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https://www.readbyqxmd.com/read/28436994/erratum-influence-of-substrate-modulus-on-gecko-adhesion
#1
Mena R Klittich, Michael C Wilson, Craig Bernard, Rochelle M Rodrigo, Austin J Keith, Peter H Niewiarowski, Ali Dhinojwala
No abstract text is available yet for this article.
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28434199/repeated-evolution-of-digital-adhesion-in-geckos-a-reply-to-harrington-and-reeder
#2
Tony Gamble, Eli Greenbaum, Todd R Jackman, Anthony P Russell, Aaron M Bauer
We published a phylogenetic comparative analysis that found geckos had gained and lost adhesive toepads multiple times over their long evolutionary history (Gamble et al. 2012). This was consistent with decades of morphological studies showing geckos had evolved adhesive toepads on multiple occasions and that the morphology of geckos with ancestrally padless digits can be distinguished from secondarily padless forms. Recently, Harrington and Reeder (2017) reanalyzed data from Gamble et al. (2012) and found little support for the multiple origins hypothesis...
April 23, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28426409/a-new-species-of-oochoristica-cyclophyllidea-linstowiidae-from-non-native-mediterranean-geckos-hemidactylus-turcicus-sauria-gekkonidae-from-texas-usa
#3
Chris T McAllister, Charles R Bursey
A new species of cyclophyllidean tapeworm, Oochoristica harschi sp. nov. is described from 2 of 18 (11%) non-native Mediterranean geckos (Hemidactylus turcicus) collected in June 2016 from Tom Green County, Texas, USA The new species has few characteristics in common with 17 species of Oochoristica previously described from Nearctic reptiles. Of this group, O. harschi is most similar to O. macallisteri Bursey and Goldberg, 1996 from the side-blotched lizard, Uta stansburiana from Arizona and California, USA, in number of testes, 14-20 vs...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28426402/molecular-identification-of-thelandros-scleratus-and-thelastoma-icemi-nematoda-oxyruida-using-mitochondrial-cox-1-sequences
#4
Anshu Chaudhary, Garima Kansal, Neetu Singh, Kumari Shobhna, Manu Verma, Hridaya S Singh
Two species of parasitic nematodes collected from the intestine of Brook's House Gecko, Hemidactylus brooki and American cockroach, Periplaneta americana L. The parasites were identified as Thelandros scleratus and Thelastoma icemi by PCR amplification method. Subsequently, sequence analysis of mt cox1 (504 and 540 bp) for T. scleratus and T. icemi respectively revealed that these sequences showed maximum similarity of 90% (in case of T. scleratus), 77% (in case of T. icemi), to nematode sequences available on GenBank...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28403189/rapid-forest-clearing-in-a-myanmar-proposed-national-park-threatens-two-newly-discovered-species-of-geckos-gekkonidae-cyrtodactylus
#5
Grant M Connette, Patrick Oswald, Myint Kyaw Thura, Katherine J LaJeunesse Connette, Mark E Grindley, Melissa Songer, George R Zug, Daniel G Mulcahy
Myanmar's recent transition from military rule towards a more democratic government has largely ended decades of political and economic isolation. Although Myanmar remains heavily forested, increased development in recent years has been accompanied by exceptionally high rates of forest loss. In this study, we document the rapid progression of deforestation in and around the proposed Lenya National Park, which includes some of the largest remaining areas of lowland evergreen rainforest in mainland Southeast Asia...
2017: PloS One
https://www.readbyqxmd.com/read/28398039/influence-of-humidity-on-grip-and-release-adhesion-mechanisms-for-gecko-inspired-microfibrillar-surfaces
#6
Nicholas Cadirov, Jamie A Booth, Kimberly L Turner, Jacob N Israelachvili
Geckos have developed foot pads that allow them to maintain their unique climbing ability despite vast differences of surfaces and environments, from dry desert to humid rainforest. Likewise, successful gecko-inspired mimics should exhibit adhesive and frictional performance across a similarly diverse range of climates. In this work, we focus on the effect of relative humidity (RH) on the "frictional-adhesion" behavior of gecko-inspired adhesive pads. A surface forces apparatus was used to quantitatively measure adhesion and friction forces of a microfibrillar cross-linked polydimethylsiloxane surface against a smooth hemispherical glass disk at varying relative humidity, from 0 to 100% (including fully submerged under water)...
April 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28343577/effects-of-pregnancy-on-body-temperature-and-locomotor-performance-of-velvet-geckos
#7
Buddhi Dayananda, Nora Ibargüengoytía, Martin J Whiting, Jonathan K Webb
Pregnancy is a challenging period for egg laying squamates. Carrying eggs can encumber females and decrease their locomotor performance, potentially increasing their risk of predation. Pregnant females can potentially reduce this handicap by selecting higher temperatures to increase their sprint speed and ability to escape from predators, or to speed up embryonic development and reduce the period during which they are burdened with eggs ('selfish mother' hypothesis). Alternatively, females might select more stable body temperatures during pregnancy to enhance offspring fitness ('maternal manipulation hypothesis'), even if the maintenance of such temperatures compromises a female's locomotor performance...
