Thirteenth Step

Thirteenth Step is the second studio album by American rock band A Perfect Circle, released on September 16, 2003. The album sold well, charting at the number 2 position on the Billboard 200 in its premiere week, selling over 231,000 copies and staying on the charts for 78 weeks. The album went on to be certified as gold on November 4, 2003 and as platinum on March 24, 2006 by the RIAA. Three singles were released from the album, "Weak and Powerless", which topped both the Mainstream Rock Tracks and Modern Rock Tracks, followed by "The Outsider" and "Blue", which also charted on the respective charts.

Background

Writing and recording

The band's writing process was very different from the band's first album, Mer de Noms. With the first album, a majority of the album had been already written and recorded over a long period of time by guitarist Billy Howerdel, before a band had even been assembled. He had recorded it with a female vocalist in mind, but upon Tool vocalist Maynard James Keenan hearing it and offering to sing for the material, the content was then quickly finalized upon adding Keenan's vocals and re-recording the drums with band member Josh Freese. With beginning the second album, the band found themselves starting fresh, without any material to start with, with the exception of the track "Vanishing", which originally was intended to be on the band's first album, but Howerdel could not find the song file in the studio, having accidentally named it "test". Upon finally recovering the track in 2001, it was only slightly altered for its final release, to better match the eventual sound of Thirteenth Step.

7-PET

7-PET was discovered by K.W. Bentley and is a potent opioid analgesic drug, 300 times the potency of morphine by weight. It is related to the more well-known oripavine derivative opioid etorphine, which is used as a very potent veterinary painkiller and anesthetic medication, used primarily for the sedation of large animals such as elephants, giraffes and rhinos. 7-PET itself has a 3-O-methyl ether which reduces potency, but the 3-OH derivative is around 2200x morphine, almost the same potency as etorphine as a μ agonist, and unexpectedly the 3-desoxy compound is also around the same potency of 2000x morphine.

Unlike etorphine however, 7-PET is not an illegal drug, and is not controlled under the UN drug conventions, but it might still be considered to be a controlled substance analogue of etorphine on the grounds of its related chemical structure in some jurisdictions such as the USA, Canada, Australia and New Zealand.

See also

PET

PET may refer to:

Education

Medicine

Organizations

Science

Jasper Fish

Jasper Fish (buried 28 July 1791 at Sevenoaks, Kent) was a noted professional cricketer in the 18th century who was chiefly associated with Kent in the 1760s and 1770s.

Most of his career took place before cricket's statistical record began with regular scorecards in 1772 and he is recorded in only three major cricket matches in 1769, 1773 and 1777.

References

External sources

Fish anatomy

Fish anatomy is the study of the form or morphology of fishes. It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish. In practice, fish anatomy and fish physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are put together, such as might be observed on the dissecting table or under the microscope, and the latter dealing with how those components function together in the living fish.

The anatomy of fish is often shaped by the physical characteristics of water, the medium in which fish live. Water is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs more light than air does. The body of a fish is divided into a head, trunk and tail, although the divisions between the three are not always externally visible. The skeleton, which forms the support structure inside the fish, is either made of cartilage, in cartilaginous fish, or bone in bony fish. The main skeletal element is the vertebral column, composed of articulating vertebrae which are lightweight yet strong. The ribs attach to the spine and there are no limbs or limb girdles. The main external features of the fish, the fins, are composed of either bony or soft spines called rays, which with the exception of the caudal fins, have no direct connection with the spine. They are supported by the muscles which compose the main part of the trunk. The heart has two chambers and pumps the blood through the respiratory surfaces of the gills and on round the body in a single circulatory loop. The eyes are adapted for seeing underwater and have only local vision. There is an inner ear but no external or middle ear. Low frequency vibrations are detected by the lateral line system of sense organs that run along the length of the sides of fish, and these respond to nearby movements and to changes in water pressure.

Fish physiology

Fish physiology is the scientific study of how the component parts of fish function together in the living fish. It can be contrasted with fish anatomy, which is the study of the form or morphology of fishes. In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are put together, such as might be observed on the dissecting table or under the microscope, and the later dealing with how those components function together in the living fish.

Respiration

Most fish exchange gases using gills on either side of the pharynx (throat). Gills are tissues which consist of threadlike structures called filaments. These filaments have many functions and "are involved in ion and water transfer as well as oxygen, carbon dioxide, acid and ammonia exchange. Each filament contains a capillary network that provides a large surface area for exchanging oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing countercurrent exchange. The gills push the oxygen-poor water out through openings in the sides of the pharynx.