Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège

Glossary

Vous trouverez dans ce glossaire les définitions de termes présents dans les différents articles, classés de manière alphabétique.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
F
Factor H

A protein which regulates the alternate complement system pathway.

Fallypride

Neuroleptic chemical compound belonging to the family of substituted benzamides, which competes with cerebral dopamine for binding to the D2/D3 receptor sub-type. Fallypride is a ligand which has a higher affinity to dopamine receptors than raclopride.

false killer whale

Pseudorca crassidens is the third largest species in the Delphinidae family. They are either entirely dark grey or black, and their rounded head has almost no beak.

familial cylindromatosis

Genetic disease causing the appearance of benign tumours on the head.

Familial hemiplegic migraine

Hemiplegic migraine (HM) is a rare form of migraine with aura which is accompanied by a palsy of a hemicorpus. Family history can allow one to distinguish the cases of familial hemiplegic migraines (FHM) concerning a second or third degree blood-relation having the same attacks and the cases of sporadic hemiplegic migraine (SHM), in which the sufferers have no affected relatives. Typical HM attacks involve a motor deficiency always combined with at least one other sign of the aura, the most common being sensory, visual or language disorders. (www.ophranet.net)

famulus

A Latin word here meaning ‘servant.’

Fanconi Anemia

Named after the Swiss pediatrician who described it for the first time. This rare disease is an anemia with a strong genetic component which results in impaired bone marrow function. It generally manifests itself in early childhood. In addition to impairment of the bone marrow function, the patients show various associated malformations which vary in terms of seriousness and number as well as an increased susceptibility to certain forms of cancer.

Far right

Supporting the supposedly evident inequality between human beings, peoples, cultures, races and civilisations, the discourse of the far right advocates a hierarchical conception of social organisation based on nationalism. The latter is a political project aimed at combatting internal and external enemies of the social body, which is considered as remaining as a metaphor of the biological body.

FARC

Revolutionary Armed Forces of Colombia, or Fuerzas armadas revolucionarias de Colombia – Ejército del Pueblo. Formed in 1964 they are the military branch of the Colombian Communist Party. They have certainly over 10,000 members and occupy a significant area of Colombian territory. In 2002 they kidnapped Ingrid Betancourt, then a candidate for the Columbian presidential elections.

farthing

A British coin, produced in one form or another from the 13th century until 1956, and valued at a quarter of a penny.

fast twitch muscle fibers

Muscle fibers which can contract rapidly and strongly but whose resistance to fatigue is weak. 

Fatty acid

Fatty acids are one of the phospholipid components, the basic molecules of every cell membrane. These are long chains of –CH2 ending with a carboxylic group (-COOH). They are referred to as saturated when the carbon atoms of the chain are bonded to at least two atoms of hydrogen. If, on the other hand, two carbon atoms are bonded together, they are referred to as unsaturated. If carbon atoms are bonded together more than once, they are referred to as polyunsaturated.

Fault

In geology a fault is a rupture plane or zone along which the deformation is very cutting. This plane divides a volume of rock into two fault walls which have slipped in relation to each other. This movement and the very cutting deformation are due to forces exerted by tectonic constraints, which results from the plates’ tectonics, and to their interaction with forces of volume such as gravity.

ferroelectric

A material with a spontaneous polarisation that can be reversed by an electric field. Used in ferroelectric memories, for instance.

Ferroelectricity

FERROELECTRICITY Ferroelectricity is a property of certain materials whereby they exhibit a spontaneous and natural electric polarization. This is due to the fact that the centre of gravity of positive charges is separate from that of negative charges. This polarization can of course be reversed by applying an external electric field. For some time, this property was associated with a particular kind of salt, called Seignette’s salt or Rochelle salt (both names are used). However, a few decades ago, ferroelectric oxides with perovskite structure (a perfect stack of cubic crystals), such as PbTiO3 mentioned in the above article, were discovered.

