The phrase "allowed to settle on" is correct and usable in written English.
It can be used when discussing permission or the act of something being permitted to rest or remain in a particular state or location.
Example: "After the initial reactions, the mixture was allowed to settle on the counter for a few hours."
Alternatives: "permitted to rest on" or "authorized to remain on".
Herbivores (10 thrips or 10 aphids) were offered two disc types at the same time in a Petri dish (diameter: 5.3 cm) and allowed to settle on, move on and between the different discs for 15 minutes.
The diatoms were allowed to settle on the transducer.
The cells were allowed to settle on to the electrodes for 2 h before any measurements were performed.
A drop of the cell suspension was allowed to settle on a glass coverslip coated with 0.1% poly-L-lysine (Sigma Aldrich).
The sample was allowed to settle on the grid for approximately 1 min in a humidified atmosphere.
Helminths were allowed to settle on the bottom and were subsequently collected with the aid of a small probe and a dissecting microscope (Nikon SM-30).
The particles were allowed to settle for 3 5 min on the grid, the excess liquid flicked off with a wick of filter paper and the grids were then air dried before TEM viewing.
Water within flocculation bucket was treated with coagulants (aluminum sulfate and polyaluminum chloride [PAC]) and allowed to settle for 1 hour on non-challenge days, and until turbidity measured below 3 nephelometric turbidity units (NTU), and a minimum of 2 hours, on challenge days.
In the end, one got the most from Coetzee's novel by following the advice of the critic Derek Attridge and carrying out an anti-allegorical reading, where no meaning is allowed to settle firmly on the highly suggestive events, but the ethical import of the text left to work upon the reader on its own terms.
For sugar analysis, approximately 50 mg of aphids was collected from the rearing colony in a clip cage (5.2 cm in diameter; 1 cm high) in the afternoon and allowed to settle overnight on the youngest fully expanded cotton leaf.
Cells were allowed to settle overnight on coverslips.
