Lab #7
Stress
Factors on Cellular Membranes, February 6, 2009
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 |