Sentences with phrase «hydrogen bonding groups»

Not exact matches

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.

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.

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

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.

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).

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.

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.

P1 behavior was first investigated by STM at the liquid / solid interface: as an exemple, an arrangement of the molecules on HOPG presenting a quasi-square lattice (a = 2.1 nm, b = 2.2 nm, α = 94 °) self - assembled by hydrogen bonds between the pyridine unit and the methyl groups borne by the p - xylene core will be described, indicating strong intermolecular interactions between the molecules P1 leading to a supramolecular self - assembly independent of the underlying HOPG structure.

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.

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.

Antiparallel beta - sheet structure of the enzyme catalase: The antiparallel hydrogen bonds (dotted) are between peptide NH and CO groups on adjacent strands.

This figure also shows that all of the compounds identified possible form hydrogen bonds between the Glu66 residue and the carboxamide group.

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.

For example, the hydrogen bonding interaction between the phenolic — OH and the o - methoxy groups in curcumin influences the O - H bond energy and H atom abstraction by free radicals, thus making it a better scavenger of free radicals compared to other curcuminoids such as BDMC.

The K'NEX Model DNA, Replication and Transcription Kit includes phosphate groups, deoxy and ribose sugars and hydrogen bonds, allowing students to model the processes of replication and transcription with sturdy, colour - coded pieces.