66 results match your criteria suction disk


Numerical Analysis of Thermal Radiative Maxwell Nanofluid Flow Over-Stretching Porous Rotating Disk.

Micromachines (Basel) 2021 May 10;12(5). Epub 2021 May 10.

Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia.

The fluid flow over a rotating disk is critically important due to its application in a broad spectrum of industries and engineering and scientific fields. In this article, the traditional swirling flow of Von Karman is optimized for Maxwell fluid over a porous spinning disc with a consistent suction/injection effect. Buongiorno's model, which incorporates the effect of both thermophoresis and Brownian motion, describes the Maxwell nanofluid nature. Read More

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Bendy to the bone: Links between vertebral morphology and waterfall climbing in amphidromous gobioid fishes.

J Anat 2021 Apr 29. Epub 2021 Apr 29.

Department of Biological Sciences, Clemson University, Clemson, SC, USA.

Locomotor force production imposes strong demands on organismal form. Thus, the evolution of novel locomotor modes is often associated with morphological adaptations that help to meet those demands. In the goby lineage of fishes, most species are marine and use their fused pelvic fins to facilitate station holding in wave-swept environments. Read More

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Habitat influences skeletal morphology and density in the snailfishes (family Liparidae).

Front Zool 2021 Apr 16;18(1):16. Epub 2021 Apr 16.

Howard University, Washington, DC, 20059, USA.

We tested the hypothesis that deep-sea fishes have poorly mineralized bone relative to shallower-dwelling species using data from a single family that spans a large depth range. The family Liparidae (snailfishes, Cottiformes) has representatives across the entire habitable depth range for bony fishes (0 m-> 8000 m), making them an ideal model for studying depth-related trends in a confined phylogeny. We used micro-computed tomography (micro-CT) scanning to test three aspects of skeletal reduction in snailfishes (50 species) across a full range of habitat depths: 1) reduction of structural dimensions, 2) loss of skeletal elements, and 3) reduction in bone density. Read More

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Application of response surface methodology on the nanofluid flow over a rotating disk with autocatalytic chemical reaction and entropy generation optimization.

Sci Rep 2021 Feb 17;11(1):4021. Epub 2021 Feb 17.

Department of Mathematics, Huzhou University, Huzhou, 313000, People's Republic of China.

The role of nanofluids is of fundamental significance in the cooling process of small electronic devices including microchips and other associated gadgets in microfluidics. With such astounding applications of nanofluids in mind, it is intended to examine the flow of magnetohydrodynamic nanofluid comprising a novel combination of multi-walled carbon nanotubes and engine oil over a stretched rotating disk. The concentration equation is modified by considering the autocatalytic chemical reaction. Read More

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February 2021

Experimental Investigation of the Effect of Purge Flow and Main Flow Interaction in a Low-Speed Turbine Cascade Passage.

Entropy (Basel) 2020 Jun 4;22(6). Epub 2020 Jun 4.

School of Energy and Power Engineering, Beihang University, Beijing 100191, China.

In order to protect the vulnerable turbine components from extreme high temperature, coolant flow is introduced from the compressor to the disk cavity, inevitably interacting with the main flow. This paper describes an experimental investigation of the interaction between the main flow and the purge flow in a low-speed turbine cascade with three purge flow rates, Cm = 0, Cm = 1%, and Cm = 2%. In order to study the effect of the interaction between the main flow and the purge flow on the secondary flows, a Rortex method developed by Liu Chaoquan is introduced to identify the vortex in the flow field. Read More

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Microvascular changes in macula and optic nerve head after femtosecond laser-assisted LASIK: an optical coherence tomography angiography study.

BMC Ophthalmol 2020 Mar 17;20(1):107. Epub 2020 Mar 17.

Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106 Zhongshan Er Road, Guangzhou, 510080, China.

Background: To measure the microcirculation change of macula and optic nerve head before and after femtosecond laser assisted laser in situ keratomileusis.

Methods: In total 45 eyes from 45 subjects, who underwent FS-LASIK during June 2017 to December 2017 in Guangdong Provincial People's Hospital, were recruited in this study. Vessel density in macula and optic nerve head were measured by optical coherence tomography angiography before and after transient elevation in intraocular pressure caused by application of suction ring during surgery. Read More

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Transient effect of suction on the retinal neurovasculature in myopic patients after small-incision lenticule extraction.

J Cataract Refract Surg 2020 02;46(2):250-259

Ophthalmic Center, the Second Affiliated Hospital of Guangzhou Medical University (Liu, Zeng, Zou, Zheng, Luo, Sha, Liu), Department of Ophthalmology, the Sixth Affiliated Hospital of Guangzhou Medical University (Liu), Qingyuan, China; and Bascom Palmer Eye Institute, University of Miami Miller School of Medicine (Tonk, Huang, Han, Karp), Miami, Florida, USA.

Purpose: To characterize retinal neurovasculature changes after small-incision lenticule extraction (SMILE) in myopic patients.

Setting: Ophthalmic Center, the Second Affiliated Hospital of Guangzhou Medical University, China.

Design: Prospective interventional study. Read More

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February 2020

Comparison of various surgical techniques for optic disc pit maculopathy: vitrectomy with internal limiting membrane (ILM) peeling alone versus inverted ILM flap 'plug' versus autologous scleral 'plug'.

Br J Ophthalmol 2020 11 6;104(11):1567-1573. Epub 2020 Feb 6.

Vitreo-retinal Services, Aravind Eye Hospital, Madurai, India.

Aim: To compare the anatomical and visual outcomes of vitrectomy with internal limiting membrane (ILM) peeling alone versus inverted ILM flap to plug the pit versus autologous scleral plug for the treatment of optic disc pit maculopathy (ODP-M).

Methods: This retrospective study included 23 patients (23 eyes) who underwent 25G pars plana vitrectomy, ILM peeling and gas tamponade. While the pit was not plugged in group 1 (n=8), inverted ILM flap and autologous scleral flap were used to plug the pit in group 2 (n=7) and group 3 (n=8), respectively. Read More

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November 2020

Remora-Inspired Reversible Adhesive for Underwater Applications.

ACS Appl Mater Interfaces 2019 Dec 4;11(50):47571-47576. Epub 2019 Dec 4.

Department of Mechanical Engineering , Kyungpook National University , Daegu 41566 , Republic of Korea.

The remoras are marine species that can effectively move by clinging onto other marine species via a suction disk on their dorsal side, which is composed of complex structures. The inner suction disk could be divided into three large parts, namely, lip, lamella, and spinule. The lamella is deformed actively to generate pressure difference between the inside and outside of the suction disk, and the lip maintains the sealing. Read More

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December 2019

Specialized landing maneuvers in Spix's disk-winged bats () reveal linkage between roosting ecology and landing biomechanics.

J Exp Biol 2019 10 16;222(Pt 20). Epub 2019 Oct 16.

Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02906, USA.

Disk-winged bats ( spp.) are the only mammals that use suction to cling to smooth surfaces, having evolved suction cups at the bases of the thumbs and feet that facilitate attachment to specialized roosts: the protective funnels of ephemeral furled leaves. We predicted that this combination of specialized morphology and roosting ecology is coupled with concomitantly specialized landing maneuvers. Read More

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October 2019

Antifungal Susceptibility and Biofilm Production of spp. Isolated from Clinical Samples.

Int J Microbiol 2018 10;2018:7495218. Epub 2018 Oct 10.

Department of Microbiology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India.

Objective: The study aims to speciate clinical isolates and detect their biofilm-forming ability and antifungal resistance.

Methods: All the spp. isolated from different clinical samples like pus, urine, blood, and body fluid were included in the study. Read More

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October 2018

Transpiration and Viscous Dissipation Effects on Entropy Generation in Hybrid Nanofluid Flow over a Nonlinear Radially Stretching Disk.

Entropy (Basel) 2018 Sep 4;20(9). Epub 2018 Sep 4.

Department of Mathematics, Faculty of Science, Jiangsu University, Zhenjiang 212013, China.

The present research work explores the effects of suction/injection and viscous dissipation on entropy generation in the boundary layer flow of a hybrid nanofluid (Cu-AlO-HO) over a nonlinear radially stretching porous disk. The energy dissipation function is added in the energy equation in order to incorporate the effects of viscous dissipation. The Tiwari and Das model is used in this work. Read More

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September 2018

An original valveless artificial heart providing pulsatile flow tested in mock circulatory loops.

Int J Artif Organs 2017 Nov 11;40(12):683-689. Epub 2017 Aug 11.

 Laboratory for Hydraulic Machines, EPFL, Ecole Polytechnique Fédérale Lausanne, Lausanne - Switzerland.

Purpose: We present the test bench results of a valveless total artificial heart that is potentially compatible with the pediatric population.

Methods: The RollingHeart is a valveless volumetric pump generating pulsatile flow. It consists of a single spherical cavity divided into 4 chambers by 2 rotating disks. Read More

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November 2017

Use of BioPatch® (Protective Disk with Chlorhexidine Gluconate) in Closed-Suction Drainage for Penile Implant Surgery.

Curr Urol 2014 Oct 20;7(4):191-4. Epub 2014 Aug 20.

Hahnemann University Hospital, Philadelphia, Pa., USA.

Background: The use of closed-suction drains after penile implant surgery remains controversial. The use of BioPatch®, a protective disk with chlorhexidine gluconate, may reduce the incidence of drain-related infections, one of the feared complications of drains. The aim of this study is to describe a novel use of BioPatch® in penile implant surgery as well as additional techniques that may potentially minimize infection rates. Read More

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October 2014

Association of Streptococcus bovis presence in colonic content with advanced colonic lesion.

World J Gastroenterol 2015 May;21(18):5663-7

Maya Paritsky, Department of Gastroenterology, Baruch Padeh Medical Center, Poria, Lower Galilee 15208, Israel.

Aim: To prospectively examine the association between presence of Streptococcus bovis (S. bovis) in colonic suction fluid and the endoscopic findings on colonoscopy.

Methods: From May 2012 to March 2013, 203 consecutive patients who underwent colonoscopy for any reason were enrolled in the study. Read More

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Lumbar discal cyst: Diagnostic discography followed by therapeutic computed tomography-guided aspiration and injection.

J Radiol Case Rep 2014 Dec 31;8(12):35-40. Epub 2014 Dec 31.

Department of Physiatry, Hospital for Special Surgery, New York, USA.

Discal cysts are extradural masses that communicate with the intervertebral disk and are a rare cause of lower back pain and lumbar radiculopathy. This case report describes a lumbar discal cyst, the diagnosis of which was confirmed on conventional discography, and which was treated with computed tomography-guided aspiration and steroid injection. Several reports have described this procedure, but only one in the radiology literature, and thus the purpose of this report is to remind the radiology community of the existence of this entity and propose a minimally invasive means of treatment. Read More

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December 2014

On the anatomy of the temporomandibular joint and the muscles that act upon it: observations on the gray whale, Eschrichtius robustus.

Anat Rec (Hoboken) 2015 Apr 3;298(4):680-90. Epub 2015 Mar 3.

Department of Paleontology, San Diego Natural History Museum, San Diego, California; Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan.

The temporomandibular joint and its associated musculature are described in a neonate gray whale (Eschrichtius robustus) and serve as the basis for direct anatomical comparisons with the temporomandibular region in other clades of baleen whales (Mysticeti). Members of the right whale/bowhead whale clade (Balaenidae) are known to possess a synovial lower jaw joint, while members of the rorqual clade (Balaenopteridae) have a nonsynovial temporomandibular joint characterized by a highly flexible fibrocartilaginous pad and no joint capsule. In contrast, the gray whale possesses a modified temporomandibular joint (intermediate condition), with a vestigial joint cavity lacking a fibrous capsule, synovial membrane, and articular disk. Read More

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First Report of OXA-4, an ESBL Isolated from Pseudomonas aeruginosa a South Indian Strain.

Indian J Microbiol 2013 Sep 31;53(3):308-14. Epub 2012 Oct 31.

Department of Microbiology, International Centre for Cardio Thoracic and Vascular Diseases, A Unit of Frontier Lifeline, Chennai, 600 101 Tamilnadu India.

The OXA-type β-lactamases are so named because of their oxacillin-hydrolyzing abilities. In this study we characterize an extended spectrum β-lactamase, designated OXA-4, produced by a clinical isolate of Pseudomonas aeruginosa. ESBL production was detected by double disk synergy test. Read More

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September 2013

Role of nitric oxide in optic nerve head blood flow regulation during an experimental increase in intraocular pressure in healthy humans.

Exp Eye Res 2013 Nov 20;116:247-53. Epub 2013 Sep 20.

Department of Clinical Pharmacology, Medical University of Vienna, Austria; Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria.

The present study set out to investigate whether nitric oxide, a potent vasodilator, is involved in the regulatory processes in optic nerve head blood flow during an experimental increase in intraocular pressure (IOP). The study was conducted in a randomized, double-masked, placebo-controlled, three way cross-over design. 12 healthy subjects were scheduled to receive either L-NMMA (an unspecific nitric oxide synthase inhibitor), phenylephrine (an α-adrenoceptor agonist) or placebo on three different study days. Read More

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November 2013

Regulation of optic nerve head blood flow during combined changes in intraocular pressure and arterial blood pressure.

J Cereb Blood Flow Metab 2013 Dec 7;33(12):1850-6. Epub 2013 Aug 7.

1] Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria [2] Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.

In the choroid, there is evidence that blood flow does not only depend on ocular perfusion pressure (OPP), but also on absolute mean arterial pressure (MAP) and intraocular pressure (IOP). The present study included 40 healthy subjects to investigate whether such behavior is also found in the optic nerve head (ONH). The ONH blood flow (ONHBF) was studied using laser Doppler flowmetry during a separate increase in IOP and MAP as well as during a combined elevation. Read More

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December 2013

Comparison of choroidal and optic nerve head blood flow regulation during changes in ocular perfusion pressure.

Invest Ophthalmol Vis Sci 2012 Jul 1;53(8):4337-46. Epub 2012 Jul 1.

Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria.

Purpose: We compared the response of choroidal and optic nerve head blood flow (ChBF, ONHBF) in response to an increase in ocular perfusion pressure (OPP) during isometric exercise and during a decrease in OPP during an artificial increase in intraocular pressure (IOP).

Methods: We included 96 healthy subjects in our study. In 48 subjects OPP was increased by 6 minutes of squatting, and either ONHBF (n = 24) or ChBF (n = 24) was measured continuously. Read More

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Signaling states of rhodopsin in rod disk membranes lacking transducin βγ-complex.

Invest Ophthalmol Vis Sci 2012 Mar 9;53(3):1225-33. Epub 2012 Mar 9.

Department of Ophthalmology, Saint Louis University School of Medicine, Saint Louis, MO, USA.

Purpose: To characterize the possible role of transducin Gtβγ-complex in modulating the signaling properties of photoactivated rhodopsin and its lifetime in rod disc membranes and intact rods.

Methods: Rhodopsin photolysis was studied using UV-visible spectroscopy and rapid scanning spectroscopy in the presence of hydroxylamine in highly purified wild-type and Gtγ-deficient mouse rod disc membranes. Complex formation between photoactivated rhodopsin and transducin was measured by extra-metarhodopsin (meta) II assay. Read More

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Detection of Δ9-tetrahydrocannabinol in exhaled breath collected from cannabis users.

J Anal Toxicol 2011 Oct;35(8):541-4

Department of Medicine, Section of Clinical Pharmacology, Karolinska Institutet, Stockholm, Sweden.

Exhaled breath has recently been proposed as a new possible matrix for drugs of abuse testing. A key drug is cannabis, and the present study was aimed at investigating the possibility of detecting tetrahydrocannabinol and tetrahydrocannabinol carboxylic acid in exhaled breath after cannabis smoking. Exhaled breath was sampled from 10 regular cannabis users and 8 controls by directing the exhaled breath by suction through an Empore C(18) disk. Read More

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October 2011

Preparation of graphene by jet cavitation.

Nanotechnology 2011 Sep 16;22(36):365306. Epub 2011 Aug 16.

Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics, Haidian District, Beijing, People's Republic of China.

Despite its bright prospects, graphene faces challenges including issues concerning mass production. Here we present a totally green approach whereby common crystal graphite can be exfoliated into graphene sheets in aqueous solution by jet cavitation. This is possible mainly because the tensile stress caused by graphite-solution interfacial reflection of compressive waves acts an intensive 'suction disk' on the graphite flakes. Read More

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September 2011

Ocular blood-flow hemodynamics before and after application of a laser in situ keratomileusis ring.

J Cataract Refract Surg 2010 Feb;36(2):268-72

Department of Optometry and Visual Science, City University, Northampton Square, London EC1V OHB, United Kingdom.

Purpose: To evaluate blood-flow responses before and after microkeratome application.

Setting: School of Life and Health Sciences, Aston University, Birmingham, United Kingdom.

Methods: Hemodynamic responses were measured in eyes of healthy volunteers before and after transient elevation in intraocular pressure (IOP) resulting from microkeratome application. Read More

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February 2010

Optic disc diameter increases during acute elevations of intraocular pressure.

Invest Ophthalmol Vis Sci 2010 May 11;51(5):2313-6. Epub 2009 Nov 11.

Capital Eye Specialists, Wellington, New Zealand.

Purpose: To evaluate optic nerve diameter changes in glaucomatous and nonglaucomatous eyes during transient elevation of intraocular pressure (IOP).

Methods: This prospective experimental study included 100 subjects: 38 with glaucoma and 62 without glaucoma. Elevation of IOP to an average of 64 mm Hg for less than 30 seconds was induced in one eye of all subjects by means of a modified LASIK suction ring. Read More

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Corneal hysteresis but not corneal thickness correlates with optic nerve surface compliance in glaucoma patients.

Invest Ophthalmol Vis Sci 2008 Aug 3;49(8):3262-8. Epub 2008 Mar 3.

Capital Eye Specialists, Wellington, New Zealand.

Purpose: To investigate relationships between acute intraocular pressure (IOP)-induced optic nerve head surface deformation and corneal hysteresis and thickness in glaucomatous and nonglaucomatous human eyes.

Methods: This was a prospective experimental study of 100 subjects (38 with glaucoma, 62 without glaucoma). Data collected included spherical equivalent, optic disc diameter, central corneal thickness (CCT), axial length, cylinder, Goldmann IOP, Pascal IOP, and ocular pulse amplitude and ocular response analyzer (ORA) measurements of corneal hysteresis (CH). Read More

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Aerodynamic mass spectrometry interfacing of microdevices without electrospray tips.

Lab Chip 2006 Oct 22;6(10):1306-14. Epub 2006 Aug 22.

Institute of Analytical Chemistry, Veveri 97, 61142 Brno, Czech Republic.

A new concept for electrospray coupling of microfluidic devices with mass spectrometry was developed. The sampling orifice of the time-of-flight mass spectrometer was modified with an external adapter assisting in formation and transport of the electrosprayed plume from the multichannel polycarbonate microdevice. The compact disk sized microdevice was designed with radial channels extending to the circumference of the disk. Read More

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October 2006

Effects of moderate changes in intraocular pressure on ocular hemodynamics in patients with primary open-angle glaucoma and healthy controls.

Ophthalmology 2005 Aug;112(8):1337-42

Department of Clinical Pharmacology, University of Vienna, Vienna, Austria.

Purpose: There is some indirect evidence for altered autoregulation in patients with glaucoma, but only a few studies have measured ocular blood flow directly during changes in ocular perfusion pressure. The present study was designed to compare pulsatile choroidal blood flow and optic nerve head (ONH) blood flow during moderate increases in intraocular pressure (IOP) in patients with primary open-angle glaucoma (POAG) and normal controls.

Design: Two nonrandomized studies comparing blood flow responses in glaucoma patients and controls in an open design. Read More

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Short-term increase of intraocular pressure does not alter the response of retinal and optic nerve head blood flow to flicker stimulation.

Invest Ophthalmol Vis Sci 2005 May;46(5):1721-5

Departments of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria.

Purpose: It has been shown that stimulation with diffuse luminance flicker induces vasodilatation in the human retina and increases optic nerve head (ONH) blood flow. The present study was designed to investigate the influence of a short-term increase in intraocular pressure on flicker-induced changes in ONH blood flow and retinal vessel diameters.

Methods: In a group of 15 healthy volunteers, IOP was increased by the episcleral suction cup technique. Read More

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