Investigating the relationship between mild traumatic brain injury and Alzheimer's disease and related dementias: a systematic review.

The objective of this systematic review is to synthesize the relevant literature published after 2016 to ascertain the current landscape of science that relates mild traumatic brain injury (mTBI) to the onset of Alzheimer's disease and related dementias (ADRD) and identify areas of need for future research. We conducted database searches and retrieved articles that were published after 2016 that utilized cognitive assessments to understand the relationship between mTBI and ADRD. We identified eight relevant articles in the review process, four of which presented a significant relationship between mTBI and disease or cognitive impairment outcomes.

Fluorescence Quenching of Carbonyl-Twisted 5Acyl-1-dimethylaminonaphthalenes by Alcohols.

Derivatives of 1-dimethylamino-5-propionylnaphthalene that constrain the carbonyl group into a five-, six-, and seven-membered ring were prepared, and their fluorescence quenching in protic solvents was studied. Evidence for enhanced quenching due to carbonyl twisting out of the molecular plane is presented, but this effect is heavily masked by the strong quenching by all of the derivatives and by the ring size-dependent deactivation seen in polar, aprotic solvents. Calculations show strong, ring size-dependent vibrational coupling between the carbonyl group and the naphthalene ring in the first excited state.