Riviste scientifiche

Every man in Spain was wiped out 4500 years ago by hostile invaders

New Scientist - Ve, 28/09/2018 - 08:00
When a new group of people arrived on the Iberian peninsula 4500 years ago, local males stopped passing on their genes – suggesting they were supplanted or killed

[Department of Error] Department of Error

The Lancet - Ve, 28/09/2018 - 00:30
The Lancet. GLOBOCAN 2018: counting the toll of cancer. Lancet 2018; 392: 985—In this Editorial, the estimate of 30 million deaths from cancer by 2030 was incorrect. The number should be 13 million deaths. This correction has been made to the online version as of Sept 27, 2018.

Pollution threatens to wipe out half of all orca communities

New Scientist - Gi, 27/09/2018 - 20:00
Ten of the 19 orca populations in the oceans could vanish within a century because of the effects of reproduction-disrupting PCB chemicals

Laser beams have gravity and can warp the fabric of the universe

New Scientist - Gi, 27/09/2018 - 15:47
Even though laser beams have no mass, they do have a tiny amount of gravity, which allows them to drag and warp space and slow down time as they propagate

Japanese space hoppers capture the sun moving across an asteroid sky

New Scientist - Gi, 27/09/2018 - 15:10
Japanese landers on the asteroid Ryugu have sent back more stunning images and video of the alien landscape

We challenged MI5’s mass surveillance. Then they spied on us

New Scientist - Gi, 27/09/2018 - 14:32
States spying on the very organisations that challenge their surveillance power demonstrates how important such work is, says Privacy International’s Edin Omanovic

Monkeypox has reached the UK – here’s what you need to know

New Scientist - Gi, 27/09/2018 - 13:09
Three people in the UK have caught the tropical disease, a relative of smallpox, the first time there have been cases in this country. But the smallpox vaccine provides immunity.

Paralysis need not mean paralysis for life

New Scientist - Gi, 27/09/2018 - 12:00
Despite prevailing medical wisdom saying it shouldn't work, implants have allowed paralysed people to walk again. We need to pin down the science to help others

Mathematicians must be more prepared to test their truths

New Scientist - Gi, 27/09/2018 - 11:00
Mathematical proofs embody a Platonic ideal of eternal truth. Two major contested proofs this week show the need for more controversy, not less

Cats are actually useless at catching rats – they prefer smaller prey

New Scientist - Gi, 27/09/2018 - 11:00
You might think your cat is working hard to keep your home rat-free, but actually the rodents are just hiding

[Comment] Reduce air pollution to beat NCDs: from recognition to action

The Lancet - Gi, 27/09/2018 - 00:30
Air pollution is now recognised as the second leading cause of non-communicable disease (NCD) deaths after tobacco smoking, causing more than 5 million such deaths each year, and 7 million deaths in total, including communicable diseases.1 NCDs caused by air pollution include heart disease, stroke, chronic obstructive pulmonary disease, and lung cancer. The health impacts of air pollution may be even higher than 5 million NCD deaths per year,1 given recent evidence indicating even larger health impacts for those diseases at current exposures.

Delivery outcomes in term births after bariatric surgery: Population-based matched cohort study

PLoS Medicine - Me, 26/09/2018 - 23:00

by Olof Stephansson, Kari Johansson, Jonas Söderling, Ingmar Näslund, Martin Neovius

Background

Obesity increases the risk of adverse delivery outcomes. Whether weight loss induced by bariatric surgery influences these risks remains to be determined. The objective was to investigate the risk of adverse delivery outcomes among post-surgery women compared with women without bariatric surgery history but with similar characteristics.

Methods and findings

We identified 801,443 singleton live-born term births (≥37 gestational weeks) in the Swedish Medical Birth Register between 1 January 2006 and 31 December 2013, of which 1,929 were in women with a history of bariatric surgery and a pre-surgery weight available from the Scandinavian Obesity Surgery Registry. For each post-surgery delivery, up to 5 control deliveries were matched by maternal pre-surgery BMI (early-pregnancy BMI used for controls), age, parity, smoking, education, height, country of birth, and delivery year (N post-surgery deliveries:matched controls = 1,431:4,476). The main outcome measures were mode of delivery, induction of labor, post-term pregnancy (≥42 + 0 gestational weeks), epidural analgesia, fetal distress, labor dystocia, peripartum infection, obstetric anal sphincter injury (perineal tear grade III–IV), and postpartum hemorrhage. Among the women with a history of bariatric surgery, the mean pre-surgery BMI was 42.6 kg/m2, the median surgery-to-conception interval was 1.4 years, and the mean BMI loss between surgery and early pregnancy was 13.5 kg/m2 (38 kg). Compared to matched control women, post-surgery women were less likely to have cesarean delivery (18.2% versus 25.0%, risk ratio [RR] 0.70, 95% CI 0.60–0.80), especially emergency cesarean (6.8% versus 15.1%, RR 0.40, 95% CI 0.31–0.51). Post-surgery women also had lower risks of instrumental delivery (5.0% versus 6.5%, RR 0.73, 95% CI 0.53–0.98), induction of labor (23.4% versus 34.0%, RR 0.68, 95% CI 0.59–0.78), post-term pregnancy (4.2% versus 10.3%, RR 0.40, 95% CI 0.30–0.53), obstetric anal sphincter injury (1.5% versus 2.9%, RR 0.46, 95% CI 0.25–0.81), and postpartum hemorrhage (4.6% versus 8.0%, RR 0.58, 95% CI 0.44–0.76). Since this study was not randomized, a limitation is the possibility of selection bias, despite our efforts using careful matching.

Conclusions

Bariatric-surgery-induced weight loss was associated with lower risks for adverse delivery outcomes in term births.

Manta rays have a special trick for filtering very tiny bits of food

New Scientist - Me, 26/09/2018 - 20:00
Manta rays use a filter system to sieve food from the water, but the filter captures food particles so small they should pass through – and now we know how

A swarm of robots weaves giant cocoons using fibreglass thread

New Scientist - Me, 26/09/2018 - 20:00
A new robot called Fiberbot wraps itself in a cocoon, creating towering fibreglass tubes that could be used for constructing buildings and bridges

The 7 non-human mammals where females rule the roost

New Scientist - Me, 26/09/2018 - 19:00
In the wild, males often dominate leadership roles, but not in seven species of mammals ranging from orcas and African elephants to spotted hyenas

Fat and proud: Why body-positive activists say obesity can be healthy

New Scientist - Me, 26/09/2018 - 19:00
Growing calls for "fat acceptance" fly in the face of accepted medical advice, but studies show you can be overweight and healthy

Riemann hypothesis likely remains unsolved despite claimed proof

New Scientist - Me, 26/09/2018 - 17:30
Mathematician Michael Atiyah has presented his claimed proof of one of the most famous unsolved problems in maths, but others remain cautiously sceptical

Nina Wright joins New Scientist as Chief Executive

New Scientist - Me, 26/09/2018 - 12:00
New Scientist is pleased to announce Nina Wright has joined the company as Chief Executive. She previously worked as a Chief Commercial Officer for events company UBM

Neanderthals had dexterous hands that could have held tools like a pen

New Scientist - Me, 26/09/2018 - 11:00
Our extinct Neanderthal cousins had big bulky hands that look clumsy, but their bones reveal that they could hold objects in the same way we hold pens

Female flies evolved serrated genitals that get in the way during sex

New Scientist - Me, 26/09/2018 - 01:01
Spotted-wing drosophila have evolved a special organ for laying their eggs in fruit, but it makes it difficult for males to hold on when they mate
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