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Hang Ren, Cameron G Cheyne, Aaron M Fleming, Cynthia J Burrows, Henry S White
Measurement of single-molecule reactions can elucidate microscopic mechanisms that are often hidden from ensemble analysis. Herein, we report the acid-base titration of a single DNA duplex confined within the wild-type α-hemolysin (α-HL) nanopore for up to 3 h, while monitoring the ionic current through the nanopore. Modulation between two states in the current-time trace for duplexes containing the C:C mismatch in proximity to the latch constriction of α-HL is attributed to the base flipping of the C:C mismatch...
March 21, 2018: Journal of the American Chemical Society
Pyae Phyo, Tuo Wang, Yu Yang, Hugh M O'Neill, Mei Hong
In contrast to the well-studied crystalline cellulose of microbial and animal origins, cellulose in plant cell walls is disordered due to its interactions with matrix polysaccharides. Plant cell wall (PCW) is an undisputed source of sustainable global energy, therefore it is important to determine the molecular structure of PCW cellulose. The most reactive component of cellulose is the exocyclic hydroxymethyl group: when it adopts the tg conformation, it stabilizes intra-chain and inter-chain hydrogen bonding, while gt and gg conformations destabilize the hydrogen-bonding network...
March 21, 2018: Biomacromolecules
Hiroshi Matsui, Soichi Ito, Masayoshi Nakano
The open-shell character dependences of second hyperpolarizability γ is investigated for rectangular-shaped tetraradicaloid models such as diradical dimers, using numerically exact solutions of the extended Hubbard model. The newly-defined local diradical characters for intra- and inter-molecular interactions (referred to as yintra and yinter, respectively) are compared to conventional global ones (y0 and y1) and provide comprehensive understanding of the electronic structure of the system. The system shows two kinds of enhancements of γ components, γintra and γinter (caused, respectively, by intra- and inter-molecular diradical interactions): (i) the system with large yintra (yinter) (> ~0...
March 21, 2018: Journal of Physical Chemistry. A
Nuket Kartal Temel, Ramazan Gürkan
A novel ultrasound assisted-cloud point extraction method was developed for preconcentration and determination of V(V) in beverage samples. After complexation by pyrogallol in presence of safranin T at pH 6.0, V(V) ions as ternary complex are extracted into the micellar phase of Triton X-114. The complex was monitored at 533 nm by spectrophotometry. The matrix effect on the recovery of V(V) from the spiked samples at 50 μg L-1 was evaluated. In optimized conditions, the limits of detection and quantification of the method, respectively, was 0...
March 2018: Acta Chimica Slovenica
Lilian Vieira Oliveira, Thais Souza Maia, Karla Zancopé, Murilo de Souza Menezes, Carlos José Soares, Camilla Christian Gomes Moura
The presence of residues within the root canal after post-space preparation can influence the bond strength between resin cement and root dentin when using fiberglass posts (FGPs). Currently, there is no consensus in the literature regarding what is the best solution for the removal of debris after post-space preparation. This systematic review involved "in vitro" studies to investigate if cleaning methods of the root canal after post-space preparation can increase the retention of FGPs evaluated by the push-out test...
March 15, 2018: Brazilian Oral Research
Masanori Takabayashi, Hassaan Majeed, Andre Kajdacsy-Balla, Gabriel Popescu
Tissue refractive index provides important information about morphology at the nanoscale. Since the malignant transformation involves both intra- and inter-cellular changes in the refractive index map, the tissue disorder measurement can be used to extract important diagnosis information. Quantitative phase imaging (QPI) provides a practical means of extracting this information as it maps the optical path-length difference (OPD) across a tissue sample with sub-wavelength sensitivity. In this work, we employ QPI to compare the tissue disorder strength between benign and malignant breast tissue histology samples...
