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https://www.readbyqxmd.com/read/28231699/optimization-of-ultrasonic-assisted-enzymatic-hydrolysis-conditions-for-the-production-of-antioxidant-hydrolysates-from-porcine-liver-by-using-response-surface-methodology
#1
Hui-Chuan Yu, Fa-Jui Tan
Objective: The objective of this study was to optimize ultrasonic-assisted enzymatic hydrolysis conditions, including enzyme-to-substrate (E/S) ratio, pH, and temperature, for producing porcine liver hydrolysates (PLHs) with the highest 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity by using response surface methodology (RSM). Methods: The study used RSM to determine the combination of hydrolysis parameters that maximized the antioxidant activity of our PLHs...
February 23, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28231486/coded-excitation-waveform-engineering-for-high-frame-rate-synthetic-aperture-ultrasound-imaging
#2
Bahman Lashkari, Kaicheng Zhang, Edem Dovlo, Andreas Mandelis
Coded excitation was initially introduced to ultrasound imaging as a method for enhancing the signal-to-noise ratio (SNR). However, this method was also shown to be helpful in conjunction with synthetic aperture transmission for high frame rate imaging. Recently, we introduced two families of mismatched coded excitations based on frequency modulation chirp and combined frequency modulation and Golay code. Here "mismatched" indicates that the coded excitations generate very small cross-correlations among themselves while each has a very strong autocorrelation...
February 12, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28231345/in-vitro-evaluation-of-three-methods-for-the-retrieval-of-fractured-screw-fragments-from-dental-implants
#3
Rubén Agustín-Panadero, Carlos Labaig-Rueda, Beatriz Castillo-Rodriguez, Alberto Ferreiroa, María Fernanda Solá-Ruíz
PURPOSE: To compare the effectiveness of different methods of fractured screw fragment retrieval from dental implants, comparing a conventional method (use of an exploration probe and ultrasonic tips) with two mechanical retrieval kits. MATERIALS AND METHODS: One hundred thirty-five screws in implant internal connections were fractured to test fragment retrieval comparing three methods: conventional method with the use of an explorer probe and ultrasonic tips (group CE), extraction with a mechanical kit with a guide cylinder (group MK1), and extraction with a mechanical kit without a guide cylinder (group MK2)...
February 23, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28231174/optimization-of-ultrasound-assisted-extraction-preliminary-characterization-and-in-vitro-antioxidant-activity-of-polysaccharides-from-green-pea-pods
#4
Maryam Jalili Safaryan, Ali Ganjloo, Mandana Bimakr, Soheila Zarringhalami
In this study, ultrasound-assisted extraction of green pea pod polysaccharide (GPPP) was investigated and optimized using a central composite response surface design coupled with a numerical optimization technique. The effects of ultrasonic power (50-150 W), sonication time (20-80 min), ratio of water to raw material (20:1-40:1 mL/g) and extraction temperature (40-80 °C) on polysaccharide extraction yield were studied. The maximum extraction yield was obtained with a sonication power of 135.34 W, extraction time of 48...
