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https://www.readbyqxmd.com/read/28737389/glycosyl-cations-versus-allylic-cations-in-spontaneous-and-enzymatic-hydrolysis
#1
Phillip M Danby, Stephen G Withers
Enzymatic prenyl and glycosyl transfer are seemingly unrelated reactions that yield molecules and protein modifications with disparate biological functions. However, both reactions employ diphosphate-activated donors and each proceed via cationic spe-cies: allylic cations and oxocarbenium ions, respectively. In this study, we explore the relationship between these processes by preparing valienyl ethers to serve as glycoside mimics that are capable of allylic rather than oxocarbenium cation stabilization. Rate constants for spontaneous hydrolysis of aryl glycosides and their analogous valienyl ethers were found to be almost identical, as were the corresponding activation enthalpies and entropies...
July 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28736108/chronic-intermittent-ethanol-exposure-selectively-alters-the-expression-of-g%C3%AE-subunit-isoforms-and-rgs-subtypes-in-rat-prefrontal-cortex
#2
D Jluessen, H Sun, M M McGinnis, B A McCool, R Chen
Chronic alcohol exposure induces pronounced changes in GPCR-mediated G-protein signaling. Recent microarray and RNA-seq analyses suggest associations between alcohol abuse and the expression of genes involved in G-protein signaling. The activity of G-proteins (e.g. Gαi/o and Gαq) is negatively modulated by regulator of G-protein signaling (RGS) proteins which are implicated in drugs of abuse including alcohol. The present study used 7 days of chronic intermittent ethanol exposure followed by 24 hour withdrawal (CIE) to investigate changes in mRNA and protein levels of G-protein subunit isoforms and RGS protein subtypes in rat prefrontal cortex, a region associated with cognitive deficit attributed to excessive alcohol drinking...
July 20, 2017: Brain Research
https://www.readbyqxmd.com/read/28735733/incidence-predictors-and-outcomes-associated-with-pneumothorax-during-cardiac-electronic-device-implantation-a-16-year-review-in-over-3-7-million-patients
#3
Gbolahan O Ogunbayo, Richard Charnigo, Yousef Darrat, Gustavo Morales, John Kotter, Odunayo Olorunfemi, Ayman Elbadawi, Vincent L Sorrell, Susan S Smyth, Claude S Elayi
BACKGROUND: Pneumothorax (PTX) is a potential complication of vascular access during cardiac implantable electronic device (CIED) procedure and is under scrutiny as considered a healthcare-acquired condition. OBJECTIVE: Determine the trends in PTX incidence in the United Stated over a 16-year period and whether PTX is associated with increased mortality after adjustment for other factors. METHODS: Using weighted sampling in the largest inpatient health database in the US (National Inpatient Sample), we evaluated data from patients with a primary procedure of CIED implant from 1998 to 2013 who had at least one new vascular access (new or upgrade of prior CIED)...
July 20, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28731681/the-first-n-borylated-emitters-displaying-highly-efficient-thermally-activated-delayed-fluorescence-and-high-performance-oleds
#4
Yi-Jyun Lien, Tzu-Chieh Lin, Chun-Chieh Yang, Yu-Cheng Chiang, Chih-Hao Chang, Shih-Hung Liu, Yi-Ting Chen, Gene-Hsiang Lee, Pi-Tai Chou, Chin-Wei Lu, Yun Chi
Despite the fast boom of thermally activated delayed fluorescence (TADF) emitters bearing borane-based acceptor, so far, none of TADF emitters with a direct B-N linkage between N-donor and boryl acceptor has been reported. The latter should simplify molecular architecture and hence facilitate the synthetic design and versatility. We report here the preparation and characterization of a new series of N-borylated compounds with functional acridine donor unit; namely: ACBM, PACBM and SACBM. Spectroscopic studies were performed to explore their photophysical properties that exhibited prominent solvatochromism and thermally activated delayed fluorescence...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729784/discoloration-of-different-esthetic-restorative-materials-a-spectrophotometric-evaluation
#5
Matteo Ceci, Matteo Viola, Davide Rattalino, Riccardo Beltrami, Marco Colombo, Claudio Poggio
