scholarly journals Model-Based Quantification of Blood Flow Rate and Oxygen Consumption Rate of Biological Tissues Using Image-Guided Near Infrared Light Spectroscopy

2013 ◽  
Vol 04 (03) ◽  
Author(s):  
Zhen Yuan
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Flow Rate ◽  
Oxygen Consumption Rate ◽  
Near Infrared ◽  
Consumption Rate ◽  
Blood Flow Rate ◽  
Biological Tissues ◽  
Infrared Light ◽  
Image Guided

Blood oxygen requirements in resting crab (Carcinus maenas) 24 h after feeding

1999 ◽  
Vol 77 (5) ◽  
pp. 784-794 ◽  
Author(s):  
Alexia Legeay ◽  
Jean-Charles Massabuau
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Flow Rate ◽  
Consumption Rate ◽  
Carcinus Maenas ◽  
Blood Flow Rate ◽  
Blood Oxygen ◽  
Partial Pressure Of Oxygen ◽  
Blood Ph ◽  
Oxygen Requirements

Numerous resting unfed water-breathers have a strategy of gas-exchange regulation that consists of setting the arterial partial pressure of oxygen (Pao2) at 1-3 kPa. This raises a question concerning the extent to which physiological functions are limited in this situation. To obtain insight into this problem, we studied the steady-state adaptation of the blood-oxygen transfer system in the crab Carcinus maenas during the doubling of the oxygen consumption rate, Mo2 (i.e., during the period of specific dynamic action of food (SDA)), that occurs 24 h after feeding. We showed that this increase in the oxygen consumption rate 24 h after a meal is not limited by a blood partial pressure of oxygen (Po2) as low as 0.8-1.5 kPa in either normoxia or hypoxia (Po2 of the inspired water = 4 kPa). In normoxia, adaptation of the oxygen-transport system, if any, consisted of a combined set of adaptations of small amplitude (in absolute value), rather than major changes in blood oxygenation status, blood flow rate, or oxygen affinity (although blood pH decreases). In hypoxia, the SDA was mainly associated with an increase in blood flow rate and blood pH, with no changes in blood lactate, urate, calcium, and haemocyanin concentrations. The results are discussed, in an environmental context, in terms of minimal oxygen requirements in water-breathers.

Blood flow and oxygen consumption in avian skeletal muscle during hypoxia

1981 ◽  
Vol 50 (2) ◽  
pp. 450-455 ◽  
Author(s):  
B. R. Grubb
Keyword(s):  
Skeletal Muscle ◽  
Blood Flow ◽  
Oxygen Consumption ◽  
Flow Rate ◽  
Blood Flow Rate ◽  
Oxygen Extraction ◽  
Arterial Oxygen ◽  
Low Oxygen ◽  
Arterial Oxygen Content ◽  
Hindlimb Muscle

Birds are known to be much more tolerant than mammals to high altitude [low oxygen pressure (PO2)], and it is therefore of interest to know the responses of their muscles to low oxygen. We studied the influence of hypoxia on the rate of blood flow, oxygen extraction, and oxygen consumption (VO2) in resting hindlimb muscle of ducks. We found that during normoxia the VO2 in this muscle mass was similar to resting mammalian red muscle. However, blood flow rate (45 ml x 100 g-1 x min-1) and venous PO2 (70 Torr) were much higher than in resting red or white mammalian muscle. Hypoxia down to 35-40 Torr resulted in no change in blood flow, but oxygen extraction increased dramatically as arterial PO2 fell below 70 Torr. The resting VO2 was maintained even at the lowest arterial oxygen content (5 ml/100 ml). From these experiments it appears as though duck skeletal muscle has a "luxuriant" resting blood flow rate that is sufficient to supply skeletal muscle with adequate oxygen.

scholarly journals MRI Estimation of Global Brain Oxygen Consumption Rate

2010 ◽  
Vol 30 (12) ◽  
pp. 1987-1987 ◽  
Author(s):  
Varsha Jain ◽  
Michael C Langham ◽  
Felix W Wehrli
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Consumption ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Correct Version ◽  
Brain Oxygen ◽  
Global Brain

Journal of Cerebral Blood Flow & Metabolism (2010) 30, 1598–1607; doi:10.1038/jcbfm.2010.49; published online 21 April 2010 Following the publication of this issue, the editors noticed that the cover figure for the September 2010 issue was incorrect. The correct version appears below. Please note that this figure was created by the authors of the above article and is credited to them in the issue.

