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15:20 EST 13th December 2018 | BioPortfolio

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Showing "Cells walk liquids like geckos" PubMed Articles 1–25 of 22,000+

Parameters that remain consistent independent of pausing before gait-initiation during normal rise-to-walk behaviour delineated by sit-to-walk and sit-to-stand-and-walk.

Rising-to-walk is an everyday transitional movement task rarely employed in gait rehabilitation. Sit-to-walk (STW) and sit-to-stand-and-walk (STSW), where a pause separates sit-to-stand and gait-initiation (GI) represent extremes of rising-to-walk behaviour. Delayed GI can indicate pathological impairment but is also observed in healthy individuals. We hypothesise that healthy subjects express consistent biomechanical parameters, among others that differ, during successful rising-to-walk task performance re...

Reliability, validity and minimal detectable change of 2-minute walk test, 6-minute walk test and 10-meter walk test in frail older adults with dementia.

Walk tests are commonly used to evaluate walking ability in frail older adults with dementia but their psychometric evidence in this population is lacking.

Dynamic behavior of nanoscale liquids in graphene liquid cells revealed by in situ transmission electron microscopy.

Recent advances in graphene liquid cells for in situ transmission electron microscopy (TEM) have opened many opportunities for the study of materials transformations and chemical reactions in liquids with high spatial resolution. However, the behavior of thin liquids encapsulated in a graphene liquid cell has not been fully understood. Here, we report real time TEM imaging of the nanoscale dynamic behavior of liquids in graphene nanocapillaries. Our observations reveal that the interfaces between liquid and...

Molecular mechanisms of non-thermal plasma-induced effects in cancer cells.

Plasma is the fourth state of matter with higher energy than gas; non-thermal plasma (NTP) is currently available. As NTP is useful in sterilization, promoting wound healing and cancer treatments, the molecular mechanisms of plasma-induced effects in living cells and microorganisms are of significant interest in plasma medicine with medical-engineering collaboration. Molecular mechanisms of plasma-induced effects in cancer cells will be described in this minireview. Both direct and indirect methods to treat...

Two-minute walk test: Reference equations for healthy adults in China.

Although the six-minute walk test (6MWT) is widely used as a measure of exercise capacity, it may not be applicable in some settings and populations. This issue has led to increased use of the two-minute walk test (2MWT) to assess exercise capacity. The main objective of this study is to establish reference equations for the two-minute walk distance (2MWD) in healthy Chinese adults aged 18-85 years.

Developing Viscosity Modelling for Traditional Liquids in Egypt.

The aim of this study was to develop a low-cost methodology for preparing different thickened liquids with different consistencies and viscosities that mimic the viscosities of culturally relevant traditional Egyptian liquids, which can be easily used in the fiberoptic-endoscopic evaluation of swallowing.

Free-base nicotine determination in electronic cigarette liquids by H NMR spectroscopy.

E-liquids usually contain significant nicotine, which will exist primarily in two forms, monoprotonated and free-base the proportions are alterable through the effective pH of the medium. The fraction of nicotine in the free-base form is α, with 0 < α < 1. When dosed via aerosol, the two nicotine forms have different mechanisms and kinetics of delivery, as well as differing implications for harshness of the inhaled aerosol, so αfb is relevant regarding abuse liability. Previous attempts to determine α i...

Ectonucleotidase inhibitory and redox activity of imidazole-based organic salts and ionic liquids.

Cytotoxicity against cancerous and normal cells, inhibition of ectonucleotidase, and redox properties of a new group of imidazole-based organic salts and ionic liquids have been explored. The tetrachloroferrate salt of a 1-methylimidazole derivative of salicylic aldehyde has been shown to have most prominent inhibitory activity against ectonucleotidase, as well as a higher cytotoxicity against HeLa cells than that of the reference compound carboplatin, while having lower cytotoxicity towards BHK-21 cells. T...

