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https://www.readbyqxmd.com/read/28742965/sequential-tandem-addition-reactions-to-a-tungsten-trifluorotoluene-complex-a-versatile-method-for-the-preparation-of-highly-functionalized-trifluoromethylated-cyclohexenes
#1
Katy B Wilson, Jeffery T Myers, Hannah S Nedzbala, Logan A Combee, Michal Sabat, W Dean Harman
The effects of an electron-withdrawing group on the organic chemistry of an η2-bound benzene ring are explored using the complex TpW(NO)(PMe3)(η2-PhCF3). This trifluorotoluene complex was found to undergo a highly regio- and stereoselective 1,2-addition reaction involving protonation of an ortho carbon followed by addition of a carbon nucleophile. The resulting 1,3-diene complexes can undergo a second protonation and nucleophilic addition with a range of nucleophiles including hydrides, amines, cyanide, and protected enolates...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28742960/tuning-the-redox-properties-of-fullerene-clusters-within-a-metal-organic-capsule
#2
Felix J Rizzuto, Daniel M Wood, Tanya K Ronson, Jonathan R Nitschke
A porphyrin-edged metal-organic tetrahedron was shown to form host-guest complexes containing 1-4 equivalents of fullerene C60, depending on the solvent employed. The molecules of C60 were bound in anti-cooperative fashion within well-defined pockets; an X ray crystal structure of three fullerenes inside the tetrahedron was obtained. Electrochemical measurements revealed that the electron-accepting properties of the fullerenes inside the capsules were altered depending on the mode of encapsulation. Encapsulation of a greater number of fullerenes was observed to increase the electron affinity of the overall cluster...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28742944/ni-catalyzed-enantioselective-conjunctive-cross-coupling-of-9-bbn-borates
#3
James Patrick Morken, Matteo Chierchia, Chunyin Law
Catalytic enantioselective conjunctive cross-coupling be-tween 9-BBN boronate complexes and aryl electrophiles can be accomplished with Ni salts in the presence of a chiral diamine ligand. The reactions furnish chiral 9-BBN derivatives in an enantioselective fashion and these are converted to chiral alcohols and amines, or engaged in other stereospecific C-C bond forming reactions.
July 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28742346/molecular-dynamics-of-double-stranded-xylo-nucleic-acid-xylona
#4
Amutha Ramaswamy, Daryna Smyrnova, Mattheus Froeyen, Mohitosh Maiti, Piet Herdewijn, Arnout Ceulemans
Xylo-nucleic acid (XyloNA) is a synthetic analogue of ribo-nucleic acid (RNA), where the ribose sugar has been replaced by xylose. We present a Molecular Dynamics study of the conformational evolution of XyloNA double strand oligomers derived from A-RNA through the substitution of beta-ᴅ-ribofuranose by beta-ᴅ-xylofuranose and having lengths of 8, 16 and 29 base pairs, using a set of independent all-atom simulations performed at various time scales ranging from 55 to 100 ns, , with one long 500 ns simulation of the 29-mer...
July 25, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28742240/role-of-tissue-eosinophils-in-chronic-rhinosinusitis-associated-olfactory-loss
#5
Leah J Hauser, Rakesh K Chandra, Ping Li, Justin H Turner
BACKGROUND: Olfactory dysfunction is 1 of the hallmark symptoms of chronic rhinosinusitis (CRS). Eosinophilic inflammation has been implicated as a potential causative factor. However, prior studies have been limited by retrospective study designs, concomitant use of systemic corticosteroids, and other confounding factors. METHODS: CRS and healthy non-CRS control subjects undergoing endoscopic sinus or skull-base surgery were prospectively enrolled and completed olfactory testing utilizing the 40-item Smell Identification Test (SIT) immediately prior to surgery...
July 25, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28742134/hemostasis-pad-combined-with-compression-device-after-transradial-coronary-procedures-a-randomized-controlled-trial
#6
Si-Hyuck Kang, Donghoon Han, Sehun Kim, Chang-Hwan Yoon, Jin-Joo Park, Jung-Won Suh, Young-Seok Cho, Tae-Jin Youn, In-Ho Chae
BACKGROUND: Arterial access and hemostasis are important processes during percutaneous coronary procedures. In this study, we tested if the use of chitosan-based pads on top of compression devices could improve hemostasis efficacy compared with compression devices alone after transradial coronary angiography or interventions. METHODS: This study was a single-center open-label randomized controlled trial. Patients who underwent coronary angiography or intervention with the transradial approach were randomly assigned to the study (compression device and a chitosan-based pad) or control (compression devices alone) group in a 2:1 fashion...
2017: PloS One
https://www.readbyqxmd.com/read/28742107/analyzing-the-locomotory-gaitprint-of-caenorhabditis-elegans-on-the-basis-of-empirical-mode-decomposition
#7
Li-Chun Lin, Han-Sheng Chuang
The locomotory gait analysis of the microswimmer, Caenorhabditis elegans, is a commonly adopted approach for strain recognition and examination of phenotypic defects. Gait is also a visible behavioral expression of worms under external stimuli. This study developed an adaptive data analysis method based on empirical mode decomposition (EMD) to reveal the biological cues behind intricate motion. The method was used to classify the strains of worms according to their gaitprints (i.e., phenotypic traits of locomotion)...
2017: PloS One
https://www.readbyqxmd.com/read/28741934/mixed-spin-diamond-chain-cu2fepo4f4-h2o-4-with-a-noncollinear-spin-order-and-possible-successive-phase-transitions
#8
Hongcheng Lu, Naoaki Hayashi, Yuki Matsumoto, Hiroshi Takatsu, Hiroshi Kageyama
A diamond spin chain system, one of the one-dimensional frustrated lattices, is known to exhibit novel properties, but experimental studies have been exclusively confined to materials with a single spin component. Here, we report on the synthesis, structure, and magnetic properties of a new diamond chain compound Cu2FePO4F4(H2O)4 1 composed of mixed-spins of Cu(2+) (S = 1/2 × 2) and Fe(3+) (S = 5/2). Compound 1 crystallizes in the space group C2/c of the monoclinic crystal system with a = 7.7546(4) Å, b = 12...
July 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28741859/inpatient-palliative-care-referral-and-9-month-hospital-readmission-in-patients-with-congestive-heart-failure-a-linked-nationwide-analysis
#9
Katie Wiskar, Leo Anthony Celi, Keith R Walley, Clark Fruhstorpher, Barret Rush
OBJECTIVE: End-stage heart failure (HF) is characterized by high symptom burden and frequent hospitalization. Palliative Care (PC) is recommended for advanced HF, and there is some evidence in other diseases that this may reduce readmission rates. We attempted examine the association of an inpatient PC visit on hospital readmission for patients admitted with HF. METHODS: Retrospective linked nationwide analysis from 2013 with 9-month follow-up for all hospital readmissions for patients admitted with HF exacerbations using the Nationwide Readmission Database (NRD)...
July 25, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28741403/comparative-study-between-the-caloric-vestibular-and-the-video-head-impulse-tests-in-unilateral-meni%C3%A3-re-s-disease
#10
Jonathan Andrés Cordero-Yanza, Edna Verónica Arrieta Vázquez, Juan Carlos Hernaiz Leonardo, Jimena Mancera Sánchez, Mario Sabas Hernández Palestina, Nicolás Pérez-Fernández
OBJECTIVE: Compare the caloric vestibular test (CVT) and the video head impulse test (vHIT) in the evaluation of Meniere's disease (MD) and to analyze their diagnostic accuracy. MATERIALS AND METHODS: Retrospective review of CVT and vHIT performed in MD patients at a tertiary care referral center in Spain. RESULTS: A total of 88 patients were reviewed. The CVT was abnormal in 67% (n = 59) of patients, while the vHIT was abnormal in 66% (n = 58) of them...
July 25, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28741225/conversion-of-external-ventricular-drainage-to-ventriculo-peritoneal-shunt-to-change-or-not-to-change-the-proximal-catheter
#11
Jehuda Soleman, Haggai Benvenisti, Shlomi Constantini, Jonathan Roth
PURPOSE: In this study, we investigate the occurrence rate of early shunt infection and malfunction in pediatric patients after converting an external ventricular drainage (EVD) to a ventriculo-peritoneal shunt (VPS) without replacing the ventricular catheter. METHODS: Data was retrospectively reviewed for 17 pediatric patients (11 male (64.7%), mean age 7.5 years, range 0.25-15 years) who underwent 18 consecutive direct conversions of tunneled EVD to VPS without replacing the ventricular catheter between 2008 and 2017...
July 24, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28741000/singapore-defibrillation-guidelines-2016
#12
Chun Yue Francis Lee, Venkataraman Anantharaman, Swee Han Lim, Yih Yng Ng, Tek Siong Chee, Chong Meng Seet, Marcus Eng Hock Ong
The most common initial rhythm in a sudden cardiac arrest is ventricular fibrillation or pulseless ventricular tachycardia. This is potentially treatable with defibrillation, especially if provided early. However, any delay in defibrillation will result in a decline in survival. Defibrillation requires coordination with the cardiopulmonary resuscitation component for effective resuscitation. These two components, which form the key links in the chain of survival, have to be brought to the cardiac victim in a timely fashion...
July 2017: Singapore Medical Journal
https://www.readbyqxmd.com/read/28739736/puerarin-induces-hepatocellular-carcinoma-cell-apoptosis-modulated-by-mapk-signaling-pathways-in-a-dose-dependent-manner
#13
Wei-Guo Zhang, Xiu-Cai Yin, Xiao-Fang Liu, Ke-Wei Meng, Kun Tang, Fei-Long Huang, Gang Xu, Jie Gao
BACKGROUND/AIM: Puerarin possesses a battery of therapeutic values in diverse disorders, including pro-apoptotic actions in multiple cancers. Herein, we investigated the effects of puerarin on hepatocellular carcinoma (HCC) in vitro. MATERIALS AND METHODS: MTT and flow cytometry were carried out to evaluate the viability and apoptosis of SMMC-7721 HCC cells in the presence of different concentrations of puerarin. Moreover, expression levels, as well as phosphorylation status of several canonical components in mitogen-activated protein kinase (MAPK) pathways, including extracellular signal-regulated kinase 1/2 (ERK1/2), c- Jun N-terminal kinase (JNK), p38, were measured by reverse transcription and quantitative real-time polymerase chain reaction (RT-PCR) and western blot analysis at indicated time intervals...
August 2017: Anticancer Research
https://www.readbyqxmd.com/read/28739473/a-defined-protocol-to-resolving-cannulation-failure-during-endovenous-ablation-procedures
#14
Scarlett Hao, Samantha Cox, Thomas S Monahan, Tanya Flohr, Rajabrata Sarkar
During endovenous ablation for the treatment of insufficient veins, failure to cannulate the entirety of the refluxing vein with the treatment catheter prevents technically successful ablation. In this technique report, we describe a defined protocol to overcome cannulation failure of axial veins for endovenous ablation. This protocol utilizes commonly available adjunctive techniques including ultrasound-guided digital compression, the use of a guide wire, the use of a guide catheter, and placement of a second puncture site in a step-wise fashion to overcome varying degrees of tortuosity or obstruction...
July 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28739458/effects-of-chemotherapy-in-patients-with-concomitant-aortic-aneurysm-and-malignant-disease
#15
Marco Leopardi, Evelina Di Marco, Aldo Musilli, Enrico Ricevuto, Gemma Bruera, Marco Ventura
BACKGROUND: The aim of the study is to present the results in a consecutive series of patients affected by aortic abdominal aneurysm and to underline the aneurysmal growth and evolution in oncological patients submitted to dedicated oncological medical therapy. METHODS: Between January 2010 and June 2016 we treated in our center 19 patients for coexisting aortic aneurysms (>3cm) and malignancy. We observed patients undergoing oncological treatment and patients who did not undergo medical treatment...
