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Although this mechanism is an elegant response to short-term bacterial infection, it can cause problems when it goes on so long that the body is deprived of needed iron for red cell production. Inflammatory cytokines stimulate the liver to produce the iron metabolism regulator protein hepcidin, that reduces available iron.
3D representation of a living cell during the process of mitosis, example of an autopoietic system. The term autopoiesis (from Greek αὐτo-(auto) 'self' and ποίησις () 'creation, production'), one of several current theories of life, refers to a system capable of producing and maintaining itself by creating its own parts. [1]
Ferrochrome or ferrochromium (FeCr) is a type of ferroalloy, that is, an alloy of chromium and iron, generally containing 50 to 70% chromium by weight. [ 1 ] [ 2 ] Ferrochrome is produced by electric arc carbothermic reduction of chromite .
Metabolic rift is a theory of ecological crisis tendencies under the capitalist mode of production that sociologist John Bellamy Foster ascribes to Karl Marx.Quoting Marx, Foster defines this as the "irreparable rift in the interdependent process of social metabolism".
According to Thomas Laqueur, [1] prior to the eighteenth century the predominant model for a social understanding of the body was the "one sex model/one flesh model".It followed that there was one model of the body which differed between the sexes and races, for example, the vagina was simply seen as a weaker version of the penis and even thought to emit sperm.
Niklas Luhmann was a prominent sociologist and social systems theorist who laid the foundations of modern social system thought. [5] He based his definition of a "social system" on the mass network of communication between people and defined society itself as an "autopoietic" system, meaning a self-referential and self-reliant system that is ...
The production of siderophores also requires the bacterium to expend energy. Thus, siderophore production can be looked at as an altruistic trait because it is beneficial for the local group but costly for the individual. This altruistic dynamic requires every member of the cellular population to equally contribute to siderophore production.
Iron deficiency, or sideropenia, is the state in which a body lacks enough iron to supply its needs. Iron is present in all cells in the human body and has several vital functions, such as carrying oxygen to the tissues from the lungs as a key component of the hemoglobin protein, acting as a transport medium for electrons within the cells in the form of cytochromes, and facilitating oxygen ...