Answer:
Cell survival curve is used to describe the relationship between the surviving fraction of cells of radiation and the absorbed dose. The surviving fraction is usually represented in a logarithmic scale in the cell survival curves.The shape of cell survival curves also depends on the type of radiation used.
Explanation:
hope its helpful for you
Answer:
Okay
Explanation:
Human topoisomerase I plays an important role in removing positive DNA supercoils that accumulate ahead of replication forks. It also is the target for camptothecin-based anticancer drugs that act by increasing levels of topoisomerase I-mediated DNA scission. Evidence suggests that cleavage events most likely to generate permanent genomic damage are those that occur ahead of DNA tracking systems. Therefore, it is important to characterize the ability of topoisomerase I to cleave positively supercoiled DNA. Results confirm that the human enzyme maintains higher levels of cleavage with positively as opposed to negatively supercoiled substrates in the absence or presence of anticancer drugs. Enhanced drug efficacy on positively supercoiled DNA is due primarily to an increase in baseline levels of cleavage. Sites of topoisomerase I-mediated DNA cleavage do not appear to be affected by supercoil geometry. However, rates of ligation are slower with positively supercoiled substrates. Finally, intercalators enhance topoisomerase I-mediated cleavage of negatively supercoiled substrates but not positively supercoiled or linear DNA. We suggest that these compounds act by altering the perceived topological state of the double helix, making underwound DNA appear to be overwound to the enzyme, and propose that these compounds be referred to as ‘topological poisons of topoisomerase I’
You need to stop cheating on your collage classes because you really need to know this stuff when you have to save someone’s life. the answer is a
Answer:
The correct option is : a. causing threshold to be reached more quickly
Explanation:
Norepinephrine, also known as noradrenalin, is an organic compound, which belongs to the catecholamine family. It acts as a hormone and a neurotransmitter in the brain and the body and also impacts the heart.
It is one of the hormones secreted by the adrenal medulla. Norepinephrine is a part of the fight-or-flight mechanism of the body. It acts by binding to the β-1 receptors and opens the chemical or ligand gated calcium and sodium ion channels. Therefore, <u>it causes the threshold to be reached faster </u>by increasing the rate of depolarization and thus causes heart arrhythmia.
Therefore, <u>Norepinephrine acts on the heart by </u><u>causing threshold to be reached faster.</u>
Answer:
The correct answer would be - giving oral antihistamines or stop taking penicillin.
Explanation:
As there is no shortness of breathing, breath sound is clear which means there is no obstruction. Blood pressure of the patient is also almost normal and there is no sign of less body oxygen as the oxygen saturation is 96%.
She only experiencing rashes and itching that is start after taking penicillin which is mot likely due to allergy to the penicillin which takes place in 1 out of 15 people that take ampicillin or penicillin. This type of allergy can be treated by the antihistamines such as cetirizine or by stop taking the medication causing it.
