The chromosome and chromatid type aberration can be induced by benzene and the dicentric and ring ones were not observed in vitro experiment but observed in vivo one. In vitro experiment a good linear regression can b...The chromosome and chromatid type aberration can be induced by benzene and the dicentric and ring ones were not observed in vitro experiment but observed in vivo one. In vitro experiment a good linear regression can be given between benzene concentrations and total aberration cells while power regression for radiation dose.The chromosome aberrations induced by benzene combined with radiation in rabbit blood lymphocytes are higher than in bone marrow cells.展开更多
Studies have been carried out to test the assumption that the primary photoreceptors for the radioprotective action of 633 nm laser radiation are the cytochrome-c-oxidases.To do this,the device was created for radiati...Studies have been carried out to test the assumption that the primary photoreceptors for the radioprotective action of 633 nm laser radiation are the cytochrome-c-oxidases.To do this,the device was created for radiation protection of biological objects based on laser module with a wavelength of 532 nm.Experiments conducted on murine fibroblast cells showed that the radioprotection effect of laser irradiation was observed in the dose interval about 0.4-0.85 mJ/cm2.Maximum radioprotection effect is observed at laser radiation energy density^0.56 mJ/cm2.The determination of the cell survival with the automatic counterСТ20 after the action of the ionizing and combined irradiation showed that radioprotective action of the laser radiation with the wavelength of 533 nm,as well as the radiation with the wavelength of 633 nm,is transferred by the mechanism of the“bystander effect”.In addition,it was found that radioprotection effect of laser irradiation observed on the criterion of number of surviving single cells,compared with cells exposed to?-radiation Laser irradiation,produces effective radioprotecting action also on the criterion of grown cell colonies.The value of the dose modification factor(DMF)calculated on 50%cell survival(LD50)is equal to 1.4.The results suggest that in the case of radioprotective action of small doses of laser radiation with a wavelength of 633 nm,as well as 532 nm primary photoreceptors is the cytochrome-c-oxidases.展开更多
Nowadays,polymer foams have a wide application area due to their light weight,emphasizing resistance to impact,high thermal insulation and damping properties,among others.So,automotive,packing industry,electronic,aero...Nowadays,polymer foams have a wide application area due to their light weight,emphasizing resistance to impact,high thermal insulation and damping properties,among others.So,automotive,packing industry,electronic,aerospace,building construction,bedding and even medical applications are some of the fields where polymer foams are applied.Foams can be classified as open and closed:Closed-cell foam is provided with tiny and discrete pockets of gas,each one totally enclosed within polymer walls;open cell foam has tiny cells which are not completely closed.In this work,LDPE(low density polyethylene)resin foamability was investigated after exposure to ionizing radiation(gamma),at 5,10 and 15 kGy.Characterizations included:melt flow index,melt strength and scanning electron microscopy.展开更多
文摘The chromosome and chromatid type aberration can be induced by benzene and the dicentric and ring ones were not observed in vitro experiment but observed in vivo one. In vitro experiment a good linear regression can be given between benzene concentrations and total aberration cells while power regression for radiation dose.The chromosome aberrations induced by benzene combined with radiation in rabbit blood lymphocytes are higher than in bone marrow cells.
文摘Studies have been carried out to test the assumption that the primary photoreceptors for the radioprotective action of 633 nm laser radiation are the cytochrome-c-oxidases.To do this,the device was created for radiation protection of biological objects based on laser module with a wavelength of 532 nm.Experiments conducted on murine fibroblast cells showed that the radioprotection effect of laser irradiation was observed in the dose interval about 0.4-0.85 mJ/cm2.Maximum radioprotection effect is observed at laser radiation energy density^0.56 mJ/cm2.The determination of the cell survival with the automatic counterСТ20 after the action of the ionizing and combined irradiation showed that radioprotective action of the laser radiation with the wavelength of 533 nm,as well as the radiation with the wavelength of 633 nm,is transferred by the mechanism of the“bystander effect”.In addition,it was found that radioprotection effect of laser irradiation observed on the criterion of number of surviving single cells,compared with cells exposed to?-radiation Laser irradiation,produces effective radioprotecting action also on the criterion of grown cell colonies.The value of the dose modification factor(DMF)calculated on 50%cell survival(LD50)is equal to 1.4.The results suggest that in the case of radioprotective action of small doses of laser radiation with a wavelength of 633 nm,as well as 532 nm primary photoreceptors is the cytochrome-c-oxidases.
文摘Nowadays,polymer foams have a wide application area due to their light weight,emphasizing resistance to impact,high thermal insulation and damping properties,among others.So,automotive,packing industry,electronic,aerospace,building construction,bedding and even medical applications are some of the fields where polymer foams are applied.Foams can be classified as open and closed:Closed-cell foam is provided with tiny and discrete pockets of gas,each one totally enclosed within polymer walls;open cell foam has tiny cells which are not completely closed.In this work,LDPE(low density polyethylene)resin foamability was investigated after exposure to ionizing radiation(gamma),at 5,10 and 15 kGy.Characterizations included:melt flow index,melt strength and scanning electron microscopy.
