If bacterium cannot use glucose the fermentation tube will stay the same color. Gas may also occur inside the fermentation tube.
To differentiate acid production by glucose and lactose fermentation in a test tube one must look at the neck and the butt of the test tube. Different colors indicate fermentation or non-fermentation.
it is called lactose fermentation and it yields lactic acid + gas .....the acid can be recognized by chemical indicator ( Bromocresol) and the gas can be recognized my trapping the gas in an inverted tube ( Durham tube ).
Hydrogen and carbon dioxide
A Durham fermentation tube is a test tube that has a second inverted tube inside used to capture fermented gas (CO2) byproducts of bacteria. Typically the tube has a pH indicator in it, like phenol red, that will change color when acid is present (in this case to yellow). Gases are trapped inside the Durham tube, while the indicator shows the production of acid. Low pH is caused by Lactic Acid.
A Smith fermentation tube is a tube that is used for the fermentation of carbohydrates. It also collects any gases that result from the fermentation.
If bacterium cannot use glucose the fermentation tube will stay the same color. Gas may also occur inside the fermentation tube.
To differentiate acid production by glucose and lactose fermentation in a test tube one must look at the neck and the butt of the test tube. Different colors indicate fermentation or non-fermentation.
Smith fermentation tube has a closed vertical arm which extends into a bulbous portion with tapered opening. it is used in observing an organism doing anaerobic fermentation.
Diego
it is called lactose fermentation and it yields lactic acid + gas .....the acid can be recognized by chemical indicator ( Bromocresol) and the gas can be recognized my trapping the gas in an inverted tube ( Durham tube ).
These are both used as pH indicators.
Hydrogen and carbon dioxide
not sure bro
A Durham fermentation tube is a test tube that has a second inverted tube inside used to capture fermented gas (CO2) byproducts of bacteria. Typically the tube has a pH indicator in it, like phenol red, that will change color when acid is present (in this case to yellow). Gases are trapped inside the Durham tube, while the indicator shows the production of acid. Low pH is caused by Lactic Acid.
These are both used as pH indicators.
no