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First ever image taken of a single protein
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Proteins are subatomic biomolecules. They're produced by cells, so it's logical to assume that they are much tinier than cells, and of course, much tinier than the organelles that produce them. In a remarkable achievement, scientists have now obtained the first-ever photographs of single proteins. Using a "holography electron microscope," researchers tested on a range of protein samples, all just a few nanometers in size. Hemoglobin, the protein that transports oxygen in red blood cells, and cytochrome c, the protein that transfers electrons within the body, were just two examples. Source: arXiv ...
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8439 |
duddy |
8 years ago |
Coin shiver in dry ice!
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An American coin shivers in ice made from carbon dioxide (temperature below -78.5 degrees Celsius).
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8210 |
duddy |
9 years ago |
Nature's scuba divers
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Some bugs, such as water scorpions, long-toed water beetle and predaceous diving beetles (shown below) use the molecular properties of water to create miniature scuba diving tanks and spacesuits. The cohesive forces between water molecules essentially makes water molecules "stick" together, allowing bubbles to form against a wall of tension. These little insects are small enough to take advantage of this, by trapping a bubble in their outer wings or tiny bristles on their shell. ...
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8040 |
duddy |
8 years ago |
Proof that money does grow on trees
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Well, okay GOLD. Apparently, gold grows on eucalyptus trees. Researchers discovered that the trees are acting as a hydraulic pump, extracting gold from the soil and moving it to their leaves and branches. The ‘nuggets’ are about one-fifth the diameter of human hair, but the leaves may be used in combination with other tools to develop better exploration techniques.
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7624 |
duddy |
10 years ago |
Metal melts in your hand almost instantly
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Gallium is a silvery metal with atomic number 31. It is used in semiconductors and LEDs, but the cool thing about it is its melting point, which is only about 85 degrees Fahrenheit. If you hold a solid gallium crystal in your hand, your body heat will cause it to slowly melt into a silvery metallic puddle. Pour it into a dish, and it freezes back into a solid. While you probably should not lick your fingers after playing with it, gallium is not toxic and it will not make you crazy like mercury does. And if you get tired of it, you can melt it onto glass and make yourself a mirror. ...
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6915 |
duddy |
11 years ago |
The cotton castle
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Pamukkale, meaning "cotton castle" in Turkish, is a natural water terrace site located in the Denizli Province of southwestern Turkey. The site contains several hot springs contained by stark, white limestone deposits known as travertines, that are fed by the overflowing, mineral-rich spring waters. People have been bathing here for thousands of years. ...
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6171 |
duddy |
10 years ago |
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6026 |
duddy |
11 years ago |
Shape-shifting metal
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Ever seen 'memory metal' in action? Watch this paperclip - made from an incredible shape-shifting metal called Nitinol - be bent completely out of shape and then restored instantly as it touches a simple bowl of warm water.
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5977 |
duddy |
9 years ago |
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5913 |
duddy |
8 years ago |
Pearls dissolve in vinegar
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Since pearls are made mostly of calcium carbonate, the acid found in vinegar, known as acetic acid, will definitely dissolve one over a period of time. The same dissolution would occur if an egg were placed in a glass of vinegar and left to sit - the egg shell would disintegrate. Of course, the speed as which the pearl dissolves will depend on the concentration of the acid and the pearl's overall size. The reaction produces calcium acetate, water and carbon dioxide, summarized below: \(\mathrm{CaCO_3+2CH_3COOH\ →\ Ca(CH_3COO)_2+H_2O+CO_2}\) More Pearly Facts: Mollusks actually create pearls as a form of protection from foreign particles, sand and parasites. Natural pearls, though, are very rare in modern times due to a decline in mollusks ...
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5785 |
bio_man |
6 years ago |
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5757 |
duddy |
9 years ago |
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5738 |
duddy |
8 years ago |
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5200 |
duddy |
9 years ago |
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4821 |
duddy |
10 years ago |
So, chemistry is all theory, right?
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Using high-resolution atomic force microscopy, a hydrogen bond has been imaged for the first time. This technique is quite similar to the one used to photograph bonds breaking and reforming that was announced earlier this year.
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4730 |
savio |
10 years ago |