Causes and Effects of Stratospheric Ozone Reduction An Update (1982) / Chapter Skim
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GLOSSARY
GLOSSARY
Pages 134-141
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From page 134... ...
This cancer arises in the basal cell layer of the epidermis where cells continually divide and replace dead cells in the epidermis. Carcinogenesis: The production and development of cancer.
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From page 135... ...
. Catalytic cycle: A set of chemical reactions wherein one or more reactive species are alternately consumed and generated.
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Excision repair: A cellular repair mechanism that eliminates photoproducts in DNA, thereby ameliorating UV damage to DNA. In this process, products of UV irradiation are removed from one strand of a DNA
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Lymphocytes: Circulating white blood cells that are part of the immune system. Mast cell: A connective tissue cell whose physiologic function remains partly unknown; after a variety of insults or stimuli the cell releases chemicals that are mediators of inflammation.
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Melanoma: A tumor made up of melanin-pigmented cells. Melanoma is a serious, sometimes fatal form of skin cancer, usually developing from a nevus and consisting of black masses of cells with a tendency to metastasize.
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From page 139... ...
Photoprotection involves the induction by W-A of a delay in growth, allowing for more time after UV-B irradiation is completed for error-free dark-repair systems to repair the damaged DNA. Photoreactivation: A cellular repair mechanism that eliminates photoproducts in DNA, thereby ameliorating UV damage to DNA.
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From page 140... ...
In this report the term refers to reactive species such as OH, HO2, C1, and C1O, each of which contains a single unpaired electron. The ease of combining with other molecules to form bonds having paired electron spins is understood as the seat of their reactivity.
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From page 141... ...
: An inheritable change wherein cells in culture are altered such that they do not stop growing when they encounter similar cells. Colonies of UV-transformed rodent cells are often tumorigenic when injected into certain animals, but no tumorigenicity has been shown for the W-transformed human cells described in the experimental results shown in Figure 3.1.
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Key Terms
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