Micellar and surface behavior of sodium deoxycholate characterized by surface tension and ellipsometric methods

1980 ◽  
Vol 78 (2) ◽  
pp. 466-478 ◽  
Author(s):  
David Charles Thomas ◽  
Sherril D. Christian
Keyword(s):  
Surface Tension ◽  
Sodium Deoxycholate ◽  
Surface Behavior

Refinement of Water Droplets With Surfactants for Wet Compression of Gas Turbine

2009 ◽  
Author(s):  
Rongkai Zhu ◽  
Qun Zheng ◽  
Guoqiang Yue ◽  
Rakesh Bhargava
Keyword(s):  
Surface Tension ◽  
Gas Turbine ◽  
Experimental Work ◽  
Ionic Surfactants ◽  
Water Droplets ◽  
Compression Process ◽  
Surface Behavior ◽  
Wet Compression ◽  
The Cost

Concerned with the influence of the size of water droplets on the effect of wet compression, it is important to control the size of water droplets among 5–10 microns or smaller, for this purpose an experimental work is carried out by improve the surface behavior of water aiming to reduce its surface tension. Non-ionic surfactants and its combination were employed to reach such an aim. The surface tension of water was reduced from 72.9mN/m to 41.2mN/m or even lower depending on the cost. It offers a possible way to refine spray, and ready to use in wet compression process.

Surface characteristics of vertebrate lung extracts

1961 ◽  
Vol 16 (6) ◽  
pp. 1075-1077 ◽  
Author(s):  
Dean A. Miller ◽  
Stuart Bondurant
Keyword(s):  
Surface Tension ◽  
Surface Area ◽  
Respiratory Mechanics ◽  
Biological Fluids ◽  
Surface Characteristics ◽  
Surface Behavior ◽  
Alveolar Structure ◽  
Mammalian Lung ◽  
Alveolar Stability

It has been suggested that alveolar stability is due, in part, to the presence of a noncellular alveolar lining which changes surface tension with changing surface area. Extracts of mammalian lungs manifest a decrease in surface tension with decrease in surface area. To compare surface characteristics with respiratory mechanics and anatomy, lung extracts were prepared from amphibians, reptiles, birds, and mammals. Lung extracts from mammalian lungs with true alveolar structure show typical surface tension-surface area characteristics, whereas other vertebrate lung extracts behave similarly to most other biological fluids. An alveolar lining layer with surface behavior similar to mammalian lung extracts would be expected to contribute to alveolar stability. Submitted on June 28, 1961

scholarly journals Center vortices, area law and the catenary solution

2015 ◽  
Vol 30 (34) ◽  
pp. 1550207 ◽  
Author(s):  
Roman Höllwieser ◽  
Derar Altarawneh
Keyword(s):  
Surface Tension ◽  
Wilson Loop ◽  
Dimensional Model ◽  
Expectation Values ◽  
Yang Mills ◽  
Surface Behavior ◽  
Vortex Lines ◽  
Center Vortex ◽  
Hypercubic Lattice ◽  
Area Law

We present meson–meson (Wilson loop) correlators in Z(2) center vortex models for the infrared sector of Yang–Mills theory, i.e. a hypercubic lattice model of random vortex surfaces and a continuous (2 + 1)-dimensional model of random vortex lines. In particular, we calculate quadratic and circular Wilson loop correlators in the two models, respectively, and observe that their expectation values follow the area law and show string breaking behavior. Further, we calculate the catenary solution for the two cases and try to find indications for minimal surface behavior or string surface tension leading to string constriction.

Effect of Amino Acids on Aggregation Behaviors of Sodium Deoxycholate at Air/Water Surface: Surface Tension and Oscillating Bubble Studies

Langmuir ◽  
2011 ◽  
Vol 27 (2) ◽  
pp. 538-545 ◽  
Author(s):  
Fang He ◽  
Guiying Xu ◽  
Jinyu Pang ◽  
Mingqi Ao ◽  
Tingting Han ◽  
...  
Keyword(s):  
Amino Acids ◽  
Surface Tension ◽  
Water Surface ◽  
Sodium Deoxycholate ◽  
Aggregation Behaviors

Physical Factors in the Thromboplastic Activity of Phospholipids

1967 ◽  
Vol 17 (03/04) ◽  
pp. 495-507 ◽  
Author(s):  
F Gobbi ◽  
U Barbieri ◽  
E Ascari
Keyword(s):  
Surface Tension ◽  
Sodium Deoxycholate ◽  
Surface Active Substance ◽  
Physical Factors ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
Thromboplastic Activity ◽  
Surface Active ◽  
Main Factors ◽  
Active Substances

SummaryCephalin suspensions lose their thromboplastic activity when incubated with Tween or with sodium deoxycholate. This effect is proportional to the concentration of the surface-active substance, and to the length of its incubation with the phospholipids.The disappearance of the thromboplastic activity of cephalin treated with surface-tension lowering substances is due to the increased dispersion of the suspensions, as demonstrated by the decrease of their optical density. The activity of sodium deoxycholate is faster than that of Tween.The impaired thromboplastin formation in the presence of phospholipids treated with Tween or with sodium deoxycholate is not due to the formation of inhibitors.Cephalin incubated with surface-tension lowering substances and recovered by ultracentrifugation does not show any thromboplastic activity.Electron-microscopic studies show that incubation with surface-active substances causes the demolition of the structure of phospholipid-particle, on which the thromboplastic activity seems to depend.The size of the particles and the electric surface-charge seem to be among the main factors responsible for the thromboplastic activity of phospholipids.

Indentation of a Membrane on an Elastic Half Space

1978 ◽  
Vol 45 (2) ◽  
pp. 320-324 ◽  
Author(s):  
M. A. Hajji
Keyword(s):  
Surface Tension ◽  
Half Space ◽  
Surface Membrane ◽  
Lung Parenchyma ◽  
Elastic Half Space ◽  
Material Surface ◽  
Surface Behavior ◽  
Entire Boundary ◽  
Indentation Tests ◽  
Circular Load

An analysis is presented of the deformation of a homogeneous isotropic elastic half space whose surface behavior departs from the classical due to the presence of a pretensed membrane or a material surface which exhibits surface tension. Two related problems are considered: the axisymmetric displacements caused by a uniform circular load and by a concentrated normal force. In contrast to the classical solution, the uniform load problem with surface tension is found to have a finite slope and zero shear stress over the entire boundary. The analysis is used to interpret data from indentation tests on inflated dog lobes and the mechanical properties of both the lung parenchyma and the surface membrane are obtained. The observed shape of the indented surface agrees well with the prediction of the analysis.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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