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Hace 2 días · A protein is a polyamide. Secondary structure: regularly repeating local structures stabilized by hydrogen bonds. The most common examples are the α-helix, β-sheet and turns. Because secondary structures are local, many regions of different secondary structure can be present in the same protein molecule.
Hace 2 días · v. t. e. An empire is a political unit made up of several territories, military outposts, and peoples, "usually created by conquest, and divided between a dominant center and subordinate peripheries". [1] The center of the empire (sometimes referred to as the metropole) exercises political control over the peripheries. [2]
Hace 2 días · Venus of Hohle Fels, Germany, oldest known sculpture of a human being, 42.000–40.000 BP Dying Gaul, or The Capitoline Gaul, a Roman marble copy of a Hellenistic work of the late 3rd century BCE, Capitoline Museums, Rome Assyrian lamassu gate guardian from Khorsabad, c. 800 –721 BCE Michelangelo's Moses, (c. 1513–1515), San Pietro in Vincoli, Rome, for the tomb of Pope Julius II Netsuke ...
Hace 3 días · Asia is the largest continent on Earth. It covers 9% of the Earth's total surface area (or 30% of its land area), and has the longest coastline, at 62,800 kilometres (39,022 mi). Asia is generally defined as comprising the eastern four-fifths of Eurasia.
Hace 5 días · El kanato de Crimea fue incorporado al Imperio ruso. 24 de abril de 1783: Tr: El reino de Kartli-Kajetia, amenazado por los imperios persa y otomano, firmó el Tratado de Georgievsk por el que se convirtió en protectorado ruso. 1788: G: Guerra ruso-turca (1787-1792): el Imperio otomano declaró la guerra a Rusia y encarceló a su embajador.
Hace 2 días · Turkey, officially the Republic of Türkiye, is a country mainly in Anatolia in West Asia, with a smaller part called East Thrace in Southeast Europe.It borders the Black Sea to the north; Georgia, Armenia, Azerbaijan, and Iran to the east; Iraq, Syria, and the Mediterranean Sea (and Cyprus) to the south; and the Aegean Sea, Greece, and Bulgaria to the west.
Hace 2 días · The Sasanian Empire ( / səˈsɑːniən, səˈseɪniən /) or Sassanid Empire, officially known as Eranshahr ("Kingdom of the Iranians"), [9] [10] was the last Iranian empire before the early Muslim conquests of the 7th to 8th centuries.
