The phrase "expand in number" is correct and usable in written English.
You can use it to express an increase in a quantity or size, such as: The number of homeless people in the city expanded in number over the past year.
This looks set to rise again, as clinics expand in number and in scope.The industry's two leaders are CVS Caremark, a pharmacy with 640 clinics, and Walgreens, with 372.
The dashed blue line indicates when conservancies began to expand in number and size in 2006.
The progenitor cells (undifferentiated A spermatogonia) expand in number via the formation of syncytial chains by mitosis.
It assumes that any virus present in excess of a threshold level activates APC that, in turn, activate CTL that expand in number and become armed "effector" cells.
Although we do not anticipate that the D principles will expand in number very much, we regard them as 'work-in-progress': further candidates have already been suggested.
The authors showed that the northern populations started to expand in number between 34,000 and 22,000 years ago, thus before the LGM, while the southern populations did so between 18,000 and 12,000 years ago, but then grew faster.
Ever since then, their roles in the military have continued to expand in numbers, skills and responsibilities.
Second, it must have the ability to colonize/infect an individual and to expand in numbers there.
Chemokinetic cells were removed from the underside of the filter by trypsinization and were allowed to expand in numbers by culturing for two days in full serum.
Under Koonin's scenario, mitochondrial group II introns inserted into the host genome sweep to fixation in the population via drift, and subsequently expand in numbers.
The key objective of this group of parasitic protists (obligate parasites) is to infect new hosts and expand in numbers for their species survival/dominance.
