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https://www.readbyqxmd.com/read/29053923/loss-and-reformation-of-ruthenium-alkylidene-connecting-olefin-metathesis-catalyst-deactivation-regeneration-and-isomerization
#1
Julien Engel, Wietse Smit, Marco Foscato, Giovanni Occhipinti, Karl W Törnroos, Vidar R Jensen
Ruthenium-based olefin metathesis catalysts are used in laboratory-scale organic synthesis across chemistry, largely thanks to their ease of handling and functional group tolerance. In spite of this robustness, these catalysts readily decompose, via little-understood pathways, to species that promote double-bond migration (isomerization) in both the 1-alkene reagents and the internal-alkene products. We have studied, using density functional theory (DFT), the reactivity of the Hoveyda-Grubbs second-generation catalyst 2 with allylbenzene, and discovered a facile new decomposition pathway...
October 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29051401/symptomatic-pile-tailored-procedure-a-new-perspective-for-hemorrhoidal-disease-treatment
#2
Claudio Elbetti, Iacopo Giani, Eugenio Novelli, Jacopo Martellucci, Francesco Feroci
AIM: Aim of the present paper was to evaluate the role of tailored different single pile treatment in the clinical outcome of hemorrhoids. MATERIAL OF STUDY: The surgical strategy considered to treat only pathological piles with different procedure according to each pathological Goligher's degree, presence of fibrous, inelastic redundant internal pile(F) and presence of external pathological pile (external pile congestion or subversion of dental line (E) and skin tag not tolerated from the patient (S))...
2017: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/29049136/comparisons-of-traditional-metabolic-markers-and-compensatory-reserve-as-early-predictors-of-tolerance-to-central-hypovolemia-in-humans
#3
Alicia M Schiller, Jeffrey T Howard, Kristen R Lye, Christian G Magby, Victor A Convertino
Circulatory shock remains a leading cause of death in both military and civilian trauma. Early, accurate and reliable prediction of decompensation is necessary for the most efficient interventions and clinical outcomes. Individual tolerance to reduced central blood volume can serve as a model to assess the sensitivity and specificity of vital sign measurements. The compensatory reserve (CRM) is the measurement of this capacity. Measurements of muscle oxygen saturation (SmO2), blood lactate and end tidal CO2 (EtCO2) have recently gained attention as prognostic tools for early assessment of the status of patients with progressive hemorrhage, but lack the ability to adequately differentiate individual tolerance to hypovolemia...
October 18, 2017: Shock
https://www.readbyqxmd.com/read/29048912/intermolecular-2-2-cycloaddition-of-1-4-dihydropyridines-with-olefins-via-energy-transfer
#4
Chengfeng Wang, Zhan Lu
A highly regio- and diastereoselective visible-light-promoted [2 + 2] cycloaddition between readily available 1,4-dihydropyridines and olefins has been developed. This strategy is operationally simple and atom-economical and enables the construction of strained polysubstituted 2-azabicyclo[4.2.0]octanes with three all-carbon quaternary centers with good functional group tolerance. These products can be easily converted to various structurally unique derivatives. The primary mechanistic studies demonstrated that the reaction proceeds through an energy transfer pathway...
October 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/29046901/chirurgia-e-management-delle-pazienti-anziane-affette-da-carcinoma-ovarico
#5
Paolo Scollo, Giuseppe Scibilia, Basilio Pecorino
The median life expectancy of population among industrialized countries has dramatically expanded in recent years. On the other hand, the risk of developing cancer increases with age.The treatment for gynaecological malignancies is well defined with respect to the surgery, radiation treatment and chemotherapy. However, elderly patients receives substandard treatment when compared to the younger people, generally due to the presence of associated medical conditions. The assessment of the co-morbidity is an important aspect of the surgical decision-making process...
