mesosomen.
/ˈmɛsə(ʊ)səʊm/, U.S. /ˈmɛzəˌsoʊm/; see also meso- comb. form. 1. Zoology. = mesosoma n.
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1942 Ecology 23 427/2 The form from Connecticut, lacking longitudinal ribs on the dorsal side of [the] mesosome and possessing a short telson, was identified as Platyarthus hoffmanseggi Brandt, 1833.
1944 R. Matheson Entomol. for Introd. Courses iii. 61 (caption) The genitalia of a male mosquito (Culex pipens)... Mes, mesosome.
1962 D. Nichols Echinoderms xiv. 174 The lophophore itself is borne by the mesosome, and there is a strong partition between this division of the body and the metasome.
1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxviii. 165/1 The lophophore and its tentacles develop from the mesosome.
2. Microbiology. Any of the intracellular, often lamellar membranous structures (of unknown function, and possibly artefactual) found in many bacteria.
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the world > life > biology > organism > micro-organism > bacterium > [noun] > part of
capsule1883
conidium1925
macroconidium1930
nucleoid1938
muramic acid1957
mucopeptide1959
mesosome1960
rhapidosome1963
murein1964
peptidoglycan1966
1960 P. C. Fitz-James in Jrnl. Biophys. & Biochem. Cytol. 8 508/2 This [sc. dense body] is probably an unsuitable name. Certainly they are not always electron dense... Since they appear to be attached to the surface membranes of the cell, one should adopt the suggestion of Robertson..for such membrane-attached cytoplasmic structures and use the term ‘mesosomes’.
1974 Nature 1 Feb. 303/1 These properties together with the possession of fimbriae and the absence of mesosomes are commonly shared by Gram-negative, but generally absent in Gram-positive bacteria.
1991 Microbiol. & Immunol. 35 623 Multilayer membranous structures, similar to the mesosomes of gram-negative bacteria, were sometimes seen in the rickettsial cells.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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n.1942