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https://www.readbyqxmd.com/read/28333777/arteriovenous-lesions-of-the-internal-auditory-canal
#1
Charles L Anzalone, John I Lane, Michael J Link, Matthew L Carlson
OBJECTIVE: To describe a unique case of an asymptomatic arteriovenous lesion of the internal auditory canal (IAC) and present the associated imaging findings. METHODS: Retrospective case report and review of the literature. RESULTS: A 55-year-old man presented for further evaluation of a left-sided sudden sensorineural hearing loss that occurred 8 years earlier. Careful review of outside serial magnetic resonance (MR) imaging revealed a contralateral, ill-defined right-sided IAC mass with low T2 signal and subtle peripheral enhancement on postcontrast T1-weighted sequencing...
March 22, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28322876/predator-prey-subsidy-population-dynamics-on-stepping-stone-domains
#2
Lulan Shen, Robert A Van Gorder
Predator-prey-subsidy dynamics on stepping-stone domains are examined using a variety of network configurations. Our problem is motivated by the interactions between arctic foxes (predator) and lemmings (prey) in the presence of seal carrion (subsidy) provided by polar bears. We use the n-Patch Model, which considers space explicitly as a "Stepping Stone" system. We consider the role that the carrying capacity, predator migration rate, input subsidy rate, predator mortality rate, and proportion of predators surviving migration play in the predator-prey-subsidy population dynamics...
March 16, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28319451/a-best-example-of-channel-structure-annotation-by-molecular-simulation
#3
Shanlin Rao, Gianni Klesse, Phillip J Stansfeld, Stephen J Tucker, Mark S P Sansom
An increasing number of ion channel structures are being determined. This generates a need for computational tools to enable functional annotation of channel structures. However, a number of studies of ion channel and model pores have indicated that the physical dimensions of a pore are not always a reliable indicator of its conductive status. This is due to the unusual behavior of water within nano-confined spaces, resulting in a phenomenon referred to as 'hydrophobic gating'. We have recently demonstrated how simulating the behavior of water within an ion channel pore can be used to predict its conductive status...
March 20, 2017: Channels
https://www.readbyqxmd.com/read/28319391/synthesis-isotopic-enrichment-and-solid-state-nmr-characterization-of-zeolites-derived-from-the-assembly-disassembly-organisation-reassembly-process
#4
Giulia P M Bignami, Daniel M Dawson, Valerie R Seymour, Paul S Wheatley, Russell Edward Morris, Sharon E Ashbrook
The great utility and importance of zeolites in fields as diverse as industrial catalysis and medicine has driven considerable interest in the ability to target new framework types with novel properties and applications. The recently-introduced and unconventional Assembly, Disassembly, Organization, Reassembly (ADOR) method represents one exciting new approach to obtain solids with targeted structures by selectively disassembling pre-prepared hydrolytically-unstable frameworks, and then reassembling the resulting products to form materials with new topologies...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28317564/odontogenic-infections
#5
REVIEW
Orrett E Ogle
The pathogenesis of odontogenic infection is polymicrobial, consisting of various facultative and strict anaerobes. The dominant isolates are strictly anaerobic gram-negative rods and gram-positive cocci. The periapical infection is the most common form of odontogenic infection. Although odontogenic infections are usually confined to the alveolar ridge vicinity, they can spread into deep fascial spaces. Cavernous sinus thrombosis, brain abscess, airway obstruction, and mediastinitis are possible complications of dental infections...
April 2017: Dental Clinics of North America
https://www.readbyqxmd.com/read/28301702/space-for-the-prisoner-s-point-of-view
#6
Laura Haupt
The lead article in this issue discusses a potentially free metaphorical space-that of decision-making-within the confines, tangible and intangible, of life in jail or prison. By interviewing prisoner-participants from six clinical studies, Paul Christopher and colleagues sought to find out how these men and women would answer open-ended questions about their decision to enroll in the research. What the interviewers heard was that none saw themselves as having been inappropriately pressured to do so. In fact, a significant percentage of the prisoners described being dissuaded from participating in the studies...
