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Rescooped by Mafalda from Plant Pathogenomics
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BioEssays: Sex or no sex: Evolutionary adaptation occurs regardless (2014)

BioEssays: Sex or no sex: Evolutionary adaptation occurs regardless (2014) | science board | Scoop.it

All species continuously evolve to adapt to changing environments. The genetic variation that fosters such adaptation is caused by a plethora of mechanisms, including meiotic recombination that generates novel allelic combinations in the progeny of two parental lineages. However, a considerable number of eukaryotic species, including many fungi, do not have an apparent sexual cycle and are consequently thought to be limited in their evolutionary potential. As such organisms are expected to have reduced capability to eliminate deleterious mutations, they are often considered as evolutionary dead ends. However, inspired by recent reports we argue that such organisms can be as persistent as organisms with conventional sexual cycles through the use of other mechanisms, such as genomic rearrangements, to foster adaptation.


Via Kamoun Lab @ TSL
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Knapco's curator insight, February 19, 2014 5:08 AM

Verticillium dahliae is among 20% of fungal species lacking sexual cycle of reproduction. However, the authors suggest that its genome contains a high amount of transposable elements (TE) which may drive genome evolution in this pathogen. TEs are DNA sequences that can change their position within genome and can impact the genome by inducing gene knockouts, modulating gene regulation or causing double-stranded DNA breaks. These sources of variability enable evolution: selection and adaptaion to plant hosts and evolution of fungal aggressiveness.

Similar asexual mechanisms facilitate genome evolution in other eukaryotes, known to be plant pathogens: Phytophthora infestans causing potato blight, Leptosphaeria maculans causing stem canker on Brassica, Blumeria graminis causing powdery mildew, Alternaria spp., Fusarium spp., Mycosphaerella graminicola...

Steve Marek's curator insight, March 5, 2014 9:01 AM

Textbook stuff!

Rescooped by Mafalda from ScienceNow
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Storytelling Of Science: Bill Nye

Bill Nye, astrophysicist Neil deGrasse Tyson, evolutionary biologist Richard Dawkins, theoretical physicist Brian Greene, Science Friday's Ira Flatow, popular science fiction writer Neal Stephenson, executive director of the World Science Festival Tracy Day, and Origins Project director Lawrence Krauss as they discuss the stories behind cutting edge science from the origin of the universe to a discussion of exciting technologies that will change our future. They demonstrate how to convey the excitement of science and the importance helping promote a public understanding of science. 


(Video by Black Chalk Productions via the Origins Project)


Via Jasmin Rez, iSargantana
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Jasmin Rez's curator insight, April 24, 2013 3:28 AM

"They discuss the stories behind cutting edge science from the origin of the universe to a discussion of exciting technologies that will change our future. They demonstrate how to convey the excitement of science and the importance helping promote a public understanding of science." 

Rescooped by Mafalda from :: The 4th Era ::
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5 Science Resources For, Well, Science Teachers ~ TeachThought

5 Science Resources For, Well, Science Teachers ~ TeachThought | science board | Scoop.it

by Dawn Casey-Rowe

 

"Truth is often stranger than fiction, and in the case of current events, there are so many science topics on the forefront of policy and society that at times it might seem that it is a script for a sci-fi movie. Everything from global warming, natural disaster, cloning, GMO, fracking debates, invasive species, medical ethics, and geopolitical issues–science is everywhere in news, politics, and world events. A lot of it is exciting if you stop a moment for consideration.

 

"This week’s Learnist feature is about science–especially weird science, which will attract the young and old alike."

 


Via Jim Lerman
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Rescooped by Mafalda from leapmind
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Artificial graphene could outperform the real thing | ZeitNews

Artificial graphene could outperform the real thing | ZeitNews | science board | Scoop.it

A new breed of ultra thin super-material has the potential to cause a technological revolution.


Via LeapMind
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Rescooped by Mafalda from Adult Stem Cells Repair Body
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Stanford creates first PhD program in stem cell science | "Latest Stem Cells News"

Stanford creates first PhD program in stem cell science | "Latest Stem Cells News" | science board | Scoop.it

Via EJ Morris
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EJ Morris's curator insight, December 5, 2013 12:43 PM

Stem Cells are the Present..and the FUTURE of Wellness and regenerative medicine ...and I don't have a PhD in STEM CELL SCIENCE..  ( Yet ) , ...  but I sure know stem cells are keeping me  Youthful .. and ALIVE.. (specifically, )  my Adult Stem Cells are rejuvenating , renewing and healing my worn and aging tissues and organs ...  Listen to Christian Drapeau, a noted stem cell scientist and best selling stem cell science author , here..

http://www.adult-stemcells-blog.com/stem-cell-scientist.html

 

Rescooped by Mafalda from Digital Delights for Learners
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Spongelab | A Global Science Community - with science animation, images, games & more

Spongelab | A Global Science Community - with science animation, images, games & more | science board | Scoop.it
Spongelab is an online learning platform with science animations, images, videos and games integrated into a teacher content management system.

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Via Ana Cristina Pratas
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