Sentences with phrase «hydrogen bonded»

All of a sudden we have three hydrogen bonded water molecules.

And so it goes, the bigger the hydrogen bonded water cluster, the easier it is to form a bigger cluster.

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

In liquid water each molecule is hydrogen bonded to approximately 3.4 other water molecules.

In ice each each molecule is hydrogen bonded to 4 other molecules.

In the most common motif, created about 57 % of the time, hydroxide's oxygen atoms bonded with the hydrogen atoms on 4 water molecules while the hydroxide's hydrogen bonded to the oxygen atom on another water molecule.

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.

Hydrogen bonds only operate when the molecule includes an OH, NH, or HF (although molecules with an F - C component can be attracted with hydrogen bonding to an OH or NH).

Do they have enough ions running around to stick themselves together with hydrogen bonds?

While hydrogen bonds are not «the weak force» or even «a weak force,» they are weaker bonds than covalent bonds.

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

«Bond and bond alike: Unlikely hydrogen bond discovered.»

Previously, researchers assumed that positively charged hydrogen could only create hydrogen bonds with negatively charged elements like oxygen, fluorine and nitrogen.

BY AFFECTING the way molecules bind to each other, hydrogen bonds are responsible for water's high boiling point, ice's propensity to float and DNA's signature double helix.

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.

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.

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.

Now his team has shown that this allows hydrogen bonds to be imaged too.

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.

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.

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.

«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.

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.

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

These groups readily form hydrogen bonds that helped the fibers make tight contacts with one another, further strengthening the material.

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.

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.

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

On the atomic level, the layers are joined together by hydrogen bonds.

When the experiment was repeated using propanol — a larger alcohol with less hydrogen bonding in the mixture — optical distillation produced the same result as thermal distillation.

Water molecules move through the viscous supercooled water in jumps related to hydrogen bond breaking.

Their simulations allowed them to examine how the supercooled water hydrogen bonding network changed over time.

Rather, they assembled a variety of different polymer building blocks that carried different chemical functions, such as having an acidic appendage, an alkaline sidearm, or being able to create a network of weakly interacting hydrogen bonds.

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.

The components are held together by relatively weak and reversible interactions — e.g., hydrogen bonding and aromatic stacking.

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.

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.

These weak interactions, such as hydrogen bonds, van der Waals forces, and π - π interactions, govern the assembly of everything from DNA in its famous double helix to the bonding of H2O molecules in liquid water.

Water molecules in the solid state, such as in ice and snow, form weak bonds (called hydrogen bonds) to one another.

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

These bonds between molecules, which are called hydrogen bonds, dominate the properties of water and ice.

In a hair strand, the keratin molecules are mainly held together by two forces: chemical cross-links between cysteines (a type of amino acid) and weaker hydrogen bonds.

The hydrogen bonds can be disrupted by water vapor in the air, with each keratin binding to water in the air instead of each other.

The amalgamation of these techniques provided a fully characterized structure, one in which the dissolved carbon dioxide acts as a hydrophobe, having formed only very weak hydrogen bonds to the surrounding water molecules.

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

Herein we demonstrate that a photoredox - mediated hydrogen atom transfer protocol can efficiently and selectively install deuterium (D) and tritium (T) at α - amino sp3 carbon - hydrogen bonds in a single step, using isotopically labeled water (D2O or T2O) as the source of hydrogen isotope.

These are stabilised mainly by weak interactions — such as hydrogen bonds, intramolecular interactions, and inter molecular dispersive forces, — between the backbone and the lateral chain of their amino acids.

When the water is drained away Berglund found that the fibres join together into networks held by hydrogen bonds, forming flat sheets of «nanopaper».