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https://www.readbyqxmd.com/read/28544228/synthesis-of-benzodihydrofurans-by-asymmetric-c-h-insertion-reactions-of-donor-donor-carbenoids
#1
Jared Thomas Shaw, Kellan N Lamb, Richard A Squitieri, Srinivasa R Chintala, Ada J Kwong, Edward I Balmond, Cristian Soldi, Olga Dmytrenko, Marta Castiñeira Reis, Ryan Chung, J Bennett Addison, James C Fettinger, Jason C Hein, Dean J Tantillo, Joseph M Fox
Metal carbenoids appended with two electron-donating groups, known as "donor/donor" carbenoids, undergo diastereo- and enantioselective rhodium-catalyzed C-H insertion reactions with ether substrates to form benzodihydrofurans. Unlike the reactions of carbenoids with electron-withdrawing groups attached, the attenuated electrophilicity enables these reactions to be conducted in Lewis basic solvents (e.g., acetonitrile) and in the presence of water. The diazo precursors for these species are prepared in situ from hydrazone using a mild and chemoselective oxidant (MnO2)...
May 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28544022/covalently-modified-graphenes-in-catalysis-electrocatalysis-and-photoresponsive-materials
#2
Sergio Navalon, Jose Raul Herance, Mercedes Alvaro, Hermenegildo García
Ideal graphene is a one-atom thick single layer of carbon atoms having sp2 hybridation in hexagonal arrangement. Due to their large surface area and good dispersability in common solvents, graphenes are suitable platforms to anchor covalently units. The appended unit can introduce additional functionality to graphene. Although the field of covalently modified graphene is still starting compared to the development of other carbon nanoforms, there is alrady many examples describing the use of modified graphenes as recoverable photo-, electro- and catalysts as well as in non-linear optics and to improve mechanical resistance and solubility of graphenes...
May 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28540974/neuroendocrine-neoplasms-of-the-small-intestine-and-appendix-management-guidelines-recommended-by-the-polish-network-of-neuroendocrine-tumours
#3
Tomasz Bednarczuk, Marek Bolanowski, Anna Zemczak, Agata Bałdys-Waligórska, Jolanta Blicharz-Dorniak, Agnieszka Boratyn-Nowicka, Małgorzata Borowska, Andrzej Cichocki, Jarosław B Ćwikła, Massimo Falconi, Wanda Foltyn, Daria Handkiewicz-Junak, Alicja Hubalewska-Dydejczyk, Barbara Jarząb, Roman Junik, Dariusz Kajdaniuk, Grzegorz Kamiński, Agnieszka Kolasińska-Ćwikła, Aldona Kowalska, Robert Król, Leszek Królicki, Jolanta Kunikowska, Katarzyna Kuśnierz, Paweł Lampe, Dariusz Lange, Anna Lewczuk-Myślicka, Andrzej Lewiński, Michał Lipiński, Magdalena Londzin-Olesik, Bogdan Marek, Anna Nasierowska-Guttmejer, Ewa Nowakowska-Duława, Jakub Pałucki, Joanna Pilch-Kowalczyk, Violetta Rosiek, Marek Ruchała, Lucyna Siemińska, Anna Sowa-Staszczak, Teresa Starzyńska, Katarzyna Steinhof-Radwańska, Janusz Strzelczyk, Krzysztof Sworczak, Anhelli Syrenicz, Andrzej Szawłowski, Marek Szczepkowski, Ewa Wachuła, Wojciech Zajęcki, Wojciech Zgliczyński, Beata Kos-Kudła
This study presents the revised Polish guidelines regarding the management of patients suffering from neuroendocrine neoplasms (NENs) of the small intestine and appendix. The small intestine, especially the ileum, is the most common location for these neoplasms. Most are well differentiated and slow growing. Their symptoms may be atypical, which can result in delayed or accidental diagnosis. Appendicitis is usually the first manifestation of NEN in this location. Typical symptoms of carcinoid syndrome occur in approximately 20-30% of patients suffering from small intestinal NENs with distant metastases...
