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essential [ɪ'senʃəl](a) (vital → action, equipment, services) essentiel, indispensable; (→ point, role) essentiel, capital; (→ question) essentiel, fondamental;∎ a well-trained workforce is essential to the success of your business un personnel qualifié est essentiel au succès de votre entreprise;∎ it is essential to know whether… il est essentiel ou il importe de savoir si…;∎ the essential thing l'essentiel m;∎ the essential thing is to relax l'essentiel est de rester calme;∎ a balanced diet is essential for good health un régime équilibré est essentiel pour être en bonne santé;∎ essential information (on package label) mentions fpl obligatoires∎ the essential goodness of man la bonté essentielle de l'homme;∎ the essential difference between them is that… la différence principale entre eux est que…2 nounobjet m indispensable;∎ the essentials l'essentiel m;∎ we can only afford to buy the essentials nous n'avons les moyens d'acheter que l'essentiel;∎ a dishwasher is an essential of a modern kitchen un lave-vaisselle est un élément indispensable dans une cuisine moderne;∎ the essentials of astronomy les rudiments mpl de l'astronomie;∎ in (all) essentials essentiellement►► Biology essential amino acid acide m aminé essentiel;essential goods biens mpl de première nécessité;essential oil huile f essentielle
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Acid-base extraction — is a procedure using sequential liquid liquid extractions to purify acids and bases from mixtures based on their chemical properties. Acid base extraction is routinely performed during the work up after chemical syntheses and for the isolation of … Wikipedia
Acid-base physiology — is the study of the acids, bases and their reactions in the body. For survival, acid base homeostasis is an absolute requirement. The traditional approach to the study of acid base physiology has been the empiric approach. The main variants are… … Wikipedia
Acid dye — is a member of a class of dye that is applied from an acidic solution. In the home or art studio, the acid used in the dyebath is often vinegar (acetic acid) or citric acid. The uptake rate of the dye is controlled with the use of sodium chloride … Wikipedia
Acid rain — is rain or any other form of precipitation that is unusually acidic. It has harmful effects on plants, aquatic animals, and infastructure. Acid rain is mostly caused by human emissions of sulfur and nitrogen compounds which react in the… … Wikipedia
Basic precipitation — occurs when calcium oxide and sodium hydroxide are emitted into the atmosphere, undergo chemical transformations, and are absorbed by water droplets in clouds. The droplets then fall to earth as rain, snow, or sleet. This can increase the pH of… … Wikipedia
Basic Analysis And Security Engine — est une interface web permettant la gestion des alertes générées par l IDS Snort. Elle permet le classement des alertes en groupe, l affichage de diagrammes et la recherche des alertes selon différents critères. BASE est un programme sous licence … Wikipédia en Français
Basic analysis and security engine — est une interface web permettant la gestion des alertes générées par l IDS Snort. Elle permet le classement des alertes en groupe, l affichage de diagrammes et la recherche des alertes selon différents critères. BASE est un programme sous licence … Wikipédia en Français
Acid-free paper — is paper that has a neutral or basic pH (7 or slightly greater). It addresses the problem of preserving documents for long periods. Overview Paper made from wood based pulp that has not had its lignin removed goes yellow and deteriorates over… … Wikipedia
Acid salt — Acid salts are a class of salts formed when a dibasic or tribasic acid has been neutralized to some degree. Because the acid is only partially neutralized, one or more replaceable protons remain. Typically this will lead to a formula with one or… … Wikipedia
acid — Since the 1960s, when acid was first used to mean the hallucinogenic drug LSD, the word has developed all the connotations of a subculture. Those taking drugs came to be called acid heads or acid freaks; and their way of life came to depend on… … Modern English usage
Basic — Ba sic, a. 1. (Chem.) (a) Relating to a base; performing the office of a base in a salt. (b) Having the base in excess, or the amount of the base atomically greater than that of the acid, or exceeding in proportion that of the related neutral… … The Collaborative International Dictionary of English