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https://www.readbyqxmd.com/read/29782026/experimental-and-quantum-chemical-studies-of-anionic-analogues-of-n-heterocyclic-carbenes
#1
Haoyu Niu, Robert J Mangan, Andrey V Protchenko, Nicholas Phillips, Wiebke Unkrig, Christian Friedmann, Eugene L Kolychev, Rémi Tirfoin, Jamie Hicks, Simon Aldridge
A combination of quantum chemical and synthetic/crystallographic methods have been employed to probe electronic structure in two series of anionic ligands related to the well known N-heterocyclic carbene (NHC) class of donor. Analyses of (i) the respective frontier orbital energies/compositions for the 'free' ligands and the results of ETS-NOCV studies of the bonding in model group 11 complexes; and (ii) the structural metrics for (new) linear gold(i) compounds, have been used to probe the bonding in complexes of NHC ligands which incorporate a backbone-appended weakly-coordinating anion component (WCA-NHCs) and in systems featuring the isoelectronic (formally anionic) diazaborolyl ligand family...
May 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29780575/community-acquired-infection-to-raoultella-ornithinolytica-presenting-as-appendicitis-and-shock-in-a-healthy-individual
#2
Roy Hajjar, Frank Schwenter, Shih-Hann Su, Marie-Christine Gasse, Herawaty Sebajang
Raoultella ornithinolytica and Raoultella planticola are histamine-producing bacteria that are usually found in fish and water. They are associated with scombroid syndrome that presents with vomiting and flushing. A wide range of infections with these germs is reported, but mainly in fragile hospitalized patients with multiple comorbidities. We report the case of a 54-year-old healthy patient who presented with 24-hours abdominal pain, vomiting, flushing and shock. The abdominal examination showed guarding in the right lower quadrant (RLQ), and the abdominal CT scan images showed a thickened terminal ileum and a distended appendix...
May 2018: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/29779677/distinguishing-fecal-appendicular-peritonitis-from-purulent-appendicular-peritonitis
#3
M Mariage, C Sabbagh, T Yzet, H Dupont, A NTouba, J M Regimbeau
INTRODUCTION: Fecal appendicular peritonitis (FAP) is a poorly studied, rare form of acute appendicitis, corresponding to peritoneal inflammation with the presence of feces secondary to ruptured appendix. The purpose of this study was to describe FAP and to compare FAP with purulent appendicular peritonitis (PAP). PATIENTS AND METHODS: This single-center, retrospective study was conducted in consecutive patients to compare the FAP group and the PAP group. The primary endpoint was the 30-day postoperative morbidity and mortality according to the Clavien-Dindo classification...
April 9, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29778928/how-does-binuclear-zinc-amidohydrolase-fwda-work-in-the-initial-step-of-methanogenesis-from-formate-to-formyl-methanofuran
#4
Xue-Wei Zhang, Shi-Lu Chen
The initial step of methanogenesis is the fixation of CO2 to formyl-methanofuran (formyl-MFR) catalyzed by formyl-MFR dehydrogenase, which can be divided into two half reactions. Herein, the second half reaction catalyzed by FwdA (formyl-methanofuran dehydrogenase subunit A), i.e., from formate to formyl-methanofuran, has been investigated using density functional theory and a chemical model based on the X-ray crystal structure. The calculations indicate that, compared with other well-known di-zinc hydrolases, the FwdA reaction employs a reverse mechanism, including the nucleophilic attack of MFR amine on formate carbon leading to a tetrahedral gem-diolate intermediate, two steps of proton transfer from amine to formate moieties assisted by the Asp385, and the CO bond dissociation to form the formyl-MFR product...
