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https://www.readbyqxmd.com/read/27859768/evolution-of-a-polyene-cyclization-cascade-for-the-total-synthesis-of-cyclosmenospongine
#1
Klaus Speck, Thomas Magauer
We report a full account on the development of a unique cationic polyene cyclization for the total synthesis of the tetracyclic meroterpenoid (-)-cyclosmenospongine. A highly convergent three-component coupling strategy enabled rapid access to individual cyclization precursors that were tested for their reactivity. The successful transformation generates three rings and sets four consecutive stereocenters in a single operation proceeding in a highly efficient manner to give exclusively the trans-decalin framework...
November 17, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27852082/intraductal-necrosectomy-for-pancreatic-walled-off-necrosis-using-novel-single-operator-pancreatoscope
#2
Takeshi Ogura, Wataru Takagi, Saori Onda, Tastsushi Sano, Kazuhide Higuchi
No abstract text is available yet for this article.
January 2016: Endoscopy
https://www.readbyqxmd.com/read/27843249/in-vitro-evaluation-of-stainless-steel-crowns-cemented-with-resin-modified-glass-ionomer-and-two-new-self-adhesive-resin-cements
#3
REVIEW
Sidhant Pathak, K K Shashibhushan, P Poornima, Vv Subba Reddy
AIMS: To assess and compare the retentive strength of two dual-polymerized self-adhesive resin cements (RelyX U200, 3M ESPE & SmartCem2, Dentsply Caulk) and a resin-modified glass ionomer cement (RMGIC; RelyX Luting 2, 3M ESPE) on stainless steel crown (SSC). MATERIALS AND METHODS: Thirty extracted teeth were mounted on cold cured acrylic resin blocks exposing the crown till the cemento-enamel junction. Pretrimmed, precontoured SSC was selected for a particular tooth...
July 2016: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/27836550/temporomandibular-joint-tmj-arthroscopic-lysis-and-lavage-outcomes-and-rate-of-progression-to-open-surgery
#4
Omar Breik, Vishakha Devrukhkar, George Dimitroulis
PURPOSE: Arthroscopic lysis and lavage has been shown to be effective in the management of a variety of TMJ (Temporomandibular joint) diseases. The purpose of this study was to evaluate the medium to long-term outcomes of TMJ arthroscopic lysis and lavage and determine factors associated with progression to open surgery. MATERIALS AND METHODS: A retrospective cohort study of a single operator series was performed over a 6-year period from 2006 to 2012. The variables of gender, age and category (Dimitroulis classification) were compared to evaluate factors associated with success of arthroscopy and progression to open surgery...
October 5, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/27824450/measuring-incompatible-observables-by-exploiting-sequential-weak-values
#5
F Piacentini, A Avella, M P Levi, M Gramegna, G Brida, I P Degiovanni, E Cohen, R Lussana, F Villa, A Tosi, F Zappa, M Genovese
One of the most intriguing aspects of quantum mechanics is the impossibility of measuring at the same time observables corresponding to noncommuting operators, because of quantum uncertainty. This impossibility can be partially relaxed when considering joint or sequential weak value evaluation. Indeed, weak value measurements have been a real breakthrough in the quantum measurement framework that is of the utmost interest from both a fundamental and an applicative point of view. In this Letter, we show how we realized for the first time a sequential weak value evaluation of two incompatible observables using a genuine single-photon experiment...
October 21, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27813414/switching-selectivity-of-alpha-enolic-dithioesters-one-pot-access-to-functionalized-1-2-and-1-3-dithioles
#6
Suvajit Koley, Tanmoy Chanda, Subhasis Samai, Maya Shankar Singh
An operationally simple cascade protocol has been developed for the construction of 1,2- and 1,3-dithiole derivatives from α-enolic dithioesters. 1,2-Dithioles are achieved by the reaction of dithioesters with elemental sulfur in the presence of InCl3 under solvent-free conditions. 1,3-Dithioles have been constructed via DABCO mediated self-coupling of dithioesters in open air enabling the formation of two new CS bonds and one ring in a single operation in contiguous fashion. The reactions proceeded smoothly affording the desired sulfur-rich heterocycles in good to excellent yields, exhibiting gram-scale ability and broad functional groups tolerance utilizing easy to handle cheap and easily available reagents...
