https://www.selleckchem.com/ Hydrogen is a clean and sustainable form of fuel that can minimize our heavy dependence on fossil fuels as the primary energy source. The need of finding greener ways to generate H 2 gas has ignited interest in the research community to synthesize catalysts that can produce H 2 gas by the reduction of H + . The natural H 2 producing enzymes hydrogenases have served as an inspiration to produce catalytic metal centers akin to these native enzymes. In this article we describe recent advances in the design of a unique class of artificial hydrogen evolving catalysts that combine the features of the active site metal(s) surrounded by a polypeptide component. The examples of these biosynthetic catalysts discussed here include i) assemblies of synthetic cofactors with native proteins; ii) peptide-appended synthetic complexes; iii) substitution of native cofactors with non-native macrocyclic cofactors; iv) metal substitution from rubredoxin; and v) a reengineered Cu storage protein into a Ni binding protein. Aspects of key design considerations in the construction of these artificial biocatalysts and insights gained into their chemical reactivity are discussed.In early 2020, the first US and Canadian cases of the novel SARS-CoV-2 infection were detected. In the ensuing months, there has been rapid spread of the infection. In March 2020, in response to the virus, state/provincial and local governments instituted shelter-in-place orders, and non-essential ambulatory care was significantly curtailed, including allergy/immunology services. With rates of new infections and fatalities potentially reaching a plateau and/or declining, restrictions on provision of routine ambulatory care are lifting, and there is a need to help guide the allergy/immunology clinician on how to re-initiate services. Given COVID-19 will circulate within our communities for months or longer, we present a flexible, algorithmic best-practices planning approach on how to priori