How do radioresistant extremophiles survive?
Some radioresistant extremophiles have developed a way to survive high levels of radiation. As it would in a normal cell, the radiation does actually break the microbe’s DNA into pieces and mess it up. This process is how Deinococcus radiodurans, the second most radioresistant organism known, survives.
What habitat does radioresistant live in?
Another extremophile genus, Deinococcus, is extremely radioresistant and has been found in deserts, oceans, lakes and marine fish.
Which of the following is an example of radioresistant organism’s )?
Deinococcus radiodurans is an extremophilic bacterium and one of the most radiation-resistant organisms known.
Where are radiation-resistant extremophiles found?
The microorganisms that thrive under extreme radiation are referred to as radiation-resistant or radioresistant extremophiles. They have been found in wide environmental niches such as higher elevations (mountain ranges) and open fields where UVR levels are high.
What is a radioresistant tumor?
Tumor Radioresistance Clinically, a tumor is considered radioresistant when irradiation is unable to reduce its volume or when a recurrence occurs after a possible regression. However, tumors with histological characteristics identical to a radioresistant tumor can be highly responsive to radiotherapy treatment.
What tissues are radioresistant?
The radioresistant tissues, heart, liver, lung and kidney, contain 2 to 15 times more protein per cell, nucleus and chromatin compared with the radiosensitive tissues, spleen and thymus.
What are radioresistant cells?
Radioresistance is a process in which the tumor cells or tissues adapt to the radiotherapy-induced changes and develop resistance to the IR. This is a complex process involving multiple genes, factors, and mechanisms [34, 35].
Which is radioresistant?
Medical Definition of radioresistant : resistant to the effects of radiant energy radioresistant cancer cells — compare radiosensitive.
How do you find the radiation resistance of an antenna?
The radiation resistance is determined by the geometry of the antenna and the operating frequency. The total feedpoint resistance at the antenna’s terminals is equal to the radiation resistance plus the loss resistance due to ohmic losses in the antenna.
Why some Tumours are radioresistant?
There is now good evidence that the radiosensitivity of human tumour cells varies form one tumour type to another, and that the steepness of the initial part of the cell survival curve correlates with clinical radioresponsiveness. Studies at low dose rate allow differences between tumour cells to be seen more clearly.