PBX

PBX may refer to:

PBX2

Pre-B-cell leukemia transcription factor 2 is a protein that in humans is encoded by the PBX2 gene.

This gene encodes a ubiquitously expressed member of the TALE/PBX homeobox family. It was identified by its similarity to a homeobox gene which is involved in t(1;19) translocation in acute pre-B-cell leukemias. This protein is a transcriptional activator which binds to the TLX1 promoter. The gene is located within the major histocompatibility complex (MHC) on chromosome 6.

Interactions

PBX2 has been shown to interact with HOXA9.

References

Further reading

External links

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Polymer-bonded explosive

A polymer-bonded explosive, also called PBX or plastic-bonded explosive, is an explosive material in which explosive powder is bound together in a matrix using small quantities (typically 5–10% by weight) of a synthetic polymer ("plastic"). Note that despite the word "plastic", polymer-bonded explosives are not hand malleable after curing, and hence are not a form of plastic explosive. PBXs are normally used for explosive materials that are not easily melted into a casting, or are otherwise difficult to form. PBX was first developed in 1952 in Los Alamos National Laboratory, as RDX embedded in polystyrene with dioctyl phthalate plasticizer. HMX compositions with teflon-based binders were developed in 1960s and 1970s for gun shells and for Apollo Lunar Surface Experiments Package (ALSEP) seismic experiments, although the latter experiments are usually cited as using Hexanitrostilbene (HNS).

Potential advantages

Polymer-bonded explosives have several potential advantages:

Address

Address or The Address may refer to:

Address (geography)

An address is a collection of information, presented in a mostly fixed format, used for describing the location of a building, apartment, or other structure or a plot of land, generally using political boundaries and street names as references, along with other identifiers such as house or apartment numbers. Some addresses also contain special codes to aid routing of mail and packages, such as a post code.

Functions

Addresses have several functions:

History

Until the advent of modern postal systems, most houses and buildings were not numbered. Streets may have been named for landmarks, such as a city gate or market, or for the professions of their inhabitants. In many cities in Asia, most minor streets were never named. This is still the case today in much of Japan. When postal systems were introduced, it became necessary to number buildings to aid in mail delivery.

T–V distinction

In sociolinguistics, a T–V distinction (from the Latin pronouns tu and vos) is a contrast, within one language, between various forms of addressing one's conversation partner or partners that are specialized for varying levels of politeness, social distance, courtesy, familiarity, age or insult toward the addressee. Languages such as modern English that, outside of certain dialects, have no morphosyntactic T–V distinction may have semantic analogues to convey the mentioned attitudes towards the addressee, such as whether to address someone by given or surname, or whether to use "sir" or "ma'am". Under a broader classification, T and V forms are examples of honorifics.

History and usage

The terms T and V, based on the Latin pronouns tu and vos, were first used in a paper by the social psychologist Roger Brown and the Shakespearian scholar Albert Gilman. This was a historical and contemporary survey of the uses of pronouns of address, seen as semantic markers of social relationships between individuals. The study considered mainly French, Italian, Spanish and German. The paper was highly influential and with few exceptions, the terms T and V have been used in subsequent studies.