Sleep Is the Brain's Way of Staying in Balance [Video below]
The connections between neurons get weaker, not stronger, when we sleep—and that keeps brain cells from becoming overtaxed by waking events The resting brain is actually pretty busy, with nerve cells firing nearly as often as they do in a waking state. One common explanation for this activity holds that during sleep neural circuits replay important memories, a process that strengthens the connections among cells in those circuits, thereby aiding learning.
Researchers Giulio Tononi and Chiara Cirelli propose quite a different theory of what happens in the sleeping brain. They suggest that brain activity during slumber must weaken neural connections, not strengthen them, because strengthening would saturate the brain's circuitry and consume so much energy that the brain could not continue to encode new information.
In short, the authors propose that sleep is essential for synaptic homeostasis, a restoring of brain cells to a baseline state. They argue that this function is essential for all creatures and explains the ubiquitous need for sleep. Results of their experiments, conducted over two decades, so far confirm this hypothesis.
In this video of a talk presented at an Allen Institute for Brain Science symposium, Tononi presents this evidence and explains that sleep is the price we pay for the brain's ability to remodel itself in response to the events of waking life.
Living things can give off light via either luminescence or fluorescence. Luminescent animals make their own light, while fluorescent ones absorb and re-emit it.
Fireflies: Fireflies generate light through luminescence. An enzyme called luciferase facilitates the reaction, in which another molecule (usually a protein called a luciferin) releases light. Plans to create glowing Arabidopsis plants and roses involve engineering the plants to produce both luciferin and luciferase.
Jellyfish: Some jellyfish glow via fluorescence, thanks to green fluorescent protein, or GFP. The protein absorbs light at one wavelength and emits it at a different wavelength. Scientists have created a rainbow of fluorescent hues for use in the lab by mutating GFP and similar proteins.
The Google Impact Challenge has launched in India in an effort to support innovators who are exploring new ways to solve the world's most pressing problems. If you’re an Indian non-profit, tell us how you would use technology and innovative approaches to tackle problems in India and around the world. Four selected non-profits will each receive a Rs 3 crore Global Impact Award and assistance from Google to help make their project a reality.
http://phys.org/news/2013-08-upsalite-scientists-impossible-materia... Scientists make 'impossible material'... by accident
Researchers in Uppsala, Sweden accidentally left a reaction running over the weekend and ended up resolving a century-old chemistry problem. Their work has led to the development of a new material, dubbed Upsalite, with remarkable water-binding properties. Upsalite promises to find applications in everything from humidity control at home to chemical manufacturing in industry.
The work of psychologist Elizabeth Loftus, who has spent decades exposing flaws in eyewitness testimony, is gaining fresh traction in the U.S. legal system
Human-altered environmental conditions affect many species at the global scale. An extreme form of anthropogenic alteration is the existence and rapid increase of urban areas. A key question, then, is how species cope with urbanization. It has been suggested that rural and urban conspecifics show differences in behaviour and personality. However, (i) a generalization of this phenomenon has never been made; and (ii) it is still unclear whether differences in personality traits between rural and urban conspecifics are the result of phenotypic plasticity or of intrinsic differences. In a literature review, we show that behavioural differences between rural and urban conspecifics are common and taxonomically widespread among animals, suggesting a significant ecological impact of urbanization on animal behaviour. In order to gain insight into the mechanisms leading to behavioural differences in urban individuals, we hand-raised and kept European blackbirds (Turdus merula) from a rural and a nearby urban area under common-garden conditions. Using these birds, we investigated individual variation in two behavioural responses to the presence of novel objects: approach to an object in a familiar area (here defined as neophilia), and avoidance of an object in a familiar foraging context (defined as neophobia). Neophilic and neophobic behaviours were mildly correlated and repeatable even across a time period of one year, indicating stable individual behavioural strategies. Blackbirds from the urban population were more neophobic and seasonally less neophilic than blackbirds from the nearby rural area. These intrinsic differences in personality traits are likely the result of microevolutionary changes, although we cannot fully exclude early developmental influences. http://www.scientificamerican.com/podcast/episode.cfm?id=urbanizati...
Urbanization Alters Bird Behavior
Blackbirds living in a city were more leery of approaching a food source than were their country cousins. Two centuries ago, blackbirds typically lived out their lives in forest habitats. Today, the birds are one of the most common avian urban species. Researchers have shown that urban and rural blackbirds already differ from one another in their songs, the timing of reproduction and their risk of diseases. But could the country blackbird and its city cousin now have different personalities?
