Navigation Links
Dark skin protects

An Australian researcher suggests dark skin could be better than white at fending off fungi and bacteria. A paper by Sydney-based biologist James Mackintosh says it could explain why dark skin evolved in humans and animals living in tropical environments.

A popular theory on why darker skin prevailed in some areas and lighter skin in others, is that// the extra melanin in darker skin protects against cancer and sunburn from ultraviolet radiation. But, New Scientist reports, some parts of the body which are hardly ever exposed to sunlight, such as genitalia, throats and nasal passages, are packed with melanin cells.In mammals, melanin is contained inside vesicles called melanosomes. Larger, more numerous melanosomes make for darker skin. Mackintosh suggests melanosomes might act like lysosomes in the immune system, which engulf invading microorganisms and use enzymes to kill them.

"Melanin is a sticky molecule. The bacteria and fungi get tangled up, and it stops them from proliferating." Also, a protein called attractin is known to regulate both melanisation and immunity in humans, suggesting a link between the two.He also points out that darker-skinned people are less likely than people with fair skin to develop serious skin diseases.

It also explains why all do not have black skin. Melanin is made from the amino acid tyrosine, which is also needed to build proteins. In prehistoric days when food was scarce in cold, dry areas, tyrosine was probably conserved to make essential proteins, Mackintosh says. It was only worthwhile converting it into extra melanin in the warm, damp tropics where food was abundant and pathogens were rampant.


'"/>




Page: 1

Related medicine news :

1. Beer vitamin protects heart
2. B Vitamin protects and lowers toxicity of Arthritis Drug
3. Progestin protects against ovarian cancer
4. Moderate alcohol consumption protects against dementia
5. Avacado protects from liver damage
6. Ingredient in turmeric protects skin
7. Clean air protects lives
8. Key enzyme protects against Alzheimers
9. Aromatase Inhibitors drug Femara after Tamoxifen therapy protects from breast cancer recurrence
10. Olive oil protects the heart
11. Garlic inhibits fungal growth and protects food
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Dark skin protects

