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https://www.readbyqxmd.com/read/28441763/improving-passive-time-reversal-underwater-acoustic-communications-using-subarray-processing
#1
Chengbing He, Lianyou Jing, Rui Xi, Qinyuan Li, Qunfei Zhang
Multichannel receivers are usually employed in high-rate underwater acoustic communication to achieve spatial diversity. In the context of multichannel underwater acoustic communications, passive time reversal (TR) combined with a single-channel adaptive decision feedback equalizer (TR-DFE) is a low-complexity solution to achieve both spatial and temporal focusing. In this paper, we present a novel receiver structure to combine passive time reversal with a low-order multichannel adaptive decision feedback equalizer (TR-MC-DFE) to improve the performance of the conventional TR-DFE...
April 24, 2017: Sensors
https://www.readbyqxmd.com/read/28441747/associations-between-diet-and-toenail-arsenic-concentration-among-pregnant-women-in-bangladesh-a-prospective-study
#2
Pi-I D Lin, Sabri Bromage, Md Golam Mostofa, Joseph Allen, Emily Oken, Molly L Kile, David C Christiani
This prospective study evaluated the relationship between long-term dietary habits and total arsenic (As) concentration in toenail clippings in a cohort of 1616 pregnant women in the Bangladeshi administrative regions of Sirajdikhan and Pabna Sadar. Diet was assessed at Gestation Week 28 and at Postpartum Month 1, using a locally-validated dish-based semi-quantitative food-frequency questionnaire. Toenail As concentration was analyzed by microwave-assisted acid digestion and inductively coupled plasma mass spectrometry...
April 23, 2017: Nutrients
https://www.readbyqxmd.com/read/28441637/subtle-pathological-changes-in-neocortical-temporal-lobe-epilepsy
#3
Juan G Ochoa, Diana Hentgarden, Audrey Paulzak, Melissa Ogden, Richard Pryson, Markus Lamle, Walter G Rusyniak
This was a prospective observational study to correlate the clinical symptoms, electrophysiology, imaging, and surgical pathology of patients with temporal lobe epilepsy (TLE) without hippocampal sclerosis. We selected consecutive patients with TLE and normal MRI undergoing temporal lobe resection between April and September 2015. Clinical features, imaging, and functional data were reviewed. Intracranial monitoring and language mapping were performed when it was required according to our team recommendation...
April 22, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28441631/up-regulated-baff-and-baff-receptor-expression-in-patients-with-intractable-temporal-lobe-epilepsy-and-a-pilocarpine-induced-epilepsy-rat-model
#4
Limin Ma, Ruohan Li, Hao Huang, Jinxian Yuan, Shu Ou, Tao Xu, Xinyuan Yu, Xi Liu, Yangmei Chen
PURPOSE: Some studies have suggested that BAFF and BAFFR are highly expressed in the central nervous system (CNS) and participate in inflammatory and immune associated diseases. However, whether BAFF and BAFFR are involved in the pathogenesis of epilepsy remains unknown. This study aimed to investigate the expression of BAFF and BAFFR proteins in the brains of patients with temporal lobe epilepsy (TLE) and in a pilocarpine-induced rat model of TLE to identify possible roles of the BAFF-BAFFR signaling pathway in epileptogenesis...
April 8, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28441420/mapping-of-the-brain-hemodynamic-responses-to-sensorimotor-stimulation-in-a-rodent-model-a-bold-fmri-study
#5
Salem Boussida, Amidou S Traoré, Franck Durif
Blood Oxygenation Level Dependent functional MRI (BOLD fMRI) during electrical paw stimulation has been widely used in studies aimed at the understanding of the somatosensory network in rats. However, despite the well-established anatomical connections between cortical and subcortical structures of the sensorimotor system, most of these functional studies have been concentrated on the cortical effects of sensory electrical stimulation. BOLD fMRI study of the integration of a sensorimotor input across the sensorimotor network requires an appropriate methodology to elicit functional activation in cortical and subcortical areas owing to the regional differences in both neuronal and vascular architectures between these brain regions...
