Sentences with phrase «for hydrogen atoms»

First manufactured in 1929 by substituting chlorine atoms for hydrogen atoms in hydrocarbon formulas, PCBs do not burn and are nearly indestructible, so they were perfect coolants, insulators, and hydraulic fluids.

The team succeeded by using deuteration, or the substitution of deuterium atoms for hydrogen atoms, to study how hydroxyl is produced.

They don't take the sugar compound from their placebo, randomly switch out one carbon atom for a hydrogen atom, run a split test, and hope for the best.

It may indeed be trivial for the hydrogen atom.

But the fact of the matter is that's not a useful statement because the Schrödinger equation is terrific for the hydrogen atom and pretty much useless for everything else.

However, after Anthony insisted that it could happen, I looked into the matter more deeply, and that was when I realized that the coding amino acid proline also has a carbon substitution for the hydrogen atom normally attached to the nitrogen atom, but has no trouble linking up with the other amino acids.

Not exact matches

Cosmic and biological evolution involve change in structures — as, for example, when electrons and protons form hydrogen atoms.

For example, what must be the nature of physical existents such that the composite, the molecule of water, not only consists of one oxygen atom and two hydrogen atoms, but that they are at a particular distance from each other and in a particular three - dimensional pattern?

Then again there are formulae which assert that there are entities in nature with such and such special properties, say, for example, with the properties of the atoms of hydrogen.

In an age of atom and hydrogen bombs — an age when the destruction of the whole world is possible — we are finally accepting the view that the church must take a clear stand for peace.

The question I now put and leave as a question for the moment is this: is anything else going on in the self - organization of snow flakes and the self - organization of hydrogen atoms that led to the universe and us?

Processing towards life is my metaphor for cosmic evolution from a relatively undifferentiated universe right after the big bang, for example a universe consisting of hydrogen atoms only.

For example, the presence of hydrogen and methane are clues that the chemical environment of the fluid in which the diamond crystallized was one in which the metal atoms could easily gain electrons and disengage from carbon atoms.

As for what they were doing, once the universe was cool enough to form hydrogen atoms, it was also cool enough for those elements to start interacting with each other and combining into molecules.

There are basically two types of lines, those produced by collisions between the atoms or ions and the electrons in the surrounding gas, which are called collision lines, and which are very bright for elements such as oxygen, nitrogen and neon, and lines which are produced when ions capture free electrons, which are called recombination lines, and which are bright only for those gases with the highest abundances in the interstellar medium: hydrogen and helium.

The components of water ice — hydrogen and oxygen atoms — have been around for much of the universe's history, but of course it's not water till they're combined.

In principle, the wave function, denoted by Greek letter psi, can be used to reveal these energy levels for any given atom or molecule, although in practice this has only been done for the very simplest — the hydrogen atom and molecule (made of two hydrogen atoms bonded together).

After all, particle accelerator searches over the last two decades had narrowed the range of possible masses for the Higgs; if it existed at all, it had to weigh in at between 114 billion and 143 billion electron volts or GeV (1 GeV is slightly more than the mass of a hydrogen atom).

«Because of the simplicity of the hydrogen atom, it acts as a benchmark for multi-electron atoms or molecules.»

(The unusual form of hydrogen let scientists correct results for oxygen atoms lost in H2O, for instance when the bear urinated.)

The «H» in HERA stands for hydrogen, and the instrument's antennas are tuned to detected a wavelength of light emitted by hydrogen atoms.

Graphene doped with nitrogen and augmented with cobalt atoms has proven to be an effective, durable catalyst for the production of hydrogen from water, according to scientists at Rice University.

Cobalt atoms shine in an electron microscope image of a new catalyst for hydrogen production invented at Rice University.

The scientists prepared the molecules so that the temperature — judged by the probability of an atom's nucleus being found in a higher energy state — was greater for the hydrogen nucleus than for the carbon.

For perspective, the diameter of a hydrogen atom is about 1.0 Angstroms.

Electrical engineers Joseph Lyding and Mark Hersam of the University of Illinois developed a technique for plucking single hydrogen atoms from a silicon sheet, which may lead to a millionfold increase in the number of transistors that can be packed onto a chip.

