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https://www.readbyqxmd.com/read/29432849/cultivation-of-multiple-genera-of-hydrogenotrophic-methanogens-from-different-environmental-niches
#1
Akshay Joshi, Vikram B Lanjekar, Prashant K Dhakephalkar, Sumit S Dagar
Six genera of hydrogenotrophic methanogens, namely Methanobrevibacter, Methanobacterium, Methanocorpusculum, Methanothermobacter, Methanoculleus, and Methanospirillum were cultivated from diverse environmental niches like rumen, feces, gut, and sediments using BY medium. We also report a putative novel genus and two novel species of methanogens isolated from termite, Indian star tortoise, and green iguana.
February 9, 2018: Anaerobe
https://www.readbyqxmd.com/read/29420867/applying-network-theory-to-animal-movements-to-identify-properties-of-landscape-space-use
#2
Guillaume Bastille-Rousseau, Iain Douglas-Hamilton, Stephen Blake, Joseph M Northrup, George Wittemyer
Network (graph) theory is a popular analytical framework to characterize the structure and dynamics among discrete objects, particularly effective at identifying critical hubs and patterns of connectivity. The identification of such attributes is a fundamental objective of animal movement research, yet network theory has rarely been applied directly to animal relocation data. We develop an approach that allows the analysis of movement data using network theory by defining occupied pixels as nodes and connection among these pixels as edges...
February 8, 2018: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/29410873/trophic-interactions-between-larger-crocodylians-and-giant-tortoises-on-aldabra-atoll-western-indian-ocean-during-the-late-pleistocene
#3
Torsten M Scheyer, Massimo Delfino, Nicole Klein, Nancy Bunbury, Frauke Fleischer-Dogley, Dennis M Hansen
Today, the UNESCO World Heritage Site of Aldabra Atoll is home to about 100 000 giant tortoises, Aldabrachelys gigantea, whose fossil record goes back to the Late Pleistocene. New Late Pleistocene fossils (age ca. 90-125 000 years) from the atoll revealed some appendicular bones and numerous shell fragments of giant tortoises and cranial and postcranial elements of crocodylians. Several tortoise bones show circular holes, pits and scratch marks that are interpreted as bite marks of crocodylians. The presence of a Late Pleistocene crocodylian species, Aldabrachampsus dilophus, has been known for some time, but the recently found crocodylian remains presented herein are distinctly larger than those previously described...
January 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29366714/achilles-and-the-tortoise-some-caveats-to-mathematical-modeling-in-biology
#4
REVIEW
Scott F Gilbert
Mathematical modeling has recently become a much-lauded enterprise, and many funding agencies seek to prioritize this endeavor. However, there are certain dangers associated with mathematical modeling, and knowledge of these pitfalls should also be part of a biologist's training in this set of techniques. (1) Mathematical models are limited by known science; (2) Mathematical models can tell what can happen, but not what did happen; (3) A model does not have to conform to reality, even if it is logically consistent; (4) Models abstract from reality, and sometimes what they eliminate is critically important; (5) Mathematics can present a Platonic ideal to which biologically organized matter strives, rather than a trial-and-error bumbling through evolutionary processes...
January 20, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29360549/development-and-validation-of-a-quantitative-pcr-assay-for-detection-of-emydoidea-herpesvirus-1-in-free-ranging-blanding-s-turtles-emydoidea-blandingii
#5
Dana M Lindemann, Matthew C Allender, Dan Thompson, Laura Adamovicz, Elena Dzhaman
Blanding's turtles (Emydoidea blandingii), an endangered species in Illinois, have experienced range-wide declines because of habitat degradation and fragmentation, predation, and road mortality. While ongoing studies are crucial to a thorough understanding of the natural history and demographics in these disjointed Illinois populations, infectious disease threats have been largely unevaluated. Herpesvirus outbreaks have been associated with high morbidity and mortality in populations of captive tortoises and turtles worldwide, including the family Emydidae (pond and box turtles)...
January 19, 2018: Journal of Virological Methods
https://www.readbyqxmd.com/read/29351737/identifying-genome-wide-immune-gene-variation-underlying-infectious-disease-in-wildlife-populations-a-next-generation-sequencing-approach-in-the-gopher-tortoise
#6
Jean P Elbers, Mary B Brown, Sabrina S Taylor
BACKGROUND: Infectious disease is the single greatest threat to taxa such as amphibians (chytrid fungus), bats (white nose syndrome), Tasmanian devils (devil facial tumor disease), and black-footed ferrets (canine distemper virus, plague). Although understanding the genetic basis to disease susceptibility is important for the long-term persistence of these groups, most research has been limited to major-histocompatibility and Toll-like receptor genes. To better understand the genetic basis of infectious disease susceptibility in a species of conservation concern, we sequenced all known/predicted immune response genes (i...
