Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements.

Diatomic elements played an important role in the elucidation of the concepts of element, atom, and molecule in the 19th century, because some of the most common elements, such as hydrogen, oxygen, and nitrogen, occur as diatomic molecules.

simple: Diatomic molecules

* Rotational Spectroscopy of Diatomic molecules, Brown and Carrington ;

* C < sub > 2 </ sub >, Diatomic carbon, a molecule made of two carbon atoms

Diatomic dications corresponding to stable neutral species ( e. g. H < sub > 2 </ sub >< sup > 2 +</ sup > formed by removal of two electrons from H < sub > 2 </ sub >) often decay quickly into two singly charged particles ( H < sup >+</ sup >), due to the loss of electrons in bonding molecular orbitals.

Diatomic gases are also almost exclusively diamagnetic, and not paramagnetic.

Diatomic oxygen gas constitutes 20. 8 % of the volume of air.

* Molecular Spectra and Molecular Structure: I. Spectra of Diatomic Molecules.

Constants of Diatomic Molecules, K. P. Huber and G. Herzberg, ( Van nostrand Reinhold company, New York, 1979, ISBN 0-442-23394-9 ).

His thesis was entitled Quantum Mechanics of the Formation of Certain Types of Diatomic Molecules.

Diatomic carbon can also be found under certain conditions.

* Herzberg, Spectra of Diatomic Molecules, Litton Educational Publishing, 1950, ISBN 0-442-03385-0, pp. 61ff and 66ff

It is based on the Neglect of Differential Diatomic Overlap integral approximation.

It is based on the Neglect of Differential Diatomic Overlap integral approximation.

It is based on the Neglect of Differential Diatomic Overlap integral approximation.

Although the fatty protein molecules, carried in the blood and partly composed of cholesterol, are water soluble, cholesterol itself is insoluble, and cannot be destroyed by the body.

In contrast, Biopharmaceuticals are large biological molecules such as proteins that are developed to address targets that cannot easily be addressed by small molecules.

It is used by all cells of the body because most substances important to them are large polar molecules that cannot pass through the hydrophobic plasma or cell membrane.

Transfer RNA molecules appear to have evolved prior to modern aminoacyl-tRNA synthetases, so the latter cannot be part of the explanation of its patterns.

Thus, any real object cannot remain the same, also because of movement of its physical parts ( even much bigger than molecules ).

When dissolving a lipophilic or amphiphilic substance in a polar environment, the polar molecules ( i. e., water in an aqueous solution ) become more ordered around the dissolved lipophilic substance, since the polar molecules cannot form hydrogen bonds to the lipophilic areas of the amphiphile.

Some metals form a barrier layer of oxide on their surface which cannot be penetrated by further oxygen molecules and thus retain their shiny appearance and good conductivity for many decades ( like aluminium, magnesium, some steels, and titanium ).

Single molecules cannot usually be observed by light ( as noted above ), but small molecules and even the outlines of individual atoms may be traced in some circumstances by use of an atomic force microscope.

The membrane alone has a hydrophobic core through which polar or charged molecules cannot diffuse.

Organic radiotracer molecules that will contain a positron-emitting radioisotope cannot be synthesized first and then the radioisotope prepared within them, because bombardment with a cyclotron to prepare the radioisotope destroys any organic carrier for it.

Theoretical aspects of rheology are the relation of the flow / deformation behaviour of material and its internal structure ( e. g., the orientation and elongation of polymer molecules ), and the flow / deformation behaviour of materials that cannot be described by classical fluid mechanics or elasticity.

For example, proteins and larger RNA molecules cannot be crystallized if their tertiary structure has been unfolded ; therefore, the range of crystallization conditions is restricted to solution conditions in which such molecules remain folded.

For example, reflection symmetries cannot be observed in chiral molecules ; thus, only 65 space groups of 230 possible are allowed for protein molecules which are almost always chiral.

the molecules flow as in a liquid, but they all point in the same direction ( within each domain ) and cannot rotate freely.

Despite the great strides in knowledge of these molecules and their role in bloodfeeding achieved recently, scientists still cannot ascribe functions to more than half of the molecules found in arthropod saliva.

Thus, the heat used to transform the working body of molecules from one state to the next cannot be used to do external work, e. g., to push the piston.

At high frequencies ( such as UV and above ), molecules cannot relax, and the energy is purely absorbed by atoms, exciting electron energy levels.

Large molecules cannot pass from the blood into the lumen of a seminiferous tubule due to the presence of tight junctions between adjacent Sertoli cells.

Although all molecules that have the property of immunogenicity also have the property of antigenicity, the reverse is not true.

We have to distinguish between the spectra of di-atomic molecules, which exhibit a pronounced fine structure, and those of larger ( usually tri-atomic ) molecules that don ’ t show such fine structure.

Gels made from purified agarose have a relatively large pore size, making them useful for separation of large molecules, such as proteins and protein complexes > 200 kilodaltons, as well as DNA fragments > 100 basepairs.

One property many proteins have is that they specifically bind to a certain molecule or class of molecules — they may be extremely selective in what they bind.

Some lipids are linear aliphatic molecules, while others have ring structures.

These cylindrical carbon molecules have unusual properties, which are valuable for nanotechnology, electronics, optics and other fields of materials science and technology.

In the upper atmosphere, chlorine-containing molecules such as chlorofluorocarbons have been implicated in ozone depletion.

A force field parameterized against a specific class of molecules, for instance proteins, would be expected to only have any relevance when describing other molecules of the same class.

These atomic orbitals are known to have specific angular relationships between each other, and thus the valence bond model can successfully predict the bond angles observed in simple molecules.

The majority of these non-protein molecules have a molecular mass of less than 300 Da.

This water of solvation is not active in osmosis and may have different solvent properties, so that some dissolved molecules are excluded, while others become concentrated.

In modern terms, we relate affinity to the phenomenon whereby certain atoms or molecules have the tendency to aggregate or bond.

For example, in the 1919 book Chemistry of Human Life physician George W. Carey states that, " Health depends on a proper amount of iron phosphate Fe < sub > 3 </ sub >( PO < sub > 4 </ sub >)< sub > 2 </ sub > in the blood, for the molecules of this salt have chemical affinity for oxygen and carry it to all parts of the organism.

Hundreds of diatomic molecules have been characterized in the terrestrial environment, laboratory, and interstellar medium.

Part of this rejection was due to the belief that atoms of one element would have no chemical affinity towards atoms of the same element, and part was due to apparent exceptions to Avogadro's law that were not explained until later in terms of dissociating molecules.

Contrary to brownian motion, which is the diffusion of a single particle, interactions between particles may have to be considered, unless the particles form an ideal mix with their solvent ( ideal mix conditions correspond to the case where the interactions between the solvent and particles are identical to the interactions between particles and the interactions between solvent molecules ; in this case, the particles do not interact when inside the solvent ).

As frequency increases into the visible range, photons of EMR have enough energy to change the bond structure of some individual molecules.

At higher frequencies ( visible and beyond ), the effects of individual photons of the radiation begin to become important, as these now have enough energy individually directly or indirectly to damage biological molecules.

The samples largely have to be viewed in vacuum, as the molecules that make up air would scatter the electrons.

Coated pits can concentrate large extracellular molecules that have different receptors responsible for the receptor-mediated endocytosis of ligands, e. g. low density lipoprotein, transferrin, growth factors, antibodies and many others.

Portions of a precursor RNA ( introns ) may be removed by cis-splicing or by having two or more precursor RNA molecules have ligated by trans-splicing.