«We see clearly that hydrogen atoms start looking for something to react with,» says Räsänen.

This all changed with the first generation of stars, so bright and powerful that their light started to break apart hydrogen atoms around them, while their cores produced the elements essential for life itself.

For about 150 million years after the Big Bang, the Universe was a «dark» place, made of just hydrogen and helium atoms, as the first stars had yet to be formed.

Electron - rich aromatic molecules such as benzene can use their surplus of electrons to react with electron - poor, positively charged species, enabling benzene to exchange one of its hydrogen atoms for the electrophilic group to make a new, substituted benzene.

Instead of searching for the light from individual galaxies with an optical telescope, the team stalked a different quarry, red - shifted radio waves emitted by hydrogen atoms floating in huge clouds within the galaxies.

For example, in water (H2O) the sole oxygen atom is bound to two hydrogen atoms, and the two bonds constantly change in length.

For example, in our oceans, there is one deuterium atom to every 6420 hydrogen atoms.

In a 1931 article in The Strand Magazine entitled «Fifty Years Hence» 1, he described fusion power: «If the hydrogen atoms in a pound of water could be prevailed upon to combine together and form helium, they would suffice to drive a thousand - horsepower engine for a whole year.»

After decades of effort, physicists have probed the inner workings of atoms of antihydrogen — the antimatter version of hydrogen — by measuring for the first time a particular wavelength of light that they absorb.

After decades of effort, physicists have probed the inner working of atoms of antihydrogen — the antimatter version of hydrogen — by measuring for the first time a particular wavelength of light that they absorb.

On a yellow pad, Blackwell draws a portrait for me of a prototypical quorum - sensing signal molecule: a ring of carbon atoms attached to some hydrogen, nitrogen, and oxygen atoms, trailing off in a long tail composed of more carbon atoms.

PRMT stands for «protein arginine methyltransferase,» and PRMT enzymes facilitate the chemical process of arginine methylation, the fastening of a methyl group (made from one carbon and three hydrogen atoms) to proteins inside cells.

His team put radio collars on the animals, injected them with water with heavy hydrogen and oxygen atoms so these elements could be traced, recorded the animals» behaviors, and collected their feces to check for how fast those atoms were used, an indicator of metabolic rate.

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.

For example, questions such as «What happens to the rest of the bonds in a chain of carbon rings if you pinch a hydrogen atom off the end?»

The zinc atom is missing and a nitrogen atom (attached to a hydrogen atom) substitutes for the oxygen atom.

Odorants such as acetophenone and deuterated acetophenone, for example, have the same molecular structure; one is just built from a slightly heavier hydrogen atom, known as deuterium.

The details of this decay process are important because, for example, they help to explain the observed amounts of hydrogen and other light atoms created just after the Big Bang.

Water, for example, with one oxygen and two hydrogen atoms, can form two hydrogen bonds per molecule.

«This study highlights how neutrons are an unrivaled probe for identifying the location of hydrogen atoms in biological systems, providing us with an unprecedented level of structural detail for this important enzyme,» LADI - III beamline scientist Matthew Blakeley said.

In the early 2000s, Maria's group had pioneered the single - atom approach for metals anchored on oxide supports as the exclusive active sites for the water - gas shift reaction to upgrade hydrogen streams for fuel cell use.

«We found that even at temperatures as low as minus 300 degrees F these platinum atoms were capable of splitting hydrogen molecules into atoms, indicating that the platinum atoms would be very good at activating hydrogen for a chemical reaction,» Sykes said.

A study published in Proceedings of the National Academy of Sciences shows that a wax - like hydrocarbon — a chemical consisting of only carbon and hydrogen atoms called heneicosane — on the body surface of subterranean royal termites is used to enable worker termites to recognize and care for them.

While it has been understood for some time now that tRNAs are heavily decorated with small chemical groups such as methyls (carbon atoms bound to three hydrogens), the unprecedented discovery that one of these modifications can be removed suggests that tRNA has a regulatory role in the process of protein translation through chemical changes in itself.