November 4, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27813159/a-novel-shrug-technique-for-totally-implantable-venous-access-devices-via-the-external-jugular-vein-a-consecutive-series-of-254-patients
#7
Tetsuya Kagawa, Satoshi Ueyama, Tatsunori Kobayashi, Hiroki Okabayashi, Shinji Kuroda, Toshiyoshi Fujiwara
BACKGROUND: The external jugular vein (EJV) approach for totally implantable venous access devices (TIVADs) is safe. However, the success rate is unsatisfactory because of the difficulty in catheterization due to the acute angle between the EJV and the subclavian vein (SCV). A novel "shrug technique" to overcome this difficulty was developed, and its efficacy was assessed in a consecutive case series. METHODS: TIVAD placement was performed via the EJV cut-down approach...
November 4, 2016: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27796583/does-modern-space-suit-reduce-intraoperative-contamination-in-total-joint-replacement-an-experimental-study
#8
Daisuke Nakajima, Toshiyuki Tateiwa, Toshinori Masaoka, Yasuhito Takahashi, Takaaki Shishido, Kengo Yamamoto
BACKGROUND: The purpose of this study was to evaluate a potential risk of intraoperative contamination associated with clothing systems and surgeon's motion in total joint replacement. METHODS: The airborne particle concentrations at different locations around a single operating surgeon wearing standard surgical gown (SG) or modern "space suit" (SS) were compared. The particles in the size of ≥0.5 μm (roughly corresponding to a mean diameter of squamous epithelial cells) were counted at the following three locations: (1) ≈10 cm inferior to the wrist; (2) ≈10 cm posterior to the feet; and (3) near the chest (operative field) under condition either with or without the surgeon's motion (stepping in place at ~1 Hz)...
October 31, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/27781047/functional-independence-following-endovascular-treatment-for-basilar-artery-occlusion-despite-extensive-bilateral-pontine-infarcts-on-diffusion-weighted-imaging-refuting-a-self-fulfilling-prophecy
#9
Diogo C Haussen, Renato A C Oliveira, Vikas Patel, Raul G Nogueira
BACKGROUND AND PURPOSE: Extensive brainstem diffusion-weighted imaging (DWI) hyperintensity has been associated with poor outcomes. We aim at documenting a series of patients with extensive DWI pontine lesions who achieved independence following endovascular therapy and aggressive medical therapy in the setting of posterior circulation basilar artery occlusion (BAO). METHODS: This is a retrospective endovascular database review of a single-operator experience over a 9-year period for patients with (1) complete BAO, (2) extensive bilateral pontine DWI changes and (3) 90-day modified Rankin scale 0-2...
September 2016: Interventional Neurology
https://www.readbyqxmd.com/read/27769322/pars-plana-vitrectomy-with-silicone-oil-tamponade-in-failed-scleral-buckle-surgery
#10
Güner Ö Üney, Mehmet A Acar, Nurten Ünlü, Dicle Hazirolan, Zuleyha Yalniz-Akkaya, Firdevs Örnek
OBJECTIVE: This study aimed to evaluate the anatomical and functional outcomes of secondary pars plana vitrectomy (PPV) after failed scleral buckling (SB) surgery and to compare it with primary PPV for rhegmatogenous retinal detachment (RRD), including complicated proliferative vitreoretinopathy cases. DESIGN: Retrospective series in a tertiary care centre. PARTICIPANTS: One hundred and twenty consecutive patients. METHODS: The medical records of patients who underwent PPV with silicone oil tamponade for RRD were reviewed...
