Read by QxMD icon Read


Geoff Boxshall
Fifty species of sea lice, members of the family Caligidae, were collected from the marine fishes of Moreton Bay, Queensland, during two workshops held in 2016. Only 21 of these species had previously been reported from Australian waters: of the remaining 29 species, 13 are new to science and another 16 are recorded from Australia for the first time. An illustrated differential diagnosis is presented for well known species; but for new or poorly known species a full description is provided. The 13 new species are: Anuretes amplus sp...
March 18, 2018: Zootaxa
Rémy Hostettler, Scott C Cutmore, Thomas H Cribb
Combined morphological and molecular analyses are used to characterise two new species of Haplorchoides Chen, 1949 (Digenea: Heterophyidae) from an Australian siluriform fish. Haplorchoides maiwariensis n. sp. and H. daguilarensis n. sp. are described from the intestine of the Blue salmon catfish, Neoarius graeffei (Kner & Steindachner) (Siluriformes: Ariidae) from tidal reaches of the Brisbane River and from a freshwater creek off Lake Wivenhoe, Kipper Creek, Australia. The two new species most obviously differ from all previously described species of Haplorchoides in possessing clearly and reliably tripartite seminal vesicles...
March 2018: Systematic Parasitology
Ana C Prizon, Daniel P Bruschi, Luciana A Borin-Carvalho, Andréa Cius, Ligia M Barbosa, Henrique B Ruiz, Claudio H Zawadzki, Alberto S Fenocchio, Ana L de Brito Portela-Castro
Only one species of armored catfish, Ancistrus cirrhosus Valenciennes 1836, has been historically described in the basin of the Paraná River, from Misiones (Argentina). However, the ample variation found in the morphology and coloration of the populations sampled in the tributaries of the Brazilian state of Paraná makes it difficult to establish the real taxonomic status and evolutionary history of the Ancistrus specimens, suggesting that A. cirrhosus is not the only species found in this basin. By combining data on mitochondrial DNA (COI gene) and chromosomal markers from different Ancistrus populations, totaling 144 specimens, in the tributaries of the Paraná, and specimens from Misiones (type-locality of A...
2017: Frontiers in Genetics
Kayvan F Tehrani, Yiwen Zhang, Ping Shen, Peter Kner
Stochastic optical reconstruction microscopy (STORM) can achieve resolutions of better than 20nm imaging single fluorescently labeled cells. However, when optical aberrations induced by larger biological samples degrade the point spread function (PSF), the localization accuracy and number of localizations are both reduced, destroying the resolution of STORM. Adaptive optics (AO) can be used to correct the wavefront, restoring the high resolution of STORM. A challenge for AO-STORM microscopy is the development of robust optimization algorithms which can efficiently correct the wavefront from stochastic raw STORM images...
November 1, 2017: Biomedical Optics Express
Keteryne Rodrigues da Silva, Sandra Mariotto, Liano Centofante, Patricia Pasquali Parise-Maltempi
The Tc1 mariner element is widely distributed among organisms and have been already described in different species of fish. The genus Ancistrus (Kner, 1854) has 68 nominal species and is part of an interesting taxonomic and cytogenetic group, as well as presenting a variation of chromosome number, ranging from 2n=34 to 54 chromosomes, and the existence of simple and multiple sex chromosome system and the occurrence of chromosomal polymorphisms involving chromosomes that carry the nucleolus organizer region...
2017: Comparative Cytogenetics
Fábio Hiroshi Takagui, Ana Lucia Dias, José Luís Olivan Birindelli, Ana Claudia Swarça, Renata da Rosa, Roberto Laridondo Lui, Alberto Sergio Fenocchio, Lucia Giuliano-Caetano
The family Doradidae (Siluriformes) is an important group of fishes endemic to freshwater ecosystems in South America. Some cytogenetic studies have been conducted focused on the group; however, there are no reports on the occurrence of B chromosomes for the family. In this paper the chromosomal characteristics of Platydoras armatulus (Valenciennes, 1840), Pterodoras granulosus (Valenciennes, 1821) and Ossancora punctata (Kner, 1855) were investigated through classical cytogenetics approaches. The conventional staining reveals 2n=58 in Platydoras armatulus and Pterodoras granulosus, however with distinct karyotypic formulae, possibly originated by pericentric inversions...
2017: Comparative Cytogenetics
Guilherme Souza, Erica P Caramaschi, Leandro R Monteiro
The aim of this study was to analyse the morphology and allometry of larvae belonging to five potamodromous species. Five breeding species belonging to the order Characiformes [Salminus brasiliensis (Cuvier, 1816), Leporinus steindachneri, Eigenmann, 1907, Prochilodus lineatus (Valenciennes, 1837), Prochilodus vimboides (Kner,1859) and Brycon insignis, Steindachner, 1877] were used to obtain larvae samples during the pre-flexing, post-flexing, and juvenile developmental stages. When we observed the degree-hour (DH) amplitude time values, we found three developmental groups based on allometry and morphometrics within the period between the pre-flexing and post-flexing phases...
