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Artykuły w czasopismach na temat "Frogs – Physiology"

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Smotherman, M. S., and P. M. Narins. "Hair cells, hearing and hopping: a field guide to hair cell physiology in the frog." Journal of Experimental Biology 203, no. 15 (August 1, 2000): 2237–46. http://dx.doi.org/10.1242/jeb.203.15.2237.

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For more than four decades, hearing in frogs has been an important source of information for those interested in auditory neuroscience, neuroethology and the evolution of hearing. Individual features of the frog auditory system can be found represented in one or many of the other vertebrate classes, but collectively the frog inner ear represents a cornucopia of evolutionary experiments in acoustic signal processing. The mechano-sensitive hair cell, as the focal point of transduction, figures critically in the encoding of acoustic information in the afferent auditory nerve. In this review, we p
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McCAY, MICHAEL G. "AERODYNAMIC STABILITY AND MANEUVERABILITY OF THE GLIDING FROG POLYPEDATES DENNYSI." Journal of Experimental Biology 204, no. 16 (August 15, 2001): 2817–26. http://dx.doi.org/10.1242/jeb.204.16.2817.

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SUMMARY Gliding has evolved independently in two families of tree frog. Tree frogs glide to descend rapidly to mating sites over temporary pools on the forest floor or to escape predators. The physical mechanisms used by frogs to glide and maneuver were investigated using a combination of observations of live frogs (Polypedates dennysi) gliding in a tilted wind-tunnel and aerodynamic forces and torques measured from physical models of tree frogs in a wind-tunnel. Tree frogs maneuvered in the tilted wind-tunnel using two different turning mechanisms: a banked turn (the frog rolls into the turn)
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Shirokova, N., J. García, G. Pizarro, and E. Ríos. "Ca2+ release from the sarcoplasmic reticulum compared in amphibian and mammalian skeletal muscle." Journal of General Physiology 107, no. 1 (January 1, 1996): 1–18. http://dx.doi.org/10.1085/jgp.107.1.1.

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Puzzled by recent reports of differences in specific ligand binding to muscle Ca2+ channels, we quantitatively compared the flux of Ca2+ release from the sarcoplasmic reticulum (SR) in skeletal muscle fibers of an amphibian (frog) and a mammal (rat), voltage clamped in a double Vaseline gap chamber. The determinations of release flux were carried out by the "removal" method and by measuring the rate of Ca2+ binding to dyes in large excess over other Ca2+ buffers. To have a more meaningful comparison, the effects of stretching the fibers, of rapid changes in temperature, and of changes in the C
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Maekawa, Shun, Hitomi Iemura, Yuko Kuramochi, Nami Kosaka-Nogawa, Hironori Nishikawa, Youichi Aizawa, and Takashi Kato. "A New Animal Model for Anemia Induced by Environmental Low-Temperature: Physiology of Erythrocyte Production and Circulation." Blood 112, no. 11 (November 16, 2008): 4770. http://dx.doi.org/10.1182/blood.v112.11.4770.4770.

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Abstract To survive, organisms must adapt to changes in the ambient environment. Here, we describe a new model of anemia based on exposure of African clawed frog, Xenopus laevis to low-temperature. Frogs exposed at low-temperature (5ºC) for five days had decreased numbers of peripheral blood erythrocytes, leukocytes, and thrombocytes as well as low hemoglobin levels. By contrast, spleen erythrocytes increased in number. Cell counts returned to normal in frogs re-warmed at ambient temperature (22ºC) for two days. To confirm these observations in vivo, we labeled peripheral blood cells with fluo
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Layne, J. R., R. E. Lee, and T. L. Heil. "Freezing-induced changes in the heart rate of wood frogs (Rana sylvatica)." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 257, no. 5 (November 1, 1989): R1046—R1049. http://dx.doi.org/10.1152/ajpregu.1989.257.5.r1046.

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During the first few hours of freezing the cardiovascular system must distribute cryoprotectant throughout the body of freeze-tolerant frogs. This study presents initial documentation of the changes in heart rate of wood frogs (Rana sylvatica) during nonlethal freezing. Heart rate was determined by measuring the electrocardiogram of frogs. Within 1 min of the onset of freezing the heart rate nearly doubled to approximately 8.0 beats/min. The heart rate began to slow after the first hour of the freeze, and the heart completely stopped beating near the completion of ice formation approximately 2
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Klop-Toker, Kaya L., Jose W. Valdez, Michelle P. Stockwell, Matthew E. Edgar, Loren Fardell, Simon Clulow, John Clulow, and Michael J. Mahony. "Assessing host response to disease treatment: how chytrid-susceptible frogs react to increased water salinity." Wildlife Research 44, no. 8 (2017): 648. http://dx.doi.org/10.1071/wr16145.

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Context The severity and prevalence of the amphibian fungal pathogen, Batrachochytrium dendrobatidis (Bd) is correlated with several environmental variables, including salinity, temperature, and moisture content, which influence the pathogen’s growth and survival. Habitats that contain these environmental variables at levels outside of those optimal for Bd growth and survival may facilitate the survival of susceptible host species. Therefore, manipulation of environmental salinity is a potential management strategy to help conserve Bd-susceptible species. However, host behaviour also influence
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Baker, B. J., and J. M. L. Richardson. "The effect of artificial light on male breeding-season behaviour in green frogs, Rana clamitans melanota." Canadian Journal of Zoology 84, no. 10 (October 2006): 1528–32. http://dx.doi.org/10.1139/z06-142.

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Artificial night lighting (or ecological light pollution) is only now gaining attention as a source of long-term effects on the ecology of both diurnal and nocturnal animals. The limited data available clearly indicate that artificial light can affect physiology and behaviour of animals, leading to ecological consequences at the population, community, and ecosystem levels. Aquatic ecosystems may be particularly vulnerable to such effects, and nocturnally breeding animals such as frogs may be especially affected. To address this potential, we quantify the effects of artificial light on calling
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Rubin, Bruce K., Chris I. Cheeseman, Sita Gourishankar, and Malcolm King. "Is there a seasonal variation in mucus transport and nutrient absorption in the leopard frog?" Canadian Journal of Physiology and Pharmacology 70, no. 4 (April 1, 1992): 442–46. http://dx.doi.org/10.1139/y92-056.

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We postulated that as a hibernating species, frogs might have variable demands for nutrients at different seasons of the year and that this must be reflected in seasonal variations of physiologic processes related to nutrient transport and absorption. We examined the rate of mucus transport on the ciliated palate and the movement of nutrients across the intestinal lumen of leopard frogs, Rana pipiens. Mucus transport on the frog palate was strongly influenced by season, with maximal transport occurring in late June (Julian day 178, p = 0.0001; r = 0.58). This increased transport rate was assoc
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Alonso-Gómez, A. L., M. Tejera, M. Alonso-Bedate, and M. J. Delgado. "Response to pinealectomy and blinding in vitellogenic female frogs (Rana perezi) subjected to high temperature in autumn." Canadian Journal of Physiology and Pharmacology 68, no. 1 (January 1, 1990): 94–98. http://dx.doi.org/10.1139/y90-014.

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The present experiments were carried out to investigate the effects of pinealectomy and bilateral enucleation on the ovarian activity in Rana perezi frogs maintained in 12-h light – 12-h dark photoperiod and 20 ± 1 °C during the vitellogenetic growth in late autumn. These environmental conditions, mainly temperature, induce a gonadal and metabolic response similar to that observed in the natural habitat in summer: a marked ovarian follicular regression, a depletion of the energetic resources from fat bodies and liver, and a minimum in oestradiol circulating levels. This response is partially b
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Medler, Scott. "Anesthetic MS-222 eliminates nerve and muscle activity in frogs used for physiology teaching laboratories." Advances in Physiology Education 43, no. 1 (March 1, 2019): 69–75. http://dx.doi.org/10.1152/advan.00114.2018.

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Frogs are routinely used in physiology teaching laboratories to demonstrate important physiological processes. There have been recent directives that promote the use of the anesthetic MS-222 (tricaine methanesulfonate), rather than lowering body temperature with a cold water bath to prepare reptiles and amphibians for physiological experiments or euthanasia. Indeed, the most recent edition of the American Veterinary Medical Association (AVMA) Guidelines for the Euthanasia of Animals proclaims that chilling in water is not an appropriate method and advocates for the usage of MS-222 or other ane
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Rozprawy doktorskie na temat "Frogs – Physiology"

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Pearl, Christopher A. "Demonstration of pheromonal activity in the breeding glands of dwarf African clawed frogs (Hymenochirus sp.)." Scholarly Commons, 2000. https://scholarlycommons.pacific.edu/uop_etds/529.