2017: Argom Oncol Geriatr
https://www.readbyqxmd.com/read/29044544/primary-systemic-therapy-in-resectable-pancreatic-ductal-adenocarcinoma-using-mfolfirinox-a-pilot-study
#6
Robert de W Marsh, Mark S Talamonti, Marshall S Baker, Mitchell Posner, Kevin Roggin, Jeffrey Matthews, Daniel Catenacci, Mark Kozloff, Blase Polite, Michele Britto, Chi Wang, Hedy Kindler
BACKGROUND AND OBJECTIVES: Surgery followed by gemcitabine and/or a fluoropyrimidine is standard therapy for resectable PDAC. mFOLFIRINOX (oxaliplatin 85 mg/m(2) , irinotecan 180 mg/m(2) , leucovorin 400 mg/m(2) Day 1, 5-FU 2400 mg/m(2)  × 48 h IV, peg-filgrastim 6 mg SQ day 3, every 14 days) has substantial activity in metastatic PDAC. We wished to determine the tolerability/efficacy of peri-operative mFOLFIRINOX in resectable PDAC. METHODS: Patients with resectable PDAC (ECOG PS 0/1) received four cycles of mFOLFIRINOX pre- and post-surgery...
October 16, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29041745/1-5-%C3%AE-m-polarization-coherent-lidar-incorporating-time-division-multiplexing
#7
Chong Wang, Haiyun Xia, Mingjia Shangguan, Yunbin Wu, Lu Wang, Lijie Zhao, Jiawei Qiu, Renjun Zhang
Atmospheric depolarization ratio and wind velocity are measured simultaneously by a single versatile coherent Doppler lidar (CDL). Backscattering components at parallel and perpendicular polarization states are obtained by using a single balanced detector, adopting time-division multiplexing technique. Thus systematic error induced by the non-uniform response of different detectors in traditional lidars is avoided. The operation mode of the instrument can be switched from polarization CDL to traditional CDL by the user depending on atmospheric conditions and desired performance...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29041306/mixed-basis-quantum-key-distribution-with-linear-optics
#8
Mladen Pavičić, Oliver Benson, Andreas W Schell, Janik Wolters
Two-qubit quantum codes have been suggested to obtain better efficiency and higher loss tolerance in quantum key distribution. Here, we propose a two-qubit quantum key distribution protocol based on a mixed basis consisting of two Bell states and two states from the computational basis. All states can be generated from a single entangled photon pair resource by using local operations on only one auxiliary photon. Compared to other schemes it is also possible to deterministically discriminate all states using linear optics...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29041279/bit-based-support-vector-machine-nonlinear-detector-for-millimeter-wave-radio-over-fiber-mobile-fronthaul-systems
#9
Yue Cui, Min Zhang, Danshi Wang, Siming Liu, Ze Li, Gee-Kung Chang
An effective bit-based support vector machine (SVM) is proposed as a non-parameter nonlinear mitigation approach in the millimeter-wave radio-over-fiber (RoF) mobile fronthaul (MFH) system for various modulation formats. First, we analyze the impairments originated from nonlinearities in the millimeter-wave RoF system. Then we introduce the operation principle of the bit-based SVM detector. As a classifier, the SVM can create nonlinear decision boundaries by kernel function to mitigate the distortions caused by both linear and nonlinear noise...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29041233/circular-core-single-mode-polymer-waveguide-for-high-density-and-high-speed-optical-interconnects-application-at-1550-nm
#10
Xiao Xu, Lin Ma, Shoulin Jiang, Zuyuan He
We demonstrate circular-core 1550 nm single-mode polymer waveguides with a graded-index profile fabricated by commercially available UV-curable epoxies using so-called mosquito method. The relative index difference ∆n of the waveguides was designed to be 0.46% in order to guarantee both single-mode operation and good compatibility with standard single-mode fiber. Accurate refractive index tuning of monomer for core construction was realized by mixing the core and cladding epoxies properly. The core pitch of the waveguides was chosen to be 50 μm to satisfy the requirements for high-density on-board optical interconnects...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29040863/high-tolerance-of-and-removal-of-cefazolin-sodium-in-single-chamber-microbial-fuel-cells-operation
#11
Enren Zhang, Qingling Yu, Wenjing Zhai, Feng Wang, Keith Scott
Single-chamber microbial fuel cells (MFCs) have been shown to be a promising approach for cefazolin sodium (CFZS)-contaminated wastewater treatment, in terms of electricity production, high CFZS tolerance and effective CFZS removal. MFCs exposed to CFZS loadings up to 100 mg L(-1), produced stable power of 18.2 ± 1.1 W m(-3) and a maximum power of 30.4 ± 2.1 W m(-3), similar to that of CFZS-free MFCs (stable power 19.4 ± 0.8 W m(-3) and maximum power 32.5 ± 1.6 W m(-3)), notwithstanding a longer acclimitisation MFC activation...
