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THE CARCINOGENIC HYDROCARBONs
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absorbed absorption acne active anthracene appear Arch areas biologic Brit cancer carbon CARCINOGENESIS carcinogenic carcinoma cause cell changes chemical chronic coal coal tar coke color common compounds containing cosmic rays crude cutaneous Dermat dermatoses described develop distillation dust effects energy epidermal epithelial epithelioma especially exposed exposure face factors fluorescence folliculitis forearms fraction hands Heavy hydrocarbons incidence individual industry irritation keratoses latter layer lesions less light malignancy material measure Melanosis months naphthalene nature neck observed obtained Occupational occurring organic papillomas period petroleum petroleum oils photodynamic action photons Photosensitization pigmentation pitch plant precancerous present properties protection quantum radiation range rays reaction Report residue result scrotum sensitization skin solar radiation Solubility specific spectral spectrum substance sunlight surface Syph tars temperature tion tissues ultraviolet usually varies wart wave length Wood workers X-rays zone