The phrase "allowed to spread for" is correct and usable in written English.
It can be used when discussing permissions or conditions related to the duration of something spreading, such as a rumor or a disease.
Example: "The information was allowed to spread for a limited time before being retracted."
Alternatives: "permitted to disseminate for" or "authorized to circulate for".
Plated cells were allowed to spread for 60 min on various matrices, and the percent of cells spread compared to all plated cells was determined.
Cells were allowed to spread for 60 min in the incubator and then stopped by directly adding fixing buffer followed by washing with phosphate buffered saline (PBS).
After 48 hour, cells were collected, allowed to spread for an hour on fibronectin-coated surface, then fixed and immunostained for vinculin.
Muscle cells were maintained for 3 5 d and then spinal neurons from normal (uninjected) embryos were seeded on them and allowed to spread for 1 d.
To determine if the cell-applied strains are sufficient to globally stiffen a fibrin gel, cells were suspended in polymerizing fibrin and allowed to spread for 18 hours before the low strain shear modulus of gels was measured.
The cells were allowed to spread for different times after which they were fixed and labeled with 0.2 units/ml of AlexaFluor 568-conjugated phalloidin and 1 µg/ml of Hoechst Sigma-Aldrich, Saint Louiss, MO, USA) for 1 h.
Flexible silicone rubber films were prepared by adding 25 µl silicon DC-200 to the centre of 6-well plate wells (Greiner Bio-One, Stonehouse, Gloucestershire, UK) and allowing to spread for 18 h.
After 5 h, suspended cells were adhered to fibronectin-coated coverslips and allowed to spread (30 min for HDFs and 15 min for 10T1/2 cells) to facilitate the quantification of the number of binucleated cells, as a measure of failed cytokinesis in suspension, using immunofluorescence microscopy.
They pointed to the case of ultra-nationalist Buddhist monk Ashin Wirathu — who referred to himself as the "Burmese bin Laden" — being allowed to spread hate speech unchecked for years on Facebook.
For experiments in which we froze actin assembly and disassembly with the JLY cocktail, cells were allowed to spread on PLL coated glass for 30 min in the presence of 10 µM Rock kinase inhibitor (Y27632).
Then, 48 h after transfection, fibroblasts were trypsinized off their tissue culture vessels and were placed on the above-described collagen-coated polyacrylamide gel disks at 3000 cells/disk +/− PDGF (200 nM) and allowed to spread on the collagen surface gel for 6 h in quiescent medium at 37C.
