Chemical reagents, namely, nanoparticles comprising metals, metal alloys, or both, for non-medical purposes; Diagnostic reagents, namely, nanoparticles comprising metals, metal alloys, or both, for scientific or research use; Reagents, namely, nanoparticles comprising metals, metal alloys, or both, for research purposes; Reagents, namely, nanoparticles comprising metals, metal alloys, or both, for scientific or medical research use