scholarly journals The Skeletal Muscle Impedancemetric Characteristics as a Marker for Detection of Functional State of Organism

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Anush Deghoyan ◽  
Robert Simonyan ◽  
Howard Wachtel ◽  
Sinerik Ayrapetyan
Keyword(s):  
Skeletal Muscle ◽  
Functional State ◽  
Low Frequency ◽  
Close Correlation ◽  
Frequency Measurement ◽  
Impedance Method ◽  
Experimental Conditions ◽  
Tissue Hydration ◽  
Environmental Medium ◽  
The Comparative Study

Previously it has been shown that cell hydration is a universal and extrasensitive marker for different environmental mediums and functional state of tissue and organism. The comparative study of cell hydration of different organs (brain cortex, liver, and skeletal muscle) at various experimental conditions (microstress, pathology, and different poisons) was realized. It was shown that among tissues of different organs muscle hydration is more sensitive to any change of functional state of organism and environmental medium. The study of correlation between tissue muscle hydration and double-frequency measurement impedance method indicated that the differences between muscle reactive conductivity measured at high frequency (HF) and low frequency (LF) could be an adequate marker for detection of muscle hydration. The animal poisoning, stress, and pathology-induced tissue hydration were accompanied by increase in . The observed close correlation between time-dependent tissue hydration and in different environmental mediums can be a marker for detection of postmortal period as well as for characterizing environmental medium of the corpse.

scholarly journals A phase-locked loop using ESO-based loop filter for grid-connected converter: performance analysis

2021 ◽  
Author(s):  
Baoling Guo ◽  
Seddik Bacha ◽  
Mazen Alamir ◽  
Julien Pouget
Keyword(s):  
Performance Analysis ◽  
Frequency Domain ◽  
Low Frequency ◽  
Experimental Tests ◽  
Frequency Measurement ◽  
Phase Locked Loop ◽  
Frequency Domain Analysis ◽  
Loop Filter ◽  
Control Stability ◽  
Unbalanced Grid

AbstractAn extended state observer (ESO)-based loop filter is designed for the phase-locked loop (PLL) involved in a disturbed grid-connected converter (GcC). This ESO-based design enhances the performances and robustness of the PLL, and, therefore, improves control performances of the disturbed GcCs. Besides, the ESO-based LF can be applied to PLLs with extra filters for abnormal grid conditions. The unbalanced grid is particularly taken into account for the performance analysis. A tuning approach based on the well-designed PI controller is discussed, which results in a fair comparison with conventional PI-type PLLs. The frequency domain properties are quantitatively analysed with respect to the control stability and the noises rejection. The frequency domain analysis and simulation results suggest that the performances of the generated ESO-based controllers are comparable to those of the PI control at low frequency, while have better ability to attenuate high-frequency measurement noises. The phase margin decreases slightly, but remains acceptable. Finally, experimental tests are conducted with a hybrid power hardware-in-the-loop benchmark, in which balanced/unbalanced cases are both explored. The obtained results prove the effectiveness of ESO-based PLLs when applied to the disturbed GcC.

The comparative study of high- and low-frequency ultrasound therapy on bone regeneration

2003 ◽  
Vol 29 (5) ◽  
pp. S120-S121
Author(s):  
S. Bashardoust Tajali ◽  
S. Kazemi ◽  
A. Azari ◽  
A. Shahverdi ◽  
M. Jabal Ameli
Keyword(s):  
Comparative Study ◽  
Bone Regeneration ◽  
Low Frequency ◽  
Ultrasound Therapy ◽  
Low Frequency Ultrasound ◽  
The Comparative Study ◽  
Frequency Ultrasound

The effect of the resistance to respiration on the functional state of the respiratory center in dogs in chronic experimental conditions

1965 ◽  
Vol 60 (2) ◽  
pp. 856-858
Author(s):  
A. I. Smirnov ◽  
V. S. Raevskii ◽  
E. A. Belyavskaya ◽  
T. N. Kovaleva
Keyword(s):  
Functional State ◽  
Respiratory Center ◽  
Experimental Conditions ◽  
Resistance To Respiration

Reactive oxygen species formation in the transition to hypoxia in skeletal muscle

2005 ◽  
Vol 289 (1) ◽  
pp. C207-C216 ◽  
Author(s):  
Li Zuo ◽  
Thomas L. Clanton
Keyword(s):  
Reactive Oxygen Species ◽  
Skeletal Muscle ◽  
Acute Hypoxia ◽  
Low Frequency ◽  
Metabolic Stress ◽  
Reactive Oxygen ◽  
Fluorescence Signal ◽  
Oxygen Species ◽  
Peroxidase Mimic ◽  
Intracellular Ros

Many tissues produce reactive oxygen species (ROS) during reoxygenation after hypoxia or ischemia; however, whether ROS are formed during hypoxia is controversial. We tested the hypothesis that ROS are generated in skeletal muscle during exposure to acute hypoxia before reoxygenation. Isolated rat diaphragm strips were loaded with dihydrofluorescein-DA (Hfluor-DA), a probe that is oxidized to fluorescein (Fluor) by intracellular ROS. Changes in fluorescence due to Fluor, NADH, and FAD were measured using a tissue fluorometer. The system had a detection limit of 1 μM H2O2 applied to the muscle superfusate. When the superfusion buffer was changed rapidly from 95% O2 to 0%, 5%, 21%, or 40% O2, transient elevations in Fluor were observed that were proportional to the rise in NADH fluorescence and inversely proportional to the level of O2 exposure. This signal could be inhibited completely with 40 μM ebselen, a glutathione peroxidase mimic. After brief hypoxia exposure (10 min) or exposure to brief periods of H2O2, the fluorescence signal returned to baseline. Furthermore, tissues loaded with the oxidized form of the probe (Fluor-DA) showed a similar pattern of response that could be inhibited with ebselen. These results suggest that Fluor exists in a partially reversible redox state within the tissue. When Hfluor-loaded tissues were contracted with low-frequency twitches, Fluor emission and NADH emission were significantly elevated in a way that resembled the hypoxia-induced signal. We conclude that in the transition to low intracellular Po2, a burst of intracellular ROS is formed that may have functional implications regarding skeletal muscle O2-sensing systems and responses to acute metabolic stress.

