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Hace 3 días · Universal Time (UT1) is mean solar time at 0° longitude, computed from astronomical observations. It varies from TAI because of the irregularities in Earth's rotation. Coordinated Universal Time (UTC) is an atomic time scale designed to approximate Universal Time. UTC differs from TAI by an integral number of seconds.
Hace 4 días · Visna-maedi virus. The human immunodeficiency viruses ( HIV) are two species of Lentivirus (a subgroup of retrovirus) that infect humans. Over time, they cause acquired immunodeficiency syndrome (AIDS), [1] [2] a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. [3]
Hace 4 días · Qantas Empire Airways Short Empire flying boats at Rose Bay in Sydney Harbour, 1939. Qantas was founded in Winton, Queensland on 16 November 1920 by Hudson Fysh, Paul McGinness and Fergus McMaster as Queensland and Northern Territory Aerial Services Limited. [21] [22] The airline's first aircraft was an Avro 504K.
Hace 1 día · Social media can help to improve an individual's sense of connectedness with others and be an effective communication (or marketing) tool for corporations, entrepreneurs, non-profit organizations, advocacy groups, political parties, and governments. Social movements use social media for communicating and organizing.
Hace 4 días · e. A red tulip exhibiting a partially yellow petal due to a mutation in its genes. Mutation with double bloom in the Langheck Nature Reserve near Nittel, Germany. In biology, a mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. [1]
Hace 1 día · Dementia. Dementia is a syndrome associated with many neurodegenerative diseases, characterized by a general decline in cognitive abilities that impacts a person's ability to perform everyday activities. This typically involves problems with memory, thinking, behavior, and motor control. [10]
Hace 3 días · 2023–24 NFL playoffs. The National Football League playoffs for the 2023 season began on January 13, 2024, and concluded with Super Bowl LVIII on February 11 at Allegiant Stadium in Paradise, Nevada with the Kansas City Chiefs defeating the San Francisco 49ers. This was the first postseason since 1998 not to feature either Peyton Manning or ...
