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The frog's legs twitched as the discharge happened. [6] Galvani found that he could make the prepared leg of a frog (see the Construction section) twitch by connecting a metal circuit from a nerve to a muscle, thus inventing the first frog galvanoscope. [7] Galvani published these results in 1791 in De viribus electricitatis. [8]
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The African clawed frog or platanna, Xenopus laevis, was first widely used in laboratories in pregnancy assays in the first half of the 20th century. When human chorionic gonadotropin , a hormone found in substantial quantities in the urine of pregnant women, is injected into a female X. laevis , it induces them to lay eggs .
Frogs are used for dissections in high school and university anatomy classes, often first being injected with coloured substances to enhance contrasts among the biological systems. This practice is declining due to animal welfare concerns, and "digital frogs" are now available for virtual dissection. [222]
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Most of these frogs are caught in the wild, but some are raised in captivity. The United States is a net importer of frog legs. [68] The American bullfrog is used as a specimen for dissection in many biology and anatomy classes in schools across the world. [69] It is the state amphibian of Missouri, Ohio, and Oklahoma. [70]
Frequency-resolved optical gating (FROG) is a general method for measuring the spectral phase of ultrashort laser pulses, which range from subfemtosecond to about a nanosecond in length. Invented in 1991 by Rick Trebino and Daniel J. Kane, FROG was the first technique to solve this problem, which is difficult because, ordinarily, to measure an ...
Breviceps fuscus is a burrowing frog, and can be found in tunnels up to 150 mm deep or among vegetation up to about 30 cm above the ground, and it generally prefers to avoid water. [3] The frog generally spends most of its time underground as it does not require open water and is primarily nocturnal . [ 9 ]