Figure 5.

“Word clouds” of select terms from the titles of papers published in Blood in 1946, 1956, 1966, 1976, 1986, 1996, 2006, and 2014. The size of the term reflects the number of times it appeared in titles. In cases where two terms were very closely related (eg, “platelet” and “platelets”), the total of the two was used for the analysis and one of the two terms was selected for representation. Some terms were omitted when they did not convey specific information related to the development of hematology. Because the number of papers published in each year represented differed significantly, the number of replicates needed to be represented in the “word cloud” differed. The minimum of replicates each year required for inclusion were: 1946, 2; 1956, 3; 1966, 3; 1976, 5; 1986, 9; 1996, 23; 2006, 25; and 2014, 17. The numbers of replicates in the top-ranked terms were: 1946, 6; 1956, 19; 1966, 13; 1976, 42; 1986, 107; 1996, 200; 2006, 207; and 2014, 182. The terms are color-coded to reflect the broad disciplines: red for RBC biology and disorders; white for WBC biology and disorders; yellow for hemostasis, thrombosis, and vascular biology; pink for hematopoiesis-related topics, including transplantation; and green for terms that cut across topics.