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https://www.readbyqxmd.com/read/28528636/correlative-two-photon-and-serial-block-face-scanning-electron-microscopy-in-neuronal-tissue-using-3d-near-infrared-branding-maps
#1
Robert M Lees, Christopher J Peddie, Lucy M Collinson, Michael C Ashby, Paul Verkade
Linking cellular structure and function has always been a key goal of microscopy, but obtaining high resolution spatial and temporal information from the same specimen is a fundamental challenge. Two-photon (2P) microscopy allows imaging deep inside intact tissue, bringing great insight into the structural and functional dynamics of cells in their physiological environment. At the nanoscale, the complex ultrastructure of a cell's environment in tissue can be reconstructed in three dimensions (3D) using serial block face scanning electron microscopy (SBF-SEM)...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28525260/three-dimensional-visualization-and-characterization-of-polymeric-self-assemblies-by-transmission-electron-microtomography
#2
Hiroshi Jinnai, Takeshi Higuchi, Xiaodong Zhuge, Akihito Kumamoto, Kees Joost Batenburg, Yuichi Ikuhara
Self-assembling structures and their dynamical processes in polymeric systems have been investigated using three-dimensional transmission electron microscopy (3D-TEM). Block copolymers (BCPs) self-assemble into nanoscale periodic structures called microphase-separated structures, a deep understanding of which is important for creating nanomaterials with superior physical properties, such as high-performance membranes with well-defined pore size and high-density data storage media. Because microphase-separated structures have become increasingly complicated with advances in precision polymerization, characterizing these complex morphologies is becoming increasingly difficult...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28514493/the-narrow-road-to-the-deep-past
#3
Jack W Szostak
The sequence of events that gave rise to the first life on our planet took place in the Earth's deep past, seemingly forever beyond our reach. Perhaps for that very reason the idea of reconstructing our ancient story is tantalizing, almost irresistible. Understanding the processes that led to synthesis of the chemical building blocks of biology and the ways in which these molecules self-assembled into cells that could grow, divide and evolve, nurtured by a rich and complex environment, seems at times insurmountably difficult...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28494892/postoperative-analgesic-efficacy-of-single-shot-and-continuous-transversus-abdominis-plane-block-after-laparoscopic-cholecystectomy-a-randomized-controlled-clinical-trial
#4
Yun-Mi Choi, Gyeong-Jo Byeon, Soon-Ji Park, Young-Min Ok, Sang-Wook Shin, Kwangho Yang
STUDY OBJECTIVE: To compare the analgesic efficacy of ultrasound-guided single-shot and continuous transversus abdominis plane (TAP) block to that of IV-PCA in patients undergoing laparoscopic cholecystectomy. DESIGN: Prospective randomized controlled trial. SETTING: Post-anesthesia care unit and General ward. PATIENTS: 108 American Society of Anesthesiologist (ASA) physical status I-II patients undergoing laparoscopic cholecystectomy...
June 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28494436/neuronal-tetraploidization-in-the-cerebral-cortex-correlates-with-reduced-cognition-in-mice-and-precedes-and-recapitulates-alzheimer-s-associated-neuropathology
#5
Noelia López-Sánchez, Ángela Fontán-Lozano, Anna Pallé, Valentina González-Álvarez, Alberto Rábano, José L Trejo, José M Frade
A controversy exists as to whether de novo-generated neuronal tetraploidy (dnNT) occurs in Alzheimer's disease. In addition, the presence of age-associated dnNT in the normal brain remains unexplored. Here we show that age-associated dnNT occurs in both superficial and deep layers of the cerebral cortex of adult mice, a process that is blocked in the absence of E2F1, a known regulator of cell cycle progression. This blockage correlates with improved cognition despite compromised neurogenesis in the adult hippocampus was confirmed in mice lacking the E2f1 gene...
April 18, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28493510/comparison-of-reversal-with-neostigmine-of-low-dose-rocuronium-vs-reversal-with-sugammadex-of-high-dose-rocuronium-for-a-short-procedure
#6
E S Choi, A Y Oh, B W Koo, J W Hwang, J W Han, K S Seo, S H Ahn, W J Jeong
Some short procedures require deep neuromuscular blockade, which needs to be reversed at the end of the procedure. Forty-four patients undergoing elective laryngeal micro-surgery were randomly allocated into two groups: rocuronium 0.45 mg.kg(-1) with neostigmine (50 μg.kg(-1) with glycopyrrolate 10 μg.kg(-1) ) reversal (moderate block group) vs. rocuronium 0.90 mg.kg(-1) with sugammadex (4 mg.kg(-1) ) reversal (deep block group). The primary outcome was the intubating conditions during laryngoscopy secondary outcomes included recovery of neuromuscular block; conditions for tracheal intubation; satisfaction score as determined by the surgeon; onset of neuromuscular block; and postoperative sore throat...
