Direct Sound
Mostrando 25-36 de 42 artigos, teses e dissertações.
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25. Pure-tone birdsong by resonance filtering of harmonic overtones
Pure-tone song is a common and widespread phenomenon in birds. The mechanistic origin of this type of phonation has been the subject of long-standing discussion. Currently, there are three hypotheses. (i) A vibrating valve in the avian vocal organ, the syrinx, generates a multifrequency harmonic source sound, which is filtered to a pure tone by a vocal
National Academy of Sciences.
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26. Release and re-buildup of listeners’ models of auditory space
When listeners hear sound presented repeatedly in a room with reflections, echo threshold rises. The current experiments tested how long this buildup in echo threshold would last when exposure to a different simulated space (designated as room B) intervened before returning to the original space (designated room A). Stimuli were trains of lead–lag click pa
Acoustical Society of America.
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27. Distribution of viral abundance in the reef environment of Key Largo, Florida.
The distribution of viral and microbial abundance in the Key Largo, Fla., reef environment was measured. Viral abundance was measured by transmission electron microscope direct counts and plaque titer on specific bacterial hosts in water and sediment samples from Florida Bay (Blackwater Sound) and along a transect from Key Largo to the outer edge of the reef
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28. Developing optimal search strategies for detecting clinically sound studies in MEDLINE.
OBJECTIVE: To develop optimal MEDLINE search strategies for retrieving sound clinical studies of the etiology, prognosis, diagnosis, prevention, or treatment of disorders in adult general medicine. DESIGN: Analytic survey of operating characteristics of search strategies developed by computerized combinations of terms selected to detect studies meeting basic
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29. Using Stimulus-Stimulus Pairing and Direct Reinforcement to Teach Vocal Verbal Behavior to Young Children With Autism
In this study the effect of a stimulus-stimulus pairing procedure was used as part of a clinical investigation to increase vocalizations for two young children diagnosed with autism. This procedure involved pairing a vocal sound with a preferred stimulus (e.g., toy) to condition automatic reinforcement. In addition, this study assessed the effects of a direc
Association for Behavior Analysis International.
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30. Environmental Investigations of Vibrio parahaemolyticus in Oysters after Outbreaks in Washington, Texas, and New York (1997 and 1998)
Total Vibrio parahaemolyticus densities and the occurrence of pathogenic strains in shellfish were determined following outbreaks in Washington, Texas, and New York. Recently developed nonradioactive DNA probes were utilized for the first time for direct enumeration of V. parahaemolyticus in environmental shellfish samples. V. parahaemolyticus was prevalent
American Society for Microbiology.
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31. On cortical coding of vocal communication sounds in primates
Understanding how the brain processes vocal communication sounds is one of the most challenging problems in neuroscience. Our understanding of how the cortex accomplishes this unique task should greatly facilitate our understanding of cortical mechanisms in general. Perception of species-specific communication sounds is an important aspect of the audito
The National Academy of Sciences.
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32. Novel motor gestures for phonation during inspiration enhance the acoustic complexity of birdsong.
Sound generation based on a pulmonary mechanism typically occurs during the expiratory phase of respiration. Phonation during inspiration has been postulated for the calls of some amphibians and for exceptional sounds in some human languages. No direct evidence exists for phonation during inspiration in birds, but such a mechanism has been proposed to explai
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33. Ventral Cochlear Nucleus Responses to Contralateral Sound Are Mediated by Commissural and Olivocochlear Pathways
In the normal guinea pig, contralateral sound inhibits more than a third of ventral cochlear nucleus (VCN) neurons but excites <4% of these neurons. However, unilateral conductive hearing loss (CHL) and cochlear ablation (CA) result in a major enhancement of contralateral excitation. The response properties of the contralateral excitation produced by CHL and
American Physiological Society.
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34. Elasticity of MgO and a primary pressure scale to 55 GPa
We have studied the elasticity and pressure–density equation of state of MgO in diamond cells to 55 GPa and have doubled the previous pressure limit of accurate elasticity determinations for crystals. Integrating single-crystal velocity data from Brillouin scattering measurements and density data from polycrystalline x-ray diffraction, we obtained the
The National Academy of Sciences.
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35. Diabetes care.
Providing good quality diabetes care is complex but achievable. Many aspects of the care do not require high tech medicine but, rather, good organisation. Diabetes is a costly disease, consuming 1500 pounds per diabetic patient per year versus 500 pounds on average for a non-diabetic member of the population in health service costs. Investment now in good qu
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36. Tertiary base pair interactions in slipped loop-DNA: an NMR and model building study.
Short direct repeat sequences are often found in regulatory regions of various genes; in some cases they display hypersensitivity to S1 nuclease cleavage in supercoiled plasmids. A non-standard DNA structure (Slipped Loop Structure, or SLS) has been proposed for these regions in order to explain the S1 cleavage data; the formation of this structure may be in