Aware that terminology like âmental retardationâ and âretardedâ has become derogatory, the organization changed its name to just âThe Arcâ in 1992. Back when The Arc was founded, the term âretardedâ was a sign of progress to parents of children with what we now call intellectual disabilities.
The term biological agent is defined in the Control of Substances Hazardous to Health Regulations 2002 (COSHH) and means a micro-organism, cell culture, or human endoparasite which may cause infection, allergy, toxicity or other hazard to human health.xposure to carcinogens, mutagens and biological agents. Regulation 9 requires employers and self-employed workers to report cases of occupational cancer, and any disease or acute illness caused by an occupational exposure to a biological agent.
A co-receptor is a cell surface receptor that binds a signalling molecule in addition to a primary receptor in order to facilitate ligand recognition and initiate biological processes, such as entry of a pathogen into a host cell.erhaps the most famous and well-studied of the CCR family is CCR5 (and its near-homologue CXCR4) which acts as the primary co-receptor for HIV viral infection. The HIV envelope glycoprotein GP120 binds to CD4 as its primary receptor, CCR5 then forms a complex with CD4 and HIV, allowing viral entry into the cell.