The phrase "at persistently" is not correct and does not make sense in written English.
It seems to be an incomplete or incorrect construction and does not convey a clear meaning.
Example: "He was at persistently trying to improve his skills" does not work.
Alternatives: "consistently" or "repeatedly".
Large-scale land conversion for agriculture in Brazilian Amazonia is occurring at persistently high rates.
Low SO2/HCl and SO2/HF ratios are instead characteristic of late stages of volcanic degassing, typically being observed in the concluding stages of basaltic eruptions, or during periods of reduced magma supply at persistently degassing volcanoes.
In his speech on Monday, Mr. Obama said states would be asked to identify schools that perform at persistently low levels, with graduation rates of 60 percent or less.
Vulcanian eruptions with various frequencies are often observed at persistently degassing volcanoes of dacitic-andesitic magmas and the presence, or absence, of Vulca-nian eruptions is attributed to slight changes in the conditions at the top of the convecting magma (Shinohara, 2008).
Whether signatures can be revoked has been one of the most bitterly contested questions surrounding the state's pioneering parent trigger law, which allows parents at persistently low-performing schools to petition to overhaul staff and curriculum, close the campus or turn management over to a charter operator.
Nor did PD-1 expression correlate with the frequency of a particular V-beta subset; high PD-1 expression was found on subsets that were present at persistently low or high frequencies (e.g. Vb 22 frequencies ranged between 2.7 and 3.1% and Vb 21.3 frequencies ranged between 33.1 and 22.1% despite both expressing high frequencies and intensities of PD-1).
Change in functional status was operationalized as follows: not impaired (independent at T0 and T1), was impaired (dependent at T0; independent at T1), became impaired (independent at T0; dependent at T1), persistently impaired (dependent at T0 and T1).
Some of the naturally scrapie-infected animals were born and raised at a persistently scrapie-infected USDA animal research unit at Pullman, WA and developed either preclinical or clinical scrapie.
We therefore aimed at eliminating persistently infected hepatocytes carrying HBV cccDNA by redirecting cytolytic T cells toward HBsAg-producing cells.
Water at five persistently failing beaches met the minimum standard for the first time, but six beaches failed.
The December resolution expressed "alarm" at the "persistently large number of reported and unreported atrocities and widespread untouchability practices, notably manual scavenging".
