keyword
MENU ▼
Read by QxMD icon Read
search

Squirrel

keyword
https://www.readbyqxmd.com/read/29223874/the-hypoxia-tolerant-vertebrate-brain-arresting-synaptic-activity
#1
Leslie T Buck, Matthew E Pamenter
The ion channel arrest hypothesis has been the foundation of three decades of research into the underlying mechanisms of hypoxia/anoxia tolerance in several key species, including: painted turtles, goldfish, crucian carp, naked mole rats, and arctic and ground squirrels. The hypothesis originally stated that hypoxia/anoxia tolerant species ought to have fewer ion channels per area membrane and/or mechanisms to regulate the permeability of ions through channels. Today we can add to this and include mechanisms to remove channels from membranes and the expression of low conductance isoforms...
December 6, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29218224/coping-with-differences-in-snow-cover-the-impact-on-the-condition-physiology-and-fitness-of-an-arctic-hibernator
#2
Michael J Sheriff, Rudy Boonstra, Rupert Palme, C Loren Buck, Brian M Barnes
The Earth's climate is changing at an unprecedented rate and, as ecologists, we are challenged with the difficult task of predicting how individuals and populations will respond to climate-induced changes to local and global ecosystems. Although we are beginning to understand some of the responses to changing seasonality, the physiological mechanisms that may drive these responses remain unknown. Using long-term data comparing two nearby populations (<20 km apart) of free-living arctic ground squirrels in northern Alaska, we have previously shown that the timing of spring snowmelt greatly influences their phenology of hibernation and reproduction in a population and site-specific manner...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/29202201/prevalence-and-seasonality-of-fleas-associated-with-california-ground-squirrels-and-the-potential-risk-of-tularemia-in-an-outdoor-non-human-primate-research-facility
#3
Tara Roth, Rebecca Sammak, Janet Foley
Ectoparasites at primate research centers may be difficult to control, e.g. without exposing non-human primates (NHPs) to toxicants, but their impact on NHP health is poorly understood. In 2010, there was an epizootic of tularemia at the California National Primate Research Center (CNPRC) in Yolo County, California that resulted in 20 confirmed and suspect clinical cases in outdoors housed rhesus macaques (Macaca mulatta [Zimmermann]) and a 53% seroprevalence in the southern section of the colony. We studied ectoparasite burdens at the CNPRC in order to understand possible conditions at the time of the epizootic and provide data for the management of ectoparasites for the future...
November 30, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29182145/experimental-zika-virus-infection-of-neotropical-primates
#4
John A Vanchiere, Julio C Ruiz, Alan G Brady, Thomas J Kuehl, Lawrence E Williams, Wallace B Baze, Gregory K Wilkerson, Pramod N Nehete, Gloria B McClure, Donna L Rogers, Shannan L Rossi, Sasha R Azar, Christopher M Roundy, Scott C Weaver, Nikos Vasilakis, Joe H Simmons, Christian R Abee
The establishment of a sylvatic reservoir of Zika virus (ZIKV) in the Americas is dependent on the susceptibility of primates of sufficient population density, the duration and magnitude of viremia, and their exposure to the human mosquito-borne transmission cycle. To assess the susceptibility of squirrel (Saimiri sp.) and owl monkeys (Aotus sp.) to infection, we inoculated four animals of each species with ZIKV from the current epidemic. Viremia in the absence of detectible disease was observed in both species and seroconversion occurred by day 28...
November 27, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29168615/the-impact-of-rewilding-species-introductions-and-climate-change-on-the-structure-and-function-of-the-yukon-boreal-forest-ecosystem
#5
Rudy Boonstra, Stan Boutin, Thomas S Jung, Charles J Krebs, Shawn Taylor
Community and ecosystem changes are happening in the pristine boreal forest ecosystem of the Yukon for two reasons. First, climate change is affecting the abiotic environment (temperature, rainfall, growing season) and driving changes in plant productivity and predator-prey interactions. Secondly, simultaneously change is occurring because of mammal species reintroductions and rewilding. The key ecological question is the impact these faunal changes will have on trophic dynamics. Primary productivity in the boreal forest is increasing because of climatic warming, but plant species composition is unlikely to change significantly during the next 50-100 years...
