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https://www.readbyqxmd.com/read/28080907/unsedated-computed-tomography-for-diagnosis-of-pelvic-canal-obstruction-in-a-leopard-gecko-eublepharis-macularius
#1
Kelly DeCourcy, Eric T Hostnik, Josh Lorbach, Sue Knoblaugh
An adult leopard gecko ( Eublepharis macularius ) presented for lethargy, hyporexia, weight loss, decreased passage of waste, and a palpable caudal coelomic mass. Computed tomography showed a heterogeneous hyperattenuating (∼143 Hounsfield units) structure within the right caudal coelom. The distal colon-coprodeum lumen or urinary bladder was hypothesized as the most likely location for the heterogeneous structure. Medical support consisted of warm water and lubricant enema, as well as a heated environment...
December 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28078708/blood-vessel-formation-during-tail-regeneration-in-the-leopard-gecko-eublepharis-macularius-the-blastema-is-not-avascular
#2
Samantha L Payne, Hanna M Peacock, Matthew K Vickaryous
Unique among amniotes, many lizards are able to self-detach (autotomize) their tail and then regenerate a replacement. Tail regeneration involves the formation of a blastema, an accumulation of proliferating cells at the site of autotomy. Over time, cells of the blastema give rise to most of the tissues in the replacement tail. In non-amniotes capable of regenerating (such as urodeles and some teleost fish), the blastema is reported to be essentially avascular until tissue differentiation takes place. For tail regenerating lizards less is known...
January 12, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28077086/the-measure-of-success-geographic-isolation-promotes-diversification-in-pachydactylus-geckos
#3
Matthew P Heinicke, Todd R Jackman, Aaron M Bauer
BACKGROUND: Geckos of the genus Pachydactylus and their close relatives comprise the most species-rich clade of lizards in sub-Saharan Africa. Many explanations have been offered to explain species richness patterns of clades. In the Pachydactylus group, one possible explanation is a history of diversification via geographic isolation. If geographic isolation has played a key role in facilitating diversification, then we expect species in more species-rich subclades to have smaller ranges than species in less diverse subclades...
January 11, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28050465/lizard-bite-masquerading-as-scorpion-sting-envenomation
#4
Ramesh Neelannavar, Mallanagouda Patil, Shankargouda Patil, Bhavana Lakhkar, Vijaykumar Shegji
Lizard bite is very infrequent in children. Lizards tend to avoid confrontation. Bites are only inflicted when they are manipulated or when they are cornered and feel threatened. Lizard bites may be frightening but most do not cause serious health problems. The wall lizard or gecko, found in most homes, is not poisonous at all. It only checks insect population. A two-year-old boy was brought with history of lizard bite over right hand when he was trying to capture it. The child had experienced excessive sweating and irritability within two hours of bite...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28038311/the-adhesion-circle-a-new-approach-to-better-characterize-directional-gecko-inspired-dry-adhesives
#5
Yue Wang, Samuel Lehmann, Jinyou Shao, Dan Sameoto
The number of different designs of directional gecko inspired adhesives has proliferated over the past 15 years, but some basic characterization tools are still non-standardized, which can make direct comparisons of different adhesives in the literature difficult. By far the most common type of test for directional adhesives, the Load-Drag-Pull (LDP) test is useful but can miss substantial information on the exact behavior of gecko-inspired adhesives in a variety of loading conditions. Other test techniques, including angled approaches and pull-offs have been employed by a few groups but they are not as widely adopted; peel tests can be employed but require a larger amount of adhesive material to use in the test, which is not always practical given some current manufacturing constraints...
December 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28025090/temporal-organization-a-novel-mechanism-of-hormonal-control-of-male-typical-sexual-behavior-in-vertebrates
#6
Tereza Schořálková, Lukáš Kratochvíl, Lukáš Kubička
In vertebrates, male-typical sexual behavior (MSB) is largely controlled by gonadal androgens, however, the mechanism of this control is believed to vary among species. During immediate activation MSB is tightly correlated with circulating levels of androgens, while the organization of MSB by a hormonal event at a specific developmental period, early in ontogeny or during puberty, has been postulated in other lineages. Here, we put forward an alternative concept of "temporal organization". Under temporal organization longer exposure to circulating androgens is needed for the onset of MSB, which can continue for a long time after the levels of these hormones drop...
December 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27988715/two-new-species-of-ground-dwelling-i-cyrtodactylus-i-i-geckoella-i-from-the-mysore-plateau-south-india
#7
Ishan Agarwal
Two new species of ground-dwelling geckos of the genus Cyrtodactylus (Geckoella) are described from the Mysore Plateau, in southern India. The new species are members of the C. collegalensis species complex, with 8.7 % uncorrected ND2 sequence divergence from each other and greater than 10 % divergence from described members of the C. collegalensis complex, from which they differ in subtle aspects of colour pattern and morphometric ratios. The type localities of the new species are ~ 130 km apart, and 100 km and 225 km from the type locality of C...