October 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29039355/highly-stable-cesium-lead-iodide-perovskite-quantum-dot-light-emitting-diodes
#12
Chen Zou, Chun-Ying Huang, Erin M Sanehira, Joseph M Luther, Lih Y Lin
Recently, all-inorganic perovskites such as CsPbBr3 and CsPbI3, have emerged as promising materials for light-emitting applications. While encouraging performance has been demonstrated, the stability issue of the red-emitting CsPbI3 is still a major concern due to its small tolerance factor. Here we report a highly stable CsPbI3 quantum dot (QD) light-emitting diode (LED) with red emission fabricated using an improved purification approach. The device achieved decent external quantum efficiency (EQE) of 0.21% at a bias of 6 V and outstanding operational stability, with a L 70 lifetime (EL intensity decreases to 70% of starting value) of 16 h and 1...
October 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29037634/pilot-study-post-operative-rehabilitation-pathway-changes-and-implementation-of-functional-closed-kinetic-chain-exercise-in-total-hip-and-total-knee-replacement-patient
#13
C Abbas, J Daher
OBJECTIVE: The aim of this study was to assess the feasibility of introducing a functional closed kinetic chain exercise program to an acute care setting to reduce length of hospital stay and assess tolerance to exercise immediately following total hip or total knee arthroplasty. METHODS: A protocol change implementing a functional closed kinetic chain based exercise program, post total hip (n = 535) and total knee (n = 695) arthroplasty, was performed at Windsor Regional Hospital Ouellette Campus in Windsor, Ontario Canada...
October 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29037481/surgical-outcomes-among-elderly-women-with-endometrial-cancer-treated-by-laparoscopic-hysterectomy-a-nrg-gynecologic-oncology-group-study
#14
Erin A Bishop, James J Java, Kathleen N Moore, Nick M Spirtos, Michael L Pearl, Oliver Zivanovic, David M Kushner, Floor Backes, Chad A Hamilton, Melissa A Geller, Jean Hurteau, Cara Mathews, Robert M Wenham, Pedro T Ramirez, Susan Zweizig, Joan L Walker
OBJECTIVE: Tolerance of and complications due to minimally invasive hysterectomy and staging in the older endometrial cancer population is largely unknown despite the fact that this is the most rapidly growing age group in the United States. The objective of this retrospective review is to compare operative morbidity by age in patients on the Gynecologic Oncology Group (GOG) LAP2 trial. METHODS: This is a retrospective analysis of patients from GOG LAP2, a trial that included clinically early stage uterine cancer patients randomized to laparotomy vs...
October 13, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29037469/management-of-patients-with-adenocarcinoma-or-squamous-cancer-of-the-esophagus
#15
David H Ilson, Richard Hillegersberg
Esophageal cancer is characterized by the early and frequent metastasis. Surgery is the primary treatment for early-stage disease, whereas patients with patients with locally advanced disease receive peri-operative chemotherapy or chemoradiotherapy. Squamous cancers can be treated with primary chemoradiotherapy without surgery, depending on their response to therapy and patient tolerance for subsequent surgery. Chemotherapy with a fluorinated pyrimidine and a platinum agent, followed by later treatment with taxanes and irinotecan, provides some benefit...