November 23, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/29168614/eastern-gray-squirrels-are-consistent-shoppers-of-seed-traits-insights-from-discrete-choice-experiments
#6
Mekala Sundaram, Nathanael I Lichti, Nicole J Olynk Widmar, Robert K Swihart
Seeds of many hardwood trees are dispersed by scatter-hoarding rodents, and this process is often mediated by the traits of seeds. Although numerous studies have linked seed traits to seed preference by rodents, little is known about how rodents forage for seeds when multiple desirable and undesirable seed traits are available simultaneously. Here, we adopt a novel method of designing choice experiments to study how eastern gray squirrels (Sciurus carolinensis) select for 6 traits (caloric value, protein content, tannin concentration, kernel mass, dormancy period and toughness of shell) among seeds...
November 23, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/29166160/sex-dependent-phenological-plasticity-in-an-arctic-hibernator
#7
Cory T Williams, C Loren Buck, Michael J Sheriff, Melanie M Richter, Jesse S Krause, Brian M Barnes
Hibernation provides a means of escaping the metabolic challenges associated with seasonality, yet the ability of mammals to prolong or reenter seasonal dormancy in response to extreme weather events is unclear. Here, we show that Arctic ground squirrels in northern Alaska exhibited sex-dependent plasticity in the physiology and phenology of hibernation in response to a series of late spring snowstorms in 2013 that resulted in the latest snowmelt on record. Females and nonreproductive males responded to the >1-month delay in snowmelt by extending heterothermy or reentering hibernation after several days of euthermy, leading to a >2-week delay in reproduction compared to surrounding years...
December 2017: American Naturalist
https://www.readbyqxmd.com/read/29156564/wireless-monitoring-of-induction-machine-rotor-physical-variables
#8
Jefferson Doolan Fernandes, Francisco Elvis Carvalho Souza, Glauco George Cipriano Maniçoba, Andrés Ortiz Salazar, José Alvaro de Paiva
With the widespread use of electric machines, there is a growing need to extract information from the machines to improve their control systems and maintenance management. The present work shows the development of an embedded system to perform the monitoring of the rotor physical variables of a squirrel cage induction motor. The system is comprised of: a circuit to acquire desirable rotor variable(s) and value(s) that send it to the computer; a rectifier and power storage circuit that converts an alternating current in a continuous current but also stores energy for a certain amount of time to wait for the motor's shutdown; and a magnetic generator that harvests energy from the rotating field to power the circuits mentioned above...
November 18, 2017: Sensors
https://www.readbyqxmd.com/read/29155730/long-term-live-imaging-device-for-improved-experimental-manipulation-of-zebrafish-larvae
#9
Kayla Huemer, Jayne M Squirrell, Robert Swader, Kirsten Pelkey, Danny C LeBert, Anna Huttenlocher, Kevin W Eliceiri
The zebrafish larva is an important model organism for both developmental biology and wound healing. Further, the zebrafish larva is a valuable system for live high-resolution microscopic imaging of dynamic biological phenomena in space and time with cellular resolution. However, the traditional method of agarose encapsulation for live imaging can impede larval development and tissue regrowth. Therefore, this manuscript describes the zWEDGI (zebrafish Wounding and Entrapment Device for Growth and Imaging), which was designed and fabricated as a functionally compartmentalized device to orient larvae for high-resolution microscopy while permitting caudal fin transection within the device and subsequent unrestrained tail development and re-growth...
October 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29145385/squirrels-that-chunk
#10
Steve Mirsky
No abstract text is available yet for this article.
November 14, 2017: Scientific American
https://www.readbyqxmd.com/read/29116449/comparative-pulvinar-organization-across-different-primate-species
#11
Ricardo Gattass, Juliana G M Soares, Bruss Lima
In this chapter, we compare the pattern of pulvinar immunohistochemical staining for the calcium-binding proteins calbindin and parvalbumin and for the neurofilament protein SMI-32 in macaque, capuchin, and squirrel monkeys. This group of New and Old World primates shares five similar pulvinar subdivisions: PIP, PIM, PIC, PIL, and PILS. In the Old World macaque monkey, the inferior-lateral pulvinar can be subdivided into the P1 and P2 fields based on its connectivity with visual area V1. On the other hand, only the P1 field and no P2 was found in the New World capuchin monkey...
2018: Advances in Anatomy, Embryology, and Cell Biology
https://www.readbyqxmd.com/read/29108557/seasonal-energetics-and-torpor-use-in-north-american-flying-squirrels
#12
Megan N Olson, Jeff Bowman, Gary Burness
Seasonal cold temperatures require mammals to use morphological, behavioural, or physiological traits to survive periods of extreme cold and food shortage. Torpor is a physiological state that minimizes energy requirements by decreasing resting metabolic rate (MR) and body temperature (Tb). Many rodent species are capable of torpor, however, evidence in northern and southern flying squirrels (Glaucomys sabrinus and Glaucomys volans, respectively) has remained anecdotal. We experimentally attempted to induce torpor in wild-caught flying squirrels by lowering ambient temperature (Ta) and measuring MR using open-flow respirometry...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29096718/stress-amplifies-sex-differences-in-primate-prefrontal-profiles-of-gene-expression
#13
Alex G Lee, Megan Hagenauer, Devin Absher, Kathleen E Morrison, Tracy L Bale, Richard M Myers, Stanley J Watson, Huda Akil, Alan F Schatzberg, David M Lyons
BACKGROUND: Stress is a recognized risk factor for mood and anxiety disorders that occur more often in women than men. Prefrontal brain regions mediate stress coping, cognitive control, and emotion. Here, we investigate sex differences and stress effects on prefrontal cortical profiles of gene expression in squirrel monkey adults. METHODS: Dorsolateral, ventrolateral, and ventromedial prefrontal cortical regions from 18 females and 12 males were collected after stress or no-stress treatment conditions...
November 2, 2017: Biology of Sex Differences
https://www.readbyqxmd.com/read/29084219/ecological-niche-modeling-and-distribution-of-ornithodoros-hermsi-associated-with-tick-borne-relapsing-fever-in-western-north-america
#14
Kylie M Sage, Tammi L Johnson, Michael B Teglas, Nathan C Nieto, Tom G Schwan
Tick-borne relapsing fever in western North America is a zoonosis caused by the spirochete bacterium, Borrelia hermsii, which is transmitted by the bite of infected Ornithodoros hermsi ticks. The pathogen is maintained in natural cycles involving small rodent hosts such as chipmunks and tree squirrels, as well as the tick vector. In order for these ticks to establish sustained and viable populations, a narrow set of environmental parameters must exist, primarily moderate temperatures and moderate to high amounts of precipitation...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29075450/multilevel-landscape-utilization-of-the-siberian-flying-squirrel-scale-effects-on-species-habitat-use
#15
Jaanus Remm, Ilpo K Hanski, Sakari Tuominen, Vesa Selonen
Animals use and select habitat at multiple hierarchical levels and at different spatial scales within each level. Still, there is little knowledge on the scale effects at different spatial levels of species occupancy patterns. The objective of this study was to examine nonlinear effects and optimal-scale landscape characteristics that affect occupancy of the Siberian flying squirrel, Pteromys volans, in South- and Mid-Finland. We used presence-absence data (n = 10,032 plots of 9 ha) and novel approach to separate the effects on site-, landscape-, and regional-level occupancy patterns...
October 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29064843/touchscreen-technology-in-the-study-of-cognition-related-behavior
#16
Brian D Kangas, Jack Bergman
There is a growing need for new translational animal models designed to capture complex behavioral phenotypes implicated in addiction and other neuropsychiatric conditions. For example, a complete understanding of the effects of commonly abused drugs, as well as candidate medications, requires assessments of their effects on learning, memory, attention, and other cognition-related behavior. Modern touch-sensitive technology provides an extremely flexible means to expose an experimental subject to a variety of complex behavioral tasks designed to assay dimensions of cognitive function before, during, and after drug administration...