July 11, 2017: Zygote: the Biology of Gametes and Early Embryos
Jenna L Wingfield, Ilaria Mengoni, Heather Bomberger, Yu-Yang Jiang, Jonathon D Walsh, Jason M Brown, Tyler Picariello, Deborah A Cochran, Bing Zhu, Junmin Pan, Jonathan Eggenschwiler, Jacek Gaertig, George B Witman, Peter Kner, Karl Lechtreck
Intraflagellar transport (IFT) trains, multimegadalton assemblies of IFT proteins and motors, traffic proteins in cilia. To study how trains assemble, we employed fluorescence protein-tagged IFT proteins in Chlamydomonas reinhardtii . IFT-A and motor proteins are recruited from the cell body to the basal body pool, assembled into trains, move through the cilium, and disperse back into the cell body. In contrast to this 'open' system, IFT-B proteins from retrograde trains reenter the pool and a portion is reused directly in anterograde trains indicating a 'semi-open' system...
May 31, 2017: ELife
Yan Zhou, Abhijit Marar, Peter Kner, Ramaraja P Ramasamy
A new type of carbon nanotube (CNT)-based impedimetric biosensing method has been developed for rapid and selective detection of live bacterial cells. A proof-of-concept study was conducted using T2 bacteriophage-based biosensors for electrochemical detection of Escherichia coli B. The T2 bacteriophage (virus) served as the biorecognition element, which was immobilized on polyethylenimine (PEI)-functionalized carbon nanotube transducer on glassy carbon electrode. Charge-directed, orientated immobilization of bacteriophage particles on carbon nanotubes was achieved through covalent linkage of phage capsid onto the carbon nanotubes...
June 6, 2017: Analytical Chemistry
Kayvan Forouhesh Tehrani, Peter Kner, Luke J Mortensen
Optical aberrations significantly affect the resolution and signal-to-noise ratio of deep tissue microscopy. As multiphoton microscopy is applied deeper into tissue, the loss of resolution and signal due to propagation of light in a medium with heterogeneous refractive index becomes more serious. Efforts in imaging through the intact skull of mice cannot typically reach past the bone marrow ( ? 150 ?? ? m of depth) and have limited resolution and penetration depth. Mechanical bone thinning or optical ablation of bone enables deeper imaging, but these methods are highly invasive and may impact tissue biology...
March 1, 2017: Journal of Biomedical Optics
Clautenes Maria de Almeida Ferreira, Silvia Gonçalves Egler, Allegra Viviane Yallouz, Áurea Regina Alves Ignácio
In this study an environmental assessment of contamination by total mercury (THg) was carried out at the Plateau of the Upper Paraguai River. Total mercury was evaluated in sediment and muscle of the red piranha Pygocentrus nattereri Kner, 1858, a piscivorous species at the top of the food chain consumed for subsistence and commercially. THg concentrations were below national guidelines established by WHO for sediments (100 ng g-1 ) and fish (100-600 ng g-1 ) for most of the sampled sites. Two sites located downstream of artisanal diamond and gold mines had THg concentrations in fish equal or greater than 600 ng g-1 ...
May 2017: Chemosphere
Carlos Henrique Dos A Dos Santos, Carolina S de Sá Leitão, Maria de N Paula-Silva, Vera Maria F Almeida-Val
Red-bellied piranhas (Pygocentrus nattereri) are widely caught with different intensities throughout the region of Solimões-Amazonas River by local fishermen. Thus, the management of this resource is performed in the absence of any information on its genetic stock. P. nattereri is a voracious predator and widely distributed in the Neotropical region, and it is found in other regions of American continent. However, information about genetic variability and structure of wild populations of red-bellied piranha is unavailable...
June 2016: Ecology and Evolution
Manoela M F Marinho, Francisco Langeani
Moenkhausia lepidura (Kner) is redescribed based on the examination of the type and other specimens from several localities of the Amazon and Orinoco basins. The species is readly diagnosed from congeners by a combination of a dark blotch on the upper caudal-fin lobe, lower lobe hyaline, and by the arrangement of predorsal scales, in which scales of anterior portion of predorsal area are arranged in pairs, followed by a single median row of scales extending to dorsal-fin origin. The analysis of the type material of Gymnotichthys hildae Fernández-Yépez and Knodus calliurus Ahl demonstrated the former is a junior synonym of Moenkhausia lepidura, whereas the latter should be removed from its synonymy...
