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.
Currently, computed tomography enterography (CTE) and magnetic resonance enterography (MRE) are the only 2 imaging modalities that can visualize submucosal tissues throughout the small bowel. CT generally is highly utilized, but there is growing concern over ionizing radiation and cancer risk. In contrast to CTE, MRE does not expose patients to ionizing radiation, and it can differentiate between inflammation and fibrosis as the cause of submucosal inflammation (Table 1).