Sentences with phrase «of hydrogen bonded»

These properties allow a spatial resolution on the sub-molecular scale allowing to visualize the bonding structure of a hydrogen bonded molecular network.

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.

Amino acids known to regulate receptor function are linked through packing interactions and a network of hydrogen bonds, suggesting a conformational pathway from the ligand - binding pocket to regions that interact with G proteins.

You report on the redefinition by the International Union of Pure and Applied Chemistry (IUPAC) of hydrogen bond participants to...

Researchers can now study how water behaves when stripped of the hydrogen bonds that normally govern its properties, as well as the molecule's two different «spin» states, which can not be separated when water molecules are en masse.

Individually they are weak, together they form the cement that holds together a whole new family of designer materials sings the praises of hydrogen bonds

The tetrahedrality of water is a consequence of hydrogen bonds between molecules, which are constrained to fixed directions.

But chemists at the University of Copenhagen have discovered a new kind of hydrogen bond that, at first glance, should be impossible: It's composed of two positively charged atoms, one phosphorus and one hydrogen.

These intermolecular connections, consisting of hydrogen bonds, give the smaller molecules the stretchiness of much longer molecular chains.

DNA's twisted ladder structure requires rungs of hydrogen bonds to hold it together; each bond is essentially made up of a single hydrogen atom that unites two molecules.

This work predated our understanding of hydrogen bonding!

We report on the use of the hydrogen bond acceptor properties of some phosphorus - containing functional groups for the assembly of a series of [2] rotaxanes.

The dotted lines represent distances for the formation of hydrogen bonds.

X-ray crystallography revealed that the isothiourea moiety was making an extended network of hydrogen bonds with functional groups that were key to BACE1's catalytic activity.

The enzyme, Tang's team reports, resembles the video - game character «Pac - Man,» with two bowl - shaped halves joined by a hinge at one end and held closed, most of the time, by a latch of hydrogen bonds on the other end.

The saturation of the hydrogen bonds made this much more stable chemically than the polyunsaturates.

Initially, all the molecules are bashing each other and pairs of hydrogen bonding water molecules are broken before they are hit by a third slowly moving water molecule.

The increased intensity of the hydrogen bonding of ice accentuated by higher CO2 atmospheric content.»»

Learning Probabilistic Models of Hydrogen Bond Stability from Molecular Dynamics Simulation Trajectories

Not exact matches

Methane — a compound made up of one carbon atom bonded to four of hydrogen — is, according to the Intergovernmental Panel on Climate Change, 25 times as potent as carbon dioxide.

If the amount of matter converted were slightly smaller — 0.6 % instead of 0.7 % — a proton could not bond to a neutron, and the universe would consist only of hydrogen.

Their composition is largely dependent on hydrogen atoms in the molecules, and the ability of these to create hydrogen bonds with other elements.

Disks cool down more efficiently if their gas includes some molecular hydrogen — two hydrogen atoms bonded together — rather than atomic hydrogen, which consists of only one atom.

Nevertheless, a team from the University of Copenhagen's Department of Chemistry has managed to become the first to bond positively charged phosphorus atoms with positively charged hydrogen ones.

The diamond - like structural unit consists of six - sided rings of carbon atoms bonded together in chains surrounded by a halo of hydrogen atoms.

They are also all saturated fats, chains of single - bonded carbon atoms with hydrogen atoms neatly lined up on either side of each carbon.

In principle, the wave function, denoted by Greek letter psi, can be used to reveal these energy levels for any given atom or molecule, although in practice this has only been done for the very simplest — the hydrogen atom and molecule (made of two hydrogen atoms bonded together).

Another major advantage the catalysts have is that, while they are general in what substrate they can oxidize, they are very specific about which carbon - hydrogen bonds they cut — so much so that they target a certain spot on amino acids like proline, leucine or valine even when they are part of a much larger peptide chain.

Hydrogen atoms contained in water readily bond with the heavy isotope to form hydrochloric acid gas, which then leaks into space — leaving more of the lighter isotope behind.

When the team applied the technique to a sample of the organic molecule PTCDA, not only did the molecules show up in intricate detail, an electrical signal was also detected between them (coloured green below), at exactly the locations where hydrogen bonds are present (Journal of the American Chemical Society, DOI: 10.1021 / ja104332t).

Water, via hydrogen bonds, interacts with the walls of the artificial channels.

Dr Russo said: «With this procedure, we have found that what makes water behave anomalously is the presence of a particular arrangement of the water's molecules, such as the tetrahedral arrangement, where a water molecule is hydrogen - bonded to four molecules located on the vertices of a tetrahedron.

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.

A main advantage to the catalysts, which oxidize bonds between carbon and hydrogen, is that they preserve the amino acid's sense of chirality.

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.

VHTR plants could even produce hydrogen for fuel using high - temperature steam electrolysis, which breaks apart the bonds of water molecules; this process is 50 percent more energy - efficient than existing hydrogen production methods.

The rays do this by causing molecules in the ring known as amide groups to shuffle from opposite sides of the carbon bond to the same side, loosening hydrogen bonds in the process.

For complex reasons involving the atomic bonding properties of hydrogen, that configuration isn't conducive to electrolysis.

Complex organic molecules, consisting of carbon bonded with other elements like oxygen and hydrogen, are common in the Milky Way, but it was uncertain whether they would be produced in certain dwarf galaxies like the neighboring Large Magellanic Cloud.

«Previous research used reversible hydrogen bonds to connect polymers to form a rubber but reversible bonds are intrinsically weaker than covalent bonds,» said Li - Heng Cai, a postdoctoral fellow at SEAS and corresponding author of the paper.

About four billion years ago, the strength of those hydrogen - carbon bonds allowed increasingly complex molecules — amino acids, DNA, and proteins — to form from the primordial soup, making life possible.

In the double - helix configuration, two strands of DNA are joined to each other by hydrogen bonds in an arrangement known as base pairing.

Free radicals attack weak carbon - hydrogen bonds and are a major source of the kind of oxidative cell damage that can occur in conditions such as coronary artery disease, neurological disorders and retinal ailments.

Water molecules are linked together by hydrogen bonds that break and form several thousands of billions of times per second.

Ethylene (or IUPAC name ethene) is the simplest alkene hydrocarbon, consisting of four hydrogen atoms and two carbon atoms connected by a double bond.

In aqueous fluids, amino acid residues that have polar sidechains — components that can have a charge under certain physiological conditions or that participate in hydrogen bonding — tend to be located on the surface of the protein where they can interact with water, which has negatively and positively side charges to its molecule.

The zirconium sapped the loyalty of the electrons bonding the nitrogen pairs, weakening the link between the two atoms and letting hydrogen weasel in and latch onto the nitrogen.

He has spent his career focused on just one bond, a link between a carbon and a hydrogen atom in a molecule of methane, the main component of natural gas.

«That's what his advance is pointing towards,» he says, «finding an alternative catalyst that will allow us to do oxygen evolution (breaking the bonds of water or H2O and forming oxygen) in concert with hydrogen» on a grand scale.

Instead of a hydrophilic alcohol group (an oxygen - hydrogen molecule bound to a hydrogen - saturated carbon atom), the final lignin polymer contained a hydrophobic aldehyde group (a carbon atom double - bonded to an oxygen atom).