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Background. Since arsenic compounds have an affinity to thiol groups their greatest amounts can then be found in the tissues containing sulphur - rich proteins, like beta- keratin in skin, hair and nails. Accumulation of arsenic also depends on the macronutrient content in daily food ration. The deficiency and excess of both the protein and fat may contribute to a higher content of arsenic in the organism, including hair in human or fur in animals. Objective. Hair and fur is a good indicator of population exposure to many toxic substances, including arsenic. The degree of arsenic accumulation may depend on the diet and nutritional status. The aim of this study was to determine the effect of protein and fat in diet on the accumulation of arsenic in rats’ fur. Material and Methods. A total number of 70 male Buffalo rats (body weight 200 - 220 g, age - 6 weeks) were divided into 10 groups. Rats were housed in plastic cages (4 per cage) in a 12h light/dark cycle for 6 weeks. The diets of different protein and fat contents ware administered to the animals. Five of ten groups of rats received throughout the whole period 10 ppm sodium arsenite dissolved in distilled drinking water (about 250 μg As/animal/day). The arsenic were determined with the method of atomic adsorption spectrometry in conjunction with a graphite-furnace atomize using a Varian AA240FS apparatus. Results. The highest arsenic concentrations were found in fur of rats which were given low protein diet and water with arsenic. The lowest arsenic contents were found in fur of rats, which were given control diet and high protein diet with arsenic in water. Conclusions. Balanced control diet or high protein diet protected organism from arsenic accumulation, only small increase of arsenic content in rats’ fur, compared to the control group, was observed.
The aim of the study was to investigate into the possibility of evaluating arctic fox fur basing on the correlation of laboratory measurements of hairs collected from various parts of the coat. The material involved samples of prime fur hairs of 20 two-year-old females of the blue arctic fox, collected at the end of January. The samples were cut by the skin at six places of the body, namely: the head (between the ears), back (in the middle between the tail base and the neck base), the side (below the place of sampling located on the back), belly (mid between the base of the front limbs and the vulva), the tail (in the middle of the dorsal side), as well as the shank. The samples were subjected to macro- and microscopic measurements. The results indicate that fur coat of arctic foxes is more dense, longer, and usually more intensely colored on the back, as compared to the belly. The hairs on the head and the limbs are much shorter and contain more awn hairs. The results reveal a very weak correlation of the morphological fur characteristics between different parts of the body. It has been found that it is impossible to objectively evaluate the basic structural characteristics and the dark tops of hairs in the arctic fox on the basis of a sample of hair from a single part of the body.
Two new ectoparasitic mite species of the families Myobiidae (Prostigmata) and Myocoptidae (Astigmata) are described from Poland: Acanthophthirius (Acanthophthirius) longisetosus sp. nov. from Vespertilio murinus Linnaeus, 1758 (Chiroptera: Vespertilionidae) and Trichoecius blaszaki sp. nov. from Apodemus flavicollis (Melchior, 1834) (Rodentia: Muridae).
Badania nad wpływem dodatku do dawki koncentratu tłuszczowego na wybrane wskaźniki użytkowe norek przeprowadzono w dwóch etapach w latach 1990-1991. Pierwszy etap badań obejmował żywienie młodych norek odmiany standard w okresie od odsadzenia od samic do zakończenia wzrostu i wykształcenia zimowej okrywy włosowej. W tym celu losowo wybrane zwierzęta podzielono na dwie grupy po 20 szt. o jednakowej liczebności samców i samic. Zwierzęta grupy I (kontrolnej) żywiono dawką standardową, natomiast w dawce pokarmowej dla grupy II (doświadczalnej) śrutę jęczmienną parowaną zastąpiono koncentratem tłuszczowym. Pozostałe składniki dawki pozostały w takiej samej proporcji jak w grupie kontrolnej. Analizowano przyrosty masy ciała oraz cechy pokroju. Do drugiego etapu badań wybrano losowo po 8 samic z każdej grupy i analizowano wskaźniki plenności w pierwszym roku użytkowania rozpłodowego. Na podstawie uzyskanych wyników stwierdzono możliwość zastąpienia śruty jęczmiennej parowanej koncentratem tłuszczowym oraz brak ujemnego wpływu na badane wskaźniki użytkowe.
A group of 107 children aged from one month to 17 years was examinated. The factors causing specific symptoms were determined, together with the time of their appearance. In 87% allergic subjects the diagnosis was based on positive results of prick tests for selected allergens. The analysis of the role of various environmental factors triggering hypersensitivity reactions showed that the percentage of people allergic to food products was the greatest in the youngest age group. The work proved impact of enviromental allergens on the health of children examined.The most frequent allergens are pollens (46% examined) and fur of fur-bearing animals (45% examined). A dependence of the duration breast-feeding only upon the age of the baby was observed the moment the first symptoms of food allergy become visible.
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