There are three main types of metadata: â¢ Descriptive metadata describes a resource for purposes such as discovery and identification.It can include elements such as title, abstract, author, and keywords. â¢ Structural metadata indicates how compound objects are put together, for example, how pages are ordered to form chapters.â¢ Administrative metadata provides information to help manage a resource, such as when and how it was created, file type and other technical information, and who can access it. Structural metadata indicates how compound objects are put together, for example, how pages are ordered to form chapters. â¢ Administrative metadata provides information to help manage a resource, such as when and how it was created, file type and other technical information, and who can access it.
Sabinâs live-virus, oral polio vaccine (administered in drops or on a sugar cube) soon replaced Salkâs killed-virus, injectable vaccine in many parts of the world.
Aluminum-hydroxide in vaccines causes serious health problems By Tenna Merchent. Gruis KL, Teener JW, Blaivas M., Pediatric macrophagic myofasciitis associated with motor delay, Clin Neuropathol. 2006 Jul-Aug; 25(4):172-9. Aluminum-hydroxide in vaccines causes serious health problems.By Tenna Merchent. There are three basic aluminum salts used in vaccines: aluminum hydroxide, aluminum phosphate and potassium-aluminum sulfate, or alum. The three forms are not interchangeable as they each have their own chemical properties.luminum-hydroxide in vaccines causes serious health problems By Tenna Merchent. Gruis KL, Teener JW, Blaivas M., Pediatric macrophagic myofasciitis associated with motor delay, Clin Neuropathol. 2006 Jul-Aug; 25(4):172-9. Aluminum-hydroxide in vaccines causes serious health problems.