March 15, 2018

Acceptability of Risk From Radiation - Human Spaceflight - download pdf or read online

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This lack of clear causal connections explains the problems faced in primary prevention of developmental disorders. 3 presents the estimates from different sources (Nelson 1989, Kalter 1983, Wilson 1977). 3. 3 ? 6 registry (1987–2000) with 143,335 births in the registration area. The registration was limited to live births up to the completion of the first week. Medicinal products and other chemical substances are estimated to account for only some percentage of developmental disorders, but they may play a more important role in the causation of defects through interaction with other (genetic) factors and maternal metabolic diseases.

Certainly, fertility disturbances are to be expected and have been reported with, for example, radiotherapy, cyclophosphamide, dibromochlorpropane, and lead (Friedman 2003, Sallmén 2003). Environmental agents with anti-androgenic or estrogenic activities, such as PCBs, dioxins and phthalates, are also incriminated in this respect (see review by Storgaard 2006). Casuistic cases have been mentioned with mesalazine in colitis ulcerosa (Chermesh 2004, Fisher 2004). 23) have also been associated with an increased risk of spontaneous abortions, developmental abnormalities and even childhood cancers (Aitken 2003).

3 Reproductive stages The different stages of reproduction are, in fact, highlights of a continuum. These stages concern a different developmental time-span, each with its own sensitivity to a given toxic agent. 1. g. g. 4 Reproductive and developmental toxicology Primordial germ cells are present in the embryo at about 1 month after the first day of the last menstruation. They originate from the yolksac-entoderm outside the embryo, and migrate into the undifferentiated primordia of gonads located at the medio-ventral surface of the urogenital ridges.

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