FDH

FDH is an acronym that can refer to several terms across different fields. The meaning depends on the context in which it is used.

In biochemistry, FDH stands for formate dehydrogenase, a family of enzymes that catalyze the oxidation of formate to carbon dioxide, typically using NAD+ or NADP+ as a cofactor. Some forms, such as FDH-H in the bacterium Escherichia coli, are components of larger electron transfer systems and participate in anaerobic energy metabolism. FDHs are studied for their roles in metabolism and for potential applications in biosensing and carbon utilization research.

In telecommunications, FDH denotes a Fibre Distribution Hub, a network facility that terminates and distributes optical fiber connections to multiple subscribers. FDHs are used in fiber-to-the-home networks and function as junction points between feeder cables and individual service drops. They commonly house splice closures, patch panels, and protective equipment, and are selected based on network topology, capacity, and resilience requirements.

In childcare, FDH may stand for Family Day Home, an in-home child care arrangement where a licensed caregiver provides care and early education to a small group of children in the provider’s residence. Family day homes are regulated by state or provincial authorities and are intended to offer a more intimate setting than large child care centers, with standards governing safety, caregiver qualifications, and caregiver-to-child ratios.

Notes: Because FDH has multiple meanings, it is important to determine the intended sense from the surrounding field or documentation.