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terça-feira, 6 de julho de 2010

Novidades

Um Gel que vai substituir os Chumbos nos dentes, encher os canais das Raízes, e, mais tarde, ajudar a regenerar Ossos e Tecido!
Toda a gente vai passar a gostar dos Dentistas!


June 30, 2010
Gel Could Replace Fillings for Cavities and Replace Root Canal and Later Help Heal Bones and Tissue

A new gel could soon eliminate painful fillings and root canals.
* The technology doesn't prevent cavities; it heals teeth by regenerating them.
* Although this is good news for teeth, the research could also be applied to heal bones and other tissues in the body.

* Teeth Regeneration will only be used rarely. If a filling will work, then dentists will stick with the current cheaper and familiar option.
A new peptide, embedded in a soft gel or a thin, flexible film and placed next to a cavity, encourages cells inside teeth to regenerate in about a month, according to a new study in the journal ACS Nano.

Novas Baterias, muito mais avançadas, mas não para já...

A Guide to Recent Battery Advances

Battery breakthroughs could lower costs and improve performance for electric vehicles and renewable energy storage--but commercializing these new technologies will be challenging.
By Kevin Bullis

...The MIT researchers demonstrated a new battery electrode, based on specially treated carbon nanotubes, that last for thousands of cycles without any loss in performance. Batteries made from these electrodes could deliver enough power to propel large delivery vans or garbage trucks, for example, without the batteries being too heavy to be practical. (The researchers need to increase the thickness of the electrodes for them to be practical in these applications.) Companies such as A123 Systems, based in Watertown, MA, have also developed very high-power lithium-ion batteries, and other academic groups and startups are developing carbon nanotube-based ultracapacitors, which store energy using a different mechanism than batteries that's particularly useful for high power and long life.

Vejam o Vídeo

http://www.technologyreview.com/energy/25660/

Um novo Fármaco para domar o Apetite...

Scientists find natural way to curb your greed

July 5, 2010
(PhysOrg.com) -- University of Manchester scientists have discovered a naturally-occurring appetite suppressant that could be used to make a diet drug without side effects.
Professor Simon Luckman and Dr Garron Dodd believe the peptide hemopressin, which affects the reward part of the brain responsible for hedonistic behaviour, might treat some aspects of alcohol and drug abuse.
Dr Dodd, co-author of the findings published in the , explains: “It has long been known that the rewarding aspects of feeding behaviour influence our appetite, so that sometimes we eat for pleasure rather than hunger. This is because the cannabinoid system in the brain - a component of the naturally-existing circuitry responsible for reward - is affected by chemicals that are termed ‘agonists’ which bind to its receptors and increase the reward from feeding.

http://www.physorg.com/news197537769.html

Um novo material que poderá efectuar funções de Lógica E de Memória, o que quer dizer que os futuros PCs poderão não precisar de Discos Rígidos!



Logic test: Arrays of memristors located where these electrical contacts converge can perform logic and memory functions.
Credit: Wei Wu

Source: " 'Memristive' switches enable 'stateful' logic operations via material implication"
R. Stanley Williams et al.
Nature 464: 873-876

Results: Researchers at Hewlett-­Packard have shown that nanoscale circuit elements called memristors, which have previously been made into memory devices, can perform full Boolean logic, the type used for computation in computer processors.

Why it matters: Memristor logic devices are about an order of magnitude smaller than devices made from transistors, so they could pack more computing power into a given space. Memristor arrays that perform both logic and memory functions could eliminate the need to transfer data between a processor and a hard drive in future computers, which would save energy.


E Baleias Pré-Históricas que caçavam outras Baleias, como as Orcas, mas do tamanho dum Autocarro!


Gigantic Prehistoric Whale Hunted Other Whales

By Jeremy Hsu, LiveScience Senior Writer
posted: 30 June 2010 01:08 pm ET

A prehistoric leviathan that represented a more savage Moby Dick once hunted smaller whales around 12 million or 13 million years ago, researchers say.
Fossils of the whale's skull and foot-long teeth found in Peru suggest the monstrous sperm whales ranged in size from almost 43 feet (13 meters) to 59 feet (18 meters), or longer than a school bus. Just the skull alone reaches a length of almost 10 feet (3 meters).
The ancient sperm whale's killer arsenal included 14-inch- (36-cm)- long teeth resembling elephant tusks that allowed it to rip and tear its prey, unlike modern sperm whales that lack functional teeth in their upper jaws and rely upon suction to grab giant squid. 


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