May 11, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28479941/crystallization-kinetics-of-gesbte-phase-change-nanoparticles-resolved-by-ultrafast-calorimetry
#7
Bin Chen, Gert H Ten Brink, George Palasantzas, Bart J Kooi
Although nanostructured phase-change materials (PCMs) are considered as the building blocks of next-generation phase-change memory and other emerging optoelectronic applications, the kinetics of the crystallization, the central property in switching, remains ambiguous in the high-temperature regime. Therefore, we present here an innovative exploration of the crystallization kinetics of Ge2Sb2Te5 (GST) nanoparticles (NPs) exploiting differential scanning calorimetry with ultrafast heating up to 40 000 K s(-1)...
April 20, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28478834/3d-printed-liner-for-treatment-of-periprosthetic-joint-infections
#8
Tae Won B Kim, Osvaldo J Lopez, Jillian P Sharkey, Kyle R Marden, Muhammad Ridwan Murshed, Shivakumar I Ranganathan
In the United States, long standing deep infections of joint arthroplasty, such as total knee and total hip replacements, are treated with two-stage exchange. This requires the removal of the prior implant, placement of an antibiotic eluting spacer block made of polymethylmethacrylate (PMMA), followed by re-implantation of a new implant after treatment with intravenous antibiotics for six to eight weeks. Unfortunately, the use of PMMA as a spacer material has limitations in terms of mechanical and drug-eluting properties...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28476642/properties-of-the-corticostriatal-long-term-depression-induced-by-medial-prefrontal-cortex-high-frequency-stimulation-in%C3%A2-vivo
#9
Barbara Y Braz, Juan E Belforte, M Gustavo Murer, Gregorio L Galiñanes
Repetitive stimulation of cognitive forebrain circuits at frequencies capable of inducing corticostriatal long term plasticity is increasingly being used with therapeutic purposes in patients with neuropsychiatric disorders. However, corticostriatal plasticity is rarely studied in the intact brain. Our aim was to study the mechanisms of corticostriatal long term depression (LTD) induced by high frequency stimulation (HFS) of the medial prefrontal cortex in vivo. Our main finding is that the LTD induced in the dorsomedial striatum by medial prefrontal cortex HFS in vivo (prefrontostriatal LTD) is not affected by manipulations that block or reduce the LTD induced in the dorsolateral striatum by motor cortex HFS in brain slices, including pharmacological dopamine receptor and CB1 receptor blockade, chronic nigrostriatal dopamine depletion, CB1 receptor genetic deletion and selective striatal cholinergic interneuron (SCIN) ablation...
May 2, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28467317/deep-learning-based-artificial-vision-for-grasp-classification-in-myoelectric-hands
#10
Ghazal Ghazaei, Ali Alameer, Patrick Degenaar, Graham Morgan, Kianoush Nazarpour
OBJECTIVE: Computer vision-based assistive technology solutions can revolutionise the quality of care for people with sensorimotor disorders. The goal of this work was to enable trans-radial amputees to use a simple, yet efficient, computer vision system to grasp and move common household objects with a two-channel myoelectric prosthetic hand. APPROACH: We developed a deep learning-based artificial vision system to augment the grasp functionality of a commercial prosthesis...
May 3, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28459126/localization-of-nerve-entry-points-as-targets-to-block-spasticity-of-the-deep-posterior-compartment-muscles-of-the-leg
#11
Shuaiyu Hu, Lifan Zhuo, Xiaoming Zhang, Shengbo Yang
To identify the optimal body surface puncture locations and the depths of nerve entry points (NEPs) in the deep posterior compartment muscles of the leg, sixty lower limbs of thirty adult cadavers were dissected in prone position. A curved line on the skin surface joining the lateral to the medial epicondyles of the femur was taken as a horizontal reference line (H). Another curved line joining the lateral epicondyle of the femur to the lateral malleolus was designated the longitudinal reference line (L). Following dissection, the NEPs were labeled with barium sulfate and then subjected to spiral computed tomography scanning...
April 29, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28457062/profile-of-patients-presenting-for-cataract-surgery-in-a-public-hospital-a-15-year-perspective
#12
Adir Sommer, Avner Belkin, Shay Ofir, Ehud Assia
BACKGROUND: In recent decades cataract surgery has shifted slowly from public hospitals to ambulatory surgery centers, demonstrating changes in the profile of patients presenting to public hospitals for cataract surgery. These changes may potentially affect the complexity of surgeries, their volume, resident training, and perhaps also visual outcomes and patient satisfaction. OBJECTIVES: To assess the changes in the medical and demographic characteristics of patients undergoing cataract surgery in a public hospital over a period of 15 years...
February 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28456211/controlling-charge-transport-mechanisms-in-molecular-junctions-distilling-thermally-induced-hopping-from-coherent-resonant-conduction
#13
Hyehwang Kim, Dvira Segal
The electrical conductance of molecular junctions may depend strongly on the temperature and weakly on molecular length, under two distinct mechanisms: phase-coherent resonant conduction, with charges proceeding via delocalized molecular orbitals, and incoherent thermally assisted multi-step hopping. While in the case of coherent conduction, the temperature dependence arises from the broadening of the Fermi distribution in the metal electrodes, in the latter case it corresponds to electron-vibration interaction effects on the junction...
