A similarity in the sequence of restoration of the EEG spectrum between ground squirrels arousing from torpor and rats passing out of artificial hypothermia (17-18 degrees C) was shown. First of all, the low-frequency part of the EEG spectrum was restored. As animals warmed up, their breathing became hurried, cold shivering appeared, and the theta- and alpha-rhythms increased. During the exit from hypothermia, the activity of the protein-synthesizing system in both rats and ground squirrels was almost entirely restored when the animal body temperature achieved 21-22 degrees C. In ground squirrel, the rate of protein synthesis in the neocortex was lower than in hippocampus CA1 and CA3 areas, whereas in rats, on the contrary, it was higher in the neocortex in comparison with the CA3 area.
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Microsc Res Tech
January 2025
Department of Anatomy, Erciyes University Faculty of Veterinary Medicine, Kayseri, Türkiye.
In this study, the kidneys of ground squirrels (hibernated and nonhibernated), rabbits, and rats were examined macro and microanatomically. Kidney morphology was investigated by stereo microscopy, light microscopy, and scanning electron microscopy. Triple and immunohistochemical staining were performed for light microscopic examinations.
View Article and Find Full Text PDFEcol Lett
December 2024
Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France.
It has recently been recognised that populations are rarely in demographic equilibrium, but rather in a 'transient' state. To examine how transient dynamics influence our empirical understanding of the links between changes in demographic rates and population growth, we conducted a 32-year study of Columbian ground squirrels. The population increased rapidly for 10 years, followed by a 2-year crash, and a gradual 19-year recovery.
View Article and Find Full Text PDFComp Biochem Physiol A Mol Integr Physiol
December 2024
Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia; Department of Physiology and Pathology, Faculty of Basic Medicine, M.V. Lomonosov Moscow State University, Moscow, Russia.
Hibernation is accompanied by dramatic decrease of blood flow in many organs due to the increase of their vascular resistances. We compared the responses of mesenteric, renal, and cerebral proximal resistance arteries in summer active (SA) and winter hibernating (WH) ground squirrels and studied the signaling pathways of Rho-kinase and NO. Wire myography and Western blotting were used to assess the arterial responses and protein abundances.
View Article and Find Full Text PDFJ Med Entomol
December 2024
Department of Biology, San Francisco State University, San Francisco, CA, USA.
Pacific Coast tick fever is a recently described zoonotic disease in California caused by a spotted fever group rickettsia, Rickettsia rickettsii subsp. californica (formerly Rickettsia 364D) and transmitted by the Pacific Coast tick, Dermacentor occidentalis. Like many emerging vector-borne diseases, knowledge regarding the transmission cycle, contribution from potential amplifying hosts, and geographic distribution of R.
View Article and Find Full Text PDFInt J Mol Sci
November 2024
Department of Aerospace Physiology, Air Force Medical University, Xi'an 710032, China.
Hibernating mammals experience severe hemodynamic changes over the torpor-arousal cycle, with oxygen consumption reaching peaks during the early stage of torpor to re-enter arousal. Melatonin (MT) can improve mitochondrial function and reduce oxidative stress and inflammation. However, the regulatory mechanisms of MT action on the vascular protective function of hibernators are still unclear.
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