keyword
MENU ▼
Read by QxMD icon Read
search

Octopus

keyword
https://www.readbyqxmd.com/read/28319020/in%C3%A2-vitro-preparation-and-assessment-of-radical-reducing-peptide-from-octopus-aegina-using-digestive-proteases
#1
Sekar Sudhakar, Rasool Abdul Nazeer
Antioxidant peptides protect biological macromolecules against radical damages. The use of these peptides was evaluated using free radicals scavenging assays [2,2-diphenyl-1 picrylhydrazyl (DPPH) and hydroxyl] with the help of UV-visible and electron spin resonance (ESR) spectroscopy methods. The Octopus aegina mantle protein were tested upon hydrolysis using gastrointestinal enzymes up to 12 h, where pepsin hydrolysate exhibited superior properties (DPPH: 44.39±0.67% and hydroxyl: 38.84±1.07%) compared with trypsin and α-chymotrypsin...
March 16, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28315141/magnetoelastic-instability-in-soft-thin-films
#2
M Poty, F Weyer, G Grosjean, G Lumay, N Vandewalle
Ferromagnetic particles are incorporated in a thin soft elastic matrix. A lamella, made of this smart material, is studied experimentally and modeled. We show herein that thin films can be actuated using an external magnetic field applied through the system. The system is found to be switchable since subcritical pitchfork bifurcation is discovered in the beam shape when the magnetic field orientation is modified. Strong magnetoelastic effects can be obtained depending on both field strength and orientation...
March 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28298896/spotmetrics-an-open-source-image-analysis-software-plugin-for-automatic-chromatophore-detection-and-measurement
#3
Stavros P Hadjisolomou, George El-Haddad
Coleoid cephalopods (squid, octopus, and sepia) are renowned for their elaborate body patterning capabilities, which are employed for camouflage or communication. The specific chromatic appearance of a cephalopod, at any given moment, is a direct result of the combined action of their intradermal pigmented chromatophore organs and reflecting cells. Therefore, a lot can be learned about the cephalopod coloration system by video recording and analyzing the activation of individual chromatophores in time. The fact that adult cephalopods have small chromatophores, up to several hundred thousand in number, makes measurement and analysis over several seconds a difficult task...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28272991/risk-estimation-to-human-health-caused-by-the-mercury-content-of-sushi-and-sashimi-sold-in-japanese-restaurants-in-brazil
#4
Jeanne Clécia Alves, Esther Lima de Paiva, Raquel Fernanda Milani, Eduardo Bearzoti, Marcelo Antonio Morgano, Késia Diego Quintaes
Although fish is a healthy alternative for meat, it can be a vehicle for mercury (Hg), including in its most toxic organic form, methylmercury (MeHg). The objective of the present study was to estimate the risk to human health caused by the consumption of sushi and sashimi as commercialized by Japanese food restaurants in the city of Campinas (SP, Brazil). The total Hg content was determined by atomic absorption spectrometry with thermal decomposition and amalgamation, and the MeHg content calculated considering that 90% of the total Hg is in the organic form...
March 8, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28263544/smart-actuators-and-adhesives-for-reconfigurable-matter
#5
Hyunhyub Ko, Ali Javey
Biological systems found in nature provide excellent stimuli-responsive functions. The camouflage adaptation of cephalopods (octopus, cuttlefish), rapid stiffness change of sea cucumbers, opening of pine cones in response to humidity, and rapid closure of Venus flytraps upon insect touch are some examples of nature's smart systems. Although current technologies are still premature to mimic these sophisticated structures and functions in smart biological systems, recent work on stimuli-responsive programmable matter has shown great progress...
March 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28251828/enriched-environment-increases-pcna-and-parp1-levels-in-octopus-vulgaris-central-nervous-system-first-evidence-of-adult-neurogenesis-in-lophotrochozoa
#6
Carla Bertapelle, Gianluca Polese, Anna Di Cosmo
Organisms showing a complex and centralized nervous system, such as teleosts, amphibians, reptiles, birds and mammals, and among invertebrates, crustaceans and insects, can adjust their behavior according to the environmental challenges. Proliferation, differentiation, migration, and axonal and dendritic development of newborn neurons take place in brain areas where structural plasticity, involved in learning, memory, and sensory stimuli integration, occurs. Octopus vulgaris has a complex and centralized nervous system, located between the eyes, with a hierarchical organization...
March 2, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28250188/molecular-clocks-indicate-turnover-and-diversification-of-modern-coleoid-cephalopods-during-the-mesozoic-marine-revolution
#7
Alastair R Tanner, Dirk Fuchs, Inger E Winkelmann, M Thomas P Gilbert, M Sabrina Pankey, Ângela M Ribeiro, Kevin M Kocot, Kenneth M Halanych, Todd H Oakley, Rute R da Fonseca, Davide Pisani, Jakob Vinther
Coleoid cephalopod molluscs comprise squid, cuttlefish and octopuses, and represent nearly the entire diversity of modern cephalopods. Sophisticated adaptations such as the use of colour for camouflage and communication, jet propulsion and the ink sac highlight the unique nature of the group. Despite these striking adaptations, there are clear parallels in ecology between coleoids and bony fishes. The coleoid fossil record is limited, however, hindering confident analysis of the tempo and pattern of their evolution...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28250097/grasping-with-a-soft-glove-intrinsic-impedance-control-in-pneumatic-actuators
#8
P Paoletti, G W Jones, L Mahadevan
The interaction of a robotic manipulator with unknown soft objects represents a significant challenge for traditional robotic platforms because of the difficulty in controlling the grasping force between a soft object and a stiff manipulator. Soft robotic actuators inspired by elephant trunks, octopus limbs and muscular hydrostats are suggestive of ways to overcome this fundamental difficulty. In particular, the large intrinsic compliance of soft manipulators such as 'pneu-nets'-pneumatically actuated elastomeric structures-makes them ideal for applications that require interactions with an uncertain mechanical and geometrical environment...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28248970/an-eocene-orthocone-from-antarctica-shows-convergent-evolution-of-internally-shelled-cephalopods
#9
Larisa A Doguzhaeva, Stefan Bengtson, Marcelo A Reguero, Thomas Mörs
BACKGROUND: The Subclass Coleoidea (Class Cephalopoda) accommodates the diverse present-day internally shelled cephalopod mollusks (Spirula, Sepia and octopuses, squids, Vampyroteuthis) and also extinct internally shelled cephalopods. Recent Spirula represents a unique coleoid retaining shell structures, a narrow marginal siphuncle and globular protoconch that signify the ancestry of the subclass Coleoidea from the Paleozoic subclass Bactritoidea. This hypothesis has been recently supported by newly recorded diverse bactritoid-like coleoids from the Carboniferous of the USA, but prior to this study no fossil cephalopod indicative of an endochochleate branch with an origin independent from subclass Bactritoidea has been reported...
2017: PloS One
https://www.readbyqxmd.com/read/28247020/immunohistochemical-and-biochemical-evidence-for-the-presence-of-serotonin-containing-neurons-and-nerve-fibers-in-the-octopus-arm
#10
Jean-Pierre Bellier, Yu Xie, Sameh Mohamed Farouk, Yuko Sakaue, Ikuo Tooyama, Hiroshi Kimura
The octopus arm contains a tridimensional array of muscles with a massive sensory-motor system. We herein provide the first evidence for the existence of serotonin (5-HT) in the octopus arm nervous system and investigated its distribution using immunohistochemistry. 5-HT-like immunoreactive (5-HT-lir) nerve cell bodies were exclusively localized in the cellular layer of the axial nerve cord. Those cell bodies emitted 5-HT-lir nerve fibers in the direction of the sucker, the intramuscular nerves cords, the ganglion of the sucker, and the intrinsic musculature...
February 28, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28223940/reconsideration-of-serial-visual-reversal-learning-in-octopus-octopus-vulgaris-from-a-methodological-perspective
#11
Alexander Bublitz, Severine R Weinhold, Sophia Strobel, Guido Dehnhardt, Frederike D Hanke
Octopuses (Octopus vulgaris) are generally considered to possess extraordinary cognitive abilities including the ability to successfully perform in a serial reversal learning task. During reversal learning, an animal is presented with a discrimination problem and after reaching a learning criterion, the signs of the stimuli are reversed: the former positive becomes the negative stimulus and vice versa. If an animal improves its performance over reversals, it is ascribed advanced cognitive abilities. Reversal learning has been tested in octopus in a number of studies...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28208072/identification-of-triosephosphate-isomerase-as-a-novel-allergen-in-octopus-fangsiao
#12
Yang Yang, Zhong-Wei Chen, Barry K Hurlburt, Gui-Ling Li, Yong-Xia Zhang, Dan-Xia Fei, Hai-Wang Shen, Min-Jie Cao, Guang-Ming Liu
Octopus is an important mollusk in human dietary for its nutritional value, however it also causes allergic reactions in humans. Major allergens from octopus have been identified, while the knowledge of novel allergens remains poor. In the present study, a novel allergen with molecular weight of 28kDa protein was purified from octopus (Octopus fangsiao) and identified as triosephosphate isomerase (TIM) by mass spectrometry. TIM aggregated beyond 45°C, and its IgE-binding activity was affected under extreme pH conditions due to the altered secondary structure...
February 13, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28207707/fossil-octopus-is-a-jurassic-jewel
#13
Brian Switek
No abstract text is available yet for this article.
February 14, 2017: Scientific American
https://www.readbyqxmd.com/read/28205342/functional-benefits-and-patient-satisfaction-with-upper-blepharoplasty-evaluated-by-objective-and-subjective-outcome-measures
#14
Agnes Galbo Jacobsen, Brian Brost, Henrik Vorum, Janos Hargitai
PURPOSE: To investigate the functional benefits and patient satisfaction with upper blepharoplasty in patients meeting the Danish visitation guidelines for upper blepharoplasty from the Danish Health and Medicines Authority (Sundhedsstyrelsen). METHODS: Before and 3 months after upper blepharoplasty, the following investigations were made: (i) a standard eye examination, (ii) photographic documentation with a normal camera and the infrared camera of a Spectralis Optical Coherence Tomograph and (iii) measurements of the upper visual fields using the blepharoptosis test of Octopus 900...
February 15, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28169920/relationship-between-oct-angiography-temporal-peripapillary-vessel-density-and-octopus-perimeter-paracentral-cluster-mean-defect
#15
Gábor Holló
PURPOSE OF THE STUDY: The purpose of the study was to investigate the relationship between optical coherence tomography angiography angioflow vessel-density (PAFD) measured in the retinal nerve fiber layer in the temporal peripapillary sector and the average of the spatially corresponding superior and inferior paracentral cluster mean defect values (mean paracentral MD) measured with Octopus perimetry. MATERIALS AND METHODS: Spaerman's correlation between temporal peripapillary PAFD acquired with the Angiovue OCT and mean paracentral MD measured with the Normal and tendency-oriented perimetry strategy of Octopus G2 perimetry, respectively, was determined on 1 eye of 13 healthy participants, 22 medically controlled ocular hypertensive, and 27 stable early to moderate glaucoma patients...
February 6, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28152106/relationship-between-optical-coherence-tomography-sector-peripapillary-angioflow-density-and-octopus-visual-field-cluster-mean-defect-values
#16
Gábor Holló
PURPOSE: To compare the relationship of Octopus perimeter cluster mean-defect (cluster MD) values with the spatially corresponding optical coherence tomography (OCT) sector peripapillary angioflow vessel-density (PAFD) and sector retinal nerve fiber layer thickness (RNFLT) values. METHODS: High quality PAFD and RNFLT images acquired on the same day with the Angiovue/RTVue-XR Avanti OCT (Optovue Inc., Fremont, USA) on 1 eye of 27 stable early-to-moderate glaucoma, 22 medically controlled ocular hypertensive and 13 healthy participants were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28140363/hybrid-parameter-identification-of-a-multi-modal-underwater-soft-robot
#17
F Giorgio-Serchi, A Arienti, F Corucci, M Giorelli, C Laschi
We introduce an octopus-inspired, underwater, soft-bodied robot capable of performing waterborne pulsed-jet propulsion and benthic legged-locomotion. This vehicle consists for as much as 80% of its volume of rubber-like materials so that structural flexibility is exploited as a key element during both modes of locomotion. The high bodily softness, the unconventional morphology and the non-stationary nature of its propulsion mechanisms require dynamic characterization of this robot to be dealt with by ad hoc techniques...
February 28, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28117076/oct-angiography-of-acute-non-arteritic-anterior-ischemic-optic-neuropathy
#18
M-B Rougier, M-N Delyfer, J-F Korobelnik
PURPOSE: To describe changes of the retinal peripapillary microvasculature on optical coherence tomography angiography (OCT-A) in non-arteritic anterior ischemic optic (NAION) neuropathy. METHODS: Observational study of 10 patients at the acute phase of NAION. OCT-A was performed using a 3mm×3mm square centered on the optic disc (Cirrus HD-OCT with Angioplex, Carl Zeiss Meditec, Dublin, CA). A qualitative comparison was made with the healthy fellow eye of each patient...
February 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28114587/transcorneal-electrical-stimulation-for-patients-with-retinitis-pigmentosa-a-prospective-randomized-sham-controlled-follow-up-study-over-1-year
#19
Andreas Schatz, Johanna Pach, Mariya Gosheva, Lubka Naycheva, Gabriel Willmann, Barbara Wilhelm, Tobias Peters, Karl Ulrich Bartz-Schmidt, Eberhart Zrenner, André Messias, Florian Gekeler
Purpose: After promising results of an exploratory study, this study was designed to assess the safety and efficacy of transcorneal electrical stimulation (TES) over 1 year in patients with retinitis pigmentosa (RP). Methods: We included 52 RP patients in this prospective, randomized, partially-masked study which was done in accordance with rules of good clinical practice. Transcorneal electrical stimulation by Okustim was applied monocularly for 30 minutes per week for 52 consecutive weeks...
January 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28108174/experimental-infection-of-octopus-vulgaris-cuvier-1797-with-photobacterium-damsela-subsp-piscicida-immunohistochemical-tracking-of-antigen-and-tissue-responses
#20
Vasileios Bakopoulos, Daniella White, Michail-Aggelos Valsamidis, Feli Vasilaki
Adult common octopus individuals were intramuscularly infected with Photobacterium damsela subsp. piscicida in order to investigate if this species is sensitive to this common and important fish pathogen. The fate of the bacterial antigens and the tissue responses of Octopus vulgaris were studied employing immunohistochemical techniques. Strong reaction at the site of injection was evident from day 2 post-infection that continued until day 14. Great numbers of hemocytes that were attracted at the site of infection were involved in phagocytosis of bacteria...
March 2017: Journal of Invertebrate Pathology
keyword
keyword
66105
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"