Quantum interference effects elucidate triplet-pair formation dynamics in intramolecular singlet-fission molecules.

Quantum interference (QI)-the constructive or destructive interference of conduction pathways through molecular orbitals-plays a fundamental role in enhancing or suppressing charge and spin transport in organic molecular electronics. Graphical models were developed to predict constructive versus destructive interference in polyaromatic hydrocarbons and have successfully estimated the large conductivity differences observed in single-molecule transport measurements. A major challenge lies in extending these models to excitonic (photoexcited) processes, which typically involve distinct orbitals with different symmetries.

Profile of Patients Hospitalized for Heart Failure Who Leave Against Medical Advice.

Background: There is a paucity of information on patients hospitalized with heart failure (HF) who leave against medical advice (AMA). We sought to identify patient and hospital characteristics and outcomes of patients with HF who left AMA compared with those conventionally discharged to home.

Methods And Results: Using the Get With The Guidelines-Heart Failure registry, data were analyzed from January 2010 to June 2019.

Wave Function Based Analysis of Dynamics versus Yield of Free Triplets in Intramolecular Singlet Fission.

Experiments in several intramolecular singlet fission materials have indicated that the triplet-triplet spin biexciton has a much longer lifetime than believed until recently, opening up loss mechanisms that can annihilate the biexciton prior to its dissociation to free triplets. We have performed many-body calculations of excited state wave functions of hypothetical phenylene-linked anthracene molecules to better understand linker-dependent behavior of dimers of larger acenes being investigated as potential singlet fission candidates. The calculations reveal unanticipated features that we show carry over to the real covalently linked pentacene dimers.

Swimming and the heart.

Exercise training is accepted to be beneficial in lowering morbidity and mortality in patients with cardiac disease. Swimming is a popular recreational activity, gaining recognition as an effective option in maintaining and improving cardiovascular fitness. Swimming is a unique form of exercise, differing from land-based exercises such as running in many aspects including medium, position, breathing pattern, and the muscle groups used.

Troponin measurements during drug development--considerations for monitoring and management of potential cardiotoxicity: an educational collaboration among the Cardiac Safety Research Consortium, the Duke Clinical Research Institute, and the US Food and Drug Administration.

Drug-induced cardiac toxicity is a recognized challenge in development and implementation of pharmacotherapy. Appropriate biomarkers are needed to detect these abnormalities early in development and to manage the risk of potentially cardiotoxic drugs or biologic agents. Circulating cardiac troponin (cTn) is the most widely used biomarker for detection of myocardial injury.