The three major naturally occurring estrogens in women are estrone (E1), estradiol (E2), and estriol (E3). Estradiol is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity.strogen may also refer to any substance, natural or synthetic that mimics the effects of the natural hormone. The steroid 17Î²-estradiol is the most potent and prevalent endogenous estrogen, but several metabolites of estradiol also have estrogenic hormonal activity.
The study of animal behavior begins with a library of behaviors, called an ethogram. An ethogram is a list of species-specific behaviors describing the elements and function of each behavior. Normally, the best ethograms are functional; they are organized into categories that reflect meaningful distinctions to the animal.
Full Definition of LITHOGRAPHY. 1. : the process of printing from a plane surface (as a smooth stone or metal plate) on which the image to be printed is ink-receptive and the blank area ink-repellent.2. : the process of producing patterns on semiconductor crystals for use as integrated circuits.See lithography defined for English-language learners.. : the process of printing from a plane surface (as a smooth stone or metal plate) on which the image to be printed is ink-receptive and the blank area ink-repellent. 2. : the process of producing patterns on semiconductor crystals for use as integrated circuits. See lithography defined for English-language learners.