Stimulus effects of propylene glycol and vegetable glycerin in electronic cigarette liquids.

Little is known about the behavioral effects of non-nicotine ingredients in electronic cigarette liquids. Propylene glycol (PG) and vegetable glycerin (VG) are the most common humectants used in electronic cigarette liquids. These ingredients may influence stimulus effects (e.g., visibility of exhalant, taste, or smell), which have played a role in the abuse liability of conventional cigarettes. In the current study, the stimulus effects of aerosol from liquids varying only in PG and VG content were assesse...

Rheology of the λ transition in liquid sulfur: Insights from arsenic sulfide liquids.

The frequency dependence of the storage and loss shear moduli and viscosity of AsS glass-forming liquids (x = 5, 10, 15, 40) are obtained over a frequency range covering nearly 15 orders of magnitude using parallel plate rheometry. The S-rich (x ≤ 15) liquids are characterized by a ring-to-chain structural transition near T ∼ 120 °C, and their rheological behavior below T strongly resembles that of long-chain and entangled polymers as well as that recently speculated for liquid sulfur above its λ tran...

The Anionic Surfactant/Ionic Liquids Intercalated Reduced Graphene Oxide for High-performance Supercapacitors.

The thermally reduced graphene oxide (TRG) composites with various interlayer distances were synthesized. These TRG sheets are intercalated with anionic surfactant sodium dodecyl sulfate (SDS) to prevent the restacking between TRG sheets. A facile approach is employed to enlarge the interlayer distance between the TRG sheets by the Coulomb force interaction between the intercalated surfactants and the ionic liquids. A systematic investigation of the morphology and the electrical performances of these EDLC c...

Cariogenic potential of sweet flavors in electronic-cigarette liquids.

Most electronic-cigarette liquids contain propylene glycol, glycerin, nicotine and a wide variety of flavors of which many are sweet. Sweet flavors are classified as saccharides, esters, acids or aldehydes. This study investigates changes in cariogenic potential when tooth surfaces are exposed to e-cigarette aerosols generated from well-characterized reference e-liquids with sweet flavors.

Modulating Chirality-Selective Photoluminescence of Single-Walled Carbon Nanotubes by Ionic Liquids.

The chirality-selective near-infrared emission of surfactant stabilized single-wall carbon nanotubes could be controlled by simply varying the anion of commonly used 1-butyl-3-methylimidazolium ionic liquids. This result advances the notion of designer solvent ability of ionic liquids and provides opportunities for modulating the properties of nanomaterials.

A prospective, longitudinal study evaluating the baseline six-minute walk test as an individual reference value in systemic sclerosis patients.

Interstitial lung disease (ILD) and pulmonary arterial hypertension (PAH) are the leading causes of death in systemic sclerosis (SSc). Although the six-minute walk test (6MWT) is used for evaluating ILD and PAH, no data are available on the evolution of the six-minute walk distance (6MWD) in SSc patients without ILD and PAH and whether the baseline 6MWD could serve as individual reference value for the management of those who will develop PAH or ILD.

Functional Exercise Capacity Evaluated by Timed Walk Tests in Myasthenia Gravis.

We aimed to evaluate the test-retest reliability and construct validity of the six-and two-minute walk tests (6mWT and 2mWT, respectively) in myasthenia gravis (MG) patients.

Should the 6-minute walk test be stopped if oxyhemoglobin saturation falls below 80%?

To examine the occurrence of adverse events in patients undergoing assessment for pulmonary rehabilitation when a 6-minute walk test (6MWT) continues despite desaturation below 80%.

Biopolymer-Based Composite Materials Prepared Using Ionic Liquids.

Biopolymer-based composite materials have many potential applications in biomedical, pharmaceutical, environmental, biocatalytic, and bioelectronic fields, owing to their inherent biocompatibility and biodegradability. When used as solvents, ionic liquids can be used to fabricate biopolymers such as polysaccharides and proteins into various forms, including molded shapes, films, fibers, and beads. This article summarizes the processes for preparing biopolymer-based composite materials using ionic liquids. T...

