Biology Reference
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Surface occupied
by all the
linoids of the
chromocytes
(b) .
Amount of
blood used
for the
analysis.
Total surface
of the
chromocytes
(a) .
No. of
chromocytes
per c.mm.
Surface
of one
chromocyte
Animal.
Factor a : b .
sq .
ยต
gm .
sq . m .
sq . m .
Dog A
40
10
8,000,000
6,890,000
98
90
31.3
6.2
62
2
2
12.2
Sheep 1
10
9
9,900,000
9,900,000
29.8
29.8
2.95
2.65
6.2
5.8
2.1
2.2
Rabbit A
10
5,900,000
5,900,000
5,900,000
92.5
92.5
92.5
5.46
5.46
0.27
9.9
8.8
0.54
1.8
1.6
2
10
0.5
Rabbit B
1
6,600,000
6,600,000
74.4
0.49
4.9
4.9
0.96
9.8
9.8
2
2
2
10
10
74.4
6,600,000
74.4
Guinea Pig A
1
5,850,000
89.8
89.8
0.52
1.02
0.97
2
1.9
1
5,850,000
0.52
Goat 1
1
1
16,500,000
20.1
20.1
0.33
0.33
0.66
0.69
6.1
6.8
0.63
2
2.1
1.8
2
1.9
16,500,000
10
10
19,300,000
17.8
3.34
3.34
19,300,000
17.8
1
19,300,000
17.8
0.33
Man.
1
1
4,740,000
4,740,000
99.4
99.4
0.47
0.47
0.92
0.89
2
1.9
FIGURE 2.12 Data table from the Gorter and Grendel 1925 paper indicating that there was enough lipid in the
plasma membrane of erythrocytes to surround the cell exactly twice. This is the first experimental support for the
existence of a lipid bilayer. The table is taken from [4] .
the universal importance of their conclusion, they obtained erythrocytes from different
animals including man, rabbit, dog, guinea pig, sheep, and goat. All produced the same
results. The paper ends, 'It is clear that all our results fit in well with the supposition that
the chromocytes (erythrocytes) are covered by a layer of fatty substances that is two mole-
cules thick'.
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