| 释义 |
periplasm|ˈpɛrɪplæz(ə)m|
[mod. (De Bary 1881) f. Gr. περί around + πλάσµα anything formed: see plasm.]
1. Bot. The portion of the protoplasm in the sexual organs of the Peronosporeæ, left over after the differentiation of the sexual cells.
1887tr. De Bary's Morphol. Fungi v. 134 The space between the oosphere and the wall of the oogonium continues to be filled with a slightly granular hyaline protoplasm, the periplasm, which may easily be overlooked.
2. Microbiology. The region of a bacterial or other cell immediately within the cell wall, outside the plasma membrane. Hence periˈplasmic a.
1961P. Mitchell in Goodwin & Lindberg Biol. Struct. & Function II. 590 Observations forced us to the conclusion that the glucose-6-phosphatase of intact Escherichia coli is enclosed in a region between the cell wall and the surface of the osmotic barrier component which we might appropriately call the ‘periplasm’. 1967Science 16 June 1453/3 Some time ago Mitchell proposed that glucose-6-phosphatase activity is located in such a ‘periplasmic space’. 1974Jrnl. Bacteriol. CXIX. 243/2 To determine whether the Hg(II)-reducing activity is present in the cytoplasm, the periplasm, or both. Ibid. 244/1 Alkaline phosphatase is one of the periplasmic enzymes. 1978Sci. Amer. Oct. 74/2 The rat proinsulin would then ‘hitch-hike’ with the bacterial penicillinase into the periplasmic space, from which it could be extracted and then assayed with an antibody technique. |