Sentences with word «isomer»

The vitamin A activity of cis isomers of β - carotene was not included in the determination of portion sizes because of uncertainty about the bioavailability of cis - β - carotene relative to all - trans - β - carotene.

Dugan et al (2007) reported that the major trans isomer in beef produced from a 73 % barley grain diet is 10t - 18:1 (2.13 % of total lipid) rather than 11t - 18:1 (TVA)(0.77 % of total lipid), a finding that is not particularly favorable considering the data that would support a negative impact of 10t - 18:1 on LDL cholesterol and CVD»

In addition to their antioxidant actions within LDL and HDL cholesterol, the vitamin E isomers reside in lipid bilayers where they not only act as antioxidants, but affect cell signaling, membrane - resident enzymes and other membrane - dependent processes.

The mean all - trans - β - carotene concentration in cooked sweet potatoes was 28.3 ± 1.3 μg / g, and the mean concentration of cis isomers of β - carotene was ≈ 6.0 ± 0.3 μg / g (≈ 17 % of total β - carotene); lutein was not detected in sweet potatoes.

Identification, quantitative determination, and antioxidative activities of chlorogenic acid isomers in prune (Prunus domestica L.).

Suntheanine ® is protected by several U.S. and international patents for its various physiological efficacies and L - isomer specific production processes.

They probed the mirror - image isomers of camphor with circularly polarized light, which revealed the angle - dependent delays between trajectories that spanned up to 24 attoseconds.

Conjugated linoelic acid isn't just one substance, but a family of about 20 different strains called isomers.

Unfortunately, if the target compound is chiral, this substitution produces left - and right - handed isomers in equal amounts.

«As the observed NMR signal is proportional to the amount of ortho - water in the sample (para-water «NMR silent»), we can track the percentages of ortho and para isomers at any time and any temperature,» Mamone explained.

«Currently, mechanisms for this conversion are not completely understood, nor how long it takes the molecules to transform from one spin isomer to the other,» said Salvatore Mamone, a post-doctoral physicist at the University of Southampton and lead author on the JCP paper.

Researchers led by Ludwig - Maximilians - Universitaet (LMU) in Munich physicists Peter Thirolf, Lars von der Wense and Benedict Seiferle have now experimentally identified a long - sought excitation state, a nuclear isomer in an isotope of the element thorium (Th), which could enhance this level of accuracy by a factor of about ten.

The results may explain how primitive life could have developed a preference for one optical isomer of a molecule over its mirror image.

The team set out to see how the protons move on the catalyst's ligands between each of the different isomers.

The theoreticians determined the barriers that kept the catalyst in the less - productive isomer forms.

Isolation of Two Agostic Isomers of an Organometallic Cation: Different Structures and Colors, Angewandte Chemie.

Our Thyro - Protect Vitamin E Complex contains a high concentration of the complete Vitamin E tocopherol complex — HIGH - Gamma, HIGH - Alpha, with Beta and Delta isomers.

Effects of conjugated linoleic acid isomers on monocyte, macrophage and foam cell phenotype in atherosclerosis.

The calculations agreed very well with our experiments and disagreed with all the other isomers,» said Osborn.

Too much of the inactive isomer will result in hypothyroid symptoms.

Since our bodies are unable to use this fructose isomer for energy it is transformed into triglycerides (fat).

The cost alone to change my diet isomer thing but can't afford a food processor as well.

It consists of eight naturally occurring isomers, a family of four tocopherols (alpha, beta, gamma and delta) and four tocotrienols (alpha, beta, gamma and delta) homologues.

Essential fatty acids and their trans geometrical isomers in powdered and liquid infant formulas sold in Canada.

The theory was that hitting a small amount of a radioactive isomer of the super-expensive metal hafnium with X-rays would release this torrent of energy.

Therefore, chemists working on complex molecules have developed a variety of tricks to guarantee isomer purity.

«Because the molecules are kept separate by the cages, there is a large rotational freedom that makes observation of the ortho and para isomers possible.»

The Interstellar Chemistry of C3H and C3H2 Isomers.

During the 2006 Tour de France, Floyd Landis's ratio of testosterone to epitestosterone (an inactive steroid isomer of testosterone), the so - called T / E ratio, was higher than 4 to 1, the limit considered by the World Anti-Doping Agency (WADA) as proof of steroid use.

«Using a microchannel plate detector, we were then able to measure the decay of the excited isomer back to the ground state of Th - 229 as a clear and unambiguous signal.

In acid, four PBGs join up to give four possible uro» gen isomers, but mostly type III.

So the most abundant isomer was probably genetically «fixed», copied biosynthetically, and its structure gradually improved.

However, direct detection of the thorium isomer Th - 229m has never been achieved.

Enols are less stable isomers, or chemical variants, of known molecules that are produced in fire's many chemical transformations.

So the team then used another magnetic resonance technique which showed them which isomers were produced by the fungus (Journal of the American Chemical Society, vol 116, p 12097).

Interestingly, when the β - linkage isomer of the synthesized methyl - glucuronosyl galactose disaccharide was added to the culture, the pollen tube was attracted to the attractant molecule.

The team suspects the catalyst could be 10 times faster if it would avoid the two distracting isomers.

The remarkable anti-HIV activity of the racemic mixture necessitated the synthesis of single enantiomers to identify the active isomer.

The paper «Experimental determination of the energy difference between competing isomers of deposited, size - selected gold nanoclusters», by D.M. Foster, R. Ferrando and R.E. Palmer, is published in Nature Communications, volume 9, page 1323 (2018) and is available open access.

Most trans - isomer fats (commonly called trans fats) are commercially produced rather than naturally occurring.

The cis - isomer introduces a kink into the molecule that prevents the fats from stacking efficiently as in the case of fats with saturated chains.

* Methylated folate as Quatrefolic ® natural 6S isomer to help support a healthy methylation cycle.

All natural vitamin E compounds have antioxidant activity, but evolution has tasked this 8 - isomer family of inter-related tocopherols and tocotrienols with significantly more than just serving as chain - breaking inhibitors of lipid peroxidation.

CEHCs are as effective as their vitamin E isomer precursors in producing these anti-proliferative effects, which have been shown to occur through inhibition of cyclin signaling with subsequent arrest of the cell cycle.26 γ - CEHC may also have blood pressure - lowering effects as it has been shown to be a natriuretic factor that promotes sodium excretion and contributes to the regulation of the extracellular fluid volume.27 19

The pentoses in hemicellulose are usually D - sugar isomers, but it may contain some L - sugars.

The effects of specific TFA isomers require further investigation.

Vaccenic acid and trans fatty acid isomers from partially hydrogenated oil both adversely affect LDL cholesterol: a double - blind, randomized controlled trial.