(Date:8/22/2014)... to open blockages in the kidney arteries may ... modern clinical trials, according to new recommendations for ... Cardiovascular Interventions today by the Society for ... Case Medical Center,s Sahil Parikh, MD, Director, Interventional ... Western Reserve University School of Medicine was the ...
(Date:8/22/2014)... 2014 Menstrual leaks risk stains and ... Fla., decided that there needed to be a better ... and producible in design variations, the Safety Net optimizes ... which avoids embarrassment and promotes peace of mind. The ... , The original design was submitted to the Fort ...
(Date:8/22/2014)... FRIDAY, Aug. 22, 2014 (HealthDay News) -- People who ... for the lower levels of nicotine, according to a ... toxic chemicals than other smokers, the researchers say. ... to 65, who smoked regular cigarettes with nicotine emission ... The participants then switched to reduced-nicotine cigarettes for the ...
(Date:8/22/2014)... News) -- Many children get anxious or afraid when ... a number of ways that parents can make these ... The first step is to explain to children in ... health, said Rita John, director of the pediatric primary ... Nursing in New York City. "Children need to ...
(Date:8/22/2014)... FRIDAY, Aug. 22, 2014 (HealthDay News) -- College can be ... number of things they can do to make the most ... "a time to adjust, explore, meet new people and learn ... director of student wellness and assessment at St. John,s University ... "Not all learning takes place in the classroom. College ...
Breaking Medicine News(10 mins):Health News:UH Case Medical Center's Dr. Parikh authors SCAI paper on renal artery stenosis treatment 2Health News:UH Case Medical Center's Dr. Parikh authors SCAI paper on renal artery stenosis treatment 3Health News:Low-Nicotine Cigarettes May Not Lead to More Smoking 2Health News:Simple Steps Make Shots Less Scary for Kids, Nurse Says 2Health News:College Prep 101 2
... -- Eating a diet high in trans fatty acids, an ... meals and snacks, might be associated with negative -- and ... the study, researchers from the University of California, San Diego ... men and women. They also considered other possible contributing factors, ...
... Patients with early stage malignant pleural mesothelioma (MPM), ... lungs, may be eligible for aggressive multi-modality therapy involving ... and controversy has existed about which approach is superior. ... surgery where surgeons remove the entire diseased lung, lung ...
... pounding to the beat in group exercise class has become the ... of changing in the locker room, the acts of disrobing, dressing, ... discomfiting. It,s a complex experience as women are faced with an ... "I walk into the change room and pace anxiously up and ...
... with lower risk of heart disease, but data for ... total of 83,578 female participants of the Nurses, Health ... cancer at baseline were followed-up from 1980 to 2006. ... and updated approximately every 4 years, whereas stroke and ...
... is a clear relationship between androgenetic alopecia (common premature ... of the prostate that appears in aging men and ... appears in 50% of men over 60 year old ... the light of the study published in the ...
... study published today in the Journal of Clinical ... children and adolescents with acute lymphoblastic leukemia (ALL), the ... those diagnosed during the years 1990-1994, to 90.4 percent ... improved survival is due to using existing drugs better, ...
Cached Medicine News:Health News:Could Trans Fats Make You Cranky? 2Health News:Pleurectomy/decortication proposed preferred surgical procedure 2Health News:The stress of undress 2Health News:The stress of undress 3Health News:Moderate drinking associated with lower risk of stroke in women 2Health News:A study confirms the correlation between premature alopecia and prostate conditions 2Health News:Largest ever study of childhood ALL shows improving survival 2
(Date:8/22/2014)... , August 22, 2014 ... Hospital TVs Today Lincor announced general availability ... Engagement solution that delivers a range of education, entertainment ...      (Logo: http://photos.prnewswire.com/prnh/20140822/702945) , ... defining point of care patient engagement to bedside smart ...
(Date:8/22/2014)... -- WaferGen Bio-systems, Inc. (NASDAQ: WGBS) today announced the pricing ... stock and warrants at a price of $10,000 per ... deducting underwriting discounts and commissions and offering expenses payable ... separable and will be issued separately.  The shares of ... NASDAQ Stock Market under the ticker symbol "WGBS" on ...
(Date:8/21/2014)... , Aug. 21, 2014 Nektar ... International Inc. today announced positive results from its ... an investigational, extended half-life recombinant factor VIII (rFVIII) ... Factor (Recombinant)], which met its primary endpoint in ... arm compared to the on-demand arm. ...
Breaking Medicine Technology:Lincor Unveils Next Generation TV-based Patient Engagement Solution 2WaferGen Bio-Systems Announces Pricing of $20 Million Underwritten Offering and Uplisting to NASDAQ 2WaferGen Bio-Systems Announces Pricing of $20 Million Underwritten Offering and Uplisting to NASDAQ 3WaferGen Bio-Systems Announces Pricing of $20 Million Underwritten Offering and Uplisting to NASDAQ 4Baxter Announces Positive Top-Line Results from Its Phase 3 Study of BAX 855, Extended Half-Life Recombinant FVIII for Hemophilia A Patients 2Baxter Announces Positive Top-Line Results from Its Phase 3 Study of BAX 855, Extended Half-Life Recombinant FVIII for Hemophilia A Patients 3Baxter Announces Positive Top-Line Results from Its Phase 3 Study of BAX 855, Extended Half-Life Recombinant FVIII for Hemophilia A Patients 4Baxter Announces Positive Top-Line Results from Its Phase 3 Study of BAX 855, Extended Half-Life Recombinant FVIII for Hemophilia A Patients 5
... New Jersey, May 31, 2012 The Dueling Pianos ... th . The event is slated 6.30 pm onwards and promises ... Pianos, based out of the Philly area since March of 1990, ... the east coast, from Boston to North Carolina, out to Anaheim, ...
...  Just days after the Senate overwhelming approved legislation to better ... followed suit, passing the Food and Drug Administration Reform ... The Bulk Pharmaceuticals Task Force (BPTF), an affiliate ... (SOCMA), welcomed the vote and urged House and Senate conferees ...
Cached Medicine Technology:SIRO Clinpharm Announces a Fabulous Date With the Dueling Pianos 2SOCMA's Bulk Pharmaceuticals Task Force Welcomes House Passage of FDA Reform Act 2
... WatchMate system is designed to protect a ... and becoming lost or injured. Such residents ... etc., or have suffered a head injury., ... on their wrist or ankle, and points ...
... Smart™ Labels have a direct thermal ... Instruments Tag-it™ HF-I transponder. When processed ... text and other graphics may be ... data is programmed to the RFID ...
... a patent pending solution using Radio ... a smart label to promote patient ... wrong-site, wrong-procedure surgery. This simple to ... orthopedic surgeon with the operating room ...
... Hospitals, correctional facilities, recreational venues ... wristbands to provide automated data capture ... reducing costly and dangerous errors. RFID ... admissions wristbands at entertainment venues as ...
Medicine Products: