Endemic goitre and plasmatic levels of vitamins A and E in the school-children on the island of Krk, Croatia.

A total of 1975 school-children on the island of Krk aged 7-19 years of life were included in this study. The purpose was to establish the goitre status and plasmatic level of vitamins A and E in the examined children with the enlarged thyroid gland. The goitre prevalence was 29.8%. The average plasmatic values of vitamins A and E in the children with enlarged thyroids were statistically significantly lower from the reference values. Mentioned goitre prevalence at the level of moderate and heavier endemic goitre speaks on behalf of alimentary iodine deficiency. But the goiter examinations suggested the idoine deficiency not to be the only etiological factor of goitre on the island of Krk. Lower average plasmatic values of vitamins A and E in the examined with the enlarged thyroids referred to this fact to a certain degree.

Allozyme frequencies in New Jersey and North Carolina populations of Atlantic white-cedar, Chamaecyparis thyoides (Cupressaceae).

The present study was conducted to assess the distribution of genetic variation within and among populations of Chamaecyparis thyoides in both marginal and centrally located populations. Allozyme frequency analyses of ten loci from foliage of four New Jersey populations and two North Carolina populations of C. thyoides showed polymorphic loci = 50%, mean number of alleles per locus = 2.8, effective number of alleles per locus = 1.17, and expected heterozygosity = 0.14. Diversity was highest in two populations from southern New Jersey. The isolated population at High Point, New Jersey had only two polymorphic loci and expected heterozygosity of 0.03. There was no correlation between genetic and geographic distances among populations, implying that cedar must have possessed some means of long-distance dispersal at the end of the last glacial period, rather than advancing northward step by step.