Isotopes utilized in nuclear medicine fall into two broad categories: Stable and Unstable. Stable isotopes do not undergo radioactive decay. WHAT IS A STABLE ISOTOPE? A stable isotope is any of two or more forms of an element whos nuclei contains the same number of protons and electrons, but a different number of neutrons. Stable isotopes remain unchanged indefinitely, but unstable (radioactive) isotopes undergo spontaneous disintegration.
Langostino is a Spanish word with different meanings in different areas. In the United States, it is commonly used in the restaurant trade to refer to the meat of the squat lobster, which is neither a true lobster nor a prawn. Squat lobsters are more closely related to porcelain and hermit crabs. Crustaceans labeled as langostino are no more than 8 cm (3 in) long, and weigh no more than 200 g (7 oz). Langostinos are not langoustes (spiny lobsters) despite a similar name (in Spanish, lobster is called langosta).
A roost is an elevated bar, branch or narrow plank on which chickens perch to sleep. Seeking high spots to spend the night has been part of chicken survival instincts since long before its domestication over 5000 years ago. Chickens arenât all that fast, they lack the prowess to ward off many predators and they are sound sleepers.