March 2017: Hastings Center Report
https://www.readbyqxmd.com/read/28295055/dynamics-of-a-single-atom-electron-pump
#7
J van der Heijden, G C Tettamanzi, S Rogge
Single-electron pumps based on isolated impurity atoms have recently been experimentally demonstrated. In these devices the Coulomb potential of an atom creates a localised electron state with a large charging energy and considerable orbital level spacings, enabling robust charge capturing processes. In contrast to the frequently used gate-defined quantum dot pumps, which experience a strongly time-dependent potential, the confinement potential in these single-atom pumps is hardly affected by the periodic driving of the system...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28294193/characteristics-of-ferroelectric-ferroelastic-domains-in-n%C3%A3-el-type-skyrmion-host-gav4s8
#8
Ádám Butykai, Sándor Bordács, István Kézsmárki, Vladimir Tsurkan, Alois Loidl, Jonathan Döring, Erik Neuber, Peter Milde, Susanne C Kehr, Lukas M Eng
GaV4S8 is a multiferroic semiconductor hosting Néel-type magnetic skyrmions dressed with electric polarization. At Ts = 42 K, the compound undergoes a structural phase transition of weakly first-order, from a non-centrosymmetric cubic phase at high temperatures to a polar rhombohedral structure at low temperatures. Below Ts, ferroelectric domains are formed with the electric polarization pointing along any of the four 〈111〉 axes. Although in this material the size and the shape of the ferroelectric-ferroelastic domains may act as important limiting factors in the formation of the Néel-type skyrmion lattice emerging below TC = 13 K, the characteristics of polar domains in GaV4S8 have not been studied yet...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282941/conservation-of-the-keap1-nrf2-system-an-evolutionary-journey-through-stressful-space-and-time
#9
REVIEW
Yuji Fuse, Makoto Kobayashi
The Keap1-Nrf2 system is an evolutionarily conserved defense mechanism against oxidative and xenobiotic stress. Its regulatory mechanisms, e.g., stress-sensing mechanism, proteasome-based regulation of Nrf2 activity and selection of target genes, have been elucidated mainly in mammals. In addition, emerging model animals, such as zebrafish, fruit fly and Caenorhabditis elegans, have been shown to have similar anti-stress systems to mammals, suggesting that analogous defense systems are widely conserved throughout the animal kingdom...
March 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28281553/ctnnb1-beta-catenin-mutation-identifies-low-grade-early-stage-endometrial-cancer-patients-at-increased-risk-of-recurrence
#10
Katherine C Kurnit, Grace N Kim, Bryan M Fellman, Diana L Urbauer, Gordon B Mills, Wei Zhang, Russell R Broaddus
Although the majority of low grade, early stage endometrial cancer patients will have good survival outcomes with surgery alone, those patients who do recur tend to do poorly. Optimal identification of the subset of patients who are at high risk of recurrence and would benefit from adjuvant treatment has been difficult. The purpose of this study was to evaluate the impact of somatic tumor mutation on survival outcomes in this patient population. For this study, low grade was defined as endometrioid FIGO grades 1 or 2, while early stage was defined as endometrioid stages I or II (disease confined to the uterus)...
March 10, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28281347/two-dimensional-mxene-with-controlled-interlayer-spacing-for-electrochemical-energy-storage
#11
Patrice Simon
In this issue of ACS Nano, Luo et al. report the preparation of pillared two-dimensional (2D) Ti3C2 MXenes with controllable interlayer spacings between 1 and 2.708 nm. These materials were further intercalated by ion exchange with Sn(+IV) ions. The results show improved electrochemical performance due to improved ion accessibility into the 2D structure as well as the confinement effect, which limits volume expansion during the Li-alloying reaction. Beyond this specific example, the demonstration that the interlayer spacings of MXenes can be fine-tuned by creating pillared structures based on the spontaneous intercalation of surfactants opens new perspectives in the field of electrochemical energy storage...
