Sentences with phrase «hydrogen bonds with»

The polymer can readily form hydrogen bonds with water.

For instance, Schoenmann explains, microscopic particulates in the air will form hydrogen bonds with a painting's surface so that «no amount of water or scrubbing will be able to remove that dirt.

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 chromophore establishes hydrogen bonds with water molecules and side chains of the adjacent amino acids as well as van der Waals contacts, all of which influence its fluorescent properties.

The hydrogen bonds with carbon to form methane.

First, the water molecules around the hydroxide ion bounced around, positioning and creating hydrogen bonds with the hydroxide.

Melanie Sanford, a chemist the University of Michigan, Ann Arbor, who focuses on using metal - based agents, primarily palladium, to catalyze reactions that substitute hydrogen in carbon - hydrogen bonds with other atoms or functional groups.

When ethanol dissolves in water, the ethanol molecules remain intact but form new hydrogen bonds with the water.

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

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

After careful analysis, the research team determined that an ammonia molecule forms a nearly linear hydrogen bond with another ammonia molecule and that additional hydrogen bonds with another ammonia molecules do not perturb this pattern.

Meanwhile, Christner says, unraveling the chemistry of ice - binding proteins (which tend to form a hydrogen bond with water molecules) could have important biotech applications.

Not exact matches

Cats give birth to kittens, not woodchucks, oxygen bonds with hydrogen to make water and not alcohol.

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 OHHydrogen 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 OHhydrogen bonding to an OH or NH).

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

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.

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

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.

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.

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.

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.

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.

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

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.

They make good fuels because the energy stored in the bonds between carbon and hydrogen is abundant and easy to release in combustion with oxygen.

First, the chemists release the hydrogen from its bonds with carbon by mixing methane with oxygen, throwing in a catalyst, and turning up the heat.

«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.

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.

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.

Atoms of most elements, such as hydrogen, oxygen and carbon, form tight chemical bonds by sharing electrons with their neighbours in order to give each atom a stable configuration of electrons.

The researchers discovered that these catalysts — copper in the form of a white salt and the ligand as an oil — can oxidize C - H bonds in a very efficient way in combination with hydrogen peroxide, a reduced form of oxygen that nature uses.

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.

Scientists from Tomsk Polytechnic University together with their colleagues from USA and Japan have proposed a novel way to address the most important and fundamental challenge of organic chemistry, i.e. breaking a bond between carbon and hydrogen atoms to form new organic substances.

So researchers are looking for materials that can stabilise hydrogen by weakly bonding with it.

Working at the ESRF in Grenoble, France, they bombarded ice with powerful x-rays and studied the scattering patterns when the x-ray photons ricocheted off the electrons in the hydrogen bonds.

As the water boiled away, the hydrogen escaped into interstellar space while the oxygen came back down and bonded with carbon atoms.

Also, the pressure exerted on the water is so high that hydrogen bond interactions with the graphene surface are overcome by the attractive van der Waals atomic interaction that draws together the graphene planes.

When combined with hydrogen peroxide, TAMLs neutralize many contaminants by breaking their chemical bonds.

These bonds complement existing interactions such as conventional hydrogen bonds or the more recent chalcogen bonds with sulfur.

Under normal conditions, the contact — or bond — used is with hydrogen.

This fact, along with the computer simulation, suggests that the mechanical force provided by actin can restructure CPEB into a longer fiber with new hydrogen bonds between the coils.

Two features make this polymer ultrastrong, Sachleben told Live Science: Its molecules, or «beads,» are strongly attracted to one another; and hydrogen bonds — the same bonds found in DNA, as well as water molecules — keep the «beaded strings» tightly interlocked with their neighboring beaded strings, Sachleben said.

For example, instead of stealing an electron from double - bonded carbons or a nearby propagating chain, the carbon atom with the free radical sometimes steals an entire hydrogen atom from another chain end.

«Water could be the most abundant source of hydrogen if one could separate the hydrogen from its strong bond with oxygen in the water by using a catalyst.»

The high energy content of the hydrogen molecule meets with a particularly stable bonding situation.

First, they occurred quickly and the resulting nucleotides spontaneously paired with each other in water, forming hydrogen bonds like the Watson - Crick base pairs that create the «ladder - rung» pattern inside RNA and DNA helixes.

The geometrical structures and hydrogen - bond tunneling pathways of the water trimer, tetramer, pentamer, and hexamer systems have recently been characterized with global analysis of potential surfaces, diffusion Monte Carlo calculations, and far - infrared laser vibration - rotation tunneling spectroscopy.

«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.»