Distinct molecules called agglutinogens (a type of antigen) are attached to the surface of red blood cells. There are two different types of agglutinogens, type A and type B. Each type has different properties.
MDB: Geodatabase. The geodatabase is a collection of geographic datasets of various types, with the most basic types being vector, raster, and tabular data. There are three types of geodatabases: file, personal, and ArcSDE. Geodatabases are the native data format for ESRI's ArcGIS.
By default, the log files are written to <installation_location>\server\user\log on every machine. Each time ArcGIS Server restarts, new log files are created, and the server will continue to write messages to those log files until they reach the maximum log size.