November 28, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28230799/evaluation-of-extraction-and-degradation-methods-to-obtain-chickpeasaponin-b1-from-chickpea-cicer-arietinum-l
#5
Kun Cheng, Hua Gao, Rong-Rong Wang, Yang Liu, Yu-Xue Hou, Xiao-Hong Liu, Kun Liu, Wei Wang
The objective of this research is to implement extraction and degradation methods for the obtainment of 3-O-[α-l-rhamnopyranosyl-(1→2)-β-d-galactopyranosyl] soyasapogenol B (chickpeasaponin B1) from chickpea. The effects of microwave-assisted extraction (MAE) processing parameters-such as ethanol concentration, solvent/solid ratio, extraction temperature, microwave irradiation power, and irradiation time-were evaluated. Using 1g of material with 8 mL of 70% aqueous ethanol and an extraction time of 10 min at 70 °C under irradiation power 400W provided optimal extraction conditions...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28229944/development-and-in-vivo-evaluation-of-an-innovative-hydrochlorothiazide-in-cyclodextrins-in-solid-lipid-nanoparticles-formulation-with-sustained-release-and-enhanced-oral-bioavailability-for-the-hypertension-treatment-in-pediatrics
#6
Marzia Cirri, Natascia Mennini, Francesca Maestrelli, Paola Mura, Carla Ghelardini, Lorenzo di Cesare Mannelli
An innovative pediatric oral formulation of hydrochlorothiazide (HCT) (2mg/mL), endowed with improved bioavailability and sustained release properties and suitable for the hypertension treatment in pediatric patients, was developed by combining the drug-cyclodextrin complexation and the incorporation of the complex into Solid Lipid Nanoparticles (SLN). Precirol(®)ATO5-based SLN, with two different surfactants (Pluronic(®)F68 and Tween(®)80) loaded with the drug as such or as binary system with hydroxypropyl-beta-cyclodextrin (HPβCd) and sulfobutyl-ether-beta-cyclodextrin (SBEβCd) both as physical mixture (P...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28228823/recognising-small-image-quality-differences-for-ultrasound-probes-and-the-potential-of-misdiagnosis-due-to-undetected-side-lobes
#7
Georg Doblhoff, Jaroslav Satrapa, Philip Coulthard
BACKGROUND: Ultrasonic imaging is an integral and routine procedure in many medical applications. An increased awareness of the need for quality assurance in this field has led to numerous tests being proposed. Due to the complexity of the problem, the tests directly measuring the important parameters of resolution and contrast of low-echoic structures are not unified, often more qualitative than quantitative, and are performed at large periodic intervals. Uniform sensitivity of an array transducer is a necessary but insufficient requirement for imaging quality of an ultrasound probe...
February 2017: Ultrasound: Journal of the British Medical Ultrasound Society
https://www.readbyqxmd.com/read/28228625/comparison-of-triple-antibiotic-paste-removal-by-different-irrigation-techniques
#8
Hacer Aksel, Selen Küçükkaya Eren, Ahmet Serper
This study compared different irrigation techniques in triple antibiotic paste (TAP) removal from root canals. Fifty-six maxillaryanterior-teeth were filled with TAP for 28 days, and assigned into 5 experimental groups (n=10): Syringe irrigation (SI), NaviTip FX (NFX), Vibringe-Syringe irrigation (V-SI), NaviTip FX-Vibringe (V-NFX), passive ultrasonic irrigation (PUI) and positive and negative control groups (n=3 for each). Following the removal of the medicament, the remaining medicament was evaluated using 4-grade scoring-system...
February 22, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28227632/a-wearable-system-for-asymmetric-contactless-human-sensing
#9
Henry Griffith, Yan Shi, Subir Biswas, Henry Griffith, Yan Shi, Subir Biswas, Henry Griffith, Subir Biswas, Yan Shi
A wearable sensor capable of detecting the presence of humans within a front-facing 90-degree sector of varying radius is demonstrated herein. The system offers extensive applicability across a variety of scenarios where detecting the parameters of human interaction, including separation distance and duration, is of value. Sensing is accomplished using an ultrasonic distance and passive infrared sensor. This design improves upon previous approaches presented in the literature by eliminating privacy concerns associated with audio and video capture, and also relaxing the requirement that both interacting individuals be in possession of dedicated hardware...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227616/contactless-on-bed-activity-sensing-using-first-reflection-echolocation
#10
Henry Griffith, Yan Shi, Subir Biswas, Henry Griffith, Yan Shi, Subir Biswas, Henry Griffith, Subir Biswas, Yan Shi
