By virtue of their open network structures and low densities, metal-organic frameworks (MOFs) are soft materials that exhibit elastic instabilities at low applied stresses. The conventional strategy for improving elastic stability is to increase the connectivity of the underlying MOF network, which necessarily increases the material density and reduces the porosity. Here we demonstrate an alternative paradigm, whereby elastic stability is enhanced in a MOF with an aperiodic network topology.
View Article and Find Full Text PDFObjective: To assess whether A level grades (achievement) and intelligence (ability) predict doctors' careers.
Design: Prospective cohort study with follow up after 20 years by postal questionnaire.
Setting: A UK medical school in London.