IONIC TRANSPORT PROCESSES IN THE SILVER HALIDES

1962 ◽  
Vol 66 (12) ◽  
pp. 2380-2383 ◽  
Author(s):  
Robert J. Friauf
Keyword(s):  
Ionic Transport ◽  
Transport Processes ◽  
Silver Halides

Characteristics of ionic transport processes in fish intestinal epithelial cells

Biosystems ◽  
1998 ◽  
Vol 45 (2) ◽  
pp. 123-140 ◽  
Author(s):  
Liviu Movileanu ◽  
Maria Luiza Flonta ◽  
Dan Mihailescu ◽  
Petre T. Frangopol
Keyword(s):  
Epithelial Cells ◽  
Intestinal Epithelial Cells ◽  
Ionic Transport ◽  
Transport Processes ◽  
Intestinal Epithelial

scholarly journals Transport Processes in TlI and in the AgI-TlI-System

1974 ◽  
Vol 29 (5) ◽  
pp. 782-785
Author(s):  
A. Sdiiraldi ◽  
A. Magistris ◽  
E. Pezzati
Keyword(s):  
Electrical Conductivity ◽  
Transport Properties ◽  
Electronic Conductivity ◽  
Ionic Transport ◽  
Transport Processes ◽  
Silver Ion ◽  
Transport Numbers ◽  
Bond Ionicity ◽  
High Electronic Conductivity ◽  
High Silver

Abstract The transport properties of TlI and of the system AgI -TlI were investigated by measuring the electrical conductivity, σ , and the electronic and ionic transport numbers. A particularly high electronic conductivity was detected in β-TlI, while the a phase showed a predominant anionic contribution, as in TlCl and TlBr. The intermediate compounds, AgTl2I3 and AgTlI2, are silver ion conductors, but they exhibit low σ values. A comparison with other poliiodides, with a high silver ion conductivity, is suggested on the basis of the crystal bond ionicity.

scholarly journals Ionic Transport Processes

2008 ◽  
Author(s):  
Kyösti Kontturi ◽  
Lasse Murtomäki ◽  
José A. Manzanares
Keyword(s):  
Ionic Transport ◽  
Transport Processes

scholarly journals The effects of cyanobacteria and the cyanobacterial toxin microcystin-LR on Ca2+ transport and Na+/K+-ATPase in tilapia gills

1996 ◽  
Vol 199 (6) ◽  
pp. 1319-1326
Author(s):  
N Bury ◽  
G Flik ◽  
F Eddy ◽  
G Codd
Keyword(s):  
Membrane Vesicles ◽  
Ionic Transport ◽  
Transport Processes ◽  
Whole Body ◽  
Inhibitory Effects ◽  
Plasma Membrane Vesicles ◽  
Cyanobacterial Toxin ◽  
Physiological Processes ◽  
Basolateral Plasma Membrane ◽  
P Type

The effects of cytotoxic substances from cyanobacteria on ionic transport processes in tilapia (Oreochromis mossambicus) were examined. Inhibitory effects on ionic transport including whole-body Ca2+ fluxes and P-type ATPases of the gill were found. The compounds tested were (1) purified microcystin-LR (MC-LR), a heptapeptide hepatotoxin produced by the cyanobacterium Microcystis aeruginosa, (2) extracts from M. aeruginosa strain PCC 7820, a strain producing MC-LR and other microcystin variants, and (3) extracts of M. aeruginosa CYA 43, a strain producing toxins including small quantities of MC-LR. Whole-body Ca2+ influx was inhibited by a 24 h exposure to extracts of M. aeruginosa CYA 43 and 7820, but not by exposure to an equivalent amount (90 mg l-1) of purified MC-LR. Shorter exposure times (4 h) were ineffective. Fish exposed to extracts from M. aeruginosa CYA 43 showed significant plasma hypocalcaemia. Both strains of M. aeruginosa inhibited Ca2+ uptake by basolateral plasma membrane vesicles (BLMVs), endoplasmic reticulum (ER) and mitochondria, as well as BLMV K+-dependent p-nitrophenol phosphatase (pNPPase) activity. The hydrophobic fractions of the cyanobacterial extracts were the most potent, inhibiting BLMV, ER and mitochondrial Ca2+ uptake by up to 99 %, but they were less inhibitory of BLMV K+-dependent pNPPase activity. Purified MC-LR was without effect on these preparations. In conclusion, cytotoxic substances from cyanobacteria have the potential to disrupt normal physiological processes dependent upon Ca2+ transport processes in tilapia gills.

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