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When does antimicrobial resistance increase bacterial fitness? Effects of dosing, social interactions, and frequency dependence on the benefits of AmpC -lactamases in broth, biofilms, and a gut infection model.
Evol Lett
August 2024
Department for Ecology and Conservation, University of Exeter, Penryn, United Kingdom.
One of the longstanding puzzles of antimicrobial resistance is why the frequency of resistance persists at intermediate levels. Theoretical explanations for the lack of fixation of resistance include cryptic costs of resistance or negative frequency-dependence but are seldom explored experimentally. -lactamases, which detoxify penicillin-related antibiotics, have well-characterized frequency-dependent dynamics driven by cheating and cooperation.
View Article and Find Full Text PDFMicromagnetic stimulation (MS) dose-response of the rat sciatic nerve.
J Neural Eng
May 2023
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, United States of America.
The objective of this study was to investigate the effects of micromagnetic stimuli strength and frequency from thenetic(MagPen) on the rat right sciatic nerve. The nerve's response was measured by recording muscle activity and movement of the right hind limb.The MagPen was custom-built to be stably held over the sciatic nerve.
View Article and Find Full Text PDFDose-Dependent, Frequency-Dependent, and Cumulative Effects on Cardiomyocyte Injury and Autophagy of 2.856 GHz and 1.5 GHz Microwave in Wistar Rats.
Biomed Environ Sci
April 2022
Department of Experimental Pathology, Beijing Institute of Radiation Medicine, Beijing 100850, China.
Abnormal Expression of Connexin43 in Cardiac Injury Induced by S-Band and X-Band Microwave Exposure in Rats.
J Immunol Res
March 2022
Beijing Institute of Radiation Medicine, Beijing 100850, China.
Although the effects of microwave exposure on the heart have gradually become the focus of domestic and foreign scholars, the biological effects caused by different doses and different frequency bands of exposure are still unclear. In this study, we will investigate the damaging effect of S-band and X-band microwave composite exposure on cardiac structure and function, as well as the pathophysiological significance of Cx43 in cardiac conduction dysfunction after exposure. We used S- and X-band radiation sources with the average power density of 5 and 10 mW/cm to expose Wistar rats to single or composite exposure.
View Article and Find Full Text PDFSimultaneous analyses of hemodynamic and electrophysiological effects of oseltamivir along with its pharmacokinetic profile using the canine paroxysmal atrial fibrillation model.
J Pharmacol Sci
January 2022
Department of Pharmacology, Faculty of Medicine, Toho University, 5-21-16 Omori-nishi, Ota-ku, Tokyo, 143-8540, Japan; Department of Aging Pharmacology, Faculty of Medicine, Toho University, 5-21-16 Omori-nishi, Ota-ku, Tokyo, 143-8540, Japan; Department of Inflammation & Pain Control Research, Faculty of Medicine, Toho University, 5-21-16 Omori-nishi, Ota-ku, Tokyo, 143-8540, Japan. Electronic address:
Since information of antiviral drug oseltamivir on the anti-atrial fibrillation (AF) property is still limited, we assessed it using the canine paroxysmal AF model. Oseltamivir in doses of 3 and 30 mg/kg/10 min was intravenously infused to the isoflurane-anesthetized, chronic atrioventricular block dogs (n = 6) with monitoring hemodynamic and electrophysiological variables, in which AF was induced by 10 s of burst pacing on atrial septum. Oseltamivir decreased AF incidence and AF duration, and prolonged AF cycle length in a dose-dependent manner.
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