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https://www.readbyqxmd.com/read/28808778/audiogram-of-the-mallard-duck-anas-platyrhynchos-from-16%C3%A2-hz-to-9%C3%A2-khz
#1
Evan M Hill
The pure-tone thresholds of three mallard ducks were determined from 16 Hz to 9 kHz. The purpose was to determine whether the mallard duck hears infrasound, which then may potentially be used for navigation, similar to how it is proposed that pigeons use it for homing. At a level of 60 dB sound pressure level (re 20 μN/m(2)), their hearing range extends 6.85 octaves from 66 Hz to 7.6 kHz, with a best sensitivity of 12.5 dB at 2 kHz. However, at no frequency, including the lowest tested, were the ducks' thresholds lower than those of humans...
August 14, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28799045/trauma-laparoscopy-when-to-start-and-when-to-convert
#2
Oleh Matsevych, Modise Koto, Moses Balabyeki, Colleen Aldous
BACKGROUND: The use of laparoscopy for stable patients with abdominal trauma is increasing and its accuracy is nearly 100%. However, indications for laparoscopy and for conversion differ among centers. The aim of this study was to investigate indications for trauma laparoscopy and for conversion to laparotomy. METHODS: All trauma patients managed with laparoscopy over a 4-year period were retrospectively analyzed. Indications for laparoscopy, morbidity, and reasons for conversion were investigated and predictors of morbidity and conversion were sought...
August 10, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28797612/decentralized-manufacturing-of-cell-and-gene-therapies-overcoming-challenges-and-identifying-opportunities
#3
REVIEW
Richard P Harrison, Steven Ruck, Nicholas Medcalf, Qasim A Rafiq
Decentralized or "redistributed" manufacturing has the potential to revolutionize the manufacturing approach for cell and gene therapies (CGTs), moving away from the "Fordist" paradigm, delivering health care locally, customized to the end user and, by its very nature, overcoming many of the challenges associated with manufacturing and distribution of high volume goods. In departing from the traditional centralized model of manufacturing, decentralized manufacturing divides production across sites or geographic regions...
August 7, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28782173/silent-navigator-triggered-silent-mri-of-the-abdomen
#4
Yuji Iwadate, Atsushi Nozaki, Yoshinobu Nunokawa, Shigeo Okuda, Masahiro Jinzaki, Hiroyuki Kabasawa
PURPOSE: To develop and demonstrate the feasibility of a silent respiratory navigator technique for prospective triggering, which was incorporated into a three-dimensional radial zero-echo-time sequence for respiratory navigated silent abdominal imaging. METHODS: A nonselective hard excitation radiofrequency pulse was used for the navigator sequence with a derated readout gradient, to avoid generation of high levels of acoustic noise. The acquired navigator signals were processed in real time and used for prospective triggering of the zero-echo-time sequence...
August 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28774084/acoustic-behavior-of-hollow-blocks-and-bricks-made-of-concrete-doped-with-waste-tire-rubber
#5
Esteban Fraile-Garcia, Javier Ferreiro-Cabello, Beatriz Defez, Guillermo Peris-Fajanes
In this paper, we investigate the acoustic behaviour of building elements made of concrete doped with waste-tire rubber. Three different mixtures were created, with 0%, 10%, and 20% rubber in their composition. Bricks, lattice joists, and hollow blocks were manufactured with each mixture, and three different cells were built and tested against aerial and impact noise. The values of the global acoustic isolation and the reduction of the sound pressure level of impacts were measured. Results proved that highly doped elements are an excellent option to isolate low frequency sounds, whereas intermediate and standard elements constitute a most interesting option to block middle and high frequency sounds...
November 26, 2016: Materials
https://www.readbyqxmd.com/read/28768266/aerodynamic-and-laryngeal-characteristics-of-place-dependent-voice-onset-time-differences
#6
Marziye Eshghi, Mehdi Alemi, David J Zajac
OBJECTIVE: To investigate aerodynamic and laryngeal factors associated with place-dependent voice onset time (VOT) differences. METHODS: The speech materials were /p∧, t∧, k∧/, each produced 15 times by 10 adult English speakers in the carrier phrase "say __ again". The sound pressure level was targeted within a ±3 dB range. Intraoral air pressure (Po) was obtained using a buccal-sulcus approach. VOT, Po, maximum Po declination rate (MPDR), duration of the laryngeal devoicing gesture (LDG), occlusion duration, and the duration of the Po drop to baseline (atmosphere) to the onset of voicing (PDOV) were determined for each stop...
August 2, 2017: Folia Phoniatrica et Logopaedica
https://www.readbyqxmd.com/read/28767095/the-combined-effects-of-aircraft-and-road-traffic-noise-and-aircraft-and-railway-noise-on-noise-annoyance-an-analysis-in-the-context-of-the-joint-research-initiative-norah
#7
Jördis Wothge, Christin Belke, Ulrich Möhler, Rainer Guski, Dirk Schreckenberg
The Noise Related Annoyance Cognition and Health (NORAH) research initiative is one of the most extensive studies on the physiological and psychological long-term effects of transportation noise in Europe. It includes research on the quality of life and annoyance as well as cardiovascular effects, sleep disturbance, breast cancer, blood pressure, depression and the cognitive development of children. Within the realm of the annoyance module of the study approximately 10,000 residents of the Rhine-Main district were surveyed on the combined effects of transportation noise...
