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https://www.readbyqxmd.com/read/27903511/cardiac-remodeling-and-increased-central-venous-pressure-underlie-elevated-stroke-volume-and-cardiac-output-of-seawater-acclimated-rainbow-trout
#1
Jeroen Brijs, Erik Sandblom, Esmée Dekens, Joacim Näslund, Andreas Ekström, Michael Axelsson
Substantial increases in cardiac output (CO), stroke volume (SV) and gastrointestinal blood flow are essential for euryhaline rainbow trout (Oncorhyncus mykiss) osmoregulating in seawater. However, the underlying hemodynamic mechanisms responsible for these changes are unknown. By examining a range of circulatory and cardiac morphological variables of seawater- and freshwater-acclimated rainbow trout, the present study revealed a significantly higher central venous pressure (CVP) in seawater-acclimated trout (~0...
November 30, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27892928/microfluidics-assisted-fluorescence-in-situ-hybridization-for-advantageous-human-epidermal-growth-factor-receptor-2-assessment-in-breast-cancer
#2
Huu Tuan Nguyen, Raphaël Trouillon, Seiya Matsuoka, Maryse Fiche, Laurence de Leval, Bettina Bisig, Martin Am Gijs
Fluorescence in situ hybridization (FISH) is one of the recommended techniques for human epidermal growth factor receptor 2 (HER2) status assessment on cancer tissues. Here we develop microfluidics-assisted FISH (MA-FISH), in which hybridization of the FISH probes with their target DNA strands is obtained by applying square-wave oscillatory flows of diluted probe solutions in a thin microfluidic chamber of 5 μl volume. By optimizing the experimental parameters, MA-FISH decreases the consumption of the expensive probe solution by a factor 5 with respect to the standard technique, and reduces the hybridization time to 4 h, which is four times faster than in the standard protocol...
November 28, 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/27891216/evolution-of-the-elaborate-male-intromittent-organ-of-xiphophorus-fishes
#3
Julia C Jones, Carmelo Fruciano, Anja Keller, Manfred Schartl, Axel Meyer
Internally fertilizing animals show a remarkable diversity in male genital morphology that is associated with sexual selection, and these traits are thought to be evolving particularly rapidly. Male fish in some internally fertilizing species have "gonopodia," highly modified anal fins that are putatively important for sexual selection. However, our understanding of the evolution of genital diversity remains incomplete. Contrary to the prediction that male genital traits evolve more rapidly than other traits, here we show that gonopodial traits and other nongonopodial traits exhibit similar evolutionary rates of trait change and also follow similar evolutionary models in an iconic genus of poeciliid fish (Xiphophorus spp...
October 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/27884925/sensory-flow-as-a-basis-for-a-novel-distance-cue-in-freely-behaving-electric-fish
#4
Volker Hofmann, Juan Ignacio Sanguinetti-Scheck, Leonel Gómez-Sena, Jacob Engelmann
: The sensory input that an animal receives is directly linked to its motor activity. Behavior thus enables animals to influence their sensory input, a concept referred to as active sensing. How such behavior can serve as a scaffold for generating sensory information is of general scientific interest. In this article, we investigate how behavior can shape sensory information by using some unique features of the sensorimotor system of the weakly electric fish.Based on quantitative behavioral characterizations and computational reconstruction of sensory input, we show how electrosensory flow is actively created during highly patterned, spontaneous behavior in Gnathonemus petersii The spatiotemporal structure of the sensory input provides information for the computation of a novel distance cue, which allows for a continuous estimation of distance...
November 24, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27878085/stable-isotope-based-trophic-structure-of-pelagic-fish-and-jellyfish-across-natural-and-anthropogenic-landscape-gradients-in-a-fjord-estuary
#5
Sean M Naman, Correigh M Greene, Casimir A Rice, Joshua Chamberlin, Letitia Conway-Cranos, Jeffery R Cordell, Jason E Hall, Linda D Rhodes
Identifying causes of structural ecosystem shifts often requires understanding trophic structure, an important determinant of energy flow in ecological communities. In coastal pelagic ecosystems worldwide, increasing jellyfish (Cnidaria and Ctenophora) at the expense of small fish has been linked to anthropogenic alteration of basal trophic pathways. However, this hypothesis remains untested in part because baseline description of fish-jellyfish trophic dynamics, and the environmental features that influence them are lacking...
