A Natural Skin Cancer Cure
How To Prevent Skin Cancer
Complete Guide to Preventing Skin Cancer. We all know enough to fear the name, just as we do the words tumor and malignant. But apart from that, most of us know very little at all about cancer, especially skin cancer in itself. If I were to ask you to tell me about skin cancer right now, what would you say? Apart from the fact that its a cancer on the skin, that is.
Before we concentrate on the chemical aspects of pollution, it is worth remembering that this is not the only form of pollution. Noise is an example of physical pollution. Simply adding water to a river at a different temperature to the ambient can effect life in the river. This is a form of thermal pollution. Pollution is, however, often associated with the introduction of chemical compounds into the environment. Popular opinion usually sees these as unnatural (and therefore harmful) substances. Perhaps one of the best known recent examples was the concern over the emission of chlorofluorocarbons (CFCs). These have been used in aerosol sprays and other applications. They are linked with the depletion of ozone in the stratosphere, which could lead to an increase in the intensity of harmful ultraviolet radiation from the sun reaching the earth's surface and increasing the incidence of skin cancer. Although the production of CFCs themselves is now banned in developed countries, the...
It was within the epicenters of gay life - San Francisco, New York, and Los Angeles - that omens of an epidemic were first recognized. In 1980 and 1981, physicians in these cities began diagnosing rare conditions, Pneumocystis cari-nii pneumonia and Kaposi's Sarcoma (a skin cancer), in young homosexual men. The fact that these diseases were very rare, were being seen in an unexpected context, and were clustering in homosexual men hinted at the possibility of an emerging epidemic. The first published reports of the sudden outbreak of these conditions came from clinicians in these three cities who simultaneously noted that what they were observing might be related to a homosexual lifestyle (CDC, 1981a, 1981b). That several of the individuals represented in these reports had already died underscored the seriousness of this fledgling epidemic. Other unusual opportunistic infections were also showing up in gay men, prompting conjecture that a common underlying immune suppressing disease
Ultraviolet light from the sun is a form of ionizing radiation that can cause skin cancer, or melanoma. The basal cells and melanocytes are vulnerable to UV. It is feared that the destruction of stratospheric ozone by substances such as chlorofluorocarbons will result in increased UV radiation at the ground level, leading to increased melanoma. Such an increase has already been observed in Australia, which has also experienced declines in stratospheric ozone.
As well as worries about the addition of CO2 to the atmosphere, scientists are also concerned about the depletion of another gas, ozone. Ozone in the stratosphere absorbs much of the ultraviolet (UV) radiation from the sun. This is important because ultraviolet-B (UV-B) is harmful to most life forms. It is the UV-B rays from the sun that cause sunburn and skin cancer in humans and UV light is used to kill bacteria in sewage treatment plants.
Several potential deleterious effects result from decreasing the stratospheric ozone concentration. Of major concern is increased skin cancer in humans resulting from greater UV radiation reaching the earth's surface. Additional potential concerns include the effects on some marine or aquatic organisms, damage to some crops, and alterations in the climate (Francis 1994). While environmental engineers are uncertain about all seasonal and geographic characteristics of the natural ozone layer and quantifying these effects, the effects are recognized via precursor pollutant control measures included in the 1990 CAAAs.
In the stratosphere, twelve to sixteen km above the surface, ultraviolet light from the sun converts the oxygen molecule to ozone. Here, the conversion process creates an ozone layer that absorbs ultraviolet radiation, protecting the earth from most of its damaging rays. Ultraviolet radiation causes skin cancer, and it is associated with cataracts in eyes, gene mutations, and immune system damage. Ozone also inhibits photosynthesis in plants.
Some humans have an inherited autosomal recessive condition called xeroderma pigmentosum. These persons are exceedingly sensitive to getting skin cancer from exposure to sunlight. The condition can be diagnosed in infancy, enabling people to lead fairly normal lives by protecting themselves from exposure to the sun. The condition seems to be related to a number of different mutations, including about seven that affect excision repair, and to reduced activity of the enzyme that uses blue light to repair thymidine dimers.
UV Radiation Overexposure to the Sun's radiation can cause health problems such as cataracts, which cloud the lens of the eye, and skin cancer. In your Science Journal, describe ways to limit your exposure to the Sun's damaging radiation. Ozone Depletion The atmosphere includes the ozone layer ozone gas that is about 15 km to 30 km above Earth's surface. It protects life on Earth by preventing damaging amounts of the Sun's ultraviolet (UV) radiation from reaching Earth's surface. Scientists have discovered that the ozone layer is gradually becoming thinner. The thinning of the ozone layer is called ozone depletion. This depletion allows increased amounts of UV radiation that can harm living organisms to reach Earth's surface. For humans, it could mean more cases of skin cancer. Ozone depletion occurs over much of Earth. Data collected in the late 1990s indicate that ozone levels over the United States, for example, had decreased by five to ten percent since the 1970s.
Ozone in the stratosphere is often called 'good' ozone because it protects life on Earth from harmful levels of UV radiation from the Sun. Therefore, a decrease in the amount of ozone would allow an increase in the amount of the UV radiation from the Sun to reach the Earth's surface. Corresponding to an increase in UV are projected significant impacts on ecosystems and human health, including increases in incidences of skin cancer, eye cataracts, damage to genetic DNA, and suppression of the efficiency of the immune system. It is the concerns about increased biologically harmful levels of UV from the decreasing levels of ozone that has largely been the driver for policy actions to protect the ozone layer.
It has also been linked to an increased incidence of cataracts and skin cancer in humans and wildlife. Some plants, such as loblolly pine, are sensitive to UV radiation a drop of approximately 1 percent in the total yield for some food crops, including corn, rice, wheat, and soybeans, has been associated with each 3 percent drop in stratospheric ozone (ibid.).