Scientists in Germany collected and hand-raised 28 urban birds and 25 from the country nearby. The researchers tested the birds to determine whether they approached or avoided new objects in a familiar environment. They performed the study three times over a year to see if the traits persisted.
And the urban birds avoided new objects near their feeders for significantly longer than did their rural relatives. The study appears in the journal Global Change Biology. [Ana Catarina Miranda et al., Urbanization and its effects on personality traits: a result of microevolution or phenotypic plasticity?]
The researchers say these personality differences may be related to genetic micro-evolutionary changes. And that the findings demonstrate two things. One is that urban and rural differences can be tested in a controlled experiment. The second is that blackbirds and many other species may be quickly evolving new behaviors in response to our rapidly urbanizing world.
Digestion is far too messy a process to accurately convey in neat numbers. The counts on food labels can differ wildly from the calories you actually extract, for many reasons At one particularly strange moment in my career, I found myself picking through giant conical piles of dung produced by emus—those goofy Australian kin to the ostrich. I was trying to figure out how often seeds pass all the way through the emu digestive system intact enough to germinate. My colleagues and I planted thousands of collected seeds and waited. Eventually, little jungles grew.
Clearly, the plants that emus eat have evolved seeds that can survive digestion relatively unscathed. Whereas the birds want to get as many calories from fruits as possible—including from the seeds—the plants are invested in protecting their progeny. Although it did not occur to me at the time, I later realized that humans, too, engage in a kind of tug-of-war with the food we eat, a battle in which we are measuring the spoils—calories—all wrong.
Almost every packaged food today features calorie counts in its label. Most of these counts are inaccurate because they are based on a system of averages that ignores the complexity of digestion. Recent research reveals that how many calories we extract from food depends on which species we eat, how we prepare our food, which bacteria are in our gut and how much energy we use to digest different foods.
Current calorie counts do not consider any of these factors. Digestion is so intricate that even if we try to improve calorie counts, we will likely never make them perfectly accurate.
http://www.indiaeducationdiary.in/showEE.asp?newsid=25015 Bhartiya City presents Edinburgh International Science Festival in Bengaluru
Building on the overwhelming success of its other cultural activities where Bhartiya City had played host to Slayer, Santana and Guns ‘n Roses, it will now present the 26th Edinburgh International Science Festival - the most exciting science festival in the world in Bengaluru.
The 10 day long festival starting from August 30 will be a splendid affair to make Science fun, exciting and engaging for young minds. The Science Festival is a strategic initiative by Bhartiya City, committed to curating exceptional cultural programs to engage and inspire the country’s youth and promoting culture, science and technology. This was announced today by Mr Snehdeep Aggarwal, Chairman of Bhartiya Group, Dr Simon Gage, Director and CEO of EISF and Mr Ian Felton, Deputy High Commissioner of Britain to India in a press conference in Bengaluru.
The Festival expects around 50,000 visitors that include school children and their parents. The event is organized by Bhartiya City and co-presented by Discovery Kids, Powered by Horlicks Promind and in association with British Council, Art Konnect and mycity4kids.com
Dr. Krishna Kumari Challa
http://www.bbc.co.uk/news/science-environment-23529849
Selfish traits not favoured by evolution, study shows
Aug 5, 2013
Dr. Krishna Kumari Challa
http://www.scidev.net/global/r-d/news/basic-science-linked-to-faste...
Basic science linked to faster economic growth
Productivity in basic sciences correlates with economic growth, but does not directly cause it
Scientific productivity is a better wealth growth predictor than many other competitiveness indices
But benefits of investment in science should be weighed against investment in other development projects
Aug 6, 2013
Dr. Krishna Kumari Challa
http://communities.washingtontimes.com/neighborhood/between-rock-an...
'Voodoo science' will not solve the causality-problem of EHS | Washington Times Communities c
Aug 7, 2013
Dr. Krishna Kumari Challa
http://www.motherjones.com/blue-marble/2013/08/watching-fox-makes-y...
