Sentences with phrase «isomers of»

Several cis isomers of lycopene were detected but not quantified.

This does not mean that all the trans fatty acids are in themselves harmless, but that any harmful effect is limited and balanced by the beneficial effects of, for example, trans isomers of conjugated linoleic acid (CLA) which are health - promoting with specific roles to play in our bodies.

There are about 3000 isomers of Vitamin D. Cod liver oil does indeed contain many of the natural forms of D2, and these are converted in the body into various needed forms of D.

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.

«Isolation of Two Agostic Isomers of an Organometallic Cation: Different Structures and Colors.»

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

If the vitamin A activity of cis isomers of β - carotene is estimated to be one - half that of β - carotene, the total vitamin A activity would be ≈ 426 μg RE (≈ 213 RAE) in a serving of Indian spinach and ≈ 415 μg RE (≈ 208 RAE) in a serving of sweet potatoes.

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.

It directly produces the L - isomer of Carnitine, the form found in nature.

Herzon and his colleagues discovered they could prepare an isomer of pleuromutilin — a compound that has the same connectivity, but with a different arrangement of atoms — and rearrange it in the final steps of the synthesis to pleuromutilin.

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.

These are simulated crystal structures of virgin - DEB and T4H - DEB (chemically known as 1,4 - distyrylbenzene, a trans - isomer of DEB intermediate product after the capture of first 4 atomic hydrogen with 2 CH bonds on opposing sides of the carbon chain).

Glucosepane contains a rare isomer of imidazole, which has never before been observed in natural molecules, other than those in the glucosepane family.

It is trans isomer of oleic acid and can be found in some meats and vegetable oils.

Not exact matches

But the atomic structures of the clusters fluctuated under the heat treatment, switching back and forth between two main atom - configurations («isomers»): these were a face - centred cubic structure, similar to a small piece of bulk gold, and a decahedral arrangement with a symmetry forbidden in an extended crystal.

Moreover, these isomers have better antibacterial properties than pleuromutilin itself, opening the door to the preparation of improved compounds.

For example, only the right - handed form of glucose gives you energy — the left - handed isomer can not be metabolized, even though it tastes the same.

«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.

«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.»

Water molecules can exist as one of two isomers, depending on how the spins of their two hydrogen atoms are orientated: ortho, where the nuclear spins are parallel to one another, and para, where the spins are antiparallel.

The research team now plans to study the roles of isomer concentrations and temperature in the conversion process, the conversion of para-water to ortho («back conversion»), how to detect single ortho - and para-water molecules on surfaces, and spin isomers in other fullerene - caged molecules.

By trapping water molecules in carbon spheres and cooling them, scientists at the universities of Southampton, Nottingham and Columbia University in New York, have been able to follow the change in form (or isomer) of the molecules.

«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.

E-strain females make mostly the E isomer with traces of the Z isomer, which is highly attractive to E-strain males.

Mirror - image isomers (enantiomers) can have substantially different biological properties, so the selective synthesis of just one enantiomer is desirable.

These so - called partially modified retro - inverso - isomers are new, potent, topochemical analogs of the enkephalins.

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.

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

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).

«Most tomato lycopene that we eat exists as the all - trans isomer, a rigid and straight form, but in the bodies of regular tomato consumers, most lycopene exists as cis isomers, which tend to be bent and flexible.

The isomers differ in the position of a nitrogen - hydrogen bond in respect to the nickel center.

Testing for anti-HIV activity showed that the cis analogue 76a (anti-HIV IC50 = 35 nM), comparable with bicyclic tetrahydroquinoline derivative 75, was the most potent among the isomers, while the activities of the cis isomer 76b and both trans diastereomers 76c and 76d were more than 10-fold lower.

These nitrogen - containing ligands twist into three different isomers, which are different arrangements of the same atoms.

Comparative Toxicity and Metabolism of N - Acyl Homologues of Acetaminophen and Its Isomer 3 ′ - Hydroxyacetanilide.

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

Disappointments with outcomes - based studies investigating α - tocopherol are, in large part, the result of abstracting this single compound from the vitamin E family and ignoring the interplay among the eight isomers that constitute natural vitamin E. Best clinical outcomes will be achieved with vitamin E supplementation providing mixed tocopherols and tocotrienols in ratios similar to those found in nature.

Part II of this article reviews recent research on both the unique and interactive nature of the vitamin E isomers» therapeutic actions, and the ratios in which the tocopherols and tocotrienols have been found to be most bioavailable and effective.

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.

Current research investigating the potential therapeutic actions of the other vitamin E isomers, however, clearly indicates that these compounds both potentiate and balance the actions of α - tocopherol, which, in high doses, might otherwise be detrimental.

In other research, additional vitamin E isomers have also been found to inhibit COX -2-catalyzed formation of PGE2, e.g., in one study, δ - tocopherol was an even stronger COX - 2 inhibitor than γ - tocopherol.

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.

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

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

«The impact of feeding practices becomes even more evident in light of recent reports from Canada which suggests a shift in the predominate trans C18: 1 isomer in grain - fed beef.

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»

[10] Effect of lactic acid isomers on keratinocyte ceramide synthesis, stratum corneum lipid levels and stratum corneum barrier function.

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

The lessons cover a variety of topics such as atomic structure, quantum mechanics, atomic size, bonding, crystals, isomers, rates of reaction, and many more.

Topics include: States of matter Diffusion Atomic Structure Separation Techniques Covalent Bonding Ionic Bonding Metallic Bonding Oxygen and Oxides Acids, Alkalis and Salts Rates of Reaction Equilibrium Energetics Organic Chemistry - alkanes, alkenes, alcohols, isomers, fractional distillation, cracking, polymerisation Chemistry in industry - Haber Process, Contact process, Extraction of Metals

Cypermethrin, including the resolved isomer alpha - cypermethrin, dichlorovinyl derivative of pyrethrin