October 13, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29034519/flexible-aqueous-li-ion-battery-with-high-energy-and-power-densities
#16
Chongyin Yang, Xiao Ji, Xiulin Fan, Tao Gao, Liumin Suo, Fei Wang, Wei Sun, Ji Chen, Long Chen, Fudong Han, Ling Miao, Kang Xu, Konstantinos Gerasopoulos, Chunsheng Wang
A flexible and wearable aqueous symmetrical lithium-ion battery is developed using a single LiVPO4 F material as both cathode and anode in a "water-in-salt" gel polymer electrolyte. The symmetric lithium-ion chemistry exhibits high energy and power density and long cycle life, due to the formation of a robust solid electrolyte interphase consisting of Li2 CO3 -LiF, which enables fast Li-ion transport. Energy densities of 141 Wh kg(-1) , power densities of 20 600 W kg(-1) , and output voltage of 2.4 V can be delivered during >4000 cycles, which is far superior to reported aqueous energy storage devices at the same power level...
October 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29034347/using-a-weaning-immunosuppression-protocol-in-liver-transplantation-recipients-with-hepatocellular-carcinoma-a-compromise-between-the-risk-of-recurrence-and-the-risk-of-rejection
#17
REVIEW
Roberta Angelico, Alessandro Parente, Tommaso Maria Manzia
Hepatocellular carcinoma (HCC) recurrence rate after liver transplantation (LT) is still up to 15-20%, despite a careful selection of candidates and optimization of the management within the waiting list. To reduce tumour recurrence, the currently adopted post-transplant strategies are based on the administration of a tailored immunosuppression (IS) regimen. Drug-induced depression of the immune system is essential in preventing graft rejection, however has a well-established association with oncogenesis. The immune system has a key role as a defending mechanism against cancer development, preventing vascular invasion and metastasis...
2017: Translational Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29031270/robust-determination-of-the-chemical-potential-in-the-pole-expansion-and-selected-inversion-method-for-solving-kohn-sham-density-functional-theory
#18
Weile Jia, Lin Lin
Fermi operator expansion (FOE) methods are powerful alternatives to diagonalization type methods for solving Kohn-Sham density functional theory (KSDFT). One example is the pole expansion and selected inversion (PEXSI) method, which approximates the Fermi operator by rational matrix functions and reduces the computational complexity to at most quadratic scaling for solving KSDFT. Unlike diagonalization type methods, the chemical potential often cannot be directly read off from the result of a single step of evaluation of the Fermi operator...
October 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29028737/resting-pd-pa-and-haemodynamic-relevance-of-coronary-stenosis-as-evaluated-by-fractional-flow-reserve
#19
Giuseppe De Luca, Monica Verdoia, Lucia Barbieri, Paolo Marino, Harry Suryapranata
BACKGROUND: Fractional flow reserve (FFR) currently represents the gold standard in the evaluation of the haemodynamic relevance of coronary stenoses. However, both intracoronary and intravenous adenosine may be tolerated poorly by some patients. Therefore, considerable interest had been focused in the last few years on new adenosine-free indexes to define the haemodynamic relevance of coronary stenoses. So far, few data have been reported on resting Pd/Pa and its correlation with FFR as evaluated with high-dose intracoronary adenosine administration, which is the aim of the current study...
October 12, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/29026917/-fractures-of-the-lower-extremities-in-childhood-part-2-lower-leg-and-ankle-fractures
#20
M Voth, L Kremer, I Marzi
The treatment of pediatric patients in trauma surgery is a special situation in every aspect. For deciding on the correct treatment of fractures of the lower leg and ankle joint, various parameters, such as residual growth rate, skeletal age and height of the patient are decisive. The differences between fractures in children and adolescents are the open epiphyseal plate and the resulting residual growth. The bones of young children have a higher healing tendency and a greater potential for correction than in adolescents...
October 12, 2017: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
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