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Il y a 1 jour · Chemistry. Nicotine is a hygroscopic, colorless to yellow-brown, oily liquid, that is readily soluble in alcohol, ether or light petroleum. It is miscible with water in its neutral amine base form between 60 °C and 210 °C. It is a dibasic nitrogenous base, having K b1 =1×10 −6, K b2 =1×10 −11. [161]
Il y a 1 jour · Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g. distances and ...
Il y a 1 jour · Tiger. The tiger ( Panthera tigris) is a member of the genus Panthera and the largest living cat species native to Asia. It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes. It is traditionally classified into nine recent subspecies, though some recognise only two ...
Il y a 1 jour · Cyndi won Best New Artist at the 1985 Grammy Awards. She's So Unusual also received nominations for Album of the Year, Record of the Year, Best Female Pop Vocal Performance (for "Girls Just Want to Have Fun"), and Song of the Year (for "Time After Time"). She wore almost a pound of necklaces at her award ceremony.
Il y a 1 jour · Holography. Holography is a technique that enables a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interferometry. In principle, it is possible to make a hologram for any type of wave .
Il y a 3 heures · The Southern United States, sometimes Dixie, also referred to as the Southern States, the American South, the Southland, Dixieland, or simply the South, is a geographic and cultural region of the United States. It is between the Atlantic Ocean and the Western United States, with the Midwestern and Northeastern United States to its north and the ...
Il y a 1 jour · Color-coded elevation map, showing the elevated terrae "continents" in yellow and minor features of Venus. The Venusian surface was a subject of speculation until some of its secrets were revealed by planetary science in the 20th century. Venera landers in 1975 and 1982 returned images of a surface covered in sediment and relatively angular rocks.