January 19, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29346018/the-tortoise-and-the-hare-interactions-between-reinforcement-learning-and-working-memory
#7
Anne G E Collins
Learning to make rewarding choices in response to stimuli depends on a slow but steady process, reinforcement learning, and a fast and flexible, but capacity-limited process, working memory. Using both systems in parallel, with their contributions weighted based on performance, should allow us to leverage the best of each system: rapid early learning, supplemented by long-term robust acquisition. However, this assumes that using one process does not interfere with the other. We use computational modeling to investigate the interactions between the two processes in a behavioral experiment and show that working memory interferes with reinforcement learning...
January 18, 2018: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29333669/blood-pressure-and-goal-titration-of-neurohormonal-antagonists-the-tortoise-wins-again
#8
EDITORIAL
Hector O Ventura, Mandeep R Mehra
No abstract text is available yet for this article.
January 15, 2018: European Journal of Heart Failure
https://www.readbyqxmd.com/read/29301701/thermoregulatory-challenges-in-the-habitat-of-the-world-s-smallest-tortoise-chersobius-signatus
#9
Victor J T Loehr
Ectotherms have various means of dealing with low environmental temperatures, but relatively few species have been rigorously investigated. Consequently, we have little information to predict how ectotherm populations might respond to global temperature changes. Tortoises from temperate and subtropical regions often overcome periodically cool conditions by hibernation, but speckled dwarf tortoises (Chersobius signatus) need to remain active to exploit ephemeral resources in their arid winter-rainfall habitat...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29299243/chronic-disease-in-the-mojave-desert-tortoise-host-physiology-and-recrudescence-obscure-patterns-of-pathogen-transmission
#10
Franziska C Sandmeier, K Nichole Maloney, C Richard Tracy, David Hyde, Hamid Mohammadpour, Ron Marlow, Sally DuPré, Kenneth Hunter
A seminatural, factorial-design experiment was used to quantify dynamics of the pathogen Mycoplasma agassizii and upper respiratory tract disease in the Mojave desert tortoise (Gopherus agassizii) over 2 years. Groups of initially healthy animals were separated into serologically positive (seropositive), seronegative, and artificially infected groups and paired into 23 pens. We found no evidence of long-term immune protection to M. agassizii or of immunological memory. Initially seronegative, healthy tortoises experienced an equal amount of disease when paired with other seronegative groups as when paired with seropositive and artificially infected groups-suggesting that recrudescence is as significant as transmission in introducing disease in individuals in this host-pathogen system...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29297806/extension-of-the-known-host-range-of-intranuclear-coccidiosis-infection-in-three-captive-red-footed-tortoises-chelonoidis-carbonaria
#11
Justin M Stilwell, Natalie K Stilwell, Nicole I Stacy, James F X Wellehan, Lisa L Farina
The intranuclear coccidian parasite of Testudines (TINC) is an emerging pathogen of tortoises. Three captive red-footed tortoises ( Chelonoidis carbonaria) from an isolated collection presented with multiple acute, nonspecific clinical signs. One tortoise died and was diagnosed with intranuclear coccidiosis on histopathology with confirmation by quantitative polymerase chain reaction (qPCR). In addition to tissues where TINC has been previously described, coccidia were identified in the pineal gland, choroid plexus, and testicular Sertoli cells...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29297797/detection-of-copathogens-in-free-ranging-eastern-box-turtles-terrapene-carolina-carolina-in-illinois-and-tennessee
#12
Grace A Archer, Christopher A Phillips, Laura Adamovicz, Mark Band, John Byrd, Matthew C Allender
Conservation efforts are investigating the impact of diseases within a species of interest, including prevalence and transmission and morbidity and mortality rates. However, the majority of these studies focus solely on the characteristics of a single pathogen. Recently, the role of copathogens has been reported to impact disease susceptibility and mortality. To that effect, a survey was conducted including 318 eastern box turtles ( Terrapene carolina carolina) from populations in Illinois and Tennessee in 2014 and 2015...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29230293/semen-collection-and-ejaculate-characteristics-of-the-leopard-tortoise-stigmochelys-pardalis
#13
Dawn M Zimmerman, Mark A Mitchell
The preservation of spermatozoa is an important tool used in conservation programs to increase the genetic diversity of threatened and endangered species. Although routinely used to manage conservation programs for higher vertebrates, there have been limited attempts to establish reproductive assistance programs for tortoises. The purpose of this study was to develop a model for collecting and characterizing semen in Testudinidae. Semen was collected from 13/16 (81.2%, 95% CI: 62-100) adult male leopard tortoises (Stigmochelys pardalis) via electroejaculation under propofol anesthesia...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/29230240/utility-of-endoscopic-examination-in-the-diagnosis-of-acute-graft-versus-host-disease-in-the-lower-gastrointestinal-tract
#14
Kosuke Nomura, Toshiro Iizuka, Daisuke Kaji, Hisashi Yamamoto, Yasutaka Kuribayashi, Masami Tanaka, Tsukasa Furuhata, Satoshi Yamashita, Daisuke Kikuchi, Akira Matsui, Toshifumi Mitani, Yasunori Ota, Shuichi Taniguchi, Shu Hoteya
Background and Aims: We retrospectively investigated the incidence of acute graft-versus-host disease (GVHD) in the lower gastrointestinal (GI) tract and the diagnostic accuracy of endoscopy. Methods: Of 1231 patients who underwent allogeneic hematopoietic stem cell transplantation between January 2005 and December 2014, 186 of whom underwent colonoscopy and biopsy and had no cytomegalovirus infection. The endoscopic findings and histologic diagnosis from these 186 patients were retrospectively analyzed...
