Sentences with phrase «hydroxyl group»

«I'd say 99.9 percent of what turn out to be chemical estrogens have a phenolic hydroxyl group on the molecule, and any of those can bind to the estrogen receptor,» says Wade Welshons, a University of Missouri cell biologist and endocrinologist who has spent his career studying estrogen.

Fat soluble antioxidants such as vitamin E's and A's may help prevent lipid membrane oxidation and methoxylated flavonoids (flavonoids [plant antioxidants] with free hydroxyl groups are much more easily disposed of by the liver and kidneys and have trouble entering the brain, and usually have very little biological effect) may also prevent damage and prevent the toxic aggregation of amyloid beta peptides.

It is made of a group of polyols, organic compounds containing hydroxyl groups.

The aminoacyl acceptor stem and some additional 5» - and 3» - terminal sequences of a precursor transfer RNA are sufficient to allow efficient cleavage by RNAase P, and the 2» - hydroxyl group at the cleavage site is not absolutely necessary for cleavage.

Yingjie Zhang ran XPS experiments to provide direct proof that hydroxyl groups remain bonded to the surface.

The extra hydroxyl group found in the ribonucleotides is key to the ribose - seq technique, said Koh, the paper's first author.

Alternating layers of polymer and nanoparticles of silica (which have hydroxyl groups bound to their surface) form a superhydrophilic coating that can be applied to glass and other materials.

Specifically, a carboxylic acid ester has been added to the 17 - beta hydroxyl group.

Polysaccharides and glycans are made by the sequential addition of monosaccharides by glycosyltransferase from a reactive sugar - phosphate donor such as uridine diphosphate glucose (UDP - glucose) to an acceptor hydroxyl group on the growing polysaccharide.

Antioxidant activity of natural flavonoids is governed by number and location of their aromatic hydroxyl groups.

During synthesis, hydroxyl groups from the water stayed tightly bound to the lead oleate.

«Specifically, we now know that a free hydroxyl group is a key component for any FL118 analogs we develop, and we'll apply that finding as we move forward with subsequent studies.

Each unit of cellulose has three hydroxyl groups, which are chemically modified with a bromine atom.

Cyclodextrins are sugar molecules arranged in a ring such that the sugar's hydroxyl groups are perpendicular to the plane of the ring.

The excised intervening sequence retains the branch site and terminates in a guanosine residue with a 3» hydroxyl group.

Ribose - seq takes advantage of this reaction with the hydroxyl group to launch the process of identifying the genomic spectrum of ribonucleotide incorporation.

Compounds belonging to the terpenes group revealed tyrosinase inhibitory activities due to different aspects including the position and relative configuration of the hydroxyl groups as well as the nature and numbers of sugar units as in cycloartane glycosides.

In chemistry, alcohol is any organic compound in which a hydroxyl group -LRB-- OH) is bound to a carbon atom, which in turn is bound to other hydrogen and / or carbon atoms.

The natural enzyme has two zinc ions bridged by a hydroxyl group as the active catalytic site.

These latest findings, published in Molecular Pharmaceutics, a journal of the American Chemical Society, report on the structure - activity relationship (SAR) of the hydroxyl group within the agent's lactone ring.

I've been experimenting with T10 dextran coated iron oxide nanoparticles, obviously not the same as fullerenes, but still a very interesting tool, I've been testing if the coating is giving the particle antioxidant abilities because of it's the (basically) indigestable sugar chains (glucose) creating a high surface area which are largely made from hydroxyl groups, I hypothesised this act's as a «sink» for reactive oxygen species converting them to water.

Hydroxyl groups were included on the dcphOH - NDI linker to facilitate proton transport through the material.

The chemistry at work remains largely a mystery, Zhang said, but he suspects that metal chloride catalysts work during an atom - swapping phase that sugar molecules go through called mutarotation, in which an H (hydrogen) and OH (hydroxyl group) trade places.

The PNNL team ended the controversy by precisely measuring stability of water and its fragments; they found that molecular water is only 0.035 eV more stable than its dissociated counterparts (hydroxyl groups).

In the end, they determined that when the water fragmented to form two hydroxyl groups, the amount of energy needed to activate the bond that splits off the proton is relatively small, just 0.36 eV and the amount of energy to put the water back together is only 0.035 eV smaller, showing that water is only tiny bit more stable.

The molecules we have been working with all start with the same basic skeleton but we tweak them in different ways, so we make it a little bit bigger here, smaller there, we swap out a methyl group for a hydroxyl group.

Any chemical that contains a hydroxyl group, which is an oxygen atom bound to a hydrogen atom.

Fatty acids are long chains of carbon, with hydrogen's and a hydroxyl group.

It is an active agent for degradation of a number of toxins, before they can be either eliminated or further metabolized by the detox system; in addition, it also provides key chemical agents needed for detox reactions - oxygen, hydrogen and hydroxyl group.

As any of the hydroxyl groups on the ring of the substrate can be acceptors, the polysaccharides produced can have straight or branched structures.

Nutrients, both the vitamins and minerals as well as other compounds in foods (dubbed phytochemicals) can either be water soluble, fat soluble, or a blend of both (it depends on the polarity of the molecule and what the molecule is ringed with either methyl or hydroxyl groups).

Purified vegetable glycerin has a texture similar to an oil or syrup due to its organic molecular makeup, specifically, three hydroxyl groups.

Bottom: The new enzyme (green structure) can methylate the hydroxyl group, potentially interfering with lignin biosynthesis.

The hydroxyl groups (OH), shown in red, must remain unmodified for these precursors to link up.