Lab #7

Stress Factors on Cellular Membranes, February 6, 2009

 

Stress Treatment (6) Data Tables

I suggest,  in your lab report, that you examine this data, interpret the implications (if any), and construct individual graphs for each treatment.  Remember that there was a control for each treatment designated in bold and  with an *. 

 

1. Ethyl Alcohol Treatment

% Alcohol

Light Absorbance (%)  Colorimeter set for blue light wavelength (450 nm)

*0

26

20

.54

50

62

80

81

100

83

 

2. Detergent

Number of Detergent Drops

Light Absorbance (%)

*0

30

1

86

2

87

3

74

4

81

 

3. Osmotic Pressure

NaCl Concentration, moles/liter

Light Absorbance (%)

*0

28

0.2 moles/liter

29

0.5 moles/liter

30

0.8 mole/liter

37

1.0 moles/liter

48

 

4. Hydrogen Peroxide

% H2O2

Light Absorbance (%)

*0

25

20%

39

50%

45

80%

44

100%

46

 

 

 5. pH

 acidity/alkalinity

Light Absorbance (%)

strong acid

75

medium acid

,44

 weak acid
.46

*7  pure water

20

mild base

8

 

6. Temperature

0 Centigrade

Light Absorbance (%)

ice water

25

cool water

22

room temp.

 28

warm water

37

near boiling

91