A novel system capable of detecting on-bed activity during sleep using first-reflection ultrasonic echolocation is described herein. As is employed in many existing solutions, such activity detection may be utilized in the assessment of sleep quality. Compared to current approaches using either wearable devices or sensors collocated on the surface of the bed, the proposed architecture greatly enhances convenience for the end-user by providing minimal disruptions to his or her standard sleep routine. A series of experiments were conducted in order to investigate the capacity of the system to detect activity during sleep...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227535/skills-based-evaluation-of-alternative-input-methods-to-command-a-semi-autonomous-electric-wheelchair
#11
Mario Rojas, Pedro Ponce, Arturo Molina, Mario Rojas, Pedro Ponce, Arturo Molina, Pedro Ponce, Mario Rojas, Arturo Molina
This paper presents the evaluation, under standardized metrics, of alternative input methods to steer and maneuver a semi-autonomous electric wheelchair. The Human-Machine Interface (HMI), which includes a virtual joystick, head movements and speech recognition controls, was designed to facilitate mobility skills for severely disabled people. Thirteen tasks, which are common to all the wheelchair users, were attempted five times by controlling it with the virtual joystick and the hands-free interfaces in different areas for disabled and non-disabled people...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227128/boundary-element-simulation-of-ultrasonic-backscattering-during-the-fracture-healing-process
#12
Vassiliki T Potsika, Konstantinos N Grivas, Theodoras Gortsas, Vasilios C Protopappas, Demosthenes K Polyzos, Dimitrios I Fotiadis, Vassiliki T Potsika, Konstantinos N Grivas, Theodoras Gortsas, Vasilios C Protopappas, Demosthenes K Polyzos, Dimitrios I Fotiadis, Dimitrios I Fotiadis, Theodoros Gortsas, Vasilios C Protopappas, Vassiliki T Potsika, Konstantinos N Grivas, Demosthenes K Polyzos
Competent fracture healing monitoring and treatment requires an extensive knowledge of bone biology and microstructure. The use of non-invasive and non-radiating means for the monitoring of the bone healing process has gained significant interest in recent years. Ultrasound is considered as a modality which can contribute to the assessment of bone status during the healing process, as well as, enhance the rate of the tissues' ossification. This work presents boundary element simulations of ultrasound propagation in healing long bones to investigate the monitoring potential of backscattering parameters...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227115/plural-spectral-frequency-divisions-for-ultrasonic-tissue-displacement-vector-measurement
#13
C Sumi, C Sumi, C Sumi
For a human tissue displacement vector or strain tensor measurement, the plural spectral frequency division method (PSFDM) is presented. In this report, the effectiveness of the processing is demonstrated by performing the measurements on an agar phantom interrogated by wideband ultrasonic (US) single beam scanning and compounding of steered plane wave transmissions.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226975/portable-forced-oscillation-device-for-point-of-care-pulmonary-function-testing
#14
Jian Cao, Ashutosh Sabharwal, Jian Cao, Ashutosh Sabharwal, Jian Cao, Ashutosh Sabharwal
The forced oscillation technique (FOT) provides a simple and accurate approach for pulmonary function testing. However, most current devices are large and high cost, hence the test remains sparingly used. To address this problem, we verified the feasibility of a smart and portable forced oscillation device based on a small subwoofer and ultrasonic sensor that is targeted at point-of-care pulmonary function testing. In this paper, we first develop and optimize the signal processing algorithm for impedance estimation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226894/optimal-resonance-configuration-for-ultrasonic-wireless-power-transmission-to-millimeter-sized-biomedical-implants
#15
Miao Meng, Mehdi Kiani, Miao Meng, Mehdi Kiani, Miao Meng, Mehdi Kiani
In order to achieve efficient wireless power transmission (WPT) to biomedical implants with millimeter (mm) dimensions, ultrasonic WPT links have recently been proposed. Operating both transmitter (Tx) and receiver (Rx) ultrasonic transducers at their resonance frequency (fr) is key in improving power transmission efficiency (PTE). In this paper, different resonance configurations for Tx and Rx transducers, including series and parallel resonance, have been studied to help the designers of ultrasonic WPT links to choose the optimal resonance configuration for Tx and Rx that maximizes PTE...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226555/an-ultrasonically-powered-implantable-device-for-targeted-drug-delivery
#16
Jayant Charthad, Spyridon Baltsavias, Devleena Samanta, Ting Chia Chang, Marcus J Weber, Niloufar Hosseini-Nassab, Richard N Zare, Amin Arbabian, Jayant Charthad, Spyridon Baltsavias, Devleena Samanta, Ting Chia Chang, Marcus J Weber, Niloufar Hosseini-Nassab, Richard N Zare, Amin Arbabian, Spyridon Baltsavias, Marcus J Weber, Devleena Samanta, Richard N Zare, Ting Chia Chang, Niloufar Hosseini-Nassab, Jayant Charthad, Amin Arbabian
A wirelessly powered implantable device is proposed for fully programmable and localized drug delivery. The implant is powered using an external ultrasonic transmitter and operates at <; 5% of the FDA diagnostic ultrasound intensity limit. Drug release is achieved through electrical stimulation of drug-loaded polypyrrole nanoparticles. A design methodology for the implant electronics is presented and experimentally demonstrated to be accurate in predicting the concentration of the released drug. To the best of our knowledge, this is the first ultrasonically powered implantable device platform for targeted drug delivery using electroresponsive polymers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226348/-the-key-points-of-prevention-for-special-surgical-complications-after-radical-operation-of-gastric-cancer
#17
Hao Xu, Weizhi Wang, Panyuan Li, Diancai Zhang, Li Yang, Zekuan Xu
Incidence of gastric cancer is high in China and standard radical operation is currently the main treatment for gastric cancer. Postoperative complications, especially some special complications, can directly affect the prognosis of patients, even result in the increase of mortality. But the incidences of these special complications are low, so these complications are often misdiagnosed and delayed in treatment owing to insufficient recognition of medical staff. These special complications include (1) Peterson hernia: It is an abdominal hernia developed in the space between Roux loop and transverse colon mesentery after Roux-Y reconstruction of digestive tract...
February 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28225600/kinetics-and-mechanism-of-ultrasonic-activation-of-persulfate-an-in-situ-epr-spin-trapping-study
#18
Zongsu Wei, Frederick A Villamena, Linda K Weavers
Ultrasound (US) was shown to activate persulfate (PS) providing an alternative activation method to base or heat as an in-situ chemical oxidation (ISCO) method. The kinetics and mechanism of ultrasonic activation of PS were examined in aqueous solution using an in-situ electron paramagnetic resonance (EPR) spin trapping technique and radical trapping with probe compounds. Using the spin trap, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), hydroxyl radical (•OH) and sulfate radical anion (SO4•‒) were measured from ultrasonic activation of persulfate (US-PS)...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28224438/ultrasound-diagnosis-of-fetal-thanatophoric-skeletal-dysplasia-three-cases-report-and-a-brief-review
#19
Qing-Hong Zhao, Hua Shi, Jia-Qi Hu, Dan Wang, Gui Fang, Yu-Guo Zhang, Yan-Qing Wang, Jing Yang
Congenital skeletal deformity of fetus varies and may be attributed to a range of reasons. Congenital skeletal deformity seriously affects body function or even leads to neonatal death directly. The disease brings great pain to victim and their family. We reviewed the fetal prenatal ultrasonic data conducted during period from Jan. 2013 to June 2016, and there were 84 fetuses with skeletal abnormalities among 12 000 cases, and 3 fetuses with thanatophoric dysplasia. Our report described and reviewed three common types of thanatophoric dysplasia, aiming to explore the value of standardized prenatal ultrasonic diagnosis of fetal abnormalities in the skeletal system...
February 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28223035/effects-of-quinestrol-on-the-vocal-behavior-of-mice-during-courtship-interactions
#20
Yi Chen, Qianqian Su, Quansheng Liu
Vocalizations are a crucial part of courtship and mating in a wide variety of species. Mating behavior, including courtship calls, is modulated by sex steroid hormones. Male mice produce courtship ultrasonic vocalizations to attract females during heterosexual encounters. However, rare is the knowledge on whether vocal behavior of mice changes under sterilant treatment which will affect gonadal hormone levels. In the present study, we treat male mice with quinestrol, which interferes with the release of the gonadotropin-releasing hormone (GnRH) and has a significant anti-fertility effect in rodents...
February 18, 2017: Physiology & Behavior
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