The phrase "approximately the sum" is correct and usable in written English.
It can be used when you want to indicate that a value is close to a total or aggregate amount, but not exact.
Example: "The total cost of the project is approximately the sum of $10,000, including materials and labor."
Alternatives: "roughly the total" or "about the total amount".
In STR analysis, both PCR amplification and sequencer detection are fundamentally linear processes, so a mixture of genotypes produces a signal that is approximately the sum of the separate genotype signals [29].
Finally, when both pupils are apodized, the degradation in axial resolution is approximately the sum total of the resolution loss that results from apodizing each pupil separately.
As expected, the molecular masses are approximately the sum of two contributing moieties, because the chimeras have residues equaling to the sum of Xyn, Glu, and linker peptide.
The combined presence of both Lpd and VASP further enhances the anti-capping to a level that is approximately the sum of the individual protein activities.
Data in Table 2 show that experimental values of ΔΔ G of the double mutants are approximately the sum of contributions from the single mutants and ΔΔ G of the triple mutant is the sum of the values for the three single mutants.
Sensitivity analysis was selected to investigate overall CLint,T over the range of normal transporter activity for rosuvastatin uptake (250 μl/min/10 cells; approximately the sum of uptake transporter activity as reported in Jamei et al). to a complete loss of uptake transporter activity (0 μl/min/10 cells).
Rather than showing complex interactions, our analytic and simulation-based results show that the combined effect of multiple modifications approximately equals the sum of individually predicted effects.
Often the original image is denoted by f, which is considered to approximately equal the sum of two components, u and v, i.e. f≈u+v.
As one would expect, the proportional impact of output changes on total hours worked approximately equals the sum of its proportional impact on employment and working time9.
The size approximately matches the sum of molecular weights of GFP (25 kDa) and a shedded mature form of NRG1β1 (30 kDa).