2017: PloS One
https://www.readbyqxmd.com/read/28441399/ghgs-and-air-pollutants-embodied-in-china-s-international-trade-temporal-and-spatial-index-decomposition-analysis
#6
Zhengyan Liu, Xianqiang Mao, Peng Song
Temporal index decomposition analysis and spatial index decomposition analysis were applied to understand the driving forces of the emissions embodied in China's exports and net exports during 2002-2011, respectively. The accumulated emissions embodied in exports accounted for approximately 30% of the total emissions in China; although the contribution of the sectoral total emissions intensity (technique effect) declined, the scale effect was largely responsible for the mounting emissions associated with export, and the composition effect played a largely insignificant role...
2017: PloS One
https://www.readbyqxmd.com/read/28441393/sequence-learning-modulates-neural-responses-and-oscillatory-coupling-in-human-and-monkey-auditory-cortex
#7
Yukiko Kikuchi, Adam Attaheri, Benjamin Wilson, Ariane E Rhone, Kirill V Nourski, Phillip E Gander, Christopher K Kovach, Hiroto Kawasaki, Timothy D Griffiths, Matthew A Howard, Christopher I Petkov
Learning complex ordering relationships between sensory events in a sequence is fundamental for animal perception and human communication. While it is known that rhythmic sensory events can entrain brain oscillations at different frequencies, how learning and prior experience with sequencing relationships affect neocortical oscillations and neuronal responses is poorly understood. We used an implicit sequence learning paradigm (an "artificial grammar") in which humans and monkeys were exposed to sequences of nonsense words with regularities in the ordering relationships between the words...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28441369/cardiac-magnetic-resonance-imaging-in-oncology
#8
Daniel Jeong, Aarti Patel, Christopher J Francois, Kenneth L Gage, Michael G Fradley
BACKGROUND: Cardiac magnetic resonance imaging (MRI) is emerging as an important diagnostic modality in the management of cardiovascular-related dysfunction in oncological diseases. Advances in imaging techniques have enhanced the detection and evaluation of cardiac masses; meanwhile, innovative applications have created a growing role for cardiac MRI for the management of cardiotoxicity caused by cancer therapies. METHODS: An overview is provided of the clinical indications and technical considerations of cardiac MRI...
April 2017: Cancer Control: Journal of the Moffitt Cancer Center
https://www.readbyqxmd.com/read/28441307/90-day-readmission-after-lumbar-spinal-fusion-surgery-in-new-york-state-between-2005-and-2014-a-10-year-analysis-of-a-statewide-cohort
#9
Ali A Baaj, Gernot Lang, Wei-Chun Hsu, Mauricio J Avila, Jialin Mao, Art Sedrakyan
STUDY DESIGN: Retrospective cohort study. OBJECTIVE: To assess 90-day readmission and evaluate risk factors associated with readmission after lumbar fusion in New York State. SUMMARY OF BACKGROUND DATA: Readmission is becoming an important metric for quality and efficiency of healthcare. Readmission and its predictors following spine surgery are overall poorly understood and limited evidence is available specifically in lumbar fusion. METHODS: The New York Statewide Planning and Research Cooperative System (SPACRS) was utilized to capture patients undergoing lumbar fusion from 2005-2014...
April 24, 2017: Spine
https://www.readbyqxmd.com/read/28441288/investigation-of-optically-stimulated-luminescence-and-signal-fading-properties-of-several-materials
#10
W Geoffrey West, Kimberlee J Kearfott, Chun Yong Seow
Optically stimulated luminescence (OSL) dosimetry involves the illumination of an irradiated sample on an appropriate material to produce a stimulated emission of light, whose intensity is indicative of the radiation dose. This technique is currently used for personnel dosimetry, environmental dosimetry, and geological dating applications. While a great deal of published research focusing on α-Al2O3:C and natural materials used for geological dating exist, relatively little is known about the OSL properties of thermoluminescent (TL) materials...
