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https://www.readbyqxmd.com/read/28816447/sequential-functionalizations-of-carbohydrates-enabled-by-boronic-esters-as-switchable-protective-activating-groups
#1
Ross S Mancini, Jessica B Lee, Mark S Taylor
Processes for site-selective, sequential functionalizations of carbohydrate derivatives are described. In these processes, a tricoordinate boronic ester initially serves as a protective group for a sugar-derived 1,2- or 1,3-diol motif, permitting functionalization of free OH groups. In a second step, addition of a Lewis base generates a tetracoordinate adduct, which serves as an activating group, enabling functionalization of one of the boron-bound oxygen atoms by a second electrophile. By combining an initial acylation, alkylation, or glycosylation step with an amine-mediated glycosylation of the boronic ester, a variety of selectively protected di- and trisaccharide derivatives can be accessed in an operationally simple fashion without purification of intermediates...
August 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28802951/smoke-on-the-water-oral-fluid-analysis-at-sea
#2
Andrew Griffiths, Richard Leonars, Lenore Hadley, Mark Stephenson, Richard Teale
This study outlines the operational challenges and findings of an illicit drug oral fluid testing program carried out on the skippers (those in charge) of water vessels in Queensland, Australia. Between 2010 and 2016, 953 tests of skippers were conducted on water (waterside) for three proscribed illicit drugs; delta-9-tetrahydrocannabinol (THC), methylamphetamine (MA) and 3,4-methylendioxymethylamphetamine (MDMA). 126 (13%) of the skippers tested returned an on-site positive during waterside testing, 125 were confirmed positive for one or more illicit drug by subsequent laboratory analysis, whilst one skipper did not provide an oral fluid sample for confirmatory analysis...
July 31, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28792543/oyster-toadfish-opsanus-tau-boatwhistle-call-detection-and-patterns-within-a-large-scale-oyster-restoration-site
#3
Shannon W Ricci, DelWayne R Bohnenstiehl, David B Eggleston, M Lisa Kellogg, R Patrick Lyon
During May 2015, passive acoustic recorders were deployed at eight subtidal oyster reefs within Harris Creek Oyster Sanctuary in Chesapeake Bay, Maryland USA. These sites were selected to represent both restored and unrestored habitats having a range of oyster densities. Throughout the survey, the soundscape within Harris Creek was dominated by the boatwhistle calls of the oyster toadfish, Opsanus tau. A novel, multi-kernel spectral correlation approach was developed to automatically detect these boatwhistle calls using their two lowest harmonic bands...
2017: PloS One
https://www.readbyqxmd.com/read/28777560/a-critical-crosscatalytic-relationship-determines-the-outcome-of-competition-in-a-replicator-network
#4
Tamara Kosikova, Douglas Philp
A network of two synthetic replicators exhibits a critical unidirectional crosscatalytic relationship that directs competing replication processes. In this network, nitrone N bearing a 6-methylamidopyridine recognition site can participate in two 1,3-dipolar cycloaddition reactions with two maleimides that differ in the relative position of their carboxylic acid recognition site - either para (Mp) or meta (Mm) relative to the maleimide ring. These two cycloaddition reactions create replicators trans-Tp and trans-Tm...
August 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28776822/ripple-mapping-initial-multicenter-experience-of-an-intuitive-approach-to-overcoming-the-limitations-of-3d-activation-mapping
#5
Vishal Luther, Nuno Cortez-Dias, Luis Carpinteiro, João de Sousa, Richard Navaratnum Balasubramaniam, Sharad C Agarwal, David Farwell, Solomon Mark Sopher, Girish Babu, Richard Till, Nikki Jones, Stuart Tan, Anthony Chow, Martin Lowe, Jem Lane, Naveen Pappachan, Nick Wf Linton, Prapa Kanagaratnam
BACKGROUND: Ripple Mapping (RM) displays electrograms as moving bars over a 3D surface displaying bipolar voltage, and has shown in a single-center series to be effective for atrial tachycardia (AT) mapping without annotation of local activation time or window-of-interest assignment. We tested the reproducibility of these findings in operators naive to RM, using it for the first time in post ablation AT. METHODS: Maps were collected with multielectrode catheters and CARTO ConfiDENSE...
