keyword
MENU ▼
Read by QxMD icon Read
search

Hydra

keyword
https://www.readbyqxmd.com/read/28441559/hydra-imaging-nerve-nets-in-action
#1
Ni Ji, Steven W Flavell
Mapping whole-brain activity during behavior represents one of the biggest and most exciting challenges of systems neuroscience. New research has taken advantage of the unique biology of an ancient organism to bring us a step closer to that goal.
April 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28416816/scalable-electrophysiology-in-intact-small-animals-with-nanoscale-suspended-electrode-arrays
#2
Daniel L Gonzales, Krishna N Badhiwala, Daniel G Vercosa, Benjamin W Avants, Zheng Liu, Weiwei Zhong, Jacob T Robinson
Electrical measurements from large populations of animals would help reveal fundamental properties of the nervous system and neurological diseases. Small invertebrates are ideal for these large-scale studies; however, patch-clamp electrophysiology in microscopic animals typically requires invasive dissections and is low-throughput. To overcome these limitations, we present nano-SPEARs: suspended electrodes integrated into a scalable microfluidic device. Using this technology, we have made the first extracellular recordings of body-wall muscle electrophysiology inside an intact roundworm, Caenorhabditis elegans...
April 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28411398/bud-detachment-in-hydra-requires-activation-of-fgfr-and-a-rho-rock-myosin-ii-signaling-pathway-to-ensure-formation-of-a-basal-constriction
#3
Oliver Holz, David Apel, Patrick Steinmetz, Ellen Lange, Simon Hopfenmüller, Kerstin Ohler, Stefanie Sudhop, Monika Hassel
BACKGROUND: Hydra propagates asexually by exporting tissue into a bud, which detaches four days later as a fully differentiated young polyp. Prerequisite for detachment is activation of fibroblast growth factor receptor (FGFR) signaling. The mechanism which enables constriction and tissue separation within the monolayered ecto- and endodermal epithelia is unknown. RESULTS: Histological sections and staining of F-actin by phalloidin revealed conspicuous cell shape changes at the bud detachment site indicating a localized generation of mechanical forces and the potential enhancement of secretory functions in ectodermal cells...
April 15, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28366745/non-overlapping-neural-networks-in-hydra-vulgaris
#4
Christophe Dupre, Rafael Yuste
To understand the emergent properties of neural circuits, it would be ideal to record the activity of every neuron in a behaving animal and decode how it relates to behavior. We have achieved this with the cnidarian Hydra vulgaris, using calcium imaging of genetically engineered animals to measure the activity of essentially all of its neurons. Although the nervous system of Hydra is traditionally described as a simple nerve net, we surprisingly find instead a series of functional networks that are anatomically non-overlapping and are associated with specific behaviors...
April 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28341397/degradation-of-textile-dyes-by-cyanobacteria
#5
Priscila Maria Dellamatrice, Maria Estela Silva-Stenico, Luiz Alberto Beraldo de Moraes, Marli Fátima Fiore, Regina Teresa Rosim Monteiro
Dyes are recalcitrant compounds that resist conventional biological treatments. The degradation of three textile dyes (Indigo, RBBR and Sulphur Black), and the dye-containing liquid effluent and solid waste from the Municipal Treatment Station, Americana, São Paulo, Brazil, by the cyanobacteria Anabaena flos-aquae UTCC64, Phormidium autumnale UTEX1580 and Synechococcus sp. PCC7942 was evaluated. The dye degradation efficiency of the cyanobacteria was compared with anaerobic and anaerobic-aerobic systems in terms of discolouration and toxicity evaluations...
January 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28331473/mossy-fiber-sprouting-in-the-epileptic-brain-taking-on-the-lernaean-hydra
#6
Steve Danzer
No abstract text is available yet for this article.