March 10, 2017: ACS Nano
https://www.readbyqxmd.com/read/28279266/parallels-between-astronauts-and-terrestrial-patients-taking-physiotherapy-rehabilitation-to-infinity-and-beyond
#12
Julie Hides, Gunda Lambrecht, Gita Ramdharry, Rebecca Cusack, Jacob Bloomberg, Maria Stokes
Exposure to the microgravity environment induces physiological changes in the cardiovascular, musculoskeletal and sensorimotor systems in healthy astronauts. As space agencies prepare for extended duration missions, it is difficult to predict the extent of the effects that prolonged exposure to microgravity will have on astronauts. Prolonged bed rest is a model used by space agencies to simulate the effects of spaceflight on the human body, and bed rest studies have provided some insights into the effects of immobilisation and inactivity...
January 2017: Musculoskelet Sci Pract
https://www.readbyqxmd.com/read/28277650/emergence-of-hemicryptophanes-from-synthesis-to-applications-for-recognition-molecular-machines-and-supramolecular-catalysis
#13
Dawei Zhang, Alexandre Martinez, Jean-Pierre Dutasta
In the wide area of host-guest chemistry, hemicryptophanes, combining a cyclotribenzylene (or cyclotriveratrylene CTV) unit with another different C3-symmetrical moiety, appears as a recent family of molecular cages. The synthesis and recognition properties of the first hemicryptophane were reported in 1982 by Collet and Lehn, but the very little attention received by this class of host compounds in the 20 years following this first promising result can account for their apparent novelty. Indeed, in the last 10 years hemicryptophanes have aroused growing interest, and new aspects have been developed...
March 9, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28276886/design-of-a-gis-based-rating-protocol-to-assess-the-potential-for-landfill-closure-using-dredge-material-in-post-hurricane-sandy-new-jersey
#14
Robert J Miskewitz, Daniel Barone, Sar J Guterl, Christopher G Uchrin
New Jersey is rapidly running out of capacity for storage of dredged material. A potential solution to this lack of storage space is to remove and reuse the dredged material for some beneficial use. Results from a Rutgers University project performed for the New Jersey Department of Transportation, Office of Maritime Resources, designed to assess the potential for closure of New Jersey landfills using dredge material from existing Confined Disposal Facilities (CDFs) are presented and discussed. The project included an update of the existing NJDEP landfill database, the development of a rating system to identify landfills with the highest potential to utilize dredged material for their closure, and the identification and preliminary investigation of the top candidate landfills based on this rating system...
February 22, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28275498/pulmonary-cryptococcosis-manifesting-as-diffuse-air-space-consolidations-in-an-immunocompetent-patient
#15
Hye Won Choi, Semin Chong, Mi Kyung Kim, In Won Park
Pulmonary cryptococcosis is an opportunity infection commonly occurred in the immunocompromised patients. However pulmonary cryptococcosis in the immunocompetent was reported up to 35% and these cases tend to show confined and localized radiologic findings than in immunocompromised patients. To our knowledge, extensive air-space consolidations have not frequently occurred in the immunocompetent patient. Therefore, in this case, we report a rare case of a 73-year-old woman who was diagnosed with pulmonary cryptococcosis, manifesting as diffuse air-space consolidations even though normal immune status...