OBJECTIVE: A crucial property of esthetic restorative materials is their long-term color stability. The aim of this in vitro study was to evaluate the color stability of esthetic restorative materials (one microfilled flowable composite, one nanofilled composite, one nanoybrid composite, one microfilled composite, and one nanoybrid ormocer-based composite) after surface roughening with cola and exposure to different staining solutions (coffee and red wine). MATERIALS AND METHODS: All materials were polymerized into silicone rubber rings (2 mm × 6 mm × 8 mm) to obtain 150 specimens identical in size...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28727037/assessment-of-objective-measures-of-beef-steak-juiciness-and-their-relationships-to-sensory-panel-juiciness-ratings
#6
L W Lucherk, T G O'Quinn, J F Legako, R J Rathmann, J C Brooks, M F Miller
The objective of this study was to evaluate multiple instrumental measures of beef juiciness and determine their relationships with sensory panel juiciness ratings. Treatments were selected to maximize variation in juiciness and included 5 USDA quality grades (Prime, upper two-thirds Choice, lower one-third Choice, Select, and Standard) as well as 2 enhanced Select treatments (112 and 107% of the initial raw weight) and were prepared to 3 degrees of doneness (DOD; rare [66°C], medium [71°C], and well done [77°C])...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28718277/clinical-implications-of-long-term-ecg-monitoring-from-loop-recorder-to-devices-remote-control
#7
Andrea DI Cori, Raffaele DE Lucia
Long term ECG monitoring has become nowadays an indispensable technology for prevention, management and treatment of many cardiac issues. Today long term ECG monitoring is achievable through loop recorders (LR) and cardiac devices (CIED) like pacemaker (PM), implantable cardioverter-defibrillators (ICDs) and cardiac resynchronization therapy device-defibrillators (CRT- Ds), all of which associated with remote monitoring (RM). Targeted long term ECG monitoring Patients who have recurrent non documented episodes of palpitations, unexplained episodes of syncope, cryptogenic stroke or patients with a cardiomiopathy needing a risk stratification, may benefit from long term ECG monitoring...
July 18, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28716703/bridge-to-surgery-best-practice-protocol-derived-from-early-clinical-experience-with-the-bridge-occlusion-balloon
#8
Bruce L Wilkoff, Charles Kennergren, Charles J Love, Steven P Kutalek, Laurence M Epstein, Roger Carrillo
A league of physicians at the Eleventh Annual Lead Management Symposium in Miami, Florida developed an expert opinion and federated agreement on a best practice protocol for Bridge™ Occlusion Balloon (Bridge) deployment for patients undergoing transvenous cardiac implantable electronic devices (CIED) lead extraction based on early clinical experience with the balloon. Injury to the superior vena cava (SVC) is a rare, but a serious complication of transvenous lead extraction. Bridge is designed to provide temporary endovascular occlusion of the SVC...
July 14, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28710929/tunable-emission-of-cu-mn-doped-znins-quantum-dots-via-dopant-interaction
#9
Jiatao Zhu, Shiliang Mei, Wu Yang, Guilin Zhang, Qiuhang Chen, Wanlu Zhang, Ruiqian Guo
In this work, transition metal ion- doped zinc-based quantum dots (QDs) are synthesized via a greener controllable method to avoid the toxicity of the traditional cadmium-based QDs and broaden the tunable emission. Herein, the tunable emission of Cu-doped ZnInS/ZnS core-shell QDs (Cu:ZnInS/ZnS) can cover from 500 to 620nm by varying the Cu dopant concentration from 1 to 20% and the maximum quantum yield can reach 49.8%. Based on the single-doped QDs, Cu,Mn co-doped ZnInS/ZnS core-shell QDs (Cu,Mn:ZnInS/ZnS) with a photoluminance (PL) quantum yield of 30...
June 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28705690/color-weight-photometry
#10
Jan Koenderink, Andrea van Doorn, Karl Gegenfurtner
We study the "color weight" for a number of rather different paradigms. In well researched heterochromatic photometry methods we find that the "weights" determined by settings of naive observers are closely determined by the CIE luminance functional. This is very different for tasks that involve mid- and high-level aspects of perception. In several cases we find equipollence for the display red, green and blue channels. Moreover, in such cases the very nonlinear maximum-rule fits the data rather better than a linear functional...