Study: Watching Fox News Makes You Distrust Climate Scientists
Aug 8, 2013
Dr. Krishna Kumari Challa
Aug 8, 2013
Dr. Krishna Kumari Challa
Sleep Is the Brain's Way of Staying in Balance [Video below]
The connections between neurons get weaker, not stronger, when we sleep—and that keeps brain cells from becoming overtaxed by waking events
The resting brain is actually pretty busy, with nerve cells firing nearly as often as they do in a waking state. One common explanation for this activity holds that during sleep neural circuits replay important memories, a process that strengthens the connections among cells in those circuits, thereby aiding learning.
Researchers Giulio Tononi and Chiara Cirelli propose quite a different theory of what happens in the sleeping brain. They suggest that brain activity during slumber must weaken neural connections, not strengthen them, because strengthening would saturate the brain's circuitry and consume so much energy that the brain could not continue to encode new information.
In short, the authors propose that sleep is essential for synaptic homeostasis, a restoring of brain cells to a baseline state. They argue that this function is essential for all creatures and explains the ubiquitous need for sleep. Results of their experiments, conducted over two decades, so far confirm this hypothesis.
In this video of a talk presented at an Allen Institute for Brain Science symposium, Tononi presents this evidence and explains that sleep is the price we pay for the brain's ability to remodel itself in response to the events of waking life.
http://www.scientificamerican.com/article.cfm?id=sleep-brains-way-s...
Aug 8, 2013
Dr. Krishna Kumari Challa
How Brains See
Aug 9, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=agriculture-1863-m...
Agriculture and Invention in 1863: Handy Machines from the Archives of Scientific American [Slide Show]
These devices were designed to reduce the labor or increase the profit of farming
Aug 9, 2013
Dr. Krishna Kumari Challa
Aug 10, 2013
Dr. Krishna Kumari Challa
Living things can give off light via either luminescence or fluorescence. Luminescent animals make their own light, while fluorescent ones absorb and re-emit it.
Fireflies: Fireflies generate light through luminescence. An enzyme called luciferase facilitates the reaction, in which another molecule (usually a protein called a luciferin) releases light. Plans to create glowing Arabidopsis plants and roses involve engineering the plants to produce both luciferin and luciferase.
Jellyfish: Some jellyfish glow via fluorescence, thanks to green fluorescent protein, or GFP. The protein absorbs light at one wavelength and emits it at a different wavelength. Scientists have created a rainbow of fluorescent hues for use in the lab by mutating GFP and similar proteins.
Genetically engineered organisms: Using various techniques, many glowing animals have already been created in the lab, including cats, mice, monkeys, fish and a beagle.
http://www.sciencenews.org/view/generic/id/352252/description/A_glo...
Aug 11, 2013
Dr. Krishna Kumari Challa
http://www.afaqs.com/media/story/38356_Times-Now-identifies-the-Pow...
Times Now identifies the Power of Shunya with DuPont
http://www.powerofshunya.com/QuestForZero.aspx
Aug 12, 2013
Dr. Krishna Kumari Challa
Aug 12, 2013
Dr. Krishna Kumari Challa
http://theconversation.com/calorie-restriction-increases-longevity-...
Calorie restriction increases longevity – or does it?
Aug 13, 2013
Dr. Krishna Kumari Challa
Scientists shed light on near-death visions
http://www.dailytelegraph.com.au/technology/sci-tech/scientists-she...
Aug 13, 2013
Dr. Krishna Kumari Challa
Aug 13, 2013
Dr. Krishna Kumari Challa
https://impactchallenge.withgoogle.com/india2013#/zsl
A Better World, Faster
The Google Impact Challenge has launched in India in an effort to support innovators who are exploring new ways to solve the world's most pressing problems. If you’re an Indian non-profit, tell us how you would use technology and innovative approaches to tackle problems in India and around the world. Four selected non-profits will each receive a Rs 3 crore Global Impact Award and assistance from Google to help make their project a reality.
Aug 13, 2013
Dr. Krishna Kumari Challa
Aug 14, 2013
Dr. Krishna Kumari Challa
http://blogs.scientificamerican.com/guest-blog/2013/08/13/why-mosqu...
Why Mosquitoes Like You and Not Me
Aug 14, 2013
Dr. Krishna Kumari Challa
http://www.independent.co.uk/news/science/it-all-started-with-a-ban...
It all started with a bang, but the universe may not be expanding after all
Theoretical physicist Christof Wetterich publishes paper 'a Universe without expansion'
Aug 14, 2013
Dr. Krishna Kumari Challa
http://phys.org/news/2013-08-upsalite-scientists-impossible-materia...
