4,085 results match your criteria tube transport


Effect of Size and Temperature on Water Dynamics inside Carbon Nano-Tubes Studied by Molecular Dynamics Simulation.

Molecules 2021 Oct 13;26(20). Epub 2021 Oct 13.

Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates.

Water transport inside carbon nano-tubes (CNTs) has attracted considerable attention due to its nano-fluidic properties, its importance in nonporous systems, and the wide range of applications in membrane desalination and biological medicine. Recent studies show an enhancement of water diffusion inside nano-channels depending on the size of the nano-confinement. However, the underlying mechanism of this enhancement is not well understood yet. Read More

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October 2021

Dose Response of Bumetanide on Aquaporins and Angiogenesis Biomarkers in Human Retinal Endothelial Cells Exposed to Intermittent Hypoxia.

Pharmaceuticals (Basel) 2021 Sep 24;14(10). Epub 2021 Sep 24.

Department of Pediatrics, Division of Neonatal-Perinatal Medicine, State University of New York, Downstate Medical Center, Brooklyn, NY 11203, USA.

Aquaporins (AQPs) are important for regulating cellular water, solute transport, and balance. Recently, AQPs have also been recognized as playing a key role in cell migration and angiogenesis. In the retina, hypoxia induces vascular endothelial growth factor (VEGF), a potent angiogenic and vascular permeability factor, resulting in retinal edema, which is facilitated by AQPs. Read More

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September 2021

Validation of a deterministic linear Boltzmann transport equation solver for rapid CT dose computation using physical dose measurements in pediatric phantoms.

Med Phys 2021 Oct 20. Epub 2021 Oct 20.

Department of Biomedical Engineering, Medical College of Wisconsin and Marquette University, Milwaukee, WI, 53201, USA.

Purpose: The risk of inducing cancer to patients undergoing CT examinations has motivated efforts for CT dose estimation, monitoring and reduction, especially among pediatric population. The method investigated in this study is Acuros CTD (Varian Medical Systems, Palo Alto, CA), a deterministic linear Boltzmann transport equation (LBTE) solver aimed at generating rapid and reliable dose maps of CT exams. By applying organ contours, organ doses can also be obtained, thus patient-specific organ dose estimates can be provided. Read More

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October 2021

Molecular Insight into the Effect of a Single-Nucleotide Polymorphic Variation on the Structure and Dynamics of Methionine Synthase Reductase and Its Association with Neural Tube Defects.

ACS Omega 2021 Oct 30;6(40):26372-26380. Epub 2021 Sep 30.

Department of Zoology, University of Calcutta, Kolkata, 700019 India.

Neural tube defects (NTDs) are among the common and severe congenital malformations in neonates. According to a WHO report, nearly three lakh babies are affected per year worldwide by NTDs. Most studies revealed that folate deficiency is the key element to promote NTD with other oligogenic and multifactorial elements. Read More

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October 2021

Proteomic Analysis Reveals Sex-Specific Protein Degradation Targets in the Amygdala During Fear Memory Formation.

Front Mol Neurosci 2021 29;14:716284. Epub 2021 Sep 29.

Department of Animal and Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States.

Ubiquitin-proteasome mediated protein degradation has been widely implicated in fear memory formation in the amygdala. However, to date, the protein targets of the proteasome remain largely unknown, limiting our understanding of the functional significance for protein degradation in fear memory formation. Additionally, whether similar proteins are targeted by the proteasome between sexes has yet to be explored. Read More

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September 2021

Monte Carlo modelling of an x-ray chamber for providing inactivation exposures to viruses.

J Radiol Prot 2021 Oct 13. Epub 2021 Oct 13.

Public Health England National Infection Service, Porton Down, Salisbury, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

The Monte Carlo radiation transport code MCNP6 has been used to model dosimetry for biological pathogen samples placed within a MultiRad 225 irradiation chamber, in order to inform virus deactivation protocols. Full characterizations of the photon spectra generated by the chamber's X-ray tube were achieved for both 190 kV and 220 kV potentials, with and without aluminium and copper beam filters of different thicknesses. Dose rate maps to air and water within the chamber were then derived, along with corresponding conversion coefficient data. Read More

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October 2021

Long-Term Performance of Distributed Optical Fiber Sensors Embedded in Reinforced Concrete Beams under Sustained Deflection and Cyclic Loading.

