accounted for a certain proportion (> 1%) at 30 and 35 °C on day 30.
At every time step a certain proportion of the MTS are removed from the system regardless of their position along the axon (thus representing signal loss).
