Science Education & Policy
An international team of researchers has documented a remarkable example of natural selection in a tropical butterfly species that fought back - genetically speaking - against a highly invasive, male-killing bacteria.
Within 10 generations that spanned less than a year, the proportion of males of the Hypolimnas bolina butterfly on the South Pacific island of Savaii jumped from a meager 1 percent of the population to about 39 percent. The researchers considered this a stunning comeback and credited it to the rise of a suppressor gene that holds in check the Wolbachia bacteria, which is passed…
NASCAR guys may be on to something. It turns out that drafting, even on busy highways, could cut congestion, save fuel and cut greenhouse gas emissions, according to research published today in the International Journal of the Environment and Pollution.
As populations grow and the number of vehicles on the roads in cities and motorways across Europe, North America and the developing world, rises, traditional ways of tackling the problem, such as simply building more roads or improving public transport are becoming less and less effective.
Automated highway systems are one of the many…
A pooled analysis of data from previous studies suggests that cigarette smoking appears to be associated with a reduced risk for developing Parkinson’s disease, with long-term and current smokers at the lowest risk, according to a report in the July issue of Archives of Neurology.
Several studies have suggested that patients with Parkinson’s disease are less likely to be smokers, according to background information in the article.
“Recent studies also suggested that Parkinson’s disease risk is particularly low in active smokers with a long history of intense smoking; some even suggested dose…
A fat-derived protein known for its effects on the liver and skeletal muscle might also serve as an energy-conserving signal to the brain during periods of starvation, suggests a new study.
The substance, known as adiponectin, acts on the brain to boost appetite and slow energy expenditure in an effort to maintain adequate fat stores during lean times, the researchers report.
“Energy homeostasis may be mediated by both short-term regulators, such as gut hormones, and long-term regulators,” said Takashi Kadowaki of the University of Tokyo. “In this study, we identified, for the first time, a…
A recent study in Journal of Neuroimaging suggests that cognitively normal adults exhibiting atrophy of their temporal lobe or damage to blood vessels in the brain are more likely to develop Alzheimer’s disease. Older adults showing signs of both conditions were seven-times more likely to develop Alzheimer’s than their peers.
“Alzheimer’s disease, a highly debilitating and ultimately fatal neurological disease, is already associated with other risk factors such as poor cognitive scores, education or health conditions,” says study author Caterina Rosano. “This study, because it focused on…
Increased exposure to common chemicals may impact ovarian development, says Dr. Paul Fowler, of the University of Aberdeen, Scotland. His research showed that exposing a developing female sheep fetus to low doses of chemicals in the modern-day environment can disturb the development of the ovary
“Our ‘real life’ model exposed developing sheep fetuses by pasturing their mothers on fields fertilised with either inorganic fertiliser, the control group, or, in the case of the treatment group, with digested human sewage sludge, before and during pregnancy”, said Dr. Fowler.
“ We examined the…
Differences in immune systems have been found in African Americans with multiple sclerosis (MS) compared to Caucasians, possibly offering a clue why African Americans experience more disability with MS than Caucasians, according to a study published in the July 3, 2007, issue of Neurology.
For the study, researchers compared levels of antibodies in the cerebrospinal fluid of 66 African Americans to 132 Caucasians with MS.
The study found antibody levels in the cerebrospinal fluid of African Americans with MS were 29 percent higher than levels found in affected Caucasians.
“The findings show…
A scientific indicator of how easily distracted you are has been designed by a UCL (University College London) psychologist. It could be used as another assessment tool during the recruitment process and would have particular benefits in fields where employee distraction could lead to fatal errors.
People who are more easily distracted are at greater risk of being involved in accidents.
Professor Nilli Lavie, UCL Psychology, who led the research published in Psychological Science, said: “When you are easily distracted, you are more liable to do things like put your keys in the fridge or…
A new study by researchers at the Massachusetts General Hospital’s (MGH) Center for Mental Health and Media dispels some myths and uncovers some surprises about young teens and violent video and computer games.
The study, published in the July issue of Journal of Adolescent Health, is the first to ask middle-school youth in detail about the video and computer games they play and to analyze how many of those titles are rated M (Mature – meant for ages 17 and up). It is also the first to ask children why they play video games. Some of the more striking findings include:
- Almost all young…
Recently we started this feature of interviews with leading scientists and thinkers on the subject of energy. The first interview was with Dennis M. Bushnell, Chief Scientist, NASA, Langley Research Center. This is the second of what will be an ongoing series of interviews in the weeks ahead. Regular readers of this blog know that I believe that facing and solving the multiple issues concerning energy is the single most pressing problem that we face as a species. There is a lot of media coverage about energy, alternative energy and global warming, but what has…