Ad
related to: examples attenuation evidence
Search results
Results From The WOW.Com Content Network
The canonical example of attenuation used in many introductory genetics textbooks, [1] is ribosome-mediated attenuation of the trp operon. Ribosome-mediated attenuation of the trp operon relies on the fact that, in bacteria, transcription and translation proceed simultaneously. Attenuation involves a provisional stop signal (attenuator ...
Attenuation theory, also known as Treisman's attenuation model, is a model of selective attention proposed by Anne Treisman, and can be seen as a revision of Donald Broadbent's filter model. Treisman proposed attenuation theory as a means to explain how unattended stimuli sometimes came to be processed in a more rigorous manner than what ...
The trp operon additionally uses attenuation to control expression of the operon, a second negative feedback control mechanism. The trp operon is well-studied and is commonly used as an example of gene regulation in bacteria alongside the lac operon.
The American doctrine of the fruit of the poisonous tree has generally been rejected by the courts and legislators in Australia. Courts have tended to reject evidence where there is serious risk of unreliability, but where evidence is obtained unlawfully or improperly, the interest in deterring the police from unlawful, improper, or unfair treatment of the accused is balanced against the ...
The discovery of attenuation was significant as it represented a regulatory mechanism distinct from repression. [22] [23] The trp operon is regulated by both attenuation and repression, and was the first evidence that gene expression regulation mechanisms can be overlapping or redundant. [17]
In the United States, the exclusionary rule is a legal rule, based on constitutional law, that prevents evidence collected or analyzed in violation of the defendant's constitutional rights from being used in a court of law. This may be considered an example of a prophylactic rule formulated by the judiciary in order to protect a constitutional ...
Moreover, allocation of attention is a product of both voluntary and reflexive attention. Goals and behaviors drive attention but may be influenced by an exogenous stimulus of particular stimulus strength, which varies by situation. Such research evidence confirms Broadbent's notion of voluntary attentional mechanisms. [14]
For example, one study [12] used serial passage in baboons to create a strain of HIV-2 that is particularly virulent to baboons. Typical strains of HIV-2 only infect baboons slowly. [ 12 ] This specificity makes it challenging for scientists to use HIV-2 in animal models of HIV-1, because the animals in the model will only show symptoms slowly.