Questions tagged [radiation]

Ionizing electromagnetic waves, usually harmful to most biological beings.

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Why isolated chlorophyl emits red light?

If we observe isolated chlorophyl solution with UV light, chlorophyl is seen as red. explanation suggests that when specific atom of chlorophyl absorbs UV light, atom gets excited and in a short time ...
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Why does UV radiation from the Sun cause skin cancer?

What is the specific mechanism makes non-ionizing UVA and UVB radiation carcinogenic? Can lower energy light, like visible light, be carcinogenic because of this mechanism, or is there some kind of ...
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What is the relationship between radiation and evolution?

There is always a certain amount of background radiation present, for example due to ionizing radiation from the sun and other stars. Also certain materials like granite may emit relatively large ...
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What are the effect of radioactivity on grey wolves in Chernobyl?

I am doing some research about the effects that radioactivity has and is having on grey wolves in Chernobyl and more particularly on their genetics, but maybe also looking at the populations in the ...
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A study has found that cell phones cause infertility, is this something to worry about or is the study flawed?

Is this a worrying study, or is it flawed? A study has found that cell phones are detrimental to male sperm quality (Lower sperm motility and sperm concentration). It’s original goal was to determine ...
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Can high energy photoelectrons damage cell membranes?

I've read that in addition to ionizing radiation causing damage to DNA through direct absorption, but DNA can also be damaged through photoelectrons with enough energy. The thing I was wondering is ...
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Selective breeding of organisms to survive on Mars [duplicate]

It seems that there may have been life on Mars, and it's also tempting to terraform and colonize the planet. This question is about testing the hypothesis "Can primitive life survive on Mars?&...
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Why does ionizing radiation cause only DNA double strand breaks?

It's known that ionizing radiation such as X-ray and $\gamma$-ray, cause DNA damage, specifically double strand break. Why is it so? I mean, why not single strand break, why not pyrimidine dimer?
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What is the modern state of the theory of evolution?

When I studied biology at my medical school, we used to learn topics around a century old: the famous Darwin's voyage on "Beagle" to the Galapagos Islands, the classical triad of his Theory ...
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Is there a negative correlation between the mRNA produced by the cell and the time of extraction? [closed]

I am doing some data analysis about gene expression time series. When I plot mRNA produced by P. Furiosus cells irradiated by gamma radiation against the time of extraction, it seems that there is a ...
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Why does our visible range not include infrared or UV radiation? [duplicate]

As the radiation peak of the sun is in the UV region and since at around room temperature materials emit radiation at IR, I wonder why our eyes are not capable of using these wavelengths. I guess ...
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Radiation mutation breeding in plant seeds: practical aspects

I did read some seed irradiation papers and they all use Gy as unit of measure, however I have never seen seed weights reported. How did they calculate that, since Gy is J/kg? Differencies aside ...
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Does melanin protect humans from gamma radiation?

It is known that radiotrophic fungi use melanin to make use of gamma radiation. It is also known that melanin protects human skin from UV radiation. Thus I wonder whether melanin protects humans from ...
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Does the body use radio frequencies in the range of frequencies used in mobile phone networks?

I read something related to the biological effects of "mobile phone radiation". It was not as far from reality as one might expect with this topic. The context was about the acceptable distance of ...
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What are the methods of prophylaxis against exposure to radioactive isotopes?

Potassium iodide is used as prophylaxis to prevent illness when one is likely to be exposed to Iodine-131 and other radioactive isotopes of iodine. Are there any other prophylactic treatments for ...
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Can any organisms see non-electromagnetic radiation?

Some examples would be cosmic rays, neutron radiation, alpha radiation, beta radiation, muon radiation, and antimatter radiation. Some related questions: How is non-electromagnetic radiation detected,...
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Is UV radiation more likely to cause mutations during mitosis?

According to Life: The Science of Biology (10th edition), UV radiation might cause the formation of pyrimidine dimers, which are the primary cause of skin cancer in humans. Are mutations more likely ...
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Is it better to receive a certain dose of radition gradually or all at once?

Suppose you had to choose between getting exposed to 1000 mSv gradually over the next 5 years, or all at once exactly 5 years from now. Which one would be the healthiest option? Is the probability of ...
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Does a microwave oven disinfect food?

Imagine I am preparing food -- just about to put it into a microwave oven -- and some of it falls on the floor. Assuming it got some bacteria or other organisms (viruses?) on it, will the microwave ...
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Why did they expect Astronaut Scott Kelley's telomere shortening to accelerate? (they got longer!)

The NPR News article and podcast Scientists Share Results From NASA's Twins Study says: SCOTT KELLY (NASA Astronaut): You know, the symptomatic stuff is fine. I don't have any long-term negative ...
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Could a strong magnet field repel the body before damaging it?

Could a magnetic field be strong enough to damage the body or erase the brain? Blood is slightly diamagnetic, so if the field was strong enough, could it repel a body evenly? Could a diamagnetic ...
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A cure for radiation exposure?

Some of the greatest inventions of my lifetime have been from looking at nature and copying. I found out tadigrades in outer space have the ability to repair their own DNA when exposed to radiation ...
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Can bacteria, viruses, and cancer cells be destroyed by resonance?

Radiotherapy has been used to treat cancer. Can the resonances by coordinated electromagnetic waves (and/or other forms of waves), of various frequencies, amplitudes and pulse rates, directed from ...
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217 views

What caused the Mesozoic-Cenozoic radiation?

