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Table 1.

Definition of symbols and their values

SymbolMeaningUnitsValue
a Measured equatorial axis of egg of M. sexta 7.84×10–4 
c Measured polar axis of egg of M. sexta 6.84×10–4 
Ci Concentration of oxygen at position i mol m–3  
C Concentration of oxygen in bulk atmosphere (at 25°C) mol m–3 8.583 
Dair Diffusion coefficient of oxygen in air m2 s–1 2.09×10–5 
Di Diffusion coefficient in layer i m2 s–1  
di Thickness of layer i  
e Ellipticity None 0.489 
Hi Thermodynamic partition coefficient None  
J Flux of oxygen into an egg of M. sexta mol s–1 m–2 1.09×10–6 
kE External mass transfer coefficient m s–1  
kI Internal mass transfer coefficient m s–1  
km Overall mass transfer coefficient m s–1 1.9×10–7 
K Permeability coefficient mol s–1 m–2 kPa–1  
L Characteristic length of leaf 0.1 
l Average distance between aeropyles 3×10–5 
R Radius of an egg if it were perfectly spherical 7.5×10–4 
r Radius of a single aeropyle  
Surface area of Manduca egg m2 7.07×10–6 
Wind speed m s–1  
α Fraction of chorion surface occupied by aeropyles None 1.39×10–4 
β Capacitance coefficient mol m–3 kPa–1  
ϵ Fraction of trabecular layer that is air None 0.7 
ν Kinematic viscosity of air m2 s–1 1.6×10–5 
τ Tortuosity of trabecular layer None 
SymbolMeaningUnitsValue
a Measured equatorial axis of egg of M. sexta 7.84×10–4 
c Measured polar axis of egg of M. sexta 6.84×10–4 
Ci Concentration of oxygen at position i mol m–3  
C Concentration of oxygen in bulk atmosphere (at 25°C) mol m–3 8.583 
Dair Diffusion coefficient of oxygen in air m2 s–1 2.09×10–5 
Di Diffusion coefficient in layer i m2 s–1  
di Thickness of layer i  
e Ellipticity None 0.489 
Hi Thermodynamic partition coefficient None  
J Flux of oxygen into an egg of M. sexta mol s–1 m–2 1.09×10–6 
kE External mass transfer coefficient m s–1  
kI Internal mass transfer coefficient m s–1  
km Overall mass transfer coefficient m s–1 1.9×10–7 
K Permeability coefficient mol s–1 m–2 kPa–1  
L Characteristic length of leaf 0.1 
l Average distance between aeropyles 3×10–5 
R Radius of an egg if it were perfectly spherical 7.5×10–4 
r Radius of a single aeropyle  
Surface area of Manduca egg m2 7.07×10–6 
Wind speed m s–1  
α Fraction of chorion surface occupied by aeropyles None 1.39×10–4 
β Capacitance coefficient mol m–3 kPa–1  
ϵ Fraction of trabecular layer that is air None 0.7 
ν Kinematic viscosity of air m2 s–1 1.6×10–5 
τ Tortuosity of trabecular layer None 
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