July 19, 2017: Vision Research
https://www.readbyqxmd.com/read/28704205/multi-angle-zno-nanorods-on-plasmonic-ag-nanorods-array-as-an-efficient-near-uv-blue-light-emitter
#11
Anil Kumal Pal, D Bharathi Mohan
Metal enhanced ultraviolet light emission has been explored in ZnO/Ag hybrid structure prepared by hydrothermal growth of multi-angled ZnO nanorods on slanted Ag nanorods array fabricated by thermal evaporation technique. Slanted Ag nanorods are realised to be the stacking of non-spherical Ag nanoparticles resulting asymmetric surface plasmon resonance spectra. The surface roughness of Ag nanorods array film significantly influences the growth mechanism of ZnO nanorods leading to the formation of multi-angled ZnO microflowers...
July 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28698532/a-smartphone-based-automatic-measurement-method-for-colorimetric-ph-detection-using-a-color-adaptation-algorithm
#12
Sung Deuk Kim, Youngmi Koo, Yeoheung Yun
This paper proposes a smartphone-based colorimetric pH detection method using a color adaptation algorithm for point-of-care applications. Although a smartphone camera can be utilized to measure the color information of colorimetric sensors, ambient light changes and unknown built-in automatic image correction operations make it difficult to obtain stable color information. This paper utilizes a 3D printed mini light box and performs a calibration procedure with a paper-printed comparison chart and a reference image which overcomes the drawbacks of smartphone cameras and the difficulty in preparing for the calibration procedure...
July 10, 2017: Sensors
https://www.readbyqxmd.com/read/28697496/spatially-resolved-spectral-sensitivities-as-a-potential-read-out-parameter-in-clinical-gene-therapeutic-trials
#13
Birgit Lorenz, Erika Wegscheider, Christian Hamel, Markus N Preising, Knut Stieger
PURPOSE: Spatially resolved functional assessment of rods and cones under photopic and scotopic conditions is desirable to evaluate the treatment outcome of gene therapeutic applications in inherited retinal disorders, such as early- onset severe retinal dystrophy (EOSRD) or achromatopsia. METHODS: A sample of 3 healthy subjects, 6 patients with RPE65 deficiency (aged 11-45 years), and 3 patients with cone dysfunction disorders underwent spectral sensitivity testing (SST) under conditions of dark and light adaptation using a Humphrey Field Analyzer modified perimeter...
July 12, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/28696088/cardiac-lead-management-the-future-of-transvenous-lead-extraction-approaches-and-technologies
#14
Luca Segreti, Jean-Claude Deharo
INTRODUCTION: The implantation rate of Cardiac implantable Elecrtonical Devices has consistently increased in the last 20 years, so as related complication rates. According, devices infections and malfunctions required the development of appropriate strategies, including lead removal. Transvenous lead extraction (TLE) is the gold standard for lead removal. The increasing rate of CIED implantations and of CIED related complications highlight the importance of transvenous lead extraction (TLE)...
July 10, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28694202/comparative-outcomes-of-cefazolin-versus-nafcillin-for-methicillin-susceptible-staphylococcus-aureus-bacteremia-a-prospective-multi-center-cohort-study-in-korea
#15
Shinwon Lee, Kyoung-Ho Song, Sook-In Jung, Wan Beom Park, Sun Hee Lee, Yeon-Sook Kim, Yee Gyung Kwak, Young Keun Kim, Sung Min Kiem, Hye-In Kim, Eu Suk Kim, Kyung-Hwa Park, Nam Joong Kim, Hee-Chang Jang, Hong Bin Kim
OBJECTIVES: No randomized controlled trials have evaluated the comparative outcomes of cefazolin versus nafcillin for methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. METHODS: A prospective observational cohort study including all S. aureus bacteremia was conducted at 10 hospitals. Patients (≥15 years) with MSSA bacteremia who received cefazolin or nafcillin as definitive antibiotics were included. The rates of treatment failure (premature discontinuation of antibiotics due to adverse effects, switching of antibiotics due to clinical failure, all-cause mortality within one month, or recurrence) were compared between the cefazolin and nafcillin groups...
