Professor of Theoretical Physics, CUNY. Pharyngula. Elaine Morgan says we evolved from aquatic apes. Electric fish diverging. Carl Hopkins Although these fish look alike and have the same DNA genetic makeup, they have very different electrical signals and will only mate with fish that produce the same signals.
Cornell researchers believe that these different electrical signals are the fishes' first step in diverging into separate species. Water has Memory. The Borg of the Microbes Takes Up . . . Farming? You are witnessing one of nature's most incredible migrations that never gets shown on the Discovery Channel.
Believe it or not, each one of those little dots is a solitary amoeba. But not for long. Note: This post contains a prize inside! Relativity of Electric and Magnetic Fields. Previous home next PDF Michael Fowler, University of Virginia A Magnetic Puzzle… Suppose we have an infinitely long straight wire, having a charge density of electrons of –λ coulombs per meter, all moving at speed v to the right (recall typical speeds are centimeters per minute) and a neutralizing fixed background of positive charge, also of course λ coulombs per meter.
The current in the wire has magnitude I = λv (and actually is flowing to the left, since the moving electrons carry negative charge). Crawling Neutrophil chasing bacterium (Fagocitando bacteria) Hot springs microbe yields record-breaking, heat-tolerant enzyme. American Museum of Natural History. PhysicsCentral: Learn How Your World Works. Africa111-2.jpg from lightgalleries.net. The mind-controlling infection that makes ants always bite at noon - io9. Quick evolution leads to quiet crickets. Resource library : Evo in the news : Quick evolution leads to quiet cricketsDecember 2006, updates added June 2008 and June 2011.
Exploratorium: the museum of science, art and human perception. SeenAndShared.com. The Carl Sagan Portal. THE ILLUSION OF REALITY. First habitable exoplanet confirmed. Joshua Klein on the intelligence of crows. The Big Chandra Picture. The Big Chandra Picture.
Symphony of Science. Beautiful Universe. Developmental Cell - Aberrant Epigenetic Landscape in Cancer: How Cellular Identity Goes Awry. Chromatin remodeling of interleukin-17 (IL-17)-IL-17F cytokine gene locus during inflammatory helper T cell differentiation.
Akimzhanov, A.M., Yang, X.O., and Dong, C. (2007) J. Biol. Chem. 282, 5969–5972. Epigenetics and the germline. Allegrucci, C., Thurston, A., Lucas, E., and Young, L. (2005) Reproduction 129, 137–149. Researchers discover molecular determinant of cell identity. Steve Fisch Howard Chang and his team have discovered how cells decide which proteins they will tend to produce.
If a big bunch of your brain cells suddenly went rogue and decided to become fat cells, it could cloud your decision-making capacity a bit. Fortunately, early in an organism’s development, cells make firm and more-or-less permanent decisions about whether they will live their lives as, say, skin cells, brain cells or, well, fat cells. Those decisions essentially boil down to which proteins, among all the possible candidates encoded in a cell’s genes, the cell will tend to make under ordinary circumstances.
But exactly how a cell chooses its default protein selections from an overwhelmingly diverse genetic menu is somewhat mysterious. A new study from the Stanford University School of Medicine may help solve the mystery. Howard Chang, MD, PhD, associate professor of dermatology, is the senior author of the study, published online March 20 in Nature. Dan Dennett: Cute, sexy, sweet, funny. HkWEf.jpg (3850×1925) Complicity and the Brain: Dynamics in Attractor Space. Dr.
Breakthrough of the Year: Bridging the Quantum and the Classical Worlds. Quantum mechanics lays out a set of mind-bending rules on how very small things move and behave, such as their ability to absorb energy only in discrete amounts (or quanta) and be in two different states at the same time.
Although, so far, quantum effects have been observed primarily in molecules, atoms, and subatomic particles, physicists have been putting much effort into observing quantum mechanics in systems closer to human scale. Such efforts are starting to pay off. Universcale. Nature by Numbers on Vimeo. Langton's ant. Langton's ant after 11000 steps.
A red pixel shows the ant's location. Langton's ant is a two-dimensional Turing machine with a very simple set of rules but complicated emergent behavior. It was invented by Chris Langton in 1986 and runs on a square lattice of black and white cells. The universality of Langton's ant was proven in 2000. The idea has been generalized in several different ways, such as turmites which add more colors and more states. Rules Animation of first 200 steps of Langton's ant Squares on a plane are colored variously either black or white. At a white square, turn 90° right, flip the color of the square, move forward one unitAt a black square, turn 90° left, flip the color of the square, move forward one unit Modes of behavior These simple rules lead to complex behavior.
Seawater Greenhouses Produce Tomatoes in the Desert. According to the World Health Organization, about 20 percent of the world’s people live in regions that don’t have enough water for their needs. With the global population increasing by 80 million each year, a third of the planet will likely face water shortages by 2025. This looming water crisis is inextricably linked to food production because agriculture accounts for 70 percent of all fresh water used, and obtaining irrigation water in arid regions has serious environmental impacts.
Drilling wells can deplete groundwater, and desalination is energy-intensive and leaves behind concentrated brine. The Seawater Greenhouse, however, provides what may be an economical and sustainable way of producing fresh water and crops in hot, dry regions near the ocean. Photo credit: World Bank Photo Collection. Natural selection. Natural selection Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin's grand idea of evolution by natural selection is relatively simple but often misunderstood.
Stephen Wolfram: Computing a theory of everything. 25 Awe-Inspiring Science Talks on TED. The natural world is an amazing thing, and despite the volumes upon volumes that we know about it, we’ve barely scratched the surface when it comes to truly understanding our universe and the things within it. Yet just because there’s so much information out there doesn’t mean you shouldn’t try to learn as much as you can about science. These lectures reflect information that’s at the cutting edge, from medical discoveries that could change lives to astrophysical research that’s expanding our knowledge of the worlds that lie beyond our own galaxy, and they can help you get an education in some of the greatest wonders the scientific fields have to offer.
Humans. Primates expect others to act rationally. Te map. Evo_large.gif (2420×915) Www.nowykurier.com/toys/gravity/gravity.html. WATERLIFE - NFB. Columbia Engineers Prove Graphene is Strongest Material. July 21, 2008. The strange case of solar flares and radioactive elements. Related images(click to enlarge) Nature by numbers. The theory behind this movie.
A Universe From Nothing' by Lawrence Krauss, AAI 2009. Water Drop @ 2000 Frames Bounces ! Great to watch BY TOSHNIDHI. Scientists may have found a new state of matter. First frictionless superfluid molecules created. Joking aside this is actually very interesting news. Quantum theory and physics in general is rather vague and sketchy at temperatures close to absolute zero. Amoebas show primitive farming behaviour as they travel. 19 January 2011Last updated at 19:00 By Jason Palmer Science and technology reporter, BBC News The amoeba is known to gather together in large "fruiting bodies" Curious Whales Check Out Photographers with Stunning Results.