[en] The cellular uptake of sulphonated hypocrellin (S-HB), as well as photo damage on cellular viability, lipid peroxidation and intrinsic fluorescence quenching of membrane protein was studied. It was found that S-HB suitable dissolved in aqueous solution, its cellular uptake is slower than HB. The photo damage on cellular viability both photo sensitizers was close to each other, however the photo sensitizers were different in physical and chemical properties. The HB photo damage target of cells was membrane, but the sulphonated HB photo damage target of cells may be part of organelles, besides the membrane. the experiments showed the sulphonated HB would be suggested as a potential advantage for photodynamic therapy of tumor in clinical application

[en] In order to obtain the water-soluble, temperature sensitive polymer and activated copolymer, the radiation polymerization of N-isopropylacrylamide (NIPAAm), radiation copolymerization of NIPAAm and N-acryloxysuccide (NASI) in aqueous solution or in buffer solution (PBS pH = 7.4) have been carried out by γ-rays from ⁶⁰Co source at room temperature. The optimum dose range (1-7 kGy), dose rate (>40 Gy/min) and monomer concentration (1%) were chosen through determining the monomer conversion yield and molecular weight (M_w = 6.8 x 10⁵) of product. Synthesis of the reversible linear polymer was performed in tetrahydrofuran (THF) as well. In this way a white powder product could be obtained which possesses of thermally reversible property too, when it was dissolved in water or PBS. The only disadvantages of this method is that the molecular weight of the polymer produced in THF was much lower than that in aqueous solution

[en] Peripheral blood mononuclear cells from normal persons were irradiated by 1-6 Gy γ-rays in vitro. NK activity was determined by means of ³H TdR releasing and CD₅₇ positive cells were counted by means of immunocytochemistry, respectively. The results showed that NK cell activity changed not obviously within 2 Gy irradiation dose and dropped gradually with increasing irradiation dose and was distinguished lower than that of control when irradiation dose increased to 6 Gy. NK cell activity changed with time and was the lowest at 12 hours after irradiation, then it restored gradually. The restoring level of NK cell activity was related to irradiation dose. The number of NK cell had little change till 6 Gy irradiation. The activity of NK cell increased significantly when irradiated cells were stimulated with IL-2

[en] The present study was designed by ip panaxatroil (5 mg.0.2 ml·d x 14 d) 24 h before and after 5 Gy whole-body X-irradiation in male rats to observe the radioprotective effects of panaxatroil on opioid peptides and immune functions. The results showed that the hypothalamic opioid peptide contents and the immune parameters of thymus and spleen cells and decreased 14 d after irradiation, while hypothalamic opioid peptide contents approached the control level and all immune parameters decreased in irradiation plus panaxatroil group but higher than that in control group. The above results suggest that panaxatroil may alleviate the decrease of hypothalamic opioid peptide contents and immune parameters of thymus and spleen cells, and have radioprotective effects

[en] Grafting copolymerization of acrylic acid to cotton cellulose by using pre-irradiating method was investigated. At lower concentration of monomer (10%) the relationship between grafting yield and total dose, dose rate, reaction time and reaction temperature was measured. It was found that in the temperature range of 294 K to 323 K the grafting yield decreased with increasing of grafting reaction temperature. The grafting yields as a function of above reaction conditions were given by the expression Gr% = 5.9 x 10^-10De^20.27/RT(1-e^{-0.313te-6.87/RT}), where R 8.314 x 10^-3kj·K^-1·mol^-1, D = irradiation dose, T = reaction temperature, and t = reaction time

[en] Irradiation preservation is an effective method for storage of the intact cooled Huanghe carp at room temperature. The experiments have shown that for the Huanghe carp irradiated with 6-8 kGy ⁶⁰Co γ-rays, their microbiological index conformed to the National Food-Health Standard and nutritional composition and contents of amino acids were comparable to those of the carp unirradiated. No effect on growth and development of animals fed with irradiated carp was observed within 90 days animal feeding experiment. No obvious change in micronucleus and chromosome aberration were found and Ames tests were all negative. Also there was no abnormal alteration found in blood assay, internal organ observation and pathological examination

[en] The investigation result on radiation level in certain uranium mine was given. The radon concentration and α potential energy of radon progeny in mine were 6.87 x 10³ Bq·m^-3 and 1415.27 x 10^-8 J·m^-3 respectively. The γ exposure rate in mine was 6.72 C/kg·h. The concentration of radon and its progeny and γ exposure rate in mine surface, living area and its surroundings were 15.40 Bq·m^-3, 8.95 x 10^-8 J·^-3 and 0.45 C/kg·h respectively

[en] ⁶⁰Co γ-ray was used to irradiate Ashbya gossypii, which does not produce riboflavin originally, and mutants were obtained with colonial colour changing from white into yellow. Mutant ratio was high at the absorption dose of 90 Gy. Results of reverse phase-HPLC, high performance-TLC and fluoroscopic analysis proved that riboflavin is produced by the mutant fermentation. The mutant remained after generations of culture, indicating that the induced new properties are stably inheritable

[en] The results of chemical analysis and scanning electron microscopic observation show that large dose of ⁶⁰Co gamma radiation decreases substantially the chemical and biological stability of porcie dermal collagen after hydrolysis with hot alkali and collagenase. But pretreatment with 0.01-0.1% glutaraldehyde is beneficial the improvement of its stability; radiation in the wet state is better than in dry

[en] A 5-day germination test was used to identify irradiated wheat. Germination rate decreased when radiation dose was up to 3.3 kGy. nearly no seeds shot at 10 kGy. At 0.5 or 1.0 kGy irradiation did not decrease germination rate. It significantly inhibited the growth of shoots and roots. Shoot length was about 20 mm which could not be elongated by prolonged germination test. The effects of old seeds, post-irradiation storage and wheat varieties on germination were discussed