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https://www.readbyqxmd.com/read/28439977/method-of-locating-the-visual-axis-objectively
#1
Vasyl Molebny
PURPOSE: To locate the visual axis of the eye objectively. METHOD: Based on three-beam scanning laser radar microprofilometry, a technique is proposed to objectively locate the visual axis of the eye. The laser beam consists of three components, two of them being shifted relatively to the central one by differing frequencies, filtered in spatially orthogonal directions. The centre of the foveola is defined as the crossing of steepest inclinations determined in the specific beam positions on the trajectory of scanning...
May 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28422822/intraoperative-centration-during-small-incision-lenticule-extraction-smile
#2
John X Wong, Elizabeth P Wong, Hla M Htoon, Jodhbir S Mehta
To evaluate intraoperative decentration from pupil center and kappa intercept during small incision lenticule extraction (SMILE) and its impact on visual outcomes.This was a retrospective noncomparative case series. A total of 164 eyes that underwent SMILE at the Singapore National Eye Center were included. Screen captures of intraoperative videos were analyzed. Preoperative and 3 month postoperative vision and refractive data were analyzed against decentration.The mean preoperative spherical equivalent (SE) was -5...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28413409/self-optical-coherence-tomography-and-angiography
#3
Ahmad M Mansour
PURPOSE: To present a new concept of self-optical coherence tomography (OCT) and self-OCT angiography. METHODS: The operator sits in the patient seat and manipulates the instrument body via the joystick with the dominant hand, while the dominant index is ready to press the capture button and while focusing on the fixation target. One senior ophthalmologist judged various OCT machines for ease of self-scan during a major ophthalmic convention. Separately, self-scans were also captured using a single OCT machine by one senior ophthalmologist and 5 junior optometrists and the scans were analyzed for both centration and image quality value (IQV), and compared to regular scans done by an operator...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28410709/suture-guided-sulcus-implantation-of-a-single-piece-foldable-acrylic-intraocular-lens-after-posterior-capsule-rupture
#4
Harinder Singh Sethi, Mayuresh P Naik
We describe a technique for suture-guided sulcus implantation of a foldable acrylic posterior chamber IOL (PC IOL). A 10-0 monofilament nylon suture is used to control insertion of the PC IOL over the ciliary sulcus and enable safe retrieval if the PC IOL drops during insertion, stabilization, or centration. In this technique, the 10-0 monofilament nylon suture acts as a guy rope to hold onto the PC IOL, enabling the surgeon to inject the IOL into the sulcus, unfold it in the iris plane, dial it in the appropriate meridian, and stabilize it...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28396804/impact-of-treatment-decentration-on-higher-order-aberrations-after-smile
#5
Ying Yu, Wenwen Zhang, Xinliang Cheng, Jianru Cai, Hui Chen
Purpose. To evaluate decentration following femtosecond laser small incision lenticule extraction (SMILE) and sub-Bowman keratomileusis (SBK) and its impact on higher-order aberrations (HOAs). Methods. Prospective, nonrandom, and comparison study. There were 96 eyes of 52 patients who received SMILE and 96 eyes of 49 patients who received SBK in this study. Decentration was calculated 6 months after surgery with Pentacam. HOAs and visual acuity after the surgery were examined for patients in both groups before and 6 months after surgery...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28366369/intraindividual-comparison-between-femtosecond-laser-assisted-and-conventional-cataract-surgery
#6
Anna S Mursch-Edlmayr, Matthias Bolz, Nikolaus Luft, Michael Ring, Thomas Kreutzer, Christoph Ortner, Matthias Rohleder, Siegfried G Priglinger
PURPOSE: To compare the safety and efficacy between femtosecond laser-assisted cataract surgery using the Victus laser system and conventional cataract surgery. SETTING: Department of Ophthalmology, Kepler University Hospital, Linz, Austria. DESIGN: Prospective randomized case series. METHODS: Both eyes of patients with age-related cataract were randomized to conventional cataract surgery or femtosecond laser-assisted cataract surgery, both with intraocular lens (IOL) implantation...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28364634/isolation-of-a-bacterial-strain-acinetobacter-sp-from-centrate-wastewater-and-study-of-its-cooperation-with-algae-in-nutrients-removal
#7
Hui Liu, Qian Lu, Qin Wang, Wen Liu, Qian Wei, Hongyan Ren, Caibing Ming, Min Min, Paul Chen, Roger Ruan
Algae were able to grow healthy on bacteria-containing centrate wastewater in a pilot-scale bioreactor. The batch experiment indicated that the co-cultivation of algae and wastewater-borne bacteria improved the removal efficiencies of chemical oxygen demand and total phosphorus in centrate wastewater to 93.01% and 98.78%, respectively. A strain of beneficial aerobic bacteria, Acinetobacter sp., was isolated and its biochemical characteristics were explored. Synergistic cooperation was observed in the growth of algae and Acinetobacter sp...
March 22, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28352045/repellent-effect-of-microencapsulated-essential-oil-in-lotion-formulation-against-mosquito-bites
#8
Norashiqin Misni, Zurainee Mohamed Nor, Rohani Ahmad
BACKGROUND & OBJECTIVES: Many essential oils have been reported as natural sources of insect repellents; however, due to high volatility, they present low repellent effect. Formulation technique by using microencapsulation enables to control the volatility of essential oil and thereby extends the duration of repellency. In this study, the effectiveness of microencapsulated essential oils of Alpinia galanga, Citrus grandis and C. aurantifolia in the lotion formulations were evaluated against mosquito bites...
January 2017: Journal of Vector Borne Diseases
https://www.readbyqxmd.com/read/28345566/intraoperative-optical-coherence-tomography-in-anterior-segment-surgeries
#9
Jeewan S Titiyal, Manpreet Kaur, Ruchita Falera
Intraoperative optical coherence tomography (iOCT) is a noninvasive imaging modality that provides a real-time dynamic feedback of the various surgical steps. Comprehensive literature search was performed in MEDLINE using "intraoperative optical coherence tomography" and "iOCT" as keywords. The use of iOCT as an aid to decision-making has been successfully reported in cases undergoing keratoplasty, implantable Collamer lens (ICL) implantation as well as cataract surgery. iOCT helps to assess the graft-host relationship in penetrating keratoplasty...
February 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28331546/increasing-phosphorus-recovery-from-dewatering-centrate-in-microbial-electrolysis-cells
#10
Pengyi Yuan, Younggy Kim
BACKGROUND: Microbial electrolysis cells (MECs) use bioelectrochemical reactions to remove organic contaminants at the bioanode and produce hydrogen gas at the cathode. High local pH conditions near the cathode can also be utilized to produce struvite from nutrient-rich wastewater. This beneficial aspect was investigated using lab-scale MECs fed with dewatering centrate collected at a local wastewater treatment plant. The main objective was to improve phosphorus recovery by examining various cathode configurations and electric current conditions...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28264128/small-incision-lenticule-extraction-smile-for-hyperopia-optical-zone-centration
#11
Dan Z Reinstein, Kishore R Pradhan, Glenn I Carp, Timothy J Archer, Marine Gobbe, Walter Sekundo, Raynan Khan, Kim Citron, Purushottam Dhungana
PURPOSE: To evaluate optical zone centration of hyperopic small incision lenticule extraction (SMILE). METHODS: This prospective study of 60 consecutive hyperopic SMILE procedures used the VisuMax femtosecond laser and matched LASIK procedures with the VisuMax and MEL 80 excimer lasers (Carl Zeiss Meditec AG, Jena, Germany). Inclusion criteria were maximum attempted hyperopic meridian of between +1.00 and +7.00 diopters (D) and astigmatism up to 6.00 D. For SMILE, the optical zone was between 6...
March 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28222383/simultaneous-biogas-upgrading-and-centrate-treatment-in-an-outdoors-pilot-scale-high-rate-algal-pond
#12
Esther Posadas, David Marín, Saúl Blanco, Raquel Lebrero, Raúl Muñoz
The bioconversion of biogas to biomethane coupled to centrate treatment was evaluated in an outdoors pilot scale high rate algal pond interconnected to an external CO2-H2S absorption column (AC) via settled broth recirculation. CO2-removal efficiencies ranged from 50 to 95% depending on the alkalinity of the cultivation broth and environmental conditions, while a complete H2S removal was achieved regardless of the operational conditions. A maximum CH4 concentration of 94% with a limited O2 and N2 stripping was recorded in the upgraded biogas at recycling liquid/biogas ratios in the AC of 1 and 2...
February 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28221783/cultivation-of-the-marine-macroalgae-chaetomorpha-linum-in-municipal-wastewater-for-nutrient-recovery-and-biomass-production
#13
Shijian Ge, Pascale Champagne
Compared to microalgae, macroalgae are larger in size, thereby imposing lower separation and drying costs. This study demonstrates the feasibility of cultivating macroalgae Chaetomorpha linum in different types of municipal wastewaters, their ability to remove nutrient and their biomass composition for downstream biofuel production. Screening experiments indicated that C. linum grew well on primary (PW) and secondary wastewaters (SW), as well as centrate wastewater (CW) diluted to less than 20%. In a subsequent experiment, a step feeding approach was found to significantly increase biomass productivity to 10...
March 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28215340/quantitative-approaches-for-the-study-of-microtubule-aster-motion-in-large-eggs
#14
H Tanimoto, N Minc
The proper positioning of microtubule (MT) asters underlies fundamental processes such as nuclear centration, cell polarity, division positioning, and embryogenesis. In large eggs and early blastomeres, MT asters may exhibit long range motions with atypical speed and precision to target their functional position. The biophysical mechanisms regulating such motions remain however largely unknown. The centration of sperm asters in sea urchin embryos is a stereotypical example of such aster long range motion. In this chapter, we describe methods developed in this system to (1) quantify sperm aster 3-D motion with confocal microscopy and automated image analysis and (2) severe a portion of astral MTs with a UV laser...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28211878/pre-descemets-endothelial-keratoplasty-the-pdek-clamp-for-successful-pdek
#15
H S Dua, D G Said
PurposeTo design and produce a clamp that enables good handling of donor sclera-corneal disks, allows air to be injected in the corneal stroma and consistently provides pre-Descemets endothelial keratoplasty (PDEK) tissue by creation of a type-1 big bubble (BB) avoiding a type-2BB by shutting the fenestrations in the periphery of the pre-Descemets layer and preventing escape of air.Patients and methodsA clamp with spring loaded handles attached to two rings of 9 mm diameter and 1 mm width with a side port for insertion of a needle for air injection was designed and produced...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28192584/laser-assisted-capsulotomy-centration-a-prospective-trial-comparing-pupil-versus-oct-based-scanned-capsule-centration
#16
Tim Schultz, Nikolaos Tsiampalis, H Burkhard Dick
PURPOSE: To investigate different capsulotomy centration methods for femtosecond laser-assisted cataract surgery. The overlap between intraocular lens (IOL) optic and lens capsule was measured with different centration methods and IOL types. METHODS: This was a prospective randomized clinical trial. Patients with cataract scheduled for femtosecond laser-assisted cataract surgery were assigned to one of four treatment groups: optical coherence tomography (OCT)-based scanned capsule centration (SCC) and three-piece IOL (SCC with three-piece IOL); scanned capsule centration and plate-haptic IOL (SCC with plate-haptic IOL); pupil centration (PC) and three-piece IOL (PC with three-piece IOL); or PC and plate-haptic IOL (PC with plate-haptic IOL)...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28192355/enhancement-of-struvite-pellets-crystallization-in-a-full-scale-plant-using-an-industrial-grade-magnesium-product
#17
D Crutchik, N Morales, J R Vázquez-Padín, J M Garrido
A full-scale struvite crystallization system was operated for the treatment of the centrate obtained from the sludge anaerobic digester in a municipal wastewater treatment plant. Additionally, the feasibility of an industrial grade Mg(OH)2 as a cheap magnesium and alkali source was also investigated. The struvite crystallization plant was operated for two different periods: period I, in which an influent with low phosphate concentration (34.0 mg P·L(-1)) was fed to the crystallization plant; and period II, in which an influent with higher phosphate concentration (68...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28160780/pilot-scale-evaluation-of-ph-based-control-of-single-stage-deammonification-processes-for-sidestream-treatment
#18
David M Graham, Domènec Jolis
  Pilot scale sidestream reactors, utilizing a pH-based control strategy, were operated at the San Francisco Public Utilities Commission (SFPUC), Southeast Plant (SEP) for the biological treatment of anaerobically digested sludge centrate using combined partial nitritation/anaerobic ammonium oxidation (anammox) as the main nitrogen removal pathway. Reactors were setup to functionally simulate two full-scale commercial processes common to the industry using nonproprietary, flexible, pH-based process control strategy...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28128945/biomimetic-chirality-sensing-with-pyridoxal-5-phosphate
#19
Samantha L Pilicer, Pegah R Bakhshi, Keith W Bentley, Christian Wolf
Pyridoxal-5'-phosphate (PLP) is introduced to a biomimetic indicator displacement assay for simultaneous determination of the absolute configuration, enantiomeric composition and concentration of unprotected amino acids, amino alcohols and amines. The chiroptical assay is based on fast imine metathesis with a PLP aryl imine probe to capture the target compound for circular dichroism and fluorescence sensing analysis. The substrate binding yields characteristic Cotton effects that provide information about the target compound ee and the synchronous release of the indicator results in a nonenantioselective off-on fluorescence response that is independent of the enantiomeric sample composition and readily correlated to the total analyte concentration...
January 30, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28126613/centrifuge-separation-effect-on-bacterial-indicator-reduction-in-dairy-manure
#20
Zong Liu, Zachary S Carroll, Sharon C Long, Aicardo Roa-Espinosa, Troy Runge
Centrifugation is a commonly applied separation method for manure processing on large farms to separate solids and nutrients. Pathogen reduction is also an important consideration for managing manure. Appropriate treatment reduces risks from pathogen exposure when manure is used as soil amendments or the processed liquid stream is recycled to flush the barn. This study investigated the effects of centrifugation and polymer addition on bacterial indicator removal from the liquid fraction of manure slurries. Farm samples were taken from a manure centrifuge processing system...
January 23, 2017: Journal of Environmental Management
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