February 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28272870/enhanced-thermal-decomposition-properties-of-cl-20-through-space-confining-in-three-dimensional-hierarchically-ordered-porous-carbon
#16
Jin Chen, Simin He, Bing Huang, Peng Wu, Zhiqiang Qiao, Jun Wang, Liyuan Zhang, Guangcheng Yang, Hui Huang
High energy and low signature properties are the future trend of solid propellant development. As a new and promising oxidizer, hexanitrohexaazaisowurtzitane (CL-20) is expected to replace the conventional oxidizer ammonium perchlorate to reach above goals. However, the high pressure exponent of CL-20 hinders its application in solid propellants so that the development of effective catalysts to improve the thermal decomposition properties of CL-20 still remains challenging. Here, 3D hierarchically ordered porous carbon (3D HOPC) is presented as a catalyst for the thermal decomposition of CL-20 via synthesizing a series of nanostructured CL-20/HOPC composites...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28272337/impact-of-isotonic-beverage-on-the-hydration-status-of-healthy-chinese-adults-in-air-conditioned-environment
#17
Phei Ching Siow, Wei Shuan Kimberly Tan, Christiani Jeyakumar Henry
People living in tropical climates spend much of their time in confined air-conditioned spaces, performing normal daily activities. This study investigated the effect of distilled water (W) or isotonic beverage (IB) on the hydration status in subjects living under these conditions. In a randomized crossover design, forty-nine healthy male subjects either consumed beverage or IB over a period of 8 h (8 h) in a controlled air-conditioned environment. Blood, urine, and saliva samples were collected at baseline and after 8 h...
March 7, 2017: Nutrients
https://www.readbyqxmd.com/read/28271409/the-effect-of-spaceflight-and-microgravity-on-the-human-brain
#18
Angelique Van Ombergen, Athena Demertzi, Elena Tomilovskaya, Ben Jeurissen, Jan Sijbers, Inessa B Kozlovskaya, Paul M Parizel, Paul H Van de Heyning, Stefan Sunaert, Steven Laureys, Floris L Wuyts
Microgravity, confinement, isolation, and immobilization are just some of the features astronauts have to cope with during space missions. Consequently, long-duration space travel can have detrimental effects on human physiology. Although research has focused on the cardiovascular and musculoskeletal system in particular, the exact impact of spaceflight on the human central nervous system remains to be determined. Previous studies have reported psychological problems, cephalic fluid shifts, neurovestibular problems, and cognitive alterations, but there is paucity in the knowledge of the underlying neural substrates...
March 7, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28267170/photocatalytic-h2-production-using-a-hybrid-assembly-of-an-fefe-hydrogenase-model-and-cdse-quantum-dot-linked-through-a-thiolato-functionalized-cyclodextrin
#19
Minglun Cheng, Mei Wang, Shuai Zhang, Fengyuan Liu, Yong Yang, Boshun Wan, Licheng Sun
It is a great challenge to develop iron-based highly-efficient and durable catalytic systems for the hydrogen evolution reaction (HER) by understanding and learning from [FeFe]-hydrogenases. Here we report photocatalytic H2 production by a hybrid assembly of a sulfonate-functionalized [FeFe]-hydrogenase mimic (1) and CdSe quantum dot (QD), which is denoted as 1/β-CD-6-S-CdSe (β-CD-6-SH = 6-mercapto-β-cyclodextrin). In this assembly, thiolato-functionalized β-CD acts not only as a stabilizing reagent of CdSe QDs but also as a host compound for the diiron catalyst, so as to confine CdSe QDs to the space near the site of diiron catalyst...
March 7, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28266855/the-effect-of-confined-hindrance-in-polyphenylbenzenes
#20
Carlos F R A C Lima, Ana S M C Rodrigues, Luis M N B F Santos
A comprehensive thermodynamic study of the whole ortho-polyphenylbenzenes series, from biphenyl (n=1) to hexaphenylbenzene (n=6), is presented. Combustion calorimetry and phase equilibria measurements for 1,2,3,4-tetraphenylbenzene (n=4) and pentaphenylbenzene (n=5), together with literature data, were used to understand and quantify the constraint effect of ortho- substitution on the molecular energetics and phase stability of polyaromatic compounds. All the derived thermodynamic properties (enthalpy of sublimation, entropy of sublimation, and gas phase molecular energetics) show a marked trend shift at n=4 to n=5, which is related with the change of the degree of molecular flexibility after 1,2,3,4-tetraphenylbenzene (n=4)...
March 7, 2017: Journal of Physical Chemistry. A
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