Nature

Background
Increasing concern is being expressed by healthcare professionals, public health leaders and voluntary health organizations worldwide about the rapid increase in skin cancers and potential eye and immune system damage as a result of excessive ultraviolet (UV) exposure from the sun and other sources. The ozone layer shields the Earth from harmful ultraviolet (UV) radiation. Ozone...
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nfections of humans caused by parasites number in the billions and range from relatively innocuous to fatal. The diseases caused by these parasites constitute major human health problems throughout the world. (For example, approximately 30 percent of the world's population is infected with the nematode Ascaris lumbricoides.) The incidence of many parasitic diseases (e.g., schistosomiasis, malaria...

Many diseases, such as malaria and dengue fever, can be transmitted through mosquitoes. Malaria is a disease spread by mosquitoes that bite between dusk and dawn. It is a risk in many countries in the world. There is no vaccine against malaria, but medications, called anti-malarials, are available. Diseases relayed by mosquitoes such as malaria, dengue fever, yellow fever and several kinds of...

Washington area health departments are stepping up Lyme disease education and prevention efforts in response to a steep rise in the number of reported cases of the tick-borne illness in Maryland, Virginia and the District.
Deer and rodents, such as the white-footed mouse, are the most common reservoirs of Lyme disease. Adult deer ticks are red-brown in color and about 3mm in size. Larvae and...

It seems Americans have a lot to talk about. U.S. cell phone subscribers racked up more than a trillion minutes of cell phone talk time in one year alone, according to the Cellular Telecommunications and Internet Association (CTIA).
However, people don't just use cell phones to talk. Thanks to text messaging, mobile downloads and Internet access, today's phones provide a variety of services at...

Global surface temperatures have increased about 0.6°C (plus or minus 0.2°C) since the late-19th century, and about 0.4°F (0.2 to 0.3°C) over the past 25 years (the period with the most credible data). The warming has not been globally uniform. Some areas (including parts of the southeastern U.S.) have, in fact, cooled over the last century. The recent warmth has been greatest over North America...

The term "vitamin D" refers to several different forms of this vitamin. Two forms are important in humans: ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). Vitamin D2 is synthesized by plants. Vitamin D3 is synthesized by humans in the skin when it is exposed to ultraviolet-B (UVB) rays from sunlight or the diet.Vitamin D plays an important role in the maintenance of organ systems...

International travel can pose various risks to health, depending on the characteristics of both the traveller and the travel.Travellers may encounter sudden and significant changes in altitude, humidity, microbes and temperature, which can result in ill-health. In addition, serious health risks may arise in areas where accommodation is of poor quality, hygiene and sanitation are inadequate,...

The increase in relative risk for heart disease due to air pollution for an individual is small compared with the impact of the established cardiovascular risk factors such as high blood pressure or high cholesterol. However, this is a serious public health problem due to the enormous number of people affected and because exposure to air pollution occurs over an entire lifetime.The largest...

The noise problems of the past are incomparable with those plaguing modern society: the roar of aircraft, the thunder of heavily laden lorries and the thumps and whines of industry provide a noisy background to our lives. But such noise can be not only annoying but also damaging to the health, and is increasing with economic development.
Aging, some drugs, head injuries and too much noise can...

Are the twins completely identical? Are they endowed with telepathy? Do they exert an exclusive relation one on the other? All was known as on their account. Let’s light on the universe of the gemology.
In an International Population Group Reported "Nearly 70% of the" fraternal twins are qualified”, i.e. they are not certified copies and the 30% remainders are known as “identical twin”, of true...

The influence of ecological factors on the activity of drugs is very important. The drug industries pay better prices for drugs of high quality. Many species of medicinal plants grow wild in different parts of the world. The plants are scattered and it becomes difficult to collect and process them. Therefore, there is large demand for certain products and so the necessity to cultivate them or, a...

Contaminated food or water caused many epidemics in earlier times. Even today some foods frequently contain bacteria that cause diarrhea. (For example, over 50% of raw turkey or chicken contains Campylobacter or Salmonella bacteria. By contrast, only 1% of raw eggs are contaminated with Salmonella.) Ground beef may be contaminated with E. coli bacteria.
Like people, all animals carry germs. Some...

Allergies are abnormal immune system reactions to things that are typically harmless to most people. When you're allergic to something, your immune system mistakenly believes that this substance is harmful to your body. Allergic reactions are sensitivities to a specific substance, called an allergen , that is contacted through the skin, inhaled into the lungs, swallowed, or injected.
The most...

Graviola extract contains chemicals called Annonaceous acetogenins. Different research groups have established that these chemicals have antitumorous properties.1-12 Acetogenins are inhibitors of enzyme processes that are only found in the membranes of cancerous cells and this is why they destroy cancer cells but not healthy cells. Local populations have used the tree for thousands of years to...