WordNet

everlastingly; for all time; "rays...streaming perpetually from the sun"- Stuart Chase
a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years
motion that continues indefinitely without any external source of energy; impossible in practice because of friction
a warrant with no expiration date

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/03/23 08:57:59」(JST)

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Metastasis-associated protein 1 (MTA1) signaling in rheumatoid synovium: Regulation of inflammatory response and cytokine-mediated production of prostaglandin E2 (PGE2).

Wang H1, Dong BW2, Zheng ZH3, Wu ZB3, Li W4, Ding J5.
Biochemical and biophysical research communications.Biochem Biophys Res Commun.2016 Mar 9. pii: S0006-291X(16)30340-0. doi: 10.1016/j.bbrc.2016.03.027. [Epub ahead of print]
Abnormal perpetual inflammatory response and sequential cytokine-induced prostaglandin E2 (PGE2) play important roles in the pathogenesis of rheumatoid arthritis (RA). The underlying regulatory mechanism, however, remain largely unknown. Here, we discovered that expression level of Metastasis associ
PMID 26970310

Gholap H1, Warule S2, Sangshetti J3, Kulkarni G4, Banpurkar A4, Satpute S4, Patil R5.
Applied microbiology and biotechnology.Appl Microbiol Biotechnol.2016 Mar 8. [Epub ahead of print]
The perpetual use of antibiotics against pathogens inadvertently altered their genes that have translated into an unprecedented resistance in microorganisms in the twenty-first century. Many researchers have formulated bactericidal and bacteriostatic inorganic nanoparticle-based antiseptics that may
PMID 26952109

Rowberry MD1, Martí X2, Frontera C3, Van De Wiel MJ4, Briestenský M5.
Journal of environmental radioactivity.J Environ Radioact.2016 Mar 4;157:16-26. doi: 10.1016/j.jenvrad.2016.02.023. [Epub ahead of print]
Cave radon concentration measurements reflect the outcome of a perpetual competition which pitches flux against ventilation and radioactive decay. The mass balance equations used to model changes in radon concentration through time routinely treat flux as a constant. This mathematical simplification
PMID 26950394