photovoltaic-thermal (PV/T) system â A photovoltaic system that, in addition to converting sunlight into electricity, collects the residual heat energy and delivers both heat and electricity in usable form. Also called a total energy system or solar thermal system.olar cooling â The use of solar thermal energy or solar electricity to power a cooling appliance. Photovoltaic systems can power evaporative coolers (swamp coolers), heat-pumps, and air conditioners.
HEPATITIS B VACCINATION The first hepatitis B vaccine became commercially available in the United States in 1982. In 1986, a hepatitis B vaccine produced by recombinant DNA technology was licensed and a second recombinant-type hepatitis B vaccine was licensed in 1989.
Hepatitis A. By John W. Wood. Hepatitis A is referred to as one of the oldest diseases known to humankind by the World Health Organization (WHO) (1). HAV was first discovered in 1973 by Steven M. Feinstone as a nonenvoloped, spherical, positive stranded RNA virus (1).HAV was an unidentified viral disease prior to this discovery.Hepatitis A is a disease caused by infection from the hepatitis A virus (HAV) (1, 5, 8).HAV has been called epidemic hepatitis, epidemic jaundice, infectious hepatitis, catarrhal jaundice, HA and type A hepatitis in the past according to the WHO (1). The term hepatitis refers to having inflammation of the liver.AV was first discovered in 1973 by Steven M. Feinstone as a nonenvoloped, spherical, positive stranded RNA virus (1). HAV was an unidentified viral disease prior to this discovery. Hepatitis A is a disease caused by infection from the hepatitis A virus (HAV) (1, 5, 8).