Sensors (Basel) 2021 Sep 22;21(19). Epub 2021 Sep 22.

Division of Structural Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden.

This paper explores the performance of distributed optical fiber sensors based on Rayleigh backscattering for the monitoring of strains in reinforced concrete elements subjected to different types of long-term external loading. In particular, the reliability and accuracy of robust fiber optic cables with an inner steel tube and an external protective polymeric cladding were investigated through a series of laboratory experiments involving large-scale reinforced concrete beams subjected to either sustained deflection or cyclic loading for 96 days. The unmatched spatial resolution of the strain measurements provided by the sensors allows for a level of detail that leads to new insights in the understanding of the structural behavior of reinforced concrete specimens. Read More

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September 2021

Impact of centrifugation time and pneumatic tube transport on plasma concentrations of direct oral anticoagulants.

Int J Lab Hematol 2021 Oct 12. Epub 2021 Oct 12.

Department of Clinical Biochemistry, Aarhus University Hospital, Aarhus, Denmark.

Introduction: Rapid results are needed when plasma concentrations of direct oral anticoagulants (DOACs) are required in acute clinical settings. We evaluated the impact of centrifugation time and pneumatic tube transport on DOAC plasma concentrations with the overall aim of reducing turnaround time.

Methods: Blood samples were spiked with rivaroxaban, apixaban or dabigatran in a low and a high concentration prior to centrifugation for 25 minutes (3163 g) or 5 minutes (3000 g) (n = 20 for each DOAC). Read More

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October 2021

Well-defined hollow [email protected] NiCoS core-shell nanoarrays for ultrahigh capacitance supercapacitor.

Dalton Trans 2021 Oct 6. Epub 2021 Oct 6.

State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.

Reasonable design of electrodes with well-defined nanostructure is the central aspect in the practical application of high-performance supercapacitors. Herein, hollow [email protected] NiCoS core-shell nanoarrays are rationally constructed to the free-standing electrode by growing ZIF-67 on Co-precursor nanorods array and sequentially performing anion-exchange (S) and cation-exchange (Ni). The well-defined nanostructures can shorten the ion transport path in the charging-discharging process, increase the specific surface area and electrochemical active cites, which help in improving electrochemical performance. Read More

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October 2021

[Thirty-six critical cases of emergency helicopter transferring between hospitals].

Zhonghua Wei Zhong Bing Ji Jiu Yi Xue 2021 Aug;33(8):1003-1006

Institute of Disaster and Emergency Medicine of Tianjin University, Tianjin 300384, China. Corresponding author: Zhao Huimin, Email:

Objective: To summarize critical cases of emergency helicopter transferring between hospitals and improve the quality and safety of critical care.

Methods: The task records of Guangxi Aviation Medical Rescue Training Base from September 2017 to September 2020 were retrieved. The mission acceptance, implementation results, disease spectrum composition, pre-transfer preparation and medical intervention on board were summarized. Read More

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International Council for Standardization in Haematology (ICSH) recommendations for processing of blood samples for coagulation testing.

Int J Lab Hematol 2021 Sep 27. Epub 2021 Sep 27.

Christian Medical College, Vellore, India.

This guidance document has been prepared on behalf of the International Council for Standardization in Haematology (ICSH). The aim of the document is to provide guidance and recommendations for the processing of citrated blood samples for coagulation tests in clinical laboratories in all regions of the world. The following areas are included in this document: Sample transport including use of pneumatic tubes systems; clots in citrated samples; centrifugation; primary tube storage and stability; interfering substances including haemolysis, icterus and lipaemia; secondary aliquots-transport, storage and processing; preanalytical variables for platelet function testing. Read More

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September 2021

Carbon and Neon Ion Bombardment Induced Smoothing and Surface Relaxation of Titania Nanotubes.

Nanomaterials (Basel) 2021 Sep 21;11(9). Epub 2021 Sep 21.

Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, 04318 Leipzig, Germany.

