Isis (disambiguation)

Isis is a goddess from the polytheistic pantheon of Egypt.

Isis or ISIS may also refer to:

Organisations

Non-profits

Isis (band)

Isis (stylized as ISIS) was a Los Angeles-based post-metal band, founded in Boston, Massachusetts, with a career spanning from 1997 to 2010. They borrowed from and helped to evolve a sound pioneered by the likes of Neurosis and Godflesh, creating heavy music consisting of lengthy songs that focus on repetition and evolution of structure.

The band's last album, Wavering Radiant, was released on 5 May 2009. They disbanded in June 2010, just before the release of a split EP with the Melvins.

History

Formation and early releases (1997–2001)

Isis (song)

"Isis" is a ballad written by Bob Dylan in collaboration with Jacques Levy, in July 1975. The song is the second track on the Bob Dylan album Desire.

Description

This song is in a moderately fast 3/4 time, in the key of B-flat major. The arrangement is based on rhythm chords played on acoustic piano, accompanied by bass guitar, drums, and violin. The harmonic progression consists of an ostinato using the following chords throughout:

Ⅰ–ⅤⅠⅠ♭–Ⅳ–Ⅰ
B♭–A♭–E♭–B♭

The lyrics are all verses; there is no chorus. The melody is in the style of a modal folk song, emphasizing the tonic and dominant notes in the scale, with leaps of a fifth in between them. The mode is Mixolydian with a major third in the harmony, but Dylan's delivery of the melody and Rivera's violin accompaniment use a flatted third as in the blues.

Song Narrative

Catalysis

Catalysis (/kəˈtælᵻsᵻs/) is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst (/ˈkætəlᵻst/). With a catalyst, reactions occur faster and require less activation energy. Because catalysts are not consumed in the catalyzed reaction, they can continue to catalyze the reaction of further quantities of reactant. Often only tiny amounts are required.

Technical perspective

In the presence of a catalyst, less free energy is required to reach the transition state, but the total free energy from reactants to products does not change. A catalyst may participate in multiple chemical transformations. The effect of a catalyst may vary due to the presence of other substances known as inhibitors or poisons (which reduce the catalytic activity) or promoters (which increase the activity). The opposite of a catalyst, a substance that reduces the rate of a reaction, is an inhibitor.

Catalyzed reactions have a lower activation energy (rate-limiting free energy of activation) than the corresponding uncatalyzed reaction, resulting in a higher reaction rate at the same temperature and for the same reactant concentrations. However, the detailed mechanics of catalysis is complex. Catalysts may affect the reaction environment favorably, or bind to the reagents to polarize bonds, e.g. acid catalysts for reactions of carbonyl compounds, or form specific intermediates that are not produced naturally, such as osmate esters in osmium tetroxide-catalyzed dihydroxylation of alkenes, or cause dissociation of reagents to reactive forms, such as chemisorbed hydrogen in catalytic hydrogenation.

Catalyst (think tank)

Catalyst (later Catalyst Forum) was an independent left wing think tank based in London, United Kingdom, set up in 1998 to promote policies directed to the redistribution of power, wealth and opportunity. Though not aligned to any political party, it was generally sympathetic to the Labour Movement and described itself as "an organisation of the left".

The organisation was founded at the high point of Tony Blair's modernisation of the Labour Party and struggled to attract funding, especially from the trades unions who had originally been expected to be the most sympathetic to its redistributionist platform. Trades unions, concerned at further exclusion from power either by the electorate or the new Labour Party leadership, took a sharp turn away from too deep an association with the Left at this time and only begun in 2005 and 2006 to develop an increased if cautious interest in left-wing thought as a new generation of activist trades union leaders has emerged.

Former right wing but egalitarian Deputy Leader of the Labour Party, Roy Hattersley, was an early supporter, as was John Edmonds, General Secretary of the GMB Union.

Cisco Catalyst

Catalyst is the brand name for a variety of network switches sold by Cisco Systems. While commonly associated with Ethernet switches, a number of different interfaces have been available throughout the history of the brand. Cisco acquired several different companies and rebranded their products as different versions of the Catalyst product line. The original Catalyst 5000 and 6000 series were based on technology acquired from Crescendo Communications. The 1700, 1900, and 2800 series Catalysts came from Grand Junction Networks, and the Catalyst 3000 series came from Kalpana in 1994.

In addition, Cisco increasingly offers routers with switching capabilities; for example the Cisco 7600 series routers and the Catalyst 6500 series L3–switches have interchangeable parts. Even Cisco′s smaller routers, including their newest “ISR” series, can have switch modules installed in them, basically making Cisco′s smaller switches fully integrated devices.

Operating systems

In most cases, the technology for the Catalyst Switch was developed separately from Cisco′s router technology. The Catalyst switches originally ran software called CatOS rather than the more widely known Cisco IOS software used by routers. However, this has changed as the product lines have merged closer together. In some cases, particularly in the modular chassis switches, a configuration called 'Hybrid' has emerged - this is where the layer 2 functions are configured using CatOS, and the layer 3 elements are configured using IOS. 'Native IOS' can also be found with newer software versions that have eliminated CatOS entirely in favor of IOS, even on hardware that originally required CatOS.