October 2016: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/27747347/oxygen-diffusion-and-surface-exchange-in-the-mixed-conducting-oxides-srti1-yfeyo3-%C3%AE
#11
Veronika Metlenko, WooChul Jung, Sean R Bishop, Harry L Tuller, Roger A De Souza
Oxygen transport in the mixed ionic-electronic conducting perovskite-oxides SrTi1-yFeyO3-δ (with y = 0.5 and y = 1.0) was studied by oxygen isotope exchange measurements. Experiments were performed on thin-film samples that were grown by Pulsed Laser Deposition (PLD) on MgO substrates. Isotope penetration profiles were introduced by (18)O2/(16)O2 exchanges into the plane of the films at various temperatures in the range 773 < T/K < 973 at an oxygen activity aO2 = 0.5. Isotope profiles were determined subsequently by Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), and their analysis yielded tracer diffusion coefficients D* and oxygen surface exchange coefficients k*...
October 17, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27740462/bilateral-carpal-tunnel-surgery-in-one-operation-retrospective-study
#12
O Herisson, M Dury, E Rapp, F Marin-Braun
Carpal tunnel syndrome is the most common entrapment syndrome. The incidence of a bilateral condition varies between 22% and 87%. The aim of our study was to assess the level of satisfaction and the clinical outcomes in a group of patients operated on through a bilateral neurolysis on the median nerve in the carpal tunnel, in one operating session. This is a retrospective study involving patients with an electromyographic and clinical diagnosis of bilateral carpal tunnel syndrome. Patients were treated on an outpatient basis and the bilateral neurolysis was performed by endoscopy...
June 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27733050/tips-and-tricks-in-video-assisted-thoracoscopic-surgery-lobectomy
#13
Gaetano Di Rienzo, Corrado Surrente, Camillo Lopez, Giovanna Imbriglio, Gaetano Greco, Anna Lucia Urgese, Luigi Andriolo
In 2012, open procedures represented 63% of the total number of lobectomies performed in our unit; in 2015, video-assisted thoracoscopic surgery (VATS) lobectomy numbers increased up to 66% of the total number of lobectomies performed. When carrying out the procedures, we followed the guidelines presented by the International VATS Lobectomy Consensus Group regarding indications, contraindications, preoperative investigations and conversions. In view of 280 VATS major lung resections from May 2012 to May 2016, we describe some tips and tricks that can be useful in this surgical technique, from general principles to single operative procedures...
October 13, 2016: Future Oncology
https://www.readbyqxmd.com/read/27696456/systematic-review-with-meta-analysis-endoscopic-retrograde-cholangiopancreatography-based-modalities-for-the-diagnosis-of-cholangiocarcinoma-in-primary-sclerosing-cholangitis
#14
REVIEW
B Njei, T R McCarty, S Varadarajulu, U Navaneethan
BACKGROUND: The accuracy of current endoscopic modalities for diagnosing cholangiocarcinoma in primary sclerosing cholangitis (PSC) is suboptimal. AIM: To evaluate the comparative effectiveness of endoscopic retrograde cholangiopancreatography (ERCP)-based modalities, independently or in combination, for the diagnosis of cholangiocarcinoma in patients with PSC-induced biliary strictures. METHODS: Searches of PubMed, EMBASE, Web of Science and the Cochrane Library databases were performed through December 2015...
December 2016: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27682636/synthesis-of-6-12-epiminodibenzo-b-f-1-5-diazocines-via-an-ytterbium-triflate-catalyzed-ab2-three-component-reaction
#15
Isravel Muthukrishnan, Muthu Karuppasamy, Subbiah Nagarajan, C Uma Maheswari, Vittorio Pace, J Carlos Menéndez, Vellaisamy Sridharan
An efficient and selective procedure for the synthesis of epiminodibenzo[b,f][1,5]diazocines involving a AB2 three-component reaction is developed. Two equivalents of suitably substituted 2-aminoarylaldehydes reacted with arylamines in the presence of Yb(OTf)3 to afford the desired products in high yields. The reaction is highly atom-economic and waste-free, in addition to allowing the generation of two heterocyclic rings and four C-N bonds in a single operation. Significantly, this approach is complementary to the existing literature procedures, affording arylamine-derived products that could not be accessed previously...