August 4, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28770402/kinematic-efficacy-of-supplemental-anterior-lumbar-interbody-fusion-at-lumbosacral-levels-in-thoracolumbosacral-deformity-correction-with-and-without-pedicle-subtraction-osteotomy-at-l3-an-in-vitro-cadaveric-study
#6
Benny T Dahl, Jonathan A Harris, Manasa Gudipally, Mark Moldavsky, Saif Khalil, Brandon S Bucklen
PURPOSE: Pedicle subtraction osteotomy (PSO) is performed to treat rigid, sagittal spinal deformities, but high rates of implant failure are reported. Anterior lumbar interbody fusion has been proposed to reduce this risk, but biomechanical investigation is lacking. The goal of this study was to quantify the (1) destabilizing effects of a lumbar osteotomy and (2) contribution of anterior lumbar interbody fusion (ALIF) at the lumbosacral junction as recommended in literature. METHODS: Fourteen fresh human thoracolumbosacral spines (T12-S1) were tested in flexion-extension (FE), lateral bending (LB), and axial rotation (AR)...
August 2, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28769769/transplantation-of-hematopoietic-stem-cells-promotes-functional-improvement-associated-with-nt-3-mek-1-activation-in-spinal-cord-transected-rats
#7
Liu-Lin Xiong, Fei Liu, Shi-Kang Deng, Jia Liu, Qi-Qin Dan, Piao Zhang, Yu Zou, Qing-Jie Xia, Ting-Hua Wang
Transected spinal cord injury (SCT) is a devastating clinical disease that strongly affects a patient's daily life and remains a great challenge for clinicians. Stem-cell therapy has been proposed as a potential therapeutic modality for SCT. To investigate the effects of hematopoietic stem cells (HSCs) on the recovery of structure and function in SCT rats and to explore the mechanisms associated with recovery, 57 adult Sprague-Dawley rats were randomly divided into sham (n = 15), SCT (n = 24), and HSC transplantation groups (n = 15)...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28760035/minimally-invasive-versus-open-fusion-for-grade-i-degenerative-lumbar-spondylolisthesis-analysis-of-the-quality-outcomes-database
#8
Praveen V Mummaneni, Erica F Bisson, Panagiotis Kerezoudis, Steven Glassman, Kevin Foley, Jonathan R Slotkin, Eric Potts, Mark Shaffrey, Christopher I Shaffrey, Domagoj Coric, John Knightly, Paul Park, Kai-Ming Fu, Clinton J Devin, Silky Chotai, Andrew K Chan, Michael Virk, Anthony L Asher, Mohamad Bydon
OBJECTIVE Lumbar spondylolisthesis is a degenerative condition that can be surgically treated with either open or minimally invasive decompression and instrumented fusion. Minimally invasive surgery (MIS) approaches may shorten recovery, reduce blood loss, and minimize soft-tissue damage with resultant reduced postoperative pain and disability. METHODS The authors queried the national, multicenter Quality Outcomes Database (QOD) registry for patients undergoing posterior lumbar fusion between July 2014 and December 2015 for Grade I degenerative spondylolisthesis...
August 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28753219/the-retrograde-transverse-cervical-artery-as-a-recipient-vessel-for-free-tissue-transfer-in-complex-head-and-neck-reconstruction-with-a-vessel-depleted-neck
#9
Pedro Ciudad, Mouchammed Agko, Oscar J Manrique, Shivprasad Date, Kidakorn Kiranantawat, Wei Ling Chang, Fabio Nicoli, Federico Lo Torto, Michele Maruccia, Georgios Orfaniotis, Hung-Chi Chen
BACKGROUND: Reconstruction in a vessel-depleted neck is challenging. The success rates can be markedly decreased because of unavailability of suitable recipient vessels. In order to obtain a reliable flow, recipient vessels away from the zone of fibrosis, radiation, or infection need to be explored. The aim of this report is to present our experience and clinical outcomes using the retrograde flow coming from the distal transverse cervical artery (TCA) as a source for arterial inflow for complex head and neck reconstruction in patients with a vessel-depleted neck...
July 28, 2017: Microsurgery
https://www.readbyqxmd.com/read/28746285/a-comparative-analysis-of-recombinant-human-bone-morphogenetic-protein-2-with-a-demineralized-bone-matrix-versus-iliac-crest-bone-graft-for-secondary-alveolar-bone-grafts-in-patients-with-cleft-lip-and-palate-review-of-501-cases
#10
Jeffrey A Hammoudeh, Artur Fahradyan, Daniel J Gould, Fan Liang, Thomas Imahiyerobo, Leo Urbinelli, JoAnna T Nguyen, William Magee, Stephen Yen, Mark M Urata
BACKGROUND: Alveolar cleft reconstruction using iliac crest bone graft is considered standard of care for children with complete cleft lip and palate at the time of mixed dentition. Harvesting bone may result in donor-site morbidity and additional operating time and length of hospitalization. Recombinant human bone morphogenetic protein (rhBMP)-2 with a demineralized bone matrix is an alternative bone source for alveolar cleft reconstruction. The authors investigated the outcomes of rhBMP-2/demineralized bone matrix versus iliac crest bone graft for alveolar cleft reconstruction by reviewing postoperative surgical complications and cleft closure...
