Allosteric regulationIn biochemistry, allosteric regulation (or allosteric control) is the regulation of an enzyme by binding an effector molecule at a site other than the enzyme's active site. The site to which the effector binds is termed the allosteric site or regulatory site. Allosteric sites allow effectors to bind to the protein, often resulting in a conformational change and/or a change in protein dynamics. Effectors that enhance the protein's activity are referred to as allosteric activators, whereas those that decrease the protein's activity are called allosteric inhibitors.
Colloidal crystalA colloidal crystal is an ordered array of colloidal particles and fine grained materials analogous to a standard crystal whose repeating subunits are atoms or molecules. A natural example of this phenomenon can be found in the gem opal, where spheres of silica assume a close-packed locally periodic structure under moderate compression. Bulk properties of a colloidal crystal depend on composition, particle size, packing arrangement, and degree of regularity.
Film d'horreurLe film d'horreur, ou film d'épouvante, est un genre cinématographique dont l'objectif est de créer un sentiment de peur, de répulsion ou d'angoisse chez le spectateur. Il est à dissocier du thriller et surtout du film fantastique, qui apporte une notion de surnaturel sans pour autant avoir pour but de provoquer la peur. Parmi les sous-genres, le slasher est l'un des plus reconnus avec des personnages de référence comme Freddy Krueger (Les Griffes de la nuit), Michael Myers (Halloween) ou encore Jason Voorhees (Vendredi 13).
Stratum (linguistics)In linguistics, a stratum (Latin for "layer") or strate is a language that influences or is influenced by another through contact. A substratum or substrate is a language that has lower power or prestige than another, while a superstratum or superstrate is the language that has higher power or prestige. Both substratum and superstratum languages influence each other, but in different ways. An adstratum or adstrate is a language that is in contact with another language in a neighbor population without having identifiably higher or lower prestige.
