Mostrar mensagens com a etiqueta 2017-02. Mostrar todas as mensagens
Mostrar mensagens com a etiqueta 2017-02. Mostrar todas as mensagens

sábado, 4 de março de 2017

Peixe sem olhos...

... e que dorme apenas 2h:
http://www.dailymail.co.uk/sciencetech/article-4253674/Cavefish-study-shows-humans-evolve-sleep-less.html

quarta-feira, 1 de março de 2017

domingo, 26 de fevereiro de 2017

Fotografar o buraco negro no centro da Via Láctea

De forma indirecta vai ser tentado:
https://www.theguardian.com/science/2017/feb/26/black-hole-telescope-big-as-earth-event-horizon-project-sagittarius-a

terça-feira, 14 de fevereiro de 2017

Fractais e Inkblots...

http://www.dailymail.co.uk/sciencetech/article-4225270/FRACTALS-key-images-Rorschach-inkblots.html

Citando:
"From bats to jack-o-lanterns, Rorschach’s inkblots brought out a vast array of image associations during their use, with up to 300 different images recorded for each of the 10 blots. The top image shows Rorschach's inkblot, while the bottom shows it with the fractal pattern removed"

Ratos à prova de coca?

http://www.independent.co.uk/news/science/mice-genetically-modified-cocaine-drug-addiction-research-lab-university-british-columbia-a7577356.html
Citando:
“That plasticity allows for the pruning of some neural pathways and the formation of others, enabling the brain to adapt and to learn.
“Ideally, we would need to find a molecule that blocks formation of a memory of a drug-induced high, while not interfering with the ability to remember important things.”
Her colleague, graduate student Andrea Globa, added: “Through genetic engineering, we hard-wired in place the synapses in the reward circuits of these mice.
“By preventing the synapses from strengthening, we prevented the mutant mice from ‘learning’ the memory of cocaine, and thus prevented them from becoming addicted.”

Poluição do fundo do mar estudada (e perdura por décadas aparentemente)

(os estudos tipicamente analisam até 2000m, este não):
http://www.nature.com/articles/s41559-016-0051

Citando:

  • "POPs were released into the environment through industrial accidents and discharges, leakage from landfills, or incomplete incineration 7 . Two key POPs are polychlorinated biphenyls (PCBs, used as dielectric fluid) and polybrominated diphenyl ethers (PBDEs, used as flame retardants). From the 1930s to when PCB production ceased in the 1970s, the total global production was ~1.3 million tonnes 8 . Approximately 65% is thought to be contained in landfills or still within electrical equipment, with the other 35% residing in coastal sediments and open oceans 9 . These pollutants are invulnerable to natural degradation 10 and so persist in the environment for decades. Moreover they can spread great distances, including to seemingly isolated environments, such as polar regions and the open ocean 3 .

Pollutants entering the deep sea are deposited in sediments and can readily accumulate in the food chain 11 . Studies on deep-sea organisms have reported higher concentrations than in nearby surface-water species 11,12 . However, although these studies are described as ‘deep sea’, they rarely extend beyond the continental shelf (<2,000 m), so contamination at greater distances from shore and at extreme depths is hitherto unknown."

Nova supernova detectada muito cedo...

O que permite recolher mais dados sobre o evento:
http://www.space.com/35689-supernova-baby-discovery-star-explosions.html

segunda-feira, 13 de fevereiro de 2017

O que acontece quando aprendemos a tocar piano?

https://www.publico.pt/2017/02/11/ciencia/noticia/como-e-que-os-neuronios-se-organizam-quando-aprendemos-a-tocar-piano-1761480#

terça-feira, 7 de fevereiro de 2017

Proteínas em cabelos podem ser usadas em investigações forenses

Num futuro próximo. As proteínas degradam-se menos que o ADN com o tempo:
http://www.techtimes.com/articles/176792/20160908/when-dna-fails-a-single-strand-of-hair-may-save-the-day.htm
Citando:
"A breakthrough study has established that proteins found in human hair can work like fingerprints in the arena of crime investigation. This is because hair protein is unique to each individual and is more effective than traditional DNA profiling used in forensic analysis of human remains.
The new study beats the limitations posed by the conventional DNA profiling used by forensic scientists. It asserts that proteins are more stable and can offer accurate identification of human remains.
Details of the protein-centric hair analysis technique were published in PLOS ONE. According to lead author Brad Hart, a forensic scientist at the Lawrence Livermore National Laboratory (LLNL), the protein analysis will be a "game changer""

sábado, 21 de janeiro de 2017

Livro recomenda saltar o pequeno-almoço?

Ou ter cuidado com o que se come nele:
http://m.independent.ie/life/food-drink/food-news/could-skipping-breakfast-actually-be-the-key-to-maximising-your-health-35374887.html
Citando:
"Fast forward to this century, and cabbage soup diets are still used by those in search of the holy grail of weight loss -although, in terms of popularity, they've been supplanted by Dukan, South Beach, the 5:2, Paleo, alkaline and blood type diets, to name a few.(...)
If you absolutely can't survive without your morning meal, Professor Kealey says the ideal breakfast would probably be a boiled egg, followed by strawberries and cream, strawberries having a lower glycaemic index than other foods.
Dietitian Sarah Keogh has a trinity of foods she thinks should make up a healthy breakfast. "It's very good to get the wholegrain in, because we know that it helps reduce heart disease and they have antioxidants and B vitamins.
"Secondly, I would always look to get some sort of fruit or vegetable in there, something as simple as a banana or a few berries. And then some protein - nut butters like peanut or almond are fantastic and some people like an egg in a morning. Seeds are also brilliant, such as a couple of teaspoons of sunflower seeds into your porridge.""