geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Evidence on the origin of impulses recorded from dentine in the cat


, : Evidence on the origin of impulses recorded from dentine in the cat. Journal of Physiology 243(3): 797-829

1. Recordings have been made from dentine at the tip of the canine teeth of cats using a large Ag/AgCl electrode.2. All-or-none action potentials with complex shapes were recorded when single nerve fibres from the dental pulp were stimulated electrically outside the tooth.3. The wave forms of these action potentials changed when the stimulation rate was increased from 1/sec to 10/sec, when the temperature of the tooth surface was changed between 17 and 42 degrees C, when the thickness of the dentine was reduced, and when local anaesthetic was applied to the dentine. Only a small, monophasic, positive potential remained after transection of the pulp in the crown of the tooth.4. The latency of the action potentials was not affected by these same procedures.5. It is suggested that each wave form represented a compound action potential produced by impulses invading the main branches and terminals of a single nerve in the pulp. Some of the terminals may have penetrated the innermost layers of the dentine.6. There was no spontaneous discharge from pulpal nerves.7. A discharge of impulses was recorded from dentine when 2.5 mol/l. NaCl was applied beneath the electrode at the tip of the tooth. By recording simultaneously from dentine and from single fibres from the tooth pulp, it was shown that impulses recorded from dentine were associated with propagated nerve action potentials.

US$19.90

PMID: 4449082

DOI: 10.1113/jphysiol.1974.sp010778


Other references

Hong, R.; Meenan, M.; Prince, E.; Murphy, R.; Tambussi, C.; Rohrbach, R.; Baumann, B.M., 2014: Comparison of three prehospital cervical spine protocols for missed injuries. We wanted to compare 3 existing emergency medical services (EMS) immobilization protocols: the Prehospital Trauma Life Support (PHTLS, mechanism-based); the Domeier protocol (parallels the National Emergency X-Radiography Utilization Study [NEXUS]...

Zerwekh, J.V., 1997: The practice of presencing. To understand philosophical foundations for this fundamental nursing intervention, and to review literature and expert nurses' experiences to describe how to be present to persons with cancer. Author's qualitative research of nurses&apos...

Cooney, M.J., 2011: Kinetic measurements for enzyme immobilization. Enzyme kinetics is the study of the chemical reactions that are catalyzed by enzymes, with a focus on their reaction rates. The study of an enzyme's kinetics considers the various stages of activity, reveals the catalytic mechanism of the enz...

Bosch, A.; Lucena, F.; Pares, R.; Jofre, J., 1983: Bacterial immuno stimulant broncho vaxom vs. levamisole on the humoral immune response in mice. A comparative study on the enhancement of the humoral immune response in mice after oral treatment with levamisole or a lyophilized bactericial lysate (Broncho-Vaxom) is presented. The latter provesto be more effective at therapeutic doses than le...

Björkbacka, H.; Johansson, I.M.; Skärfstad, E.; Forsman, C., 1997: The sulfhydryl groups of Cys 269 and Cys 272 are critical for the oligomeric state of chloroplast carbonic anhydrase from Pisum sativum. Chloroplast carbonic anhydrase is dependent on a reducing environment to retain its catalytic activity. To investigate the properties of the three accessible cysteine residues of pea carbonic anhydrase, mutants were made in which Ala or Ser substi...

Prellwitz, W.; Schmitt, K.F.; Machner, M.; Schuster, C.J.; Weilemann, L., 1982: Two automated methods for plasma antithrombin III compared, and the clinical significance of the results. Antithrombin III (AT III) activity was determined with two different new chromogenic substances--Chromozym-TH (Tos-Gly-Arg-p-nitroanilide; Boehringer Mannheim) and alpha-N-carbobenzyl-oxy-L-lysine-thiobenzyl ester (Du Pont)--with both a discrete (...

Burgess, F.W.; Pawasauskas, J., 2008: Methadone analgesia for persistent pain: safety and toxicity considerations. Medicine and Health, Rhode Island 91(9): 273-275

Banaszkiewicz, H., 1977: Epidemiology of dermatophyte infections in some occupational groups of workers at the Polish State Railways. In 539 railway employees examined for mycoses, interdigital mycoses and yeast infection of the feet were the most frequent forms of the disease. Trichophyton mentagrophytes var. interdigitale [T. interdigitale] and T. rubrum were isolated most fre...

Opare-Henaku, A.; Utsey, S.O., 2017: Culturally prescribed beliefs about mental illness among the Akan of Ghana. Mental illness is a culturally laden phenomenon, and different cultures have unique ways of constructing mental illness. In this study, conceptions of mental illness were explored among 30 participants of Akan descent in Ghana through individual a...

Meira, D.Dummer.; Nóbrega, I.; de Almeida, V.Hugo.; Mororó, Jânio.S.; Cardoso, A.M.; Silva, R.L.A.; Albano, R.M.; Ferreira, C.Gil., 2009: Different antiproliferative effects of matuzumab and cetuximab in A431 cells are associated with persistent activity of the MAPK pathway. Preclinical studies have shown the potential antitumour efficacy of monoclonal antibodies (MAbs) directed to the epidermal growth factor receptor (EGFR). In this report, we investigated the cytotoxic effects of the MAb matuzumab (EMD 72000) toward...