January 2017: Epilepsy Currents
https://www.readbyqxmd.com/read/28248594/dissecting-common-and-divergent-molecular-pathways-elicited-by-cdse-zns-quantum-dots-in-freshwater-and-marine-sentinel-invertebrates
#7
Alfredo Ambrosone, Modi Roopin, Beatriz Pelaz, Abuelmagd M Abdelmonem, Lisa-Maria Ackermann, Lucia Mattera, Mariateresa Allocca, Angela Tino, Markus Klapper, Wolfgang J Parak, Oren Levy, Claudia Tortiglione
Water ecosystems represent main targets of unintentional contamination of nanomaterials, due to industrial waste or other anthropogenic activities. Nanoparticle insult to living organisms may occur in a sequential way, first by chemical interactions of the material with the target membrane, then by progressive internalisation and interaction with cellular structures and organelles. These events trigger a signal transduction, through which cells modulate molecular pathway in order to respond and survive to the external elicitation...
March 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28222982/ecotoxicological-assessment-of-cobalt-using-hydra-model-ros-oxidative-stress-dna-damage-cell-cycle-arrest-and-apoptosis-as-mechanisms-of-toxicity
#8
Mohammed Zeeshan, Anbazhagan Murugadas, Surendra Ghaskadbi, Babu Rajendran Ramaswamy, Mohammad Abdulkader Akbarsha
The mechanisms underlying cobalt toxicity in aquatic species in general and cnidarians in particular remain poorly understood. Herein we investigated cobalt toxicity in a Hydra model from morphological, histological, developmental, and molecular biological perspectives. Hydra, exposed to cobalt (0-60 mg/L), were altered in morphology, histology, and regeneration. Exposure to standardized sublethal doses of cobalt impaired feeding by affecting nematocytes, which in turn affected reproduction. At the cellular level, excessive ROS generation, as the principal mechanism of action, primarily occurred in the lysosomes, which was accompanied by the upregulation of expression of the antioxidant genes SOD, GST, GPx, and G6PD...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28187896/hydra-a-web-based-system-for-cardiovascular-analysis-diagnosis-and-treatment
#9
J Novo, A Hermida, M Ortega, N Barreira, M G Penedo, J E López, C Calvo
BACKGROUND AND OBJECTIVE: Cardiovascular (CV) risk stratification is a highly complex process involving an extensive set of clinical trials to support the clinical decision-making process. There are many clinical conditions (e.g. diabetes, obesity, stress, etc.) that can lead to the early diagnosis or establishment of cardiovascular disease. In order to determine all these clinical conditions, a complete set of clinical patient analyses is typically performed, including a physical examination, blood analysis, electrocardiogram, blood pressure (BP) analysis, etc...
February 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28185543/an-atlas-of-annotations-of-hydra-vulgaris-transcriptome
#10
Daniela Evangelista, Kumar Parijat Tripathi, Mario Rosario Guarracino
BACKGROUND: RNA sequencing takes advantage of the Next Generation Sequencing (NGS) technologies for analyzing RNA transcript counts with an excellent accuracy. Trying to interpret this huge amount of data in biological information is still a key issue, reason for which the creation of web-resources useful for their analysis is highly desiderable. RESULTS: Starting from a previous work, Transcriptator, we present the Atlas of Hydra's vulgaris, an extensible web tool in which its complete transcriptome is annotated...
September 22, 2016: BMC Bioinformatics
https://www.readbyqxmd.com/read/28178519/structural-inheritance-of-the-actin-cytoskeletal-organization-determines-the-body-axis-in-regenerating-hydra
#11
Anton Livshits, Lital Shani-Zerbib, Yonit Maroudas-Sacks, Erez Braun, Kinneret Keren
Understanding how mechanics complement bio-signaling in defining patterns during morphogenesis is an outstanding challenge. Here, we utilize the multicellular polyp Hydra to investigate the role of the actomyosin cytoskeleton in morphogenesis. We find that the supra-cellular actin fiber organization is inherited from the parent Hydra and determines the body axis in regenerating tissue segments. This form of structural inheritance is non-trivial because of the tissue folding and dynamic actin reorganization involved...