Titania nanotube arrays with their enormous surface area are the subject of much attention in diverse fields of research. In the present work, we show that not only 60 keV and 150 keV ion bombardment of amorphous titania nanotube arrays yields defect creation within the tube walls, but it also changes the surface morphology: the surface relaxes and smoothens in accordance with a curvature-driven surface material's transport mechanism, which is mediated by radiation-induced viscous flow or radiation-enhanced surface diffusion, while the nanotubes act as additional sinks for the particle surface currents. These effects occur independently of the ion species: both carbon and neon ion bombardments result in comparable surface relaxation responses initiated by an ion energy of 60 keV at a fluence of 1 × 1016 ions/cm2. Read More

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September 2021

Independent Lung Ventilation-Experimental Studies on a 3D Printed Respiratory Tract Model.

Materials (Basel) 2021 Sep 9;14(18). Epub 2021 Sep 9.

Faculty of Chemical and Process Engineering, Warsaw University of Technology, Waryńskiego 1, 00-645 Warsaw, Poland.

Independent lung ventilation (ILV) is a life-saving procedure in unilateral pulmonary pathologies. ILV is underused in clinical practice, mostly due to the technically demanding placement of a double lumen endotracheal tube (ETT). Moreover, the determination of ventilation parameters for each lung in vivo is limited. Read More

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September 2021

Integrated impedance sensing of liquid sample plug flow enables automated high throughput NMR spectroscopy.

Microsyst Nanoeng 2021 14;7:30. Epub 2021 Apr 14.

Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

A novel approach for automated high throughput NMR spectroscopy with improved mass-sensitivity is accomplished by integrating microfluidic technologies and micro-NMR resonators. A flow system is utilized to transport a sample of interest from outside the NMR magnet through the NMR detector, circumventing the relatively vast dead volume in the supplying tube by loading a series of individual sample plugs separated by an immiscible fluid. This dual-phase flow demands a real-time robust sensing system to track the sample position and velocities and synchronize the NMR acquisition. Read More

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Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor.

Membranes (Basel) 2021 Sep 14;11(9). Epub 2021 Sep 14.

Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi 214122, China.

A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. Read More

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September 2021

Radial Flow Perfusion Enables Real-Time Profiling of Cellular Metabolism at Low Oxygen Levels with Hyperpolarized C NMR Spectroscopy.

Metabolites 2021 Aug 26;11(9). Epub 2021 Aug 26.

Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA 19104, USA.

In this study, we describe new methods for studying cancer cell metabolism with hyperpolarized C magnetic resonance spectroscopy (HP C MRS) that will enable quantitative studies at low oxygen concentrations. Cultured hepatocellular carcinoma cells were grown on the surfaces of non-porous microcarriers inside an NMR spectrometer. They were perfused radially from a central distributer in a modified NMR tube (bioreactor). Read More

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Genetic changes involving the coral gastrovascular system support the transition between colonies and bailed-out polyps: evidence from a Pocillopora acuta transcriptome.

BMC Genomics 2021 Sep 26;22(1):694. Epub 2021 Sep 26.

Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Kunigami-gun , 904-0495, Okinawa, Japan.

Background: A coral colony is composed of physiologically integrated polyps. In stony corals, coloniality adopts a wide diversity of forms and involves complex ontogenetic dynamics. However, molecular mechanisms underlying coloniality have been little studied. Read More

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September 2021

Myosin XI-B is involved in the transport of vesicles and organelles in pollen tubes of Arabidopsis thaliana.

Plant J 2021 Sep 24. Epub 2021 Sep 24.

State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.

The movement of organelles and vesicles in pollen tubes depends on F-actin. However, the molecular mechanism through which plant myosin XI drives the movement of organelles is still controversial, and the relationship between myosin XI and vesicle movement in pollen tubes is also unclear. In this study, we found that the siliques of the myosin xi-b/e mutant were obviously shorter than those of the wild-type (WT) and that the seed set of the mutant was severely deficient. Read More

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September 2021

Biomass-derived carbon quantum dots: a novel and sustainable fluorescent "ON-OFF-ON" sensor for ferric ions.

Anal Methods 2021 Oct 21;13(40):4756-4766. Epub 2021 Oct 21.

Laboratory of Nanoscience and Quantum Computations, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar-190006, J&K, India.

Fluorescent carbon dot sensing probes have attracted much attention in recent times due to their amazing properties regarding chemical inertness, solubility, non-toxicity, optoelectronic behavior, and charge transport functionality. Herein, we report the green synthesis of lotus stem-derived carbon dots (LS-CQDs) from the naturally available lotus stem by a simple and economical hydrothermal method without the use of an oxidizing agent. HR-TEM and DLS measurements confirm the quasi-spherical shaped LS-CQDs, with a 2. Read More

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October 2021

Management and referral of acute laryngotracheitis - Croup: The New South Wales Neonatal and Paediatric Emergency Transport Service experience.

J Paediatr Child Health 2021 Sep 15. Epub 2021 Sep 15.

Newborn and Paediatric Emergency Transport Service, Sydney Children's Hospitals Network, Sydney, New South Wales, Australia.

Aim: To evaluate the experience of NETS (The Newborn and paediatric Emergency Transport Service) New South Wales (NSW) with children referred with a provisional diagnosis of croup. To examine the adherence of referral hospitals to NSW Health policy guidelines and to establish criteria for the need to transfer and the level of escort required for a child with croup to a higher level of care.

Methods: A retrospective audit of all children with a provisional diagnosis of croup referred to NETS over the epoch: 2005-2015. Read More

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September 2021

Computational flow analysis of a single peristaltic wave propagation in the ureter.

Comput Methods Programs Biomed 2021 Oct 30;210:106378. Epub 2021 Aug 30.

Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India. Electronic address:

Background And Objective: The bladder receives the urine from the kidney and ureter. The series of peristaltic waves facilitate urine transport to the bladder. The peristaltic flow in the ureter is associated with fluid trapping and material reflux, which may cause an increase in bladder pressure. Read More

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October 2021

Exosomes from adipose-derived stem cells alleviate myocardial infarction via microRNA-31/FIH1/HIF-1α pathway.

J Mol Cell Cardiol 2021 Aug 30;162:10-19. Epub 2021 Aug 30.

Cardiovascular Research Institute, Morehouse School of Medicine, Atlanta, GA, United States of America; Department of Physiology, Morehouse School of Medicine, Atlanta, GA, United States of America. Electronic address:

Our previous study has revealed that exosomes from adipose-derived stem cells (ASCs) promote angiogenesis in subcutaneously transplanted gels by delivery of microRNA-31 (miR-31) which targets factor inhibiting hypoxia-inducible factor-1 (FIH1) in recipient cells. Here we hypothesized that ASC exosomes alleviate ischemic diseases through miR-31/FIH1/hypoxia-inducible factor-1α (HIF-1α) signaling pathway. Exosomes from ASCs were characterized with nanoparticle tracking analysis, transmission electron microscopy, and immunoblotting analysis for exosomal markers. Read More

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pH modulates interaction of 14-3-3s with pollen PM H+ ATPases independently from phosphorylation.

J Exp Bot 2021 Sep 1. Epub 2021 Sep 1.

Membrane Biophysics, Dept. Biosciences, Univ. Salzburg, Billrothstr, Salzburg, Austria.

Pollen grains transport the sperm cells through the style tissue via a fast growing pollen tube to the ovaries where fertilisation takes place. This tube growth process requires a precisely regulated network of cellular as well as molecular courses of events including the activity of the plasma membrane H + ATPase (PM H + ATPase), which is known to be regulated by reversible protein phosphorylation and subsequent binding of 14-3-3 isoforms. Immunodetection of the phosphorylated penultimate threonine residue of the pollen PM H + ATPase LilHA1 of Lilium longiflorum pollen revealed a sudden increase in phosphorylation with the start of pollen tube growth. Read More

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September 2021

Microtubules in insulin action: what's on the tube?

Trends Endocrinol Metab 2021 10 27;32(10):776-789. Epub 2021 Aug 27.

Department of Medicine, Division of Endocrinology, University of Arizona College of Medicine, Tucson, AZ, USA. Electronic address:

Microtubules (MT) have a role in the intracellular response to insulin stimulation and subsequent glucose transport by glucose transporter 4 (GLUT4), which resides in specialized storage vesicles that travel through the cell. Before GLUT4 is inserted into the plasma membrane for glucose transport, it undergoes complex trafficking through the cell via the integration of cytoskeletal networks. In this review, we highlight the importance of MT elements in insulin action in adipocytes through a summary of MT depolymerization studies, MT-based GLUT4 movement, molecular motor proteins involved in GLUT4 trafficking, as well as MT-related phenomena in response to insulin and links between insulin action and MT-associated proteins. Read More

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October 2021

Seasonal patterns of callose deposition and xylem embolism in five boreal deciduous tree species.

