Réaction organiqueLes réactions organiques sont des réactions chimiques impliquant des composés organiques. Les principaux types de réactions organiques sont l'élimination, l'addition, la substitution, le réarrangement et les réactions d'oxydoréduction impliquant des composés organiques. Ces réactions sont utilisées en synthèse organique pour construire de nouvelles molécules organiques. La production de nombreuses substances chimiques, comme les médicaments, les plastiques, les additifs alimentaires, etc., met en jeu des réactions organiques.
Light skinLight skin is a human skin color that has a base level of eumelanin pigmentation that has adapted to environments of low UV radiation. Light skin is most commonly found amongst the native populations of Europe and Northeast Asia as measured through skin reflectance. People with light skin pigmentation are often referred to as "white" although these usages can be ambiguous in some countries where they are used to refer specifically to certain ethnic groups or populations.
Hémocyaninevignette|L'hémocyanine oxydée, appelée oxyhémocyanine, donne sa coloration bleue violette au « sang » de l' Escargot de Bourgogne. vignette|Limulus polyphemus, une limule. L'hémocyanine, couramment symbolisée par Hc, est un pigment respiratoire de la famille moléculaire des métalloprotéines contenant du cuivre ayant pour fonction de transporter l'oxygène chez certains animaux parmi lesquels des arthropodes (crustacés, arachnides, limules, certains insectes) et des mollusques (bivalves, gastéropodes, coléoïdes notamment).
BioadhesiveBioadhesives are natural polymeric materials that act as adhesives. The term is sometimes used more loosely to describe a glue formed synthetically from biological monomers such as sugars, or to mean a synthetic material designed to adhere to biological tissue. Bioadhesives may consist of a variety of substances, but proteins and carbohydrates feature prominently. Proteins such as gelatin and carbohydrates such as starch have been used as general-purpose glues by man for many years, but typically their performance shortcomings have seen them replaced by synthetic alternatives.