April 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28317246/brain-gene-expression-is-influenced-by-incubation-temperature-during-leopard-gecko-eublepharis-macularius-development
#8
Maria Michela Pallotta, Mimmo Turano, Raffaele Ronca, Marcello Mezzasalma, Agnese Petraccioli, Gaetano Odierna, Teresa Capriglione
Sexual differentiation (SD) during development results in anatomical, metabolic, and physiological differences that involve not only the gonads, but also a variety of other biological structures, such as the brain, determining differences in morphology, behavior, and response in the breeding season. In many reptiles, whose sex is determined by egg incubation temperature, such as the leopard gecko, Eublepharis macularius, embryos incubated at different temperatures clearly differ in the volume of brain nuclei that modulate behavior...
March 20, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28298595/incubation-under-climate-warming-affects-learning-ability-and-survival-in-hatchling-lizards
#9
Buddhi Dayananda, Jonathan K Webb
Despite compelling evidence for substantial individual differences in cognitive performance, it is unclear whether cognitive ability influences fitness of wild animals. In many animals, environmental stressors experienced in utero can produce substantial variation in the cognitive abilities of offspring. In reptiles, incubation temperatures experienced by embryos can influence hatchling brain function and learning ability. Under climate warming, the eggs of some lizard species may experience higher temperatures, which could affect the cognitive abilities of hatchlings...
March 2017: Biology Letters
https://www.readbyqxmd.com/read/28287647/influence-of-substrate-modulus-on-gecko-adhesion
#10
Mena R Klittich, Michael C Wilson, Craig Bernard, Rochelle M Rodrigo, Austin J Keith, Peter H Niewiarowski, Ali Dhinojwala
The gecko adhesion system fascinates biologists and materials scientists alike for its strong, reversible, glue-free, dry adhesion. Understanding the adhesion system's performance on various surfaces can give clues as to gecko behaviour, as well as towards designing synthetic adhesive mimics. Geckos encounter a variety of surfaces in their natural habitats; tropical geckos, such as Gekko gecko, encounter hard, rough tree trunks as well as soft, flexible leaves. While gecko adhesion on hard surfaces has been extensively studied, little work has been done on soft surfaces...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28213971/mass-turnover-and-recovery-dynamics-of-a-diverse-australian-continental-radiation
#11
Ian G Brennan, Paul M Oliver
Trends in global and local climate history have been linked to observed macroevolutionary patterns across a variety of organisms. These climatic pressures may unilaterally or asymmetrically influence the evolutionary trajectory of clades. To test and compare signatures of changing global (Eocene-Oligocene boundary cooling) and continental (Miocene aridification) environments on a continental fauna, we investigated the macroevolutionary dynamics of one of Australia's most diverse endemic radiations, pygopodoid geckos...
February 18, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28212488/graphene-oxide-glue-electrode-for-fabrication-of-vertical-elastic-conductive-columns
#12
Liusi Yang, Mingchu Zou, Shiting Wu, Wenjing Xu, Huaisheng Wu, Anyuan Cao
Graphene has a planar atomic structure with high flexibility and might be used as ultrathin conductive glues or adhesion layers in electronics and other applications. Here, we show that graphene oxide (GO) sheets condensed from solution can act as a pure, thin-layer, nonpenetrating glue for fabrication of vertical architectures anchored on rigid and flexible substrates. Carbon nanotube (CNT) sponges are used as a porous template to make polymer-reinforced composite columns, to achieve both high conductivity and elastic behavior...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28194954/gecko-inspired-nanotentacle-surface-enhanced-raman-spectroscopy-substrate-for-sampling-and-reliable-detection-of-pesticide-residues-in-fruits-and-vegetables
#13
Pan Wang, Long Wu, Zhicheng Lu, Qin Li, Wenmin Yin, Fan Ding, Heyou Han
Rapid sampling and multicomponent detection are crucial for monitoring of pesticide residues analysis. Here, a gecko-inspired nanotentacle surface-enhanced Raman spectroscopy (G-SERS) platform is proposed for the first time for the simultaneous detection of three kinds of pesticides via a simple and intuitive "press and peeled-off" approach. The G-SERS platform obtained from seeding deposition of silver nanoparticles (Ag NPs) on 3D PDMS nanotentacle array is flexible and free-standing. Compared with other substrates, this G-SERS substrate can simultaneously provide outstanding SERS activity (enhancement factor = 1...
February 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28194313/off-the-scale-a-new-species-of-fish-scale-gecko-squamata-gekkonidae-geckolepis-with-exceptionally-large-scales
#14
Mark D Scherz, Juan D Daza, Jörn Köhler, Miguel Vences, Frank Glaw
The gecko genus Geckolepis, endemic to Madagascar and the Comoro archipelago, is taxonomically challenging. One reason is its members ability to autotomize a large portion of their scales when grasped or touched, most likely to escape predation. Based on an integrative taxonomic approach including external morphology, morphometrics, genetics, pholidosis, and osteology, we here describe the first new species from this genus in 75 years: Geckolepis megalepissp. nov. from the limestone karst of Ankarana in northern Madagascar...
