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tetrad |
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tetrad 1. a group or series of four 2. the number four 3. Botany a group of four cells formed by meiosis from one diploid cell 4. Genetics a four-stranded structure, formed during the pachytene stage of meiosis, consisting of paired homologous chromosomes that have each divided into two chromatids 5. Chem an element, atom, group, or ion with a valency of four 6. Ecology a square of 2 × 2 km used in distribution mapping tetrad [′te‚trad] (cell and molecular biology) A group of four chromatids lying parallel to each other as a result of the longitudinal division of each of a pair of homologous chromosomes during the pachytene and later stages of the prophase of meiosis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Since early reports of endocarditis caused by gram-positive cocci that appear in tetrads and packets often did not reliably differentiate between micrococci and phenotypically similar microorganisms, such as coagulase-negative staphylococci, the frequency of micrococcal endocarditis is difficult to ascertain and might be underestimated. On November 10, the staff of the hospital parasitology laboratory identified intraerythrocytic ring forms and tetrads consistent with B. viridans was made on the basis of the following characteristics: catalase negativity, [Alpha]-hemolytic gram-positive cocci forming pairs and tetrads (not chains) in broth culture; growth in the presence of 40% bile and 6. |
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