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https://www.readbyqxmd.com/read/29149758/oligotrophy-as-a-major-driver-of-mercury-bioaccumulation-in-medium-to-high-trophic-level-consumers-a-marine-ecosystem-comparative-study
#1
Tiphaine Chouvelon, Pierre Cresson, Marc Bouchoucha, Christophe Brach-Papa, Paco Bustamante, Sylvette Crochet, Françoise Marco-Miralles, Bastien Thomas, Joël Knoery
Mercury (Hg) is a global contaminant of environmental concern. Numerous factors influencing its bioaccumulation in marine organisms have already been described at both individual and species levels (e.g., size or age, habitat, trophic level). However, few studies have compared the trophic characteristics of ecosystems to explain underlying mechanisms of differences in Hg bioaccumulation and biomagnification among food webs and systems. The present study aimed at investigating the potential primary role of the trophic status of systems on Hg bioaccumulation and biomagnification in temperate marine food webs, as shown by their medium-to high-trophic level consumers...
November 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29133931/design-of-dual-band-cold-mirrors
#2
Xiaodong Wang, Bo Chen
Dual-band cold mirrors are designed based on third-order of 121.6 nm multilayers, and they are only composed of LaF3 and MgF2. The designed mirrors have a high reflectance at 121.6 nm and 280 nm, and a low reflectance in visible waveband; they also have a narrow bandwidth of 4 nm at 121.6 nm, and low sidelobe ripples of two stopbands. A broadband antireflection coating and an asymmetrically Gaussian-apodization of thickness-modulated design method are proposed to eliminate sidelobe ripples of the reflection zone...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29122936/reply-to-kalinkat-et-al-smallest-terrestrial-vertebrates-are-highly-imperiled
#3
William J Ripple, Christopher Wolf, Thomas M Newsome, Michael Hoffmann, Aaron J Wirsing, Douglas J McCauley
No abstract text is available yet for this article.
November 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29122445/a-method-for-the-topographical-identification-and-quantification-of-high-frequency-oscillations-in-intracranial-electroencephalography-recordings
#4
Zachary J Waldman, Shoichi Shimamoto, Inkyung Song, Iren Orosz, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop a reliable software method using a topographic analysis of time-frequency plots to distinguish ripple (80-200 Hz) oscillations that are often associated with EEG sharp waves or spikes (RonS) from sinusoid-like waveforms that appear as ripples but correspond with digital filtering of sharp transients contained in the wide bandwidth EEG. METHODS: A custom algorithm distinguished true from false ripples in one second intracranial EEG (iEEG) recordings using wavelet convolution, identifying contours of isopower, and categorizing these contours into sets of open or closed loop groups...
October 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29113719/utilization-of-independent-component-analysis-for-accurate-pathological-ripple-detection-in-intracranial-eeg-recordings-recorded-extra-and-intra-operatively
#5
Shoichi Shimamoto, Zachary J Waldman, Iren Orosz, Inkyung Song, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Ashwini Sharan, Chengyuan Wu, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop and validate a detector that identifies ripple (80-200 Hz) events in intracranial EEG (iEEG) recordings in a referential montage and utilizes independent component analysis (ICA) to eliminate or reduce high-frequency artifact contamination. Also, investigate the correspondence of detected ripples and the seizure onset zone (SOZ). METHODS: iEEG recordings from 16 patients were first band-pass filtered (80-600 Hz) and Infomax ICA was next applied to derive the first independent component (IC1)...
October 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29112636/disseminated-peritoneal-leiomyomatosis
#6
Brandon J Bachert, Ripple S Patel
No abstract text is available yet for this article.
November 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/29099662/local-oxygen-homeostasis-during-various-neuronal-network-activity-states-in-the-mouse-hippocampus
#7
Justus Schneider, Nikolaus Berndt, Ismini E Papageorgiou, Jana Maurer, Sascha Bulik, Martin Both, Andreas Draguhn, Hermann-Georg Holzhütter, Oliver Kann
Cortical information processing comprises various activity states emerging from timed synaptic excitation and inhibition. However, the underlying energy metabolism is widely unknown. We determined the cerebral metabolic rate of oxygen (CMRO2) along a tissue depth of <0.3 mm in the hippocampal CA3 region during various network activities, including gamma oscillations and sharp wave-ripples that occur during wakefulness and sleep. These physiological states associate with sensory perception and memory formation, and critically depend on perisomatic GABA inhibition...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29089440/hippocampal-prefrontal-reactivation-during-learning-is-stronger-in-awake-as-compared-to-sleep-states
#8
Wenbo Tang, Justin D Shin, Loren M Frank, Shantanu P Jadhav
Hippocampal sharp-wave ripple (SWR) events occur during both behavior (awake SWRs) and slow-wave sleep (sleep SWRs). Awake and sleep SWRs both contribute to spatial learning and memory, thought to be mediated by the coordinated reactivation of behavioral experiences in hippocampal-cortical circuits seen during SWRs. Current hypotheses suggest that reactivation contributes to memory consolidation processes, but whether awake and sleep reactivation are suited to play similar or different roles remains unclear...
