21,882 results match your criteria jet

Nasal high-frequency jet ventilation (NHFJV) as a novel means of respiratory support in extremely low birth weight infants.

J Perinatol 2021 Jun 14. Epub 2021 Jun 14.

Division of Neonatology, Department of Pediatrics, LAC+USC Medical Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.

Objective: Describe our experience of successfully using nasal high-frequency jet ventilation (NHFJV) in extremely low birth weight infants with respiratory failure.

Study Design: A retrospective review was conducted on 16 infants with birth weights <1000 g who received NHFJV from 2015 to 2019. Successful use was defined as avoiding intubation for at least 72 hours and demonstrating tolerance after being placed on NHFJV. Read More

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Effects of air-impingement jet drying on drying kinetics and quality retention of tomato slices.

Food Sci Biotechnol 2021 May 27;30(5):691-699. Epub 2021 Mar 27.

School of Advanced Agriculture and Bioengineering, Yangtze Normal University, Chongqing, 408100 China.

The purpose was to explore the drying kinetics, the moisture effective diffusivities, color, total polyphenols, lycopene and antioxidant activities of dried tomato slices by air-impingement jet drying (AIJD). The results showed that high temperature increased the drying rate, and Modified Page model accurately predicted the AIJD characteristics of tomato slices. AIJD is better than hot air drying in shortening drying time, enhancing drying rate and decreasing the loss of total polyphenols, lycopene and antioxidant capacity of tomato slices. Read More

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Impact of different nebulizers' connections on aerosol therapy.

Int J Clin Pract 2021 Jun 12:e14493. Epub 2021 Jun 12.

Clinical Pharmacy Department, Faculty of Pharmacy, Beni-suef University, Beni-suef, Egypt.

Background: Aerosol therapy has the advantage of a higher safety due to the local deposition of inhaled medication to the lung, however, the main drawback is the low and variable amount of delivered drug to patients. Hence, this study aimed to investigate the effect of different accessory connections on aerosol delivery from different nebulizers.

Method: this study consisted of three main models in-vitro, in vivo, and ex-vivo models. Read More

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Development of a pilot-scale HuskyJet binder jet 3D printer for additive manufacturing of pharmaceutical tablets.

Int J Pharm 2021 Jun 9;605:120791. Epub 2021 Jun 9.

Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06084, USA; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06084, USA. Electronic address:

This paper reports a custom-built binder jet 3D printer for pilot-scale manufacturing of pharmaceutical tablets. The printer is equipped with high-throughput piezoelectric inkjet print heads and allows direct control of several key process parameters, including the build layer thickness, amount of jetted liquid binder, and powder spreading rate. The effects of these parameters on the properties of the as-printed tablets were studied using a powder mixture of lactose monohydrate and Kollidon® VA64 (KL) and an aqueous binder containing 5% of KL. Read More

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Role of Interfacial Tension on Viscous Multiphase Flows in Coaxial Microfluidic Channels.

Langmuir 2021 Jun 11. Epub 2021 Jun 11.

Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794, United States.

We experimentally investigate the influence of interfacial tension on liquid/liquid microflows for fluids having large viscosity contrasts. A coaxial microdevice is employed to examine the situation where a less-viscous fluid is injected in a sheath of a more-viscous fluid using both immiscible and miscible fluid pairs. Data obtained from high-speed imaging reveal a variety of regular flow regimes, including dripping, jetting, wavy, core-annular, diffusive jet, mist, and inverted thread flow patterns. Read More

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Safety evaluation of atmospheric pressure plasma jets in and experiments.

J Periodontal Implant Sci 2021 Jun;51(3):213-223

Department of Periodontology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.

Purpose: The atmospheric pressure plasma jet (APPJ) has been introduced as an effective disinfection method for titanium surfaces due to their massive radical generation at low temperatures. Helium (He) has been widely applied as a discharge gas in APPJ due to its bactericidal effects and was proven to be effective in our previous study. This study aimed to evaluate the safety and effects of He-APPJ application at both the cell and tissue levels. Read More

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Efficacy of glycine powder air-polishing in supportive periodontal therapy: a systematic review and meta-analysis.

J Periodontal Implant Sci 2021 Jun;51(3):147-162

College of Stomatology, Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China.

