Sentence examples for occurrence of point from inspiring English sources

Antigenic drift is the frequent occurrence of point mutations resulting from defects in RNA replication mechanisms, while antigenic shift is less frequent, involving re-assortment of the RNA segments arising from exchanges between different strains in host cells infected by multiple viruses.

A possible explanation for the decreased enzyme levels could be occurrence of point mutations in the ACVS and IPNS genes, resulting in inactive and possibly misfolded proteins which are specifically degraded.

In view of the highly heterozygous nature of cassava and the occurrence of point mutations and/or insertion-deletions in the EST-SSR alleles outside the microsatellite repeat region (unpublished results), most null alleles observed in the present study are likely due to sequence variation in the primer binding sites.

Nevertheless, this may not be a straightforward assumption as, except for the fixation of beneficial mutations through positive selection, the occurrence of point mutations exactly in the same genomic position simultaneously for several strains (homoplasy) likely results from recombination within the population (Awadalla 2003).

In this study, nominal variant sequences were classified as SNP variants if they displayed a repeat motif that differs from the commonly-described motif, an occurrence indicative of point substitution.

Given a database of assertions concerning relative occurrences of points in time, we are interested in various operations on this database, including compiling the assertions into a representation that supports efficient reasoning, determining whether a database is consistent, and computing the strongest entailed relation between two points.

It is useful to consider the mark connection functions additionally to the partial pair correlation functions since they characterize the occurrence of the point types with eliminated influence of fluctuations in point density; see [ 23], p. 332.

Those general models are usually described through their conditional intensity λ , which represents the probability of occurrence of a point at time t given the past before t.

The first generation starts after the occurrence of a point mutation and consists of nine gray individuals and the black mutant.

Also in this study, as in others (15), occurrence of end point lesions was associated with higher forefoot barefoot plantar pressure regardless of study arm.

As a measure of the preferred occurrence of specific point mutations within a gene, termed 'mutation hot spots', we calculated entropy based 'mutation selection scores' as described [ 19].