October 31, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29081385/toward-multimodal-signal-detection-of-adverse-drug-reactions
#9
Rave Harpaz, William DuMouchel, Martijn Schuemie, Olivier Bodenreider, Carol Friedman, Eric Horvitz, Anna Ripple, Alfred Sorbello, Ryen W White, Rainer Winnenburg, Nigam H Shah
OBJECTIVE: Improving mechanisms to detect adverse drug reactions (ADRs) is key to strengthening post-marketing drug safety surveillance. Signal detection is presently unimodal, relying on a single information source. Multimodal signal detection is based on jointly analyzing multiple information sources. Building on, and expanding the work done in prior studies, the aim of the article is to further research on multimodal signal detection, explore its potential benefits, and propose methods for its construction and evaluation...
October 25, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/29076667/glutamine-augments-neuronal-network-activity-in-rat-hippocampal-slices
#10
Mujeeb Ur Rehman, Muhammad Mushtaq, Muhammad Azhar Sherkheli
BACKGROUND: In recent past, a huge number of in vitro electrophysiological techniques have been developed to explore underlying mechanisms of most complicated functions of brain. Neurophysiologist and neuroscientist use different compositions of artificial cerebrospinal fluid (aCSF) usually based on ionic and energy demands of neurons but these compositions lack amino acids such as aspartic acid, taurine and glutamine. METHODS: We used in vitro electrophysiological recording technique to estimate the effects of glutamine, an amino acid and precursor of neurotransmitters glutamate and GABA, on hippocampal sharp wave ripple activity (SPW-R) in rats...
July 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29069093/the-first-megatheropod-tracks-from-the-lower-jurassic-upper-elliot-formation-karoo-basin-lesotho
#11
L Sciscio, E M Bordy, M Abrahams, F Knoll, B W McPhee
A palaeosurface with one megatheropod trackway and several theropod tracks and trackways from the Lower Jurassic upper Elliot Formation (Stormberg Group, Karoo Supergroup) in western Lesotho is described. The majority of the theropod tracks are referable to either Eubrontes or Kayentapus based on their morphological characteristics. The larger megatheropod tracks are 57 cm long and have no Southern Hemisphere equivalent. Morphologically, they are more similar to the Early Jurassic Kayentapus, as well as the much younger Upper Cretaceous ichnogenus Irenesauripus, than to other contemporaneous ichnogenera in southern Africa...
2017: PloS One
https://www.readbyqxmd.com/read/29069009/oxygen-embolism-caused-by-accidental-subcutaneous-injection-of-hydrogen-peroxide-during-orthopedic-surgery-a-case-report
#12
Jinhun Chung, Minyoung Jeong
INTRODUCTION: We report a 39-year-old male patient with a fracture of the right acetabulum undergoing open reduction and internal fixation with a plate under general anesthesia. At closure, the surgeons injected 0.75% ropivacaine into the subcutaneous tissue of the incision wound for postoperative analgesia. Soon after injection, subcutaneous emphysema at the injection site and a sudden decrease in end-tidal CO2 tension with crude oscillatory ripples during the alveolar plateau phase were observed...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29068083/threats-to-biodiversity-from-cumulative-human-impacts-in-one-of-north-america-s-last-wildlife-frontiers
#13
Nancy Shackelford, Rachel J Standish, William Ripple, Brian M Starzomski
Land-use change is the largest proximate threat to biodiversity, yet remains one of the most complex to manage. In British Columbia (BC), where large mammals roam extensive tracts of intact habitat, continued land-use development is of global concern. Extant mammal diversity in BC is unrivalled in North America owing, in part, to its unique position at the intersection of alpine, boreal and temperate biomes. Despite high conservation values, understanding of cumulative ecological impacts from human development is limited...