2017: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/29219040/taxonomic-relationships-of-hynobius-stejnegeri-and-h-yatsui-with-description-of-the-amber-colored-salamander-from-kyushu-japan-amphibia-caudata
#15
Masafumi Matsui, Kanto Nishikawa, Atsushi Tominaga
Examination of the holotype of Hynobius stejnegeri Dunn, 1923 revealed that the species is identical with H. yatsui Oyama, 1947 , recently resurrected from H. naevius (Temminck and Schlegel, 1838). The name H. yatsui is therefore relegated to a subjective junior synonym of H. stejnegeri. The latter name, however, has been widely applied to an amber-colored or tortoise-shell salamander from Kyushu, southwestern Japan, which now requires a new name. We, thus, describe the ambercolored salamander as a new species Hynobius ikioi...
December 2017: Zoological Science
https://www.readbyqxmd.com/read/29217765/zoonotic-potential-of-salmonella-enterica-carried-by-pet-tortoises
#16
Hayley L Bruce, Paul A Barrow, Andrew N Rycroft
The prevalence of Salmonella in chelonians is not known in the UK and it is not clear whether such Salmonella strains would be pathogenic for human beings. Some strains, such as members of the Arizonae subgroup, may be unable to cause anything more than very mild disease. To determine the carriage of Salmonella in pet tortoises, cloacal swabs were taken for culture. Salmonella enterica Group D was isolated from 5 of the 89 samples. All five were from the same household of seven tortoises. Salmonella isolates were shown by PCR to carry the invA and spiC genes associated with pathogenicity islands 1 and 2...
December 7, 2017: Veterinary Record
https://www.readbyqxmd.com/read/29192279/self-righting-potential-and-the-evolution-of-shell-shape-in-gal%C3%A3-pagos-tortoises
#17
Ylenia Chiari, Arie van der Meijden, Adalgisa Caccone, Julien Claude, Benjamin Gilles
Self-righting, the capacity of an animal to self-turn after falling on its back, is a fitness-related trait. Delayed self-righting can result in loss of mating opportunities or death. Traits involved in self-righting may therefore be under selection. Galápagos giant tortoises have two main shell morphologies - saddleback and domed - that have been proposed to be adaptive. The more sloped shape on the sides of the shell and the longer extension of neck and legs of the saddlebacks could have evolved to optimize self-righting...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29164369/birth-date-promotes-a-tortoise-or-hare-tactic-for-body-mass-development-of-a-long-lived-male-ungulate
#18
Eric S Michel, Stephen Demarais, Bronson K Strickland, Guiming Wang
Maternal and early-life influences may affect life-long individual phenotype, potentially influencing reproductive success. However, some individuals may compensate for a poor start to life, which may improve longevity and reproductive success later in life. We developed four models to assess whether maternal characteristics (age, body mass and previous year cumulative lactation demand) and/or birth date influenced a long-lived mammal's phenotype to maturity. We used a directional separation analysis to assess the relative influence of each maternal characteristic and birth date on captive male white-tailed deer (Odocoileus virginianus) body mass and antler size...
November 21, 2017: Oecologia
https://www.readbyqxmd.com/read/29160216/serological-survey-of-australian-native-reptiles-for-exposure-to-ranavirus
#19
E Ariel, E Elliott, J I Meddings, J Miller, M B Santos, L Owens
Ranaviruses have been isolated from many ectothermic vertebrates, and serological surveys of both amphibians and reptiles have shown the presence of ranaviral antibodies in a proportion of these populations. An enzyme-linked immunosorbent assay (ELISA) was developed to measure serum antibodies against ranavirus in Australian reptiles. The ELISA was validated with serum from challenge trials with Bohle iridovirus (BIV) in 6 reptilian species. A preliminary sero-survey of northern Queensland riparian reptile fauna (saw-shelled turtles Myuchelys latisternum, Krefft's river turtles Emydura macquarii krefftii, freshwater crocodiles Crocodylus johnstoni, as well as the snakes Boiga irregularis, Dendrelaphis punctulatus, Tropidonophis mairii, Morelia spilota, Liasis childreni and L...
November 21, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29134096/co-infection-does-not-predict-disease-signs-in-gopherus-tortoises
#20
Chava L Weitzman, Ryan Gov, Franziska C Sandmeier, Sarah J Snyder, C Richard Tracy
In disease ecology, the host immune system interacts with environmental conditions and pathogen properties to affect the impact of disease on the host. Within the host, pathogens may interact to facilitate or inhibit each other's growth, and pathogens interact with different hosts differently. We investigated co-infection of two Mycoplasma and the association of infection with clinical signs of upper respiratory tract disease in four congeneric tortoise host species (Gopherus) in the United States to detect differences in infection risk and disease dynamics in these hosts...
October 2017: Royal Society Open Science
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