The phrase "a lesser portion" is correct and usable in written English.
It can be used to describe a smaller or reduced part of something, often in a comparative context.
Example: "In the overall budget, a lesser portion is allocated to marketing than to research and development."
Alternatives: "a smaller share" or "a reduced segment".
Most of the gas is stored in organic-rich rock, while a lesser portion of gas in place is in pore spaces (Cipolla et al. 2010).
Thus, a significant fraction of TCC and TCS (70 90% and 30 70%, respectively) will accumulate in sewage sludge with a lesser portion of the residual load being discharged via effluent.
The observation of a lesser portion of Methanothermobacter was expected, as the operating condition of the bioreactor (approximate 35°C) was not in favour of this thermophilic Archeon's proliferation 55-65°C 55-65°C.
Most (60 80%) of the chylomicron remnants holding RE are taken up by liver receptors and incorporated into hepatocytes, while a lesser portion (20 40%) is taken up into extrahepatic tissues.
Symmetric divisions was found to be the predominant form of GSC propagation, while a lesser portion of the GSCs undergo ACD and may account for a minor part of the cellular heterogeneity in the tumour [ 111].
Retail and wholesale commerce alone account for about one-seventh of GDP, and business services account for a slightly lesser portion.
Although the coarse loamy and fine-loamy soil covers lesser portion of the study area, but they are found to be highly contaminated having 44.9 and 36.7% NP fluoride content in groundwater.
Whatever the real numbers, it seems clear that Troglita's regular troops formed the lesser portion of the imperial army.
A distinction was made between complete, half, and lesser portions of evidence, evading the problem posed by such a rigid system of evaluation.
It covers an area of about 250,000 square miles (650,000 square km) in a structural basin lying mainly in southeastern Saudi Arabia, with lesser portions in Yemen, Oman, and the United Arab Emirates.