October 5, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27667528/reanimation-surgery-in-patients-with-acquired-bilateral-facial-palsy
#16
D P Butler, K S Johal, D H Harrison, A O Grobbelaar
Acquired bilateral facial palsy is rare and causes difficulty with speech and eating, but dynamic reanimation of the face can reduce the effect of these problems. Of 712 patients who had these procedures during our study period, two had an acquired bilateral facial paralysis. In both, reanimation was completed in a single operation using a free-functional transfer of the latissimus dorsi muscle that was coapted to the masseteric branch of the trigeminal nerve. Both patients achieved excellent non-spontaneous excursion and an improvement in function...
September 22, 2016: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/27650385/-ultrasound-guided-central-venous-catheterization-syringe-free-approach
#17
Francisco Matias, Edgar Semedo, Cláudia Carreira, Paula Pereira
BACKGROUND AND OBJECTIVES: Central venous catheterization of the internal jugular vein is a commonly performed invasive procedure associated with a significant morbidity and even mortality. Ultrasound-guided methods have shown to improve significantly the success of the technique and are recommended by various scientific societies, including the American Society of Anesthesiologists. The aim of this report is to describe an innovative ultrasound-guided central line placement of the internal jugular vein...
September 17, 2016: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/27649848/intracardiac-versus-transesophageal-echocardiography-for-left-atrial-appendage-occlusion-with-watchman
#18
Antonio H Frangieh, Jasmina Alibegovic, Christian Templin, Oliver Gaemperli, Slayman Obeid, Robert Manka, Erik W Holy, Willibald Maier, Thomas F Lüscher, Ronald K Binder
BACKGROUND: Left atrial appendage occlusion (LAAO) is mostly performed by transesophageal echocardiography (TEE) guidance. Intracardiac echocardiography (ICE) may be an alternative imaging modality for LAAO that precludes the need for general anesthesia or sedation. METHODS AND RESULTS: All consecutive single center, single operator LAAO candidates were analyzed. Baseline clinical and procedural characteristics and in-hospital outcomes were compared between patients in whom a Watchman was implanted with ICE vs...
September 21, 2016: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/27649108/predictive-role-of-trimprob-associated-with-multiparametric-mri-in-the-diagnosis-of-prostate-cancer
#19
Gustavo Cardoso Guimaraes, Walter Henriques da Costa, Renato Almeida Rosa, Stênio Zequi, Ricardo Favaretto
OBJECTIVES: To evaluate the predictive value of TRIMprob test to detect prostate cancer (PCa) in patients referred to prostate biopsy (PB). MATERIAL AND METHODS: Patients with PSA <10ng/mL and rectal exam without findings suggestive of prostate cancer were selected for TRIMprob evaluation. Exam was performed by a single operator through transperineal approach. Patients admitted for the study were submitted to TRIMprob and multiparametric mag¬netic resonance (mpMRI) and posteriorly to PB...
September 20, 2016: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/27645491/neopuff-t-piece-resuscitator-does-device-design-affect-delivered-ventilation
#20
Murray Hinder, Pranav Jani, Archana Priyadarshi, Alistair McEwan, Mark Tracy
BACKGROUND: The T-piece resuscitator (TPR) is in common use worldwide to deliver positive pressure ventilation during resuscitation of infants <10 kg. Ease of use, ability to provide positive end-expiratory pressure (PEEP), availability of devices inbuilt into resuscitaires and cheaper disposable options have increased its popularity as a first-line device for term infant resuscitation. Research into its ventilation performance is limited to preterm infant and animal studies. Efficacy of providing PEEP and the use of TPR during term infant resuscitation are not established...
September 19, 2016: Archives of Disease in Childhood. Fetal and Neonatal Edition
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