2017: Endokrynologia Polska
https://www.readbyqxmd.com/read/28540053/euglycaemic-ketoacidosis-in-a-non-diabetic-primigravida-following-an-appendicectomy
#4
Dinushi Dilanka Dikowita, Thirunavukarasu Kumanan, Kopalasuntharam Muhunthan, Janaki Arulmoli
Pregnancy creates significant alterations in energy metabolism which itself is a physiological adaptation to provide continuous flow of energy metabolites to the foetus. The state of insulin resistance created by hormonal changes in pregnancy enables free flow of glucose to the foetus and allows its absorption through facilitated diffusion. As glucose is preferentially available for the foetus, maternal fasting glucose level would be less than that of a non-pregnant state and in contrast plasma ketones and free fatty acids levels are elevated, resulting in a state of accelerated starvation...
2017: SAGE open medical case reports
https://www.readbyqxmd.com/read/28538626/the-capacity-of-icd-10-cm-pcs-to-characterize-surgical-care
#5
Garth H Utter, Kevin M Schuster, Preston R Miller, Nathan T Mowery, Suresh K Agarwal, Robert J Winchell, Marie L Crandall
The International Classification of Diseases, 10th edition, Clinical Modification and Procedure Coding System (ICD-10-CM/PCS) have been in effect since October 1, 2015 and offer much greater capacity than previous classifications to characterize the nature and treatment of surgical conditions. However, the diagnosis codes of ICD-10-CM are unevenly specific across the spectrum of surgical conditions and currently do not adequately allow description of important distinctions in disease severity for many common surgical conditions...
May 22, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28538430/acute-appendicitis
#6
Timothy M Hirsch
No abstract text is available yet for this article.
June 2017: JAAPA: Official Journal of the American Academy of Physician Assistants
https://www.readbyqxmd.com/read/28537721/multivariate-chiral-covalent-organic-frameworks-with-controlled-crystallinity-and-stability-for-asymmetric-catalysis
#7
Jie Zhang, Xing Han, Xiaowei Wu, Yan Liu, Yong Cui
The modular construction of covalent organic frameworks (COFs) provides a convenient platform for designing high-performance functional materials, but the synthetic control over their chirality has been relatively little attended. Here we report a multiple-component strategy to construct chiral COFs (CCOFs) with controlled crystallinity and stability for heterogeneous asymmetric catalysis. By crystallizing mixtures of triamines with and without chiral organocatalysts and a dialdehyde, a family of two- and three-component 2D porous CCOFs that adopt three different stacking modes is prepared...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28535960/nonoperative-management-in-children-with-early-acute-appendicitis-a-systematic-review
#8
REVIEW
Jane Xu, Susan Adams, Yingrui Cyril Liu, Jonathan Karpelowsky
PURPOSE: Appendectomy has remained the gold standard treatment of acute appendicitis for more than 100years. Nonoperative management (NOM) has been shown to be a valid treatment alternative for acute uncomplicated appendicitis in adults. A systematic review of available evidence comparing operative management (OM) and NOM in children with acute uncomplicated appendicitis was performed. METHODS: Systematic searches of MedLine, Embase, and a clinical trial register (https://clinicaltrials...
May 11, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28532764/sonography-of-suspected-acute-appendicitis-in-children-evaluation-of-the-progress-in-performance-of-senior-residents
#9
Pierre Gerbier, Aurélien Binet, Mathilde Etancelin, Emmanuel Barteau, Marie Auger, Luciano Morales, Philippe Bertrand, Dominique Sirinelli, Baptiste Morel
PURPOSE: The objective of this study was to evaluate the progress in performance of senior residents in diagnosing acute appendicitis. MATERIAL AND METHODS: Results were collected and compared of ultrasound examinations performed for suspected acute appendicitis by three senior residents and two faculty members over a six-month period in a university hospital setting. A grid with the sonographic findings was completed separately by the residents and the faculty members immediately after each examination...
May 16, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28531869/a-rare-case-of-subacute-appendicitis-actinomycosis-as-the-final-pathology-reports-a-case-report-and-literature-review
#10
G A Gómez-Torres, O S Ortega-Gárcia, E G Gutierrez-López, C A Carballido-Murguía, J A Flores-Rios, C R López-Lizarraga, C A Bautista López, C F Ploneda-Valencia
INTRODUCTION: Acute appendicitis is the most common indication for an emergency abdominal surgery in the world, with a lifetime incidence of around 10%. Actinomycetes are the etiology of appendicitis in only 0.02%-0.06%, having as the final pathology report a chronic inflammatory response; less than 10% of the cases are diagnosed before surgery. Here, we present the case of a subacute appendicitis secondary to actinomycosis. CASE REPORT: A 39-year-old male presented with a twelve-day evolution of intermittent abdominal pain in the right lower quadrant, treated at the beginning with ciprofloxacin and urinary analgesic...
May 15, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28530777/clinicopathological-analysis-of-patients-operated-for-appendiceal-mucocele
#11
Hasan Abuoğlu, Mehmet Kamil Yıldız, Bülent Kaya, Mehmet Odabaşı
BACKGROUND: The term mucocele refers to the dilatation of the appendix due to mucus, and it is an uncommon disorder with an estimated incidence of 0.2%-0.3% of all appendectomies performed and 8%-10% of all appendiceal tumors. It is often asymptomatic, but may manifest appendicitis-like symptoms. METHODS: Twenty-six patients (14 females and 12 males) were operated on due to mucocele of the appendix. Sixteen patients exhibiting the characteristics of clinically acute appendicitis required an emergency operation...
May 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28530770/diagnostic-value-of-appendicular-doppler-ultrasonography-in-acute-appendicitis
#12
Hüseyin Uzunosmanoğlu, Yunsur Çevik, Şeref Kerem Çorbacıoğlu, Emine Akıncı, Hakan Buluş, Kadir Ağladıoğlu
BACKGROUND: Acute appendicitis is one of the most common causes of acute abdominal pain prompting emergency department (ED) visits. It is critical for the physicians to promptly and accurately diagnose acute appendicitis. The present study aimed to evaluate the diagnostic efficacy of Doppler ultrasonography (USG) in patients with acute appendicitis and compare this new method with other commonly used radio-diagnostic tools. METHODS: All patients who were diagnosed with acute appendicitis at the Kecioren Training and Research Hospital ED and later underwent appendectomy between October 2012 and April 2013 were included in the study...
May 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28529250/impact-of-jaw-position-accuracy-on-dose-variation-in-volumetric-modulated-arc-therapy-using-jaw-tracking
#13
Fumiyasu Matsubayashi, Yuki Koizumi, Ryo Takahashi, Minoru Yoshioka, Tomoharu Sato
The technique of jaw tracking can be used in volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT). In this technique, jaw tracks apertures of the multi leaf collimator (MLC) during irradiation. It is reported that dose variation is occurred by the changing accuracy of MLC position in VMAT and IMRT. Though jaw moves dynamically in the irradiation by using this technique, the influence of the jaw position accuracy on dose variation is not examined. The purpose of this study is to verify the influence of jaw position accuracy on dose variation in VMAT using jaw tracking...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28528712/timing-of-antimicrobial-prophylaxis-and-infectious-complications-in-pediatric-patients-undergoing-appendectomy
#14
Cristen N Litz, Jessica B Asuncion, Paul D Danielson, Nicole M Chandler
PURPOSE: Antibiotic administration within one hour prior to incision is a common quality metric; however, antibiotics are typically started at the time of diagnosis in pediatric patients with acute appendicitis. The purpose was to determine if antibiotic administration within one hour prior to incision reduces the incidence of surgical site infections (SSI) in pediatric patients with acute appendicitis started on parenteral antibiotics upon diagnosis. METHODS: A retrospective review was performed of 478 patients aged 0-18years who underwent appendectomy for acute appendicitis from 7/2013 to 4/2015...
May 11, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28523021/single-incision-laparoscopic-appendectomy-for-acute-appendicitis-using-a-10-mm-laparoscope-and-the-glove-port-technique
#15
Takaaki Tsushimi, Hirohito Mori, Manabu Sudo, Yoshihide Minami, Koichi Ueki, Makoto Tamai
OBJECTIVE: To evaluate the single incision laparoscopic appendectomy (SILA) using existing instruments, the 10-mm laparoscope, and glove port technique. METHODS: SILA was performed on 16 patients (8 male cases, 8 female cases) between June 2012 and September 2015. A 20-mm incision was made in the umbilicus and a wound retractor was placed. A 10-mm trocar for the laparoscope and two 5-mm trocars were fixed to the three fingers of the latex gloves and it was attached to the wound retractor...
