Copper-induced non-selective permeability changes in intracellularly perfused snail neurons

1991 ◽  
Vol 11 (5) ◽  
pp. 349-354 ◽  
Author(s):  
Tibor Kiss ◽  
János Györi ◽  
Oleg N. Osipenko ◽  
Silva B. Maginyan
Keyword(s):  
Snail Neurons ◽  
Selective Permeability ◽  
Permeability Changes

Selective permeability changes in the lungs and airways of sheep after toxic smoke inhalation

1990 ◽  
Vol 68 (5) ◽  
pp. 2165-2170 ◽  
Author(s):  
R. E. Barrow ◽  
S. E. Morris ◽  
J. O. Basadre ◽  
D. N. Herndon
Keyword(s):  
Time Course ◽  
Microvascular Dysfunction ◽  
Inhalation Injury ◽  
Smoke Inhalation ◽  
Base Line ◽  
Microvascular Changes ◽  
Selective Permeability ◽  
Permeability Changes ◽  
Lungs And Airways

The effect of toxic smoke inhalation on selective microvascular sieving of macro-molecules and lymph protein flux was assessed in adult sheep to determine whether the time course of microvascular dysfunction differs between the lung and trachea. Protein flux across the lung increased sixfold 48 h after inhalation of the products of incomplete cotton combustion, whereas tracheal protein flux increased fivefold 8 h after exposure and returned to near base line 48 h after exposure. The lung and trachea selectively retained some sieving to three different protein macromolecules with molecular radii of 36, 54, and 123 A. In the lungs the sieving selectivity for these macromolecules was least 48 h after injury, and in the trachea molecular selectivity was least 8 h after injury. These data suggest that the time course of microvascular injury differs for the trachea and the lung; microvascular changes are detected earlier in the trachea than in the lung. The inhalation injury described thus permits the characterization of the time course of airway and lung microvascular changes.

Schistosoma mansoni: tail loss in relation to permeability changes during cercaria–schistosomulum transformation

Parasitology ◽  
1975 ◽  
Vol 71 (1) ◽  
pp. 9-18 ◽  
Author(s):  
R. E. Howells ◽  
S. E. Gerken ◽  
F. J. Pinto-Ramalho ◽  
U. Kawazoe ◽  
G. Gazzinelli ◽  
...  
Keyword(s):  
Amino Acids ◽  
Methylene Blue ◽  
Schistosoma Mansoni ◽  
Body Region ◽  
Experimental Conditions ◽  
General Body ◽  
Tail Loss ◽  
Permeability Changes ◽  
Extensive Lesion ◽  
Scanning Electron

The hind-body region of Schistosoma mansoni cercariae observed in the scanning electron microscope demonstrates various stages of contraction which may be compared with those of living larvae which are secreting the acetabular gland contents.No evidence for an extensive lesion was found in cercarial bodies which had shed their tails under experimental conditions. Experiments on the permeability of the larvae to sodium fluoride, methylene blue and amino acids demonstrated that tail loss significantly affects the permeability of the bodies although the effect is greater immediately after decaudation than at later times. Subsequent increases in permeability may be correlated with a change in the general body surface.

scholarly journals The activity of isolated snail neurons controlling locomotion is affected by glucose

BIOPHYSICS ◽  
2015 ◽  
Vol 11 (0) ◽  
pp. 55-60 ◽  
Author(s):  
Varvara Dyakonova ◽  
László Hernádi ◽  
Etsuro Ito ◽  
Taisia Dyakonova ◽  
Igor Zakharov ◽  
...  
Keyword(s):  
Snail Neurons

scholarly journals Properties of PTFE tape as a semipermeable membrane in fluorous reactions

2015 ◽  
Vol 11 ◽  
pp. 980-993 ◽  
Author(s):  
Brendon A Parsons ◽  
Olivia Lin Smith ◽  
Myeong Chae ◽  
Veljko Dragojlovic
Keyword(s):  
Surface Tension ◽  
Organic Compounds ◽  
Polymer Films ◽  
Semipermeable Membrane ◽  
Reaction Vessel ◽  
Dimethyl Phthalate ◽  
Delivery Tube ◽  
Selective Permeability ◽  
Solvent Uptake ◽  
Solvent Adsorption

In a PTFE tape phase-vanishing reaction (PV-PTFE), a delivery tube sealed with PTFE tape is inserted into a vessel which contains the substrate. The reagent diffuses across the PTFE tape barrier into the reaction vessel. PTFE co-polymer films have been found to exhibit selective permeability towards organic compounds, which was affected by the presence of solvents. In this study, we attempted to establish general trends of permeability of PTFE tape to different compounds and to better describe the process of solvent transport in PV-PTFE bromination reactions. Though PTFE tape has been reported as impermeable to some compounds, such as dimethyl phthalate, solvent adsorption to the tape altered its permeability and allowed diffusion through channels of solvent within the PTFE tape. In this case, the solvent-filled pores of the PTFE tape are chemically more akin to the adsorbed solvent rather than to the PTFE fluorous structure. The solvent uptake effect, which was frequently observed in the course of PV-PTFE reactions, can be related to the surface tension of the solvent and the polarity of the solvent relative to the reagent. The lack of pores in bulk PTFE prevents solvents from altering its permeability and, therefore, bulk PTFE is impermeable to most solvents and reagents. However, bromine, which is soluble in liquid fluorous media, diffused through the bulk PTFE. A better understanding of the PTFE phase barrier will make it possible to further optimize the PV-PTFE reaction design.

scholarly journals Action potential bursts in central snail neurons elicited by paeonol: roles of ionic currents

2010 ◽  
Vol 31 (12) ◽  
pp. 1553-1563 ◽  
Author(s):  
Yi-hung Chen ◽  
Pei-lin Lin ◽  
Hui-yu Hsu ◽  
Ya-ting Wu ◽  
Han-yin Yang ◽  
...  
Keyword(s):  
Action Potential ◽  
Ionic Currents ◽  
Snail Neurons
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