Table of Contents
Is Serratia marcescens UV resistant?
White mutants of Serratia marcescens, which do not produce the nonessential pigment prodigiosin, were found to be more resistant to killing by ultraviolet light (UV) than the red-wild type. Pigment induction in a white mutant, which sensitizes to gamma rays, does not change this mutant’s UV resistance.
How does UV light kill S marcescens?
UV light is used as a control condition to show that the experiment works. UV radiation causes mutations in the bacterial DNA and the colonies should turn white. (UV light will also kill some of the colonies).
What is the effect of longer UV exposure on Serratia marcescens?
What is the effect of longer UV exposure on Serratia marcescens? Which plates should be compared? Long UV exposure reduces/eliminates growth of the Serratia marcescenes. Plates with a mask and no lid exposed to UV for 3 seconds should be compared to plates that were exposed to 30 seconds.
Is there anything unique about Serratia marcescens?
Serratia marcescens has a unique ability to produce extracellular enzymes (28). Several such enzymes have been shown to have the ability to degrade chitin, a substance which mainly comprises fungal cell walls (28).
Why is Serratia marcescens red?
Serratia marcescens is a gram-negative, facultatively-anaerobic bacterium and opportunistic pathogen which produces the red pigment prodigiosin. Pigmented cells were found to accumulate ATP more rapidly and to multiply more quickly than non-pigmented cells during the high density growth phase.
Does Serratia have a capsule?
Motility: Usually motile by peritrichous flagella. Capsules: None.
How do you grow Serratia?
Serratia, like other Enterobacteriaceae, grow well on ordinary media under anaerobic and aerobic conditions. They grow well on synthetic media using various compounds as a single carbon source. Optimum growth of all strains of Serratia has been observed at pH 9 and at temperatures from 20–37°C.
How do you get Serratia?
Multiple-Resistant Serratia marcescens Transmission is by direct contact. Droplets of S. marcescens have been found growing on catheters, and in supposedly sterile solutions. Contaminated intravenous pain control fluids were the course of an outbreak of S.
Where Serratia marcescens is found?
Most of us have seen Serratia marcescens in our daily environment when colonies of the bacteria appear in the toilet bowl, shower stall, bathtub, or the pet’s water dish as a pink film. In addition to appearing on water surfaces, it is also found in dust in the feces of animals and humans.
Why is Serratia red?
What does Serratia marcescens ferment?
Serratia marcescens was able to metabolize mannitol to produce acid, but gas was not produced. Glucose – Positive for the fermentation of glucose to produce acid, but negative for the production of gas.
Is Serratia found in water?
Serratia bacteria are common inhabitants of our environment and can be found in many places, including human and animal feces, dust, soil, and in surface waters. The bacteria will grow in any moist location where phosphorous containing materials or fatty substances accumulate.