November 15, 2016: Zootaxa
https://www.readbyqxmd.com/read/27988538/a-new-biogeographically-disjunct-giant-gecko-i-gehyra-i-gekkonidae-reptilia-from-the-east-melanesian-islands
#8
Paul M Oliver, Jonathan R Clegg, Robert N Fisher, Stephen J Richards, Peter N Taylor, Merlijn M T Jocque
The East Melanesian Islands have been a focal area for research into island biogeography and community ecology. However, previously undescribed and biogeographically significant new species endemic to this region continue to be discovered. Here we describe a phylogenetically distinct (~20% divergence at the mitochondrial ND2 gene) and biogeographically disjunct new species of gecko in the genus Gehyra, from the Admiralty and St Matthias Islands. Gehyra rohan sp. nov. can be distinguished from all congeners by the combination of its very large size, ring of bright orange scales around the eye, moderate degree of lateral folding on the limbs and body, and aspects of head, body and tail scalation...
December 14, 2016: Zootaxa
https://www.readbyqxmd.com/read/27974059/the-diversity-and-evolution-of-nematodes-pharyngodonidae-infecting-new-zealand-lizards
#9
Sarah Mockett, Trent Bell, Robert Poulin, Fátima Jorge
Host-parasite co-evolutionary studies can shed light on diversity and the processes that shape it. Molecular methods have proven to be an indispensable tool in this task, often uncovering unseen diversity. This study used two nuclear markers (18S rRNA and 28S rRNA) and one mitochondrial (cytochrome oxidase subunit I) marker to investigate the diversity of nematodes of the family Pharyngodonidae parasitizing New Zealand (NZ) lizards (lygosomine skinks and diplodactylid geckos) and to explore their co-evolutionary history...
December 15, 2016: Parasitology
https://www.readbyqxmd.com/read/27960398/highly-anisotropic-adhesive-film-made-from-upside-down-flat-and-uniform-vertically-aligned-cnts
#10
Sanghyun Hong, Troy Lundstrom, Ranajay Ghosh, Hamed Abdi, Ji Hao, Sun Kyoung Jeoung, Paul Su, Jonghwan Suhr, Ashkan Vaziri, Nader Jalili, Yung Joon Jung
We have created a multifunctional dry adhesive film with transferred vertically aligned carbon nanotubes (VA-CNTs). This unique VA-CNT film was fabricated by a multistep transfer process, converting the flat and uniform bottom of VA-CNTs grown on atomically flat silicon wafer substrates into the top surface of an adhesive layer. Unlike as-grown VA-CNTs, which have a nonuniform surface, randomly entangled CNT arrays, and a weak interface between the CNTs and substrates, this transferred VA-CNT film shows an extremely high coefficient of static friction (COF) of up to 60 and a shear adhesion force 30 times higher (12 N/cm(2)) than that of the as-grown VA-CNTs under a very small preloading of 0...
December 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27956485/ovarian-control-of-growth-and-sexual-size-dimorphism-in-a-male-larger-gecko
#11
Lukáš Kubička, Tereza Schořálková, Jan Červenka, Lukáš Kratochvíl
Sexual size dimorphism (SSD) reflects sex-specific solutions to the allocation of energy among growth, reproduction and survival; however, the proximate mechanisms behind these solutions are still poorly known even in vertebrates. In squamates, sexual differences in body size used to be attributed to direct energy allocation to energetically demanding processes, largely to reproduction. In addition, SSD is assumed to be controlled by specific endogenous mechanisms regulating growth in a sex-specific manner, namely masculinization by male gonadal androgens, or feminization by ovarian hormones...
December 12, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27927791/molecular-evolution-of-two-distinct-dmrt1-promoters-for-germ-and-somatic-cells-in-vertebrate-gonads
#12
Shuuji Mawaribuchi, Masato Musashijima, Mikako Wada, Yumi Izutsu, Erina Kurakata, Min Kyun Park, Nobuhiko Takamatsu, Michihiko Ito
The transcription factor DMRT1 has important functions in two distinct processes, somatic-cell masculinization and germ-cell development in mammals. However, it is unknown whether the functions are conserevd during evolution, and what mechanism underlies its expression in the two cell lineages. Our analysis of the Xenopus laevis and Silurana tropicalis dmrt1 genes indicated the presence of two distinct promoters: one upstream of the noncoding first exon (ncEx1), and one within the first intron. In contrast, only the ncEx1-upstream promoter was detected in the dmrt1 gene of the agnathan sand lamprey, which expressed dmrt1 exclusively in the germ cells...
December 6, 2016: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/27921104/correction-the-nanotipped-hairs-of-gecko-skin-and-biotemplated-replicas-impair-and-or-kill-pathogenic-bacteria-with-high-efficiency
#13
X Li, G S Cheung, G S Watson, J A Watson, S Lin, L Schwarzkopf, D W Green
Correction for 'The nanotipped hairs of gecko skin and biotemplated replicas impair and/or kill pathogenic bacteria with high efficiency' by X. Li, et al., Nanoscale, 2016, 8, 18860-18869.