November 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/27875720/multi-generational-xenoestrogenic-effects-of-perfluoroalkyl-acids-pfaas-mixture-on-oryzias-latipes-using-a-flow-through-exposure-system
#6
Jin Wuk Lee, Jae-Woo Lee, Yu-Jin Shin, Ji-Eun Kim, Tae-Kwon Ryu, Jisung Ryu, Jaean Lee, Pilje Kim, Kyunghee Choi, Kyunghwa Park
To elucidate the multi-generational estrogenic potential of Perfluoroalkyl acids (PFAAs) mixture, vitellogenin (VTG) expression, growth indices, histological alteration, fecundity, hatching rate, larval survival rate, and sex ratio of Japanese medaka (Oryzias latipes) were investigated by exposing the fish to a mixture of perfluorooctane sulfonate (PFOS), perfluroroctanoic acid (PFOA), perfluorobutane sulfonate (PFBS), and perfluorononanoic acid (PFNA) for three generations (238 days). Mixture composition is in the ratio of 1:1:1:1...
November 19, 2016: Chemosphere
https://www.readbyqxmd.com/read/27873385/introgression-and-selection-shaped-the-evolutionary-history-of-sympatric-sister-species-of-coral-reef-fishes-genus-haemulon
#7
Moisés A Bernal, Michelle R Gaither, W Brian Simison, Luiz A Rocha
Closely related marine species with large sympatric ranges provide opportunities to study the mechanisms of speciation, particularly when there is evidence of gene flow between the lineages. Here we focus on a case of hybridization between the sympatric sister-species Haemulon maculicauda and H. flaviguttatum, using Sanger sequencing of mitochondrial and nuclear loci, as well as 2422 single nucleotide polymorphisms (SNPs) obtained via Restriction-site Associated DNA Sequencing (RADSeq). Mitochondrial markers revealed a shared haplotype for COI and low divergence for CytB and CR between the sister species...
November 22, 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27872302/long-term-aggregation-of-larval-fish-siblings-during-dispersal-along-an-open-coast
#8
Daniel Ottmann, Kirsten Grorud-Colvert, Nicholas M Sard, Brittany E Huntington, Michael A Banks, Su Sponaugle
Pelagic dispersal of most benthic marine organisms is a fundamental driver of population distribution and persistence and is thought to lead to highly mixed populations. However, the mechanisms driving dispersal pathways of larvae along open coastlines are largely unknown. To examine the degree to which early stages can remain spatially coherent during dispersal, we measured genetic relatedness within a large pulse of newly recruited splitnose rockfish (Sebastes diploproa), a live-bearing fish whose offspring settle along the US Pacific Northwest coast after spending up to a year in the pelagic environment...
November 21, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27864911/spatio-temporal-variation-in-parasite-communities-maintains-diversity-at-the-major-histocompatibility-complex-class-ii%C3%AE-in-the-endangered-rio-grande-silvery-minnow
#9
Megan J Osborne, Tyler J Pilger, Joel D Lusk, Thomas F Turner
Climate change will strongly impact aquatic ecosystems particularly in arid and semi-arid regions. Fish-parasite interactions will also be affected by predicted altered flow and temperature regimes, and other environmental stressors. Hence, identifying environmental and genetic factors associated with maintaining diversity at immune genes is critical for understanding species' adaptive capacity. Here we combine genetic (MHC Class IIβ and microsatellites), parasitological and ecological data to explore the relationship between these factors in the remnant wild Rio Grande silvery minnow (Hybognathus amarus) population, an endangered species found in the southwestern United States...
November 19, 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27864042/migratory-behavior-metabolism-oxidative-stress-and-mercury-concentrations-in-marine-and-estuarine-european-glass-eels-anguilla-anguilla
#10
Valérie Bolliet, Julie Claveau, Marc Jarry, Patrice Gonzalez, Magalie Baudrimont, Mathilde Monperrus
The relationships between the migratory behavior, methylmercury (MeHg) concentrations, oxidative stress response and detoxification processes were investigated in glass eels collected in marine (Molliets) and estuarine (Urt) waters (Adour estuary, South West France) at the end of the fishing season (April). Glass eel migratory behavior was investigated in an experimental flume according to their response to dusk. Fish responding to the decrease in light intensity by ascending in the water column and moving with or against the flow were considered as having a high propensity to migrate (migrant)...
