Permeation of lipophilic chemicals across plant cuticles: prediction from partition coefficients and molar volumes

1988 ◽  
Vol 17 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Franz Kerier ◽  
J�rg Sch�nherr
Keyword(s):  
Partition Coefficients ◽  
Molar Volumes ◽  
Plant Cuticles

Water permeability of plant cuticles: permeance, diffusion and partition coefficients

Trees ◽  
1986 ◽  
Vol 1 (1) ◽  
Author(s):  
Matthias Becker ◽  
Gerhard Kerstiens ◽  
J�rg Sch�nherr
Keyword(s):  
Water Permeability ◽  
Partition Coefficients ◽  
Plant Cuticles

Mobilities of organic compounds in plant cuticles as affected by structure and molar volumes of chemicals and plant species

Planta ◽  
1996 ◽  
Vol 199 (3) ◽  
Author(s):  
Peter Baur ◽  
Hend Marzouk ◽  
J�rg Sch�nherr ◽  
Hubert Bauer
Keyword(s):  
Organic Compounds ◽  
Plant Species ◽  
Molar Volumes ◽  
Plant Cuticles

Partition coefficients of plant cuticles for monoterpenes

Trees ◽  
1992 ◽  
Vol 6 (1) ◽  
Author(s):  
Christine Schmid ◽  
Rainer Steinbrecher ◽  
Hubert Ziegler
Keyword(s):  
Partition Coefficients ◽  
Plant Cuticles

Partition Coefficient Ratios and Tumour Perfusion Studied with 85mKr and 133Xe

1987 ◽  
Vol 26 (06) ◽  
pp. 253-257
Author(s):  
M. Mäntylä ◽  
J. Perkkiö ◽  
J. Heikkonen
Keyword(s):  
Partition Coefficient ◽  
Partition Coefficients ◽  
Regional Blood Flow ◽  
Blood Perfusion ◽  
Compartmental Analysis ◽  
Malignant Tumour ◽  
Mean Value ◽  
Perfusion Rate ◽  
Biological Variables ◽  
The Mean

The relative partition coefficients of krypton and xenon, and the regional blood flow in 27 superficial malignant tumour nodules in 22 patients with diagnosed tumours were measured using the 85mKr- and 133Xe-clearance method. In order to minimize the effect of biological variables on the measurements the radionuclides were injected simultaneously into the tumour. The distribution of the radiotracers was assumed to be in equilibrium at the beginning of the experiment. The blood perfusion was calculated by fitting a two-exponential function to the measuring points. The mean value of the perfusion rate calculated from the xenon results was 13 ± 10 ml/(100 g-min) [range 3 to 38 ml/(100 g-min)] and from the krypton results 19 ± 11 ml/(100 g-min) [range 5 to 45 ml/(100 g-min)]. These values were obtained, if the partition coefficients are equal to one. The equations obtained by using compartmental analysis were used for the calculation of the relative partition coefficient of krypton and xenon. The partition coefficient of krypton was found to be slightly smaller than that of xenon, which may be due to its smaller molecular weight.

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