The design, development and documentation of software. See software engineer, systems analysis & design, programming, object-oriented programming, software metrics, CASE and Systemantics.
Overview. Posttransplant lymphoproliferative disease (PTLD) is an unusual entity that has many features of an immune system malignancy. It is characterized by uncontrolled proliferation of lymphoid lineage cells (typically B cells, rarely non-B lineage) in a context of posttransplant immunosuppression.
PTFE is used as a non-stick coating for pans and other cookware. It is very non-reactive, partly because of the strength of carbonâfluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals.