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https://www.readbyqxmd.com/read/29038426/identification-of-catalytic-sites-in-cobalt-nitrogen-carbon-materials-for-the-oxygen-reduction-reaction
#1
Andrea Zitolo, Nastaran Ranjbar-Sahraie, Tzonka Mineva, Jingkun Li, Qingying Jia, Serban Stamatin, George F Harrington, Stephen Mathew Lyth, Petr Krtil, Sanjeev Mukerjee, Emiliano Fonda, Frédéric Jaouen
Single-atom catalysts with full utilization of metal centers can bridge the gap between molecular and solid-state catalysis. Metal-nitrogen-carbon materials prepared via pyrolysis are promising single-atom catalysts but often also comprise metallic particles. Here, we pyrolytically synthesize a Co-N-C material only comprising atomically dispersed cobalt ions and identify with X-ray absorption spectroscopy, magnetic susceptibility measurements and density functional theory the structure and electronic state of three porphyrinic moieties, CoN4C12, CoN3C10,porp and CoN2C5...
October 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29017231/-long-term-follow-up-and-patient-satisfaction-after-tympanoplasty-with-titanium-clip-prothesis
#2
Guido Wolferts, Daniel Schicke, K-Wolfgang Delank
Aim of the present study is to evaluate the long term results of ossiculoplasty using titanium clip prosthesis. A retrospective analysis with prospective follow-up has been done including for all patients who had a Clip-PORP implanted between the years 2002-2013. Following this, audiometric hearing results were measured with clinical examination including otoscopy and quality of life evaluation using Glasgow benefit inventory. 48 patients (51 ears, 29 men, 19 women, average age 44.1 years) received followed up after an average duration of 6...
October 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28944619/comparative-study-of-new-autologous-material-bone-cartilage-composite-graft-for-ossiculoplasty-with-polycel-%C3%A2-and-titanium
#3
J S Kong, C Y Jeong, M J Shim, W J Kim, S W Yeo, S N Park
OBJECTIVE: Ossiculoplasty is a surgical procedure that recreates sound transmission of the middle ear in conductive hearing loss. Various materials have been used for ossicular reconstruction, but the most ideal material for ossiculoplasty remains controversial. The purpose of this study was to introduce a novel method of autologous ossiculoplasty, bone-cartilage composite graft (BCCG) and to compare its surgical results with different types of ossiculoplastic prostheses. STUDY DESIGN: A retrospective study was performed in a tertiary referral centre...
September 25, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28806340/the-impact-of-comorbidities-in-the-aging-population-on-cochlear-implant-outcomes
#4
Brent Jerome Wilkerson, Sandra F Porps, Seilesh C Babu
OBJECTIVES: Cochlear implants have been used for many years for bilateral profound hearing loss. General longevity has continued to increase and, therefore, the age at which cochlear implants are placed has concomitantly increased. Our purpose is to determine whether outcomes and complications are significantly different in the elderly. STUDY DESIGN: Retrospective, clinical review. SETTING: Tertiary referral center, primarily ambulatory setting...
September 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28806310/the-prevention-of-recurrent-cholesteatoma-in-cwu-surgery-the-use-of-titanium-sheeting
#5
Bruce Black, Ian Gutteridge
OBJECTIVE: Assessment of the outcomes of a technique of prevention of recurrent cholesteatoma in canal wall up (CWU) mastoidectomy, using titanium sheeting to repair the external auditory canal wall. PATIENTS: Sixty four cholesteatoma cases were managed during a period from 2007 to 2015. The cases were unselected; the surgery was performed by the senior author. Cholesteatoma Patterns Were: Forty two attic, nine pars tensa, seven combined attic-pars tensa, three congenital, and three other...
October 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28796085/audiometric-outcomes-following-endoscopic-ossicular-chain-reconstruction
#6
Robert J Yawn, Jacob B Hunter, Brendan P O'Connell, George B Wanna, Daniel E Killeen, Cameron C Wick, Brandon Isaacson, Alejandro Rivas
OBJECTIVE: To evaluate the audiometric outcomes following endoscopic ossicular chain reconstruction (OCR). STUDY DESIGN: Retrospective case series. SETTING: Two tertiary referral centers. PATIENTS: Sixty two ears with ossicular discontinuity. INTERVENTION(S): Endoscopic and microscopic OCR in patients with ossicular discontinuity. MAIN OUTCOME MEASURES: Bone and air pure-tone averages (PTA), air-bone gap (ABG), and word recognition scores (WRS)...
October 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28731593/synthesis-characterization-and-efficient-catalytic-activities-of-a-nickel-ii-porphyrin-remarkable-solvent-and-substrate-effects-on-participation-of-multiple-active-oxidants
#7
Hye Mi Ahn, Jeong Mi Bae, Min Jeong Kim, Kwon Hee Bok, Ha Young Jeong, Suk Joong Lee, Cheal Kim
A new nickel(II) porphyrin complex, [Ni(II) (porp)] (1), has been synthesized and characterized by (1) H NMR, (13) C NMR and mass spectrometry analysis. This Ni(II) porphyrin complex 1 quantitatively catalyzed the epoxidation reaction of a wide range of olefins with meta-chloroperoxybenzoic acid (m-CPBA) under mild conditions. Reactivity and Hammett studies, H2(18) O-exchange experiments, and the use of PPAA (peroxyphenylacetic acid) as a mechanistic probe suggested that participation of multiple active oxidants Ni(II) -OOC(O)R 2, Ni(IV) -Oxo 3, and Ni(III) -Oxo 4 within olefin epoxidation reactions by the nickel porphyrin complex is markedly affected by solvent polarity, concentration, and type of substrate...
