Correlation Of Oxygen Consumption Research Articles

Correlation of oxygen consumption with growth and red pigment production of Monascus purpureus in solid state fermentation of rice

Since aeration has a crucial role in mass and heat transfer during solid-state fermentation (SSF), the aim of the present work was to find out how it related to biomass and red pigment production of Monascus purpureus TISTR3615 during SSF. The fungal consumption of oxygen, one of the air's constituents important for fungal metabolism, was used to explain the relationship between the aeration rate, the fungal growth, and the red pigment production during the SSF of rice. Findings showed that at increased aeration rates, the fungus absorbed more oxygen, which boosted fungal growth but decreased red pigment production. Conversely, red pigment production increased when the fungus' oxygen consumption decreased. Regression equations with an acceptable R2 were used to explain the relationship between M. purpureus' red pigment production and its oxygen consumption and aeration rate. The ideal oxygen concentration for increasing M. purpureus' capacity to produce red pigment was 0.0685 mmol/day/g of dry biomass, which produced red pigment at around 2,897 AU500nm/g of dry biomass. However, the optimal oxygen consumption of the fungus for overall red pigment production (including growth impact) was 1.390 mmol/day/g of dry biomass, which produced red pigment at around 2,787 AU500nm/g of dry fermented rice. The results of the present work could potentially be utilised in developing M. purpureus' red pigment production approach.

Correlation of Oxygen Consumption and Patient Day with Invasive Mechanical Ventilation in a Hospital in Sao Paulo during Covid-19 Pandemic

Background: The new coronavirus led the world into the pandemic known as COVID-19. Still, without any effective treatment, oxygen therapy is the most used treatment for patients. Without proper management of this medicinal gas, lives can be lost for lack of it. Aim: Find an indicator of a strong correlation with oxygen consumption. Methods: A single-center retrospective study, that evaluated the oxygen consumption billing data and patient-day indicator of Central Institute of HCFMUSP between 2019 and 2020. Results: A total of 380,245 patient days were analyzed. A strong correlation was identified between oxygen consumption and patient day with invasive mechanical ventilation (0.92). An average of 41.6 (± 7.8) cubic meters per patient day with invasive mechanical ventilation was found. Conclusion: There is a strong correlation between oxygen consumption in cubic meters and patient days with invasive mechanical ventilation at the Central Institute of HCFMUSP. The average values of consumption per patient day can help in planning oxygen management in other hospitals.

Correlation of oxygen consumption, cytochrome c oxidase, and cytochrome c oxidase subunit I gene expression in the termination of larval diapause in the bamboo borer, Omphisa fuscidentalis

The moth Omphisa fuscidentalis (Lepidoptera, Pyralidae) is a univoltine insect with a larval diapause period lasting up to 9 months. We studied changes in O 2 consumption in conjunction with cytochrome c oxidase activity and cytochrome c oxidase subunit I ( cox1) gene expression. O 2 consumption changed within a day, showing a supradian rhythm with a ca.12-h cycle at 25 °C. During the first two-thirds of the diapause period, from October to March, O 2 consumption was constant until January and then increased by March. Topical application of methoprene, a juvenile hormone analog (JHA), to diapausing larvae terminated the diapause and was associated with an increase in O 2 consumption rate at diapause termination. In JHA-treated larvae, cytochrome c oxidase activity in fat bodies was high at the beginning of the prepupal period and highest at pupation. cox1 expression in fat bodies displayed a transient peak 8 days after JHA application and peaked in the prepupal period. Taken together, our results show that the break of diapause by JHA is associated with the activation of cox1, bringing about an increase in cytochrome c oxidase activity, followed by an increase in O 2 consumption rate.

Opercular differential pressure as a predictor of metabolic oxygen demand in the starry flounder

The feasibility of using a differential pressure sensor connected to an acoustic telemetry device to monitor opercular activity as a correlate of oxygen consumption was investigated. Four starry flounders Platichthys stellatus were fitted with a miniature differential pressure sensor mounted close to the operculum. A cannula was connected to the sensor and inserted under the operculum, inside the branchial cavity. Measurements of oxygen consumption and opercular activity were carried out over a broad range of metabolic activity, from the post‐surgery stress (high metabolic rate) to routine metabolic rate the following day. Relationships between differential pressure changes (rate and amplitude) were highly correlated with oxygen consumption (r2 = 0·74 and 0·60 respectively). The results indicate that monitoring opercular activity offers an alternative method for measuring aerobic metabolism in free‐swimming fishes in nature.