January 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/27917935/the-effects-of-light-exposure-during-incubation-on-embryonic-development-and-hatchling-traits-in-lizards
#14
Yong-Pu Zhang, Shu-Ran Li, Jun Ping, Shi-Wen Li, Hua-Bin Zhou, Bao-Jun Sun, Wei-Guo Du
Light is an environmental factor that is known to profoundly affect embryonic development in some oviparous vertebrates, but such effects are unstudied in reptiles. We investigated the light sensitivity of lizard embryos by examining the thickness and light transmittance of eggshells as well as the effect of light on embryonic development and hatchling traits in four lizard species, the Chinese skink (Plestiodon chinensis), the northern grass lizard (Takydromus septentrionalis), the oriental leaf-toed gecko (Hemidactylus bowringii) and the Japanese gecko (Gekko japonicus)...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27889831/an-ecophysiological-background-for-biogeographic-patterns-of-two-island-lizards
#15
Miguel A Carretero, Evandro P Lopes, Raquel Vasconcelos
Distributions of sedentary ectotherms are dependent on temperature and humidity due to their low homeostatic and dispersal abilities. Lizards are strongly conditioned by temperature, but hydric environment may be also important, at least in arid environments. Biotic interactions may also play a role in range patterns, but they are of minor importance in islands where native species monopolize well-delimited niche spaces. On the arid island of São Vicente (Cabo Verde), two endemic lizards display different spatial patterns...
December 2016: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27871948/vestibular-cerebellum-of-thick-toed-geckos-chondrodactylus-turnery-gray-1864-and-c57-bl6n-mice-after-the-long-term-space-flight-on-the-biosatellite-bion-m1
#16
Proshchina Alexandra, Kharlamova Anastasia, Barabanov Valeriy, Gulimova Victoria, Saveliev Sergey
The aim of this study was to estimate the effects of long-term space flights on neuronal and glial cells of the vestibular cerebellum of C57/BL6N mice and thick-toed geckos (Chondrodactylus turnery GRAY, 1864). The cerebella from 26 mice and 13 geckos were used in this study. Ten mice and five geckos were flown aboard the BION-M1 biosatellite. The other animals were used as controls. We used immunohistochemical techniques and classical histological method to reveal cell types in the vestibular cerebellum. Nonspecific pathomorphological changes in the Purkinje cells (such as chromatolysis, vacuolization and hyperchromatosis) were observed in the flight groups...
January 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/27859776/thermally-active-liquid-crystal-network-gripper-mimicking-the-self-peeling-of-gecko-toe-pads
#17
Hamed Shahsavan, Seyyed Muhammad Salili, Antal Jákli, Boxin Zhao
Self-peeling of gecko toes is mimicked by integration of film-terminated fibrillar adhesives to hybrid nematic liquid crystal network (LCN) cantilevers. A soft gripper is developed based on the gecko-inspired attachment/detachment mechanism. Performance of the fabricated gripper for transportation of thin delicate objects is evaluated by the optimum mechanical strength of the LCN and the maximum size of the adhesive patch.
November 17, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27853534/young-relicts-and-old-relicts-a-novel-palaeoendemic-vertebrate-from-the-australian-central-uplands
#18
Paul M Oliver, Peter J McDonald
Climatic change, and in particular aridification, has played a dominant role in shaping Southern Hemisphere biotas since the mid-Neogene. In Australia, ancient and geologically stable ranges within the vast arid zone have functioned as refugia for populations of mesic taxa extirpated from surrounding areas, yet the extent to which relicts may be linked to major aridification events before or after the Pliocene has not been examined in detail. Here we use molecular phylogenetic and morphological data to show that isolated populations of saxicoline geckos in the genus Oedura from the Australian Central Uplands, formerly confounded as a single taxon, actually comprise two divergent species with contrasting histories of isolation...
October 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/27852765/light-level-impacts-locomotor-biomechanics-in-a-secondarily-diurnal-gecko-rhoptropus-afer
#19
Aleksandra V Birn-Jeffery, Timothy E Higham
Locomotion through complex habitats relies on the continuous feedback from a number of sensory systems, including vision. Animals face a visual trade-off between acuity and light sensitivity that depends on light levels, which will dramatically impact the ability to process information and move quickly through a habitat, making ambient illumination an incredibly important ecological factor. Despite this, there is a paucity of data examining ambient light in the context of locomotor dynamics. There have been several independent transitions from the nocturnal ancestor to a diurnal activity pattern among geckos...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27852758/namib-day-geckos-less-stable-in-dim-conditions
#20
Kathryn Knight
No abstract text is available yet for this article.
November 15, 2016: Journal of Experimental Biology
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