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B1 cells are a sub-class of B cell lymphocytes that are involved in the humoral immune response. They are not part of the adaptive immune system , as they have no memory, but otherwise, B1 cells perform many of the same roles as other B cells: making antibodies against antigens and acting as antigen-presenting cells .
GCSE Bitesize was launched in January 1998, covering seven subjects. For each subject, a one- or two-hour long TV programme would be broadcast overnight in the BBC Learning Zone block, and supporting material was available in books and on the BBC website. At the time, only around 9% of UK households had access to the internet at home.
The International General Certificate of Secondary Education (IGCSE) is an English language based secondary qualification similar to the GCSE and is recognised in the United Kingdom as being equivalent to the GCSE for the purposes of recognising prior attainment. [1] It was developed by Cambridge Assessment International Education.
Cytochrome b is a protein found in the membranes of aerobic cells. In eukaryotic mitochondria (inner membrane) and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III (EC 1.10.2.2) — also known as the bc1 complex or ubiquinol-cytochrome c reductase.
The Singapore-Cambridge General Certificate of Education Ordinary Level (or Singapore-Cambridge GCE O-Level) is a GCE Ordinary Level examination held annually in Singapore and is jointly conducted by the Ministry of Education (MOE), Singapore Examinations and Assessment Board (SEAB) and the University of Cambridge Local Examinations Syndicate (UCLES). [1]
Aflatoxin B 1 is considered the most toxic and is produced by both Aspergillus flavus and Aspergillus parasiticus. Aflatoxin M 1 is present in the fermentation broth of Aspergillus parasiticus, but it and aflatoxin M 2 are also produced when an infected liver metabolizes aflatoxin B 1 and B 2.