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    The effects of linear models assumed for the analysis of environmental sources of variation upon parameter estimates .1. Models and environmental parameters
    (Scientific Technical Research Council Turkey, 1997) Vanli, Y; Orhan, H; Bas, S
    The production records of Merino lambs used in this study had been collected during a period of 16 years. The result obtained from the analysis of environmental factors can be summarised as (i) an important part of teh phenotypic variation observed on birth and weaning characteristics can be attributed to the effects of measurable environmental factors, (ii) the environmental factors investigated caused more variation on quantitative measurement, than that of the scored values, (iii) the constant estimates for the age of dam, sex of lamb and type of birth or rearing showed higher values by the analysis of Model 4 from which birth weight as a covariable was removed, (iv) the level of significance of some environmental factors was depended upon the mathematical models assumed. Consequently, statistical control and adjustment for certain environmental causes of phenotypic variation was found significant for selecting the lambs at weaning with respect to the characteristics under consideration.
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    Spitzoid melanoma in childhood
    (John Libbey Eurotext Ltd, 2006) Top, H; Aygit, AC; Bas, S; Yalcin, O
    Spitzoid melanoma is a rare variant of melanoma. It has morphological features similar to those of Spitz's nevus. In this study, the histologic and immunohistochemical features of both Spitzoid melanoma and Spitz's nevus are emphasized. We report two cases of melanoma with spitzoid features occurring in the extremities of 9 and 8-year-old girls. Histologically both lesions had typical features of Spitzoid melanoma. We conclude that the differential diagnosis of Spitzoid melanoma and Spitz's nevus is at times problematic in childhood, in that distant metastasis may be the only diagnostic criteria for some cases to be distinguished from Spitz's nevus if strict criteria are followed. Spitzoid melanoma must be treated as other types of melanoma.