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Anurans rely mainly on vocalizations for mate attraction while urodeles rely mainly on pheromones. However, the presence of breeding glands suggests that anurans may also communicate with pheromones during reproduction. Previous studies have shown that male Hymenochirus sp. are able to attract females in a Y-maze, most likely through chemical means, but the source of the attractant has not been identified. By exposing female Hymenochirus sp. to choice tests in a Y -maze it was demonstrated that the breeding glands of male Hymenochirus sp. are the source of a mate-attractant pheromone. This stu
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Madison, Amanda L. "Effects of male breeding gland in hymenochirus on female reproductive output." Scholarly Commons, 2005. https://scholarlycommons.pacific.edu/uop_etds/610.

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Normal male dwarf African clawed frogs, Hymenochirus sp., possess bilateral, sexually dimorphic, subcutaneous breeding glands just posterior to the forelimbs. Previous studies have shown these glands release pheromones that attract conspecific females. This thesis shows the pheromones also stimulate the reproductive system of conspecific females. Females exposed to normal males prior to mating then allowed to mate with the normal males released a higher number of eggs than females who were not exposed to normal males prior to mating. Microscopic examination of ovarian tissue revealed that fema
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McDearmid, Jonathan R. "Noradrenergic control of spinal motor circuitry in two related amphibian species, Xenopus laevis and Rama temporaria." Thesis, University of St Andrews, 1998. http://hdl.handle.net/10023/15058.

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1. The role of the catecholamine noradrenaline (NA) was examined during fictive swimming in Xenopus laevis tadpoles. 2. The primary effects of the amine in both embryonic and larval Xenopus was to markedly decrease motor frequency whilst simultaneously reducing rostrocaudal delays during swimming. 3. The NA-mediated modulation of swimming activity in Xenopus larvae can be reversed with phentolamine, a non-selective an adrenergic receptor antagonist, suggesting that NA may be acting through either ?1 or ?2 receptors, or a combination of both. 4. Intracellular recordings made from embryo spinal
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Pascarelli, Erica S. "Behavioral evidence for pheromonal communication : female discrimination of androgen status in male Xenopus laevis"." Scholarly Commons, 1995. https://scholarlycommons.pacific.edu/uop_etds/2289.

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Testosterone has been implicated in the production of courtship pheromones in various animals. It is hypothesized that testosterone also stimulates the production and/or release of any courtship pheromones in Xenopus laevis. Castrated male frogs were implanted with empty or testosterone(T)-filled Silastic capsules. The water from testosterone-treated frogs (C+ T) and castrated frogs with empty capsules (C) was pumped into a plastic Y-maze at a flow rate of 65 ml/min. A female frog placed in theY-maze was observed for a sixty minute trial period, and the movements and position of the female fro
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Word, James Mabry. "Physiological adjustments to aestivation and activity in the cocoon-forming frogs Cyclorana platycephala and Cyclorana maini." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0254.

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The desert-adapted frogs Cyclorana platycephala and Cyclorana maini survive long periods of inhospitably hot and dry conditions by retreating underground and aestivating. While aestivating they suspend food and water intake as well as physical activity, depress their metabolic rate by ~80 %, and form cocoons that protect them against desiccation. How these frogs function during this exceptional state is largely unknown. This work characterized a number of physiological parameters in three metabolic states spanning their natural metabolic range: during aestivation (depressed metabolism), at res
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Allen, Leon Akila Glynne. "Effect of temperature on the physiology of two exotic frogs: possible causes of distribution." Thesis, University of Canterbury. Biological Sciences, 2015. http://hdl.handle.net/10092/10822.

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Two Australian frogs were introduced to New Zealand over 100 years ago. Since their introduction they have become widespread and well established with Litoria ewingii being more prevalent in alpine and cooler areas of New Zealand, while Litoria raniformis is found in more temperate coastal areas. Very little physiological data exists for these frogs and aside from their distribution not much is known about them in New Zealand. Thus the effects of thermal acclimation and temperature change on respiration and locomotion were examined in these two exotic frogs. The more terrestrial and alpine dwe
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Pearl, Christopher A. "Demonstration of pheromonal activity in the breeding glands of dwarf African clawed frogs (Hymenochirus sp.) : a thesis." Scholarly Commons, 2001. https://scholarlycommons.pacific.edu/uop_etds/529.