scholarly journals Priming effects in the recognition of simple and complex words and pseudowords

2018 ◽  
Vol 39 (2) ◽  
pp. 198-222
Author(s):  
Miguel Lázaro ◽  
Víctor Illera ◽  
Javier Sainz
Keyword(s):  
Word Recognition ◽  
Low Frequency ◽  
Morphological Processing ◽  
Orthographic Processing ◽  
Frequency Effect ◽  
Experimental Conditions ◽  
Priming Effects ◽  
The Third ◽  
Complex Words ◽  
Intense Debate

AbstractWhether morphological processing of complex words occurs beyond orthographic processing is a matter of intense debate. In this study, morphological processing is examined by presenting complex words (brujería -> brujo –witchcraft -> witch), as well as simple (brujaña->brujo) and complex pseudowords (brujanza ->brujo), as primes in three masked lexical decision tasks. In the first experiment, the three experimental conditions facilitated word recognition in comparison to the control condition, but no differences emerged between them. Given the importance of the surface frequency effect observed, a second experiment was conducted. The results fully replicate those observed in the first one, but this time with low frequency targets. In the third experiment, vowels were removed from the stems of primes to reduce the orthographic overlap between primes and targets and, therefore, the influence of the embedded stem effect. The results show facilitative effects only for complex words. However, paired comparisons show no differences between experimental conditions. The overall results show the central role played by the processing of stems in visual word recognition and are explained in terms of current models of morphological processing.

scholarly journals Water Level Sensing in a Steel Vessel Using A0 and Quasi-Scholte Waves

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Peng Guo ◽  
Bo Deng ◽  
Xiang Lan ◽  
Kaili Zhang ◽  
Hongyuan Li ◽  
...  
Keyword(s):  
Water Level ◽  
Guided Waves ◽  
Mode Conversion ◽  
Experimental Studies ◽  
Low Frequency ◽  
Steel Vessel ◽  
Theoretical Predictions ◽  
Travelling Time ◽  
The Comparative Study ◽  
Group Velocities

This paper presents a water level sensing method using guided waves of A0 and quasi-Scholte modes. Theoretical, numerical, and experimental studies are performed to investigate the properties of both the A0 and quasi-Scholte modes. The comparative study of dispersion curves reveals that the plate with one side in water supports a quasi-Scholte mode besides Lamb modes. In addition, group velocities of A0 and quasi-Scholte modes are different. It is also found that the low-frequency A0 mode propagating in a free plate can convert to the quasi-Scholte mode when the plate has one side in water. Based on the velocity difference and mode conversion, a water level sensing method is developed. For the proof of concept, a laboratory experiment using a pitch-catch configuration with two piezoelectric transducers is designed for sensing water level in a steel vessel. The experimental results show that the travelling time between the two transducers linearly increases with the increase of water level and agree well with the theoretical predictions.

scholarly journals Active and inactive forms of pyruvatedehydrogenase in skeletal muscle as related to the metabolic and functional state of the muscle cell

FEBS Letters ◽  
1975 ◽  
Vol 59 (2) ◽  
pp. 142-145 ◽  
Author(s):  
G. Hennig ◽  
G. Löffler ◽  
O.H. Wieland
Keyword(s):  
Skeletal Muscle ◽  
Muscle Cell ◽  
Functional State

Enhancement of Gene Delivery into Mouse Skeletal Muscle with Microbubble Destruction by Low-Frequency Ultrasound

2006 ◽  
Vol 36 (1) ◽  
pp. 32
Author(s):  
Sang Chol Lee ◽  
Sung Soo Jung ◽  
Seon Woon Kim ◽  
Sung Hoon Lim ◽  
Dae Kyung Cho ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Gene Delivery ◽  
Low Frequency ◽  
Mouse Skeletal Muscle ◽  
Low Frequency Ultrasound ◽  
Frequency Ultrasound

The charge mobility in polymer LEDs-the low frequency impedance method

2003 ◽  
Vol 135-136 ◽  
pp. 5-6
Author(s):  
I.N. Hulea ◽  
H.B. Brom ◽  
K. Brunner ◽  
R.F.J.v.d. Scheer ◽  
M.A.J. Michels
Keyword(s):  
Low Frequency ◽  
Impedance Method ◽  
Charge Mobility ◽  
Polymer Leds

scholarly journals Reactive oxygen species and fatigue-induced prolonged low-frequency force depression in skeletal muscle fibres of rats, mice and SOD2 overexpressing mice

2008 ◽  
Vol 586 (1) ◽  
pp. 175-184 ◽  
Author(s):  
Joseph D. Bruton ◽  
Nicolas Place ◽  
Takashi Yamada ◽  
José P. Silva ◽  
Francisco H. Andrade ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Skeletal Muscle ◽  
Low Frequency ◽  
Reactive Oxygen ◽  
Muscle Fibres ◽  
Oxygen Species ◽  
Force Depression ◽  
Skeletal Muscle Fibres
Sign in / Sign up

Export Citation Format

Share Document