Help


[permalink] [id link]
+
Page "Oxygen" ¶ 9
from Wikipedia
Edit
Promote Demote Fragment Fix

Some Related Sentences

Singlet and oxygen
Singlet oxygen is a very aggressive chemical species and will very rapidly react with any nearby biomolecules.
** Singlet oxygen reacts with biomolecules, fatally damaging some cells in the treatment area.
Singlet oxygen ( or < sup > 1 </ sup > O < sub > 2 </ sub >) is the common name used for an electronically excited state of molecular oxygen ( O < sub > 2 </ sub >), which is less stable than the normal triplet oxygen.
Singlet oxygen is in the same quantum state as most molecules and thus reacts readily with them, thus making singlet oxygen highly reactive.
Singlet oxygen is usually generated with a photosensitizer pigment.
Singlet oxygen can also be produced chemically.
Singlet oxygen reacts with an alkene-C = C-CH-by abstraction of the allylic proton in an ene reaction type reaction to the allyl hydroperoxide HO-O-R ( R = alkyl ), which can then be reduced to the allyl alcohol.
Singlet oxygen is the active species in photodynamic therapy.
* Singlet oxygen

Singlet and are
Singlet carbenes are spin-paired.

Singlet and .
Singlet and triplet energy levels.
Singlet and triplet carbenes exhibit divergent reactivity.
Singlet carbenes generally participate in cheletropic reactions as either electrophiles or nucleophiles.
Singlet carbenes with unfilled p-orbital should be electrophilic.

oxygen and is
Another effect discovered is the large coefficient of thermal diffusion tending to separate nitrogen from the oxygen when temperature differences straddling the nitrogen dissociation region are present.
The bond angles and distances are all within the expected limits and the volume per oxygen is about normal.
Hence it is difficult to conceive of a packing of the atoms in this material in which the oxygen atoms are far from geometrical equivalence.
If the Af bond is linear then there are three reasonable positions for the hydrogen atoms: ( 1 ) The hydrogen atoms are centered and hence all lie on a sheet midway between the oxygen sheets ; ;
( 2 ) all hydrogen atoms lie on a sheet, but the sheet is closer to one oxygen sheet than to the other ; ;
The rate of oxygen transfer at 1.0-mg. / l. dissolved oxygen concentration and 10-degrees-C for various rotor speeds is given in Table 3.
The polyethylene cover reduced the oxygen transfer rate by 10 per cent, indicating that the maximum oxygen transfer is at the rotor rather than through the surface.
In air, where oxygen is more concentrated, some small species can rely solely on cutaneous gas exchange, most famously the plethodontid salamanders, which have neither lungs nor gills.
The species that gains the electron pair is the Lewis acid ; for example, the oxygen atom in H < sub > 3 </ sub > O < sup >+</ sup > gains a pair of electrons when one of the H — O bonds is broken and the electrons shared in the bond become localized on oxygen.
Argon has approximately the same solubility in water as oxygen and is 2. 5 times more soluble in water than nitrogen.
Argon is isolated from air by fractionation, most commonly by cryogenic fractional distillation, a process that also produces purified nitrogen, oxygen, neon, krypton and xenon.
Antimony is stable in air at room temperature, but reacts with oxygen if heated to form antimony trioxide, Sb < sub > 2 </ sub > O < sub > 3 </ sub >.
In these compounds, at least one carbon atom is replaced by one of the heteroatoms oxygen, nitrogen, or sulfur.
This is seen in, for example, phenol ( C < sub > 6 </ sub > H < sub > 5 </ sub >- OH ), which is acidic at the hydroxyl ( OH ), since a charge on this oxygen ( alkoxide-O < sup >–</ sup >) is partially delocalized into the benzene ring.
* William Gibson's Sprawl trilogy features various arcologies, namely the " projects ", which is a megastructure constructed with electricity, heat, oxygen, and food that it produced.
All snails in the family Planorbidae have the red oxygen transport pigment haemoglobin, but this is especially apparent in albino animals.
Well-funded groups like Canada's Ballard Power Systems are also working to develop a " regenerative fuel cell ", a device that can generate hydrogen and oxygen when power is available, and combine these efficiently when power is needed.

oxygen and name
Despite the name, an oxidation reaction does not necessarily need to involve oxygen.
The genus name is derived from the Ancient Greek, kryptos ( hidden ) and branchos ( gill ); a reference to oxygen absorption primarily through gills that are in a covered chamber and not lungs.
Its name derives from the Greek roots ὀξύς ( oxys ) (" acid ", literally " sharp ", referring to the sour taste of acids ) and-γόνος (- gοnos ) (" producer ", literally " begetter "), because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition.
The name oxygen was coined in 1777 by Antoine Lavoisier, whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion.
* Oxy is a slang name for oxygen acetylene welding
The first form of elemental phosphorus to be produced ( white phosphorus, in 1669 ) emits a faint glow upon exposure to oxygen – hence its name given from Greek mythology, meaning " light-bearer " ( Latin Lucifer ), referring to the " Morning Star ", the planet Venus.
Joseph Priestley, for example, in referring to the reaction of steam on iron, whilst fully acknowledging that the iron gains weight as it binds with oxygen to form a calx, iron oxide, iron also loses “ the basis of inflammable air ( hydrogen ), and this is the substance or principle, to which we give the name phlogiston .” Following Lavoisier ’ s description of oxygen as the oxidizing principle ( hence the name oxygen: oxus
In the 2223 structure, Cu has two coordinations with respect to oxygen: one Cu atom is bonded with four oxygen atoms in square planar configuration and another Cu atom is coordinated with five oxygen atoms in a pyramidal arrangement .< ref name =" WR ">
Stainless steel does not readily corrode, rust or stain with water as ordinary steel does, but despite the name it is not fully stain-proof, most notably under low oxygen, high salinity, or poor circulation environments.
They are carbohydrates and as this name implies, are composed of carbon, hydrogen and oxygen.
Ways to check carburetor mixture adjustment include: measuring the carbon monoxide, hydrocarbon, and oxygen content of the exhaust using a gas analyzer, or directly viewing the colour of the flame in the combustion chamber through a special glass-bodied spark plug sold under the name " Colortune "; the flame colour of stoichiometric burning is described as a " bunsen blue ", turning to yellow if the mixture is rich and whitish-blue if too lean.
Hemoglobin is sometimes referred to as the oxygen transport protein, in order to contrast it with its stationary cousin myoglobin, although its function and mechanism are more complex than this name would suggest.
In vertebrates, they are called a Rete mirabile, originally the name of an organ in fish gills for absorbing oxygen from the water.
The term oxime dates back to the 19th century, a portmanteau of the words oxygen and imide .< ref > The name " oxime " is derived from " oximide " ( i. e., oxy-+ amide ).
In 1962, Neil Bartlett discovered that a mixture of platinum hexafluoride gas and oxygen formed a red solid .< ref name =" bartlett "> The red solid turned out to be dioxygenyl hexafluoroplatinate, O < sub > 2 </ sub >< sup >+</ sup >< sup >−</ sup >.
As the name implies, these anoxygenic phototrophs do not produce oxygen as a byproduct of photosynthesis, in contrast to oxygenic phototrophs such as cyanobacteria, algae, and higher plants.

0.364 seconds.