2018: PloS One
Shereef Shahen, Gennaro Carrino, Rossella Carrino, Reham Abdelsalam, Carlos Flores-Mir, Letizia Perillo
OBJECTIVES: The objective of this study was to develop a reproducible method to measure the change of palatal volume and area through superimposition using maxillary expansion digital cast models. MATERIALS AND METHODS: A total of 10 pre- and 10 postexpansion dental cast models were scanned by the same cone-beam computed tomography machine. Superimposition was performed using a fully automated surface-best fit of the palatal surfaces on the digital cast models. A gingival plane, identified only once on superimposed casts, and a distal plane with the lateral closing border and the palatal surface were used to localize this selection of air...
March 21, 2018: Angle Orthodontist
Yu S Vinnik, R A Pakhomova, L V Kochetova, E A Voronova, V V Kozlov, A K Kirichenko
AIM: To develop predictive model for hepatic insufficiency in obstructive jaundice. MATERIAL AND METHODS: Obstructive jaundice was modeled by the author's method on 48 mini pigs, while morpho-functional features of erythrocytes were studied by using of INTEGRA Aura atomic force microscope (NT-MDT, Zelenograd, Russia). Histological specimens were stained with hematoxylin and eosin. Discriminant analysis was used to create predictive model for hepatic insufficiency...
2018: Khirurgiia
Nadine Musallam, Diana Altshuler, Cristian Merchan, Bishoy Zakhary, Caitlin Aberle, John Papadopoulos
BACKGROUND: There is little data guiding clinicians on how to discontinue vasopressors among septic shock patients on concomitant norepinephrine (NE) and vasopressin (VP). OBJECTIVE: To determine the incidence of hypotension within 24 hours of discontinuing NE (NE DC first) versus VP (VP DC first) first in septic shock patients. METHODS: This retrospective study evaluated septic shock patients admitted to the medical intensive care unit (MICU) and surgical ICU (SICU) receiving concomitant NE and VP...
March 1, 2018: Annals of Pharmacotherapy
Z Mzoughi, R Bayar, S Omrani, H Smati, Dhouba Bacha, M T Khalfallah
No abstract text is available yet for this article.
April 2017: Acta Gastro-enterologica Belgica
David L Chan, Matthew Dixon, Calvin H L Law, Serge Koujanian, Kaitlyn A Beyfuss, Simron Singh, Sten Myrehaug, Julie Hallet
BACKGROUND: Neuroendocrine tumors (NETs) have a uniquely indolent biology. Management focuses on tumor and hormonal burden reduction. Data on cytoreduction with extrahepatic disease remain limited. OBJECTIVE: We sought to define the outcomes of cytoreduction for metastatic NETs with extrahepatic metastases. METHODS: Patients undergoing cytoreductive surgery for grade 1 or 2 NETs with extrahepatic metastases (with or without intrahepatic disease) were identified from an institutional database (2003-2014)...
March 20, 2018: Annals of Surgical Oncology
Daniele Marchioni, Stefano De Rossi, Davide Soloperto, Livio Presutti, Luca Sacchetto, Alessia Rubini
OBJECTIVE: To define a new surgical option, with lower morbidity, for the treatment of intralabyrinthine schwannomas. STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral centers. PATIENTS: Eight patients affected by an intralabyrinthine schwannoma, with or without extension to the internal auditory canal, that underwent surgery with a transcanal transpromontorial approach, were included in the study. The average age at presentation was 47 years...
March 20, 2018: European Archives of Oto-rhino-laryngology
Jesse Lowe, Rohan Bansal, Stephen Badylak, Bryan Brown, William Chung, Alejandro Almarza
A subset of temporomandibular joint (TMJ) disorders are attributed to joint degeneration. The pig has been considered the preferred in-vivo model for the evaluation of potential therapies for TMJ disorders, and practical considerations such as cost and husbandry issues have favored the use of young, skeletally immature animals. However, the effect of growth on the biochemical and biomechanical properties of the TMJ disc and articulating cartilage has not been examined. The present study investigates the effect of age on the biochemical and biomechanical properties of healthy porcine TMJs at 3, 6, and 9 months of age...
