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The Risk Factors For Sporadic Colorectal Cancer
Colorectal cancer (CRC) is one of the most common cancers in China. Although the association between the epidemiological factors and sporadic colorectal cancer has been studied, the relation between smoking, alcohol drinking, family history of cancer, body mass index (BMI) and sporadic colorectal cancer still remains uncertain. So it is important to investigate the role of these factors in the development of sporadic colorectal cancer.
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Study Rewrites Textbook On Key Genetic Phenomenon
Because females carry two copies of the X chromosome to males" one X and one Y, they harbor a potentially toxic double dose of the over 1000 genes that reside on the X chromosome.
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White House Officials Used Twitter, Ashton Kutcher To Promote HIV Testing Day
The White House sought the help of actor Ashton Kutcher to promote National HIV Testing Day on June 27, through his Twitter page, Politico reports. Kutcher has over 2.5 million followers on Twitter, where he recently posted a link to a White House blog post and video commemorating the day. Reid Cherlin, White House assistant press secretary, said, "As technology impacts how and where people are communicating online, we are constantly looking for new ways to engage with the public," adding, "Our efforts to promote National HIV Testing Day included participation from popular users of Twitter, as well as broad social media engagement by agencies across the government." The White House also used Twitter to help connect people to HIV testing sites (Gavin, 6/29).
Mental Health

Mate Selection: How Does She Know He'll Take Care Of The Kids

Throughout the animal kingdom brilliant colors or elaborate behavioral displays serve as "advertisements" for the process of attracting mates. But, what do the ads promise and is there truth in advertizing? Researchers at Yale theorize that when males must provide care for the survival of their offspring, the males" "advertisements" will always be honest - and they may devote more of their energy to caring for their offspring than to attracting females. The idea that males try to advertise their best qualities to attract females for mating isn"t a new one, nor is the idea that they might be deceptive in what they are advertising. According to Natasha Kelly, a graduate student in ecology and evolutionary biology and lead author, their new model more closely predicts the requirement for honesty in advertizing as a function of the male"s suitability for parenting. The peacock"s tail, or the primping and posturing guy in a bar are "advertisements" or mating displays that take substantial energy to maintain. When a male"s energy is heavily focused on keeping up his appearance, he may have little energy to devote to caring for offspring. But that may be ok - he may not need to tend to the kids. Previous research suggested that, under certain circumstances, males could be dishonest about their parenting skills and still have high reproductive success. This new model, appearing June 11 online before print in the Proceedings of the Royal Society B, examines the reliability of males" mating signals when they must care for offspring - an aspect that was missing in earlier studies. There are many species where males should, but do not have to, provide parental care -where females pick up the slack. These researchers focuses on those species where females can"t pick up the slack and males pay the price of not providing care. "This new work shows that when males can not escape the cost of their own failure to provide care, their advertisements will always be reliable," said principal investigator Suzanne Alonzo, assistant professor of ecology and evolutionary biology at Yale. "The qualifier in this case is where males are obligated to provide care," said Kelly. "In that case, the quiet guy in the corner might be the better choice for fatherhood." The National Science Foundation and Yale University funded this research. Citation: Proceedings of the Royal Society B, online before print June 11, 2009, doi: 10.1098/rspb.2009.0599 Yale University


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