"a significant occurrence of" is correct and usable in written English.
You can use it to describe an event that has a significant impact on a person or situation. For example, "The significant occurrence of the hurricane caused extensive damage."
The present study has obviously demonstrated that there is a significant occurrence of bacterial pollution indicators and pathogenic bacterial groups in the Meenachil river.
There is a significant occurrence of plankton blooms in Djibouti between the months of September and December.
This included a significant occurrence of motifs associated to a defined transcriptional response upon anaerobiosis.
The data did not suggest a significant occurrence of injecting drug use[ 8, 9].
When considering the findings from this valuable sample the logistic regression revealed a significant occurrence of hypoplasia and post-eruptive breakdown occlusally.
Since we have a very limited number of replicates and hybridized evolutionally divergent mRNA on a human chip we expect a significant occurrence of imperfect hybridization and cross-hybridization.
In addition, we observed a significant occurrence rate of CLxxxxLHM motif in other GenBank® fungal genome peptides.
Nevertheless, a small but significant occurrence of B lymphocytes was reported in the skin of patients with PsA, but not in patients with PsC [ 7].
Promoter regions of 27% of genes up-regulated present at least one significant occurrence of an ABA-responsive CRE.
The second best model contained the marginally significant occurrence of an eagle owl breeding pair within 1.5 km of the buzzard nest (Figure 1C, eagle owl within 1.5 km χ2 = 3.23, p = 0.071, model weight = 0.189).
The laser focal point is the only location along the optical path with a large photon density to generate significant occurrence of two-photon excitation.
