The phrase "a content was calculated" is not correct in standard written English.
It should be "content was calculated" or "a piece of content was calculated" depending on the context.
Example: "In the analysis, content was calculated to determine its effectiveness in engaging the audience."
Alternatives: "the content was computed" or "a calculation of the content was made."
Total chlorophyll was extracted into 80% acetone, and chlorophyll a and b content was calculated by using MacKinney's coefficients, in which chlorophyll a equals 12.7(A663) - 2.69(and5) and chlorophyll b equals 22.9(A645) -4.48(A663).
(A ) The GC content was calculated for 67 conversion tracts (including 500 bp of flanking sequence, top) and compared to a background distribution of 5,000 equally sized random locations sampled from non-peri-centromeric regions (bottom).
Methionine (Acros Organics, New Jersey, USA) was used as a standard and protein content was calculated from the nitrogen content of the material, using a protein conversion factor of 6.25 [ 68].
Absorbance at 540 nm was measured using a microplate reader, and nitrite content was calculated based on a standard curve constructed using NaNO2.
RPG4/GC or PG4 DNA density normalized for GC content was obtained by dividing the PG4 DNA density by GC content of a given region; GC content was calculated using in-house software.
In addition, according to a previous report, G+C content was calculated from the 9 nucleotides of the insertion-target sites and 10 nucleotides up- and down-stream of target site of 50 randomly selected clones.
The resulting combustion gas (CO2) was passed through an Infra-Red Analyzer and carbon content was calculated as a percent of catalyst weight.
The flavonoid content was calculated from a calibration curve using a catechin as standard and expressed as g catechin equivalents/kg of tea leaves (g CTE/kg).
The tannin content was calculated from a calibration curve using a catechin as standard and expressed as g catechin equivalents/kg of tea leaves (g CTE/kg).
Three random pictures were made at a 10X magnification and collagen content was calculated as percentage collagen of total surface area using automated analysis software (Clemex, Quebec, Canada).
