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Discover LudwigThe phrase "a ratio of at" is not correct and does not make sense in written English.
It seems to be an incomplete expression and lacks clarity in its intended meaning.
Example: "The study found a ratio of at least 3:1 in the results."
Alternatives: "a ratio of" or "a proportion of".
Exact(42)
Consumer and civil rights groups were quickly outnumbered by their opponents, by a ratio of at least 50 to 1, according to Hill staff and lobbyists.
The target I set is also simple: Every school should reach a ratio of at least 1.000 — that is, as many college-level tests taken as diplomas issued.
Groundwater samples required the presence of sterile chalk in a ratio of at least 1 13 to promote isoproturon degradation.
The new policy, effective Monday, does not apply to organized, escorted groups, but it will require that such groups be escorted by teachers or chaperones in a ratio of at least one adult for every 15 children.
With a few exceptions, public schools that achieved a ratio of at least 1.000, meaning they had as many tests in 2012 as they had graduates, were put on the national list at washingtonpost.com/highschoolchallenge.
With a few exceptions, public schools that achieved a ratio of at least 1.00, meaning they had as many tests in 2015 as they had graduates, were put on the national list.
Similar(18)
Sorafenib was eluted isocratically with mobile phase (acetonitrile/methanol/1% acetic acid at a ratio of 35 38 27) at a flow rate of 1 ml/min and monitored at 254 nm.
To evaluate the suppressive ability of these three cell types, each was co-cultured with mouse CD4+ Naïve T cells at a ratio of 1 20 at different passages.
Still, be that as it may, the good old "bobby on the beat" is still the backbone of UK policing, having to deal with the public at a ratio of 1 3022 at any given time.
Chloro-methyl-fluorescein-diacetate-labelled apoptotic cells were then incubated with DCs at a ratio of 1 : 1 at 37°C.
Immature monocyte-derived DCs were able to capture killed breast cancer cells after 1 hour of incubation at a ratio of 1 1 at 37°C (Fig. 1b,1c).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com