scholarly journals Acoustic characterisation of string instruments by internal cavity measurements

2021 ◽  
Vol 150 (3) ◽  
pp. 1922-1933
Author(s):  
Colin Gough
Keyword(s):  
Internal Cavity ◽  
String Instruments

Internal cavity characteristics of northern long-eared bat (Myotis septentrionalis) maternity day-roosts

2015 ◽  
Author(s):  
Alexander Silvis ◽  
R. Edward Thomas ◽  
W. Mark Ford ◽  
Eric R. Britzke ◽  
Meryl J. Friedrich
Keyword(s):  
Internal Cavity ◽  
Myotis Septentrionalis ◽  
Cavity Characteristics

scholarly journals Cyclodextrins, Natural Compounds, and Plant Bioactives—A Nutritional Perspective

Biomolecules ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 401
Author(s):  
Svenja Wüpper ◽  
Kai Lüersen ◽  
Gerald Rimbach
Keyword(s):  
Intestinal Flora ◽  
Aqueous Solubility ◽  
Outer Wall ◽  
Natural Compounds ◽  
Model Organisms ◽  
Laboratory Model ◽  
Internal Cavity ◽  
Pentacyclic Triterpenoids ◽  
Starch Derivatives ◽  
Improved Stability

Cyclodextrins (CDs) are a group of cyclic oligosaccharides produced from starch or starch derivatives. They contain six (αCD), seven (βCD), eight (γCD), or more glucopyranose monomers linked via α-1,4-glycosidic bonds. CDs have a truncated cone shape with a hydrophilic outer wall and a less hydrophilic inner wall, the latter forming a more apolar internal cavity. Because of this special architecture, CDs are soluble in water and can simultaneously host lipophilic guest molecules. The major advantage of inclusion into CDs is increased aqueous solubility of such lipophilic substances. Accordingly, we present studies where the complexation of natural compounds such as propolis and dietary plant bioactives (e.g., tocotrienol, pentacyclic triterpenoids, curcumin) with γCD resulted in improved stability, bioavailability, and bioactivity in various laboratory model organisms and in humans. We also address safety aspects that may arise from increased bioavailability of plant extracts or natural compounds owing to CD complexation. When orally administered, α- and βCD—which are inert to intestinal digestion—are fermented by the human intestinal flora, while γCD is almost completely degraded to glucose units by α-amylase. Hence, recent reports indicate that empty γCD supplementation exhibits metabolic activity on its own, which may provide opportunities for new applications.

A Surprisingly Gentle Approach to Cavity Containing Spherocylindrical Microparticles from Ordinary Polymer Dispersions in Flow

2021 ◽  
Author(s):  
Amit K. Tripathi ◽  
John G. Tsavalas
Keyword(s):  
Internal Cavity ◽  
Polymeric Microparticles ◽  
Polymer Dispersions

Herein, we demonstrate a facile approach to fully transform spherical polymeric microparticles to elongated spherocylinders containing an internal cavity under ambient and mild stirring conditions. Critical to the process is...

scholarly journals Diversity in the structures and ligand-binding sites of nematode fatty acid and retinol-binding proteins revealed by Na-FAR-1 from Necator americanus

2015 ◽  
Vol 471 (3) ◽  
pp. 403-414 ◽  
Author(s):  
M. Florencia Rey-Burusco ◽  
Marina Ibáñez-Shimabukuro ◽  
Mads Gabrielsen ◽  
Gisela R. Franchini ◽  
Andrew J. Roe ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Ligand Binding ◽  
Tissue Distribution ◽  
Binding Sites ◽  
Binding Proteins ◽  
Retinol Binding Protein ◽  
Internal Cavity ◽  
Binding Characteristics ◽  
Necator Americanus ◽  
Ligand Binding Sites

Necator americanus fatty acid and retinol-binding protein-1 (Na-FAR-1) is an abundantly expressed FAR from a parasitic hookworm. The present work describes its tissue distribution, structure and ligand-binding characteristics and shows that Na-FAR-1 expands to transport multiple FA molecules in its internal cavity.

