Study of the distribution of Malassezia species in patients with pityriasis versicolor and healthy individuals in Tehran, Iran

BACKGROUND: Pityriasis versicolor is a superficial infection of the stratum corneum which caused by a group of yeasts formerly named pityrosporium. The taxonomy of these lipophilic yeasts has recently been modified and includes seven species referred as Malassezia. The aim of this study is to compare the distribution of Malassezia species isolated from pityriasis versicolor lesions and those isolated from healthy skins. METHODS: Differentiation of all malassezia species performed using morphological features and physiological test including catalase reaction, Tween assimilation test and splitting of esculin. RESULTS: In pityriasis versicolor lesions, the most frequently isolated species was M. globosa (53.3%), followed by M. furfur (25.3%), M. sympodialis(9.3%), M. obtusa (8.1%) and M. slooffiae (4.0%). The most frequently isolated species in the skin of healthy individuals were M. globosa, M. sympodialis, M. furfur, M. sloofiae and M. restricta which respectively made up 41.7%, 25.0%, 23.3%, 6.7% and 3.3% of the isolated species. CONCLUSIONS: According to our data, M. globosa was the most prevalent species in the skin of healthy individuals which recovered only in the yeast form. However, the Mycelial form of M. globosa was isolated as the dominant species from pityriasis versicolor lesions. Therefore, the role of predisposing factors in the conversion of this yeast to mycelium and its subsequent involvement in pityriasis versicolor pathogenicity should be considered

Textual politics of Alabama\u27s historical markers: Slavery, emancipation, and civil rights

In light of recent protests and debates over Confederate symbols, markers, and flags after the 2015 Charleston shooting, the South remains fertile ground for critically reflecting on the role of history in shaping the present. State historical marker programs are a near ubiquitous feature of the United States\u27 commemorative landscape, used to retell history at important sites. However, geographers and other memory studies scholars have not devoted much time or effort in researching historical markers, in part because they are often considered mundane or they are ignored in favor of researching stand-alone monuments or other memory projects. Engaging with textual politics-the belief that language, words, and narrative are politically active within commemorative landscapes-along with the concepts of historical responsibility and surrogation, this chapter presents an analysis of the Alabama Historical Association\u27s marker program and its presentation and interpretation of African-American history. Findings include that historical periods of slavery and emancipation have largely been ignored, while the Civil Rights Movement is more widely represented and celebrated as a success story