December 2017: Behavioural Pharmacology
https://www.readbyqxmd.com/read/29055694/dna-barcoding-of-metacestodes-found-in-the-guerlinguetus-ingrami-rodentia-sciuridae-reveals-the-occurrence-of-hydatigera-taeniaeformis-sensu-stricto-cyclophyllidea-taeniidae-in-the-americas
#17
Érica Munhoz Mello, Luis Fernando Viana Furtado, Élida Mara Leite Rabelo, Hudson Alves Pinto
The existence of cryptic species in the genus Hydatigera, cyclophillid cestodes, mainly of felids, was recently described based on molecular studies of parasites from Asia, Europe and Africa. However, the occurrence of H. taeniaeformis sensu stricto (s.s.), the species more widely distributed and with a presumed specificity for murid rodents as intermediate hosts, has not been formally described in Americas. In the present study, during necropsy of an Ingram's squirrel specimen, Guerlinguetus ingrami, found dead in the municipality of Belo Horizonte, Minas Gerais state, Brazil, strobilocerci were found in the liver...
October 18, 2017: Parasitology International
https://www.readbyqxmd.com/read/29048992/eurasian-red-squirrels-show-little-seasonal-variation-in-metabolism-in-food-enriched-habitat
#18
James M Turner, Stephanie Reher, Lisa Warnecke, Kathrin H Dausmann
Energy expenditure and ambient temperature (Ta) are intrinsically linked through changes in an animal's metabolic rate. While the nature of this relationship is stable, the breadth of change in thermoregulatory cost varies with body size and physiological acclimatization to season. To explore seasonal metabolic changes of small mammals, we studied a population of Eurasian red squirrels (Sciurus vulgaris) in a seminatural environment with a year-round supply of natural and supplemented food. In each season we measured the metabolic rate of wild-caught red squirrels, using open-flow respirometry, and hypothesized that individuals would make adjustments to contend with seasonal weather conditions...
November 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29043084/multi-species-genetic-connectivity-in-a-terrestrial-habitat-network
#19
Robby R Marrotte, Jeff Bowman, Michael G C Brown, Chad Cordes, Kimberley Y Morris, Melanie B Prentice, Paul J Wilson
BACKGROUND: Habitat fragmentation reduces genetic connectivity for multiple species, yet conservation efforts tend to rely heavily on single-species connectivity estimates to inform land-use planning. Such conservation activities may benefit from multi-species connectivity estimates, which provide a simple and practical means to mitigate the effects of habitat fragmentation for a larger number of species. To test the validity of a multi-species connectivity model, we used neutral microsatellite genetic datasets of Canada lynx (Lynx canadensis), American marten (Martes americana), fisher (Pekania pennanti), and southern flying squirrel (Glaucomys volans) to evaluate multi-species genetic connectivity across Ontario, Canada...
2017: Movement Ecology
https://www.readbyqxmd.com/read/29037383/regulation-of-pyruvate-dehydrogenase-pdh-in-the-hibernating-ground-squirrel-ictidomys-tridecemlineatus
#20
Sanoji Wijenayake, Shannon N Tessier, Kenneth B Storey
Pyruvate dehydrogenase (PDH) is a vital regulatory enzyme that catalyzes the conversion of pyruvate into acetyl-CoA and connects anaerobic glycolysis to aerobic TCA cycle. Post-translational inhibition of PDH activity via three serine phosphorylation sites (pS232, pS293, and pS300) regulate the metabolic flux through the TCA cycle, decrease glucose utilization, and facilitate lipid metabolism during times of nutrient deprivation. As metabolic readjustment is necessary to survive hibernation, the purpose of this study was to explore the post-translational regulation of pyruvate dehydrogenase and the expression levels of four mitochondrial serine/threonine kinases (PDHKs), during torpor-arousal cycles in liver, heart, and skeletal muscle of 13-lined ground squirrels...
October 2017: Journal of Thermal Biology
keyword
keyword
44163
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"