Construction of the avian skull, as demonstrated by direct magnifying microfocal radiography (Aves)
SummaryThe new microfocus X-ray technique works with X-ray sources smaller than 10 Μm in diameter. Thus, in contrast to conventional X-ray systems, it is possible to obtain direct magnifications with high spatial resolution, i.e., well-focused radiographs with better contrast and “depth of focus”. In this connection, specific construction principles of the avian skull are elucidated, comparing several bird groups. The typical pneumatization effects are demonstrated, as are other biologically important anatomical features, in particular those of the bills/beaks as related to mechanical demands.
Physical characteristics of modern microfocus x-ray tubes.
The focal spot size of four 0.3 mm. microfocus commercial x-ray tubes was measured at various kilovoltages and tube currents using a resolution method.The implications of the variations observed are discussed in relation to clinical magnification radiography.
Repressive coping before and after diagnosis of breast cancer
Objective: The aim was to investigate to which extent emotional repression is a premorbid coping tendency of cancer patients and/or a coping response to the threat posed by a cancer diagnosis. The results of one previous study of breast cancer patients suggest the latter possibility, and our aim was to replicate and extend these findings.