July 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28727263/hearing-outcomes-of-incus-interposition-versus-titanium-partial-ossicular-replacement-prostheses-our-experience-in-115-patients
#8
Elisabeth Sterrer, Benjamin Loader
Both, PORP and incus interpositions, are valuable techniques for the reconstruction of the conductive mechanism. In our study we were able to show that, in certain aspects, the audiological outcome was better in incus remodelling reconstruction than in PORP placement. A detailed analysis of all frequencies showed significantly better results in the incus group especially for the frequencies 250Hz, 1000Hz, 2000Hz and 3000Hz. If clinical conditions warrant it, a reconstruction of the ossicular chain with incus interposition may be preferred to PORP...
July 20, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28688567/factors-influencing-hearing-outcomes-in-pediatric-patients-undergoing-ossicular-chain-reconstruction
#9
Nandini Govil, Thomas M Kaffenberger, Amber D Shaffer, David H Chi
OBJECTIVE: Ossicular chain disruption in children leads to conductive hearing loss. Few studies have focused on factors influencing successful results in pediatric ossicular chain reconstruction (OCR). We aim to determine whether demographic or surgical factors affect hearing outcomes in pediatric OCR. METHODS: We conducted a retrospective chart review of 120 patients undergoing OCR at our institution, a tertiary care hospital, between 2003 and 2014, with median length of follow-up of 2...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28499303/-long-term-follow-up-and-patient-satisfaction-after-tympanoplasty-with-titanium-clip-prothesis
#10
Guido Wolferts, Daniel Schicke, K-Wolfgang Delank
Aim of the present study is to evaluate the long term results of ossiculoplasty using titanium clip prosthesis. A retrospective analysis with prospective follow-up has been done including for all patients who had a Clip-PORP implanted between the years 2002-2013. Following this, audiometric hearing results were measured with clinical examination including otoscopy and quality of life evaluation using Glasgow benefit inventory. 48 patients (51 ears, 29 men, 19 women, average age 44.1 years) received followed up after an average duration of 6...
May 12, 2017: Laryngo- Rhino- Otologie
https://www.readbyqxmd.com/read/28390607/endoscopic-middle-ear-exploration-in-pediatric-patients-with-conductive-hearing-loss
#11
John M Carter, Stephen R Hoff
OBJECTIVE: To describe our indications, findings, and outcomes for transcanal endoscopic middle ear exploration in pediatric patients with conductive hearing loss of unknown etiology, without effusions. METHODS: Prospective case series for all pediatric patients undergoing totally endoscopic transcanal middle ear exploration between April 2012 and October 2015 at a pediatric tertiary care referral hospital. Demographic data, operative findings, and hearing results were reviewed...
May 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28277483/endoscopy-assisted-ear-surgery-for-treatment-of-chronic-otitis-media-with-cholesteatoma-adhesion-or-retraction-pockets
#12
Cagatay Han Ulku
The objective of this study was to analyze the results of endoscopy-assisted ear surgery for the treatment of chronic otitis media with cholesteatoma, adhesion, or retraction pockets.Fifty-one patients who underwent oto-endoscopy-assisted canal wall up tympanomastoid surgery and/or limited anterior atticotomy with tympanoplasty for chronic otitis media with cholesteatoma, adhesion, or retraction pocket from 2006 to 2013 have been included in this study. Eradication of the disease from the middle ear and mastoid air cells was achieved by combination of the oto-microscobic and oto-endoscopic approaches...
June 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28274901/a-comparison-study-of-partial-ossicular-reconstruction-prosthesis-porp-placement-under-the-malleus-or-tympanic-membrane-graft-in-the-presence-of-the-malleus
#13
Ahmet Mutlu, Özlem Topdağ, Murat Topdağ, Mete İşeri, Selvet Erdoğan
OBJECTIVE: The aim of this study was to compare the hearing results of embedding the partial ossicular reconstruction prosthesis (PORP) underneath the malleus with the malleus relocation technique and tympanic membrane graft in the presence of the malleus. MATERIALS AND METHODS: A retrospective review of patient charts and audiometric results in a tertiary referral center was conducted. In total, 83 patients who underwent intact canal tympanoplasty with mastoidectomy between 2010 and 2015 were included and divided into two different groups: malleus assembly to the stapes head (MASH) and tympanic membrane assembly to the stapes head (TASH)...
