We report a female newborn baby who presented with vomiting and abdominal distension on day 21 of life. Examination revealed facial puffiness, open posterior fontanelles, dry skin, cold peripheries and prominent abdominal veins with visible peristalsis. Barium enema revealed dilated proximal colon, empty rectum, funnel like transition zone between proximal dilated and distal constricted bowel. ...

Absorption of L-methionine was measured in all parts of the human small intestine using transintestinal intubation and perfusion. In four normal subjects, adsorption was higher in the proximal than in the distal intestine. In two patients with nontropical sprue in relapse, there was a proximal zone of low absorption with higher absorption distally. In all parts of the small intestine, absorptio...

Endovascular aneurysm repair (EVAR) of ruptured thoracoabdominal aortic aneurysms may be compromised or even impossible due to short proximal and/or distal necks or landing zones, respectively. Supra-aortic branches may limit the proximal anchorage and visceral or renal arteries the distal anchorage of endografts. While solutions have been proposed to overcome the problem of a short proximal ne...

Quantitative experimental evidence is presented for the progress zone theory of limb development. The theory, here formulated mathematically, states that the parts of the limb are specified in proximo-distal succession by an autonomous timing mechanism operating in a 'progress zone' of undifferentiated growing mesenchyme under the influence of the apical ectodermal ridge. By the exchange of dis...

As a part of a larger-scale research, the present study aimed to use the main tenets of sociocultural perspective; namely, mediation, internalization, zone of proximal development, and the activity theory, to analyze the novice and expert teachers’ professional development through personal practical theorizing as an awareness raising technique. Furthermore, the study attempted to identify the c...

This paper addresses the question of how teachers learn from experience during their pre-service course and early years of teaching. It outlines a theoretical framework that may help us better understand how teachers’ professional identities emerge in practice. The framework adapts Vygotsky’s Zone of Proximal Development, and Valsiner’s Zone of Free Movement and Zone of Promoted Action, to the ...