Blood counting machines aspirate a very small amount of the specimen through narrow tubing followed by an aperture and a laser flow cell. Laser eye sensors count the number of cells passing through the aperature, and can identify them; this is flow cytometry.
In computing, Extract, Transform and Load (ETL) refers to a process in database usage and especially in data warehousing that performs: Data extraction â extracts data from homogeneous or heterogeneous data sources.
EDW is a set of tools to build applications that deal with information, such as front-ends for Data Warehouses. ETL: extracting, consolidating, cleaning, converting, importing data from a number of heterogeneous sources into the database.