Problems and pitfalls in the diagnosis of linear enamel hypoplasia in cheek teeth of cattle

Prevalence and intensity of enamel hypoplasia have been used as markers of generalized physiological stress during dental development in a wide range of mammalian taxa. We studied cattle (Bos taurus) cheek teeth exhibiting morphological characteristics that are of relevance to the diagnosis of enamel hypoplasia in this and other bovid species. These characteristics were multiple, more or less horizontally arranged (waveform) lines or grooves in the cementum of the tooth crown and the adjacent root area, leading to an imbricated appearance of the cementum. On macroscopic examination of tooth surfaces, these lines resembled linear enamel hypoplasia (LEH). Microscopic analysis of tooth sections, however, revealed that the lines occurred in the cementum only, and that the underlying enamel did not exhibit morphological irregularities. In cheek teeth of older cattle, a thick cementum layer is regularly found in the cervical crown portion and the adjacent root area. Apposition of this cementum is related to the uplifting of the teeth from their alveoli, a process that compensates for the shortening of the tooth crowns due to occlusal wear. In the studied specimens, a pronounced periodic nature of tooth uplifting and the related deposition of cementum is the likely cause for the observed imbricated appearance of the cementum. While this phenomenon may be misinterpreted as representing a case of LEH, presence of enamel hypoplasia in bovid teeth may be overlooked when the defects become filled with coronal cementum and are therefore not apparent on external inspection. This was the case in one of the cattle teeth analyzed by us, in which the hypoplastic enamel defects were, however, clearly discernible in ground sections. Microscopic analysis of tooth sections is recommended for recording of LEH in bovid teeth in cases where macroscopic examination of tooth surfaces alone does not produce unequivocal results.     

Sigmund Freud und die Lauterkeit

In his carrier as physician, Sigmund Freud claimed various and surprising successes in healing patients. An evaluation of those cases in which evidence independent of Freud's publications has been discovered reveals a lifelong pattern of Freud claiming successes, patients, however, not being cured, and Freud being aware of this. The elements of this pattern are matched with the components of the legal definition of fraud.     

Between Large-N and Small-N Analyses: Historical Comparison of Thirty Insurgency Case Studies

Abstract

The authors study the 30 insurgencies occurring between 1978 and 2008 using four methods crossing the qualitative/quantitative divide. The four approaches are narrative, bivariate comparison, comparative qualitative analysis, and K-medoids clustering. The quantification of qualitative data allows the authors to compare more cases than they could “hold in their heads” under a traditional small-n qualitative approach, improving the quality of the overall narrative and helping to ensure that the quantitative analyses respected the nuance of the detailed case histories. Structured data-mining reduces the dimensionality of possible explanatory factors relative to the available observations to expose patterns in the data in ways more common in large-n studies. The four analytic approaches produced similar and mutually supporting findings, leading to robust conclusions.     

Struggles for the Folk. Politics of Culture in Czechoslovak Ethnography, 1940s–1950s

Focusing on politics of culture in early socialist era, this article explores struggles for imposing particular visions of “folk” during the revolutionary zeal characterizing the post-1948 period's development in the discipline of Czechoslovak ethnography. It examines the self-proclaimed turn from previous ethnographic traditions, accused of bourgeois nationalism, to socialist orientation towards studying “true folk”. By tracing struggles around the re-conceptualization of constitutive criteria and boundaries defining the essential object of ethnographic inquiry, the socialist ethnographers readjusted to the changes by focusing on more “progressive” traditions and shifted towards the “working-class” seen as possessing revolutionary spirit and the true authentic essence of the nation. The article argues that the new ethnographic wave ultimately re-inscribed the essentialist categories they virtually combatted by embedding them within the same structural framework rooted in the national order of things.