sparrow: cytogenetic effects of ionizing radiations 



101 



Table 7. — Continued. 



Chemical 



References 



Chemical 



References 



K. Oxidizing substances 



1 . Ferric sulfate 



2. Hydrogen peroxide 



3. Nitric oxide 



4. Oxygen 



L. Neutron absorbers 



1 . Boron 



2. Cadmium 



M. Nutrients 



1 . Boron 



2. Calcium 



3. Cobalt 



4. Magnesium 



5. Nitrogen 

 N. P H 



157(page 1520) 5. Sodium 



91,125,180 peroxydisulfate 



2,122 6. Sodium pyrosulfate 

 57 (page 378), 

 91,125,143,202 



86 (page 38) 3. Lithium 

 86 (page 38) 



73 



149 6. Phosphorus 



175,176,177 7. Potassium 



60 8. Sulphur 



60 9. Zinc 



157 (page 1521) 

 160 



128 

 128 



86 (page 38) 



157 (page 1521) 



9 



157 (page 1521) 



60 



O. Reducing substances (without -SH groups) 



1 . Ascorbic acid 



2. Hydrogen 



3. Hydrogen sulfide 



P. Sulfhydryl compounds 

 1. Cysteamine 



27,86(page 38) 4. Sodium hydrosulfite 

 57 (page 379) 5. Sodium hyposulfite 



117 



73, 4. Glutathione 



202 (page 362) 



2. Cysteine 137 (page 24), 5. Thiourea 



202 (page 362) 



3. 2,3-dimercaptopropanol 57 (page 388), 

 (BAD 125 



57 (page 388) 

 57 (page 388) 



57 (page 388), 



202 (page 357) 



57 (page 388) 



us or chromosome is very important in determining the frequency 

 of chromosome breakage per roentgen of exposure (116, 161, 163, 

 165). Data collected from several species of plants with different 

 nuclear volumes indicate that, under comparable conditions of 

 chronic irradiation, somatic nuclei yield a more or less standard 

 number of chromosome breaks per cubic micron of nuclear volume 

 per roentgen of exposure (155). It is thus apparent that any nuclear 

 volume difference between species, between stages in development, 

 or between tissues in either plants or animals should have a great 