Glass Transition in Supercooled Liquids with Medium-Range Crystalline Order.

The origin of the rapid dynamical slowdown in glass forming liquids in the growth of static length scales, possibly associated with identifiable structural ordering, is a much debated issue. Growth of medium range crystalline order (MRCO) has been observed in various model systems to be associated with glassy behavior. Such observations raise the question of whether molecular mechanisms for the glass transition in liquids with and without MRCO are the same. In this study we perform extensive molecular dynam...

Association of walk ratio during normal gait speed and fall in community-dwelling elderly people.

Walk ratio (WR), calculated by dividing step length by cadence, can be used to represent the gait characteristics of human beings to maintain their gait speed.

Integrated Circuits Comprising Patterned Functional Liquids.

Solid-state heterostructures are the cornerstone of modern electronics. To enhance the functionality and performance of integrated circuits, the spectrum of materials used in the heterostructures is being expanded by an increasing number of compounds and elements of the periodic table. While the integration of liquids and solid-liquid interfaces into such systems would allow unique and advanced functional properties and would enable integrated nanoionic circuits, solid-state heterostructures that incorporat...

Bis(imidazolyl)-BH₂+bis-(triazolyl)-BH₂- Ionic Liquids with High Density and Energy Capacity.

[Bis(imidazolyl)-BH₂]+[bis(triazolyl)-BH₂]- and [bis- (imidazolyl)-BH₂]+[tris(triazolyl)-BH]- were first synthesized, whose cations and anions were all functionalized with B-H groups and azoles. As B-H groups contributing to hypergolic activity and azole groups improving the energy outputs, the resulting ionic liquids exhibited ignition delay time as low as 20 ms and energy output as high as 461.1 kJ mol-1. Besides, densities (1.07-1.22 g∙cm-3) and density-specific impulse (ρIsp, ~ 360 s g cm-3) re...

Imidazolium ionic liquids as mobile phase additives in reversed phase liquid chromatography for the determination of iodide and iodate.

An analytical method for the simultaneous determination of iodide and iodate by reversed phase liquid chromatography with ultraviolet detection using imidazolium ionic liquids as mobile phase additives was developed in this paper. Imidazolium ionic liquids, pyridinium ionic liquids, and common ion pair reagent tetrabutylammonium hydroxide as mobile phase additives were compared. The results indicated that imidazolium ionic liquids as the mobile phase additives were better than any tetrabutylammonium hydroxi...

The liquid biopsies: What is their contribution to the management of cancer?

The « liquid biopsies » are samples of liquids such as blood, urine, spinal fluid that can contain tumor material. Clinical assays have been mainly focused on the peripheral blood containing circulating tumor cells and circulating tumor DNA. The circulating tumor cells are cancer cells released from the primary tumor or recurrences or metastases. They enter into the bloodstream after passing through the vessel wall. It is possible to analyze the circulating tumor cells by means of all cytologic and biom...

How to Ward Off Retinal Toxicity of Perfluorooctane and Other Perfluorocarbon Liquids?

Reactive and underfluorinated impurities are acknowledged as a source of cytotoxicity of perfluorocarbon liquids (PFCLs) used as blood substitutes. To determine whether this is also a relevant factor in retinal toxicity, we analyzed eight PFO batches associated with adverse ocular events.

Random migration of induced pluripotent stem cell-derived human gastrulation-stage mesendoderm.

Gastrulation is the initial systematic deformation of the embryo to form germ layers, which is characterized by the placement of appropriate cells in their destined locations. Thus, gastrulation, which occurs at the beginning of the second month of pregnancy, is a critical stage in human body formation. Although histological analyses indicate that human gastrulation is similar to that of other amniotes (birds and mammals), much of human gastrulation dynamics remain unresolved due to ethical and technical li...

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