November 15, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27863304/combined-adsorption-and-degradation-of-the-off-flavor-compound-2-methylisoborneol-in-sludge-derived-from-a-recirculating-aquaculture-system
#11
Snir Azaria, Shlomo Nir, Jaap van Rijn
Off-flavor in fish poses a serious threat for the aquaculture industry. In the present study, removal of 2-methylisoborneol (MIB), an off-flavor causing compound, was found to be mediated by adsorption and bacterial degradation in sludge derived from an aquaculture system. A numerical model was developed which augmented Langmuir equations of kinetics of adsorption/desorption of MIB with first order degradation kinetics. When laboratory-scale reactors, containing sludge from the aquaculture system, were operated in a recirculating mode, MIB in solution was depleted to undetectable levels within 6 days in reactors with untreated sludge, while its depletion was incomplete in reactors with sterilized sludge...
November 15, 2016: Chemosphere
https://www.readbyqxmd.com/read/27862535/sexual-isolation-promotes-divergence-between-parapatric-lake-and-stream-stickleback
#12
Daniel Berner, Matthias Ammann, Eleanor Spencer, Attila Rüegg, Daniel Luescher, Dario Moser
Speciation can be initiated by adaptive divergence between populations in ecologically different habitats, but how sexually based reproductive barriers contribute to this process is less well understood. We here test for sexual isolation between ecotypes of threespine stickleback fish residing in adjacent lake and stream habitats in the Lake Constance basin, Central Europe. Mating trials in outdoor mesocosms allowing for natural reproductive behavior reveal that mating occurs preferentially between partners of the same than of the opposed ecotype...
November 18, 2016: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/27862532/spatio-temporal-genetic-structure-and-the-effects-of-long-term-fishing-in-two-partially-sympatric-offshore-demersal-fishes
#13
Romina Henriques, Sophie von der Heyden, Marek R Lipinski, Nina du Toit, Paulus Kainge, Paulette Bloomer, Conrad A Matthee
Environmental gradients have been shown to disrupt gene flow in marine species, yet their influence in structuring populations at depth remains poorly understood. The Cape hakes (Merluccius paradoxus and M. capensis) are demersal species co-occurring in the Benguela Current system, where decades of intense fishing resulted in severely depleted stocks in the past. Previous studies identified conflicting mtDNA genetic substructuring patterns and thus contrasting evolutionary trajectories for both species. Using 10 microsatellite loci, the control region of mtDNA and employing a seascape genetics approach, we investigated genetic connectivity and the impact of prolonged exploitation in the two species, which are characterized by different patterns of fishing pressure...
December 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27861861/spontaneous-polyploidy-gynogenesis-and-androgenesis-in-second-generation-f2-koi-cyprinus-carpio%C3%A2-%C3%A3-%C3%A2-goldfish-carassius-auratus-hybrids
#14
T A Delomas, B Gomelsky, A Anil, K J Schneider, J L Warner
The objective of this study was to characterize the genetics of second generation (F2 ) koi Cyprinus carpio × goldfish Carassius auratus hybrids. Spermatozoa produced by a novel, fertile F1 male were found to be diploid by flow-cytometric analysis. Backcross (F1 female × C. carpio male and C. carpio female × F1 male) juveniles were triploid, confirming that female and male F1 hybrids both produced diploid gametes. The vast majority of surviving F2 juveniles was diploid and small proportions were aneuploid (2·1n-2·3n and 3·1n-3·9n), triploid (3n) and tetraploid (4n)...
November 16, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27859226/structure-and-diversity-of-fishes-in-a-freshwater-and-coastal-subtropical-lagoon
#15
N C Ferreira, R M Guereschi, C Machado, C A Lopes, A P O Nuñer
This study examined the fish communities of Peri Lagoon in southern Brazil to aid in the development of an effective management plan because the area is under threat from human activities. Sampling of fish fauna, ichthyoplankton and limnological data were compared between sites, differing by habitat type and characteristics such as depth, substratum composition and vegetation type. Results were significantly related to site, with the highest diversity and abundance recorded at shallow vegetated sites. A total of 14 fish species were recorded throughout the lagoon, with the most abundant being Hyphessobrycon luetkenii...
