When this rule is broken, giving the " molecule " a charge, the result is sometimes named a molecular ion or a polyatomic ion.

When applied to the simplest two-electron molecule, H < sub > 2 </ sub >, valence bond theory, even at the simplest Heitler-London approach, gives a much closer approximation to the bond energy, and it provides a much more accurate representation of the behavior of the electrons as chemical bonds are formed and broken.

When cells enter mitosis, the sister chromatids ( which represent the two copies of each chromosomal DNA molecule resulting from DNA replication earlier in the cell cycle and packaged by histones and other proteins into chromatin ) are linked all along their length by the action of the cohesin complex.

When an electron in an excited molecule or atom descends to a lower energy level, it emits a photon of light equal to the energy difference.

When oxygen is not bound, a very weakly bonded water molecule fills the site, forming a distorted octahedron.

When red cells reach the end of their life due to aging or defects, they are broken down in spleen, the hemoglobin molecule is broken up and the iron gets recycled.

When trying to define rigorously whether an arrangement of atoms is " sufficiently stable " to be considered a molecule, IUPAC suggests that it " must correspond to a depression on the potential energy surface that is deep enough to confine at least one vibrational state ".

When proteins bind specifically to other copies of the same molecule, they can oligomerize to form fibrils ; this process occurs often in structural proteins that consist of globular monomers that self-associate to form rigid fibers.

When the functional group attacking the peptide bond is a thiol, hydroxyl or amine, the resulting molecule may be called a cyclol or, more specifically, a thiacyclol, an oxacyclol or an azacyclol, respectively.

When a chlorophyll molecule at the core of the photosystem II reaction center obtains sufficient excitation energy from the adjacent antenna pigments, an electron is transferred to the primary electron-acceptor molecule, pheophytin, through a process called photoinduced charge separation.

When a ribosome finishes reading an mRNA molecule, these two subunits split apart.

When a molecule absorbs a quantum of energy that corresponds to a transition from one molecular orbital to another molecular orbital, the resulting electronic excited state is also properly described as an exciton.

When one water molecule is lost another is pulled along by the processes of cohesion and adhesion.

When the activation energy is given in molecular units instead of molar units, e. g., joules per molecule instead of joules per mole, the Boltzmann constant is used instead of the gas constant.

When the molecule relaxes it emits a photon and it returns to a different rotational or vibrational state.

When glycogen stores are not available in the cells, fat ( triacylglycerol ) is cleaved to provide 3 fatty acid chains and 1 glycerol molecule in a process known as lipolysis.

When meat is in its raw state, the iron atom is in the + 2 oxidation state, and is bound to a dioxygen molecule ( O < sub > 2 </ sub >).

When this small molecule is water, it is known as a dehydration reaction ; other possible small molecules lost are hydrogen chloride, methanol, or acetic acid.

When the UV photon strikes a phosphor molecule, it momentarily raises the energy level of an outer orbit electron in the phosphor molecule, moving the electron from a stable to an unstable state ; the electron then sheds the excess energy as a photon at a lower energy level than UV light ; the lower energy photons are mostly in the infrared range but about 40 % are in the visible light range.

When a molecule absorbs a photon, it increases the energy of the molecule.

When several minutes had passed and Curt hadn't emerged from the livery stable, Brenner reentered the hotel and faced Summers across the counter.

When they had licked the last of the wieners' taste from their fingers, they settled back, and Cappy offered Ernie a cigarette.

When, in 1832, the South Carolina nullifiers adopted the principle of state interposition which Madison had advanced in his old Virginia Resolve, they elicited no encouragement from that senior statesman.

When he discovered they had received from the Company's Court of Directors no permission to live in India, coupled with the fact that they were Americans who had been sent to Asia to convert `` the heathen '', he became more belligerent than ever.

When Thompson and her daughter began a correspondence which included fervent verses from Pantasaph, Mrs. King felt a proper Victorian alarm.

When he came home from his office at the end of the afternoon, Breasted never knew what gathering he should expect to find, but there almost always was one.

When Blackman emerged from the bedroom, everyone was gone except the tolerant Lord Thomson, who stayed and chatted with him for half an hour, and then Blackman lay awake most of that night, despairing of what he must expect on the Continent.

There is, of course, nothing new about dystopias, for they belong to a literary tradition which, including also the closely related satiric utopias, stretches from at least as far back as the eighteenth century and Swift's Gulliver's Travels to the twentieth century and Zamiatin's We, Capek's War With The Newts, Huxley's Brave New World, E. M. Forster's `` The Machine Stops '', C. S. Lewis's That Hideous Strength, and Orwell's Nineteen Eighty-Four, and which in science fiction is represented before the present deluge as early as Wells's trilogy, The Time Machine, `` A Story Of The Days To Come '', and When The Sleeper Wakes, and as recently as Jack Williamson's `` With Folded Hands '' ( 1947 ), the classic story of men replaced by their own robots.

Sir -- When the colonies decided upon freedom from England, we insisted, through the Declaration of Independence, that the nations of the world recognize us as a separate political entity.

When East Germans fled to the West by the thousands, paeans of joy rose from the throats of Western publicists.

When the parents emerged from the bedroom a few minutes later, the maid greeted them quietly.

When Kate hurried in alarm to tell him to put it out, she saw other dots of flames among the western Virginia hills from the few scattered fires of the faithful.

When the fate of the individual is visited on the group, then ( the warm sweet butter dripped from her raised trembling fork and she pushed her head forward belligerently ), ah, then the true bitterness of existence could be tasted.

Speaking from long years of experience, Mrs. Long advised the Juniors: `` When showing dogs ceases to be fun and excitement, stop!!

When more than two figures are separated by subtraction symbols the subtraction must be carried out from the left to right if the result is to be correct.

When changing from one color to another, whether working on right or wrong side, pick up the new strand from underneath dropped strand.

`` When working from one of my sketches I square it up and project its linear form freehand to the watercolor sheet with charcoal.

When did you last compare your present premium costs with the costs of insurance from other sources??

When the larvae hatch, they feed on the beebread, although they also receive extra honey meals from their mother.

When necessary, we should make it clear that countries which choose to derive marginal advantages from the cold war or to exploit their potential for disrupting the security of the world will not only lose our sympathy but also risk their own prospects for orderly development.

When an occurrence Af is isolated during text reading, a random memory address Af, the address of a cell in the X-region, is computed from the form of Af.

When this situation exists, the address Af will equal Af which was produced from Af.

When entries are being retrieved from this file, the table of dictionary usage indicates which entries to skip and which entries to store in the computer.

When the snobbery that alienates Pip from Joe finally gives way before the deeper and stronger force of love, the reunion is marked by an embarrassed handshake at which Pip exclaims: `` No, don't wipe it off -- for God's sake, give me your blackened hand ''!!