caa a22 4500 463216903 CHVBK 20180405153159.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00226-006-0121-6 doi (NATIONALLICENCE)springer-10.1007/s00226-006-0121-6 Donaldson Lloyd Cellwall Biotechnology Centre, Scion, Private Bag 3020, Rotorua, New Zealand aut Cellulose microfibril aggregates and their size variation with cell wall type [Elektronische Daten] [Lloyd Donaldson] The organization of wood cell wall components involves aggregates of cellulose microfibrils and matrix known as macrofibrils. A combination of field emission electron microscopy and environmental scanning electron microscopy was used to visualise the organization of macrofibrils in different cell wall types comparing normal and reaction wood of radiata pine and poplar as examples of a typical softwood and hardwood. The size of macrofibrils is shown to vary among cell wall types with the smallest structures occurring in the gelatinous layer of tension wood (14nm) and the largest structures in the S2L layer of compression wood (23nm). A positive correlation between macrofibril size and degree of lignification is observed, with macrofibrils apparently increasing in size in more highly lignified cell wall types. The fibrillar structure of the secondary wall varies from microfibril-sized structures of 3-4nm up to large aggregates of 60nm diameter. The size of macrofibrils also varies slightly among adjacent cells of the same cell wall type. Macrofibrils occur predominantly in a random arrangement, although radial and tangential lamellae may sometimes be seen in individual cells. Springer-Verlag, 2007 Wood Science and Technology Springer-Verlag 41/5(2007-06-01), 443-460 0043-7719 41:5<443 2007 41 226 https://doi.org/10.1007/s00226-006-0121-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-006-0121-6 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Donaldson Lloyd Cellwall Biotechnology Centre, Scion, Private Bag 3020, Rotorua, New Zealand aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/5(2007-06-01), 443-460 0043-7719 41:5<443 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer