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https://www.readbyqxmd.com/read/29048992/eurasian-red-squirrels-show-little-seasonal-variation-in-metabolism-in-food-enriched-habitat
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/29029730/assessing-the-diversity-of-rodent-borne-viruses-exploring-of-high-throughput-sequencing-and-classical-amplification-sequencing-approaches
#4
Stephan Drewes, Petra Straková, Jan F Drexler, Jens Jacob, Rainer G Ulrich
Rodents are distributed throughout the world and interact with humans in many ways. They provide vital ecosystem services, some species are useful models in biomedical research and some are held as pet animals. However, many rodent species can have adverse effects such as damage to crops and stored produce, and they are of health concern because of the transmission of pathogens to humans and livestock. The first rodent viruses were discovered by isolation approaches and resulted in break-through knowledge in immunology, molecular and cell biology, and cancer research...
2017: Advances in Virus Research
https://www.readbyqxmd.com/read/29029144/broad-range-survey-of-vector-borne-pathogens-and-tick-host-identification-of-ixodes-ricinus-from-southern-czech-republic
#5
Vaclav Honig, Heather E Carolan, Zuzana Vavruskova, Christian Massire, Michael R Mosel, Christopher D Crowder, Megan A Rounds, David J Ecker, Daniel Ruzek, Libor Grubhoffer, Benjamin J Luft, Mark W Eshoo
Ixodes ricinus ticks are vectors of numerous human and animal pathogens. They are host generalists able to feed on more than 300 vertebrate species. The prevalence of tick-borne pathogens is influenced by host-vector-pathogen interactions that results in spatial distribution of infection risk. Broad-range PCR and electrospray ionization mass-spectrometry (PCR/ESI-MS) was used to analyze 435 I. ricinus nymphs from four localities in the south of the Czech Republic for the species identification of tick-borne pathogens...
October 3, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28992520/native-and-introduced-squirrels-in-italy-host-different-cryptosporidium-spp
#6
Jitka Prediger, Michaela Horčičková, Lada Hofmannová, Bohumil Sak, Nicola Ferrari, Maria Vittoria Mazzamuto, Claudia Romeo, Lucas A Wauters, John McEvoy, Martin Kváč
The present study was undertaken to describe Cryptosporidium spp. infection in tree squirrels from 17 locations in Northern Italy. A total of 357 squirrels were examined, including species native to Europe (Sciurus vulgaris; n=123), and species introduced from North America (Sciurus carolinensis; n=162) and Southeast Asia (Callosciurus erythraeus; n=72). Faecal samples of all squirrels were examined for the presence of Cryptosporidium infection by microscopy (flotation method) and PCR/sequence analysis of the Cryptosporidium 18S rRNA, actin, and gp60 genes...
September 21, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28989788/caching-for-where-and-what-evidence-for-a-mnemonic-strategy-in-a-scatter-hoarder
#7
Mikel M Delgado, Lucia F Jacobs
Scatter-hoarding animals face the task of maximizing retrieval of their scattered food caches while minimizing loss to pilferers. This demand should select for mnemonics, such as chunking, i.e. a hierarchical cognitive representation that is known to improve recall. Spatial chunking, where caches with the same type of content are related to each other in physical location and memory, would be one such mechanism. Here we tested the hypothesis that scatter-hoarding eastern fox squirrels (Sciurus niger) are organizing their caches in spatial patterns consistent with a chunking strategy...
September 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28985332/trade-offs-influencing-the-physiological-ecology-of-hibernation-in-temperate-zone-bats
#8
Craig K R Willis
Seasonality of temperature and food availability can lead to trade-offs between the benefits of immediate reproduction and costs associated with mortality risk from starvation, inclement weather, or predation. Hibernating mammals exhibit an enormous seasonal shift in physiology and behavior and provide a useful system to examine the effect of this trade-off on key events in the annual cycle. Most of what we understand about the ecological energetics and phenology of hibernation comes from studies of rodent hibernators such as ground squirrels, chipmunks, and dormice...
July 26, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28984227/leprosy-in-pre-norman-suffolk-uk-biomolecular-and-geochemical-analysis-of-the-woman-from-hoxne
#9
Sarah Inskip, G Michael Taylor, Sue Anderson, Graham Stewart
PURPOSE: A woman's skull, exhibiting features of lepromatous leprosy (LL), was recovered from a garden in Hoxne, Suffolk. The absence of post crania and lack of formal excavation meant that diagnosis and dating was uncertain. The aim of this research was to confirm the diagnosis using biomolecular means and second, to place it in context with other British leprosy cases using SNP genotyping and radiocarbon dating. METHODOLOGY: Bone from the skull was analysed by ancient DNA (aDNA) methods and subjected to radiocarbon dating...
October 6, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28976820/distribution-and-diversity-of-borrelia-burgdorferi-sensu-lato-group-bacteria-in-sciurids-of-california
#10
Austin N Roy, Mary H Straub, Nicole Stephenson, Kathleen E Sholty, Janet Foley
California has a remarkable diversity of squirrel and chipmunk species (sciurids), and five named and several unnamed genospecies in the Borrelia burgdorferi sensu lato group (BBSL) of bacteria as well, many of which utilize sciurids as reservoirs. We investigated the prevalence, spatial distribution, and diversity of BBSL in sciurids of California by literature search, PCR of 585 ear tissue samples from 15 sciurid species prospectively collected across 19 California counties, and DNA sequencing when possible...
October 4, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28968195/abiotic-and-biotic-contributors-to-support-inter-epidemic-francisella-tularensis-in-an-agricultural-peri-urban-environment
#11
Tara M Roth, Janet Foley, Stan Wright
To characterize the inter-epidemic ecology of Francisella tularensis, we surveyed vertebrates and invertebrates for the abundance, spatial distribution, and status of infection at a site in northern California that had evidence of endemic type B tularemia. We collected 2910 mosquitoes, 77 biting flies, 704 ticks, 115 mammals, and 1911 aquatic invertebrates in 2013-2014. Real-time PCR on all mosquitoes, 40 biting flies, 113 aquatic invertebrates, and 650 ticks did not detect F. tularensis DNA. Indirect enzyme linked immunosorbent assay (ELISA) on 109 mammals revealed 2 (of 2, 100%) seropositive feral cats, 1 (of 24, 4...
October 2, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28962873/arctic-ground-squirrel-resist-peroxynitrite-mediated-cell-death-in-response-to-oxygen-glucose-deprivation
#12
Saurav Bhowmick, Kelly L Drew
Cerebral ischemia-reperfusion (I/R) injury initiates a cascade of events, generating nitric oxide (NO) and superoxide(O2(•-)) to form peroxynitrite (ONOO(-)), a potent oxidant. Arctic ground squirrels (AGS; Urocitellus parryii) show high tolerance to I/R injury. However, the underlying mechanism remains elusive. We hypothesize that tolerance to I/R modeled in an acute hippocampal slice preparation in AGS is modulated by reduced oxidative and nitrative stress. Hippocampal slices (400µm) from rat and AGS were subjected to oxygen glucose deprivation (OGD) using a novel microperfusion technique...
September 28, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28957461/evolution-of-alu-subfamily-structure-in-the-saimiri-lineage-of-new-world-monkeys
#13
Jasmine N Baker, Jerilyn A Walker, John A Vanchiere, Kacie R Phillippe, Corey P St Romain, Paulina Gonzalez-Quiroga, Michael W Denham, Jackson R Mierl, Miriam K Konkel, Mark A Batzer
Squirrel monkeys, Saimiri, are commonly found in zoological parks and used in biomedical research. S. boliviensis is the most common species for research; however, there is little information about genome evolution within this primate lineage. Here, we reconstruct the Alu element sequence amplification and evolution in the genus Saimiri at the time of divergence within the family Cebidae lineage. Alu elements are the most successful SINE (Short Interspersed Element) in primates. Here, we report 46 Saimiri lineage specific Alu subfamilies...
September 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28948156/short-poly-glutamine-repeat-in-the-androgen-receptor-in-new-world-monkeys
#14
Chihiro Hiramatsu, Annika Paukner, Hika Kuroshima, Kazuo Fujita, Stephen J Suomi, Miho Inoue-Murayama
The androgen receptor mediates various physiological and developmental functions and is highly conserved in mammals. Although great intraspecific length polymorphisms in poly glutamine (poly-Q) and poly glycine (poly-G) regions of the androgen receptor in humans, apes and several Old World monkeys have been reported, little is known about the characteristics of these regions in New World monkeys. In this study, we surveyed 17 species of New World monkeys and found length polymorphisms in these regions in three species (common squirrel monkeys, tufted capuchin monkeys and owl monkeys)...
December 2017: Meta Gene
https://www.readbyqxmd.com/read/28948102/can-squirrel-monkeys-learn-an-ab-n-a-grammar-a-re-evaluation-of-ravignani-et-al-2013
#15
Stefano Ghirlanda
Ravignani et al. (2013) habituated squirrel monkeys to sound sequences conforming to an AB(n)A grammar (n = 1, 2, 3), then tested them for their reactions to novel grammatical and non-grammatical sequences. Although they conclude that the monkeys "consistently recognized and generalized the sequence AB(n)A," I remark that this conclusion is not robust. The statistical significance of results depends on specific choices of data analysis, namely dichotomization of the response variable and omission of specific data points...
