The phrase "aggregate of approximately" is correct and usable in written English.
It can be used when discussing a total amount or sum that is estimated or rounded to a certain degree.
Example: "The aggregate of approximately 500 participants attended the conference this year."
Alternatives: "total of about" or "sum of roughly".
Under the terms of the offer, Roche is offering to acquire Illumina for $44.50 per share in cash, or an aggregate of approximately $5.7 billion on a fully diluted basis.
During the year ended December 31 , 2012 it acquired leasehold interests covering an aggregate of approximately 17,590 net acres in its key prospect areas.
Other employees (larger shareholders) who hold an aggregate of approximately 114,000,000 shares will be released from lock-ups to allow them to sell shares, on closing of the offering.
Yet, the company hopes to make up for it by raising $12.5 billion in capital through common stock offering and equity-linked offering for an aggregate of approximately $7.5 billion.
DynCorp has received an aggregate of approximately $1.2 billion over the last 6 years.
An aggregate of approximately 0.8 million contigs were obtained from all the assemblies.
By 2 AD there were eighty-three commanderies and twenty kingdoms containing an aggregate total of approximately 58 million people according to the census.
For endodermal differentiation, EBs were prepared as above but with aggregates of approximately 100 to 200 cells in endodermal EB medium [DMEM/F12 medium supplemented with 20% FBS (Hyclone), 0.1 mM NEAA, 0.1 mM beta-mercaptoethanol].
For neuronal differentiation, EBs were prepared as above but with aggregates of approximately 50 to 100 cells in neurogenic medium [DMEM/F12 medium (Invitrogen) supplemented with 0.1 mM NEAA, 1× N-2 supplement (Invitrogen, catalogue 17502), 1× B-27 supplement (Invitrogen, catalogue 17504), 25 µg/ml bFGF (Chemicon)] in place of cardiogenic EB medium.
The flasks were agitated (10 periods per minute) for 2 h using a tilting platform, and aggregates of approximately 50 μm in diameter were formed.
Aged mice exhibited cell aggregates of approximately 20 30 μm in diameter, containing multiple nuclei and fewer, shorter, highly thickened processes (Fig. 1G, H, P).
