Wood 

The SEM image shows wood shavings. The sample was prepared by 

fixation in 2.5 % glutaraldehyde (24 h), followed by washing with pH 7.4 

phosphate buffer solution (3 x 1 h). The sample was transferred to ethanol 

through a series of dilutions (25 %, 50 %, 75 %, 95 %, 100 %), and dried using the 

K850 critical point dryer. The sample was coated in 10 nm Cr using the TurboQ 

ES and imaged in a Zeiss LEO Gemini 1525 FEG-SEM.