Sentences with phrase «hydrogen bonding»
Hydrogen bonding is a special type of attraction that happens between hydrogen and another atom in a molecule. It occurs when hydrogen is bonded to a highly electronegative atom such as oxygen, nitrogen, or fluorine. These bonds are responsible for many important properties of water and other molecules, like their ability to stick together and form liquids. Full definition
As simple as an individual water molecule is — two atoms of hydrogen bonded with one of oxygen — it forms weak bonds to its neighbors creating more - complex structures.
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The polymer can readily form hydrogen bonds with water.
On the atomic level, the layers are joined together by hydrogen bonds.
The shapes are the result of hydrogen bonds between the ions and the molecules.
These groups readily form hydrogen bonds that helped the fibers make tight contacts with one another, further strengthening the material.
Their composition is largely dependent on hydrogen atoms in the molecules, and the ability of these to create hydrogen bonds with other elements.
These bonds between molecules, which are called hydrogen bonds, dominate the properties of water and ice.
Thus, molecules that are able to form lots of hydrogen bonds among themselves are much harder to turn into a gas and have a higher heat of evaporation.
What's next: With this joint research completed, the scientists plan to apply their techniques and experience to address other challenges in the area of hydrogen bonded clusters.
The findings will allow investigators to improve theories of water and the many biological structures such as DNA which possess hydrogen bonds.
Some of these changes allow us to draw conclusions about hydrogen bonding with neighbouring molecules.
They occur between a metal and a distant carbon - hydrogen bond along some chain, folding the chain back to the metal and pinning it there.
Instead, remote mutations change interactions such as salt bridges and hydrogen bonds significantly over the evolutionary pathways.
Your style will stay in place until these temporary hydrogen bonds are broken by moisture leaving or entering the hair shaft.
These protein crystals are held together by hydrogen bonds, one of the weakest chemical bonds, and have an important role in defining the mechanical properties of silk.
Some of these forces are hydrogen bonds between side chains of specific amino acids.
The secret of floating ice has long been known: a phenomenon we call hydrogen bonds.
When carbon dioxide gas entered the mix, the gas molecules broke hydrogen bonds in the water molecules, making the ice more brittle.
The gas molecules seemed drawn to the tip of the crack; to get there, they flipped along the surface like zombie gymnasts, leaving broken hydrogen bonds in their wake.
They proved that the weak hydrogen bonds in water partially get their identity from stronger covalent bonds in the H2O molecule.
The key, it seems, lies in the interaction between the bonds that hold the atoms in the water molecule together and the much weaker bonds, known as hydrogen bonds, that are the glue holding groups of water molecules together.
Organic chemist David Leigh of the University of Edinburgh, U.K., and colleagues had previously discovered that they could slow the spin of rotaxane rotors 1000-fold with oscillating electric fields, which apparently polarize and strengthen the weak hydrogen bonds holding a ring to its thread.
Their simulations allowed them to examine how the supercooled water hydrogen bonding network changed over time.
In water, the molecules jostle around, continually breaking and making hydrogen bonds — although according to a theoretical model developed last year by Sydney Benson and Eleanor Siebert of the University of Southern California, Los Angeles, they like to form short - lived networks...
It is fully implemented with Leontis and Westhof's (RNA (2001) 7, 499 - 512), convention for the edge - to - edge hydrogen bonding interactions.
Unlike other healable materials that use hydrogen bonds, boron nitride nanosheets are impermeable to moisture.
It turned out that the negative compressibility of sodium amidoborane crystals has to be a consequence of the elongation of the chemical bonds between nitrogen and hydrogen and boron and nitrogen, caused by the abrupt formation of new hydrogen bonds between adjacent molecules in the crystal.
Your hair style is created by wetting and drying your hair, which sets hydrogen bonds into a desired shape.
«Cheap, energy - efficient and clean reaction to make chemical feedstock: Combining experimental and computer chemistry, scientists find the conditions to break carbon - hydrogen bonds at low temperature with cheap titanium in place of rare metals.»
Since the mid-1980s, scientists have argued whether or not an ammonia molecule forms a linear hydrogen bond with another ammonia molecule or it is involved in a more complex arrangement.
White's group is working on catalysts that can modify a wider range of amino acids, particularly those with electron - rich aromatic functionality, which compete with the carbon - hydrogen bonds for oxidation using the current catalyst.
They may also help nanotechnologists design more advanced self - assembling materials, many of which rely heavily on hydrogen bonds to put themselves together correctly.
The scientists were now able for the first time to empirically observe how the acetone molecules linked tightly to the chloroform molecules via hydrogen bonding.
It seems likely that the highly localised heating on the surface of nanoparticles somehow disrupts hydrogen bonding within the ethanol — water mixture, allowing greater separation of ethanol from water molecules at higher concentrations of ethanol.
They then analysed the nature of intramolecular forces in each amino acid using bonding types like hydrogen bonds.
Pauling's idea was that electron waves on the sigma and hydrogen bonding sites would overlap somewhat so these electrons would become indistinguishable.
«The key is to tune the shape of the template to create a subtle bias towards the targeted carbon hydrogen bond,» said Yu.
Water, for example, with one oxygen and two hydrogen atoms, can form two hydrogen bonds per molecule.
Among the areas of research that inspire Dr. Cui are: the development of new technologies to further the development of electric transportation; creating new battery chemistry for grid - scale storage at ultra-low cost; and harnessing low - cost technologies for the development of catalysts for efficient carbon dioxide reduction and conversion into highly valuable products and inert carbon - hydrogen bond activation.
Whereas the first is explained by H - bond with the proteins, the retarded hydrogen bond dynamics around hydrophobic residues is at first glance surprising and can be explained by the additional imposed steric constraints on the water molecules at hydrophobic sites.
Bullock and postdoctoral chemist Edwin van der Eide knew an agostic bond in their catalyst would help protect the reactive metal from working at the wrong time: The carbon - hydrogen bond blocks the reactive metal until conditions are right, which in turn would help the scientists better control the catalytic reactions.
The results suggested that the tertiary amine groups bind to D97 on TM2 and E32 in the amino terminus of CXCR4 through hydrogen bonds while aromatic residues Y45, W94, H113 and Y255 establish hydrophobic interactions with the aromatic counterpart of identified compounds.
For example, on the rhodium catalysts, the team's calculations showed that the carbon - carbon and carbon - hydrogen bond scissions are competitive, regardless of the rhodium particle size.
«Bond and bond alike: Unlikely hydrogen bond discovered.»
Weaker hydrogen bonds enable the ring in the structure on the right to spin up to a million times faster than in the structure on the left.