sphaeroides, and E. coli was the most sensitive bacterium tested.
Similarly, why are some bacteria more resistant to UV light than others?
The longer the exposure time, the more microbes are killed. Spores are more resistant to UV light than other cells. Bacteria may possess enzyme systems, which locate and repair damaged DNA. UV light can increase the risk of skin cancer, so it should not be used to kill microbes on skin.
Additionally, can E coli survive UV light?
The Effects of Ultraviolet Light on Escherichia coli. Ultraviolet (UV) radiation is known to inhibit cell growth and induce gene damage (1). coli were exposed to UV light with a wavelength of 254 nm. The number of CFUs under control and UV-exposed conditions were measured after 24 and 48 hours.
Why doesn't UV light kill all of the bacterial cells?
In simple terms, when bacteria or another type of microbe is directly exposed to certain types of UV light, the DNA (its fundamental building block) of the cell is damaged, preventing it from replicating. If a cell cannot reproduce, then the cell cannot cause infection, which is how UV light kills bacteria.
How does UV light affect E coli?
The Effects of Ultraviolet Light on Escherichia coli. Ultraviolet (UV) radiation is known to inhibit cell growth and induce gene damage (1). For these reasons, UV radiation is used as a method to sterilize surgical instruments because it kills the bacteria present and disrupts bacterial reproduction (2).