Oxygen Consumption of Embryos and Parents, and Oxygen Transfer Characteristics Within the Ovary of Two Species of Viviparous Seaperch, Rhacochilus vacca and Embiotoca lateralis

1972 ◽  
Vol 29 (11) ◽  
pp. 1543-1553 ◽  
Author(s):  
P. W. Webb ◽  
J. R. Brett
Keyword(s):  
Blood Flow ◽  
Oxygen Consumption ◽  
Oxygen Tension ◽  
Flow Rate ◽  
Oxygen Transfer ◽  
Blood Flow Rate ◽  
Unit Weight ◽  
Ovarian Fluid ◽  
Transfer Characteristics ◽  
Embiotoca Lateralis

Oxygen tension and content of intraovarian fluid were measured for the viviparous pile perch, Rhacochilus vacca, during middle and late gestation. Oxygen tension decreased with increasing demands of the brood, reaching a minimum of 13.7 mm Hg just prior to parturition. Total oxygen content of the ovarian fluid decreased to a minimum of 22 mg O2, rising thereafter to 54 mg O2 at parturition as the volume of ovarian fluid increased. The in vitro oxygen consumption of the young per unit weight increased 2.5 times during gestation reaching 222 mg O2/kg/hr at birth (mean weight 3.8 g).Oxygen consumption of two pregnant striped seaperch, Embiotoca lateralis, was fairly constant at 70 mg O2/kg/hr early in gestation, increasing later to approximately 107 mg O2/kg/hr at parturition.An oxygen dissociation curve was determined for ventricular blood of pregnant pile perch. The p50 was 12.5 mm Hg. Along with other parameters, this was used to estimate the oxygen transfer characteristics of the brood–ovary exchange system, maximum possible oxygen consumption, and ovarian blood flow rate. The capacity of the system to meet the increasing requirements of the young decreased during gestation, reaching limiting conditions at parturition. It was concluded that transfer of oxygen to the young would be controlled by, and ultimately limited by, ovarian blood flow rate. The brood–ovary system is compared with the mammalian placenta.

Microbial efficiency in a meromictic reservoir

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Grażyna Mazurkiewicz-Boroń ◽  
Teresa Bednarz ◽  
Elżbieta Wilk-Woźniak
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Release Rate ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Metabolic Efficiency ◽  
Sulphur Compounds ◽  
Carbon Dioxide Release ◽  
Microbial Efficiency ◽  
Ion Contents

Microbial efficiency in a meromictic reservoirIndices of microbial efficiency (expressed as oxygen consumption and carbon dioxide release) were determined in the water column of the meromictic Piaseczno Reservoir (in an opencast sulphur mine), which is rich in sulphur compounds. Phytoplankton abundances were low in both the mixolimnion (up to 15 m depth) and monimolimnion (below 15 m depth). In summer and winter, carbon dioxide release was 3-fold and 5-fold higher, respectively, in the monimolimnion than in the mixolimnion. Laboratory enrichments of the sulphur substrate of the water resulted in a decrease in oxygen consumption rate of by about 42% in mixolimnion samples, and in the carbon dioxide release rate by about 69% in monimolimnion samples. Water temperature, pH and bivalent ion contents were of major importance in shaping the microbial metabolic efficiency in the mixolimnion, whilst in the monimolimnion these relationships were not evident.

scholarly journals Correction: Paszkiewicz et al. A Peripheral CB1R Antagonist Increases Lipolysis, Oxygen Consumption Rate, and Markers of Beiging in 3T3-L1 Adipocytes Similar to RIM, Suggesting That Central Effects Can Be Avoided. Int. J. Mol. Sci. 2020, 21, 6639

2021 ◽  
Vol 22 (9) ◽  
pp. 4366
Author(s):  
Rebecca L. Paszkiewicz ◽  
Richard N. Bergman ◽  
Roberta S. Santos ◽  
Aaron P. Frank ◽  
Orison O. Woolcott ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Central Effects

The authors wish to make the following corrections to this paper [...]

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