Τρίτη, 1 Απριλίου 2014

ScienceDaily: Most Popular News

ScienceDaily: Most Popular News


Erectile dysfunction can be reversed without medication

Posted: 28 Mar 2014 07:29 AM PDT

Men suffering from sexual dysfunction can be successful at reversing their problem by focusing on lifestyle factors and not just relying on medication, according to research. Researchers have highlighted the incidence of erectile dysfunction and lack of sexual desire among Australian men aged 35-80 years.

'Mini heart' invented to help return venous blood

Posted: 27 Mar 2014 09:31 AM PDT

A new organ has been invented to help return blood flow from veins lacking functional valves. A rhythmically contracting cuff made of cardiac muscle cells surrounds the vein acting as a 'mini heart' to aid blood flow through venous segments. The cuff can be made of a patient's own adult stem cells, eliminating the chance of implant rejection.

Dying cells in fruit fly alert neighboring cells to protect themselves: As a result, neighbors become harder to kill

Posted: 27 Mar 2014 08:12 AM PDT

Cells usually self-destruct when irreparable glitches occur in their DNA. Programmed cell death, or apoptosis, helps insure that cells with damaged DNA do not grow and replicate to produce more mutated cells. Apoptosis thereby helps protect and insure the survival of the organism. Scientists now report that a dying Drosophila melanogaster larvae cell alerts neighboring cells that they are in danger of suffering a similar fate.

Inbreeding in woolly mammoths: Neck rib provide clues about decline and eventual extinction

Posted: 25 Mar 2014 06:58 AM PDT

Researchers recently noticed that the remains of woolly mammoths from the North Sea often possess a 'cervical' (neck) rib -- in fact, 10 times more frequently than in modern elephants (33.3 percent versus 3.3 percent). In modern animals, these cervical ribs are often associated with inbreeding and adverse environmental conditions during pregnancy. If the same factors were behind the anomalies in mammoths, this reproductive stress could have further pushed declining mammoth populations towards ultimate extinction.

Health-care professionals should prescribe sleep to prevent, treat metabolic disorders, experts argue

Posted: 24 Mar 2014 05:05 PM PDT

Evidence increasingly suggests that insufficient or disturbed sleep is associated with metabolic disorders such as type 2 diabetes and obesity, and addressing poor quality sleep should be a target for the prevention -- and even treatment -- of these disorders. Addressing some types of sleep disturbance -- such as sleep apnea -- may have a directly beneficial effect on patients' metabolic health, say the authors. But a far more common problem is people simply not getting enough sleep, particularly due to the increased use of devices such as tablets and portable gaming devices.

Time out: Spanking babies is surprisingly common, U.S. study finds

Posted: 16 Mar 2014 06:09 PM PDT

The same hands that parents use to lovingly feed, clothe and bathe their babies are also commonly used to spank their bundles of joy. A new study found that 30 percent of 1-year-old children were spanked at least once in the past month by their mother, father or both parents. A long-time topic of debate, spanking children is a common practice among U.S. parents.

How Were The Egyptian Pyramids Built?

Posted: 28 Mar 2008 07:43 AM PDT

The Aztecs, Mayans and ancient Egyptians were three very different civilizations with one very large similarity: pyramids. However, of these three ancient cultures, the Egyptians set the standard for what most people recognize as classic pyramid design: massive monuments with a square base and four smooth-sided triangular sides, rising to a point. The Aztecs and Mayans built their pyramids with tiered steps and a flat top.

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