November 18, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27856622/in-vitro-fermentation-of-b-gos-impact-on-faecal-bacterial-populations-and-metabolic-activity-in-autistic-and-non-autistic-children
#16
Roberta Grimaldi, Drinalda Cela, Jonathan R Swann, Jelena Vulevic, Glenn R Gibson, George Tzortzis, Adele Costabile
Children with autism spectrum disorders (ASD) often suffer gastrointestinal problems consistent with imbalances in the gut microbial population. Treatment with antibiotics or pro/prebiotics has been postulated to regulate microbiota and improve gut symptoms, but there is a lack of evidence for such approaches, especially for prebiotics. This study assessed the influence of a prebiotic galactooligosaccharide (B-GOS) on gut microbial ecology and metabolic function using faecal samples from autistic and non-autistic children in an in vitro gut model system...
November 16, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27854310/does-herd-immunity-exist-in-aquatic-animals
#17
Isaac F Standish, Travis O Brenden, Mohamed Faisal
Viral hemorrhagic septicemia virus genotype IVb (VHSV-IVb) is presently found throughout the Laurentian Great Lakes region of North America. We recently developed a DNA vaccine preparation containing the VHSV-IVb glycoprotein (G) gene with a cytomegalovirus (CMV) promoter that proved highly efficacious in protecting muskellunge (Esox masquinongy) and three salmonid species. This study was conducted to determine whether cohabitation of VHSV-IVb immunized fishes could confer protection to non-vaccinated (i.e...
November 15, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27849184/ring-chromosome-7-a-rare-structural-abnormality-in-acute-myeloid-leukemia-aml
#18
Kristie Q Liu, Carlos A Tirado
Ring chromosomes, often leading to partial deletions, are found in about 2% of cases of acute myeloid leukemia (AML) and are typically associated with a poor prognosis. Herein, we present the case of a 62-year-old female who showed markedly hypercellular marrow with sheets of myeloblasts, monoblasts, and promonocytes, confirmed by flow cytometry and cases of AML with r(7) have been reported. Analysis of these cases demonstrated that r(7) was a sole abnormality in 20%, a primary abnormality in 14%, and in the context of a complex karyotype in 66%...
2016: Journal of the Association of Genetic Technologists
https://www.readbyqxmd.com/read/27842504/epcam-as-multi-tumour-target-for-near-infrared-fluorescence-guided-surgery
#19
P B A A van Driel, M C Boonstra, H A J M Prevoo, M van de Giessen, T J A Snoeks, Q R J G Tummers, S Keereweer, R A Cordfunke, A Fish, J D H van Eendenburg, B P F Lelieveldt, J Dijkstra, C J H van de Velde, P J K Kuppen, A L Vahrmeijer, C W G M Löwik, C F M Sier
BACKGROUND: Evaluation of resection margins during cancer surgery can be challenging, often resulting in incomplete tumour removal. Fluorescence-guided surgery (FGS) aims to aid the surgeon to visualize tumours and resection margins during surgery. FGS relies on a clinically applicable imaging system in combination with a specific tumour-targeting contrast agent. In this study EpCAM (epithelial cell adhesion molecule) is evaluated as target for FGS in combination with the novel Artemis imaging system...
November 14, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27832917/immune-response-characterization-and-vaccine-potential-of-a-recombinant-chimera-comprising-b-cell-epitope-of-aeromonas-hydrophila-outer-membrane-protein-c-and-ltb
#20
Mahima Sharma, Aparna Dixit
Aeromonas hydrophila is one of the most virulent fish pathogens, causing colossal economic losses to the aquaculture industry annually. The absence of a safe and effective vaccine makes it very difficult to control this infection. Outer membrane proteins have been widely illustrated to confer protective immunity against a broad spectrum of gram negative bacteria. In the current study, we have analyzed the ability of B-cell epitopes of A. hydrophila's outer membrane protein C (OmpC) to confer protection against bacterial virulence...
December 7, 2016: Vaccine
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