Fertility rate

We use the term fertility rate, instead of birth rate, when the births are related to the number of women of a fertile age. The fertility rate of one generation may be resumed by its sum total of descendants while the current fertility indicator (or composite index number or sum of reduced number of births) measures the fertility rate in one year.

Fibonacci

Fibonacci is the name by which the Italian mathematician Leonardo of Pisa is known (1170-1250). A series of integers are named after him. It has remarkable properties… which many people have discovered or rediscovered thanks to the Da Vinci Code.

The Fibonacci series begins with 1, then with 2. Any element after this is obtained as the sum of the two preceding elements. Therefore, it can be written:

fibrinolysis

Dissolving of fibrin, the fibrous protein that forms a mesh and helps to form a blood clot during coagulation.

fibroblast

Cell present in connective tissue, especially in the dermis, ensuring coherence and elasticity.

Fibrosis

Development of fibrous tissues that occurs in the place where tissues (for instance, the liver, lungs, kidneys, etc.) have been destroyed during inflammation and haven't regenerated.

field

In cinema the field is everything that is filmed by the camera. The space visible to the lens, delineated by the frame.

Filial status

'Relationship connecting the child to his/her father (paternal filial status) or his/her mother (maternal filial status). More broadly, all direct parental links.'

Filipodia

Cytoplasmic projections that contain actin filaments. They play the role of antenna for a migrating cell in order to assess the environment.

fin whale (Balaenoptera Physalus)

Impressive for its size (females can measure up to 25 metres in length in the Mediterranean), this mammal is easily recognizable because it has asymmetrical pigmentation on its head: a dark grey lower left jaw and a white or light grey right lower jaw.

Finite elements

The method of finite elements is a mathematical method allowing complex equations to be solved numerically, by subdividing the area of study into smaller-sized elements.

Fish's tongue

It is bony and ends in the ‘branchial basket' which carries the gills.

Flagellum

Protein filament that allows certain cells such as spermatozoids to propel themselves.

Flammarion

One of the biggest French publishing house groups. The publishing house was founded in 1876.

Flaubert, Gustave (1821-1880)

A French writer who was both objected to (for moral reasons) and admired in his time (for his literary power), he now has the reputation as being one of the greatest writers of his century, primarily because of Madame Bovary and Sentimental Education; he is situated between the psychological novel (Stendhal) and the naturalist movement (from Zola to Maupassant, the latter considering Flaubert to be his master). Strongly marked by the work of Honoré de Balzac Flaubert’s work is framed by the latter’s innovations in the realist novel.

flexor muscles

Muscles that allow limbs to flex by decreasing the angle between bones on two sides of a joint (leg/calf, for instance).

FLO-Cert

An international and independent ‘fair trade label’ certification and monitoring organisation, based in Bonn, in Germany. This organisation responds to an obvious need:  consumers wish to be able to trust the fair trade label, all the more so in that they cannot themselves monitor if the product does indeed meet the demands of fair trade (FT), notably in terms of the prices paid to producers, sustainable production and fair trade ‘development premiums’ assigned to producers to carry out structural investment (schools, health centres, buying land, etc.). To do so, FLO-Cert had a network of 120 independent inspectors who visit, in principle each year, all the FT organisations (producers and traders) in the world, and submit a detailed report of their visits to it.

flooding hazards

This is a combination of the intensity of the flood (water depth) and the frequency (rare versus frequent flooding).

flow chemistry

Flow chemistry is an area of research that sits between chemistry and chemical engineering, where matter is transformed in a continuous flow within micro- or mesostructured channels in a micro- or mesofluidic reactor (less than 1000 µm in diameter).

Folman, Ari

An Israeli cinema screenplay writer and director. In 2008 he directed the animation documentary film, Waltz with Bachir. This film recounts in an autobiographical manner the story of a teenager enlisted into the Israeli army who witnesses the Sabra and Chatila Palestinan refugee camp massacres in the Lebanon in 1982.

