Purity

Purity is the absence of impurity or contaminants in a substance. This term also applies to the absence of vice in human character.

Purity may also refer to:

Film

Books

Companies

Pureza (Lins do Rego novel)

Pureza is a 1937 Portuguese-language novel by the Brazilian writer José Lins do Rego. The novel has been translated into English and published twice as Pureza - A Novel of Brazil translated Lucie Marion 1947, and again Pureza 1968

The novel was immediately successful in Brazil and almost immediately was made into a film, Pureza (1940). The film was produced by Adhemar Gonzaga, and directed by the Portuguese director Chianca de Garcia.

References

Colonist (The X-Files)

The Colonists are an extraterrestrial species in the science fiction television show, The X-Files, as well as the first X-Files feature film. The mystery revolving around their identity and purpose is revealed across the course of the series. In the series' plot, the Colonists are collaborating with a group of United States government officials known as the Syndicate in a plan to colonize the Earth, hence their name.

Character arc

According to the series mythology, an extraterrestrial lifeform, known in the series' mythology simply as the Colonists, were originally present on Earth in the early stages of human evolution. They highly resemble the well-known "grey aliens" in their mature form. In their immature stage, they are more yellowish colored, tall, and very aggressive, possessing fangs, claws and scale-like texture of their skin. This immature form is a protective stage, able to viciously defend itself from birth. This outer skin is eventually shed when the alien develops into its mature form. The immature form resembles that of a reptilian extraterrestrial and is referred to as the "long-clawed" form.

Pheromone

A pheromone (from Ancient Greek φέρω phero "to bear" and hormone, from Ancient Greek ὁρμή "impetus") is a secreted or excreted chemical factor that triggers a social response in members of the same species. Pheromones are chemicals capable of acting outside the body of the secreting individual to impact the behavior of the receiving individual. There are alarm pheromones, food trail pheromones, sex pheromones, and many others that affect behavior or physiology. Pheromones are used from basic unicellular prokaryotes to complex multicellular eukaryotes. Their use among insects has been particularly well documented. In addition, some vertebrates and plants communicate by using pheromones.

Background

The term "pheromone" was introduced by Peter Karlson and Martin Lüscher in 1959, based on the Greek word pherein (to transport) and hormone (to stimulate). They are also sometimes classified as ecto-hormones. They were researched earlier by various scientists, including Jean-Henri Fabre, Joseph A. Lintner, Adolf Butenandt, and ethologist Karl von Frisch who called them various names like "alarm substances." These chemical messengers are transported outside of the body and affect neurocircuits, including the autonomous nervous system with hormone or cytokine mediated physiological changes, inflammatory signaling, immune system changes and/or behavioral change in the recipient. They proposed the term to describe chemical signals from conspecifics that elicit innate behaviors soon after the German biochemist Adolf Butenandt had characterized the first such chemical, bombykol, a chemically well-characterized pheromone released by the female silkworm to attract mates.

List of honey bee pheromones

The pheromones of the Honey bee are mixtures of chemical substances released by individual bees into the hive or environment that cause changes in the physiology and behaviour of other bees.

Introduction

Honey bees (Apis mellifera) have one of the most complex pheromonal communication systems found in nature, possessing 15 known glands that produce an array of compounds. These chemical messengers secreted by a queen, drone, worker bee or laying worker bee to elicit a response in other bees. The chemical messages are received by the bee's antenna and other body parts. They are produced as a volatile or non-volatile liquid and transmitted by direct contact as a liquid or vapor.

Honey bee pheromones can be grouped into releaser pheromones which temporarily affect the recipient's behavior, and primer pheromones which have a long-term effect on the physiology of the recipient. Releaser pheromones trigger an almost immediate behavioral response from the receiving bee. Under certain conditions a pheromone can act as both a releaser and primer pheromone.