The phrase "a positive feedback system" is correct and usable in written English.
It can be used in contexts related to systems theory, biology, engineering, or any field where feedback mechanisms are discussed.
Example: "In ecology, a positive feedback system can lead to rapid changes in population dynamics, as seen in predator-prey relationships."
Alternatives: "a reinforcing feedback loop" or "an amplifying feedback mechanism".
Whenever you have a positive feedback system like this, an isolated incident can put you on a slippery slope.
We need a positive feedback system: The Dignity Commission included a recommendation on 'appreciative inquiry' - focussing on a range of feedback, including positive, rather than waiting for complaints or failures to discover where things are going wrong.
For example, a speaker describing a positive feedback system said, "so it's like this sort of…" trailing off in speech but providing a spatial characterization in gesture.
Thus, in a small group interaction, a teacher might notice that a student uses a seesawing gesture to characterize what is, in fact, a positive feedback system and then offer clarification.
If correct, this suggests that we are beginning to see the effects of a positive feedback system that will continuously eat away at the Arctic's summer ice until there isn't any.
We found that PGE2 could induce expression of PTGER4, indicating a positive feedback system induced by the PTGS-PGE2 synthase-PGE2 pathway to maintain PTGER4 expression.
A synthetic positive feedback system resulting in binary expression response was transduced via lentiviral transduction.
In addition, expression of RANK has been shown to be elevated in peri-implant tissue in aseptic loosening, aiding osteoclast differentiation [ 40] and, as RANK demonstrates a autoregulatory positive feedback system, this could further enhance osteoclast differentiation in this tissue [ 60].
Therefore, miR-338 serves the functional interest of the host in this case via a higher-order positive feedback system that downregulates expression of AATK repressors and enforces neuronal differentiation downstream of the kinase.
Rather than the "positive feedback" system of LA513, use of a late-acting promoter in a more conventional bipartite expression system might perhaps give more reliable control over the time of expression of an effector molecule and hence the lethal phase; this has previously been demonstrated in Drosophila for female-specific promoters and for embryo-specific promoters [ 27, 39, 40].
