Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 44

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  cyna
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
This paper presents the results of study on the toxic action mechanism of organic derivatives of tin (IV) on black lipid membrane (BLM) as a model of cell membrane. Trimethyltinchloride, tripropyltinchloride, tributyltinchloride, triphenyltinchloride, dimethyltindichloride, dipropyltinchloride, dibutyltin- dichloride, diphenyltindichloride were tested. The compounds were selected to determine the role of their structural elements in the mechanism studied. The measurements were made for the concentrations of investigated compounds ranging from 0 to 12x 10-7 mol/L, i.e. within the range of toxic concentrations, causing the BLM depolarisation. The effects of compounds studied on BLM were strongly dependent on their concentration and structure, which the trans- membrane-potential measurements of model-membrane depolarisation (dynamics and extent) showed the most evidently. The efficiency of the interaction between the black lipid membrane and the tin (IV) derivatives increased as follows: dialkyl > trialkyl > diphenyl > triphenyl. The compounds studied were recognised as having the lipophilic properties-crucial for modification of model and biological membranes.
In this paper are presented the results of measurements determiny tin concentrations in the muscles, livers, kidneys and lungs taken from 15 cows from the voivodeship of Białystok, where small levels of environmental pollution with heavy metals were recorded and from 15 cows of the Katowice region, where significant environmental pollution with these metals were noted. The averages of these concentrations ranged: 0.025-0.040 µg/g per sample and were not dependent on the kind of sample or region. Tin concentrations in the examined organs and muscles within determined limits were not toxicologically dangerous for consumers.
Aura
|
1992
|
nr 06
12-14
Among the many complexes of organic and inorganic compounds of tin which have been applied in practice, tri-substituted organic compounds of tin such as tributylocine (TBT) are crucial in chemistry and environmental toxicology. All trisubstituted compounds of tin are strong biocides. They are used in protecting wooden construction and textiles against fungi and in fighting organisms that grow on underwater structures. The author emphasizes that the use of anti-lichen paints containing tributylocine may result in very hazardous environmental pollution.
The objective of the studies was to determine the content of tin in dog and cat feeds conserved in metal packaging and available in retail trade in Poland in 1995. Tin concentration in home feeds ranged from 0.003 to 0.0269 mg/kg of fresh mass. The lowest level of this element was found in As feed, the highest in Dogland beef feed. Foreign fodder for dogs contained this metal at a concentration from 0.001 to 0.026 mg/kg. The lowest concentration of tin was found in Rokus feed with chicken and the highest - in Chappi. In the cat fodder, the lowest concentration of tin was noted in Whiskas cans, the highest in Felix feed. On the basis of these results and data from literature, moreover, assuming similar toxicity of tin for animals, it can be stated that the content of tin in the studied fodder within the determined limits is not toxicologically dangerous for its dog and cat consumers.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.