News tagged with hydrogen bonds
WSU chemist applies Google software to webs of the molecular world
The technology that Google uses to analyze trillions of Web pages is being brought to bear on the way molecules are shaped and organized.
6 hours ago |
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New chemical reaction holds promise for drug development
A team of researchers at the California Institute of Technology (Caltech) has devised a new method for making complex molecules. The reaction they have come up with should enable chemists to synthesize new ...
Jan 12, 2012 |
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A good nose: Researchers decipher interaction of fragrances and olfactory receptors
Banana, mango or apricot - telling these smells apart is no problem for the human nose. How the olfactory organ distinguishes such similar smells has been uncovered by an interdisciplinary team of German researchers at the ...
Chemistry / Analytical Chemistry
Dec 13, 2011 |
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Two-step technique makes graphene suitable for organic chemistry
The future brightened for organic chemistry when researchers at Rice University found a highly controllable way to attach organic molecules to pristine graphene, making the miracle material suitable for a ...
Nanotechnology / Nanomaterials
Nov 29, 2011 |
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Research: Graphene grows better on certain copper crystals
New observations could improve industrial production of high-quality graphene, hastening the era of graphene-based consumer electronics, thanks to University of Illinois engineers.
Nanotechnology / Nanomaterials
Oct 27, 2011 |
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Study sheds light on the mysterious structure of water-air interface
Findings by Japanese researchers at the RIKEN Advanced Science Institute and their colleagues at Tohoku University and in the Netherlands have resolved a long-standing debate over the structure of water molecules ...
Oct 03, 2011 |
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Long-standing plant biochemistry mystery solved
Scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory and collaborators at the Karolinska Institute in Sweden have discovered how an enzyme "knows" where to insert a double bond ...
Sep 19, 2011 |
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Novel alloy could produce hydrogen fuel from sunlight
Scientists from the University of Kentucky and the University of Louisville have determined that an inexpensive semiconductor material can be "tweaked" to generate hydrogen from water using sunlight.
Aug 30, 2011 |
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Disorder is key to nanotube mystery
Scientists often find strange and unexpected things when they look at materials at the nanoscale -- the level of single atoms and molecules. This holds true even for the most common materials, such as water.
Nanotechnology / Nanomaterials
Aug 12, 2011 |
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Inexpensive catalyst that makes hydrogen gas 10 times faster than natural enzyme
Looking to nature for their muse, researchers have used a common protein to guide the design of a material that can make energy-storing hydrogen gas. The synthetic material works 10 times faster than the original ...
Aug 11, 2011 |
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Disease-causing tangle could spawn new materials
When most people hear the word amyloid, they immediately think of Alzheimer's disease. And indeed, it was in the brains of Alzheimer's patients that these dense protein masses were first identified. But it ...
Aug 01, 2011 |
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Chemists create molecular polyhedron
Chemists have created a molecular polyhedron, a ground-breaking assembly that has the potential to impact a range of industrial and consumer products, including magnetic and optical materials.
Jul 21, 2011 |
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New imaging tech promising for diagnosing cardiovascular disease, diabetes
Researchers have developed a new type of imaging technology to diagnose cardiovascular disease and other disorders by measuring ultrasound signals from molecules exposed to a fast-pulsing laser.
Jun 09, 2011 |
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Water molecules characterize the structure of DNA genetic material
Water molecules surround the genetic material DNA in a very specific way. German scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) have discovered that, on the one hand, the texture of this hydration ...
Apr 26, 2011 |
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The lock shapes the key: Mystery about recognition of unfolded proteins solved
Proteins normally recognize each other by their specific 3-D structure. If the key fits in the lock, a reaction can take place. However there are reactions at the onset of which the key does not really have a shape. German ...
Feb 15, 2011 |
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Hydrogen bond
A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, like nitrogen, oxygen or fluorine (thus the name "hydrogen bond", which must not be confused with a covalent bond to hydrogen). The hydrogen is covalently bonded to another electronegative atom. The energy of a hydrogen bond (typically 5 to 30 kJ/mole) is comparable to that of weak covalent bonds (155 kJ/mol), and a typical covalent bond is only 20 times stronger than an intermolecular hydrogen bond. These bonds can occur between molecules (intermolecularly), or within different parts of a single molecule (intramolecularly). The hydrogen bond is stronger than a van der Waals interaction, but weaker than covalent, or ionic bonds. This type of bond occurs in both inorganic molecules such as water and organic molecules such as DNA.
Intermolecular hydrogen bonding is responsible for the high boiling point of water (100 °C). This is because of the strong hydrogen bond, as opposed to other group 16 hydrides. Intramolecular hydrogen bonding is partly responsible for the secondary, tertiary, and quaternary structures of proteins and nucleic acids.
For more information about Hydrogen bond, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
