Incubator Temperature and Oxygen Concentration at the Plateau Stage in Oxygen Consumption Affects Intestinal Maturation of Broiler Chicks

2006 ◽  
Vol 5 (3) ◽  
pp. 229-240 ◽  
Author(s):  
M.W. Wineland . ◽  
V.L. Christensen . ◽  
I. Yildrum . ◽  
B.D. Fairchild . ◽  
K.M. Mann . ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Broiler Chicks ◽  
Intestinal Maturation

Positioning changes of mayfly nymphs due to behavioral regulation of oxygen consumption

1980 ◽  
Vol 58 (4) ◽  
pp. 618-622 ◽  
Author(s):  
Michael J. Wiley ◽  
Steven L. Kohler
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Field Conditions ◽  
Experimental Investigations ◽  
Behavioral Patterns ◽  
Behavioral Regulation ◽  
Dissolved Oxygen Concentration ◽  
Habitat Distribution ◽  
Renewal Rate

Experimental investigations in a small artificial stream showed that the positioning of mayfly nymphs (Ephemeroptera) on stones varied with dissolved oxygen concentration (DO). At low DO levels nymphs moved to current-exposed positions, presumably to increase the renewal rate of oxygen at respiratory exchange surfaces. The expected magnitude of positioning changes under field conditions was determined and suggests that behavioral regulation of oxygen consumption may commonly influence both habitat distribution and diel behavioral patterns. The implications of these results to drift studies are also discussed.

Oxygen Consumption by the Sea Anemone Calliactis Parasitica (Couch)

1980 ◽  
Vol 88 (1) ◽  
pp. 367-374
Author(s):  
A. E. BRAFIELD
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Low Frequency ◽  
High Amplitude ◽  
Total Oxygen ◽  
Strip Chart ◽  
Calliactis Parasitica ◽  
Cycle Lengths ◽  
Mean Cycle ◽  
Low Amplitude

Oxygen consumption by Calliactis parasitica, measured in a continuousflow polarographic respirometer, yielded a slope of 0·92 when plotted against body weight on log scales. This high value is discussed in terms of the sea anemone's basically laminate nature. Strip-chart records of the oxygen concentration of water which had just passed a specimen of Calliactis commonly showed rhythmic fluctuations, either of low amplitude and high frequency or high amplitude and low frequency (mean cycle lengths 11 and 34 min respectively). The fluctuations are explained in terms of rhythmic muscular contractions which irrigate the enteron for respiratory purposes. Analysis of the slow fluctuations indicates that the endoderm is responsible for about 18% of the total oxygen consumption. The oxygen concentration of water in the enteron, measured and recorded continuously, was 4–27% of the air-saturation level. These strip chart records also frequently showed rhythmic fluctuations (mean cycle length 12 min), apparently resulting from the muscular contractions.

Effect of Incubator Temperature and Oxygen Concentration at the Plateau Stage in Oxygen Consumption on Turkey Embryo Muscle Growth and Development

2007 ◽  
Vol 6 (6) ◽  
pp. 406-412 ◽  
Author(s):  
V.L. Christense ◽  
M. J. Winelan ◽  
J. L. Grimes ◽  
E. O. Oviedo ◽  
P.S . Mozdziak ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Growth And Development ◽  
Muscle Growth

scholarly journals Mathematical modelling of oxygen concentration in bovine and murine cumulus–oocyte complexes

Reproduction ◽  
2006 ◽  
Vol 131 (6) ◽  
pp. 999-1006 ◽  
Author(s):  
A R Clark ◽  
Y M Stokes ◽  
M Lane ◽  
J G Thompson
Keyword(s):  
Mathematical Model ◽  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Consumption Rate ◽  
Cumulus Cells ◽  
Common Boundary ◽  
Nonlinear Variation ◽  
Cumulus Oocyte Complex ◽  
Atp Generation ◽  
Metabolic Data

Immature oocytes benefit from nutrient modification of the follicular environment by the surrounding cumulus mass. However, the oxygen concentration that the oocyte may be exposed to could be lower than the antral follicular concentration due to the metabolism of surrounding cumulus cells. Using metabolic data previously determined, we have developed a mathematical model of O2diffusion across the bovine and murine cumulus–oocyte complex. From this we have determined that across a physiological range of external pO2, less than 0.25% and 0.5% O2is removed by cumulus cells within the bovine and murine cumulus–oocyte complex respectively. Our model differs from others as it: incorporates a term that allows for nonlinear variation of the oxygen consumption rate with oxygen concentration; considers two regions (oocyte and cumulus) sharing a common boundary, both of which consume oxygen at different non linear rates. Cumulus cells therefore remove little O2, thus sparing this essential gas for the oocyte, which is dependent on ATP generation via oxidative phosphorylation.

scholarly journals Effects of oxygen tension and pH on the respiratory burst of human neutrophils

Blood ◽  
1979 ◽  
Vol 53 (6) ◽  
pp. 1133-1139 ◽  
Author(s):  
TG Gabig ◽  
SI Bearman ◽  
BM Babior
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Respiratory Burst ◽  
Low Ph ◽  
Human Neutrophils ◽  
Respiratory Burst Activity ◽  
Similar Dependence ◽  
Activated Neutrophils ◽  
Acidic Conditions ◽  
O2 Production

Abstract The respiratory burst of human neutrophils was measured under conditions of hypoxia and low pH. O2 -- production by neutrophils activated with opsonized zymosan fell slowly as the oxygen concentration declined to 1%, then dropped more sharply, reaching negligible levels at oxygen concentrations less than 0.25%. Production was half maximal at an oxygen concentration of 0.35% (equivalent to approximately 10-microM dissolved oxygen). O2- production by the cell- free O2- -forming system prepared from zymosan-activated neutrophils showed a similar dependence on oxygen concentration. A drop in pH caused decreases in both oxygen consumption and O2-- production by zymosan-treated neutrophils, values at PH 6.0 being 10%--20% of those observed at pH 7.5. Experiments with the cell-free O2-- -forming system suggested that this decline in respiratory burst activity at low pH was due to inefficient activation of the O2-- -forming enzyme under acidic conditions.

scholarly journals Effects of Incubator Temperature and Oxygen Concentration During the Plateau Stage of Oxygen Consumption on Turkey Embryo Long Bone Development

2008 ◽  
Vol 87 (8) ◽  
pp. 1484-1492 ◽  
Author(s):  
E.O. Oviedo-Rondón ◽  
J. Small ◽  
M.J. Wineland ◽  
V.L. Christensen ◽  
J.L. Grimes ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Bone Development ◽  
Long Bone
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