July 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28738827/bacterial-tail-anchors-can-target-to-the-mitochondrial-outer-membrane
#16
Güleycan Lutfullahoğlu-Bal, Abdurrahman Keskin, Ayşe Bengisu Seferoğlu, Cory D Dunn
BACKGROUND: During the generation and evolution of the eukaryotic cell, a proteobacterial endosymbiont was re-fashioned into the mitochondrion, an organelle that appears to have been present in the ancestor of all present-day eukaryotes. Mitochondria harbor proteomes derived from coding information located both inside and outside the organelle, and the rate-limiting step toward the formation of eukaryotic cells may have been development of an import apparatus allowing protein entry to mitochondria...
July 24, 2017: Biology Direct
https://www.readbyqxmd.com/read/28738407/pain-and-learning-in-primary-school-a-population-based-study
#17
Silja Kosola, Lisa K Mundy, Susan M Sawyer, Louise Canterford, Danielle A van der Windt, Kate M Dunn, George C Patton
Despite the frequency of pain among children, little is known about its effects on learning and school outcomes. The objective of this study was to quantify the association of pain and academic achievement while taking into account the presence of co-occurring emotional symptoms. A population-based stratified random sample of 1239 students aged 8 to 9 years from primary schools in Melbourne, Australia, was recruited for the Childhood to Adolescence Transition Study. Children indicated sites of pain that had lasted for a day or longer in the past month using a pain manikin...
June 21, 2017: Pain
https://www.readbyqxmd.com/read/28737800/c-h-addition-reactivity-of-2-phenylpyridine-and-2-2-bipyridine-with-pentaphenylborole
#18
Venkata A K Adiraju, Caleb D Martin
The reactions of pentaphenylborole with pyridines with a pendent aryl group in the 2-position, specifically 2-phenylpyridine and 2,2'-bipyridine, readily afforded adducts. Upon thermolysis, the adducts converted to ortho C-H addition products with the two substituents introduced onto the diene on the boracyclic carbon atoms adjacent to boron in a syn fashion. Photolysis of the syn 2-phenypyridine product led to isomerization to the anti conformer which did not readily occur for the 2,2'-bipyridine complex. Such C-H bond reactivity is uncommon for main group elements and provides insight into methodologies to access boron frameworks...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28736995/controlled-exposure-of-bioactive-growth-factor-in-3d-amyloid-hydrogel-for-stem-cells-differentiation
#19
Subhadeep Das, Rakesh Kumar, Narendra Nath Jha, Samir K Maji
Amyloid based hydrogels can mimic the extracellular matrix and serve as matrices for tissue engineering both in vitro and in vivo. A pH responsive self-assembled amyloid hydrogel system is used to encapsulate various growth factors for driving stem cell differentiation toward neuronal lineage. Diffusion studies with fluorescence recovery after photobleaching and bulk release with the model protein fluorescein isothiocyanate-bovine serum albumin show that encapsulated protein molecules can be released in a sustained fashion from the hydrogel over a considerable period of time (30 d)...
July 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28736945/tim-1-b-cells-suppress-t-cell-interferon-gamma-production-and-promote-foxp3-expression-but-have-impaired-regulatory-function-in-coronary-artery-disease
#20
Xiao-Long Gu, Huan He, Lin Lin, Guo-Xin Luo, Yan-Fei Wen, Ding-Cheng Xiang, Jian Qiu
Atherosclerosis and its associated coronary artery disease (CAD) represent another chronic low-grade inflammatory disorder. Regulatory B cells (Bregs) possess essential functions in maintaining peripheral tolerance and inhibiting pathogenic inflammation through IL-10. Here, we investigated one subset of Bregs, Tim-1(+) B cell, and its role in atherosclerosis and CAD patients. In healthy individuals, IL-10-producing B cells were predominantly found in the Tim-1(+) B cells. Upon stimulation of the B cell receptor (BCR) and Toll-like receptor 9 (TLR-9) by anti-BCR antibodies and CpG, respectively, the Tim-1(+) B cells could further upregulate IL-10 expression...
July 24, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
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