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25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia pestis and spread by ...
Adrenaline is normally produced by the adrenal glands and by a small number of neurons in the medulla oblongata. [11] It plays an essential role in the fight-or-flight response by increasing blood flow to muscles, heart output by acting on the SA node, [12] pupil dilation response, and blood sugar level.
Mesopotamia [a] is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq. [1] [2] In the broader sense, the historical region of Mesopotamia also includes parts of present-day Iran, Turkey, Syria and Kuwait.
Catherine, Princess of Wales (born Catherine Elizabeth Middleton; [a] 9 January 1982), is a member of the British royal family. She is married to William, Prince of Wales, heir apparent to the British throne . Born in Reading, Catherine grew up in Bucklebury, Berkshire. She was educated at St Andrew's School and Marlborough College before ...
Wiki" (pronounced [wiki] [note 1]) is a Hawaiian word meaning "quick". [4] [5] [6] The online encyclopedia project Wikipedia is the most popular wiki-based website, as well being one of the most popular websites on the entire internet, having been ranked consistently as such since at least 2007. [7] Wikipedia is not a single wiki but rather a ...
Amino acids can be classified according to the locations of the core structural functional groups ( alpha- (α-), beta- (β-), gamma- (γ-) amino acids, etc.), other categories relate to polarity, ionization, and side chain group type ( aliphatic, acyclic, aromatic, polar, etc.). In the form of proteins, amino acid residues form the second-largest component ( water being the largest) of human ...
Klebsiella oxytoca. Klebsiella oxytoca is a Gram-negative, rod-shaped bacterium that is closely related to K. pneumoniae, from which it is distinguished by being indole-positive; it also has slightly different growth characteristics in that it is able to grow on melezitose, but not 3-hydroxybutyrate. It was first described in 1886 when it was ...