August 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28079680/middle-ear-sound-transmission-under-normal-damaged-repaired-and-reconstructed-conditions
#14
Wei Dong, Ying Tian, Xin Gao, Timothy T K Jung
HYPOTHESIS: We hypothesize that current clinical treatment strategies for the disarticulated or eroded incus have the effect of combining the incus and stapes of the human middle ear (ME) into one rigid structure, which, while capable of adequately transmitting lower-frequency sounds, fails for higher frequencies. BACKGROUND: ME damage causes conductive hearing loss (CHL) and while great progress has been made in repairing or reconstructing damaged MEs, the outcomes are often far from ideal...
April 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/27999999/cartilage-island-on-stapes-autologous-porp-in-the-hypoventilated-middle-ear
#15
Jeanette Hess-Erga, Bart Lambertus Henricus Jozef Engelen, Flemming Slinning Vassbotn
The most common technique in sound restoration of the middle ear is prosthetic surgery. Hypoventilation of the middle ear may cause adhesive otitis or atelectasis resulting in a higher risk of prosthetic extrusion rate and recurrence of the underlying cholesteatoma. We report long-term results using an island of tragal cartilage as an autologous PORP in selected patients with poor middle ear ventilation. Retrospective chart reviews were performed for procedures involving 52 patients between year 2000 and 2009...
April 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27837423/the-effects-of-surgery-type-and-different-ossiculoplasty-materials-on-the-hearing-results-in-cholesteatoma-surgery
#16
Sultan Şevik Eliçora, Duygu Erdem, Aykut Erdem Dinç, Murat Damar, Sultan Bişkin
To investigate the effects of surgery type [intact canal wall (ICW) or canal wall down (CWD) mastoidectomy] and different ossiculoplasty materials on hearing outcome in single-staged cholesteatoma surgery. A retrospective case-control study. A total of 116 cases (97 adults, 29 children) underwent surgery, including ossiculoplasty, between 2012 and 2015 for cholesteatoma. Patients who had undergone surgery for the first time, and whose grafts were successful, were included in the study. Patients with adhesive otitis media, unsuccessful grafts, revision and recurrent cases, radical mastoidectomy, and craniofacial anomalies were excluded...
February 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27630829/the-porx-response-regulator-of-the-porphyromonas-gingivalis-porxy-two-component-system-does-not-directly-regulate-the-type-ix-secretion-genes-but-binds-the-porl-subunit
#17
Maxence S Vincent, Eric Durand, Eric Cascales
The Type IX secretion system (T9SS) is a versatile multi-protein complex restricted to bacteria of the Bacteriodetes phylum and responsible for the secretion or cell surface exposition of diverse proteins that participate to S-layer formation, gliding motility or pathogenesis. The T9SS is poorly characterized but a number of proteins involved in the assembly of the secretion apparatus in the oral pathogen Porphyromonas gingivalis have been identified based on genome substractive analyses. Among these proteins, PorY, and PorX encode typical two-component system (TCS) sensor and CheY-like response regulator respectively...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27509186/structural-insights-into-the-pork-and-porn-components-of-the-porphyromonas-gingivalis-type-ix-secretion-system
#18
Dhana G Gorasia, Paul D Veith, Eric G Hanssen, Michelle D Glew, Keiko Sato, Hideharu Yukitake, Koji Nakayama, Eric C Reynolds
The type IX secretion system (T9SS) has been recently discovered and is specific to Bacteroidetes species. Porphyromonas gingivalis, a keystone pathogen for periodontitis, utilizes the T9SS to transport many proteins including the gingipain virulence factors across the outer membrane and attach them to the cell surface via a sortase-like mechanism. At least 11 proteins have been identified as components of the T9SS including PorK, PorL, PorM, PorN and PorP, however the precise roles of most of these proteins have not been elucidated and the structural organization of these components is unknown...
August 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27220292/-analyses-of-the-operative-efficacy-of-102-cases-of-acquired-middle-ear-cholesteatoma
#19
Bo Yang, Xuejun Jiang, Ning Yang, Lian Hui, Buquan Wang, Yu Sun
OBJECTIVE: To investigate the efficacy of operations of acquired middle ear cholesteatoma. METHODS: Retrospectively analyzed clinical data of 102 patients whom received tympanoplasty with CWU or CWD with mastoid obliteration in our hospital between January 2014 and December 2014. Patients were divided into different groups according to types of the cholesteatoma as well as the different surgical procedures. Patients were followed up for 12-24 months, the pre and post-operative PTA was performed and evaluated...
May 2016: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/27118255/comparison-of-various-bone-cement-ossiculoplasty-techniques-and-functional-results
#20
COMPARATIVE STUDY
Volkan Gungor, Gamze Atay, M Demir Bajin, Mehmet Yarali, Sarp Sarac, Levent Sennaroglu
OBJECTIVE: In this study, functional results of different bone cement ossiculoplasty techniques are compared. METHODS: Retrospective case review at a tertiary referral center. Patients who underwent middle ear surgery and bone cement ossiculoplasty between 2006-2012 were included. A total of 52 patients, including 30 patients with 'Incus to stapes' (Group 1) and 13 patients with 'malleus to stapes' (Group 2), five patients with 'incudoplasty + stapedotomy' (Group 3), and four patients with 'malleus to incus' (Group 4) ossiculoplasty were enrolled in the study...
September 2016: Acta Oto-laryngologica
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