Sentences with phrase «weak hydrogen bonds»

From supramolecular synthons to weak hydrogen bonds, Gautam Desiraju's research has impacted several areas of chemistry

They proved that the weak hydrogen bonds in water partially get their identity from stronger covalent bonds in the H2O molecule.

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.

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.

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.

His books on crystal engineering (Elsevier, 1989) and the weak hydrogen bond in structural chemistry and biology (OUP, 1999) are particularly well known.

He is noted for gaining acceptance for the theme of weak hydrogen bonding among chemists and crystallographers.

Reaching the high pressures required for the normally weaker hydrogen bonds to break water apart requires a very small sample.

Not exact matches

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

«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.

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.

In recent years researchers have achieved better performance with compounds such as lithium borohydride, in which the metal atoms form weaker, ionic bonds with groups containing several hydrogen atoms.

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

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 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.

It turns out that the answer 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.

In 2008, Ludwik Leibler, a chemist at the Industrial Physics and Chemistry Higher Educational Institution (ESPCI) in Paris, harnessed another (weaker) type of bonding — hydrogen bonding — to make a self - repairing rubber that heals itself when two broken sides are simply compressed together.

At that temperature, carbonate (a weak, non-hazardous base) can break the hydrogen - carbon bond.

The researchers compared the effect of two different substrates on the growth of the phosphorene nanoflake — a copper substrate, commonly used for growing graphene, which bonds with the phosphorene through strong chemical processes, and a hexagonal hydrogen boron nitride (h - BN) substrate that couples with the phosphorene via weak van der Waals bonds.

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.

The polymer and the agent form hydrogen bonds, weak electrostatic connections between polymer's hydrogen and an agent's oxygen atom.

Protein - protein complexes show good complementarity in surface shape and polarity and are stabilized largely by weak interactions, such as burial of hydrophobic surface, hydrogen bonds, and van der Waals forces.