Heritable factors account for an estimated 60 80% of the variability in PBM, with diet, physical activity and hormonal status serving as important modifiers of bone accrual.
Ubiquitin is a small 8.5 kDa peptide that can either target the conjugated protein to proteasomal degradation or serve as a modifier for protein function [ 81, 82].
These promiscuous molecules serve as important potential modifiers for local, tissue-, or possibly even cell-type-specific fine-tuning of MeCP2 protein levels, either developmentally or in response to cellular activity.
We anticipate that these PMMA particles could further serve as useful modifiers to generate porous polymers, including siloxane elastomers.
Several of these mechanistic factors may actually serve as confounders/effect modifiers (e.g., depression, sleep apnoea, fatigue) rather than being true mediators (e.g., lack of physiological challenge, shortened photoperiod) (Stamatakis and Punjabi, 2007).
In practice most polymers are filled, e.g. with hard particles or fibers, with colorants, or with soft particles that serve as impact modifiers.
These genetic and epigenetic factors can serve as phenotypic modifiers.
This is particularly true for outcomes for which vitality, function, activity or any of the range of health-relevant correlates of relative activity may serve as effect modifiers.
Alterations at chromosomes 11q13, 16q22-q24 and 18q21, all of which have been associated with aggressive tumor behavior, may serve as genetic modifiers to HER2 amplification.
Water and light oxygenates can also serve as catalyst modifier when used in low levels in the feed stream.