October 25, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/29063112/-the-mechanism-and-function-of-hippocampal-neural-oscillation
#14
Ning Lu, Dan-Qin Xing, Tao Sheng, Wei Lu
Neural oscillation is rhythmic or repetitive neural activity in the central nervous system that is usually generated by oscillatory activity of neuronal ensembles, reflecting regular and synchronized activities within these cell populations. According to several oscillatory bands covering frequencies from approximately 0.5 Hz to >100 Hz, neural oscillations are usually classified as delta oscillation (0.5-3 Hz), theta oscillation (4-12 Hz), beta oscillation (12-30 Hz), gamma oscillation (30-100 Hz) and sharp-wave ripples (>100 Hz ripples superimposed on 0...
October 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/29062655/prepectoral-implant-based-breast-reconstruction
#15
Lyndsey Highton, Richard Johnson, Cliona Kirwan, John Murphy
BACKGROUND: The development of acellular dermal matrices (ADMs) has facilitated single-stage implant breast reconstruction (IBR) following skin-sparing mastectomy. The conventional approach of postpectoral implant placement with lower pole ADM confers a good cosmetic result by improving lower pole projection and control, while minimizing issues of implant visibility, palpability, and rippling. This is balanced with potential disadvantages including pain, disruption of pectoral muscle function, and animation...
September 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29062105/resection-of-high-frequency-oscillations-predicts-seizure-outcome-in-the-individual-patient
#16
Tommaso Fedele, Sergey Burnos, Ece Boran, Niklaus Krayenbühl, Peter Hilfiker, Thomas Grunwald, Johannes Sarnthein
High frequency oscillations (HFOs) are recognized as biomarkers for epileptogenic brain tissue. A remaining challenge for epilepsy surgery is the prospective classification of tissue sampled by individual electrode contacts. We analysed long-term invasive recordings of 20 consecutive patients who subsequently underwent epilepsy surgery. HFOs were defined prospectively by a previously validated, automated algorithm in the ripple (80-250 Hz) and the fast ripple (FR, 250-500 Hz) frequency band. Contacts with the highest rate of ripples co-occurring with FR over several five-minute time intervals designated the HFO area...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29061227/building-health-literacy-responsiveness-in-melbourne-s-west-a-systems-approach
#17
Mindy L Allott, Tanya Sofra, Gail O'Donnell, Jeremy L Hearne, Lucio Naccarella
With high health inequities among some population groups, health professionals and organisations are increasingly taking action on health literacy. This case study demonstrates how a systems approach to health literacy responsiveness created change across a region. From 2013 to 2017 the Health Literacy Development Project incorporating a training course and community of practice (the Project) targeted the health and community services system in Melbourne's west. The Project created a ripple effect that built health literacy responsiveness at the individual and organisational level...
October 24, 2017: Australian Health Review: a Publication of the Australian Hospital Association
https://www.readbyqxmd.com/read/29060261/fusing-motion-capture-and-inertial-measurements-for-improved-joint-state-recovery-an-application-for-sit-to-stand-actions
#18
Robert Peter Matthew, Sarah Seko, Ruzena Bajcsy
The estimate of joint angles, velocities, and accelerations is a key component of biomechanical modelling. The literature presents a variety of sensing modalities and algorithms to recover the full joint state, with tuning parameters varying between different applications, actions, and limbs. Comparisons between these methods are frequently limited to angles only, without comparison between the joint velocities and accelerations. This paper introduces an algorithm to fuse motion-capture and inertial measurements to recover the full state during a sit-to-stand task...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057265/take-home-trial-comparing-fast-fourier-transformation-based-and-filter-bank-based-cochlear-implant-speech-coding-strategies
#19
Monique A M de Jong, Jeroen J Briaire, Johan H M Frijns
Previous studies have demonstrated no improved or deteriorated speech intelligibility with the HiResolution Fidelity 120™ speech coding strategy (HiResF120) over the original HiRes strategy. Improved spectral and deteriorated temporal sensitivities have been shown, making it plausible that the beneficial effect in the spectral domain was offset by the worsened temporal sensitivity. We hypothesize that the implementation of fast Fourier transform (FFT) processing, instead of the traditionally used bandpass filters, explains the reduction of temporal sensitivity...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29051381/learning-enhanced-coupling-between-ripple-oscillations-in-association-cortices-and-hippocampus
#20
Dion Khodagholy, Jennifer N Gelinas, György Buzsáki
Consolidation of declarative memories requires hippocampal-neocortical communication. Although experimental evidence supports the role of sharp-wave ripples in transferring hippocampal information to the neocortex, the exact cortical destinations and the physiological mechanisms of such transfer are not known. We used a conducting polymer-based conformable microelectrode array (NeuroGrid) to record local field potentials and neural spiking across the dorsal cortical surface of the rat brain, combined with silicon probe recordings in the hippocampus, to identify candidate physiological patterns...
October 20, 2017: Science
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