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John Allen Clements (March 16, 1923 – September 3, 2024) was an American physician and physiologist known for his role in the discovery of pulmonary surfactant, a crucial factor in the development of life-saving treatments for neonatal respiratory distress syndrome. His research revolutionized the care of premature infants, greatly reducing ...
Polycythemia vera (PCV) (a.k.a. polycythemia rubra vera (PRV)) occurs when excess red blood cells are produced as a result of an abnormality of the bone marrow. [3] Often, excess white blood cells and platelets are also produced. A hallmark of polycythemia vera is an elevated hematocrit, with Hct > 55% seen in 83% of cases. [20]
Polycythemia vera (PV) is associated most often with the JAK2 V617F mutation greater than 95% of cases, whereas the remainder has a JAK2 exon 12 mutations. High hemoglobin or hematocrit counts are required, as is a bone marrow examination showing "prominent erythroid , granulocytic and megakaryocytic proliferation with pleomorphic, mature ...
In oncology, polycythemia vera (PV) is an uncommon myeloproliferative neoplasm in which the bone marrow makes too many red blood cells. [1] The majority of cases [2] are caused by mutations in the JAK2 gene, most commonly resulting in a single amino acid change in its protein product from valine to phenylalanine at position 617.
Secondary erythromelalgia can result from small fiber peripheral neuropathy of any cause, polycythemia vera, essential thrombocythemia, [1] hypercholesterolemia, mushroom or mercury poisoning, and some autoimmune disorders. Primary erythromelalgia is caused by mutation of the voltage-gated sodium channel α-subunit gene SCN9A.
This is an incomplete list, which may never be able to satisfy certain standards for completion.. There are many conditions of or affecting the human hematologic system—the biological system that includes plasma, platelets, leukocytes, and erythrocytes, the major components of blood and the bone marrow.
Allen makes this case to the leader of the Coalition, Thaedus (voiced by Transformers icon Peter Cullen), who seems to be somewhat on board. We also learn about Allen's personal life.
John Edward Allen (born 6 December 1928, Devonport, England) is a British engineer and plasma physicist. [1] In particular, he has directly contributed to international dusty plasma experiments in space under microgravity conditions.