August 2, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28757679/acoustic-ranging-in-poison-frogs-it-is-not-about-signal-amplitude-alone
#8
Max Ringler, Georgine Szipl, Walter Hödl, Leander Khil, Barbara Kofler, Michael Lonauer, Christina Provin, Eva Ringler
ABSTRACT: Acoustic ranging allows identifying the distance of a sound source and mediates inter-individual spacing and aggression in territorial species. Birds and mammals are known to use more complex cues than only sound pressure level (SPL), which can be influenced by the signaller and signal transmission in non-predictable ways and thus is not reliable by itself. For frogs, only SPL is currently known to mediate inter-individual distances, but we hypothesise that the strong territoriality of Dendrobatids could make the use of complex cues for ranging highly beneficial for this family...
2017: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/28754577/voice-use-among-music-theory-teachers-a-voice-dosimetry-and-self-assessment-study
#9
Isabel S Schiller, Dominique Morsomme, Angélique Remacle
OBJECTIVES: This study aimed (1) to investigate music theory teachers' professional and extra-professional vocal loading and background noise exposure, (2) to determine the correlation between vocal loading and background noise, and (3) to determine the correlation between vocal loading and self-evaluation data. METHODS: Using voice dosimetry, 13 music theory teachers were monitored for one workweek. The parameters analyzed were voice sound pressure level (SPL), fundamental frequency (F0), phonation time, vocal loading index (VLI), and noise SPL...
July 25, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28751031/natural-and-anthropogenic-events-influence-the-soundscapes-of-four-bays-on-hawaii-island
#10
Heather L Heenehan, Sofie M Van Parijs, Lars Bejder, Julian A Tyne, Brandon L Southall, Hugh Southall, David W Johnston
The soundscapes of four bays along the Kona Coast of Hawaii Island were monitored between January 2011 and March 2013. Equivalent, unweighted sound pressure levels within standard 1/3rd-octave bands (dB re: 1μPa) were calculated for each recording. Sound levels increased at night and were lowest during the daytime when spinner dolphins use the bays to rest. A tsunami provided an opportunity to monitor the soundscape with little anthropogenic component. We detected a decrease in sound levels and variability in one of the busiest bays...
July 24, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28742424/evaluation-of-noise-exposure-secondary-to-wind-noise-in-cyclists
#11
Michael D Seidman, Anna G Wertz, Matthew M Smith, Steve Jacob, Syed F Ahsan
Objective Determine if the noise levels of wind exposure experienced by cyclists reach levels that could contribute to noise-induced hearing loss. Study Design Industrial lab research. Setting Industrial wind tunnel. Subjects and Methods A commercial-grade electric wind tunnel was used to simulate different speeds encountered by a cyclist. A single cyclist was used during the simulation for audiometric measurements. Microphones attached near the ears of the cyclist were used to measure the sound (dB sound pressure level) experienced by the cyclist...
July 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28739331/associations-of-sex-hormones-and-anthropometry-with-the-speaking-voice-profile-in-the-adult-general-population
#12
Lasse Jost, Michael Fuchs, Markus Loeffler, Joachim Thiery, Juergen Kratzsch, Thomas Berger, Christoph Engel
OBJECTIVE: There is evidence that sexual hormone concentrations and anthropometric factors influence the human voice. The goal of this study was to investigate to what extent body mass index (BMI), body height, body weight, breast-to-abdomen-ratio, testosterone, estradiol, dehydroepiandrosterone-sulfate (DHEA-S), follicle-stimulating hormone, and luteinizing hormone are associated with the sound pressure level and the fundamental frequency of the speaking voice in a cross-sectional approach among adults in the general population...
July 21, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28732939/electromechanical-acoustical-and-thermodynamical-characterization-of-a-low-frequency-sonotrode-type-transducer-in-a-small-sonoreactor-at-different-excitation-levels-and-loading-conditions
#13
Antonio Petošić, Marko Horvat, Anet Režek Jambrak
The paper reports and compares the results of the electromechanical, acoustical and thermodynamical characterization of a low-frequency sonotrode-type ultrasonic device inside a small sonoreactor, immersed in three different loading media, namely, water, juice and milk, excited at different excitation levels, both below and above the cavitation threshold. The electroacoustic efficiency factor determined at system resonance through electromechanical characterization in degassed water as the reference medium is 88...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28731412/lung-sound-analysis-is-useful-for-monitoring-therapy-in-patients-with-bronchial-asthma
#14
T Shimoda, Y Obase, Y Nagasaka, H Nakano, R Kishikawa, T Iwanaga
BACKGROUND AND OBJECTIVE: Lung sound analysis (LSA) has been reported to be useful for predicting airway obstruction and inflammation in patients with bronchial asthma. Objectives: We examined whether the exhalation-to-inhalation sound pressure ratio in the middle frequency range (200-400 Hz) (E/I MF) is useful for monitoring therapy in patients with asthma. METHODS: The study population comprised 84 patients with mild to moderate asthma whose LSA data were available before and after 1 year of daily treatment with (budesonide 800 μg)...
