Accumulation of potentially toxic elements by plants of North Caucasian Alyssum species and their molecular phylogenetic analysis.

Accumulations of potentially toxic metals were investigated in soils and five North Caucasian Alyssum species from metalliferous areas and non-metalliferous areas in Karachay-Cherkessia, Kabardino-Balkaria, Dagestan and the Krasnodar region. Analyses of field samples showed that chemical features of the soils significantly affected the concentrations of Ni, Co, Zn, but had less effect on Cu and Pb concentrations in the shoots of Alyssum. Variations in the degree of accumulating ability were found in the studied species, including hyperaccumulation of Ni in Alyssum murale (up to 12,100 mg kg), and significant accumulation of Zn in A.

[Cellular dynamics of the outer layers of the hair follicle of fine-wool sheep during the phase of stable hair growth].

The structure, origin, and migration of outer sheath cells of the hair follicles of domestic sheep were studied by electron microscopic, autoradiographic, and histochemical (glycogen) in order to understand the role of this layer in hair morphogenesis. We demonstrated that the cells of the outer layers of the outer sheath interpose into the inner "companion" layer of the outer sheath. Although this process takes place all along the hair follicle from the lower bulb up to the sebaceous glands orifices, it mainly takes place over the bulb.

[The effect of methyl-containing supplements during pregnancy on the phenotypic modification of offspring hair color in rats].

The effect of methyl supplements to the diet of pregnant homozygous (AAHH) female rats with agouti coat color mated with homozygous (aahh) males on the phenotypic modification of the coat color of their heterozygous offspring (AaHh) has been studied. Comparative morphological analysis of the main parameters of hair that determine coat color, including the total length of hairs of different types and the length of the upper black (eumelanin) and light (pheomelanin) parts of awn hairs has been performed. The pattern of pigment granule distribution among hair layers has been analyzed.

[Morphology of hair pigmentation in wild red foxes, silver foxes, and their hybrids].

The effects of dominant allele Ar of locus Agouti on the morphology of hair pigmentation were described in foxes. The Ar allele was shown to determine the type of melanin and its content in hair with no effect on the morphology of pigment granules and their distribution throughout a hair. Using the method of electron spin resonance (ESR), the types of melanin (eumelanin and pheomelanin) and their content in the hair of red (ArArEE) and silver (aaEE) foxes and their hybrids (AraEE) were determined.

[Variability of pheomelanin content in wool of Karakul lambs and the problem of phenetics of color].

In samples of wool from 1,229 differently colored newborn Astrakhan lambs, the total content of melanins and the proportion of pheomelanin in the total melanin were studied by the method of electron magnetic resonance spectometry. An analysis of the corresponding computer data base revealed that the distribution of the samples with respect to the proportion of pheomelanin had at least four characteristic maximums; 1-6, 9-10, 28-29, and 39% of pheomelanin. The former two maximums were characteristic for the brown and Karakalpak sur colors, and the latter two maximums, for red-brown kambar color.