caa a22 4500 465826296 CHVBK 20180323112150.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF00691719 doi (NATIONALLICENCE)springer-10.1007/BF00691719 Evidence for water-organized structure in the cuticular water barrier of the American cockroach, Periplaneta americana [Elektronische Daten] [J. Machin, G. Lampert] Summary: Cuticle discs cut from the wings ofPeriplaneta and cuticular lipid extracts were analysed by differential scanning calorimetry. Two major endothermic events, one beginning at 7.1±0.3°C, and the other increasing with temperature above 24.7±0.7°C, were associated with extractable lipids in intact cuticle discs. Heating progressively destroyed the molecular structures responsible for the high temperature event but had no effect on the lower one. These results complement changes in cuticle permeability observed in a recent study and thought to be associated with structural change in the cuticular water barrier. The molecular structures responsible for both events depended on the presence of water in the cuticle. Cuticular lipid extracts lack the molecular organization found in intact cuticle, even when water is present. Springer-Verlag, 1990 Periplaneta nationallicence Cockroach cuticle nationallicence Water barrier nationallicence Differential scanning calorimetry nationallicence Machin J. Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada aut Lampert G. Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada aut Journal of Comparative Physiology B Springer-Verlag 159/6(1990-11-01), 739-744 0174-1578 159:6<739 1990 159 360 https://doi.org/10.1007/BF00691719 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00691719 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Machin J. Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Lampert G. Department of Zoology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada aut NATIONALLICENCE 773 0- Journal of Comparative Physiology B Springer-Verlag 159/6(1990-11-01), 739-744 0174-1578 159:6<739 1990 159 360 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer