Hydrogen peroxide (H2O2) is a versatile oxidizing agent with numerous applications in various industries. One application of H2O2 is for water treatment, where it is combined with an ultraviolet (UV) ...radiation source to produce hydroxyl radicals. For point-of-use water treatment devices, the in-situ electrochemical generation of H2O2 is a more attractive solution compared with the external addition of chemicals. One common electrode for H2O2 production is gas diffusion electrode (GDE), which facilitates oxygen transport to the reaction zone. In our study, a GDE was developed based on an expanded polytetrafluoroethylene (ePTFE) substrate for the in-situ cathodic production of H2O2. The GDE characterization indicated its longevity and tolerance to a pressure difference of more than 70 psi, which is typical in residential water distribution systems. The performance of the GDE was evaluated in an electrochemical cell based on various parameters. The cell generated ∼0.6 mM H2O2 at a catalyst loading of 0.22 mg cm–2, flow rate of 40 mL min–1, and current density of ∼200 A m–2. When coupled with a UV-LED array, the ePTFE-based cell was able to oxidize >60% of methylene blue. To the best of our knowledge, this is the first study in which an ePTFE-based GDE has been applied to the electrochemical generation of H2O2, with the ePTFE network as the gas diffusion layer (GDL), thus making the system practically leak-free. The air-breathing electrochemical cell with the ePTFE-based GDE is a reliable means of generating H2O2.
Nickel hypersensitivity is a rarely reported complication of percutaneous patent foramen ovale/atrial septal defect closure. Herein, we report a case of systemic allergic contact dermatitis to nickel ...present in a GORE CARDIOFORM (W.L. Gore, Flagstaff, Arizona) septal occluder that resolved following explanation. To our knowledge this is the first published case of nickel hypersensitivity associated with this device. (Level of Difficulty: Beginner.)
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To review current literature and experience with Gore-TexⓇ implant extrusion following medialization thyroplasty, as well as to report the unique case of Gore-TexⓇ implant extrusion following ...revision medialization thyroplasty.
Review of existing literature and description of personal experience with unique case of Gore-TexⓇ implant extrusion following revision medialization thyroplasty.
Review of existing literature found no prior reported cases of Gore-TexⓇ implant extrusion following revision medialization thyroplasty. Risk factors for implant extrusion include the pressure of the implant on insertion and the inability to secure the implant. Cases of implant extrusion can be managed operatively via an endoscopic or via an external open approach.
This is the first reported case of Gore-TexⓇ implant extrusion following revision medialization thyroplasty. Careful consideration should be given in revision medialization thyroplasty as additional implant material may cause increased pressure, a risk factor for implant extrusion.
Type 1 thyroplasty treats glottic insufficiency (GI) through vocal fold medialization. The safety of type 1 thyroplasty and its efficacy in an outpatient setting have not been investigated in ...patients with mobile vocal folds.
The purpose of this study was to investigate efficacy and safety of outpatient type 1 thyroplasty using Gore-Tex for mobile vocal folds.
Patients from our voice center who had vocal fold paresis, had not had prior thyroplasty, and who underwent type 1 thyroplasty using Gore-Tex implants and were followed for at least 3 months were included in this retrospective study. Strobovideolaryngoscopy footage from each patient's preoperative and postoperative visits was compiled and de-identified. Three blinded physician raters reviewed and evaluated the videos to determine glottic closure and complications. Interrater reliability was moderate and intrarater reliability was good for GI.
A total of 108 patients with an average age of 49.6 years were included in the retrospective cohort. GI improved significantly in patients from preoperative to first postoperative visit and from preoperative to second postoperative visit. The GI improvement from the second to third visit was not significant. In total, 33 patients underwent additional Thyroplasty, 12 due to revision from a complication and 25 for further voice improvement. There were no major complications seen. Within 1 month of surgery, the most frequent findings were edema and hemorrhage. Long-term complications evaluated by raters were reported inconsistently with poor interrater and intrarater reliability, and therefore were excluded.
Overall, outpatient type 1 thyroplasty using a Gore-Tex implant is safe and effective in treating dysphonia due to GI in patients with vocal fold paresis and mobile vocal folds. There were no major complications within 1 week of surgery requiring hospitalization, supporting the literature that type 1 thyroplasty is safe to perform in the outpatient setting.
Objective The purpose of this study was to identify risks for mesh/suture erosions following abdominal sacral colpopexy (ASC). Study Design We analyzed demographic, perioperative variables, and ...erosion status in 322 participants in the Colpopexy and Urinary Reduction Efforts study 2 years after sacral colpopexy. Results The predominant graft used was synthetic mesh: woven polyester (Mersilene; Ethicon, Inc, Somerville, NJ) (42%) or polypropylene (48%). Twenty subjects (6%) experienced mesh/suture erosion. Unadjusted risk factors for mesh/suture erosion were expanded polytrafluroethylene (ePTFE) mesh (ePTFE 4/21 19% vs non-ePTFE 16/301 5%; odds ratio OR, 4.2), concurrent hysterectomy (OR, 4.9), and current smoking (OR, 5.2). Of those with mesh erosion, most affected women (13/17) underwent at least 1 surgery for partial or total mesh removal. Two were completely resolved, 6 had persistent problems, and 5 were lost to follow-up. No resolution was documented in the 4 women who elected observation. Conclusion Expanded PTFE mesh should not be used for sacral colpopexy. Concurrent hysterectomy and smoking are modifiable risks for mesh/suture erosion.
Purpose To assess the clinical outcomes of symblepharon release in patients with ocular surface chemical injury using Gore-Tex as a novel treatment option. Methods This was a retrospective analysis ...of 23 eyes of 22 chemical injury patients done during a period of January 2014 to December 2021 at a tertiary eye care centre in South India. All patients underwent symblepharon lysis along with Gore-Tex application over the sclera with minimum 1 year follow up. The patients were assessed for demographic details, visual acuity, intraocular pressure, anterior and posterior segment details, photographic documentation, preoperative diagnosis, previous surgical details in recurrent cases, surgical procedures, final visual acuity, surgical outcomes, and complications. The clinical outcomes were assessed and outcomes were defined as success, partial success, or failure. Results The median age was 17 years (IQR, 12–39 years). Among them 10 eyes with symblepharon had grade 3 length, 12 eyes grade 3 width and 12 eyes had grade 3 loss of palisades of Vogt. The success was achieved in 52.2% of the patients; partial success in 34.8% and 13.3% had failure. The mean duration of recurrence was 6.75 ± 3.6 months. Failure was noted in young patients with mean age 9.75years and with grade 3c symblepharon. There was no sight threatening complications noted. Conclusion The study showed very good results with Gore-Tex as a novel treatment option for chemical injury patient with symblepharon formation. It can be easily employed to prevent the symblepharon recurrence of various ocular surface disorders.
Winning Florida Zelnick, Robert
2001, 2001-08-01, Letnik:
500
eBook
With a reporter's keen eye for detail, award-winning journalist Zelnick conveys every emotion of the key players in this battle, presenting a rich, colorful tale that reads more like a fictional ...political thriller than the bizarre real-life drama it wasfrom election night through the U.S. Supreme Court's historic decision.
Resumen: Utilizando los aparatos teóricos de Giorgio Agamben y de Sayak Valencia, en el presente trabajo demuestro que el narcotráfico actúa en la novela Perra Brava de Orfa Alarcón como un ...dispositivo de poder sexo-genérico e induce la reproducción de masculinidades endriagas y que reafirman un sistema necropolítico, heteropatriarcal y violento. Esto explica que la heroína, Fernanda Salas, al transformarse en un sujeto endriago y alcanzar la cima de la organización criminal no se libere ni subvierta el sistema que la oprime sino que lo retroalimente, con lo cual asistimos a su resurrección o renacimiento fallido.
This paper demonstrates that some non-classical models of human decision-making can be run successfully as circuits on quantum computers. Since the 1960s, many observed cognitive behaviors have been ...shown to violate rules based on classical probability and set theory. For example, the order in which questions are posed in a survey affects whether participants answer 'yes' or 'no', so the population that answers 'yes' to both questions cannot be modeled as the intersection of two fixed sets. It can, however, be modeled as a sequence of projections carried out in different orders. This and other examples have been described successfully using quantum probability, which relies on comparing angles between subspaces rather than volumes between subsets. Now in the early 2020s, quantum computers have reached the point where some of these quantum cognitive models can be implemented and investigated on quantum hardware, by representing the mental states in qubit registers, and the cognitive operations and decisions using different gates and measurements. This paper develops such quantum circuit representations for quantum cognitive models, focusing particularly on modeling order effects and decision-making under uncertainty. The claim is not that the human brain uses qubits and quantum circuits explicitly (just like the use of Boolean set theory does not require the brain to be using classical bits), but that the mathematics shared between quantum cognition and quantum computing motivates the exploration of quantum computers for cognition modeling. Key quantum properties include superposition, entanglement, and collapse, as these mathematical elements provide a common language between cognitive models, quantum hardware, and circuit implementations.
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