Scientists make 'impossible material'... by accident
Researchers in Uppsala, Sweden accidentally left a reaction running over the weekend and ended up resolving a century-old chemistry problem. Their work has led to the development of a new material, dubbed Upsalite, with remarkable water-binding properties. Upsalite promises to find applications in everything from humidity control at home to chemical manufacturing in industry.
Aug 14, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=your-thoughts-can-...
Your Thoughts Can Release Abilities beyond Normal Limits
Better vision, stronger muscles—expectations can have surprising effects, research finds
Aug 15, 2013
Dr. Krishna Kumari Challa
Is psychology a real science? Interesting articles based on this Q:
http://blogs.scientificamerican.com/the-curious-wavefunction/2013/0...
Is psychology a “real” science? Does it really matter?
http://blogs.scientificamerican.com/psysociety/2013/08/13/psycholog...
Psychology’s brilliant, beautiful, scientific messiness.
Aug 15, 2013
Dr. Krishna Kumari Challa
Aug 15, 2013
Dr. Krishna Kumari Challa
http://www.sciencenews.org/view/generic/id/352421/description/Belie...
Belief in multiverse requires exceptional vision
Aug 15, 2013
Dr. Krishna Kumari Challa
http://www.huffingtonpost.com/2013/08/15/clever-word-art-scientist-...
Clever Word Art Spotlights Scientists' Ground Breaking Achievements
Aug 16, 2013
Dr. Krishna Kumari Challa
http://esciencenews.com/articles/2013/08/14/teleported.electronic.c...
Teleported by electronic circuit
Aug 16, 2013
Georgescu Dan
Aug 16, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=new-measure-of-con...
New Measure of Consciousness Tracks Our Waking States
Aug 17, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=evidence-based-jus...
Evidence-based Justice Acknowledges Our Corrupt Memories
The work of psychologist Elizabeth Loftus, who has spent decades exposing flaws in eyewitness testimony, is gaining fresh traction in the U.S. legal system
Aug 17, 2013
Dr. Krishna Kumari Challa
Aug 17, 2013
Dr. Krishna Kumari Challa
http://onlinelibrary.wiley.com/doi/10.1111/gcb.12258/abstract;jsess...
Urbanization and its effects on personality traits: a result of microevolution or phenotypic plasticity?
Abstract
Human-altered environmental conditions affect many species at the global scale. An extreme form of anthropogenic alteration is the existence and rapid increase of urban areas. A key question, then, is how species cope with urbanization. It has been suggested that rural and urban conspecifics show differences in behaviour and personality. However, (i) a generalization of this phenomenon has never been made; and (ii) it is still unclear whether differences in personality traits between rural and urban conspecifics are the result of phenotypic plasticity or of intrinsic differences. In a literature review, we show that behavioural differences between rural and urban conspecifics are common and taxonomically widespread among animals, suggesting a significant ecological impact of urbanization on animal behaviour. In order to gain insight into the mechanisms leading to behavioural differences in urban individuals, we hand-raised and kept European blackbirds (Turdus merula) from a rural and a nearby urban area under common-garden conditions. Using these birds, we investigated individual variation in two behavioural responses to the presence of novel objects: approach to an object in a familiar area (here defined as neophilia), and avoidance of an object in a familiar foraging context (defined as neophobia). Neophilic and neophobic behaviours were mildly correlated and repeatable even across a time period of one year, indicating stable individual behavioural strategies. Blackbirds from the urban population were more neophobic and seasonally less neophilic than blackbirds from the nearby rural area. These intrinsic differences in personality traits are likely the result of microevolutionary changes, although we cannot fully exclude early developmental influences.
http://www.scientificamerican.com/podcast/episode.cfm?id=urbanizati...
Urbanization Alters Bird Behavior
Blackbirds living in a city were more leery of approaching a food source than were their country cousins.
Two centuries ago, blackbirds typically lived out their lives in forest habitats. Today, the birds are one of the most common avian urban species. Researchers have shown that urban and rural blackbirds already differ from one another in their songs, the timing of reproduction and their risk of diseases. But could the country blackbird and its city cousin now have different personalities?
Scientists in Germany collected and hand-raised 28 urban birds and 25 from the country nearby. The researchers tested the birds to determine whether they approached or avoided new objects in a familiar environment. They performed the study three times over a year to see if the traits persisted.