June 2017: Health Physics
https://www.readbyqxmd.com/read/28441229/preliminary-model-for-the-design-of-a-custom-middle-ear-prosthesis
#11
Brandon Kamrava, Jonathan A Gerstenhaber, Mamta Amin, Yah-El Har-El, Pamela C Roehm
HYPOTHESIS: Custom prostheses could be used to recreate the ossicular chain and improve hearing. BACKGROUND: Ossicular discontinuity or fixation occurs in 55% of cases of conductive hearing loss, with most cases involving the incus. Reconstruction has been achieved by a variety of methods; however, there has been little improvement in hearing outcomes in decades. METHODS: Precise measurements of anatomic dimensions, weight, and center of gravity were taken from 19 cadaveric incudes...
April 24, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28441142/magnetization-dynamics-in-magnonic-structures-with-different-geometries-interfaces-notches-and-waveguides
#12
M Mansurova, J von der Haar, J Panke, Jakob Walowski, Henning Ulrichs, M Münzenberg
The discovery of ultrafast magnetization dynamics 20 years ago has led to a broad variety of experimental techniques to explore phenomena in magnetic materials with high temporal resolution. In the current article we present a study dealing with broadband excitation of spin-wave packets at different magnonic crystal continuous magnetic film interfaces. Similar to protected conducting states on the surfaces of topological band insulators, these interfaces exhibit surface spin-wave modes that propagate out of the crystal into the continuous film...
April 25, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28440932/microplastics-in-a-freshwater-environment-receiving-treated-wastewater-effluent
#13
Steven Lasee, Jessica Mauricio, William A Thompson, Adcharee Karnjanapiboonwong, John Kasumba, Seenivasan Subbiah, Audra N Morse, Todd A Anderson
Small plastic fragments (microplastics or solid particles <5 mm in size or "microbeads" used in personal care products and cosmetics) may ultimately find their way into aquatic environments. We studied the presence of microplastics (particle sizes 53-105 μm and 106-179 μm) spatially and temporally in 3 connected urban lakes being fed by treated wastewater effluent in Lubbock, Texas. These lakes also serve as drainage during storm events. Water samples from drainage playa wetlands within the city were also collected...
May 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28440931/microplastics-as-vectors-for-environmental-contaminants-exploring-sorption-desorption-and-transfer-to-biota
#14
Nanna B Hartmann, Sinja Rist, Julia Bodin, Louise Hs Jensen, Stine N Schmidt, Philipp Mayer, Anders Meibom, Anders Baun
The occurrence and effects of microplastics (MPs) in the aquatic environment are receiving increasing attention. In addition to their possible direct adverse effects on biota, the potential role of MPs as vectors for hydrophobic organic chemicals (HOCs), compared to natural pathways, is a topic of much debate. It is evident, however, that temporal and spatial variations of MP occurrence do (and will) occur. To further improve the estimations of the role of MPs as vectors for HOC transfer into biota under varying MP concentrations and environmental conditions, it is important to identify and understand the governing processes...
May 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28440928/microplastics-as-contaminants-in-commercially-important-seafood-species
#15
David Santillo, Kathryn Miller, Paul Johnston
The ingestion of microplastic fragments, spheres, and fibers by marine mollusks, crustaceans, and fish, including a number of commercially important species, appears to be a widespread and pervasive phenomenon. Evidence is also growing for direct impacts of microplastic ingestion on physiology, reproductive success and survival of exposed marine organisms, and transfer through food webs, although the ecological implications are not yet known. Concerns also remain over the capacity for microplastics to act as vectors for harmful chemical pollutants, including plastic additives and persistent organic pollutants, although their contribution must be evaluated alongside other known sources...
May 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28440860/doppler-ultrasonographic-measurement-of-short-term-effects-of-valsalva-maneuver-on-retrobulbar-blood-flow
#16
Sabit Kimyon, Ahmet Mete, Alper Mete, Duçem Mete
BACKGROUND: To investigate the effects of Valsalva maneuver (VM) on retrobulbar blood flow parameters in healthy subjects. METHODS: Participants without any ophthalmologic or systemic pathology were examined in supine position with color and pulsed Doppler imaging for blood flow measurement, via a paraocular approach, in the ophthalmic artery (OA), central retinal artery (CRA), central retinal vein (CRV), nasal posterior ciliary artery (NPCA), and temporal posterior ciliary artery (TPCA), 10 seconds after a 35- to 40-mm Hg expiratory pressure was reached...
April 25, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28440644/direct-observation-of-the-ultrafast-evolution-of-open-shell-biradical-in-photochromic-radical-dimer
#17
Yoichi Kobayashi, Hajime Okajima, Hikaru Sotome, Takeshi Yanai, Katsuya Mutoh, Yusuke Yoneda, Yasuteru Shigeta, Akira Sakamoto, Hiroshi Miyasaka, Jiro Abe
Delocalized biradicals have been extensively studied because of fundamental interests to singlet biradicals and several potential applications such as to two-photon absorption materials. However, many of the biradical studies only focus on the static properties of the rigid molecular structures. It is expected that the biradical properties of the delocalized biradicals are sensitive to the subtle changes of the molecular structures and their local environments. Therefore, the studies of the dynamic properties of the system will give further insight into stable radical chemistry...
April 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28440628/edaphic-conditions-regulate-denitrification-directly-and-indirectly-by-altering-denitrifier-abundance-in-wetlands-along-the-han-river-china
#18
Ziqian Xiong, Laodong Guo, Quanfa Zhang, Guihua Liu, Wenzhi Liu
Riparian wetlands play a critical role in retaining nitrogen (N) from upland runoff and improving river water quality, mainly through biological processes such as soil denitrification. However, the relative contribution of abiotic and biotic factors to riparian denitrification capacity remains elusive. Here we report the spatio-temporal dynamics of potential and unamended soil denitrification rates in 20 wetlands along the Han River, an important water source in central China. We also quantified the abundance of soil denitrifying microorganisms using nirK and nirS genes...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28440551/alternating-ph-landscapes-shape-epithelial-cancer-initiation-and-progression-focus-on-pancreatic-cancer
#19
REVIEW
Stine F Pedersen, Ivana Novak, Frauke Alves, Albrecht Schwab, Luis A Pardo
We present here the hypothesis that the unique microenvironmental pH landscape of acid-base transporting epithelia is an important factor in development of epithelial cancers, by rendering the epithelial and stromal cells pre-adapted to the heterogeneous extracellular pH (pHe ) in the tumor microenvironment. Cells residing in organs with net acid-base transporting epithelia such as the pancreatic ductal and gastric epithelia are exposed to very different, temporally highly variable pHe values apically and basolaterally...
April 25, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28440446/temporal-and-spatial-changes-of-monocarboxylate-transporter-4-expression-in-the-hippocampal-ca1-region-following-transient-forebrain-ischemia-in-the-mongolian-gerbil
#20
Dae Young Yoo, Joon Ha Park, Kwon Young Lee, Hyun Jung Kwon, Hyo Young Jung, Jong Whi Kim, Dae Won Kim, Jung Hoon Choi, Seung Myung Moon, Yeo Sung Yoon, Moo-Ho Won, In Koo Hwang
Transient forebrain ischemia depletes glucose and oxygen levels in the brain. In this pathological condition, lactate serves an important role in cellular metabolism as the end product of glycolysis. The present study investigated the expression of monocarboxylate transporter 4 (MCT4) in lactate metabolism in the hippocampal CA1 region following induction of transient forebrain ischemia. MCT4 immunoreactivity was detected in CA1 pyramidal cells of the sham-operated group. Animals from the ischemic group exhibited a transient decrease in MCT4 immunoreactivity in the CA1 region between 30 min and 3 h following ischemia compared with the sham‑operated group...
April 25, 2017: Molecular Medicine Reports
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