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quaternary    音标拼音: [kw'ɑtɚn,ɛri]
a. 由四要素形成的

由四要素形成的

quaternary
四进制的

quaternary
四进 四元

quaternary
adj 1: consisting of or especially arranged in sets of four;
"quaternate leaves"; "a quaternary compound" [synonym:
{quaternate}, {quaternary}]
2: coming next after the third and just before the fifth in
position or time or degree or magnitude; "the quaternary
period of geologic time extends from the end of the tertiary
period to the present" [synonym: {fourth}, {4th}, {quaternary}]
n 1: last 2 million years [synonym: {Quaternary}, {Quaternary
period}, {Age of Man}]
2: the cardinal number that is the sum of three and one [synonym:
{four}, {4}, {IV}, {tetrad}, {quatern}, {quaternion},
{quaternary}, {quaternity}, {quartet}, {quadruplet},
{foursome}, {Little Joe}]

Quaternary \Qua*ter"na*ry\, n. [L. numerus quaternarius: cf. F.
quaternaire.]
1. The number four. --Boyle.
[1913 Webster]

2. (Geol.) The Quaternary age, era, or formation. See the
Chart of {Geology}.
[1913 Webster]


Quaternary \Qua*ter"na*ry\, a. [L. quaternarius consisting of
four each, containing four, fr. quaterni four each, fr.
quattuor four: cf. F. quaternaire. See {Four}.]
[1913 Webster]
1. Consisting of four; by fours, or in sets of four.
[1913 Webster]

2. (Geol.) Later than, or subsequent to, the Tertiary;
Post-tertiary; as, the Quaternary age, or Age of man.
[1913 Webster]

41 Moby Thesaurus words for "quaternary":
Little Joe, biquadrate, biquadratic, four, four-legged,
four-part diaphony, four-rayed, foursome, foursquare, quad,
quadrangle, quadrature, quadrennium, quadric, quadrilateral,
quadrille, quadrinomial, quadrivalent, quadruped, quadruplet,
quartet, quartic, quartile, quatern, quaternion, quaternity,
quatrefoil, rectangle, square, square dance, squaring, tetractinal,
tetrad, tetragon, tetragram, tetragrammaton, tetrahedron,
tetralogy, tetraphony, tetrapody, tetravalent


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  • Quaternary Period - an overview | ScienceDirect Topics
    Quaternary Period In subject area: Earth and Planetary Sciences The Quaternary Period is defined as the most recent geologic era spanning the last 2 6 million years, divided into the Pleistocene and Holocene epochs, characterized by significant climatic oscillations and the evolution of modern flora and fauna, including Homo sapiens
  • Quaternary Environments and Humans | Journal - ScienceDirect
    Quaternary Environments and Humans (QEH) is the full Open Access, official journal of the International Union for Quaternary Research (INQUA) The journal aims to publish peer reviewed papers under the auspices of the leading Quaternary association, with a special focus on recent advances in Quaternary sciences that appeal to a wide audience and that combine approaches from several disciplines
  • Quaternary International | Journal | ScienceDirect. com by Elsevier
    Quaternary International is an international, peer-reviewed journal that embraces all aspects related to Quaternary Science It is the official journal of the International Union for Quaternary Research (INQUA) and aims to publish high-quality and impactful articles covering significant advances across all disciplines related to Quaternary
  • Quaternary Science Reviews | Journal | ScienceDirect. com by Elsevier
    Quaternary Science Advances (QSA) is an international and fully Open Access journal supporting the rapid publication of peer-reviewed original research articles, short communications and review papers dealing with all aspects of Quaternary science
  • PFAS removal from water using quaternary amine . . . - ScienceDirect
    We report on the incorporation of quaternary amines into polymerized high internal phase emulsions (polyHIPEs) and demonstrate feasibility for potenti…
  • Challenges of quaternary ammonium antimicrobial agents: Mechanisms . . .
    Abstract Quaternary ammonium compounds (QACs) served as broad spectrum antimicrobial agents are widely applied for surface disinfection, skin and mucous disinfection, and mouthwash The daily applications of QACs have significantly increased, especially during the COVID-19 pandemic
  • Antibacterial quaternary ammonium agents: Chemical diversity and . . .
    Quaternary ammonium agents, a class of organic cationic salts of substituted ammonium compounds [1], exist widely in nature, such as acetylcholine 1, betaine 2, and levocarnitine 3 (Fig 1) In the last decades, quaternary ammonium compounds (QACs) have received significant attention due to their broad application in pharmaceutical chemistry [2]
  • Recent synthetic methodology advancements towards all-carbon quaternary . . .
    Creating all-carbon quaternary centers remains a formidable challenge in synthetic organic chemistry, despite their widespread occurrence in natural products, particularly in polycyclic systems Developing methodologies to generate these asymmetric centers with high stereoselectivity presents a crucial opportunity for discovering innovative chemical reactions and synthesizing novel therapeutic
  • Highly positively charged nanofiltration membrane through bis . . .
    The quaternary ammonium group provides permanent positive charge, which is an ideal candidate for constructing the high PCD of membrane surface [[33], [34], [35], [36], [37], [38]] Therefore, the rational design of modifiers that can further increase the membrane surface PCD is in urgent need
  • Quaternary Glaciations and Chronology - ScienceDirect
    The onset of the recent ice age dates back much further than the Quaternary An overall, long-term trend of cooling global climates occurred throughout the Tertiary Period The opening of the North Atlantic Ocean, accompanied by the simultaneous closure of the east–west-aligned Tethys Ocean, characterize this period This development led to profound palaeogeographical rearrangements and





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