Am J Bot 2021 08 27;108(8):1568-1575. Epub 2021 Aug 27.

Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada.

Premise: Phloem tissue allows for sugar transport along the entirety of a plant and, thus, is one of the most important anatomical structures related to growth. It is thought that the sugar-conducting sieve tube may overwinter and that its cells persist multiple seasons in deciduous trees. One possible overwintering strategy is to build up callose on phloem sieve plates to temporarily cease their function. Read More

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Endoglin Is an Endothelial Housekeeper against Inflammation: Insight in ECFC-Related Permeability through LIMK/Cofilin Pathway.

Int J Mol Sci 2021 Aug 17;22(16). Epub 2021 Aug 17.

Faculty of Pharmacy, University of Paris, F-75006 Paris, France.

Endoglin (Eng) is an endothelial cell (EC) transmembrane glycoprotein involved in adhesion and angiogenesis. Eng mutations result in vessel abnormalities as observed in hereditary hemorrhagic telangiectasia of type 1. The role of Eng was investigated in endothelial functions and permeability under inflammatory conditions, focusing on the actin dynamic signaling pathway. Read More

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Folate Receptor Alpha Autoantibodies in Autism Spectrum Disorders: Diagnosis, Treatment and Prevention.

J Pers Med 2021 Jul 24;11(8). Epub 2021 Jul 24.

Department of Medicine, SUNY Downstate Medical Center, Brooklyn, NY 11203, USA.

Folate deficiency and folate receptor autoimmune disorder are major contributors to infertility, pregnancy related complications and abnormal fetal development including structural and functional abnormalities of the brain. Food fortification and prenatal folic acid supplementation has reduced the incidence of neural tube defect (NTD) pregnancies but is unlikely to prevent pregnancy-related complications in the presence of folate receptor autoantibodies (FRAb). In pregnancy, these autoantibodies can block folate transport to the fetus and in young children, folate transport to the brain. Read More

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Salbutamol Transport and Deposition in the Upper and Lower Airway with Different Devices in Cats: A Computational Fluid Dynamics Approach.

Animals (Basel) 2021 Aug 18;11(8). Epub 2021 Aug 18.

Department of Engineering, Public University of Navarre (UPNA), Campus Arrosadía s/n, 31006 Pamplona, Spain.

Pressurized metered-dose inhalers (pMDI) with or without spacers are commonly used for the treatment of feline inflammatory airway disease. During traditional airways treatments, a substantial amount of drugs are wasted upstream of their target. To study the efficiency of commonly used devices in the transport of inhaled salbutamol, different computational models based on two healthy adult client-owned cats were developed. Read More

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Conjugate buoyant convective transport of nanofluids in an enclosed annular geometry.

Sci Rep 2021 Aug 24;11(1):17122. Epub 2021 Aug 24.

Department of Mathematics, KNU-Center for Nonlinear Dynamics, Kyungpook National University, Daegu, 41566, Republic of Korea.

A vertical annular configuration with differently heated cylindrical surfaces and horizontal adiabatic boundaries is systematically studied in view to their industrial applications. In this paper, we investigate the effects of conjugate buoyant heat transport in water based nanofluids with different nanoparticles such as alumina, titania or copper, and is filled in the enclosed annular gap. The annulus space is formed by a thick inner cylinder having a uniform high temperature, an exterior cylindrical tube with a constant lower temperature, and thermally insulated upper and lower surfaces. Read More

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Embedding Cobalt Atom Clusters in CNT-Wired MoS Tube-in-Tube Nanostructures with Enhanced Sulfur Immobilization and Catalyzation for Li-S Batteries.

Small 2021 Oct 21;17(39):e2102710. Epub 2021 Aug 21.

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225002, P. R. China.

Lithium-sulfur batteries are one of the most promising next-generation energy storage systems. The efficient interconversion between sulfur/lithium polysulfides and lithium sulfide is a performance-determining factor for lithium-sulfur batteries. Herein, a novel strategy to synthesize a unique tube-in-tube CNT-wired sulfur-deficient MoS nanostructure embedding cobalt atom clusters as an efficient polysulfide regulator is successfully conducted in Li-S batteries. Read More

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October 2021