August 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28731937/an-adapted-clavien-dindo-scoring-system-in-trauma-as-a-clinically-meaningful-nonmortality-endpoint
#11
David N Naumann, Laura E Vincent, Nicola Pearson, Alastair Beaven, Iain M Smith, Kieran Smith, Emma Toman, Helen R Dorrance, Keith Porter, Charles E Wade, Bryan A Cotton, John B Holcomb, Mark J Midwinter
BACKGROUND: There is no consensus on reporting nonmortality trauma complications in a graded manner. The Clavien-Dindo scale of complications was originally for elective surgery and requires adaptation to provide meaningful data for trauma patients. In particular, the original score does not account for those treated without surgery. We report an adapted Clavien-Dindo in trauma (ACDiT) scale and apply it to patients managed operatively and nonoperatively. METHODS: A combined prospective and retrospective international multicenter observational study was undertaken to apply the ACDiT scale to 484 trauma patients at three university teaching hospitals (Birmingham, England (n = 303); Houston, Texas (n = 113); and Glasgow, Scotland (n = 68))...
August 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28730321/age-and-dressing-type-as-independent-predictors-of-post-operative-infection-in-patients-with-acute-compartment-syndrome-of-the-lower-leg
#12
Mark E Hake, Jordan Etscheidt, Vivek P Chadayammuri, Jacob M Kirsch, Cyril Mauffrey
PURPOSE: The purpose of this study was to determine independent factors, including timing of fasciotomy, that confer an increased risk of post-operative surgical site infection (SSI) in patients presenting with acute compartment syndrome (ACS) of the lower extremity. METHODS: A retrospective analysis was performed on a consecutive cohort of 53 adult patients requiring fasciotomy for lower-extremity fractures complicated by ACS presenting to a single Level I trauma center over a seven-year study period...
July 20, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28728480/safety-and-efficacy-of-stenting-nonthrombotic-iliac-vein-lesions-in-octogenarians-and-nonagenarians-in-an-office-setting
#13
Pavel Kibrik, Justin Eisenberg, Ahmad Alsheekh, Syed Ali Rizvi, Afsha Aurshina, Natalie Marks, Anil Hingorani, Enrico Ascher
Objectives Treatment options for venous insufficiency are rapidly evolving in the office setting and include venography, intravascular ultrasound, and venous stenting. Non-thrombotic iliac vein lesions assessment and treatment in an office setting is currently an area of interest. The purpose of this study is to demonstrate the safety and efficacy of evaluating non-thrombotic iliac vein lesion with this office-based procedure in octogenarians and nonagenarians. Methods From January 2012 through December 2013, 300 non-thrombotic iliac vein lesion limbs in 192 patients with venous insufficiency ≥80 years old were evaluated for non-thrombotic iliac vein lesion...
January 1, 2017: Vascular
https://www.readbyqxmd.com/read/28726138/trainee-associated-outcomes-in-laparoscopic-colectomy-for-cancer-propensity-score-analysis-accounting-for-operative-time-procedure-complexity-and-patient-comorbidity
#14
Kevin R Kasten, Adam C Celio, Lauren Trakimas, Mark L Manwaring, Konstantinos Spaniolas
BACKGROUND: Surgical trainee association with operative outcomes is controversial. Studies are conflicting, possibly due to insufficient control of confounding variables such as operative time, case complexity, and heterogeneous patient populations. As operative complications worsen long-term outcomes in oncologic patients, understanding effect of trainee involvement during laparoscopic colectomy for cancer is of utmost importance. Here, we hypothesized that resident involvement was associated with worsened 30-day mortality and 30-day overall morbidity in this patient population...
