Rabu, 01 Juli 2015

ScienceDaily: Top Science News

ScienceDaily: Top Science News

South Africans used milk-based paint 49,000 years ago

Posted: 30 Jun 2015 05:20 PM PDT

Scientists have discovered a milk-and ochre-based paint dating to 49,000 years ago that inhabitants may have used to adorn themselves with or to decorate stone or wooden slabs.

New model of cosmic stickiness favors 'Big Rip' demise of universe

Posted: 30 Jun 2015 12:52 PM PDT

Mathematicians and physicists have come up with a new approach to calculate cosmic viscosity and the formulation favors the 'Big Rip' scenario for the end of the universe.

Scientists program solitary yeast cells to say 'hello' to one another

Posted: 30 Jun 2015 11:17 AM PDT

Researchers have produced cell-to-cell communication in baker's yeast -- a first step in learning to build multicellular organisms or artificial organs from scratch.

Eye color may be linked to alcohol dependence

Posted: 30 Jun 2015 10:52 AM PDT

People with blue eyes might have a greater chance of becoming alcoholics, according to a unique new study by genetic researchers.

Repeated courses of antibiotics may profoundly alter children's development

Posted: 30 Jun 2015 09:12 AM PDT

A new animal study adds to growing evidence that multiple courses of commonly used antibiotics may have a significant impact on children's development. Female mice treated with two classes of widely used childhood antibiotics, including amoxicillin, gained more weight and developed larger bones than untreated mice. Both of the antibiotics also disrupted the gut microbiome, the trillions of microbes that inhabit the intestinal tract.

How small genetic change in Yersinia pestis changed human history

Posted: 30 Jun 2015 09:12 AM PDT

While studying Yersinia pestis, the bacteria responsible for epidemics of plague such as the Black Death, scientists found a single small genetic change that fundamentally influenced the evolution of the deadly pathogen, and thus the course of human history. They demonstrated how the acquisition of a single gene caused the shift of Y. pestis from causing a primarily gastrointestinal infection to a more serious and often fatal respiratory disease and how later modifications lead to infections associated with the bubonic plague.

Biodegradable, flexible silicon transistors

Posted: 30 Jun 2015 09:12 AM PDT

Researchers have come up with a new solution to alleviate the environmental burden of discarded electronics. They have demonstrated the feasibility of making microwave biodegradable thin-film transistors from a transparent, flexible biodegradable substrate made from inexpensive wood, called cellulose nanofibrillated fiber. This work opens the door for green, low-cost, portable electronic devices in future.

Exit dinosaurs, enter fishes

Posted: 30 Jun 2015 07:06 AM PDT

A pair of paleobiologists have determined that the world's most numerous and diverse vertebrates -- ray-finned fishes -- began their ecological dominance of the oceans 66 million years ago, aided by the mass extinction event that killed off dinosaurs.

Patients with recurrent depression have smaller hippocampi

Posted: 30 Jun 2015 07:05 AM PDT

The brains of people with recurrent depression have a significantly smaller hippocampus -- the part of the brain most associated with forming new memories -- than healthy individuals, a new global study of nearly 9,000 people reveals.

Smell fingerprints? Each person may have a unique sense of smell

Posted: 30 Jun 2015 07:05 AM PDT

Scientists have developed an 'olfactory fingerprint' test that may do more than just identify individuals.

Seeing a supernova in a new light

Posted: 30 Jun 2015 07:05 AM PDT

Type Ia supernovae are the 'standard candles' astrophysicists use to chart distance in the Universe. But are these dazzling exploding stars truly all the same? To answer this, scientists must first understand what causes stars to explode and become supernovae.

340 undiscovered meteorite impact sites on Earth, geologists calculate

Posted: 30 Jun 2015 05:02 AM PDT

Researchers have calculated the number of undiscovered meteorite impact sites on Earth's surface. Geologists say a total of 188 have been confirmed so far, and 340 are still awaiting discovery. Meteorite impacts have shaped the development of the Earth and life repeatedly in the past. The extinction of the dinosaurs, for instance, is thought to have been brought on by a mega-collision at the end of the Cretaceous period. But how many traces of large and small impacts have survived the test of time?

New genetic form of obesity, diabetes discovered

Posted: 30 Jun 2015 05:01 AM PDT

Scientists have discovered a new inherited form of obesity and type 2 diabetes in humans. Researchers discovered the new defect by sequencing the DNA of an extremely obese young woman and members of her family. In addition to an increased appetite leading to severe weight problems from childhood, she had type 2 diabetes, learning difficulties, and reproductive problems.
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