proton


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proton

 [pro´ton]
an elementary particle of mass number 1, with a positive charge equal to the negative charge of the electron; a constituent particle of every nucleus, the number of protons in the nucleus of each atom of a chemical element being indicated by its atomic number.

pro·ton (p),

(prō'ton),
The positively charged unit of the nuclear mass; protons form part (or in hydrogen 1 the whole) of the nucleus of the atom around which the negative electrons revolve.
[G. ntr. of prōtos, first]

proton

/pro·ton/ (pro´ton) an elementary particle that is the core or nucleus of an ordinary hydrogen atom of mass 1; the unit of positive electricity, being equivalent to the electron in charge and approximately to the hydrogen ion in mass. Symbol p.

proton

[prō′ton]
Etymology: Gk, protos, first
a positively charged particle that is a fundamental component of the nucleus of all atoms. The number of protons in the nucleus of an atom equals the atomic number of the element. Compare electron, neutron. See also atomic mass.

proton

A positively charged particle located in the nucleus of an atom of an element, the number of which governs its chemical properties.

pro·ton

(prō'ton)
The positively charged unit of the nuclear mass; protons form part (or in hydrogen 1, the whole) of the nucleus of the atom around which the negative electrons revolve.
[G. ntr. of prōtos, first]

proton

The positively-charged nucleus of a hydrogen atom. A hydrogen ion and the basis of acids.

proton,

n positively charged subatomic particle that is located in the nucleus of an atom. Its mass is equivalent to that of a neutron. The number of protons is equivalent to the atomic number.

pro·ton

(prō'ton)
The positively charged unit of the nuclear mass; protons form part (or in hydrogen 1, the whole) of the nucleus of the atom around which the negative electrons revolve.
[G. ntr. of prōtos, first]

proton (prō´ton),

n an elementary particle having a positive charge equivalent to the negative charge of the electron but possessing a mass approximately 1845 times as great; the proton is a nuclear particle, whereas the electron is extranuclear.

proton

an elementary particle of mass number 1, with a positive charge equal to the negative charge of the electron; a constituent particle of every nucleus, the number of protons in the nucleus of each atom of a chemical element being indicated by its atomic number.

proton pump
see sodium pump.
proton pump inhibitor
a class of therapeutic agents which are used to counteract the effects of proton pumps in tissues and organs, particularly used in counteracting gastric hypersecretion and acidity.
References in periodicals archive ?
Not only did approximately 99 percent of the patients surveyed believe they made the best treatment decision for themselves, but an almost equal number - almost 98 percent - reported that they had recommended proton therapy to others.
Professor Gordon McVie, chairman of Proton Partners International, said: "This is a milestone for cancer treatment in the UK.
Texas Center for Proton Therapy has implemented a powerful clinical tool in the fight against cancer and IBA is a proud partner in their effort to deliver advanced proton therapy treatment and improve the quality of life for cancer patients and their families in the Dallas-Fort Worth area.
It once held an 80 percent share in the domestic market, mainly due to the government imposing excessive taxes on foreign-made cars in order to give Proton a boost.
238(11) [13] from a measurement of electrons and protons in coincidence, which is the first determination to date.
The report, which is a result of comprehensive analysis of the market by RNCOS experts, clearly describes various aspects related to setting up a proton therapy center and also states the appropriate location for the same.
By creating this new system, we will be making an important and innovative step in improving how proton beam therapy is actually delivered to patients.
The estimation of the background of the random coincidence can be done using the background counting rate of the electron and proton detectors in similar experiments [6, 7].
Mevion has become a leading worldwide provider of proton therapy with more than dozen MEVION S250 proton therapy systems slated to be installed in the United States including five NCI Designated Comprehensive Cancer Center, and six international projects.
Mr Moran said: "The demand for proton beam therapy is on the rise and at least 10% of patients who receive traditional radiotherapy would actually be treated more effectively with protons.
A decay event is identified by a delayed coincidence between a fast electron (TOF[approximately equal to]10 ns) and a slow proton (TOF on the order of tens of microseconds).
titles, known as a coronal mass ejection, arrived near Earth about 36 hours after the proton barrage, treating Europeans to one of the brightest auroras in years.