The phrase "an active selection" is correct and usable in written English.
It can be used when referring to a choice or decision that is made deliberately and with intention, often in contexts like decision-making or user interfaces.
Example: "In the software, users can make an active selection from the available options to customize their experience."
Alternatives: "a deliberate choice" or "a conscious decision".
The high values of the CV may be easily interpreted as the result of an active selection of text units by the copyists.
These observations suggest an active selection process for tumor-initiating cells.
We propose that the observed asymmetric accumulation is due to an active selection mechanism in the cell.
It is noteworthy to mention that tutorship at this time was optional in this course, so there might have been an active selection by these committed tutors.
Conversely, the reduction in the frequency of the common deletion in liver tumours indicates that there is an active selection pressure against the presence of mtDNA with large deletions, or more controversially that a population of liver cells do not undergo the typical ageing response and subsequently form the liver tumour.
As yet, there is little evidence to support these hypotheses; however, it has been shown recently that mitochondrial DNA copy number is reduced in tumours (Lai et al, 2003; Yin et al, 2004), possibly indicating an active selection process during neoplasia.
Such a passive stabilizing effect, combined with any active selection for maintenance of the TSS, would combine to produce long-term stability in the 5′ structure of specific genes.
In this paper, this problem is solved by two strategies: (1) designing a new active selection criterion to select images for user's feedback.
Whether young stem cells reside at a local fitness optimum remains an open question, however active selection at the population level over long evolutionary periods should have driven co-evolution of stem cells and young tissue microenvironments to optimize performance.
However, to truly establish whether active selection of an allele exists, systematic study of population differentiation is warranted [ 51].
Because they cannot rely on endogenous thermoregulatory mechanisms (e.g., thermogenesis) to control their body temperature, ectotherms mainly use behavioural thermoregulation the active selection of a given temperature to optimize their metabolic processes in heterogeneous thermal habitats [3].