2017: Journal of Investigational Allergology & Clinical Immunology
https://www.readbyqxmd.com/read/28720760/exploring-spatial-and-temporal-trends-in-the-soundscape-of-an-ecologically-significant-embayment
#15
R L Putland, R Constantine, C A Radford
The Hauraki Gulf, a shallow embayment in north-eastern New Zealand, provides an interesting environment for ecological soundscape research. It is situated on a tectonic plate boundary, contains one of the busiest ports in the southern hemisphere and is home to a diverse range of soniferous animals. The underwater soundscape was monitored for spatial and temporal trends at six different listening stations using passive acoustic recorders. The RMS sound pressure level of ambient sound (50-24,000 Hz) at the six listening stations was similar, ranging from 90-110 dB re 1 μPa throughout the recording period...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28712672/noise-induced-cochlear-synaptopathy-in-rhesus-monkeys-macaca-mulatta
#16
M D Valero, J A Burton, S N Hauser, T A Hackett, R Ramachandran, M C Liberman
Cochlear synaptopathy can result from various insults, including acoustic trauma, aging, ototoxicity, or chronic conductive hearing loss. For example, moderate noise exposure in mice can destroy up to ∼50% of synapses between auditory nerve fibers (ANFs) and inner hair cells (IHCs) without affecting outer hair cells (OHCs) or thresholds, because the synaptopathy occurs first in high-threshold ANFs. However, the fiber loss likely impairs temporal processing and hearing-in-noise, a classic complaint of those with sensorineural hearing loss...
July 8, 2017: Hearing Research
https://www.readbyqxmd.com/read/28708814/chirp-evoked-otoacoustic-emissions-and-middle-ear-absorbance-for-monitoring-ototoxicity-in-cystic-fibrosis-patients
#17
Angela C Garinis, Douglas H Keefe, Lisa L Hunter, Denis F Fitzpatrick, Daniel B Putterman, Garnett P McMillan, Jeffrey A Gold, M Patrick Feeney
OBJECTIVES: The goal of this study was to investigate the use of transient-evoked otoacoustic emissions (TEOAEs) and middle ear absorbance measurements to monitor auditory function in patients with cystic fibrosis (CF) receiving ototoxic medications. TEOAEs were elicited with a chirp stimulus using an extended bandwidth (0.71 to 8 kHz) to measure cochlear function at higher frequencies than traditional TEOAEs. Absorbance over a wide bandwidth (0.25 to 8 kHz) provides information on middle ear function...
July 13, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28696404/effect-of-wind-farm-noise-on-local-residents-decision-to-adopt-mitigation-measures
#18
Anabela Botelho, Pedro Arezes, Carlos Bernardo, Hernâni Dias, Lígia M Costa Pinto
Wind turbines' noise is frequently pointed out as the reason for local communities' objection to the installation of wind farms. The literature suggests that local residents feel annoyed by such noise and that, in many instances, this is significant enough to make them adopt noise-abatement interventions on their homes. Aiming at characterizing the relationship between wind turbine noise, annoyance, and mitigating actions, we propose a novel conceptual framework. The proposed framework posits that actual sound pressure levels of wind turbines determine individual homes' noise-abatement decisions; in addition, the framework analyzes the role that self-reported annoyance, and perception of noise levels, plays on the relationship between actual noise pressure levels and those decisions...
July 11, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28690825/white-crowned-sparrow-males-show-immediate-flexibility-in-song-amplitude-but-not-in-song-minimum-frequency-in-response-to-changes-in-noise-levels-in-the-field
#19
Elizabeth P Derryberry, Katherine Gentry, Graham E Derryberry, Jennifer N Phillips, Raymond M Danner, Julie E Danner, David A Luther
The soundscape acts as a selective agent on organisms that use acoustic signals to communicate. A number of studies document variation in structure, amplitude, or timing of signal production in correspondence with environmental noise levels thus supporting the hypothesis that organisms are changing their signaling behaviors to avoid masking. The time scale at which organisms respond is of particular interest. Signal structure may evolve across generations through processes such as cultural or genetic transmission...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28687060/safety-limit-warning-levels-for-the-avoidance-of-excessive-sound-amplification-to-protect-against-further-hearing-loss
#20
Earl E Johnson
OBJECTIVE: To determine safe output sound pressure levels (SPL) for sound amplification devices to preserve hearing sensitivity after usage. DESIGN: A mathematical model consisting of the Modified Power Law (MPL) (Humes & Jesteadt, 1991 ) combined with equations for predicting temporary threshold shift (TTS) and subsequent permanent threshold shift (PTS) (Macrae, 1994b ) was used to determine safe output SPL. STUDY SAMPLE: The study involves no new human subject measurements of loudness tolerance or threshold shifts...
July 7, 2017: International Journal of Audiology
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