May 3, 2016: Zootaxa
Thomas Huelsnitz, Peter Kner
We propose a microscope that utilizes three high numerical aperture objectives to image a sample from multiple angles, interferometrically combining the fields from each objective to obtain a higher resolution and more isotropic point-spread function than standard wide-field and confocal techniques. The proposed microscope utilizes three 0.9 NA objectives with large working distance and, therefore, has both a large imaging volume and an effective 2.7 NA. The FWHM of the point-spread function is 135 nm in the plane of the objectives, a factor of 2 better than the lateral resolution with a single objective...
February 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
J Aaron Harris, Yi Liu, Pinfen Yang, Peter Kner, Karl F Lechtreck
The microtubule (MT) plus-end tracking protein EB1 is present at the tips of cilia and flagella; end-binding protein 1 (EB1) remains at the tip during flagellar shortening and in the absence of intraflagellar transport (IFT), the predominant protein transport system in flagella. To investigate how EB1 accumulates at the flagellar tip, we used in vivo imaging of fluorescent protein-tagged EB1 (EB1-FP) in Chlamydomonas reinhardtii. After photobleaching, the EB1 signal at the flagellar tip recovered within minutes, indicating an exchange with unbleached EB1 entering the flagella from the cell body...
January 15, 2016: Molecular Biology of the Cell
L A Luz, L L Reis, I Sampaio, M C Barros, E Fraga
AbstractThe red piranha, Pygocentrus nattereri, is an important resource for artisanal and commercial fisheries. The present study determines the genetic differentiation among P. nattereri populations from the northeastern Brazilian state of Maranhão. The DNA was isolated using a standard phenol-chloroform protocol and the Control Region was amplified by PCR. The PCR products were sequenced using the didesoxyterminal method. A sequence of 1039 bps was obtained from the Control Region of 60 specimens, which presented 33 polymorphic sites, 41 haplotypes, һ =0...
November 10, 2015: Brazilian Journal of Biology, Revista Brasleira de Biologia
Donald C Taphorn, Jonathan W Armbruster, Francisco Villa-Navarro, C Keith Ray
We review the trans-Andean species of Ancistrus from Panama, Colombia and Venezuela. Based on analyses of meristic, morphometric and pigmentation pattern data of preserved specimens, eight of sixteen species reported from this region are considered valid and two new species are described. Here we review Ancistrus chagresi Eigenmann & Eigenmann 1889 from both slopes of central Panama; A. centrolepis Regan 1913 from Pacific slopes of eastern Panama and western Colombia; Ancistrus caucanus Fowler 1943, from the Magdalena River drainage in northern Colombia; Ancistrus martini Schultz 1944, from the Lake Maracaibo Basin of Venezuela and Colombia...
2013: Zootaxa
Juan Hu, Yibin Chen, Huihong Zhao, Huirong Yang, Li Liu
The complete mitogenome sequence of Rhodeus ocellatus (Kner) was determined using the next-generation sequencing (NGS). The genome was 16 761 bp in length and contained 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes and a control region. The overall nucleotide composition was 30.43% A, 27.50% T, 25.94% C, and 16.13% G, with an A + T bias of 57.93%. The gene composition and the arrangement of the R. ocellatus mitochondrial genome were similar to that of most other vertebrates...
September 2016: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
Guilherme Souza, Edésio J T Melo, Erica P Caramaschi, Dalcio R Andrade, Leandro R Monteiro
The objective of this study was to characterize the early development and allometric growth of the grumatã (Prochilodus vimboides). We describe a sample of 266 eggs and larvae obtained through induced spawning. The eggs were spherical (mean 3.7 mm diameter), exhibited a yellow yolk and were non-adhesive and pelagic after fertilization and hydration. The time elapsed between the early cleavage and post-flexion stages was considered short (328 hours, 8054 hour-degrees) in regard to the development times of other Neotropical rheophilic species, but time to hatching was considerably longer than in other Prochilodus species...
June 2016: Zygote: the Biology of Gametes and Early Embryos
Kayvan F Tehrani, Jianquan Xu, Yiwen Zhang, Ping Shen, Peter Kner
The resolution of Single Molecule Localization Microscopy (SML) is dependent on the width of the Point Spread Function (PSF) and the number of photons collected. However, biological samples tend to degrade the shape of the PSF due to the heterogeneity of the index of refraction. In addition, there are aberrations caused by imperfections in the optical components and alignment, and the refractive index mismatch between the coverslip and the sample, all of which directly reduce the accuracy of SML. Adaptive Optics (AO) can play a critical role in compensating for aberrations in order to increase the resolution...
May 18, 2015: Optics Express
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"