Half sphere exposure Half sphere exposure Half Sphere Exposure (HSE) is a protein solvent exposure measure that was first introduced by . Like all solvent exposure measures it measures how buried amino acid residues are in a protein. It is found by counting the number of amino acid neighbors within two half spheres of chosen radius around the amino acid. The calculation of HSE is found by dividing a contact number (CN) sphere in two halves by the plane perpendicular to the Cβ-Cα vector. This simple division of the CN sphere results in two strikingly different measures, HSE-up and HSE-down. HSE-up is defined
Science On a Sphere have conducted their own evaluation reports as well to better understand the educational impacts of Science On a Sphere. Science On a Sphere is installed in science museums, zoos and aquariums, and visitors centers around the world. New sites are continually being added: In 2005, the NASA Goddard Space Flight Center ordered what would become the eighth SOS to be permanently installed. Michael Starobin, Goddard's senior media producer at the time, began the process of developing a presentation that would showcase NASA data. Through the autumn of 2005 and into the winter of 2006, Starobin worked on collecting source material