Once reaching the cathode, the ions are reunited with the electrons and the two react with a third chemical, usually oxygen, to create water or carbon dioxide.

Once ignited and burnt, the combustion products — hot gases — have more available thermal energy than the original compressed fuel-air mixture ( which had higher chemical energy ).

Once the ore is mined, the metals must be extracted, usually by chemical or electrolytic reduction.

Once there, a series of chemical reactions ( the Sabatier reaction coupled with electrolysis ) would be used to combine a small amount of hydrogen ( 8 tons ) carried by the Earth Return Vehicle with the carbon dioxide of the Martian atmosphere to create up to 112 tonnes of methane and oxygen.

Once a T cell has recognized its particular antigen on the surface of an aberrant cell, the T cell becomes an activated effector cell, producing chemical mediators known as lymphokines that stimulate macrophages into a more aggressive form.

Once the heart stops, chemical changes occur within the body and result in changes in pH, causing cells to lose their structural integrity.

Once the mast cell-antibody-antigen complex is formed, a complex series of events that eventually leads to cell degranulation and the release of histamine ( and other chemical mediators ) from the mast cell or basophil occurs.

Once established, loosestrife stands are difficult and costly to remove by mechanical and chemical means.

Once in a country or state, the chemicals are diverted by rogue importers or chemical companies, by criminal organizations and individual violators, or acquired as a result of coercion on the part of drug traffickers.

Once these fats or oils are filtered from their hydrocarbons and then combined with alcohol like methanol, biodiesel is brought to life from this chemical reaction.

Once the oil is extracted additives are sometimes used to modify its chemical properties.

Once the chemical is identified, then the person can choose products that are not processed with that chemical.

Once a chemical is inside a body, it can be distributed to other areas of the body through diffusion or other biological processes.

Once all food chemical sensitivities are identified a dietitian can prescribe an appropriate diet for the individual to avoid foods with those chemicals.

Once there, she tells him they drink Chinese tea in bowls and then admonishes her husband for using the bowls for his chemical laboratory work, leaving residue.

Once the information is gathered and interpreted, NASS issues estimates and forecasts for crops and livestock and publishes reports on a variety of topics including production and supplies of food and fiber, prices paid and received by farmers, farm labor and wages, farm income and finances, and agricultural chemical use.

Once Welsh gold is purified, it is indistinguishable from other gold by the normal physical and chemical tests.

Once on the bottom of the sea, he sends the young officer back up to the boat, releases the destroyer, and cuts his own oxygen hose and lifeline, to ensure no one else will ever know the chemical composition of his horrid formula.

Once they're married, Bullmoose will kill Abner, and the formula will belong to his widow, Appassionata.

Once all variables have a clause of this form in the formula, a satisfying assignment of all of the variables may be generated by setting a variable to true if the formula contains the clause and setting it to false if the formula contains the clause.

Once a requirement is expressed as an LTL formula, a model checker can automatically verify this property against the model.

Once there, they don't find any formula and the Mall Rats consider going their separate ways.

Once time expires, a player's score is totaled using the following formula:

Once again the Mossberg Targo outfit has appeared, but this time as a bolt-action rifle-shotgun combination.

Once she has made up her mind, the queen starts out by constructing, in her chosen abode, a small `` floor '' of dried grass or some woolly material.

Once he has been identified, however, a new melody is used to accompany his narrative, a bleak motif with barren octaves creating a rather ancient effect:

Once again what has happened is an all-consuming confabulation of the incidentals, the accidents of painting.

Once a predator has sampled one of these, it is likely to remember the colouration next time it encounters a similar animal.

Once the screen has been cleared of all asteroids and flying saucers, a new set of large asteroids appears.

Once he has received this blessing, the abbot not only becomes father of his monks in a spiritual sense, but their major superior under canon law, and has the additional authority to confer the ministries of acolyte and lector ( formerly, he could confer the minor orders, which are not sacraments, that these ministries have replaced ).

Once a node has been found in a balanced tree, the next or previous nodes can be explored in amortized constant time.

Once it has come to rest, the jack is aligned to the centre of the rink and the players take turns to roll their bowls from the mat towards the jack and thereby build up the " head ".

Once the first bowl has taken place, the other side has the opportunity to bowl.

Once a beaver has sounded the alarm, nearby beavers will dive and may not reemerge for some time.

Once the expander has reached an acceptable size, it may be removed and replaced with a more permanent implant.

Once one copy of a document has been produced, printing further copies is often quicker by means of a device called a " thermoform ", which produces copies on soft plastic.

Once published by BSI a PAS has all the functionality of a British Standard for the purposes of creating schemes such as management systems and product benchmarks as well as codes of practice.

Once a prototype has passed the tests at a certification lab, and that model is being constructed under the control of a certified quality system, the device is entitled to bear a CE mark, indicating that the device is believed to be safe and reliable when used as directed.

Once an idea has been reduced to tangible form, for example by securing it in a fixed medium ( such as a drawing, sheet music, photograph, a videotape, or a computer file ), the copyright holder is entitled to enforce his or her exclusive rights.

Once the term of a copyright has expired, the formerly copyrighted work enters the public domain and may be freely used or exploited by anyone.

Once the software has loaded, the computer is able to execute the software.

Once this islands were covered with savanna on the plains and arid shrubland on the mountainsides, but over 500 years of human habtitation, since colonisation by the Portuguese in the 15th century, nearly all the original vegetation has been cleared by widespread agriculture including the grazing of goats, sheep and cattle and the planting of imported crop species.

Once labelled by Rolling Stone as " the most controversial woman in the history of rock ", Love's sometimes outrageous behavior has given her a lasting place in pop culture, as well as a polarizing reputation in the media.

Once the virus has infected the cell, it will start replicating itself, using the mechanisms of the infected host cell.

Once the desired change in values has been brought about, the victim is expected to conform spontaneously, without any need for further coercion.

Once the ray either encounters a light source, or more probably once a set limiting number of bounces has been evaluated, then the surface illumination at that final point is evaluated using techniques described above, and the changes along the way through the various bounces evaluated to estimate a value observed at the point of view.