OBJECTIVE This paper describes recent advances in the neurobiology of mental retardation, emphasizing new diagnostic resources provided by cytogenetics, molecular testing, and neuroimaging. SOURCES OF DATA MEDLINE (January 2000 through October 2003), using the following key words: mental retardation, developmental disability, child, and adolescent. Search of the Pediatrics and New England Jou...

The theory predicts that the spin-wave lifetime τL and the linewidth of ferromagnetic resonance ∆B can be governed by random fields and spatial memory. To that aim the effective field around which the magnetic moments perform a precession is superimposed by a stochastic time dependent magnetic field with finite correlation time. The magnetization dynamics is altered by inclusion of a spatial me...

The aim of this paper is to clarify which kinds of retardation foils are most suited to extend the viewing angle of π-cells [1]. For this reason we focussed on the simulated conoscopic retardation plots of the π-cell on the one hand and of the retardation foils on the other hand. Among the foils we investigated are hybrid retardation layers with positive and negative birefringence, homogeneous ...

the hereditary ataxias are a group of genetically defined neurological diseases which are characterized by heterogeneous clinical presentations. ataxia is defined as imbalance and lack of coordination. mental retardation associated with ataxia has been reported in some of the known and recently identified syndromes. in this review, we describe some known and novel genes that cause familial ment...

Aim To compare the frequency of mental retardation with other psychiatric disorders at the Institute for Mentally Disabled Persons "Drin" Fojnica, Bosnia and Herzegovina, to asses psychosocial condition and necessary support to persons with mental retardation. Methods In this retrospective, descriptive and epidemiologic study neuropsychiatric findings and reports of the Institute's social servi...

Abstract Introduction Placenta is the maternal–foetal contact zone. The placentas of ‘idiopathic’ intrauterine growth retardation babies may hold the key to the aetiology of growth restriction. It was noted by most workers that in cases of intrauterine growth retardation placentas, there were some abnormal positions of insertion of umbilical cords, placental weight and volume was significantly ...

In this study, in order to investigate crack retardation behavior and the variability of retardation cycles, crack growth tests are conducted on 7075-T6 aluminum alloy under a single tensile overload. A retardation coefficient D is introduced herein as the ratio of the crack growth rate under constant amplitude loading and the crack growth rate after an overload. This coefficient D is separatel...

Non-syndromic mental retardation is one of the most serious neurodevelopmental disorders, which has a serious impact not only on the affected individuals and their families but also on the health care system and society. Previously research has been more focused on the X-linked mental retardation and only recently studies have shown that non-syndromic autosomal recessive mental retardation is e...