July 7, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28693702/the-hidea-school-based-screening-scale-for-teachers-to-detect-adhd-markers-in-elementary-students
#16
Javier Fenollar-Cortés, Joaquín Parra-Martínez, Encarnación Hernández-Pérez, José-Antonio Rabadán-Rubio
BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) is associated with academic difficulties both short- and long-term. The aim of the study was to provide a new brief ADHD screening scale that could be easily used by teachers and educational professionals in elementary schools. METHOD: Participants were teachers of 158 children with a prior diagnosis of ADHD and 169 children without a diagnosis of ADHD. An initial pool of 38 items was generated from ADHD symptoms of both DSM-5 and CIE-10 criteria, as well from Conners 3, EDAH, SDQ and ADHD-RS-IV scales...
August 2017: Psicothema
https://www.readbyqxmd.com/read/28692931/automatic-discrimination-of-actinic-keratoses-from-clinical-photographs
#17
Panagiota Spyridonos, Georgios Gaitanis, Aristidis Likas, Ioannis D Bassukas
BACKGROUND AND OBJECTIVE: Actinic keratoses (AK) are common premalignant skin lesions that can progress to invasive skin squamous cell carcinoma (sSCC). The subtle accumulation of multiple AK in aging individuals increases the risk of sSCC development, and this underscores the need for efficient treatment and patient follow-up. Our objectives were to develop a method based on color texture analysis of standard clinical photographs for the discrimination of AK from healthy skin and subsequently to test the developed approach in the quantification of field-directed treatment interventions...
July 3, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28684672/color-stability-of-new-esthetic-restorative-materials-a-spectrophotometric-analysis
#18
Claudio Poggio, Lodovico Vialba, Anna Berardengo, Ricaldone Federico, Marco Colombo, Riccardo Beltrami, Andrea Scribante
The aim of this in vitro study was to evaluate and compare the color stability of different esthetic restorative materials (one microfilled composite, one nanofilled composite, one nanoceramic composite, one microfilled hybrid composite, one microfilled hybrid composite, one nanohybrid Ormocer based composite and one supra-nano spherical hybrid composite) after exposure to different staining solutions (physiological saline, red wine, coffee). All materials were prepared and polymerized into silicon rings (2 mm × 6 mm × 8 mm) to obtain specimens identical in size...
July 6, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/28682320/management-of-atrial-high-rate-episodes-detected-by-cardiac-implanted-electronic-devices
#19
REVIEW
Ben Freedman, Giuseppe Boriani, Taya V Glotzer, Jeff S Healey, Paulus Kirchhof, Tatjana S Potpara
Cardiac implanted electronic devices (CIEDs), including pacemakers and implantable defibrillators that perform atrial sensing typically using an atrial electrode, frequently detect subclinical atrial high-rate episodes (AHREs). When the intracardiac electrograms are carefully examined, the majority of AHREs are atrial fibrillation (AF) or other atrial tachyarrhythmias, which have been shown to be associated with both an increased risk of stroke, and subsequent development of clinical AF. However, the absolute risk of stroke among patients with AHREs is less than might be expected for clinically diagnosed paroxysmal AF...
July 6, 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/28682289/color-assessment-after-bleaching-with-hydrogen-peroxide-versus-ozone-a-randomized-controlled-clinical-trial
#20
Arzu Aykut-Yetkiner, Fahinur Ertuğrul, Ece Eden, Akin Aladağ, Ecem Ergin, Mutlu Özcan
This randomized controlled clinical trial evaluated the color change of teeth bleached with either hydrogen peroxide (HP) or ozone (OZ). A total of 26 patients with a mean age of 36.2 years (SD, 8.7 years) who met the inclusion criteria were enrolled in the study. The subjects were randomly assigned to receive chairside bleaching using 40% HP or gaseous OZ. Maxillary dental arch vacuum trays were constructed with circumferential openings in the middle portion of the maxillary incisors at their labial surfaces...
July 2017: General Dentistry
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