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Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. Hypoxia may be classified as either generalized, affecting the whole body, or local, affecting a region of the body. Although hypoxia is often a pathological condition, variations in arterial oxygen concentrations can be part of the normal physiology, for example, during hypoventilation training or strenuous physical exercise.
Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Some insects, fish, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals can be divided into species that undergo complete metamorphosis ("holometaboly"), incomplete metamorphosis ("hemimetaboly"), or no metamorphosis ("ametaboly").
Physiology is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemical and physical functions in a living system. According to the classes of organisms, the field can be divided into medical physiology, animal physiology, plant physiology, cell physiology, and comparative physiology.
Ivan Petrovich Pavlov was a Russian physiologist known primarily for his work in classical conditioning.
The Nobel Prize in Physiology or Medicine is awarded yearly by the Nobel Assembly at the Karolinska Institutet for outstanding discoveries in physiology or medicine.
The neon tetra is a freshwater fish of the characin family of order Characiformes. The type species of its genus, it is native to blackwater and clearwater streams in the Amazon basin of South America. Its bright colouring makes the fish visible to conspecifics in the dark blackwater streams, and is also the main reason for its popularity among freshwater fish hobbyists.
James Braid was a Scottish surgeon, natural philosopher, and "gentleman scientist".
Erythropoietin, also known as erythropoetin, haematopoietin, or haemopoietin, is a glycoprotein cytokine secreted mainly by the kidney in response to cellular hypoxia; it stimulates red blood cell production (erythropoiesis) in the bone marrow. Low levels of EPO are constantly secreted sufficient to compensate for normal red blood cell turnover. Common causes of cellular hypoxia resulting in elevated levels of EPO include any anemia, and hypoxemia due to chronic lung disease.
An HTML element is a type of HTML document component, one of several types of HTML nodes. HTML document is composed of a tree of simple HTML nodes, such as text nodes, and HTML elements, which add semantics and formatting to parts of document. Each element can have HTML attributes specified. Elements can also have content, including other elements and text.
Histamine is an organic nitrogenous compound involved in local immune responses, as well as regulating physiological function in the gut and acting as a neurotransmitter for the brain, spinal cord, and uterus. Histamine is involved in the inflammatory response and has a central role as a mediator of itching. As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues. It consists of an imidazole ring attached to an ethylamine chain; under physiological conditions, the amino group of the side-chain is protonated.
Bradykinin is a peptide that promotes inflammation. It causes arterioles to dilate (enlarge) via the release of prostacyclin, nitric oxide, and endothelium-derived hyperpolarizing factor and makes veins constrict, via prostaglandin F2, thereby leading to leakage into capillary beds, due to the increased pressure in the capillaries. Bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.
Bugchasing is a fringe practice of pursuing sexual activity with HIV-positive individuals in order to contract HIV. The practice is documented as an extreme subculture among gay males, men who have sex with men and, to a lesser extent, among women. Individuals engaged in this activity are referred to as bugchasers, who seek sexual partners who are HIV-positive for the purpose of having unprotected sex and becoming HIV-positive; giftgivers are HIV-positive individuals who assist the bugchasers' efforts to become infected with HIV.
The Pontifical Academy of Sciences is a scientific academy of the Vatican City, established in 1936 by Pope Pius XI, and thriving with the blessing of the Papacy ever since. Its aim is to promote the progress of the mathematical, physical, and natural sciences and the study of related epistemological problems. The Academy has its origins in the Accademia Pontificia dei Nuovi Lincei, founded in 1847 as a more closely supervised successor to the Accademia dei Lincei established in Rome in 1603 by the learned Roman Prince, Federico Cesi (1585–1630), who was a young botanist and naturalist, and which claimed Galileo Galilei as its president. The Accademia dei Lincei survives as a wholly separate institution.
Red Dirt is a music genre that gets its name from the color of soil found in Oklahoma. Stillwater, Oklahoma is considered to be the center of Red Dirt music ; but the genre also extends to music made south of the Red River in Texas. Outlaw country legends Waylon Jennings and Willie Nelson have been associated with the distinctive Texas Sound, while the late Oklahoma singer-songwriter Bob Childers is widely recognized as the Father of Oklahoma Red Dirt music. At one time, the distinction between the two genres was sonically obvious, but by 2008, that gap had diminished.
Forager is a fictional superhero appearing in comic book published by DC Comics.
Herbivores are dependent on plants for food, and have coevolved mechanisms to obtain this food despite the evolution of a diverse arsenal of plant defenses against herbivory. Herbivore adaptations to plant defense have been likened to "offensive traits" and consist of those traits that allow for increased feeding and use of a host. Plants, on the other hand, protect their resources for use in growth and reproduction, by limiting the ability of herbivores to eat them. Relationships between herbivores and their host plants often results in reciprocal evolutionary change. When a herbivore eats a plant it selects for plants that can mount a defensive response, whether the response is incorporated biochemically or physically, or induced as a counterattack. In cases where this relationship demonstrates "specificity", and "reciprocity", the species are thought to have coevolved. The escape and radiation mechanisms for coevolution, presents the idea that adaptations in herbivores and their host plants, has been the driving force behind speciation. The coevolution that occurs between plants and herbivores that ultimately results in the speciation of both can be further explained by the Red Queen hypothesis. This hypothesis states that competitive success and failure evolve back and forth through organizational learning. The act of an organism facing competition with another organism ultimately leads to an increase in the organism's performance due to selection. This increase in competitive success then forces the competing organism to increase its performance through selection as well, thus creating an "arms race" between the two species. Herbivores evolve due to plant defenses because plants must increase their competitive performance first due to herbivore competitive success.
The respiratory exchange ratio (RER) is the ratio between the amount of carbon dioxide (CO2) produced in metabolism and oxygen (O2) used.
Acid–base homeostasis is the homeostatic regulation of the pH of the body's extracellular fluid (ECF). The proper balance between the acids and bases in the ECF is crucial for the normal physiology of the body, and cellular metabolism. The pH of the intracellular fluid and the extracellular fluid need to be maintained at a constant level.
"War of the Coprophages" is the twelfth episode of the third season of the science fiction television series The X-Files. It premiered on the Fox network on January 5, 1996. It was written by Darin Morgan, and directed by Kim Manners. The episode is a "Monster-of-the-Week" story, a stand-alone plot which is unconnected to the series' wider mythology. "War of the Coprophages" earned a Nielsen household rating of 10.1, being watched by 16.32 million people in its initial broadcast. The episode received mostly positive reviews from critics, who praised its humorous tone.
The Ochteridae comprise a small family of insects. Eight genera with about 80 species have been described. They occur worldwide along the shore of various types of water and the greatest diversity is in tropical regions. They are "true bugs", being members of the order Hemiptera, and are in the suborder Heteroptera. Ochteridae commonly are known as the velvety shore bugs. They resemble the Saldidae shore bugs and have lengths ranging from 4.5 to 9 mm (0.18–0.35 in).
References
- ↑ U. Yinon, P. Amitaia & A. Shulov (1972). "The stridulatory mechanism and the analysis of sound produced by the bug Holotrichius innesi (Horvath) (Heteroptera: Reduviidae)". Comparative Biochemistry and Physiology Part A: Physiology. 41 (2): 373–381, IN3–IN7. doi:10.1016/0300-9629(72)90068-0.
- ↑ Caras, R.A. Dangerous to Man. Pelican, 1975. P. 225
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