March 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28522912/recent-upper-gastrointestinal-panendoscopy-increases-the-risk-of-pyogenic-liver-abscess
#16
Ming-Jen Tsai, Chin-Li Lu, Ying C Huang, Chung Hsien Liu, Wan-Ting Huang, Kai-Yuan Cheng, Solomon Chih-Cheng Chen
AIM: To investigate the association between a recent gastrointestinal (GI) endoscopy and the subsequent risk of pyogenic liver abscess (PLA). METHODS: We designed a nested case control study. Using the Taiwan National Health Insurance Research Database, 2135 patients with a first diagnosis of PLA were identified from 1998 to 2011. Another 10675 patients without PLA matched by age and sex were selected as reference controls. We identified and compared the possible risk factors for PLA and GI endoscopies performed before the index date (when PLA was diagnosed) between the two cohorts...
April 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28522902/non-invasive-evaluation-of-intestinal-disorders-the-role-of-elastographic-techniques
#17
REVIEW
Federica Branchi, Flavio Caprioli, Stefania Orlando, Dario Conte, Mirella Fraquelli
Over the recent years the non-invasive techniques for the evaluation of the small bowel have been playing a major role in the management of chronic intestinal diseases, such as inflammatory bowel diseases (IBD). The diagnostic performances of magnetic resonance imaging, computed tomography and ultrasound in the field of small bowel disorders, have been assessed and established for more than two decades. Newer sonographic techniques, such as strain elastography and shear wave elastography, have been put forward for the assessment of disease activity and characterization of IBD-related damage in the setting of Crohn's disease and other gastrointestinal disorders...
April 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28516767/synthesis-and-structure-of-3-3-dimethylindoline-squaraine-rotaxanes
#18
Tia Jarvis, Carleton G Collins, Janel M Dempsey, Allen G Oliver, Bradley D Smith
Squaraine rotaxanes are mechanically interlocked molecules comprised of a dumbbell shaped squaraine dye inside a tetralactam macrocycle. Previous squaraine rotaxanes have employed planar squaraine dyes with 4-aminophenyl, 2-aminothiophene or N-amino units appended to the central C4O2 core. Here we describe two rotaxanes that encapsulate a 3,3-dimethylindoline squaraine inside a tetralactam with anthracene sidewalls. The rotaxanes were prepared by a templated clipping reaction and an X-ray crystal structure shows that the squaraine gem-dimethyl groups force a relatively wide separation between the macrocycle anthracene sidewalls...
May 18, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28515697/trpa1-channels-modify-trpv1-mediated-current-responses-in-dorsal-root-ganglion-neurons
#19
Takayoshi Masuoka, Makiko Kudo, Yuka Yamashita, Junko Yoshida, Noriko Imaizumi, Ikunobu Muramatsu, Matomo Nishio, Takaharu Ishibashi
The transient receptor potential vanilloid 1 (TRPV1) channel is highly expressed in a subset of sensory neurons in the dorsal root ganglia (DRG) and trigeminal ganglia of experimental animals, responsible for nociception. Many researches have revealed that some TRPV1-positive neurons co-express the transient receptor potential ankyrin 1 (TRPA1) channel whose activities are closely modulated by TRPV1 channel. However, it is less investigated whether the activities of TRPV1 channel are modulated by the presence of TRPA1 channel in primary sensory neurons...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28514306/unusual-case-of-rapid-growing-intraabdominal-abscess-caused-by-stenotrophomonas-maltophilia-after-laparoscopic-appendectomy-due-to-perforated-appendicitis-a-case-report
#20
Dae Ro Lim, Jung Cheol Kuk, Taehyung Kim, Eung Jin Shin
INTRODUCTION: An intraabdominal abscess due to Stenotrophomonas maltophilia (S maltophilia) infection is a very rare clinical manifestation. S maltophilia is a glucose nonfermentative, aerobic, gram-negative, mobile, and biofilm-forming bacterium. It is an opportunistic pathogen and uncommon cause of infection. Respiratory tract infections (pneumonia) and bloodstream infections (bacteremia) are the most common clinical manifestations of S maltophilia infection. CONCLUSIONS: This case report describes an unusual case of a rapidly growing, extremely large intraabdominal abscess (within 1 week during antibiotic therapy), which was detected 2 weeks after a laparoscopic appendectomy was performed for perforated appendicitis and was caused by multidrug-resistant S maltophilia infection...
May 2017: Medicine (Baltimore)
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