midpiecen.

Brit.

/ˈmɪdpiːs/, U.S.

/ˈmɪdpis/

Origin: Formed within English, by compounding. Etymons: mid adj., piece n.

Etymology: < mid adj. + piece n. Compare earlier middle piece n. In sense 2 after German Mittelstück (E. Brand 1907, in Berliner Klin. Wochenschr. 26 Aug. 1078/1).

a. Chiefly Biology. A middle section or part of a structure, organism, etc.

ΚΠ

1886 Amer. Naturalist 20 346 A chitin-bar produced by thickening of the intima, consisting of a groove-like mid-piece.

1937 Proc. National Acad. Sci. U.S.A. 23 153 A part of a row or the entire row was then removed from the remaining mid-piece of the animal.

1945 Sci. Monthly July 28 (caption) Mid-piece of toggle assembly.

1970 Amer. Jrnl. Bot. 57 745/2 A centrosome consisting of two globular ends connected by a midpiece.

1985 Cambr. Encycl. Life Sci. i. 20/1 Attached by a collar to the DNA-containing head is a tubular contractile mid-piece, capable of injecting the DNA into the bacterial cell.

1993 Mycol. Res. 97 199/2 A spindle pole body was positioned on the surface of the nuclear envelope and was composed of two slightly concave discs separated by a midpiece.

b. Cell Biology. A region of the spermatozoon located behind the neck and ensheathed in closely-packed mitochondria. Cf. middle piece n. 4.

ΚΠ

1949 Amer. Naturalist 83 208 If sea urchin sperm is treated in such a way as to extract some antifertilizin,..the head of the sperm between the acrosome and midpiece becomes spherical and slightly swollen.

1964 Science 13 Nov. 958/3 Sperm mid-pieces show a striking response to cytochrome c.

1975 Nature 1 May 75/2 In another experiment the oxygen uptake of ram spermatozoal mid-pieces, which are essentially mitochondria, was monitored.

1996 Guardian 9 Mar. (Weekend Suppl.) 23/2 It takes 72 days for the germ cells to mature into streamlined adult sperm, complete with head, midpiece, and whiplike tail.

2. Immunology. A component of complement identified in the euglobulin fraction (consisting chiefly of the first component, C1) (see quot. 1920). Now historical.

ΚΠ

1913 Zeitschr. f. Immunitätsforschung 20 39 If the result is due to persensitisation, there must be specific sheep mid pieces which have no effect on the human system.

1920 Jrnl. Gen. Physiol. 3 199 Exposure of sensitized red blood cells to the globular or ‘mid-piece’ fraction results in a change which makes them susceptible of lysis by the albumin fraction, which is therefore supposed to combine with some element in the red blood cells indirectly through the ‘mid-piece’. It is for this reason that the albumin fraction has received the name ‘end-piece’.

1941 Science 7 Nov. 437/2 It is evident from these diagrams that the terms ‘mid-piece,’ ‘end-piece,’ ‘albumin fraction,’ ‘globulin fraction’ are misleading and unsatisfactory. Therefore, it is suggested that the four components of complement be designated by the following symbols: C′1—mid-piece.

1988 A. M. Silverstein Hist. Immunol. ix. 243 Ferrata in 1907 showed that hypotonic solution would separate complement into two inactive fractions, called midpiece and endpiece (later the basis for complement components one and two).

This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022).

单词	midpiece
释义	midpiecen. Brit. /ˈmɪdpiːs/, U.S. /ˈmɪdpis/ Origin: Formed within English, by compounding. Etymons: mid adj., piece n. Etymology: < mid adj. + piece n. Compare earlier middle piece n. In sense 2 after German Mittelstück (E. Brand 1907, in Berliner Klin. Wochenschr. 26 Aug. 1078/1). 1. a. Chiefly Biology. A middle section or part of a structure, organism, etc. ΚΠ 1886 Amer. Naturalist 20 346 A chitin-bar produced by thickening of the intima, consisting of a groove-like mid-piece. 1937 Proc. National Acad. Sci. U.S.A. 23 153 A part of a row or the entire row was then removed from the remaining mid-piece of the animal. 1945 Sci. Monthly July 28 (caption) Mid-piece of toggle assembly. 1970 Amer. Jrnl. Bot. 57 745/2 A centrosome consisting of two globular ends connected by a midpiece. 1985 Cambr. Encycl. Life Sci. i. 20/1 Attached by a collar to the DNA-containing head is a tubular contractile mid-piece, capable of injecting the DNA into the bacterial cell. 1993 Mycol. Res. 97 199/2 A spindle pole body was positioned on the surface of the nuclear envelope and was composed of two slightly concave discs separated by a midpiece. b. Cell Biology. A region of the spermatozoon located behind the neck and ensheathed in closely-packed mitochondria. Cf. middle piece n. 4. ΚΠ 1949 Amer. Naturalist 83 208 If sea urchin sperm is treated in such a way as to extract some antifertilizin,..the head of the sperm between the acrosome and midpiece becomes spherical and slightly swollen. 1964 Science 13 Nov. 958/3 Sperm mid-pieces show a striking response to cytochrome c. 1975 Nature 1 May 75/2 In another experiment the oxygen uptake of ram spermatozoal mid-pieces, which are essentially mitochondria, was monitored. 1996 Guardian 9 Mar. (Weekend Suppl.) 23/2 It takes 72 days for the germ cells to mature into streamlined adult sperm, complete with head, midpiece, and whiplike tail. 2. Immunology. A component of complement identified in the euglobulin fraction (consisting chiefly of the first component, C1) (see quot. 1920). Now historical. ΚΠ 1913 Zeitschr. f. Immunitätsforschung 20 39 If the result is due to persensitisation, there must be specific sheep mid pieces which have no effect on the human system. 1920 Jrnl. Gen. Physiol. 3 199 Exposure of sensitized red blood cells to the globular or ‘mid-piece’ fraction results in a change which makes them susceptible of lysis by the albumin fraction, which is therefore supposed to combine with some element in the red blood cells indirectly through the ‘mid-piece’. It is for this reason that the albumin fraction has received the name ‘end-piece’. 1941 Science 7 Nov. 437/2 It is evident from these diagrams that the terms ‘mid-piece,’ ‘end-piece,’ ‘albumin fraction,’ ‘globulin fraction’ are misleading and unsatisfactory. Therefore, it is suggested that the four components of complement be designated by the following symbols: C′1—mid-piece. 1988 A. M. Silverstein Hist. Immunol. ix. 243 Ferrata in 1907 showed that hypotonic solution would separate complement into two inactive fractions, called midpiece and endpiece (later the basis for complement components one and two). This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022). < n.1886
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