May 11, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29778927/evaluation-of-99m-tc-sulfonamide-and-sulfocoumarin-derivatives-for-imaging-carbonic-anhydrase-ix-expression
#5
Misaki Nakai, Jihne Pan, Kuo-Shyan Lin, John R Thompson, Alessio Nocentini, Claudiu T Supuran, Yasuo Nakabayashi, Tim Storr
With the aim to prepare hypoxia tumor imaging agents, technetium(I) and rhenium(I) tricarbonyl complexes with dipyridylamine (L1 = N-{[1-(2,2-dioxido-1,2-benzoxathiin-6-yl)-1H-1,2,3-triazol-4-yl]methyl}-N-(2-pyridinylmethyl)-2-pyridinemethanamine; L3 = N-{[1-[N-(4-aminosulfonylphenyl)]-1H-1,2,3-triazol-4-yl]methyl}-N-(2-pyridinyl-methyl)-2-pyridinemethanamine), and iminodiacetate (H2 L2 = N-{[1-(2,2-dioxido-1,2-benzoxathiin-6-yl)-1H-1,2,3-triazole-4-yl]methyl}-N-(carboxy-methyl)-glycine; H2 L4 = N-{[1-[N-(4-aminosulfonylphenyl)]-1H-1,2,3-triazole-4-yl]methyl}-N-(carboxymethyl)-glycine) ligands appended to sulfonamide or sulfocoumarin carbonic anhydrase inhibitors were synthesized...
April 13, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29778032/primary-lymphoma-of-appendix-presenting-as-acute-appendicitis-a-case-report
#6
Giuseppe Caristo, Guido Griseri, Rosario Fornaro, Antonio Langone, Angelo Franceschi, Veronica Errigo, Cecilia Ferrari, Marco Casaccia, Marco Frascio, Angelo Schirru
INTRODUCTION: Primary lymphomas of appendix are extremely rare tumors. The incidence is 0.015% of all gastrointestinal lymphomas. PRESENTATION OF CASE: We present a case of a 75 year-old male patient who presented with acute abdominal pain in the lower right quadrant and fever. DISCUSSION: The patient received laparotomic appendectomy. The definitive histopathological examination revealed the presence of diffuse large cell B-lymphoma of the appendix...
May 7, 2018: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29777350/the-american-association-for-the-surgery-of-trauma-emergency-general-surgery-anatomic-severity-scoring-system-as-a-predictor-of-cost-in-appendicitis
#7
Eric J Finnesgard, Matthew C Hernandez, Johnathon M Aho, Martin D Zielinski
BACKGROUND: The World Society for Emergency Surgery determined that for appendicitis managed with appendectomy, there is a paucity of evidence evaluating costs with respect to disease severity. The American Association for the Surgery of Trauma (AAST) disease severity grading system is valid and generalizable for appendicitis. We aimed to evaluate hospitalization costs incurred by patients with increasing disease severity as defined by the AAST. We hypothesized that increasing disease severity would be associated with greater cost...
May 17, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29777269/pediatric-appendicitis-severity-in-kwazulu-natal-south-africa-a-retrospective-cohort-analysis
#8
Matthew C Hernandez, Victor Y Kong, John L Bruce, Johnathon M Aho, Grant L Laing, Martin D Zielinski, Damian L Clarke
BACKGROUND: Acute appendicitis is a common pediatric surgical emergency; however, there are few grading systems to assign disease severity. The American Association for the Surgery of Trauma (AAST) recently developed a grading system for a variety of emergency surgical conditions, including appendicitis. The severity of acute appendicitis in younger patients in KwaZulu-Natal (South Africa) is unknown. We aimed to describe the disease severity in this patient population using the AAST grading system hypothesizing that the AAST grade would correlate with morbidity, management type, and duration of stay...
May 17, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29775298/a-family-of-bodipy-photocages-cleaved-by-single-photons-of-visible-near-ir-light
#9
Julie A Peterson, Chamari Wijesooriya, Elizabeth J Gehrmann, Kaitlyn M Mahoney, Pratik P Goswami, Toshia R Albright, Aleem Syed, Andrew S Dutton, Emily A Smith, Arthur H Winter
Photocages are light-sensitive chemical protecting groups that provide external control over when, where, and how much of a biological substrate is activated in cells using targeted light irradiation. Regrettably, most popular photocages (e.g. o-nitrobenzyl groups) absorb cell-damaging ultraviolet wavelengths. A challenge with achieving longer wavelength bond-breaking photochemistry is that long-wavelength-absorbing chromophores have shorter excited state lifetimes and diminished excited state energies. However, here we report the synthesis of a family of BODIPY-derived photocages with tunable absorptions across the visible/near-IR that release chemical cargo under irradiation...
