APPENDIX 

 Table 132. — Dimensions of Microorganisms 



397 



Sacch. 



cerevisiae 



Bad. 

 coli 



Bacterio- 

 phage 



Length 



Diameter 



Volume of 1 cell 



Weight of 1 cell 



Surface of 1 cell 



Moisture content 



1 mg. of dry cells contains . 



1 mg. of moist cells con- 

 tains 



Surface of 1 mg. of moist 

 cells 



Number of cells per c.c. 

 of full grown culture . . . 



Weight of cells in 1 

 one liter of full \ , 

 grown culture j 



Surface of cells per liter of 

 full grown culture 



7.2/i 

 5.6/i 



118ju3 

 130 • 10-5 mg. 



118^2 



70% 

 26 • 10« cells 

 7 . 7 • 106 cells 

 30 cm.2 



50 . 10^ 



6.5 gm. 

 1.95 gm. 



5.9 m.2 



(60 square 



feet) 



1.5/* 

 0.8m 



0.75/X3 

 8 • 10-10 mg. 



4.77/^2 



73.35% 

 4.5- 109 

 1.25- 109 

 60 cm. 2 



109 



800 mg. 

 220 mg. 



4.7 m.2 



(50 square 



feet) 



20mn 

 20m/x 



4.2- 10- V' 

 1.25- 10- V 



225 -1012 cells 

 2,800 cm. 2 



1011 

 . 42 mg. 



0.125 m.2 



(1 square 



foot) 



Their number in a good medium has been estimated to IQii per c.c. 

 (d'Herelle p. 98). This means 4.2 X IQ-^^ X 10^^ = 4.2 X 10"'' or 

 0.004 mm. 3 of bacteriophage per c.c. of a full grown culture. Even 

 in a liter of medium, their total moist weight would be only half a 

 milligram, their number totalling about lO^*. 



The yeasts are much larger than bacteria. An average-sized 

 bread-yeast cell has the dimensions of about 7.2 X 5.6/i, according to 

 Henneberg, the variation with age being very great. 



The volume of one such cell would be that of an ellipsoid 



^i X TT X 3.6 X 2.8 X 2.8 = USjjl' 



