scholarly journals Oxygen Consumption and Lipid Peroxidation of Chick Embryos at Various Oxygen Levels

1987 ◽  
Vol 3 (1) ◽  
pp. 65-72
Author(s):  
Yoshihiro YOSHIMURA ◽  
Hiroshi TANAKA ◽  
Kohei TAMURA ◽  
Keiko OHSAWA ◽  
Kazuo IMAEDA
Keyword(s):  
Lipid Peroxidation ◽  
Oxygen Consumption ◽  
Chick Embryos ◽  
Oxygen Levels

Respiratory and Circulatory Responses to Hypoxia in the Lobster Homarus Americanus

1975 ◽  
Vol 62 (3) ◽  
pp. 637-655 ◽  
Author(s):  
B. R. MCMAHON ◽  
J. L. WILKENS
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Homarus Americanus ◽  
Control Mechanisms ◽  
Blood Oxygen ◽  
Experimental Conditions ◽  
Oxygen Levels ◽  
Wide Range ◽  
Oxygen Tensions

Contrary to previous reports, oxygen consumption is maintained over a wide range of external oxygen tensions in the lobster Homarus americanus. In animals acclimated to the experimental conditions this response is mediated by increased branchial pumping, increased effectiveness of oxygen uptake by the gills and an increased contribution by the respiratory pigment to the oxygen delivered to the tissues. Circulatory blood oxygen levels are generally high in lobsters resting in well-aerated water. Mechanisms for detection of hypoxia and possible control mechanisms are discussed.

Oxygen consumption by chick embryos exposed to mechanical (shaking) stress

1979 ◽  
Vol 46 (2) ◽  
pp. 298-301
Author(s):  
R. R. Schmidt ◽  
S. Kaplan ◽  
J. J. Smith
Keyword(s):  
Oxygen Consumption ◽  
Developmental Stages ◽  
Chick Embryos ◽  
O2 Consumption ◽  
In Ovo ◽  
Consumption Values ◽  
Induced Stress ◽  
Early Return ◽  
Functionally Impaired ◽  
First Time

Stage 34 (8-day) and 41 (15-day) chick embryos (Gallus gallus; in ovo) were exposed (3 min) to two separate amounts of mechanical (shaking) stress. Oxygen consumption determinations, following a temperature equilibration period (60 min), were made on entire, intact eggs using a Warburg apparatus equipped with 130-ml flasks modified to hold the egg. Shaking at 300 excursions per minute (epm) resulted in depressed O2 consumption by stages 34 and 41. Only stage 34 embryos had markedly depressed O2 consumption values when shaken at 100 epm. When exposed to 300 epm and reincubated for either 1, 2, or 4 hr prior to O2 consumption determinations stage 34 embryos, following an early return to control levels exhibited a marked fall in O2 consumption by 4 h reincubation. The stage 41 embryos, on the other hand, demonstrated a gradual rise to control O2 consumption levels by 4 h reincubation. Oxygen consumption has now been shown for the first time in an embryonic system (at two distinct developmental stages) to be functionally impaired by mechanically induced stress.

Oxygen consumption in normal and trypan blue-treated chick embryos

Teratology ◽  
1968 ◽  
Vol 1 (4) ◽  
pp. 369-373 ◽  
Author(s):  
Stanley Kaplan ◽  
E. Marshall Johnson
Keyword(s):  
Oxygen Consumption ◽  
Trypan Blue ◽  
Chick Embryos

Inhibition of Lipid Peroxidation by Selenium in Chick Embryos

1997 ◽  
Vol 20 (1-2) ◽  
pp. 79-98 ◽  
Author(s):  
K. Padmaja ◽  
B. V. Somasekharaiah ◽  
A. R. K. Prasad
Keyword(s):  
Lipid Peroxidation ◽  
Chick Embryos

scholarly journals Ion fluxes in silver catfish (Rhamdia quelen) juveniles exposed to different dissolved oxygen levels

2006 ◽  
Vol 4 (4) ◽  
pp. 435-440 ◽  
Author(s):  
Felipe Link de Rosso ◽  
Keidi C. S. Bolner ◽  
Bernardo Baldisserotto
Keyword(s):  
Organic Matter ◽  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Ammonia Excretion ◽  
Ion Fluxes ◽  
Phytoplankton Blooms ◽  
Silver Catfish ◽  
Oxygen Levels ◽  
Rhamdia Quelen ◽  
Series Of Experiments

Low dissolved oxygen levels in the water (hypoxia) can be provoked by oxygen consumption by fish and other organisms, organic matter decomposition, phytoplankton blooms, and temperature increase. The objective of the present study was to investigate Na+, Cl-, K+, and ammonia fluxes in silver catfish (Rhamdia quelen) exposed to different dissolved oxygen levels. Juveniles (9 ± 1g) maintained at 6.0 mg.L-1 dissolved oxygen were transferred to four 40 L aquaria with different dissolved oxygen levels (in mg.L-1): 6.0, 4.5, 3.5, and 2.5. In another series of experiments, juveniles were acclimated at 6.0 or 2.5 mg.L-1 dissolved oxygen levels, and then placed in two 40 L aquaria with 6.0 mg.L-1 dissolved oxygen. For both series of experiments, 1, 24, 48 or 120 h after transference juveniles were placed in individual chambers of 200 mL (with the same dissolved oxygen levels of their respective aquaria) for 3 h. Water samples were collected for analysis of Na+, Cl-, K+, and ammonia levels. The obtained results allow concluding that exposure to 2.5 mg.L-1 dissolved oxygen levels promotes loss of ions and lower ammonia excretion in silver catfish juveniles, but these losses are rapidly stabilized for Na+ and Cl-. Exposure to less hypoxic levels also changes ion fluxes and ammonia excretion, but there is no clear relationship between both parameters in this species. Therefore, silver catfish osmoregulation seems to be affected when this species is transferred from normoxic to hypoxic waters and vice-versa.

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