M.J. Berridge, J.E. Treherne, V.B. Wigglesworth (Eds.)'s Advances in Insect Physiology, Vol. 15 PDF

By M.J. Berridge, J.E. Treherne, V.B. Wigglesworth (Eds.)

ISBN-10: 012024215X

ISBN-13: 9780120242153

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1 Thin-section appearance In thin section (Figs 3 and 6, insert) pleated septate junctions can be distinguished by the regular intercellular spacing of the membranes which are fairly rigidly separated by 15 nm. The intercellular space is punctuated by septa of uniform thickness (normally 8-9 nm, although Caveney and Podgorski (1975) reported septa only 2-3 nm wide in Tenebrio epidermis) which in some areas may show a periodic separation (the precise spacing Fig. 3 Pleated septate junction from the tracheole investment of the eye of the locust, Schistocerca gregaria showing the regular interseptal distance and prominent septa typical of this junction in thin-section.

L'hc ril,lx)n\ :'un together in more 01- les\ pi-:ilIel t>;ind\ with occ;ision;il iii-cas w h e r e the tight n e \ 4 o f pa c I\ ing 1 ()o\c n \ ;I n d in d iv id 11;I I \c p t ;I ;I cc()ni p I is ti w h (1I- I \ o I- I o o ps alone ( w e . f o r example. acn d Ncirot, 1953). e and N o i l - o t . so reve;il\ that there i s con\idcral,le \ a r i ; i t r o n in the thickne\\ o f t h e w p t a a n d t h ; i t an individual septum inah var! in thicknes4 a l o n g i t \ Icngth ( f r o n i 3- 1 1 rim.

B. (1975). Incorporation of lipid into the epicuticle of Rhodnius (Hemiptera). J . Cell Sci. 19, 459-485 This Page Intentionally Left Blank Intercellular Junctions in Insect Tissues Nancy J. Lane and Helen leB. Skaer A. R. C. 1 Historical introduction: d o tight junctions exist in insect tissues? 3 Model derived from structural evidence 131 35 120 N A N C Y J. L A N E A N D HELEN leB. 3 Correlation of insect physiology with junctional structure Acknowledgements 183 References 184 182 GLOSSARY O F TERMS smooth septate junction = continuous junction zonula adhaerens = belt desmosome fascia adhaerens = discontinuous belt desmosome macula adhaerens = spot desmosome gap junction = nexus = macula comrnunicans = close junction tight junction = zonula occludens = occluding junction terminal bar = zonula adhaerens plus zonula occludens The material illustrated in the plates derives from adult specimens unless otherwise stated 1 Introduction Over recent years the number of studies on intercellular junctions in invertebrate tissues has enormously increased.

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Advances in Insect Physiology, Vol. 15 by M.J. Berridge, J.E. Treherne, V.B. Wigglesworth (Eds.)

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