Addition

Addition (often signified by the plus symbol "+") is one of the four basic operations of arithmetic, with the others being subtraction, multiplication and division. The addition of two whole numbers is the total amount of those quantities combined. For example, in the picture on the right, there is a combination of three apples and two apples together; making a total of 5 apples. This observation is equivalent to the mathematical expression "3 + 2 = 5" i.e., "3 add 2 is equal to 5".

Besides counting fruits, addition can also represent combining other physical objects. Using systematic generalizations, addition can also be defined on more abstract quantities, such as integers, rational numbers, real numbers and complex numbers and other abstract objects such as vectors and matrices.

In arithmetic, rules for addition involving fractions and negative numbers have been devised amongst others. In algebra, addition is studied more abstractly.

Addition has several important properties. It is commutative, meaning that order does not matter, and it is associative, meaning that when one adds more than two numbers, the order in which addition is performed does not matter (see Summation). Repeated addition of 1 is the same as counting; addition of 0 does not change a number. Addition also obeys predictable rules concerning related operations such as subtraction and multiplication.

ADD1

Alpha-adducin is a protein that in humans is encoded by the ADD1 gene.

Adducins are a family of cytoskeleton proteins encoded by three genes (alpha, beta, gamma). Adducin is a heterodimeric protein that consists of related subunits, which are produced from distinct genes but share a similar structure. Alpha- and beta-adducin include a protease-resistant N-terminal region and a protease-sensitive, hydrophilic C-terminal region. Alpha- and gamma-adducins are ubiquitously expressed. In contrast, beta-adducin is expressed at high levels in brain and hematopoietic tissues. Adducin binds with high affinity to Ca(2+)/calmodulin and is a substrate for protein kinases A and C. Alternative splicing results in multiple variants encoding distinct isoforms; however, not all variants have been fully described. Polymorphism in ADD1 is associated with hypertension.

References

Further reading

ADD3

Gamma-adducin is a protein that in humans is encoded by the ADD3 gene.

Adducins are heteromeric proteins composed of different subunits referred to as adducin alpha, beta and gamma. The three subunits are encoded by distinct genes and belong to a family of membrane skeletal proteins involved in the assembly of spectrin-actin network in erythrocytes and at sites of cell-cell contact in epithelial tissues. While adducins alpha and gamma are ubiquitously expressed, the expression of adducin beta is restricted to brain and hematopoietic tissues. Adducin, originally purified from human erythrocytes, was found to be a heterodimer of adducins alpha and beta. Polymorphisms resulting in amino acid substitutions in these two subunits have been associated with the regulation of blood pressure in an animal model of hypertension. Heterodimers consisting of alpha and gamma subunits have also been described. Structurally, each subunit is composed of two distinct domains. The amino-terminal region is protease-resistant and globular in shape, while the carboxy-terminal region is protease-sensitive. The latter contains multiple phosphorylation sites for protein kinase C, the binding site for calmodulin, and is required for association with spectrin and actin. Alternatively spliced adducin gamma transcripts encoding different isoforms have been described. The functions of the different isoforms are not known.

Red (T'Pau album)

Red is the fourth studio album by British pop/rock group T'Pau. It was released in 1998, and was the first album since The Promise from 1991.

The group originally gained success in the late 1980s and split in the early 1990s. In 1997 original lead singer Carol Decker reformed the band with a completely new line-up and released a brand new version of their original hit "Heart and Soul". The new line-up started playing gigs and recorded this album in 1998. The album was released on Decker's own Gnatfish label, and would be released in America during late 1999 with a bonus CD featuring three extra tracks (including the 1997 version of "Heart and Soul"). In 2007, the album was officially released for download. It would be Decker's last album/single release until the 2007 solo single "Just Dream".

Background

After the original split of T'Pau, Decker attempted a solo career. In 1993, she contributed a track to the soundtrack of the film Dirty Weekend, and the following year a small number of live performances followed. In 1995 she released the single "One Heart" - as the official anthem for the Halifax World Cup Rugby League Centenary '95. It peaked at #130 in the UK. She performed the song at Wembley Stadium during the opening and closing ceremonies. By 1997 though, Decker had taken the decision to build a 'new' T'Pau around her, and get back on the road after assembling a massive amount of new material. Although she considered continuing as a solo artist, it was advised that it would be easier if the band name was rekindled. The newly reformed band featured none of the original members aside from Decker. A brand new version of the band's original hit "Heart and Soul" was released as "Heart and Soul '97" (featuring the future Red album track "Make Love to Me"), and the band went onto Cilla Black's Surprise Surprise TV show to perform the song. However it was not a commercial success.

Red (audio drama)

Red is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who.

Plot

The citizens of the Needle are all chipped to prevent them from committing violence. When the Seventh Doctor and Mel arrive, they arouse interest as the only people able to cause harm…

Cast

External links

Reviews

Red (cipher machine)

In the history of cryptography, 91-shiki ohbun-injiki (九一式欧文印字機) ("System 91 Printing Machine") or Angōki Taipu-A (暗号機 タイプA) ("Type A Cipher Machine"), codenamed Red by the United States, was a diplomatic cryptographic machine used by the Japanese Foreign Office before and during World War II. A relatively simple device, it was quickly broken by western cryptographers. The Red cipher was succeeded by the "Purple" machine ("97-shiki ōbun inji-ki") which used some of the same principles. Parallel usage of the two systems assisted in the breaking of the Purple system.

The Red cypher should not be confused with the Red naval code, which was used by the Imperial Japanese Navy between the wars. The latter was a codebook system, not a cipher.

Operation

The Red machine encrypted and decrypted texts written in Latin characters (alphabetic only) for transmission through the cable services. These services charged a lower rate for texts that could be pronounced than for random strings of characters; therefore the machine produced telegraph code by enciphering the vowels separately from the consonants, so that the text remained a series of syllables. (The letter "Y" was treated as a vowel.) The "sixes and twenties" effect (as American analysts referred to it) was a major weakness which the Japanese continued in the Purple system.