In addition, even if a mechanistic understanding of these processes exists, feedbacks between and within social and ecological systems are often ignored (Nicholson et al. 2009) or prone to inconsistencies (Cumming et al. 2005).
This implies there exist feedback mechanisms that act to renormalize the expression of many NMD-target genes when NMD function is compromised.
In order to allow feeding input signals to be propagated, even in the case that no feedback signals exist, the feedback signal is biased by a constant unit value.
We also assume that there exists a feedback channel between each legitimate user and the transmitter.
Then Theorem 1 assures that there exists a feedback gain matrix K so that systems (3.11) and (3.12) realize the synchronization.
Then, from Theorem 2, there exists a feedback controller with dimension (operatorname{dim} mathcal{X}_{ K}=operatorname{dim} mathcal{V}_{2}-operatorname{dim} mathcal{V}_{1}=2).
As RGS4 is only transiently up-regulated by Sim1, there likely exists a feedback loop to maintain a proper level of RGS4 and hence the homeostasis of serotonin release.
In addition, no system exists for feedback when patients are transferred between different DM clinics.
However, whether there exists a feedback loop on the activity of AMPK is still unknown.
In addition, as mentioned above, evidence exists that feedback mechanisms may overcome the effects of mTOR inhibition.
