The phrase "a number of at" is not correct and does not make sense in written English.
It seems to be a combination of two separate phrases, "a number of" and "at," which should not be used together in this way.
Example: "A number of people attended the event at the park."
Alternatives: "several at" or "many at".
A number of at least 50 metaphases for each specimen were evaluated.
According to our calculation a number of at least 15 patients per group were needed in order to achieve a power of 90% with an a-level of 0.05.
For Delphi studies different numbers of panellists have been reported [ 53 ], and while a number of at least 20 panellists has been recommended [ 54 ], it is also recommended that the panel should not be too large so as to avoid drop-out.
Considering this rate, our estimation of a number of at least 36 chromosomal rearrangements between Prunus and Fragaria, assuming that the initial number of chromosomes of the common ancestor was x = 9, allows us to estimate that the divergence of these two species dates from approximately 29 Mya.
This curvature might be induced and stabilized by a number of at least partially redundant mechanisms, such as formation of a coat-like structure by the Nup107 160 complex (Devos et al, 2004; Mans et al, 2004; Brohawn et al, 2008) or oligomerization of pore membrane proteins, although it is not clear how the different proteins contribute to the different modes of membrane bending.
A number of at-risk dams also pose a downstream flood hazard.
She said that a number of at-risk former clients of Kids Company are now unsupported, despite a number of local authorities being tasked to look after them.
Thomas J. Tucker, principal at Deerfield Run Elementary School, said the arts-heavy school, which serves a number of at-risk students, used its donation to sponsor field trips, including one to the University of Maryland.
The cloud-based application, a 2011 Intuit App Finalist, creates a colorful, but uncluttered, online dashboard with a number of at-a-glance metrics that help you get a sense of where your business stands.
Hope to cope: Instead of solely taking the "expectant management" approach, try a number of at-home techniques.
