1 Systematics : The study of the identification, taxonomy and nomenclature of organisms, including the classification of living things with regard to their natural relationships and the study of variation and the evolution of taxa.he Swedish botanist Carolus Linnaeus is regarded as the father of taxonomy, as he developed a system known as Linnaean classification for categorization of organisms and binomial nomenclature for naming organisms.
Pulmonary thromboendarterectomy. In thoracic surgery, a pulmonary thromboendarterectomy (PTE) is an operation that removes organized clotted blood (thrombus) from the pulmonary arteries. Contents. 1 Indication. 2 Description of the surgery.
Pseudoxanthoma elasticum (PXE) is an inherited disorder of the connective tissue in the skin, eyes, gastrointestinal and cardiovascular system.he skin takes on a plucked chickenâ appearance. As the disease progresses other symptoms may occur like gastrointestinal bleeding, high blood pressure, chest pain, and blood in the urine. The cause of PXE is the result of a mutation in a protein that is most abundant in the kidney and liver cells.