March 19, 2018: Journal of Biomechanical Engineering
Nimrod Dar, Alexander Rubowitz
Purpose: To report a unique case of pseudo-duplication of the optic disc with maculo-schisis. Observations: A 9-year-old girl presented with decreased vision in the left eye. Her measured visual acuity was 20/50. Dilated fundus examination revealed an optic disc-like lesion with a large crater-like depression, pale color and aberrant retinal vasculature arising from its lower region. Optical coherence tomography (OCT) demonstrated maculo-schisis emerging from the optic disc complex and involving the foveal region...
June 2018: American Journal of Ophthalmology Case Reports
Chong Meng Lee, Malkit K Dhillon, Mohd Amin Sulaiman
Background: The use of navigation for total knee arthroplasty (TKA) improves limb alignment in the coronal and sagittal planes. However, similar improvements in femoral and tibial component rotation have not yet been realized using currently available systems. Methods: We developed a modified navigated TKA technique in which femoral rotation was set using the resected tibial plane as the reference with the aim of achieving a rectangular flexion gap. Limb alignment was assessed in a cohort of 30 knees using the navigation system...
March 2018: Arthroplasty Today
Jörn Grensemann
Routine use of cardiac output (CO) monitoring became available with the introduction of the pulmonary artery catheter into clinical practice. Since then, several systems have been developed that allow for a less-invasive CO monitoring. The so-called "non-calibrated pulse contour systems" (PCS) estimate CO based on pulse contour analysis of the arterial waveform, as determined by means of an arterial catheter without additional calibration. The transformation of the arterial waveform signal as a pressure measurement to a CO as a volume per time parameter requires a concise knowledge of the dynamic characteristics of the arterial vasculature...
2018: Frontiers in Medicine
Francesco Ioppolo, Fabiana Saracino, Rosaria Sabrina Rizzo, Giampaolo Monacelli, Danilo Lanni, Luca Di Sante, Angelo Cacchio, Valter Santilli, Teresa Venditto
Objective: To compare extracorporeal shockwave therapy (ESWT) with hyaluronic acid (HA) intra-articular injections in terms of pain relief, improvement in hand function, and strength in subjects with first carpometacarpal (CMC) joint osteoarthritis. Methods: Fifty-eight patients received either focused ESWT or HA injection once a week for 3 consecutive weeks. In the ESWT group, 2,400 consecutive pulses were performed during each treatment session using a frequency of 4 Hz and an energy flux density of 0...
February 2018: Annals of Rehabilitation Medicine
Annet Bluschke, Krutika Gohil, Maxi Petzold, Veit Roessner, Christian Beste
Attention Deficit Hyperactivity Disorder (ADHD) is a disorder affecting cognitive control. These functions are important to achieve goals when different actions need to be executed in close succession. This type of multi-component behavior, which often further requires the processing of information from different modalities, is important for everyday activities. Yet, possible changes in neurophysiological mechanisms have not been investigated in adolescent ADHD. We examined N = 31 adolescent ADHD patients and N = 35 healthy controls (HC) in two Stop-Change experiments using either uni-modal or bi-modal stimuli to trigger stop and change processes...
2018: NeuroImage: Clinical
Cassandra Wasson, Telianne Chon
A 28-year-old term G3P0020 received an epidural with complete pain relief. Approximately 19 hours after the epidural placement, the pain increased. Sensory levels were rechecked and were bilateral and adequate at T8. Further discussion revealed that the pain was unrelated to her contractions; it was in her buttocks and radiating down the leg. The possibility of the fetus being positioned occiput posterior (OP) was discussed. The patient was placed into knee-chest position with instantaneous relief of her pain...
January 17, 2018: Curēus
Dae Y Han, Lijun Ma, Steve Braunstein, David Raleigh, Patricia K Sneed, Michael McDermott
Background and Objectives Intra-parenchymal brain surgical resection cavities usually contract in volume following low dose rate (LDR) brachytherapy implants. In this study, we systematically modeled and assessed dose variability resulting from such changes for I-125 versus Cs-131 radioactive sources. Methods Resection cavity contraction was modeled based on 95 consecutive patient cases, using surveillance magnetic resonance (MR) images. The model was derived for single point source geometry and then fully simulated in 3D where I-125 or Cs-131 seeds were placed on the surface of an ellipsoidal resection cavity...
January 16, 2018: Curēus
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