Purpose: This systematic review and meta-analysis was conducted to assess the effects of glycine powder air-polishing (GPAP) in patients during supportive periodontal therapy (SPT) compared to hand instrumentation and ultrasonic scaling.

Methods: The authors searched for randomized clinical trials in 8 electronic databases for relevant studies through November 15, 2019. The eligibility criteria were as follows: population, patients with chronic periodontitis undergoing SPT; intervention and comparison, patients treated by GPAP with a standard/nozzle type jet or mechanical instrumentation; and outcomes, bleeding on probing (BOP), patient discomfort/pain (assessed by a visual analogue scale [VAS]), probing depth (PD), gingival recession (Rec), plaque index (PI), clinical attachment level (CAL), gingival epithelium score, and subgingival bacteria count. Read More

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Invasive validation of the left ventricular global longitudinal strain for estimating left ventricular filling pressure.

Echocardiography 2021 Jun 10. Epub 2021 Jun 10.

Department of Cardiovascular Medicine, Ankara University School of Medicine, Ankara, Turkey.

Purpose: An elevated left ventricular (LV) filling pressure is the main finding in heart failure patients with preserved ejection fraction, which is estimated with an algorithm using echocardiographic parameters recommended by the recent American Society of Echocardiography (ASE)/European Association of Cardiovascular Imaging (EACVI) guidelines. In this study, we sought to determine the efficacy of the LV global longitudinal strain (GLS) in predicting an elevated LV filling pressure.

Methods And Results: A total of 73 prospectively selected patients undergoing LV catheterization (mean age 63. Read More

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In vitro delivery efficiencies of nebulizers for different breathing patterns.

Biomed Eng Online 2021 Jun 10;20(1):59. Epub 2021 Jun 10.

Department of Medical Engineering, Dongguk University College of Medicine, Goyang, South Korea.

Background: Nebulizers are medical devices that deliver aerosolized medication directly to lungs to treat a variety of respiratory diseases. However, breathing patterns, respiration rates, airway diameters, and amounts of drugs delivered by nebulizers may be respiratory disease dependent.

Method: In this study, we developed a respiratory simulator consisting of an airway model, an artificial lung, a flow sensor, and an aerosol collecting filter. Read More

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4D printing: Perspectives for the production of sustainable plastics for agriculture.

Biotechnol Adv 2021 Jun 8:107785. Epub 2021 Jun 8.

Farm Structures Lab., Department of Natural Resources and Agricultural Engineering, Agricultural University of Athens, Greece.

The concept of 4D printing of phase change materials is gaining attention in the potential development of self-healing materials for tissue engineering and manufacturing applications, but there has been limited utilization of the technology in agriculture/farm-based applications. The temperature-responsiveness, magneto-responsiveness, pH-responsiveness, and osmotic pressure-responsiveness of shape-memory materials have potential applications in green/compostable plastics for agricultural applications such as food packaging and mulching films, shade nets, and greenhouse polymer covers. The application of 4D printing in augmenting the biodegradability, environmental, economic, and production benefits of polymers in agriculture is the main focus of this review. Read More

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Case report: iatrogenic left ventricular outflow tract to right atrium fistula after trans-femoral transcatheter aortic valve implantation associated with asymmetric septal hypertrophy.

Eur Heart J Case Rep 2021 Mar 10;5(3):ytab020. Epub 2021 Mar 10.

Department of Cardiology, University Hospital of Brest, Tanguy Prigent Boulevard, 29609 Brest Cedex, France.

Background : The transcatheter aortic valve implantation (TAVI) is becoming a leading treatment option for symptomatic aortic stenosis for patients in all surgical risk categories. Recognition and management of potential complications are essential to ensure patient life and comfort. We present here a case report of a left ventricular outflow tract (LVOT) to right atrium (RA) fistula which is an extremely rare complication after TAVI. Read More

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Global tropospheric ozone responses to reduced NO emissions linked to the COVID-19 worldwide lockdowns.

Sci Adv 2021 06 9;7(24). Epub 2021 Jun 9.

Royal Netherlands Meteorological Institute, De Bilt, Netherlands.

