Category: R

A translucent lead glass window in a radiographic control booth. Within the control booth, an integral component manifests as a lead-infused glass window, possessing the remarkable quality of light transmittance. This distinctive attribute enables the operator to visually observe the patient, while simultaneously providing robust shielding against potentially harmful alpha, beta, gamma, and/or x-ray radiation.…

A virus such as the human immunodeficiency virus, influenza virus, and polio virus whose genome is ribonucleic acid (RNA).  

A virus whose genetic material has been recombined or reshuffled so that it contains new nucleic acid sequences, new antigenic structures, and new combinations of protein products.  

A vein that drains blood from the forearm and the hand and joins the brachial vein.  

Blood vessel dilation caused by stimulation of its dilator nerves or inhibition of its constrictor substance or nerves. This can be done by stimulating the sensory reflex arc.  

The inflammation that occurs when antigen-antibody complexes are deposited on the walls of small blood vessels in transplanted organs. Although the transplant rejection process is dominated by T-cell- mediated activities, antibodies also may form against the histocompatibility antigens on the transplanted organ and compromise its viability.  

A device to reduce the pressure of gas that has been compressed in a cylinder.  

A vacuole present in the cytoplasm of a secretory cell that is filled with colloid material.  

A vaccine made by combining antigens from several viruses or from several strains of the same virus.  

A vaccine prepared from killed rabies virus used for pre-exposure immunization for persons at high occupational risk. Following a bite by a rabid animal, both the vaccine and rabies immune globulin, containing preformed antibodies, are given.