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Anurans rely mainly on vocalizations for mate attraction while urodeles rely mainly on pheromones. However, the presence of breeding glands suggests that anurans may also communicate with pheromones during reproduction. Previous studies have shown that male Hymenochirus sp. are able to attract females in a Y-maze, most likely through chemical means, but the source of the attractant has not been identified. By exposing female Hymenochirus sp. to choice tests in a Y -maze it was demonstrated that the breeding glands of male Hymenochirus sp. are the source of a mate-attractant pheromone. This stu
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Wang, Yu. "HPLC method development for the evaluation of pheromones from the dwarf African clawed frog Hymenochirus." Scholarly Commons, 2003. https://scholarlycommons.pacific.edu/uop_etds/587.

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Contreras, Heidy Lorena. "Effects of natural history on osmoregulatory behaviors in two stream-dwelling frogs (Pseudacris cadaverina and P. regilla)." CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3253.

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Differences in osmoregulatory behaviors were studied in two stream-dwelling tree frogs (Pseudacris cadaverina and P. regilla) with different natural histories. This study supports the idea that the natural history of a species has a strong effect on behavior associated with osmoregulation.
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Wang, Yu. "HPLC method development for the evaluation of pheromones from the dwarf African clawed frog Hymenochirus : a thesis." Scholarly Commons, 2001. https://scholarlycommons.pacific.edu/uop_etds/587.

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Książki na temat "Frogs – Physiology"

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Frogs: Biology, ecology, and uses. Hauppauge, N.Y: Nova Science Publisher's, 2011.

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House, Donald. Depth perception in frogs and toads: A study in neural computing. New York: Springer-Verlag, 1989.

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House, Donald. Depth perception in frogs and toads: A study in neural computing. New York: Springer-Verlag, 1989.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 8th ed. San Francisco: Pearson/Benjamin Cummings, 2008.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 9th ed. San Francisco: Benjamin Cummings, 2009.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 8th ed. San Francisco: Pearson/Benjamin Cummings, 2009.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 6th ed. San Francisco: Benjamin Cummings, 2003.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 9th ed. San Francisco: Pearson/Benjamin Cummings, 2008.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 9th ed. San Francisco: Pearson/Benjamin Cummings, 2009.

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Marieb, Elaine Nicpon. Human anatomy & physiology laboratory manual. 7th ed. San Francisco: Benjamin Cummings, 2002.

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Części książek na temat "Frogs – Physiology"

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Loo, Donald D. F., and Ernest M. Wright. "A Frog Model for CSF Secretion." In Physiology in Health and Disease, 83–97. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0536-3_3.

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Ogawa, Yasuo, Takashi Murayama, and Nagomi Kurebayashi. "Comparison of properties of Ca2+ release channels between rabbit and frog skeletal muscles." In Muscle Physiology and Biochemistry, 191–201. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-5543-8_24.

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Roberts, J. Dale, and Danielle Edwards. "The Evolution, Physiology and Ecology of the Australian Arid-Zone Frog Fauna." In On the Ecology of Australia’s Arid Zone, 149–80. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93943-8_7.

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Schettino, T., S. Curci, and E. Frömter. "On the Mechanism of Cl− Transport in Surface Epithelial Cells of Frog Stomach as Investigated with Intracellular Chloride Microelectrodes." In Ion Measurements in Physiology and Medicine, 144–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70518-2_23.

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Geetha, N. "Normal Cardiogram of Frog." In Practical Physiology, 282. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12995_39.

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Geetha, N. "Effect of Temperature on Frog's Heart." In Practical Physiology, 286. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12995_40.

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Geetha, N. "Effect of Vagal Stimulation on Frog's Heart." In Practical Physiology, 293. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12995_43.

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Zingade, US. "Normal Cardiogram of Frog." In Manual of Practical Physiology, 218. Jaypee Brothers Medical Publishers (P) Ltd., 2007. http://dx.doi.org/10.5005/jp/books/10484_52.

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Geetha, N. "Effect of Drugs and Ions on Isolated Frog's Heart." In Practical Physiology, 297. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12995_44.

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Zingade, US. "Effect of Temperature on Frog's Heart." In Manual of Practical Physiology, 220. Jaypee Brothers Medical Publishers (P) Ltd., 2007. http://dx.doi.org/10.5005/jp/books/10484_53.

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