When the UV-light comes in contact with skin, it can cause painful sunburns in the short term and lead to life-threatening skin cancer in older age. Sunburns and skin cancer can, however, be prevented by following a few simple rules(1). The sun, as it shines down upon us, gives us vitamin D which is needed for normal bone formation. In those warm rays, however, there is also radioactive ultraviolet light (UV-B and UV-A to be specific) that
Abstract: This essay talks about the radiation from sunshine and the effects that it bring to the human body. Admittedly, the sunshine the body some benefits, such as boosting the body’s supply of vitamin D and enhancing the mood. However, while people are receiving profits, they are also be influenced by some drawbacks. The long time exposure to sunlight brings people quite harmful effects and even destroy people’s skin. The UV radiation can be classified as UVA, UVB and UVC.
Sunlight has UV photons that we humans can’t see but can damage our skin. There are UVB rays and UVA rays, UVB rays are short wavelengths and don’t get deep into our skin so they are the main cause of sunburn + skin cancer but UVA rays have a longer wavelength and go deep into the skin and are the cause of early aging. (1) The Sun can Harm us because the sun emits dangerous UV rays, luckily the ozone layer absorbs most of these UV rays but the ones that do get to the surface can be dangerous to our skin and can cause Sunburn and ,in worse cases , Skin cancer. SunBurn is reddening,swelling of the skin and can cause blistering and peeling of the skin, when you spend a long time outside on a sunny day and you are exposed to UV rays our
• Ozone is a powerful oxidizing agent and has its industrial uses related to oxidation. However, the high oxidizing power causes severe damages to the mucous and respiratory tissues in animals, and also tissues in plants, when its concentration is above 100 ppb. • Physical properties: • Ozone is one of the most constructive gases that serves to protect all the earth living organisms (plants, animals and humans) from the damaging effects of the ultraviolet radiation of the sun light. It succeeded to do that by the ability of absorbing the radiation in the UV region of the electromagnetic radiation with the wave length (220-290 nm), thus it prevents the harmful UV radiation from reaching the earth. • Ozone color change with the change of the physical state , its color is blue and pale in the gaseous state , deep blue in the liquid state and violet to black in the solid state (crystals).
Some of this damage is temporary, such as sunburn. However, it will lead to furture problems if allowing people’s skin to burn, for example, the skin cancer owing to long-term skin damage. UV radiation is part of the electromagnetic spectrum that reaches the earth from the sun. It has wavelengths shorter than visible light that make it invisible to people’s naked eye. These wavelengths can be classified as UVA, UVB and UVC.
Nanoparticles as photosensitizers must be in close proximity to the tumor cells that they are usually administered at the tumor site directly. Photodynamic therapy is desirable in that it is relatively non-invasive and low toxicity. The major technical barrier, however, of this therapy is its difficulty in systemic introduction of photosensitizer to the tumor site and local irradiation to activate them. Tumors that have disseminated throughout the whole body may not be adequate for this therapy since the current technology is not available to irradiate the whole body. In addition, UV light is the wavelength of choice for the most of traditional photosensitizers that cannot efficiently penetrate into deep
Today there is concern that our ozone layer is depleting due to the release of chlorofluorocarbons (CFCs) Into our atmosphere. This means harmful rays from the sun can harm the Earth. After the whole of the ozone layer is created, it is harder for the gasses to leave because they are absorbed into the earth. These harmful gases and UV rays cause an increase in cancer blindness and cataracts and, alarmingly, some experts now believe that the amount, for humans and animal(Thiessen, National geographic par 3)(Hunt, Depletion, par2). That is called the “Greenhouse Effect.” Why do we need the ozone layer?
The integrity of a genome is monitored by several mechanisms including DNA damage checkpoints, DNA repair machinery, and mitotic checkpoints within the cell. If there are defects in any one of these mechanisms the result is genomic instability. A few other things that can alter the regulation of the cell cycle are posttranslational modifications of histone tails, chromatin structure, and DNA methylation. This topic continues to be a debate about what exactly the driving force of the initiation of tumors is and what causes it to progress. Genomic stability is essential for cellular integrity.
Ultraviolet light (UV) is one of the energy from coming from the sun. The UV light is not visible to the eye. Small amount of UV light is beneficial for humans. We need UV light to produce vitamin D. But extended amount of exposure may cause some health problems. Only a small layer of ozone is standing between the harmful UV rays and us.
In These photoelectric panels could also cut down on the loss of energy due to the reflection and refraction of a laser ignition source (Azizi, et al 1) as they would absorb the light given off (Hora, et al 3). The highest power energy released from the reaction are done so in the form of x-rays. These x-rays are no more potent than that of an airport security