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  2. Edexcel - Wikipedia

    en.wikipedia.org/wiki/Edexcel

    Edexcel (also known since 2013 as Pearson Edexcel) [2] is a British multinational education and examination body formed in 1996 and wholly owned by Pearson plc since 2005. It is the only privately owned examination board in the United Kingdom. [3] Its name is a portmanteau term combining the words education and excellence.

  3. A-level - Wikipedia

    en.wikipedia.org/wiki/A-level

    The A-level (Advanced Level) is a subject-based qualification conferred as part of the General Certificate of Education, as well as a school leaving qualification offered by the educational bodies in the United Kingdom and the educational authorities of British Crown dependencies to students completing secondary or pre-university education. [1]

  4. International General Certificate of Secondary Education

    en.wikipedia.org/wiki/International_General...

    [12] The change from an A*-G grading system to a 9-1 grading system by English GCSE qualifications has led to a 9-1 grade International General Certificate of Secondary Education being made available. [13] Before, this qualification was graded on an 8-point scale from A* to G with a 9th grade “U” signifying “Ungraded”.

  5. A-level (United Kingdom) - Wikipedia

    en.wikipedia.org/wiki/A-level_(United_Kingdom)

    The O grade was equivalent to a GCE Ordinary Level pass which indicated a performance equivalent to the lowest pass grade at Ordinary Level.. Over time, the validity of this system was questioned because, rather than reflecting a standard, norm referencing simply maintained a specific proportion of candidates at each grade, which in small cohorts was subject to statistical fluctuations in ...

  6. Histone acetylation and deacetylation - Wikipedia

    en.wikipedia.org/wiki/Histone_acetylation_and_de...

    There are a total of four classes that categorize Histone Deacetylases (HDACs). Class I includes HDACs 1, 2, 3, and 8. Class II is divided into two subgroups, Class IIA and Class IIB. Class IIA includes HDACs 4, 5, 7, and 9 while Class IIB includes HDACs 6 and 10. Class III contains the Sirtuins and Class IV contains only HDAC11.

  7. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    WELMEC was established in 1990 to promote cooperation in the field of legal metrology in the European Union and among European Free Trade Association (EFTA) member states. [23] In the United States legal metrology is under the authority of the Office of Weights and Measures of National Institute of Standards and Technology (NIST), enforced by ...