In situ and laboratory assessment of heart rate in a Mediterranean limpet using a noninvasive technique.

Heart rate of the Mediterranean limpet Patella caerulea L. was investigated on the natural shore and in the laboratory by using a technique based on infrared phototransducers. Field recording occurred in the Gulf of Trieste (northern Adriatic) during March and June 1997. A consistent dependence of heart rate on temperature was observed in limpets both when submerged and when exposed to air in the two periods, but thermal acclimation was evident. During spontaneous activity at high tide, heart rate increased 1.5-1.7 times the values observed during resting in water at corresponding temperatures. The dependence of heart rate on temperature (10 degrees, 16 degrees, and 22 degrees C) and size (wet weight <1.25 and >1.30 g) in submerged limpets from different populations (northern Adriatic and Tyrrhenian) was tested in the laboratory by adopting a factorial design. The results showed a marked effect of temperature, body weight, and their interaction, independent from the site of origin. Smaller limpets showed a linear increase of heart rate in the whole range of temperature tests, while in the larger ones the increase between 10 degrees and 16 degrees C was greater than between 16 degrees and 22 degrees C. Heart rate decreased with increasing body size at control (16 degrees C) and high (22 degrees C) temperature, while at lower temperature (10 degrees C) no effect of body size was evident. When removed from their home scar, limpets increased heart rate to about 1.5 times the reference value. Finally, correlation of oxygen consumption with heart rate of submerged limpets maintained at a different temperature (10 degrees -22 degrees C) was statistically significant.

Response of erythrocytic 2,3-diphosphoglycerate to strenuous exercise.

Since increases of erythrocytic 2,3-diphosphoglycerate (2,3-DPG) have been shown to enhance the release of oxygen from hemoglobin, experiments were designed to evaluate the response of 2,3-DPG to two different work-loads in 13 fasted human subjects. No signficant mean change in 2.3-DPG was found following 16 min of strenuous exercise on a bicycle ergometer, but when the subjects were subjected later to a greater workload for 20 min, there was a significant mean decrease in 2.3-DPG despite much individual variation. In addition, there was a significant positive correlation of 2.3-DPG reduction with increases in postexercise lactate, and a significant inverse correlation of oxygen consumption during exercise with postexercise lactate. The data suggest that the 2.3-DPG mechanism may not be compensating in exercise when the workload requires a preponderance of anaerobic metabolism promoting lactacidaemia.

Studies on the Queensland lungfish, Neoceratodus forsteri (Krefft). 3. Aerial respiration in relation to habits.

Field observations made on the Mary and Burnett rivers in Queensland show that seasonal stagnancy and deoxygenation are unlikely to be factors accounting for the air-breathing habit in Neoceratodus, as current theory suggests. An alternative hypothesis that the lung is an accessory respiratory organ during active periods, was suggested by current work which showed that Neoceratodus is more active nocturnally and surfaces to take air more often at night. Respirometry studies on juvenile fish confirmed this, for the oxygen consumption of forcibly active fish prevented from surfacing while in the respirometer, was consistently lower than that of fish allowed to surface. At 25�C, active fish allowed to surface had an oxygen consumption of 0.07 ml g-l hr-l, derived from branchial respiration at a rate of 67 beats/min supplemented by use of the lung. When prevented from surfacing however the oxygen consumption fell to approximately 0.05 ml g-l hr-1, derived from gills alone, but with a branchial pumping rate of 80 beats/min. This correlation of oxygen consumption with branchial pumping emphasizes the limit placed on the fish by its gills, whereas the higher oxygen consumption exhibited by active fish allowed to surface indicates the value of the lung as an accessory respiratory organ, allowing more vigorous reaction to a stimulus than would be possible with gills only.

CORRELATION OF OXYGEN CONSUMPTION WITH SWELLING AND LIPID PEROXIDE FORMATION WHEN MITOCHONDRIA ARE TREATED WITH THE SWELLING-INDUCING AGENTS FE2+, GLUTATHIONE, ASCORBATE, OR PHOSPHATE.

CORRELATION OF OXYGEN CONSUMPTION WITH SWELLING AND LIPID PEROXIDE FORMATION WHEN MITOCHONDRIA ARE TREATED WITH THE SWELLING-INDUCING AGENTS FE2+, GLUTATHIONE, ASCORBATE, OR PHOSPHATE.