July 19, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28712813/factors-affecting-operative-time-and-outcome-of-carotid-endarterectomy-in-the-vascular-quality-initiative
#15
Jennifer L Perri, Brian W Nolan, Philip P Goodney, Randall R DeMartino, Benjamin S Brooke, Shipra Arya, Mark F Conrad, Jack L Cronenwett
OBJECTIVE: Prior studies have suggested a relationship between operative (Op) time and outcome after major vascular procedures. This study analyzed factors associated with Op time and outcome after carotid endarterectomy (CEA) in the Vascular Quality Initiative (VQI) registry. METHODS: Elective, primary CEAs without high anatomic risk or concomitant procedures from 2012 to 2015 in the VQI were analyzed (N = 26,327, performed by 1188 surgeons from 249 centers). Multivariable analysis was used to identify patient, procedure, and surgeon factors associated with Op time and major adverse events (MAEs), categorized as either technical (ipsilateral stroke, cranial nerve injury, reoperation) or cardiac (myocardial infarction, congestive heart failure, dysrhythmia requiring treatment, surgical site infection, and death)...
July 13, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28698088/microsurgical-repair-of-ruptured-aneurysms-associated-with-moyamoya-pattern-collateral-vessels-of-the-middle-cerebral-artery-a-report-of-two-cases
#16
Min Lang, Nina Z Moore, Alex M Witek, Varun R Kshettry, Mark Bain
BACKGROUND: Patients with Moyamoya or other intracranial steno-occlusive disease are at risk for developing aneurysms associated with flow through collateral vessels. Because these lesions are rare, the optimal management remains unclear. Here, we describe two cases of microsurgical repair of ruptured collateral vessel aneurysms associated with middle cerebral artery (MCA) occlusion. CASE DESCRIPTION: The first patient was a 61-year-old male who presented with right frontal and intraventricular hemorrhage...
July 8, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28684933/technical-considerations-in-stoma-creation
#17
REVIEW
Alia Whitehead, Peter A Cataldo
Creating an intestinal stoma is commonly the final aspect of an often emergent and complicated operation under difficult circumstances. While creation of a protruding, tension-free, and well-vascularized stoma is often straightforward, one must be prepared for challenging situations such as a thick abdominal wall and short, thickened mesentery. A successful stoma starts with attentive preoperative planning including site marking, thoughtful consideration of alternatives, and attention to technical detail. The tips provided in this article should facilitate the process of selecting the appropriate intestinal segment, identifying the correct stoma site, and creating a functional stoma even in the most challenging situations...
July 2017: Clinics in Colon and Rectal Surgery
https://www.readbyqxmd.com/read/28684932/preoperative-considerations-for-the-ostomate
#18
REVIEW
Molly A Wasserman, Michael F McGee
Intestinal stomas significantly impact patients' quality of life. Stoma-related complications are common, but even without complications, patients are faced with new challenges in stoma management and daily activities. Preoperative patient education and stoma site marking, in conjunction with conscientious surgical stewardship, are key to patient satisfaction and successful operative outcomes.
July 2017: Clinics in Colon and Rectal Surgery
https://www.readbyqxmd.com/read/28668274/impact-of-time-between-diagnosis-and-slnb-on-outcomes-in-cutaneous-melanoma
#19
Daniel W Nelson, Stacey Stern, David E Elashoff, Robert Elashoff, John F Thompson, Nicola Mozzillo, Omgo E Nieweg, Harald J Hoekstra, Alistair J Cochran, Mark B Faries
BACKGROUND: Hypothetically, delay between melanoma diagnosis and SLNB could affect outcomes, either adversely by allowing growth and dissemination of metastases, or beneficially by allowing development of an anti-melanoma immune response. Available data are conflicting about the effect of SLNB delay on patient survival. Our objective was to determine whether delay between initial diagnosis and SLNB affects outcomes in patients with cutaneous melanoma. STUDY DESIGN: We performed query and analysis of a large prospectively maintained database of patients with primary cutaneous melanomas undergoing SLNB...
August 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/28665773/implementing-and-sustaining-team-based-telecare-for-bipolar-disorder-lessons-learned-from-a-model-guided-mixed-methods-analysis
#20
Mark S Bauer, Lois Krawczyk, Kathy Tuozzo, Cara Frigand, Sally Holmes, Christopher J Miller, Erica Abel, David N Osser, Aleda Franz, Cynthia Brandt, Meghan Rooney, Jerry Fleming, Eric Smith, Linda Godleski
BACKGROUND: Telemental health interventions have empirical support from clinical trials and structured demonstration projects. However, their implementation and sustainability under less structured clinical conditions are not well demonstrated. INTRODUCTION: We conducted a follow-up analysis of the implementation and sustainability of a clinical video teleconference-based collaborative care model for individuals with bipolar disorder treated in the Department of Veterans Affairs to (a) characterize the extent of implementation and sustainability of the program after its establishment and (b) identify barriers and facilitators to implementation and sustainability...
June 30, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
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