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In recent years, scientists have discovered that the iridescence of various colorful creatures, from beetles to birds to butterflies, is often due to microscopic structures known as photonic crystals. Unlike pigments, which absorb or reflect certain frequencies of light as a result of their chemical composition, the way that photonic crystals reflect light is a function of their physical structure. That is, a material containing a periodic array of holes or bumps of a certain size may reflect blue
Glucosamine supplements reduce knee pain in people with cartilage damage and possibly the degenerative joint disease osteoarthritis, concludes research in the British Journal of Sports Medicine.
Glucosamine is produced naturally in the body and found primarily in joint cartilage, damage to which often precedes osteoarthritis. Glucosamine capsules are widely available from health food shops, supermarkets, and over the internet
The researchers conducted a small trial in which 24 patie
Since the end of the 1960s West Africa has continuously been suffering hard drought. The rainfall deficit for the 1970s and 1980s, calculated to compare with the 1950s and 1960s, thus reached as high as 50% over the northern part of the Sahel. The hydrological cycle as a whole is affected by this drought, which results in serious consequences for agriculture and food security.
IRD researchers, aiming to understand the mechanisms behind this situation, examined rainfall data from 1950 to 1990
Using the same technology that creates tiny, precisely organized computer chips, a Johns Hopkins research team has developed beds of thousands of independently moveable silicone “microneedles” to reveal the force exerted by smooth muscle cells.
Each needle tip in the gadget, whose development and testing is reported this week in the advance online edition of the Proceedings of the National Academy of Sciences, can be painted with proteins cells tend to grab onto. By measuring how far a contr
Like a well-trained soldier with honed survival skills, the common bacterium, Group A Streptococcus (GAS), sometimes can endure battle with our inborn (innate) immune system and cause widespread disease. By investigating the ability of combat-ready white blood cells (WBCs) to ingest and kill GAS, researchers have discovered new insights into how this disease-causing bacteria can evade destruction by the immune system. The research is being published this week in the Online Early Edition of the Procee
Research by Oxford University and collaborators has shed new light on the last 100,000 years of human migration from Africa into Asia. The new genetic study confirms that some of the earliest migrants travelled into Asia by a southern route, possibly along the coasts of what are now Pakistan and India. The researchers identified a genetic marker in museum samples of inaccessible populations from the Andaman Islands in the Bay of Bengal. This allowed them to re-interpret previous genetic studies from