Efforts to stem the transmission of coronavirus disease 2019 (COVID-19) led to rapid, global ancillary reductions in air pollutant emissions. Here, we quantify the impact on tropospheric ozone using a multiconstituent chemical data assimilation system. Anthropogenic NO emissions dropped by at least 15% globally and 18 to 25% regionally in April and May 2020, which decreased free tropospheric ozone by up to 5 parts per billion, consistent with independent satellite observations. Read More

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High-Frequency Jet Ventilation in Infants with Congenital Heart Disease.

Respir Care 2021 Jun 9. Epub 2021 Jun 9.

Duke Children's Hospital, Division of Pediatric Critical Care Medicine, Durham, NC.

High-frequency jet ventilation (HFJV) is primarily used in neonates but may also have a role in the treatment of infants with congenital heart disease and severe respiratory failure. We hypothesized HFJV would result in improved gas exchange in these infants. We retrospectively reviewed the records of all pediatric subjects with complex congenital heart disease treated HFJV in the pediatric cardiac ICU between 2014 and 2018. Read More

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Hemolysis estimation in turbulent flow for the FDA critical path initiative centrifugal blood pump.

Biomech Model Mechanobiol 2021 Jun 9. Epub 2021 Jun 9.

School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, 73019, USA.

Hemolysis in medical devices and implants has been a primary concern over the past fifty years. Turbulent flow in particular can cause cell trauma and hemolysis in such devices. In this work, the effects of turbulence on red blood cell (RBC) damage are examined by simulating the flow field through a centrifugal blood pump that has been identified as a case study through the critical path initiative of the US Food and Drug Administration (FDA). Read More

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A carbazole compound, 9-ethyl-9H-carbazole-3-carbaldehyde, plays an antitumor function through reactivation of the p53 pathway in human melanoma cells.

Cell Death Dis 2021 Jun 8;12(6):591. Epub 2021 Jun 8.

Department of Tissue Engineering and Regeneration, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China.

p53, the major tumor suppressor, is frequently mutated in many cancers, and up to 84% of human melanomas harbor wild-type p53, which is considered to be an ideal target for melanoma therapy. Here, we evaluated the antitumor activity of a carbazole derivative, 9-ethyl-9H-carbazole-3-carbaldehyde (ECCA), on melanoma cells. ECCA had a selectively strong inhibitory activity against the growth of BRAF-mutated and BRAF-wild-type melanoma cells but had little effect on normal human primary melanocytes. Read More

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Green electrospinning for biomaterials and biofabrication.

Biofabrication 2021 Jun 8. Epub 2021 Jun 8.

Department of Biomedical Engineering, Columbia University Fu Foundation School of Engineering and Applied Science, 351 Engineering Terrace, 1210 Amsterdam Avenue, New York, NY 10027, USA, New York, New York, 10027, UNITED STATES.

Green manufacturing has emerged across industries, propelled by a growing awareness of the negative environmental and health impacts associated with traditional practices. In the biomaterials industry, electrospinning is a ubiquitous fabrication method for producing nano- to micro-scale fibrous meshes that resemble native tissues, but this process traditionally utilizes solvents that are environmentally hazardous and pose a significant barrier to industrial scale-up and clinical translation. Applying sustainability principles to biomaterial production, we have developed a "green electrospinning" process by systematically testing biologically benign solvents (U. Read More

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Perfluoroalkylated acids (PFAAs) accumulate in field-exposed snails (Cepaea sp.) and affect their oxidative status.

Sci Total Environ 2021 May 27;790:148059. Epub 2021 May 27.

Systemic Physiological and Ecotoxicologal Research (SPHERE), Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; Behavioural Ecology and Ecophysiology Group (BECO), Department of Biology, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium. Electronic address:

Perfluoroalkyl acids (PFAAs) are a group of synthetic persistent chemicals with distinctive properties, such as a high thermal and chemical stability, that make them suitable for a wide range of applications. They have been produced since the 1950s, resulting in a global contamination of the environment and wildlife. They are resistant to biodegradation and have the tendency to bio-accumulate in organisms and bio-magnify in the food chain. Read More

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Convergence of Machine Vision and Melt Electrowriting.