February 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28134991/the-parthenocarpic-hydra-mutant-reveals-a-new-function-for-a-sporocyteless-like-gene-in-the-control-of-fruit-set-in-tomato
#12
Pilar Rojas-Gracia, Edelin Roque, Mónica Medina, Maricruz Rochina, Rim Hamza, María Pilar Angarita-Díaz, Vicente Moreno, Fernando Pérez-Martín, Rafael Lozano, Luis Cañas, José Pío Beltrán, Concepción Gómez-Mena
Fruit set is an essential process to ensure successful sexual plant reproduction. The development of the flower into a fruit is actively repressed in the absence of pollination. However, some cultivars from a few species are able to develop seedless fruits overcoming the standard restriction of unpollinated ovaries to growth. We report here the identification of the tomato hydra mutant that produces seedless (parthenocarpic) fruits. Seedless fruit production in hydra plants is linked to the absence of both male and female sporocyte development...
January 30, 2017: New Phytologist
https://www.readbyqxmd.com/read/28117771/inducing-complete-polyp-regeneration-from-the-aboral-physa-of-the-starlet-sea-anemone-nematostella-vectensis
#13
Patricia Bossert, Gerald H Thomsen
Cnidarians, and specifically Hydra, were the first animals shown to regenerate damaged or severed structures, and indeed such studies arguably launched modern biological inquiry through the work of Trembley more than 250 years ago. Presently the study of regeneration has seen a resurgence using both "classic" regenerative organisms, such as the Hydra, planaria and Urodeles, as well as a widening spectrum of species spanning the range of metazoa, from sponges through mammals. Besides its intrinsic interest as a biological phenomenon, understanding how regeneration works in a variety of species will inform us about whether regenerative processes share common features and/or species or context-specific cellular and molecular mechanisms...
January 14, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28078622/evidence-that-polycystins-are-involved-in-hydra-cnidocyte-discharge
#14
Susan McLaughlin
Like other cnidarians, the freshwater organism Hydra is characterized by the possession of cnidocytes (stinging cells). Most cnidocytes are located on hydra tentacles, where they are organized along with sensory cells and ganglion cells into battery complexes. The function of the battery complexes is to integrate multiple types of stimuli for the regulation of cnidocyte discharge. The molecular mechanisms controlling the discharge of cnidocytes are not yet fully understood, but it is known that discharge depends on extracellular Ca(2+) and that mechanically induced cnidocyte discharge can be enhanced by the presence of prey extracts and other chemicals...
March 2017: Invertebrate Neuroscience: IN
https://www.readbyqxmd.com/read/28069433/dual-recognition-activity-of-a-rhamnose-binding-lectin-to-pathogenic-bacteria-and-zooxanthellae-in-stony-coral-pocillopora-damicornis
#15
Zhi Zhou, Xiaopeng Yu, Jia Tang, Yunjie Zhu, Guangmei Chen, Liping Guo, Bo Huang
Rhamnose-binding lectin (RBL) is a type of Ca(2+)-independent lectin with tandem repeat carbohydrate-recognition domain, and is crucial for the innate immunity in many invertebrates. In this study, the cDNA sequence encoding RBL in coral Pocillopora damicornis (PdRBL-1) was cloned. The PdRBL-1 protein shared highest amino acid sequence similarity (55%) with the polyp of Hydra vulgaris, and contained a signal peptide and two tandem carbohydrate-recognition domains in which all cysteine residues were conserved...
