However, despite being first proposed more than 80 years ago, there remain few examples that fit the criteria for heterozygote advantage, all of which are associated with disease resistance and are maintained only in the presence of disease or other gene-by-environment interaction.
The amplification was associated with extra-chromosomal double minutes; these are unstable genomic elements that were detected in vivo by fluorescence in situ hybridization analysis of mouse-derived tumors but were rapidly lost in primary cultures, probably because double minutes are maintained only in the presence of in vivo selection pressures within the breast microenvironment.
In general, as with the condensation of sulfur atoms or with the crystalline transitions in silicon, the symmetry implicit in the formulation of the theory will be maintained only in the totality of possible solutions, not necessarily in the particular solution that appears in practice.
The transposon insertion in the essential gene is maintained only in the duplication derivatives.
To reduce the use of antibiotics, the expression vector was reconstructed so that the recombinant form was maintained only in the presence of kanamycin.
On the other hand, dialectal distinction was maintained only in the unrounded environment for female speakers [rounded: χ2(3) = .82, ns.; unrounded: χ2(3) = 8.28, p < .05].
The point is that institutions, including health care institutions, capable of protecting opportunity can be maintained only in societies whose productive capacities they do not undermine.
It was demonstrated that in a plant with average C/F ratio, positive carbon gain could be maintained only in the microsites where the relative PPFD (photosynthetically active photon flux density) was above 15 or 30% of unshaded conditions in early- or mid-summer, respectively.
Therefore, it is logical to assume that as a result of the formation of hybrid nanocomposite films, the conformation of macromolecules, in comparison with the individual CP films, varies and conjugation is maintained only in relatively shorter chain segments which determine the spectral properties of the nanocomposites.
A role of cytosine methylation for inactivation of transposons might have been maintained only in some insects such as Drosophila [11] and possibly Medauroidea, but not in others such as aphids and coccids [22], [38].
The ancestral distal position was maintained only in foxtail millet and rice.