2017: PeerJ
https://www.readbyqxmd.com/read/28947487/cannabinoid-cb1-discrimination-effects-of-endocannabinoids-and-catabolic-enzyme-inhibitors
#16
Michael Z Leonard, Shakiru O Alapafuja, Lipin Ji, Vidyanand G Shukla, Yingpeng Liu, Spyros P Nikas, Alexandros Makriyannis, Jack Bergman, Brian D Kangas
An improved understanding of the endocannabinoid system has provided new avenues of drug discovery and development toward the management of pain and other behavioral maladies. Exogenous cannabinoid type-1 (CB1) receptor agonists such as Δ9-tetrahydrocannabinol are increasingly utilized for their medicinal actions; however, their utility is constrained by concern regarding abuse-related subjective effects. This has led to growing interest in the clinical benefit of indirectly enhancing the activity of the highly labile endocannabinoids N-arachidonoylethanolamine (anandamide; AEA) and/or 2-arachidonoylglycerol (2-AG) via catabolic enzyme inhibition...
September 25, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28944015/signatures-of-selection-in-mammalian-clock-genes-with-coding-trinucleotide-repeats-implications-for-studying-the-genomics-of-high-pace-adaptation
#17
Melanie B Prentice, Jeff Bowman, Jillian L Lalor, Michelle M McKay, Lindsay A Thomson, Cristen M Watt, Andrew G McAdam, Dennis L Murray, Paul J Wilson
Climate change is predicted to affect the reproductive ecology of wildlife; however, we have yet to understand if and how species can adapt to the rapid pace of change. Clock genes are functional genes likely critical for adaptation to shifting seasonal conditions through shifts in timing cues. Many of these genes contain coding trinucleotide repeats, which offer the potential for higher rates of change than single nucleotide polymorphisms (SNPs) at coding sites, and, thus, may translate to faster rates of adaptation in changing environments...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28936853/-classics-textual-research-and-using-situation-investigation-of-tibetan-medicine-zha-xun
#18
Yun Cao, Rui Gu, Ming-Ming Zhao, Yu-Ying Ma, Shi-Hong Zhong, Jian Rang, Peng Mi
In this article the classics textual research to the origin of "Zha-xun" was carried out, the ethnobotanical research methods, the origin of visits, key informant interviews, sample collection and textual research were applied in the research. The results showed that the hypothesis of Zha-xun"s origin mainly included "source of mine", "source of feces", "source of monkey menstrual blood" in China. There were "source of fossil", "source of the plant secretion" abroad. The authors had interviewed the villagers at origin, herbalists, Tibetan doctors, herb dealers, foreign scholars for a total of 18 people, and collecting 45 batches medicinal materials...
December 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28930029/berlin-squirrelpox-virus-a-new-poxvirus-in-red-squirrels-berlin-germany
#19
Gudrun Wibbelt, Simon H Tausch, Piotr W Dabrowski, Olivia Kershaw, Andreas Nitsche, Livia Schrick
Near Berlin, Germany, several juvenile red squirrels (Sciurus vulgaris) were found with moist, crusty skin lesions. Histology, electron microscopy, and cell culture isolation revealed an orthopoxvirus-like infection. Subsequent PCR and genome analysis identified a new poxvirus (Berlin squirrelpox virus) that could not be assigned to any known poxvirus genera.
October 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28918505/purification-and-characterization-of-skeletal-muscle-pyruvate-kinase-from-the-hibernating-ground-squirrel-urocitellus-richardsonii-potential-regulation-by-posttranslational-modification-during-torpor
#20
Ryan A V Bell, Kenneth B Storey
Ground squirrel torpor during winter hibernation is characterized by numerous physiological and biochemical changes, including alterations to fuel metabolism. During torpor, many tissues switch from carbohydrate to lipid catabolism, often by regulating key enzymes within glycolytic and lipolytic pathways. This study investigates the potential regulation of pyruvate kinase (PK), a key member of the glycolytic pathway, within the skeletal muscle of hibernating ground squirrels. PK was purified from the skeletal muscle of control and torpid Richardson's ground squirrels, and PK kinetics, structural stability, and posttranslational modifications were subsequently assessed...
September 16, 2017: Molecular and Cellular Biochemistry
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