Τρίτη, 3 Ιουνίου 2014

ScienceDaily: Most Popular News

ScienceDaily: Most Popular News


How to erase a memory –- and restore it: Researchers reactivate memories in rats

Posted: 01 Jun 2014 12:06 PM PDT

Researchers have erased and reactivated memories in rats, profoundly altering the animals' reaction to past events. The study is the first to show the ability to selectively remove a memory and predictably reactivate it by stimulating nerves in the brain at frequencies that are known to weaken and strengthen the connections between nerve cells, called synapses.

3-D bioprinting builds a better blood vessel

Posted: 30 May 2014 04:05 PM PDT

The tangled highway of blood vessels that twists and turns inside our bodies, delivering essential nutrients and disposing of hazardous waste to keep our organs working properly has been a conundrum for scientists trying to make artificial vessels from scratch. Now a team has made headway in fabricating blood vessels using a three-dimensional bioprinting technique.

Scientists control rapid re-wiring of brain circuits using patterned visual stimulation

Posted: 28 May 2014 07:49 AM PDT

Researchers have shown for the first time how the brain re-wires and fine-tunes its connections differently depending on the relative timing of sensory stimuli. In most neuroscience textbooks today, there is a widely held model that explains how nerve circuits might refine their connectivity based on patterned firing of brain cells, but it has not previously been directly observed in real time.

Red meat allergies likely result of lone star tick

Posted: 20 Feb 2014 07:27 AM PST

Lone star tick bites are likely the cause of thousands of cases of severe red meat allergies that are plaguing patients in Southeastern United States including Tennessee, North Carolina and Virginia and spreading up the Eastern Seaboard along with the deer population. The allergy can cause hives and swelling, as well as broader symptoms of anaphylaxis including vomiting, diarrhea, trouble breathing, and a drop in blood pressure. Persons with the allergy can go into a delayed anaphylactic shock four-six hours after eating red meat.

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