January 7, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28057045/validation-of-a-new-method-for-the-endoscopic-measurement-of-post-bariatric-gastric-outlet-using-a-standard-guidewire-an-observer-agreement-study
#16
Luiz Gustavo de Quadros, Manoel Dos Passos Galvão Neto, Josemberg Marins Campos, Roberto Luiz Kaiser Junior, Eduardo Grecco, Mario Flamini Junior, Marcelo Falcao de Santana, Idiberto Jose Zotarelli Filho, Adriano Augusto Tomas Vasconcelos Almeida Alexandre
BACKGROUND AND AIMS: Between 10 and 20% of all patients undergoing bariatric surgery procedures regain weight secondary to a gastrojejunostomy enlargement. The aim of this study was to validate the interobserver agreement while measuring gastric outlet diameters using a new standard guidewire. METHODS: We selected thirty-five videos of consecutive endoscopic procedures on patients undergoing esophagogastroduodenoscopy after a Roux-en-Y gastric bypass procedure. All videos were evaluated by four raters: two expert endoscopists and two trainees...
January 3, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28012975/prey-dynamics-under-generalist-predator-culling-in-stage-structured-models
#17
Michel Iskin da S Costa, Pedro V Esteves, Lucas Del Bianco Faria, Lucas Dos Anjos
In this paper, by means of mathematical dynamical models we investigate the impacts of predator culling on a prey population structured in two stage classes, juveniles and adults, assuming stage specific predation by two generalist predators with functional responses types 2 and 3 in all possible combinations. According to the chosen set of parameter values, these impacts can manifest through possible demographic Allee effects, sustained population oscillations, alternative stable states (e.g., predator-pit-like behavior) and Hydra effect, which are all discussed, in turn, in terms of species conservation, harvest yield and pest biological control...
December 21, 2016: Mathematical Biosciences
https://www.readbyqxmd.com/read/27995409/the-hydra-regeneration-assay-reveals-ecological-risks-in-running-waters-a-new-proposal-to-detect-environmental-teratogenic-threats
#18
Lorenzo Traversetti, Floriano Del Grosso, Valentina Malafoglia, Marco Colasanti, Simona Ceschin, Stefano Larsen, Massimiliano Scalici
The regenerative ability of Hydra vulgaris was tested as potential biomarker for the development of a new eco-toxicological index. The test is based on the regeneration rate and the aberration frequency of the columna (body and adhesive foot) after separation from head and tentacles by a bistoury. Particularly, 45 columnae were submerged in the rearing solution (that is Hydra medium) to have control, and 285 in potential contaminated waters to have treatments, collected from 19 sites along 10 rivers in central Italy...
March 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27941639/evolution-of-the-cytolytic-pore-forming-proteins-actinoporins-in-sea-anemones
#19
Jason Macrander, Marymegan Daly
Sea anemones (Cnidaria, Anthozoa, and Actiniaria) use toxic peptides to incapacitate and immobilize prey and to deter potential predators. Their toxin arsenal is complex, targeting a variety of functionally important protein complexes and macromolecules involved in cellular homeostasis. Among these, actinoporins are one of the better characterized toxins; these venom proteins form a pore in cellular membranes containing sphingomyelin. We used a combined bioinformatic and phylogenetic approach to investigate how actinoporins have evolved across three superfamilies of sea anemones (Actinioidea, Metridioidea, and Actinostoloidea)...
December 8, 2016: Toxins
https://www.readbyqxmd.com/read/27803185/the-origin-of-mucosal-immunity-lessons-from-the-holobiont-hydra
#20
REVIEW
Katja Schröder, Thomas C G Bosch
Historically, mucosal immunity-i.e., the portion of the immune system that protects an organism's various mucous membranes from invasion by potentially pathogenic microbes-has been studied in single-cell epithelia in the gastrointestinal and upper respiratory tracts of vertebrates. Phylogenetically, mucosal surfaces appeared for the first time about 560 million years ago in members of the phylum Cnidaria. There are remarkable similarities and shared functions of mucosal immunity in vertebrates and innate immunity in cnidarians, such as Hydra species...
November 1, 2016: MBio
keyword
keyword
86058
1
2
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"