Fonds Moscou

"The Moscow fund" is an important source of Belgian archives predating 1940. These archives were seized by the German army when it entered Brussels in 1940 then removed by the Soviet troops in 1945. In addition to the archives from political parties or the Ministry of Justice, the boxes from the National Defense Ministry (called the Ministry of War before 1920) constitute the main part of the archive. Despite their repatriation to Belgium in the spring of 2002, their content today remains largely unexplored, particularly from the point of view of military history. The archives of the Fonds Moscou concerning Belgian defense are currently preserved in the Royal Army Museum in Brussels.

food chain

A food chain is a linear consequence of links in an ecosystem starting from a species that eats no other species in the ecosystem and ends at a species that is eaten by no other species in the web.

force platform

A platform that measures the force exerted on its surface through sensors.

Foreclosure

In civil law, means a loss of a right (forfeit) after the expiry of a deadline. In economics and competition law, it is a situation in which a business company is deprived of access to the market.

Forensics

Forensics is a scientific field studying the tracks which have their origins in criminal activity, or in litigious procedures in civil, statuary or administrative matters.

Fossil energy

Fossil energy springs from the fossilisation of living beings. It consists, for example, of petrol, natural gas, charcoal and coal. Hundreds of millions of years old, these energies are present in limited quantities on our planet.

fossil record

This is the name given to what we know about an extinct biological group by studying all the fossilized specimens that have been discovered and studied in relation to the group in question. When there are few known fossils, the fossil record is classed as poor. Conversely, if it has been possible to discover and study several dozen fossils of a group, the fossil record is classed as good.

Fossilization

all the processes involved in changing organic matter from a dead organism into a mineral molding. To achieve a good level of fossilization, there needs to be a high rate of sedimentation and rapid burial as well as an anoxic (oxygen-free) environment.

Foucault, Michel (1926-1984)

French philosopher. In his work, he critiques forms of power, which are pervasive in society because they are involved with institutions that are omnipresent in society. In his book Discipline and Punish (1975), he described our society as a “society of discipline”, which exercises power with the help of institutions that confine individuals (the school, the military barracks, the factory, the hospital, the insane asylum, and above all, the prison system).

Fourier transform

The Fourier transform is very often used in physics to process signals. It decomposes a complex signal into a series of periodic and elementary signals, just as a melody can be broken down into a succession of notes.

Fragmentation of natural habitats

Fragmentation is the process by which the size of habitat patches are reduced and progressively isolated. Fragmentation is today often due to human intervention (deforestation, draining of damp zones or the effects of toxic waste). It can have a heavy impact on the biodiversity of both flora and fauna.

Franco-Italia

Although absent from sources, this expression encompasses a group of heterogeneous ideas used by the French in order to define the areas of Italy in their possession. Indeed, it seems to reflect a two-sided intellectual movement: on the one hand, a rereading of Italy according to French standards (“Italia”); on the other hand, a redefinition of the French themselves through their own view of Italy (“Franco”). Thanks to the oscillation between the two parties of this expression, the Franco-Italia concept suggests a perpetual toing and froing between the acculturation of Italy and the redefining of France’s identity.

Francovich ruling

The Francovich ruling of the Court of Justice (19 November 1991) established the principle of state liability to individuals for damage that they might have suffered because of that Member State’s violation of European law.
In this case, Francovich and Bonifaci, two Italian nationals to whom bankrupt employers owed salaries, took Italy to court, claiming the state of not having transposed into national law a European Directive protecting employees if their employers went insolvent (the Directive imposed on the States an obligation to enact provisions guaranteeing payment). The Italian courts referred the issue to the Court of Justice. The Court of Justice indicated that the purpose of the Directive was to confer on employees rights which they had been deprived of because of a failure on the part of Italy, which had not yet transposed the Directive into its law. Through this ruling, the Court opens to European citizens the possibility of an action for damages against the State that infringes European law.