Adv Mater 2021 Jun 8:e2100519. Epub 2021 Jun 8.

Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, 4059, Australia.

Melt electrowriting (MEW) is a high-resolution additive manufacturing technology that balances multiple parametric variables to arrive at a stable fabrication process. The better understanding of this balance is underscored here using high-resolution camera vision of jet stability profiles in different electrical fields. Complementing this visual information are fiber-diameter measurements obtained at precise points, allowing the correlation to electrified jet properties. Read More

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Optimization of light exposure and sleep schedule for circadian rhythm entrainment.

PLoS One 2021 8;16(6):e0251478. Epub 2021 Jun 8.

Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America.

The circadian rhythm, called Process C, regulates a wide range of biological processes in humans including sleep, metabolism, body temperature, and hormone secretion. Light is the dominant synchronizer of the circadian rhythm-it has been used to regulate the circadian phase to cope with jet-lag, shift work, and sleep disorder. The homeostatic oscillation of the sleep drive is called Process S. Read More

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Observation of vibronic emission spectrum of jet-cooled 3-chloro-4-fluorobenzyl radical.

Gi Woo Lee

Spectrochim Acta A Mol Biomol Spectrosc 2021 May 26;261:120001. Epub 2021 May 26.

Inorganic Material Team, Chemical Development Group, Dongwoo Fine-chem, Iksansi, Jeonrabukdo, Republic of Korea. Electronic address:

We observed the vibronic emission spectrum of 3-chloro-4-fluorobenzyl radical using a corona-excited supersonic jet expansion (CESE) from the precursor 3-chloro-4-fluorotoluene. From an analysis of the observed spectrum, we investigate the formation of the 3-chloro-4-fluorobenzyl and 4-fluorobenzyl radicals and explained the reaction paths with an ab initio study. The D → D transition energy and the frequencies of vibrational mode of the 3-chloro-4-fluorobenzyl radical were determined with a Franck-Condon simulation from density functional theory calculations in the D and D states. Read More

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Proton Transfer in a Bare Superacid-Amine Complex: A Microwave and Computational Study of Trimethylammonium Triflate.

J Phys Chem A 2021 Jun 7;125(23):5061-5068. Epub 2021 Jun 7.

Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States.

The complex formed from trimethylamine ((CH)N) and trifluoromethanesulfonic acid (triflic acid, CFSOH) has been observed by Fourier transform microwave spectroscopy in a supersonic jet. Spectroscopic data, most notably N nuclear quadrupole coupling constants, are combined with computational results at several levels of theory to unambiguously demonstrate complete or near-complete proton transfer from the triflic acid to the trimethylamine upon complexation. Thus, the system is best regarded as a trimethylammonium triflate ion pair in the gas phase. Read More

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Performance comparison of ejectors in ejector-based refrigeration cycles with R1234yf, R1234ze(E) and R134a.

Environ Sci Pollut Res Int 2021 Jun 4. Epub 2021 Jun 4.

School of Energy and Power Engineering, Shandong University, Jinan, 266237, China.

To look for new refrigerants replacing R134a, environmentally friendly refrigerants R1234yf and R1234ze(E) were chosen as the alternatives in an ejector refrigeration system. The tested system contained a single-phase ejector, and numerical analysis regarding the performance of the ejector was done by CFD. The entrainment ratio, static pressure and Mach number were chosen as indicators revealing the ejector performance. Read More

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Experimental observation of asymmetrical microwave jets and far-field distribution generated by a dual-material system.

Sci Rep 2021 Jun 4;11(1):11871. Epub 2021 Jun 4.

InterDigital R&D France, 975 Avenue des Champs Blancs, 35576, Cesson Sévigné, France.

In this paper, we report the experimental and numerical investigation of plane wave diffraction by an all-dielectric dual-material cuboid. Edge diffraction by a cuboid leads to the generation of a narrow, high intensity beam in the near-field region called a photonic jet. We examine the dependence of the jet behavior and orientation on the materials and dimensions of constitutive parts in the microwave frequency domain. Read More

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Five years of innovations in development of glow discharges generated in contact with liquids for spectrochemical elemental analysis by optical emission spectrometry.

Anal Chim Acta 2021 Jul 13;1169:338399. Epub 2021 Mar 13.

