It the present study the effects of gamma-radiation at doses of 102.1 Gy-1,633.4 Gy were investigated as exerted on the protozoan Tetrahymena pyriformis W strain. An investigation of lethality showed that all irradiated cells survived after the doses of 102.1 Gy and 204.2 Gy, When the doses of 408.4 and 816.7 Gy were applied, 60.6% and 8.8%, resp., of irradiated cells survived. Not a cell survived the dose of 1,633.4 Gy. The effects of gamma-radiation on the generation time of Tetrahymena pyriformis are shown in Tab. II. A markedly longer generation time than in the control was observed if the radiation doses made 408.4 and 816.7 Gy. There were no significant changes there when the effects of irradiated incubation media on the growth of nonirradiated cells of the W strain of Tetrahymena pyriformis were investigated. The results confirmed the relatively high radioresistance of the Tetrahymena protozoon with respect to gamma-radiation; this protozoan is a suitable biological model for a study of the effects of various kinds of ionizing radiation at the level of both cell and population.

• MeSH
• Tetrahymena pyriformis účinky záření   MeSH
• záření gama MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH

• MeSH
• absorpce MeSH
• cesium * MeSH
• dekontaminace * MeSH
• radioaktivní znečišťující látky * MeSH
• stroncium * MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH
• Názvy látek
• cesium * MeSH
• radioaktivní znečišťující látky * MeSH
• stroncium * MeSH

Observation was made of the influence of natural zeolite (clinoptilolite) supplement in food on 134Cs excretion and distribution after oral internal contamination of laboratory brown rats. After diet administration with 2.5, 5, and 10% zeolite supplement the 134Cs elimination in droppings increased and the radionuclide deposition in liver, kidneys and femoral musculature decreased. The zeolite decontamination effects were observed with preventive administration, as well as with sorbent administration from the 24th hour after a single internal contamination.

• MeSH
• inbrední kmeny potkanů MeSH
• krysa rodu Rattus MeSH
• radioizotopy cesia farmakokinetika   MeSH
• silikáty hliníku farmakologie   MeSH
• zeolity MeSH
• zvířata MeSH
• Check Tag
• krysa rodu Rattus MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• radioizotopy cesia MeSH
• silikáty hliníku MeSH
• zeolity MeSH

Specific activities of 134Cs, 137Cs were investigated and compared in canned meat products, pork, beef, poultry, venison, as well as in raw cow milk, milk products and milk replacers. Increased specific activities of cesium radionuclides in canned meat products were found up to 70 Bq.kg-1 in 1986, up to 150 Bq.kg-1 early in 1987, and a gradual decline of specific activity to 40 Bq.kg-1 at the end of 1988. In 1987 these values made up to 50 Bq.kg-1 and 120 Bq.kg-1 in pork and beef, up to 30 Bq.kg-1 in poultry, and up to 160 Bq.kg-1 in venison. In 1988 a decrease in these specific activities occurred down to 30 Bq.kg-1. The values of 134,137Cs specific activity did not exceed 10 Bq.kg-1 in raw cow milk, and 30 Bq.kg-1 in milk products. Specific activity up to 200 Bq.kg-1 was found in milk replacers.

• MeSH
• analýza potravin * MeSH
• maso analýza   MeSH
• mléko analýza   MeSH
• radioaktivní kontaminace potravin * MeSH
• radioizotopy cesia analýza   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• radioizotopy cesia MeSH

The toxic action of selected mycotoxins on a biological subject was tested in the protozoan Tetrahymena pyriformis. The following toxins were tested: toxin T-2 at doses from 1.52 micrograms to 100.0 mg per litre of medium, ochratoxin A at doses from 12.21 micrograms to 800.0 mg per litre of medium, and rubratoxin B at doses from 12.21 micrograms to 800.0 mg per litre of medium. In toxin T-2 the LD100 was found to be about 390.63 micrograms and LD50 about 48.83 micrograms per litre of medium. In ochratoxin A the LD100 was about 25.0 mg and LD50 about 3.13 mg per litre of medium. In rubratoxin B the LD100 was about 200.0 mg and LD50 about 25.0 mg per litre of medium.

• MeSH
• biotest metody   MeSH
• LD50 MeSH
• mykotoxiny analýza   toxicita   MeSH
• ochratoxiny analýza   toxicita   MeSH
• T-2 toxin analýza   toxicita   MeSH
• Tetrahymena pyriformis účinky léků   MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• mykotoxiny MeSH
• ochratoxin A MeSH Prohlížeč
• ochratoxiny MeSH
• T-2 toxin MeSH

In the first series of trials, the physiological values of tissue cholinesterases were determined in the male rats of the Wistar strain. In the second series of trials the rats were perorally intoxicated with dichlorvos at the doses of 200.0, 128.0, 81.9, 65.5 and 52.4 mg per kg live weight. The objective of the trials was to examine the distribution of dichlorvos in the body of a rat on the basis of tissue cholinesterase inhibition. A marked decrease in the level of tissue cholinesterases was recorded at all the dichlorvos doses. In the third series of trials the protective effect of clinoptilolite was verified; clinoptilolite as a sorbent of natural origin has been administered per os at the dose of 1.0 g per kg live weight just before the intoxication with dichlorvos. The results document a marked protective effect of clinoptilolite on most of the tissues studied.

• MeSH
• cholinesterasy metabolismus   MeSH
• dichlorvos metabolismus   otrava   MeSH
• inbrední kmeny potkanů MeSH
• krysa rodu Rattus MeSH
• silikáty hliníku farmakologie   MeSH
• tkáňová distribuce MeSH
• zeolity MeSH
• zvířata MeSH
• Check Tag
• krysa rodu Rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• cholinesterasy MeSH
• dichlorvos MeSH
• silikáty hliníku MeSH
• zeolity MeSH