- In plant cell tissue culture, comprises inorganic salts, including all of the elements necessary for plant metabolism; organic factors (amino acids, vitamins); usually also endogenous plant growth regulators (auxins, cytokinins and often gibberellins); as well as a carbon source (sucrose or glucose).
Glossary of Biotechnology for Food and Agriculture . 2015.
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essential — I. adjective Date: 14th century 1. of, relating to, or constituting essence ; inherent 2. a. of the utmost importance ; basic, indispensable, necessary < an essential requirement for admission to college > b. being a substance that is … New Collegiate Dictionary
requirement — I noun adjuration, behest, bidding, call, claim, command, commandment, compulsion, conscription, constraint, decree, decretal, demand, dictate, direction, directive, edict, enforcement, enjoinment, essential, essential desideratum, exaction,… … Law dictionary
essential — I (inherent) adjective basal, basic, basilar, basilary, elemental, fundamental, immanent, implicit, integral, intrinsic, intrinsical, main, primary II (required) adjective basic, binding, called for, chief, compulsory, critical, crucial, demanded … Law dictionary
essential — [ə sen′shəl, isen′shəl] adj. [ME essencial < LL essentialis: see ESSENCE] 1. of or constituting the intrinsic, fundamental nature of something; basic; inherent [an essential difference] 2. absolute; complete; perfect 3. absolutely necessary;… … English World dictionary
requirement — requirement, requisite, prerequisite can all mean something that is regarded as necessary to the success or perfection of a thing. Although requirement, the more general term, may be employed in place of requisite, it is the customary term when… … New Dictionary of Synonyms
essential — [adj1] important, vital capital, cardinal, chief, constitutive, crucial, foremost, fundamental, imperative, indispensable, leading, main, necessary, necessitous, needed, needful, prerequisite, principal, required, requisite, righthand, wanted;… … New thesaurus
Requirement — Re*quire ment ( ment), n. 1. The act of requiring; demand; requisition. [1913 Webster] 2. That which is required; an imperative or authoritative command; an essential condition; something needed or necessary; a need. [1913 Webster] One of those… … The Collaborative International Dictionary of English
essential element — es·sen·tial element n: an element of a tort or esp. a crime that must be alleged in the complaint or charging instrument (as the indictment) in order to make out a prima facie case Merriam Webster’s Dictionary of Law. Merriam Webster. 1996.… … Law dictionary
essential desideratum — index prerequisite, requirement Burton s Legal Thesaurus. William C. Burton. 2006 … Law dictionary
essential — I (New American Roget s College Thesaurus) adj. substantial, material, constitutional, fundamental, elementary, absolute; necessary, needful, requisite, cardinal, indispensable, vital; inherent, intrinsic, basic. See necessity, part, importance.… … English dictionary for students