May 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29774904/investigating-subtle-4f-vs-5f-coordination-differences-using-kinetically-inert-eu-iii-tb-iii-and-cm-iii-complexes-of-a-coumarin-appended-1-4-7-10-tetraazacyclododecane-1-4-7-triacetate-do3a-ligand
#10
Anne Kathrine R Junker, Gauthier J-P Deblonde, Rebecca J Abergel, Thomas Just Sørensen
In order to reveal subtle differences between the solution chemistries of trivalent 4f and 5f elements, the physicochemical and photophysical properties of europium(iii), terbium(iii) and curium(iii) complexes formed with a 7-methoxy-coumarin appended 1,4,7,10-tetraazadodecane-1,4,7-triacid (DO3A) ligand were studied. All three complexes were found to be kinetically inert and exhibit stability constants similar to their 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) equivalents. The Cm(iii) and Eu(iii) complexes feature strong sensitised emission, while the triplet energy of the coumarin prohibits efficient sensitisation of the Tb(iii) analogue...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29769153/point-of-care-ultrasound-to-diagnose-appendicitis-in-a-canadian-emergency-department
#11
Sameer Sharif, Steven Skitch, Dean Vlahaki, Andrew Healey
OBJECTIVES: Appendicitis is a common surgical condition that frequently requires diagnostic imaging. Abdominal computed tomography (CT) is the gold standard for diagnosing appendicitis. Ultrasound offers a radiation-free modality; however, its availability outside business hours is limited in many emergency departments (EDs). The purpose of this study is to evaluate the test characteristics of emergency physician-performed point-of-care ultrasound (POCUS) to diagnose appendicitis in a Canadian ED...
May 17, 2018: CJEM
https://www.readbyqxmd.com/read/29767512/azide-and-dye-conjugated-coelenterazine-analogues-for-a-multiplex-molecular-imaging-platform
#12
Ryo Nishihara, Emi Hoshino, Yoshiki Kakudate, Satoshi Kishigami, Naoko Iwasawa, Shin-Ichi Sasaki, Takahiro Nakajima, Moritoshi Sato, Shigeru Nishiyama, Daniel Citterio, Koji Suzuki, Sung Bae Kim
Native coelenterazine (nCTZ) is a common substrate to most marine luciferases and photoproteins. In this study, nine novel dye- and azide-conjugated CTZ analogues were synthesized by conjugating a series of fluorescent dyes or an azide group to the C-2 or C-6 position of the nCTZ backbone to obtain bulkiness-driven substrate specificity and potential chemiluminescence/bioluminescence resonance energy transfer (C/BRET). The investigation on the optical properties revealed that azide-conjugated CTZs emit greatly biased bioluminescence to ALucs and ca...
May 16, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29764845/endoscopic-diagnosis-of-a-goblet-cell-carcinoid-tumour-of-the-appendix
#13
Vanessa Falk, Marcia Ballantyne, Sergio Zepeda-Gómez, Ali Kohansal-Vajargah
Primary malignancies of the appendix are rare. Of these, less than 5% are goblet cell carcinoid (GCC) tumours. The majority of GCC present with findings of acute appendicitis or advanced peritoneal spread. We describe a rare presentation of GCC as subtle mucosal abnormality of the appendiceal orifice seen on colonoscopy performed for iron-deficiency anaemia. Biopsies were interpreted as adenocarcinoma; however, final surgical pathology confirmed GCC of the appendix with caecal involvement. The patient recovered well from surgery, anaemia resolved and follow-up did not show metastatic disease...
May 15, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29764306/long-term-complications-of-appendectomy-a-systematic-review
#14
T Rasmussen, S Fonnes, J Rosenberg
BACKGROUND AND AIMS: Appendectomy is a common surgical procedure, but no overview of the long-term consequences exists. Our aim was to systematically review the long-term complications of appendectomy for acute appendicitis. MATERIALS AND METHODS: This systematic review was reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A protocol was registered on PROSPERO (CRD42017064662). The databases PubMed and EMBASE were searched for original reports on appendectomy with n ≥ 500 and follow-up >30 days...
May 1, 2018: Scandinavian Journal of Surgery: SJS
https://www.readbyqxmd.com/read/29764132/high-level-theoretical-characterization-of-the-vinoxy-radical-%C3%A2-ch-2-cho-o-2-reaction
#15
Jared D Weidman, Ryan T Allen, Kevin B Moore, Henry F Schaefer
Numerous processes in atmospheric and combustion chemistry produce the vinoxy radical (• CH2 CHO). To understand the fate of this radical and to provide reliable energies needed for kinetic modeling of such processes, we have examined its reaction with O2 using highly reliable theoretical methods. Utilizing the focal point approach, the energetics of this reaction and subsequent reactions were obtained using coupled-cluster theory with single, double, and perturbative triple excitations [CCSD(T)] extrapolated to the complete basis set limit...
May 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29763827/site-preference-for-luminescent-activator-ions-in-doped-fluoroperovskite-rbznf-3
#16
Sanjay Kumar Saroj, Rajamani Nagarajan
With the dual objective of investigating the site preferences of larger sized activator ions and to append luminescence property to the perovskite structured RbZnF3 , doping of manganese(II), cerium(III), europium(III) and terbium(III) ions (5 mol%) was carried out. Although cubic symmetry of RbZnF3 was preserved for all the doped samples, site preference of rare-earth ions for the A-site Rb+ leading to an inverse perovskite arrangement has been noticed from careful analysis of lattice parameters from refinement of powder X-ray diffraction data...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29763444/cholelithiasis-and-choledocholithiasis-in-children-risk-factors-for-development
#17
Barbora Frybova, Jiri Drabek, Jindra Lochmannova, Ladislav Douda, Stepan Hlava, Daniela Zemkova, Vladimir Mixa, Martin Kyncl, Lubos Zeman, Michal Rygl, Radan Keil
PURPOSE: To compare anthropometric data (body mass index [BMI]) in patients without lithiasis to patients with symptomatic simple cholelithiasis or choledocholithiasis. METHODS: We retrospectively reviewed data from 147 patients undergoing laparoscopic cholecystectomy between 2001-2015. Complete growth data from 98 patients was compared with anthropometric data from the population of the Czech Republic and a control group (BMI of 100 consecutive patients without biliary stones in abdominal ultrasound who were admitted to a surgical department for suspected appendicitis)...
2018: PloS One
https://www.readbyqxmd.com/read/29763297/nitrobenzoxadiazole-appended-cell-membrane-modifiers-for-efficient-optoporation-with-non-coherent-light
#18
Saya Otake, Kou Okuro, Davide Bochicchio, Giovanni M Pavan, Takuzo Aida
FL NBD-BAMPEG2k bearing a nitrobenzoxadiazole (NBD) unit and an oleyl terminus conjugated via a poly(ethylene glycol) (PEG) spacer ( Mn = 2,000), was designed to fluorescently label cell membranes by docking its hydrophobic oleyl terminus. During laser scanning microscopy in a minimal essential medium (MEM), human hepatocellular carcinoma Hep3B cells labelled with FL NBD-BAMPEG2k appeared to undergo optoporation at their plasma membrane. We confirmed this unprecedented possibility by a series of cellular uptake experiments using negatively charged and therefore membrane-impermeable quantum dots (QDs; Dh = 4...
May 15, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29762016/rapid-2-ms-interrogation-of-electrochemical-aptamer-based-sensor-response-using-intermittent-pulse-amperometry
#19
Mirelis Santos-Cancel, Robert Alexander Lazenby, Ryan J White
In this manuscript, we employ the technique intermittent pulse amperometry (IPA) to interrogate equilibrium and kinetic target binding to the surface of electrochemical, aptamer-based (E-AB) sensors, achieving as fast as 2 ms time resolution. E-AB sensors comprise an electrode surface modified with a flexible nucleic acid aptamer tethered at the 3'-terminus with a redox-active molecule. The introduction of a target changes the conformation and flexibility of the nucleic acid which alters the charge transfer rate of the appended redox molecule...
May 15, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29760840/clinical-ultrasound-is-safe-and-highly-specific-for-acute-appendicitis-in-moderate-to-high-pre-test-probability-patients
#20
Daniel Corson-Knowles, Frances M Russell
Introduction: Clinical ultrasound (CUS) is highly specific for the diagnosis of acute appendicitis but is operator-dependent. The goal of this study was to determine if a heterogeneous group of emergency physicians (EP) could diagnose acute appendicitis on CUS in patients with a moderate to high pre-test probability. Methods: This was a prospective, observational study of a convenience sample of adult and pediatric patients with suspected appendicitis. Sonographers received a structured, 20-minute CUS training on appendicitis prior to patient enrollment...
May 2018: Western Journal of Emergency Medicine
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