Franks

A name derived from a Frankish root meaning ‘bold, courageous’. It designates an ensemble of Germanic peoples – the Franks – which was constituted on the right bank of the Mid and Lower Rhine River over the course of the 3rd century. Carrying out major invasions, they penetrated into Gaul between 430 and 450 before being unified under the authority of Clovis (v. 481-511). It is from this Frankish people which sprang the Merovingian and Carolingian dynasties.

free radicals

Molecules often derived from oxygen which possess one or several unpaired electrons and are highly unstable. In the human body, they try to pair their unpaired electrons by taking electrons from the organic molecules which provokes a series of reactions and alterations of the cells, or even their destruction. If the free radicals are too numerous and the reserves of antioxidants are too weak to hinder their action, the result is an imbalance which can provoke the appearance of certain illnesses such as joint or heart problems.

Frère, Walthère known as Frère-Orban (1812-1896)

A Belgian politician, the founder of the Liberal Party in 1846. He was first of all a local authority councillor (1840), an elected representative of Liège (1847), then Finance Minister from 1848 to 1852 and from 1857 to 1870, and twice Prime Minister, the first time from 1868 to 1870, the second from1878 to 1884.

Fresnel lenses

Invented by Augustin Fresnel, a French physicist who is considered to be the father of modern optics. These lenses are constructed in circular sections that allow a higher concentration of light (for example in lighthouse beacons) while also permitting a great reduction in the amount and weight of glass needed, relative to the amount required in the normal casting process for glass lenses.

(1) cross-section of a Fresnel lens (2) cross-section of a plano-convex lens of equivalent focal distance

Friedmann, Georges (1902-1977)

French sociologist and philosopher, Friedmann introduced a new industrial sociology to France.

Front populaire

In France, although the era of the Front Populaire (an electoral alliance of the communist, socialist and radical left) was really realised in 1938 under the Daladier cabinet, it remains above all associated with the Blum Government (June 1936-June 1937) which initiated significant social reforms, including the 40 hour week and paid holidays. This Blum cabinet did not include, however, any communist Ministers, and the PCF had to make do with increasingly conditional Parliamentary support.

FTAA

Free Trade Area of the Americas. The idea of such an extension nevertheless comes up against strong reticence in Latin America and the opposition of anti-globalisation movements, who consider that the freedom of market trade in no way guarantees equal rights between partners, nor a development that benefits the countries’ populations. Within the United States itself, some people accuse NAFTA of having led to delocalisations that profit Mexico and even Canada.

Fuller Loïe (1862-1928)

An American music hall artist who knew fame in Paris, at the Folies-Bergères, with her ‘Fantastic Ballets’. She remains known for having conceived of games of light on large cloths she handled during her ballets.

Fullerene

A molecular form of carbon whose geometry makes one think of a football. They were discovered in 1985 by Richard Smalley (a ULg Honoris Causa Doctor), Harold Kroto and Robert Curl, a discovery which brought them the Nobel Prize for Chemistry in 1996.

Functional magnetic resonance imaging (fMRI)

Imaging technique used to study the neural activity of the brain. It involves recording by magnetic resonance local changes in blood flow (hemodynamic responses) in certain brain regions when certain differents tasks are executed, such as cognitive or motor tasks.

Functions related to praxis

Range of cognitive processes necessary for coordination and the manipulation of voluntary movements with a precise purpose.

furan

A volatile organic compound (C4H4O), which appears in a number of foods that undergo heat treatment, such as canned and jarred foods. The occurrence in coffee in closed capsules and in jars infant food exhibits the highest levels.
The words furan and furans should not be confused. The generic name of furans is also related to dioxin-like compounds (Read on this topic : Dolphins are the sentinels of pollution in Brazil)

Fusariosis

A Common disease of plants due to a parasitic fungus which develops in the soil. It causes a blockage of the vessels thus inhibiting the growth of plants. It can also develop on the twigs or leaves of plants and produce mycotoxins.

Futuropolis

Comic strip publishing house created in 1972, focusing on publishing author comic strips. From 1994 Futuropolis sailed under the flag of Gallimard and its publishing activity slowed dramatically. In 2004 Futuropolis took on a new lease of life following a link-up between Gallimard and Soleil Production.



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