And the urban birds avoided new objects near their feeders for significantly longer than did their rural relatives. The study appears in the journal Global Change Biology. [Ana Catarina Miranda et al., Urbanization and its effects on personality traits: a result of microevolution or phenotypic plasticity?]
The researchers say these personality differences may be related to genetic micro-evolutionary changes. And that the findings demonstrate two things. One is that urban and rural differences can be tested in a controlled experiment. The second is that blackbirds and many other species may be quickly evolving new behaviors in response to our rapidly urbanizing world.
Aug 17, 2013
Dr. Krishna Kumari Challa
http://www.redorbit.com/news/science/1112926279/brain-sides-equal-n...
Left Vs. Right: University Says Neither When It Comes To Brain Dominance
Aug 21, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=science-reveals-wh...
Science Reveals Why Calorie Counts Are All Wrong [Preview]
Digestion is far too messy a process to accurately convey in neat numbers. The counts on food labels can differ wildly from the calories you actually extract, for many reasons
At one particularly strange moment in my career, I found myself picking through giant conical piles of dung produced by emus—those goofy Australian kin to the ostrich. I was trying to figure out how often seeds pass all the way through the emu digestive system intact enough to germinate. My colleagues and I planted thousands of collected seeds and waited. Eventually, little jungles grew.
Clearly, the plants that emus eat have evolved seeds that can survive digestion relatively unscathed. Whereas the birds want to get as many calories from fruits as possible—including from the seeds—the plants are invested in protecting their progeny. Although it did not occur to me at the time, I later realized that humans, too, engage in a kind of tug-of-war with the food we eat, a battle in which we are measuring the spoils—calories—all wrong.
Almost every packaged food today features calorie counts in its label. Most of these counts are inaccurate because they are based on a system of averages that ignores the complexity of digestion.
Recent research reveals that how many calories we extract from food depends on which species we eat, how we prepare our food, which bacteria are in our gut and how much energy we use to digest different foods.
Current calorie counts do not consider any of these factors. Digestion is so intricate that even if we try to improve calorie counts, we will likely never make them perfectly accurate.
Aug 21, 2013
Dr. Krishna Kumari Challa
http://blogs.scientificamerican.com/image-of-the-week/2013/08/21/no...
No more right-brain/left-brain!
Aug 22, 2013
Dr. Krishna Kumari Challa
http://www.sciencenews.org/view/generic/id/352613/description/Bacte...
Bacteria can cause pain on their own
Microbes caused discomfort in mice by activating nervous system, not immune response
Aug 23, 2013
Dr. Krishna Kumari Challa
http://www.indiaeducationdiary.in/showEE.asp?newsid=25015
Bhartiya City presents Edinburgh International Science Festival in Bengaluru
Building on the overwhelming success of its other cultural activities where Bhartiya City had played host to Slayer, Santana and Guns ‘n Roses, it will now present the 26th Edinburgh International Science Festival - the most exciting science festival in the world in Bengaluru.
The 10 day long festival starting from August 30 will be a splendid affair to make Science fun, exciting and engaging for young minds. The Science Festival is a strategic initiative by Bhartiya City, committed to curating exceptional cultural programs to engage and inspire the country’s youth and promoting culture, science and technology. This was announced today by Mr Snehdeep Aggarwal, Chairman of Bhartiya Group, Dr Simon Gage, Director and CEO of EISF and Mr Ian Felton, Deputy High Commissioner of Britain to India in a press conference in Bengaluru.
The Festival expects around 50,000 visitors that include school children and their parents. The event is organized by Bhartiya City and co-presented by Discovery Kids, Powered by Horlicks Promind and in association with British Council, Art Konnect and mycity4kids.com
Aug 24, 2013
Dr. Krishna Kumari Challa
http://www.scientificamerican.com/article.cfm?id=just-thinking-abou...
Just Thinking about Science Triggers Moral Behavior
Psychologists find deep connection between scientific method and morality
Aug 28, 2013
Dr. Krishna Kumari Challa
Aug 29, 2013
Dr. Krishna Kumari Challa
http://www.asianscientist.com/health-medicine/shorter-working-hours...
Shorter Working Hours Do Not Guarantee Happier Workers
A reduction in working hours does not necessarily mean happier employees, according to a study of Korean workers
Aug 29, 2013
Dr. Krishna Kumari Challa
Aug 29, 2013