April 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28455405/respiration-driven-excessive-sinus-tachycardia-treated-with-clonidine
#14
Matthew Emile Li Kam Wa, Patricia Taraborrelli, Sajad Hayat, Phang Boon Lim
A 26-year-old man presented to our syncope service with debilitating daily palpitations, shortness of breath, presyncope and syncope following a severe viral respiratory illness 4 years previously. Mobitz type II block had previously been identified, leading to a permanent pacemaker and no further episodes of frank syncope. Transthoracic echocardiography, electophysiological study and repeated urine metanepherines were normal. His palpitations and presyncope were reproducible on deep inspiration, coughing, isometric hand exercise and passive leg raises...
April 28, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28448393/deep-neuromuscular-block-and-surgical-conditions-during-bariatric-surgery
#15
Martijn Boon, Chris H Martini, Leon P Aarts, Bart Torensma, Albert Dahan
No abstract text is available yet for this article.
June 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28446503/sensitivity-and-specificity-of-cetuximab-irdye800cw-to-identify-regional-metastatic-disease-in-head-and-neck-cancer
#16
Eben Rosenthal, Lindsay Moore, Kiranya Tipirneni, Esther de Boer, Todd M Stevens, Yolanda E Hartman, William R Carroll, Kurt R Zinn, Jason M Warram
Purpose: Comprehensive cervical lymphadenectomy can be associated with significant morbidity and poor quality of life. This study evaluated the sensitivity and specificity of cetuximab-IRDye800CW to identify metastatic disease in patients with head and neck cancer. <p>Experimental Design: Consenting patients scheduled for curative resection were enrolled in a clinical trial to evaluate the safety and specificity of cetuximab-IRDye800CW. Patients (n=12) received escalating doses of the study drug. Where indicated, cervical lymphadenectomy accompanied primary tumor resection, which occurred 3-7days following intravenous infusion of cetuximab-IRDye800CW...
April 26, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28444636/modulatory-effects-of-perineuronal-oligodendrocytes-on-neuronal-activity-in-the-rat-hippocampus
#17
Yoshihiko Yamazaki, Yasukazu Hozumi, Kenya Kaneko, Satoshi Fujii
Action potentials are fundamental to relaying information from region to region in the nervous system. Changes in action potential firing patterns in neural circuits influence how the brain processes information. In our previous study, we focused on interneuron/perineuronal astrocyte pairs in the hippocampal CA1 region and reported that direct depolarization of perineuronal astrocytes modulated the firing pattern of interneurons. In the current study, we investigated the morphological and electrophysiological properties of perineuronal oligodendrocytes, and examined their modulatory effects on interneuronal firing in the CA1 region...
April 25, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28441466/biomonitoring-of-marine-vertebrates-in-monterey-bay-using-edna-metabarcoding
#18
Elizabeth A Andruszkiewicz, Hilary A Starks, Francisco P Chavez, Lauren M Sassoubre, Barbara A Block, Alexandria B Boehm
Molecular analysis of environmental DNA (eDNA) can be used to assess vertebrate biodiversity in aquatic systems, but limited work has applied eDNA technologies to marine waters. Further, there is limited understanding of the spatial distribution of vertebrate eDNA in marine waters. Here, we use an eDNA metabarcoding approach to target and amplify a hypervariable region of the mitochondrial 12S rRNA gene to characterize vertebrate communities at 10 oceanographic stations spanning 45 km within the Monterey Bay National Marine Sanctuary (MBNMS)...
2017: PloS One
https://www.readbyqxmd.com/read/28439702/a-comparison-of-apixaban-and-dabigatran-etexilate-for-thromboprophylaxis-following-hip-and-knee-replacement-surgery
#19
Adriane Mayer, Philipp Schuster, Bernd Fink
INTRODUCTION: Patients who have undergone hip or knee replacement surgery are exposed to a high risk of developing a post-operative venous thromboembolus and so have a need for an effective, medication-based, thrombosis prophylaxis. New orally active anticoagulants have been available for a few years now. These specific substances directly block either thrombin (e.g., dabigatran etexilate) or Factor Xa (e.g., apixaban). It is not clear whether there are any efficacy differences between these two substances because there have never been any head-to-head studies carried out...
April 24, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28428345/proliferation-of-primary-human-hepatocytes-and-prevention-of-hepatitis-b-virus-reinfection-efficiently-deplete-nuclear-cccdna-in-vivo
#20
Lena Allweiss, Tassilo Volz, Katja Giersch, Janine Kah, Giuseppina Raffa, Joerg Petersen, Ansgar W Lohse, Concetta Beninati, Teresa Pollicino, Stephan Urban, Marc Lütgehetmann, Maura Dandri
OBJECTIVE: The stability of the covalently closed circular DNA (cccDNA) in nuclei of non-dividing hepatocytes represents a key determinant of HBV persistence. Contrarily, studies with animal hepadnaviruses indicated that hepatocyte turnover can reduce cccDNA loads but knowledge on the proliferative capacity of HBV-infected primary human hepatocytes (PHHs) in vivo and the fate of cccDNA in dividing PHHs is still lacking. This study aimed to determine the impact of human hepatocyte division on cccDNA stability in vivo...
April 20, 2017: Gut
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