The Phanerozoic eon has had 5 major extinction events and 3 major radiation events. After the Cambrian and Ordovician radiations came all five of the major extinction events, the last of which (...
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Effects of X-ray exposure on upcoming pregnancies

Recently we had a little fight with my girlfriend about the risks of genetic diseases for our potential baby. The thing is that she had her medical check recently and it included an X-ray examination ...
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What gives researchers a reason to test the Radiation Resistance of organisms?

I was reading about the Thermococcus Gammatolerans and its absurdly high radiation resistance, when something occurred to me. What reason did anyone have in the first place to subject this thing to ...
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Any benefit to low dose radiation?

Is there any survival benefit in humans that can be obtained from chronic exposure to low dose radiation, or is any dose of radiation a potential harm? Has any research been done into this?
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What are the biological processes of ingesting radioactive particles?

As someone who has basic understanding/education in physics and how radiation works, there is something that is confusing me and which I would like to shed some light on (I posted about this ...
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Are microwaves harmful to us?

They closed my question on the Physics Stack Exchange because it wasn't a purely physics question, so I'm trying here. Recently I've come across the topic of scrapping microwaves, and the various ...
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Is there a taxon that "adaptively" radiates faster?

It seems that there are some taxa that have a greater potential to radiate through adaptations. Off my head, I can think of birds: Darwin's finches Hawaiian honeycreepers House finches (Carpodacus ...
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How do I find samples/patients in TCGA (the cancer genome atlas) that had radiation therapy?

I want to correlate the expression of a gene (for sample the KRAS gene) with survival and if the patient received radiation therapy using any suitable TCGA (the cancer genome atlas) dataset. However, ...
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Why does UVA penetrate deeper than UVB, though it's weaker?

Even though UVA radiation ranges in longer wavelengths (315–400 nm) than UVB (280–315 nm) and thus is less energetic, UVA is able to penetrate deeper into the skin and even reach the dermis. Why is ...
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Why are fertilizers with polonium 210 used when growing tobacco?

Why are fertilizers with polonium 210 used when growing tobacco? I'm thinking of pursuing a science fair in which I create my own fertilizer for tobacco that doesn't contain polonium or lead. However,...
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How come our thyroid glands don't suffer awful mutations (or do they)?

I was listening to a lecture by my Biology professor and he said that the thyroid gland contains radioactive Iodine which can break down and create reactive Oxygen species (because ionizing radiation ...
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Could there be any effects from low powered infrared being used to track eye movements long term?

Basically, looking into infrared LED's and a camera with an infrared bandpass filter for tracking eye movements; my concerns are whether there would be any potential negative long term effects from ...
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Is far Infrared heaters in the market truly producing healthy far Infrared and is it practical to install them at home? [closed]

I read few blogs and websites about far infrared heaters and all are very possible about this new technology. I bought one of the heaters as a test and find quite impressive also. However, I am ...
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Can DNA be considered as a fractal antenna?

I was reading about the consequences of using mobile phones and came across the statement that mobile phones are a potential source of cancers because DNA is a kind of a fractal antenna. The reason ...
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Does cell phone radiation promote longevity?

This preprint presents results from a 2-year National Toxicology Program study on the effects of cell-phone radiation in rats. On page 8 of the PDF, survival results are presented. The presentation of ...
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Which frequency of UV light damages DNA?

I have read that UV light can damage pure DNA (DNA that has been extracted and purified). Is there a particular frequency threshold where this damage occurs or is it more of a gradient where the high ...
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Is Near-infrared focused light safe for your eyes?

I found a new product, but I'm afraid it's not safe. Can you help me understand what the safety limits are when it comes to near-infrared light focused on your eyes is? I'm assuming the wavelength ...
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Why do cockroaches and flying beetles survive high levels of radiation? [closed]

Apparently it's a fact that cockroaches survive nuclear radiations. How can they survive this?
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Why bananas accumulate a radioactive isotope of potassium (K40)?

A quick google search reveals many pages that intend to calm consumers down and assure them that quantities of radioactive potassium in bananas (K40 isotope) is not sufficient to be concerned about, e....
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What is the closest possible analogue to human cells? [closed]

For an experiment, I need a specific number of cells. I will grow these cells in an incubator, and then measure the number of cells which have decayed due to the induced radiation. I am using a ...
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Question about radiation and how it affects biological systems

I'm doing research on the effects of radiation, and specifically UV, X-Ray and Gamma radiation, on biological systems at the cellular level and beyond. I understand that radiation types can be ...
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Irradiation positive effect on humans?

In research paper Euphytica 135: 187–204, 2004 it is written that: 434 mutant varieties of rice have been released with improved characters such as semi-dwarf height, early maturity, improved ...
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Cesium-137 From Fukushima Meltdown

I've been reading up on the Fukushima nuclear meltdown and its effects it had on the environment. The iodine-131 initially released from the incident decayed after 8 days, but other isotopes such as ...
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How do electrons destroy DNA bonds in radiation?

Malignant tumors can be treated by radiation therapy. Most commonly it's radiotherapy with photons, or protons and so on. The common denominator for both types is that the radiation creates electrons ...
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Can radiation therapy cause cancer?

Radiation therapy is a very popular cancer treatment method. But can it have any risk for make a different cancer? Because i think that radiation exposure can make DNA mutation and thus increase the ...
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Absorbed dose from a CT scan with relation to radiation accidents

I read somewhere that the average CTDIvol in CT scans at hospitals is ~40 mGy. This translates to the 'radiation intensity' at the center of the person, and can also be roughly interpreted as an '...
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Why are women more susceptible to radiation?

The answer to this question on the Space.SE indicates women are more susceptible to radiation in space than men. Why is this the case? Is it merely that women have less muscle mass (which being more ...