Rainbow

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

Rainbows can be full circles; however, the average observer sees only an arc formed by illuminated droplets above the ground, and centred on a line from the sun to the observer's eye.

In a primary rainbow, the arc shows red on the outer part and violet on the inner side. This rainbow is caused by light being refracted when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.

In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, with red on the inner side of the arc.

Overview

A rainbow is not located at a specific distance from the observer, but comes from an optical illusion caused by any water droplets viewed from a certain angle relative to a light source. Thus, a rainbow is not an object and cannot be physically approached. Indeed, it is impossible for an observer to see a rainbow from water droplets at any angle other than the customary one of 42 degrees from the direction opposite the light source. Even if an observer sees another observer who seems "under" or "at the end of" a rainbow, the second observer will see a different rainbow—farther off—at the same angle as seen by the first observer.

Rainbow (2005 film)

Rainbow (simplified Chinese: 我心飞翔; traditional Chinese: 我心飛翔; pinyin: Wǒ Xīn Fēi Xiáng; literally: "my heart is flying") is a 2005 Chinese film written and directed by Gao Xiaosong, starring Chen Daoming.

Cast

External links

Who You Are (Jessie J album)

Who You Are is the debut studio album by English singer-songwriter Jessie J, released on 28 February 2011. Due to high demand and interest from fans, the release advanced by a month from 28 March, as previously planned. Production for the album took place throughout 2010 and contributing producers included: Dr. Luke, Toby Gad and K-Gee.

Who You Are received generally mixed reviews from contemporary music critics. It débuted at number two on the UK Albums Chart selling 105,000 copies in its first week. The album débuted in the US at number 11 on the Billboard 200 with first-week sales of 34,000 copies. Two singles preceded the album: Jessie J's UK début single "Do It Like a Dude" and "Price Tag", featuring B.o.B which served as the US lead single. A third single, "Nobody's Perfect", became J's third consecutive top 10 hit in the UK. The fourth single from the album "Who's Laughing Now", released 21 August 2011, peaked at #16 on the UK Singles Chart. The title track, "Who You Are", was released on 13 November 2011 as the album's fifth UK single.

Hat

A hat is a head covering which is worn for various reasons, including protection against the elements, ceremonial reasons, religious reasons, safety, or as a fashion accessory. In the past, hats were an indicator of social status. In the military, hats may denote nationality, branch of service, rank and/or regiment.Police typically wear distinctive hats such as peaked caps or brimmed hats, such as those worn by the Royal Canadian Mounted Police. Some hats have a protective function. As examples, the hard hat protects construction workers' heads from injury by falling objects and a British police Custodian helmet protects the officer's head, a sun hat shades the face and shoulders from the sun, a cowboy hat protects against sun and rain and a Ushanka fur hat with fold-down ear-flaps keeps the head and ears warm. Some hats are worn for ceremonial purposes, such as the mortarboard, which is worn (or carried) during university graduation ceremonies. Some hats are worn by members of a certain profession, such as the Toque worn by chefs. Some hats have a religious functions, such as the Mitres worn by Bishops and the turban worn by Sikhs.

Hats (party)

The Hats (Swedish: Hattarna) were a Swedish political faction active during the Age of Liberty (1719–1772). Their name derives from the tricorne hat worn by officers and gentlemen. They vied for power with the opposing Caps party. The Hats, who ruled Sweden from 1738 to 1765, advocated an alliance with France and an assertive foreign policy, especially towards Russia. During their tenure, they involved Sweden in two expensive and disastrous wars, in the 1740s and 1750s.

Policy

Histone acetyltransferase

Histone acetyltransferases (HATs) are enzymes that acetylate conserved lysine amino acids on histone proteins by transferring an acetyl group from acetyl CoA to form ε-N-acetyllysine. DNA is wrapped around histones, and, by transferring an acetyl group to the histones, genes can be turned on and off. In general, histone acetylation increases gene expression.

In general, histone acetylation is linked to transcriptional activation and associated with euchromatin. When it was first discovered, it was thought that acetylation of lysine neutralizes the positive charge normally present, thus reducing affinity between histone and (negatively charged) DNA, which renders DNA more accessible to transcription factors. Research has emerged, since, to show that lysine acetylation and other posttranslational modifications of histones generate binding sites for specific protein–protein interaction domains, such as the acetyllysine-binding bromodomain. Histone acetyltransferases can also acetylate non-histone proteins, such as nuclear receptors and other transcription factors to facilitate gene expression.