نتایج جستجو برای: polar fluid

تعداد نتایج: 264446  

Journal: :Trends in Analytical Chemistry 2021

Recent developments in supercritical fluid chromatography (SFC) have highlighted the applicability of this technique for analysis highly polar compounds. The combination stationary phases and CO2-based mobile with an increasing presence liquid co-solvent (up to 100%) has enabled further expand application field SFC towards a variety samples such as endogenous metabolites, plant extracts, water-...

Journal: :Journal of chromatography. A 1997
S J Lehotay C H Lee

A fibrous cellulose powder (CF-1) was investigated as a drying agent for supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE), also known as accelerated solvent extraction. Analysis of fifty-eight diverse pesticides was performed using gas chromatography-ion-trap mass spectrometric detection (GC-ITD). Extraction efficiencies were correlated versus pesticide polarity with...

2012
Tillmann Stieger Marco G. Mazza Martin Schoen

We report molecular dynamics simulations of confined liquid crystals using the Gay-Berne-Kihara model. Upon isobaric cooling, the standard sequence of isotropic-nematic-smectic A phase transitions is found. Upon further cooling a reentrant nematic phase occurs. We investigate the temperature dependence of the self-diffusion coefficient of the fluid in the nematic, smectic and reentrant nematic ...

2009
X. F. Wu L. W. Zhou J. P. Huang

Mechanical abrasion is a phenomenon which commonly occurs during the application of polarmolecular electrorheological (PMER) fluids. We experimentally investigate its effect by milling PMER particles for different times. We find that this effect can significantly reduce electrorheological effects of PMER fluids made of butyrolactone-modified TiO2 particles. This reduction results from the reduc...

Journal: :The Journal of Experimental Medicine 2003
Gregory Pincus E. V. Enzmann

1. A definite chronological sequence of events occurs in the eggs and follicles of rabbits after mating or after the injection of ovulation-inducing substances. The follicle secretes secondary liquor folliculi, and there occurs a separation of the corona radiata from strands connecting it to the follicle cells. The ovum goes through nuclear maturation with as climax the production of the first ...

Journal: :The Journal of Cell Biology 1982
E Weidner

The polar filaments within microsporidian spores discharges as tubes with subsecond velocity. Populations of discharging tubes of Glugea hertwigi spores pulse-labeled with latex particles for 1-3 s were consistently devoid of label at the distal ends; discharging tubes were completely labeled after 30- to 60-s exposure to latex. This experiment indicates that discharge tubes grow at the tip. Co...

2009
Ralf Greve

The role of water ice in the solar system is reviewed from a fluid-dynamical point of view. On Earth and Mars, water ice forms ice sheets, ice caps and glaciers at the surface, which show glacial flow under their own weight. By contrast, water ice is a major constituent of the bulk volume of the icy satellites in the outer solar system, and ice flow can occur as thermal convection. The rheology...

Journal: :Thorax 1987
R B Low G S Davis D Y Bell M S Giancola P M Vacek

The recovery of protein and two specific surfactant lipids, phosphatidylcholine and phosphatidylglycerol, from bronchoalveolar lavage fluid is altered in chronic and acute non-granulomatous interstitial lung disease. This study set out to determine whether the same is true for patients with sarcoidosis. The median value for recovery of protein from lavage fluid was significantly higher in 21 pa...

2010
Stéphanie Chevalliot Stein Kuiper Jason Heikenfeld

Basic electrowetting theory predicts that a continued increase in applied voltage will allow contact angle modulation to zero degrees. In practice, the effect of contact angle saturation has always been observed to limit the contact angle modulation, often only down to a contact angle of 60 to 70. The physical origins of contact angle saturation have not yet been explained successfully and uneq...

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