Gill

A gill (ⁱ/ɡɪl/) is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment.

Many microscopic aquatic animals, and some larger but inactive ones, can absorb adequate oxygen through the entire surface of their bodies, and so can respire adequately without a gill. However, more complex or more active aquatic organisms usually require a gill or gills.

Gills usually consist of thin filaments of tissue, branches, or slender, tufted processes that have a highly folded surface to increase surface area. A high surface area is crucial to the gas exchange of aquatic organisms, as water contains only a small fraction of the dissolved oxygen that air does. A cubic meter of air contains about 250 grams of oxygen at STP. The concentration of oxygen in water is lower than air and it diffuses more slowly. In fresh water, the dissolved oxygen content is approximately 8 cm³/L compared to that of air which is 210 cm³/L. Water is 777 times more dense than air and is 100 times more viscous. Oxygen has a diffusion rate in air 10,000 times greater than in water. The use of sac-like lungs to remove oxygen from water would not be efficient enough to sustain life. Rather than using lungs, "[g]asesous exchange takes place across the surface of highly vascularised gills over which a one-way current of water is kept flowing by a specialised pumping mechanism. The density of the water prevents the gills from collapsing and lying on top of each other, which is what happens when a fish is taken out of water."

Gill (name)

Gill may be a surname or given name, derived from a number of unrelated sources;

People with the surname Gill

List of Kim Possible characters

This is a list of characters appearing in the animated series Kim Possible.

Team Possible

Kim Possible

Kimberly Ann "Kim" Possible is a crime fighter and high school cheerleading captain who saves the world on a regular basis while dealing with the normal challenges of a teenager, such as winning cheer competitions, turning in her homework on time, and maintaining a love life. Her name is a play on the word "impossible." Kim has known Ron Stoppable, her sidekick for most missions, since preschool. She has also completed missions with Wade, Monique, her brothers, and even her mother. Kim and Ron end up developing romantic feelings for each other and begin dating during their senior year, in Season 4. She famously adopts untypical teen slang such as "So not the drama", "No big" ("no big deal"), as well as the series' catch phrase, "What's the sitch?" (slang for "situation") in her speech. At Middleton High School, she is popular and charismatic, as well as an excellent student. She has an irritable and demanding personality that often affects her work, yet she fulfills the role of a protagonist by using her intelligence and sensibility to 'save the day'. Though she struggles with embarrassment, her rivalry with Bonnie, and her shyness around her crushes, she usually displays extreme maturity, going so far as to act as Ron's conscience at times. She has a good relationship with her family members, though she is often annoyed by her brothers (whom she calls "Tweebs", for "Twin Dweebs"), and embarrassed by her parents' antics.

Janice (given name)

Janice is a feminine given name, an extended version of Jane. Jane is one of the feminine forms of John in English. The meaning of "Janice" is "God is gracious" (from the Hebrew).

List of people with the given name Janice

List of minor Buffy the Vampire Slayer characters

Buffy the Vampire Slayer is an American franchise which spans several media and genres. It began in 1992 with the film Buffy the Vampire Slayer, written by Joss Whedon and directed by Fran Rubel Kuzui, and was resurrected as the television series, Buffy the Vampire Slayer in 1997. The show's popularity caused it to spawn a multitude of Expanded Universe tie-in material such as comic books, novels, and video games, as well as a spin-off program entitled Angel. In 2007, four years after the television series' seventh and final season, Buffy the Vampire Slayer was officially continued in the comic book Season Eight. The following is a list of minor recurring characters who appear in the franchise.

A

Aluwyn

(a.k.a. Saga Vasuki)

Amanda

Amanda is a Potential Slayer who appears in Season Seven, played by Sarah Hagan. A Sunnydale High student and member of the swing choir, she first appears in the episode "Help" as part of the seemingly-random stream of students showing up at Buffy's guidance office. Amanda was sent to Buffy for beating up another student who was picking on her. In the later episode "Potential", it is revealed that Amanda is in fact a Potential Slayer, and she aptly slays a vampire who threatens her and Dawn. Afterwards, Amanda moves into the Summers' residence, where she trains and becomes friends with her fellow Potentials. In the final episode of the show, "Chosen", Amanda is activated as a Slayer along with the other Potentials and battles against an army of Turok-Han vampires. She is last seen falling to the ground dead after her neck was snapped by a Turok-Han. She was the first Potential to kill a vampire and the first one to kill a Turok-Han.

Beetle (comics)

The Beetle is the name used by multiple fictional characters appearing in American comic books published by Marvel Comics. It is also the name of the three versions of high tech armor used by seven separate characters.

Publication history

The Beetle debuted in the "Human Torch" segment of Strange Tales #123 (August 1964) with the original incarnation Abner Jenkins using the first armor. This version was beaten by the Thing and Human Torch. This version would only be used for a few years before the character switched to the second armor (which is most associated with the name) and would be in use until Thunderbolts #1 (April 1997) when Jenkins's alter ego was changed to MACH-1. A new version debuted in Thunderbolts #35 (February 2000). This version resembled a walking tank and would be used by Jenkins and the second incarnation Leila Davis. This version was crushed by Graviton, killing Davis still inside at the time. After Davis's death, the Beetle armor would go unused until Thunderbolts #103 (August 2006) when all three versions were stolen and used by three college students. How, why and exactly when the third version of the armor was rebuilt was not made clear. The individual names of these characters were not revealed.