Wroclaw University of Science and Technology, Faculty of Chemistry, Department of Analytical Chemistry and Chemical Metallurgy, Wyspianskiego 27, 50370 Wroclaw, Poland.

The newest achievements in the field of glow microdischarges generated in contact with a flowing liquid cathode (FLC) and a flowing liquid anode (FLA), used as the excitation sources for optical emission spectrometry (OES), were summarized herein. The design of recently reported discharge systems was compared and comprehensively discussed. A lot of effort was devoted to evaluate the effect of selected operating parameters, i. Read More

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Building bimodal structures by a wettability difference-driven strategy for high-performance protein air-filters.

J Hazard Mater 2021 08 25;415:125742. Epub 2021 Mar 25.

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA. Electronic address:

Building bimodal structures for air-filters is promising to reduce the airflow resistance without sacrificing the filtration efficiency. To do so, multi-jet electrospinning is among the most broadly used methods, yet the interplay between single fibers in electrospinning, which is significant to their morphologies, is overlooked. In this study, we report a wettability difference-driven strategy to fabricate a bimodal protein fabric with superior filtration performance. Read More

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Needle-free injection: Dental infiltration anesthesia.

Int J Pharm 2021 Jun 1;604:120765. Epub 2021 Jun 1.

College of Dental Medicine, QU Health, Qatar University, Doha, Qatar. Electronic address:

This study aimed to develop an optimal Needle-Free Liquid Jet Injection (NFLJI) technique for dental infiltration anesthesia and evaluate its clinical safety and feasibility. The fluid dynamics of NFLJI in the dentoalveolar region were investigated using soft tissue phantoms supported by rigid glass. NFLJIs were performed at different incident angles and recorded using a high-speed camera. Read More

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A complex of LaoA and LaoB acts as a Tat-dependent dehydrogenase for long-chain alcohols in .

Appl Environ Microbiol 2021 Jun 4:AEM0076221. Epub 2021 Jun 4.

Westfälische Wilhelms-Universität Münster, Institut für Molekulare Mikrobiologie und Biotechnologie, Corrensstr. 3, 48149 Münster, Germany.

The opportunistic pathogen can utilize unusual carbon sources like sodium dodecyl sulfate (SDS) and alkanes. Whereas the initiating enzymatic steps of the corresponding degradation pathways have been characterized in detail, the oxidation of the emerging long-chain alcohols found little attention. Recently, the genes for the Lao (ong-chain lcohol/ldehyde xidation) system were discovered to be involved in the oxidation of long-chain alcohols derived from SDS and alkane degradation. Read More

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Pyrolysis and Combustion Chemistry of Pyrrole, a Reference Component for Bio-oil Surrogates: Jet-Stirred Reactor Experiments and Kinetic Modeling.

Energy Fuels 2021 May 2;35(9):7265-7284. Epub 2021 Mar 2.

Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, ENSIC, 54001 Nancy Cedex, France.

Fast-pyrolysis bio-oils (FPBOs) obtained from lignocellulosic biomass are gaining attention as sustainable fuels for various applications, including the transport sector and power production. A significant fraction of bio-oils is constituted by nitrogen-containing compounds (N fuels) that should be considered when developing surrogate models for FPBOs. Moreover, the content of N fuels in FPBOs is expected to strongly contribute to the production of nitrogen oxides (NO ) directly from fuel-bound nitrogen (fuel NO ), in addition to the thermal NO formation pathways typical of high-temperature combustion conditions. Read More

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Moderate Aortic Stenosis in Patients With Heart Failure and Reduced Ejection Fraction.

J Am Coll Cardiol 2021 Jun;77(22):2796-2803

Institut universitaire de cardiologie et de pneumologie, Université Laval, Québec, Québec, Canada. Electronic address:

Background: The study investigators previously reported that moderate aortic stenosis (AS) is associated with a poor prognosis in patients with heart failure (HF) with reduced left ventricular ejection fraction (LVEF) (HFrEF). However, the respective contribution of moderate AS versus HFrEF to the outcomes of these patients is unknown.

Objectives: This study sought to determine the impact of moderate AS on outcomes in patients with HFrEF. Read More

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