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Pang Cheng - - 2013
We present a micro-electro-mechanical systems (MEMS) based Fabry-Perot (FP) sensor along with an optical system-on-a-chip (SOC) interrogator for simultaneous pressure and temperature sensing. The sensor employs a simple structure with an air-backed silicon membrane cross-axially bonded to a 45° polished optical fiber. This structure renders two cascaded FP cavities, enabling ...
Lupton Samantha J SJ University of Western Sydney, School of Medicine, Locked Bag 1797, Penrith, NSW 2751, Australia. - - 2013
Preeclampsia is a leading cause of maternal morbidity and mortality. The degree of maternal cardiovascular dysfunction that precedes the onset of preeclampsia is largely unknown. This prospective cohort study aimed to characterize differences in vivo in retinal microvascular caliber and blood pressure throughout pregnancy in relation to preeclampsia development. Women ...
McMonnies Charles W - - 2013
An examination of how intraocular pressure distending forces on the posterior sclera are an important mechanism in the development and progression of axial myopia has been made. Papers were selected from the results of PubMed (143) and Science Direct (1,398) searches using the key word combinations of 'axial myopia' and ...
Hatami-Marbini Hamed - - 2013
Abstract Purpose: The aim of this study was to characterize swelling pressure-thickness, swelling pressure-hydration and hydration-thickness relations of porcine cornea. Methods: Mechanical compression tests and free swelling experiments were performed on porcine cornea. A rheometer (DHR-2, TA Instruments) with a thermally controlled fluid chamber filled with 0.9% NaCl solution was ...
van der Houwen E B - - 2013
The use of soft elastic biomaterials in medical devices enables substantial function integration. The consequent increased simplification in design can improve reliability at a lower cost in comparison to traditional (hard) biomaterials. Functional bi-stable buckling is one of the many new mechanisms made possible by soft materials. The buckling behavior ...
Katsuno Chikara - - 2013
Polymer membranes comprising slide-ring gels with movable cross-links exhibit a nonlinear pressure-dependence in the fluidic flow rate. The proportional constant between the flow rate and pressure significantly changes at a critical pressure. The slide-ring gels are promising polymer membrane materials, which would allow for the on-off control of fluid permeability ...
Mesman R J - - 2013
With the development of Cryo Electron Microscopy Of Vitreous Sections (CEMOVIS), imaging cells in a close to native state has become a reality. However with the commonly used carriers for high-pressure freezing and cryo-sectioning, adherent grown cells either need to be detached from their substrate. Here a new method is ...
Gómez-Martínez Rodrigo - - 2013
The ability to measure pressure changes inside different components of a living cell is important, because it offers an alternative way to study fundamental processes that involve cell deformation. Most current techniques such as pipette aspiration, optical interferometry or external pressure probes use either indirect measurement methods or approaches that ...
Auth Thorsten - - 2013
The fluctuation pressure of a lipid-bilayer membrane is important for the stability of lamellar phases and the adhesion of membranes to surfaces. In contrast to many theoretical studies, which predict a decrease of the pressure with the cubed inverse distance between the membranes, Freund suggested very recently a linear inverse ...
Rose William C - - 2013
A mathematical model of whole body and cerebral hemodynamics is a useful tool for investigating visual impairment and intracranial pressure (VIIP), a recently described condition associated with space flight. VIIP involves loss of visual acuity, anatomical changes to the eye, and, usually, elevated cerebrospinal fluid pressure. Loss of visual acuity ...
Wachtel Lee Elizabeth - - 2013
We present a 12-year-old autistic boy who underwent electroconvulsive therapy (ECT) for intractable self-injury toward his head and eyes in the context of acute bilateral retinal detachment and reparative surgery. The patient received 3 ECTs before retinal reattachment surgery, and resumed ECT 2 weeks postoperatively. Bilateral intraocular pressures were monitored ...
Sng Chelvin C A - - 2013
To examine the effect of blood pressure (BP) on retinal vascular fractal dimension (Df), a measure of microvascular network complexity and density in a multiethnic cohort. A population-based study of 3876 Chinese, Malay and Indian participants in Singapore. Retinal Df was measured using a computer-based program from digital retinal photographs. ...
Willmann Gabriel - - 2013
PURPOSE: This study aimed to quantify the impact of exposure to high altitude on individual layers of the cornea in regard to central corneal thickness and the geometry of the anterior chamber angle. This work is related to the Tübingen High Altitude Ophthalmology (THAO) study. METHODS: Anterior segment spectral domain ...
Shiga Yukihiro - - 2013
Abstract Purpose: To investigate, using laser speckle flowgraphy (LSFG), the autoregulation of ocular blood flow (BF) in response to posture change. Methods: This study comprised 20 healthy volunteers (mean age 30.0 ± 8.5). The mean blur rate (MBR) of the ocular circulation in the subjects was assessed in both a sitting and ...
Rostocki A J - - 2013
This paper presents measurements of sound velocity and attenuation in olive oil, with known chemical composition, as a function of pressure, within the range of pressure up to 0.7 GPa. Dependencies of sound velocity, relative ultrasonic wave attenuation, volume, and adiabatic compressibility on pressure show discontinuities. This proves the existence of ...
Abe Fumiyoshi - - 2013
High hydrostatic pressure has a profound physiological impact on lipid membranes, primarily resulting in tighter packing and restriction of acyl-chain motion. To fulfill membrane protein functions in high-pressure environments, deep-sea organisms possess specialized cell membranes. Although the effects of high-pressure on model membranes have been investigated in great detail, high-pressure-induced ...
Stodtmeister Richard - - 2013
PURPOSE: The pressure in the central retinal vein (CRVP) has been shown to be higher in glaucoma patients than in controls. Until now, these measurements have been performed in arbitrary units or in units of ophthalmodynamometric force. In this study, a contact lens dynamometer calibrated in mmHg was used to ...
Torres Felipe Soares - - 2013
OBJECTIVE: Abnormalities in retinal vessels are frequent, but its association with findings in other vascular sites has been scarcely investigated. This study aimed to examine the association between ultrasound-measured carotid intima-media thickness (IMT) and retinal arteriolar and venular diameters, in hypertensive patients. METHODS: In this cross-section study, 173 hypertensive patients ...
Levasseur Steve D - - 2013
PURPOSE:: To evaluate the effects and safety of travel by land through high mountainous elevations after surgery in patients who have undergone pars plana vitrectomy with intraocular gas. METHODS:: A retrospective cohort study of 75 patients post pars plana vitrectomy with intraocular gas who traveled by land through mountain elevations ...
Mochizuki Dai - - 2013
The accurate and high-resolution measurement of surface pressure is achieved by a pressure/ temperature-sensitive composite paint (bi-PSP), whereas the pressure-sensitive dye photodegraded the temperature sensitive dye in close arrangement of both dyes. In the present study, an attempt was made to synthesize a homogeneous bi-PSP membrane without light-induced degradation of ...
Feke Gilbert T - - 2013
Abstract Purpose: To assess whether dorzolamide 2%-timolol 0.5% (D/T) and/or brimonidine 0.2%-timolol 0.5% (B/T) alters retinal vascular autoregulation (RVA) and seated ocular perfusion pressure (sOPP) in primary open angle glaucoma (POAG) patients who demonstrate retinal vascular dysregulation (RVD) on timolol 0.5% alone. Methods: In this prospective, observer-masked, crossover study, 21 ...
Faria-Correia Fernando - - 2013
PURPOSE:To report the tomographic and biomechanical findings before and after treatment of a case of pressure-induced stromal keratopathy (PISK), which was misdiagnosed as diffuse lamellar keratitis (DLK). METHODS:A case report of a referred patient with supposed diagnosis of DLK after LASIK in the right eye. Scheimpflug-based corneal tomography and biomechanical ...
Cougnard-Grégoire Audrey - - 2013
To explore the association of AMD with long-term average blood pressure (BP) parameters, including pulse pressure (PP). The ALIENOR study is a population-based study on age-related eye diseases in 963 residents of Bordeaux, France, aged 73 years or older. AMD was graded from nonmydriatic color retinal photographs, in three exclusive ...
Xu Liang - - 2013
BACKGROUNDWe examined the relationship between arterial hypertension, localized retinal nerve fiber layer defects (RNFLDs), and retinal vascular abnormalities.METHODSThe study included 359 patients with arterial hypertension and 331 individuals without hypertension as control subjects. Localized RNFLDs and retinal vascular abnormalities were assessed on fundus photographs.RESULTSAfter adjusting for blood concentrations of glycosylated ...
Krilis Matthew - - 2013
Amyl nitrite 'poppers' are recreational drugs, which are a potent source of nitric oxide. The use of 'poppers' can cause psychoactive stimulation, reduced blood pressure, tachycardia and involuntary muscle relaxation. Their use is becoming increasingly common around the world, including approximately 60% of Australia's male homosexual community. We report the ...
Lamelas Frank J - - 2013
An asymmetric moissanite anvil cell is used to study aqueous solutions of ammonium iodide at pressures up to 10 kbar. The index of refraction is measured using the rotating Fabry-Perot technique, with an accuracy of approximately 1%. The mass density and molar volume of the solutions are estimated using the ...
Wu Stanley - - 2013
We explored the technological concept of the nanoparticle structuring in the wedge film with regards to its application to the oily soil removal phenomena. The experimental and theoretical investigations on the cleansing of canola oil from a glass substrate using commercially available nanofluids were pursued. Five commercially-available nanofluids with pHs ...
Rabbani Mohammad Gulam - - 2013
Hole-some mixture: A 2D mesoporous covalent organic framework featuring expanded pyrene cores and linked by imine linkages has high surface area (SA(BET) =2723 m(2)  g(-1) ) and exhibits significant gas storage capacities under high pressure, which make this class of material very promising for gas storage applications.
Thurtell Matthew J MJ Department of Ophthalmology & Visual Sciences, University of Iowa, 200 Hawkins Dr PFP, Iowa City, IA, 52242, USA, - - 2013
Idiopathic intracranial hypertension (IIH, pseudotumor cerebri) is a syndrome of elevated intracranial pressure of unknown cause that occurs predominantly in obese women of childbearing age. It is a diagnosis of exclusion and, therefore, other causes of increased intracranial pressure must be sought with history, imaging, and cerebrospinal fluid examination before ...
Taibbi Giovanni G Department of Ophthalmology and Visual Sciences, The University of Texas Medical Branch, Galveston, TX 77555-1106, - - 2013
We report ocular changes occurring in a healthy human subject enrolled in a bed rest (BR) study designed to replicate the effects of a low-gravity environment. A 25-yr-old Caucasian man spent 30 consecutive days in a 6 degrees head-down tilt (HDT) position at the NASA Flight Analogs Research Unit. Comprehensive ...
Murdock Adrian T - - 2013
We report that the shape, orientation, edge geometry and thickness of chemical vapour deposition graphene domains can be controlled by the crystallographic orientations of Cu substrates. Under low-pressure conditions single layer graphene domains align with zig-zag edges parallel to a single <101> direction on Cu(111) and Cu(101), while bilayer domains ...
Murgan Ilina - - 2013
INTRODUCTION Increasing evidence suggests that arterial hypertension (AHT) may begin in childhood and result in the premature development of cardiovascular disease. In view of this, we believed it would be important to investigate the early vascular changes related to early hypertension at the micro- and macrovascular levels both under normal ...
Kong Chang Yi - - 2013
The diffusion coefficients D(12) of phenylbutazone at infinite dilution in supercritical CO(2) were measured by the chromatographic impulse response (CIR) method. The measurements were carried out over the temperature range from 308.2 to 343.2K at pressures up to 40.0MPa. In addition, the D(12) data of phenylbutazone at infinite dilution in ...
Triantafyllou Areti - - 2013
BACKGROUND Hypertensive patients with retinal arteriolar abnormalities are at increased risk for cardiovascular events. However, the extent of retinal microvascular changes in naïve, never-treated patients with hypertension of short duration has not been established. In addition to this, the lack of relevant data about other phenotypes of hypertension (masked and ...
Kotliar Konstantin - - 2013
OBJECTIVE: Hypertension is characterized by microvascular remodeling resulting in increased wall/lumen ratio and elevated microvascular stiffness. Aiming to transform the measurement of macrovascular stiffness into a microvascular environment we introduce a non-invasive method to assess retinal pulse wave velocity (rPWV). rPWV alterations in early hypertension are investigated in detail. The ...
Langendorf S - - 2013
A novel method for the characterization and qualification of Hall effect thruster propellant distributors is presented. A quantitative measurement of the azimuthal number density uniformity, a metric which impacts propellant utilization, is obtained from photographs of a premixed flame anchored on the exit plane of the propellant distributor. The technique ...
Barak Yoreh - - 2013
The purpose of this study was to compare postoperative intraocular pressures and percentage of vitreous cavity gas fill one day following 25-gauge pars plana vitrectomy with 20% versus 25% sulfur hexafluoride (SF6) gas fill. This was a retrospective review of 187 consecutive cases of 25-gauge pars plana vitrectomy with complete ...
Reimann Manja - - 2013
To assess acute effects of bevacizumab (anti-VEGF therapy) on cerebral microvessels and systemic cardiovascular regulation. 20 consecutive patients with colorectal cancer (median age: 60.4 years, range 45.5-73.9 years) received bevacizumab intravenously (5 mg/kg) uncoupled of chemotherapy. Prior to and within the first 24 hours after bevacizumab infusion, patients were investigated for retinal endothelial function. ...
Moreira Grazielle Furtado - - 2013
The objective of this study was to evaluate different strategies for the application of entomopathogenic nematodes (EPN). Three different models of spray nozzles with air induction (AI 11003, TTI 11003 and AD-IA 11004), three spray pressures (207, 413 and 720 kPa), four different additives for tank mixtures (cane molasses, mineral ...
Huang Wenbin - - 2013
To evaluate the peripapillary choroidal thickness of a healthy Chinese population, and to determine its influencing factors. A total of 76 healthy volunteers (76 eyes) without ophthalmic or systemic symptoms were enrolled. Choroidal scans (360-degree 3.4 mm diameter peripapillary circle scans) were obtained for all eyes using enhanced depth imaging ...
Kim Moosang - - 2013
Herein, we report a case of abrupt suprachoroidal hemorrhage (SCH) that developed during peritoneal dialysis in a patient with proliferative diabetic retinopathy. A 53-year-old female patient visited our clinic with blurred vision due to vitreous hemorrhage and proliferative diabetic retinopathy. Her medical history included diabetes, hypertension, chronic renal failure, and ...
Quaid Patrick - - 2013
To determine through retrospective file analysis which clinical factors best predict glaucomatous optic neuropathy as evaluated by Heidelberg retinal tomography (HRT II) imaging. One HUNDRED twenty-two records from patients referred for HRT imaging at the University of Waterloo Ocular Heath Clinic met inclusion criteria for this study and were reviewed. ...
Bui Bang V - - 2013
To determine relationship between the magnitude of intraocular pressure (IOP) during a fixed-duration episode of acute elevation and the loss of retinal function and structure 4 weeks later in rats. Unilateral elevation of IOP (105 minutes) was achieved manometrically in adult Brown Norway rats (9 groups; n = 4 to 8 each, ...
Nicholson Luke - - 2013
We report a case of a male patient having bilateral cystoid macular oedema and cotton wool spots associated with Henoch-Schonlein purpura. He presented with decreased vision bilaterally measuring 0.2 (6/9.5) on the right and 0.5 (6/19) on the left. He has chronic hypertension with blood pressure averaging 150/90. His blood ...
Yau P L - - 2013
We examined 33 hypertensive (22 with comorbid type 2 diabetes mellitus (T2DM)) and 29 normotensive (8 with T2DM) middle-aged and elderly adults, comparable in age and education. Relative to normotensive participants, those with hypertension, in addition to a higher prevalence of periventricular white matter (WM) lesions, had significantly lower WM ...
Sródka Wiesław - - 2013
So far applanation tonometry has not worked out any theoretical basis for correcting the result of intraocular pressure measurement carried out on a cornea with noncalibration dimensions by means of the Goldmann tonometer. All the tables of instrument reading corrections for cornea thickness or cornea curvature radius are based exclusively ...
Jung F F Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, - - 2013
Regardless of the mechanisms that initiate the increase in blood pressure, functional and structural changes in the systemic vasculature are the final result of long-standing hypertension. These changes can occur in the macro- but also in the microvasculature. The supply of the tissues with oxygen, nutrients, and metabolites occurs almost ...
Arciero Julia J Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA. - - 2013
To study whether impaired retinal autoregulation is a risk factor for glaucoma, the relationship between vascular regulatory mechanisms and glaucoma progression needs to be investigated. In this study, a vascular wall mechanics model is used to predict the relative importance of regulatory mechanisms in achieving retinal autoregulation. Resistance vessels are ...
Hamed-Azzam Shirin - - 2012
Intraocular pressure is affected by corneal thickness and biomechanics. Following ablative corneal refractive surgery, corneal structural changes occur. The purpose of the study is to determine the relationship between the mean central corneal thickness (CCT) and the change in intraocular pressure measurements following various corneal ablation techniques, using different measurement ...
Berger Danielle - - 2012
ZnO thin films were prepared by the polymeric precursor method. The films were deposited on silicon substrates using the spin-coating technique, and were annealed at 330 °C for 32 h under pressure-assisted thermal annealing and under ambient pressure. Their structural and optical properties were characterized, and the phases formed were identified by ...
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