Hematotoxicity, Leukemogenecity and Carcinogenecity of Chronic Exposure to Benzene

1991 ◽  
pp. 415-434 ◽  
Author(s):  
Muzaffer Aksoy
Keyword(s):  
Chronic Exposure

Development of apical pits in chloride cells of the gills of Pimephales promelas after chronic exposure to acid water

1983 ◽  
Vol 41 ◽  
pp. 462-463
Author(s):  
Richard L. Leino ◽  
Jon G. Anderson ◽  
J. Howard McCormick
Keyword(s):  
Confidence Interval ◽  
Chronic Exposure ◽  
Lake Superior ◽  
Pimephales Promelas ◽  
Chloride Cells ◽  
Fathead Minnows ◽  
Secondary Lamellae ◽  
Untreated Water ◽  
Water Ph ◽  
Flow Through

Groups of 12 fathead minnows were exposed for 129 days to Lake Superior water acidified (pH 5.0, 5.5, 6.0 or 6.5) with reagent grade H2SO4 by means of a multichannel toxicant system for flow-through bioassays. Untreated water (pH 7.5) had the following properties: hardness 45.3 ± 0.3 (95% confidence interval) mg/1 as CaCO3; alkalinity 42.6 ± 0.2 mg/1; Cl- 0.03 meq/1; Na+ 0.05 meq/1; K+ 0.01 meq/1; Ca2+ 0.68 meq/1; Mg2+ 0.26 meq/1; dissolved O2 5.8 ± 0.3 mg/1; free CO2 3.2 ± 0.4 mg/1; T= 24.3 ± 0.1°C. The 1st, 2nd and 3rd gills were subsequently processed for LM (methacrylate), TEM and SEM respectively.Three changes involving chloride cells were correlated with increasing acidity: 1) the appearance of apical pits (figs. 2,5 as compared to figs. 1, 3,4) in chloride cells (about 22% of the chloride cells had pits at pH 5.0); 2) increases in their numbers and 3) increases in the % of these cells in the epithelium of the secondary lamellae.

The Effect of Vitamin A on the Intermittent Nitrogen Dioxide Gas Exposure in Hamsters

1976 ◽  
Vol 34 ◽  
pp. 176-177
Author(s):  
J.C.S. Kim ◽  
M.G. Jourden ◽  
E.S. Carlisle
Keyword(s):  
Electron Microscopy ◽  
Vitamin A ◽  
Nitrogen Dioxide ◽  
Chronic Exposure ◽  
Light And Electron Microscopy ◽  
Specific Effect ◽  
Deficient Diet ◽  
Intermittent Exposure ◽  
Hypovitaminosis A ◽  
Gas Exposure

Chronic exposure to nitrogen dioxide in rodents has shown that injury reaches a maximum after 24 hours, and a reparative adaptive phase follows (1). Damage occurring in the terminal bronchioles and proximal portions of the alveolar ducts in rats has been extensively studied by both light and electron microscopy (1).The present study was undertaken to compare the response of lung tissue to intermittent exposure to 10 ppm of nitrogen dioxide gas for 4 hours per week, while the hamsters were on a vitamin A deficient diet. Ultrastructural observations made from lung tissues obtained from non-gas exposed, hypovitaminosis A animals and gas exposed animals fed a regular commercially prepared diet have been compared to elucidate the specific effect of vitamin A on nitrogen dioxide gas exposure. The interaction occurring between vitamin A and nitrogen dioxide gas has not previously been investigated.

HISTOPATHOLOGIC CHANGES IN RAT ORGANS UPON CHRONIC EXPOSURE TO FORMALDEHYDE VAPOR

2014 ◽  
Vol 13 (2) ◽  
pp. 127-140
Author(s):  
Snur Muhammad Amin Hassan ◽  
Azad Kareem Saeed ◽  
Nabil Abdul-Massih Salmo ◽  
Ahmed Hamdi Mehdi ◽  
Nali Abdulqadr Maaruf
Keyword(s):  
Chronic Exposure ◽  
Rat Organs ◽  
Formaldehyde Vapor ◽  
Histopathologic Changes

Effects of Chronic Exposure to Electromagnetic Waves at 930 MHz Frequency on Oxidative Stress in Plasma and Some Organs of Wistar Rats

2012 ◽  
Vol 3 (7) ◽  
pp. 1-7
Author(s):  
L. TAZROUT L. TAZROUT ◽  
◽  
K. TALEA K. TALEA ◽  
S. EL AMRANI S. EL AMRANI ◽  
I. M’TOUGUY I. M’TOUGUY ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Chronic Exposure ◽  
Electromagnetic Waves ◽  
Wistar Rats
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