2017: PeerJ
https://www.readbyqxmd.com/read/28193810/thresholds-and-noise-limitations-of-colour-vision-in-dim-light
#15
REVIEW
Almut Kelber, Carola Yovanovich, Peter Olsson
Colour discrimination is based on opponent photoreceptor interactions, and limited by receptor noise. In dim light, photon shot noise impairs colour vision, and in vertebrates, the absolute threshold of colour vision is set by dark noise in cones. Nocturnal insects (e.g. moths and nocturnal bees) and vertebrates lacking rods (geckos) have adaptations to reduce receptor noise and use chromatic vision even in very dim light. In contrast, vertebrates with duplex retinae use colour-blind rod vision when noisy cone signals become unreliable, and their transition from cone- to rod-based vision is marked by the Purkinje shift...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28187551/systematics-of-a-small-i-gehyra-i-squamata-gekkonidae-from-the-einasleigh-uplands-queensland-description-of-a-new-range-restricted-species
#16
Gayleen Bourke, Renae C Pratt, Eric Vanderduys, Craig Moritz
The tropical savannah landscapes of Australia's north, though previously overshadowed by the biodiverse rainforests of the Wet Tropics, are themselves now attracting interest for their biological significance and uniqueness. The Einasleigh Uplands region of north-east Queensland is home to a diverse group of mammals and reptiles and was previously recognised for its importance in shaping speciation in birds. Here we add a small saxicoline gecko to a growing list of recently described reptiles that are endemic to this region...
February 9, 2017: Zootaxa
https://www.readbyqxmd.com/read/28186403/discretely-supported-dry-adhesive-film-inspired-by-biological-bending-behavior-for-enhanced-performance-on-a-rough-surface
#17
Hong Hu, Hongmiao Tian, Jinyou Shao, Xiangming Li, Yue Wang, Yan Wang, Yu Tian, Bingheng Lu
Biologically inspired dry adhesion has recently become a research hot topic because of its practical significance in scientific research and instrumental technology. Yet, most of the current studies merely focus on borrowing the concept from some finer biological contact elements but lose sight of the foundation ones that play an equally important role in the adhesion functionality. Inspired by the bending behavior of the flexible foundation element of a gecko (lamellar skin) in attachment motion, in this study, a new type of dry adhesive structure was proposed, wherein a mushroom-shaped micropillar array behaving as a strongly adhesive layer was engineered on a discretely supported thin film...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28149678/three-new-karst-dwelling-cnemaspis-strauch-1887-squamata-gekkoniade-from-peninsular-thailand-and-the-phylogenetic-placement-of-c-%C3%A2-punctatonuchalis-and-c-%C3%A2-vandeventeri
#18
Perry Lee Wood, L Lee Grismer, Anchalee Aowphol, César A Aguilar, Micheal Cota, Marta S Grismer, Matthew L Murdoch, Jack W Sites
Three new species of Rock Geckos Cnemaspis lineogularis sp. nov., C. phangngaensis sp. nov., and C. thachanaensis sp. nov. of the chanthaburiensis and siamensis groups are described from the Thai portion of the Thai-Malay Peninsula. These new species are distinguished from all other species in their two respective groups based on a unique combination of morphological characteristics, which is further supported by mitochondrial DNA (mtDNA) from the NADH dehydrogenase subunit 2 gene (ND2). Cnemaspis lineogularis sp...
2017: PeerJ
https://www.readbyqxmd.com/read/28132673/recent-advances-in-the-study-and-design-of-parahydrophobic-surfaces-from-natural-examples-to-synthetic-approaches
#19
REVIEW
Caroline R Szczepanski, Frédéric Guittard, Thierry Darmanin
Parahydrophobic surfaces are an interesting class of materials that combines both high contact angles and very strong adhesion with wetting fluids, most commonly water. This unique set of properties makes parahydrophobic surfaces attractive for a variety of applications, including water harvesting and collection, guided fluid transport, and membrane development, amongst many others. Taking inspiration from natural surfaces that display this same behavior such as rose petals and gecko feet, synthetic approaches aim to incorporate the nano- and micro-scale topography as well as the low surface energy chemistry found on these interfaces...
March 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28130071/an-energetic-perspective-on-tissue-regeneration-the-costs-of-tail-autotomy-in-growing-geckos
#20
Zuzana Starostová, Lumír Gvoždík, Lukáš Kratochvíl
Tail autotomy is a crucial antipredatory lizard response, which greatly increases individual survival, but at the same time also compromises locomotor performance, sacrifices energy stores and induces a higher burden due to the ensuing response of regenerating the lost body part. The potential costs of tail autotomy include shifts in energy allocation and metabolic rates, especially in juveniles, which invest their energy primarily in somatic growth. We compared the metabolic rates and followed the growth of juvenile males with and without regenerating tails in the Madagascar ground gecko (Paroedura picta), a nocturnal ground-dwelling lizard...
January 24, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
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