Artificially Ventilated Cavities: Evaluating the Constant-Pressure Approximation

2017 ◽  
Author(s):  
Melissa A. Fronzeo ◽  
Michael Kinzel ◽  
Jules Lindau
Keyword(s):  
Constant Pressure ◽  
Flow Behavior ◽  
Internal Cavity ◽  
Common Assumption ◽  
Ventilated Cavity ◽  
Physical Insight ◽  
Circulatory Flow ◽  
Computational Fluid Dynamics Cfd ◽  
The Common ◽  
Semi Empirical

Computational Fluid Dynamics (CFD) is employed to study the fundamental aspects of the internal pressure within artificially ventilated, gaseous cavities in both twin- and toroidal-vortex closure modes. The results show that several pressure regions develop within the cavities, indicating that the common assumption that the cavity has a constant pressure breaks down when evaluated in high detail. The internal cavity pressure is evaluated using a probability density function (PDF). The resulting PDF plots show a clusters with multiple peaks. A mixture-of-Gaussians (MOG) method is employed to better understand the distributions of these peaks. These peaks are then mapped to the simulation results, where it is observed that these peaks correlate to distinct cavity regions (which vary depending on cavity type). Moreover, these varying pressure regions appear to align with cavity-radius growth and reduction and appear to be the driving force of the internal, circulatory flow. Lastly, the importance of these pressure regions are investigated with respect to predictions from semi-empirical theory of the cavity shape, showing a moderate impact depending on where the cavity is probed. Overall, these results provide physical insight into ventilated cavity flow behavior that is often ignored.

Occupational Performance Issues and Predictors of Dysfunction in College Instrumentalists

2008 ◽  
Vol 23 (2) ◽  
pp. 72-78
Author(s):  
Rebecca Barton ◽  
Clyde Killian ◽  
Morgan Bushee ◽  
Julia Callen ◽  
Teresa Cupp ◽  
...  
Keyword(s):  
Instrumental Music ◽  
Physical Symptoms ◽  
Music Majors ◽  
Occupational Performance ◽  
Functional Impairments ◽  
String Instruments ◽  
College Age ◽  
The Impact ◽  
Minimal Research ◽  
Survey Questionnaires

Music-related injuries among musicians, including younger musicians, have been well documented; however, minimal research has been completed with college-aged instrumentalists. The purpose of this research study was to describe the presence of physical symptoms in college-age musicians and the impact of these symptoms on music-playing and other daily occupations. Data collection was completed on college instrumental music majors using two survey questionnaires, which documented the presence of physical symptoms in the upper limb and the impact of these symptoms on function. The results indicate that a significant number of students reported pain or discomfort that occurred during music-playing, at rest, and during other daily occupations. Results were consistent with the literature in regards to the prevalence of symptoms in female instrumentalists as compared to males and the occurrence of more symptoms in those individuals playing string instruments and piano as compared to other instrument groups. Also, as self-reported pain increased, a greater level of dysfunction in occupational performance was found. Results also indicated that when participants were already implementing intervention strategies, this was perhaps a predictor of the presence of pain and dysfunction. Health professionals should be encouraged to provide preventive education for student musicians and to use outcome measures, such as the Disabilities of the Hand, Arm, and Shoulder (DASH) outcome measure, to identify the potential for functional impairments.

Restoring Wrist Rotation in Injured Pianists and Violinists

2009 ◽  
Vol 24 (2) ◽  
pp. 88-90
Author(s):  
Ian Winspur ◽  
Katherine Butler
Keyword(s):  
General Population ◽  
Distal Ulna ◽  
Professional Musicians ◽  
String Instruments ◽  
Wrist Fractures ◽  
Technical Details ◽  
The Ideal

Wrist fractures are common injuries in musicians, and a number of these fractures heal in a mal-united position, interfering with wrist rotation. This can prevent musicians who play keyboard instruments and the smaller string instruments from assuming the required wrist positions. Resection of the distal ulna (Darrach procedure), while somewhat discredited for the general population, has proved to be the ideal operation for this problem in musicians and has been used successfully on five professional musicians. This procedure, the rationale for its use in musicians, and the important technical details are discussed.

Playability of the wolf note of bowed string instruments

2018 ◽  
Vol 144 (5) ◽  
pp. 2852-2858
Author(s):  
Ailin Zhang ◽  
Jim Woodhouse
Keyword(s):  
String Instruments
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