Biology

Why plans to achieve zero suicides might actually be counterproductive

Genetics - ср, 2018-10-17 19:00
Health bodies and politicians are aiming for zero suicides, but doctors are warning this ambitious goal is simply unrealistic
Категории: Biology

World’s oldest fossils might turn out to just be ancient rocks

Genetics - ср, 2018-10-17 19:00
In 2016, researchers unveiled 3.7-billion-year-old fossils – a reassessment suggests the ‘fossils’ are actually physical scars left when the rocks were deformed
Категории: Biology

Cosmic supercluster is largest object ever seen in the early universe

Genetics - ср, 2018-10-17 17:00
A gigantic supercluster of galaxies that existed just two billion years after the big bang could tell us how much dark matter was around in the early universe
Категории: Biology

Brief Answers to the Big Questions review: seeking the real Hawking

Genetics - ср, 2018-10-17 16:00
Stephen Hawking peered deep into black holes and helped integrate the biggest ideas in physics. But the extraordinary genius was very much a man of his times
Категории: Biology

2019 Breakthrough Prize winners set to receive share in $22 million

Genetics - ср, 2018-10-17 16:00
Silicon valley’s Breakthrough Prize reveals the 21 scientists who have been recognized this year for work in drug design, biology, astrophysics, and mathematics
Категории: Biology

Human placenta stem cells help people recover from hip surgery

Genetics - ср, 2018-10-17 14:30
The placenta is usually discarded after childbirth but it's a source of mesenchymal stem cells – and they help people regain muscle strength after hip surgery
Категории: Biology

Gravitational waves from black hole pairs could act like tractor beams

Genetics - ср, 2018-10-17 13:50
When two black holes orbit one another, they create a swirling vortex of gravitational waves that could trap any nearby objects like a sci-fi tractor beam
Категории: Biology

Sneak peek at Hawking’s last book, Brief Answers to the Big Questions

Genetics - ср, 2018-10-17 13:00
Do black holes eat information or do zero-energy particles nicknamed "hairs" somehow store it instead? Before he died, Stephen Hawking was working on new ideas, as this exclusive extract shows
Категории: Biology

Male birds can be good singers or good looking, but not both

Genetics - ср, 2018-10-17 01:01
The prettier the bird, the worse it sings. A study of over 500 species has revealed that birds evolve to attract mates in one of two ways, and don’t combine them
Категории: Biology

Special coating gives condoms self-lubricating powers

Genetics - ср, 2018-10-17 01:01
A polymer coating turns condoms slippery once it comes in contact with body fluids – and it doesn’t dry out
Категории: Biology

Wildlife photography prize goes to stunning picture of golden monkeys

Genetics - ср, 2018-10-17 00:00
Hellbenders, vampire finches, and mud-daubers were among animals depicted in winning photographs in the 2018 Wildlife Photographer of the Year competition
Категории: Biology

Nicotine exposure of male mice produces behavioral impairment in multiple generations of descendants

PLOS Biology (new articles) - вт, 2018-10-16 23:00

by Deirdre M. McCarthy, Thomas J. Morgan Jr., Sarah E. Lowe, Matthew J. Williamson, Thomas J. Spencer, Joseph Biederman, Pradeep G. Bhide

Use of tobacco products is injurious to health in men and women. However, tobacco use by pregnant women receives greater scrutiny because it can also compromise the health of future generations. More men smoke cigarettes than women. Yet the impact of nicotine use by men upon their descendants has not been as widely scrutinized. We exposed male C57BL/6 mice to nicotine (200 μg/mL in drinking water) for 12 wk and bred the mice with drug-naïve females to produce the F1 generation. Male and female F1 mice were bred with drug-naïve partners to produce the F2 generation. We analyzed spontaneous locomotor activity, working memory, attention, and reversal learning in male and female F1 and F2 mice. Both male and female F1 mice derived from the nicotine-exposed males showed significant increases in spontaneous locomotor activity and significant deficits in reversal learning. The male F1 mice also showed significant deficits in attention, brain monoamine content, and dopamine receptor mRNA expression. Examination of the F2 generation showed that male F2 mice derived from paternally nicotine-exposed female F1 mice had significant deficits in reversal learning. Analysis of epigenetic changes in the spermatozoa of the nicotine-exposed male founders (F0) showed significant changes in global DNA methylation and DNA methylation at promoter regions of the dopamine D2 receptor gene. Our findings show that nicotine exposure of male mice produces behavioral changes in multiple generations of descendants. Nicotine-induced changes in spermatozoal DNA methylation are a plausible mechanism for the transgenerational transmission of the phenotypes. These findings underscore the need to enlarge the current focus of research and public policy targeting nicotine exposure of pregnant mothers by a more equitable focus on nicotine exposure of the mother and the father.
Категории: Biology, Journals

Nicotine exposure in male mice may trigger ADHD in their offspring

Genetics - вт, 2018-10-16 20:00
Mice are more active and have attention problems if their fathers had nicotine in their diet, perhaps because the chemical triggers epigenetic changes in sperm
Категории: Biology

Let’s embrace the joy of moonmoons and more playful scientific terms

Genetics - вт, 2018-10-16 18:30
Some say the astronomical term moonmoon makes light of a serious field of study, but it seems a shame to abandon it for po-faced alternatives
Категории: Biology

Making games like Red Dead Redemption 2 shouldn’t be such hard work

Genetics - вт, 2018-10-16 17:40
Reports that 2018’s blockbuster video game saw people working 100-hour weeks are troubling, given that tech firms could make workers’ lives easier, says Michael Cook
Категории: Biology

Half-hearted cannabis legalisation move leaves patients in limbo

Genetics - вт, 2018-10-16 16:07
Medical cannabis is to be available in the UK from November, but tight restrictions will drive patients to alternative sources, says Henry Fisher
Категории: Biology

Alien life could spread between solar systems on interstellar rocks

Genetics - вт, 2018-10-16 15:45
Researchers have calculated that living organisms may be able to hitch a ride aboard interstellar rocks to spread not only between planets, but across the galaxy
Категории: Biology

The Overstory by Richard Powers – is eco epic set to win Booker prize?

Genetics - вт, 2018-10-16 14:00
Wonder about the natural world and an extraordinary depth of ecological insight combine to create a profound, urgent novel tipped to take the £50,000 Man Booker prize
Категории: Biology

Bill Gates leads global call to accept realities of a warming planet

Genetics - вт, 2018-10-16 12:30
A coalition of major global figures say we must do much more to adapt to our rapidly warming world, and we need to do it fast
Категории: Biology

Electric chewing gum zaps your tongue to create a virtual flavour hit

Genetics - вт, 2018-10-16 08:00
An 'unlimited chewing gum' uses an electric charge to trick you into experiencing flavours – and they don’t fade in the way chewing gum flavour usually does
Категории: Biology