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The phrase "air for approximately" is correct and usable in written English.
It can be used when discussing the duration of time something is exposed to air or the time it takes for something to be aired out.
Example: "The paint needs to dry in the open air for approximately two hours before it can be touched."
Alternatives: "exposed to air for about" or "in the air for roughly".
Exact(3)
The oxidized form was obtained from the purified protein dissolved in water at approximately 1 mg/mL and then exposed to air for approximately a week at room temperature and pH 7.2.
Neighbours is on air for approximately forty-four weeks per year.
Both communities are only accessible by air for approximately six months of the year due to monsoonal weather conditions, high rain fall and road closures.
Similar(57)
After the pelletizing process, the pellets were air dried for approximately 48 h and were broken up, sieved into the proper pellet size, sealed, and stored at −20 °C until utilization.
Pellets were allowed to air dry for approximately 2 min and re-suspended in RIPA lysis buffer for SDS-PAGE.
The pellet was air dried for approximately 5 minutes and re-suspended in 11 μl of nuclease free water.
Next a part of the homogenized samples was dried at 60°C in a forced air oven for approximately 24 hours.
The pellet was air dried for approximately 10 20 min and the DNA re-dissolved in 1 2 ml endotoxin-free TE-buffer over night at 4°C.
Prepare laminin-coated surfaces by precoating first with 2μg/ml polyornithine in sterile distilled water for 30 minutes and air dry for approximately 30 min. Incubate with 100μg/ml solution of laminin in DMEM over polyornithine-coated dishes for 3 hours at 37°C.
The samples were prepared by drop-casting 10 μL of a 0.001 wt % CNC suspension onto a freshly cleaved mica surface with an approximate area of 2 cm, and air-dried for approximately 30 min. Prior to the drop casting, the CNC suspensions were ultrasonicated for 5 min to reduce the number of aggregates.
To optimize yield, protein in polypropylene flasks (residual) and centrifuge tubes was air-dried for approximately 1 h.
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