Back to TopSymptoms Â». Hardening of the arteries does not cause symptoms until blood flow to part of the body becomes slowed or blocked. If the arteries to the heart become narrow, blood flow to the heart can slow down or stop. This can cause chest pain (stable angina), shortness of breath, and other symptoms.
A useful test to identify bacteria is a carbohydrate fermentation test. Fermentation is defined as an ATP generating process where organic compounds, in this case lactose, acts as both an electron donor and acceptor.A phenol red medium, with sucrose as the sole carbohydrate source, is used to detect fermentation.Phenol red indicator gives the medium a red-orange appearance. As lactose is fermented, acidic products are generated that causes the indicator to change from red-orange to yellow.An inverted tube (Durham tube) is sometimes placed in the medium to capture gas formed as a result of fermentation.henol red indicator gives the medium a red-orange appearance. As lactose is fermented, acidic products are generated that causes the indicator to change from red-orange to yellow. An inverted tube (Durham tube) is sometimes placed in the medium to capture gas formed as a result of fermentation.
Methyl Red (MR) test is a biochemical test performed on bacterial species to detect the ability of an organism to produce stable acids end products (Mixed-acid fermentation) from supplied glucose.ome bacteria have ability to perform mixed acid fermentation of glucose in MR-VP medium. The products of mixed-acid fermentation are a complex mixture of acids, particularly lactate, acetate, succinate and formate as well as ethanol and equal amounts of H2 and CO2.