scholarly journals ON THE RESPIRATORY QUOTIENT OF LUPINUS ALBUS AS A FUNCTION OF TEMPERATURE

1932 ◽  
Vol 15 (5) ◽  
pp. 561-569 ◽  
Author(s):  
Pei-Sung Tang
Keyword(s):  
Oxygen Consumption ◽  
Respiratory Quotient ◽  
Lupinus Albus ◽  
Experimental Results ◽  
Co2 Production ◽  
Temperature Characteristics ◽  
Germinating Seeds ◽  
Quantitative Treatment

The temperature characteristics for the oxygen consumption and CO2-production of the germinating seeds of Lupinus albus were previously found to be different. It was predicted qualitatively that the respiratory quotient of the seed should be a function of temperature. A quantitative treatment is presented here, relating the change of the respiratory quotient with temperature and the temperature characteristics. Experimental results agree satisfactorily with the calculated value.

scholarly journals TEMPERATURE CHARACTERISTICS FOR THE OXYGEN CONSUMPTION OF GERMINATING SEEDS OF LUPINUS ALBUS AND ZEA MAYS

1931 ◽  
Vol 14 (5) ◽  
pp. 631-641 ◽  
Author(s):  
Pei-Sung Tang
Keyword(s):  
Zea Mays ◽  
Oxygen Consumption ◽  
Critical Temperature ◽  
Lupinus Albus ◽  
Temperature Characteristic ◽  
Temperature Characteristics ◽  
Rate Of Oxygen Consumption ◽  
Germinating Seeds

The rate of oxygen consumption by germinating seeds of Lupinus albus and of Zea mays was studied as a function of temperature (7–26°C.). The Warburg manometer technique was used, with slight modifications. Above and below a critical temperature at 19.5°C. the temperature characteristic for oxygen consumption by Lupinus albus was found to be µ = 11,700± and 16,600 respectively. The same critical temperature was encountered in the case of Zea mays, with temperature characteristics µ = 13,100± above and µ = 21,050 below that temperature.

scholarly journals TEMPERATURE CHARACTERISTICS FOR THE PRODUCTION OF CO2 BY GERMINATING SEEDS OF LUPINUS ALBUS AND ZEA MAYS

1931 ◽  
Vol 15 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Pei-Sung Tang
Keyword(s):  
Zea Mays ◽  
Oxygen Consumption ◽  
Critical Temperature ◽  
Lupinus Albus ◽  
Temperature Characteristic ◽  
Titration Method ◽  
Temperature Characteristics ◽  
The Difference ◽  
Germinating Seeds

The rates of production of CO2 by germinating seeds of Lupinus albus and Zea mays were studied between temperatures 12.5° and 25°C. with the HCl-Ba(OH)2 titration method. The temperature characteristics found are different from those previously obtained for the oxygen consumption of the same seeds germinated in the same manner. For Lupinus, the temperature characteristics above and below the critical temperature of 20° are 16,100 ± and 24,000 ± calories respectively. For Zea, no evidence of a critical temperature was found in this region, and the temperature characteristic is 20,750 ± calories throughout the range of temperature tested. The possible interpretations of the difference in the values of temperature characteristics for oxygen consumption and for production of CO2 are noted.

GASEOUS METABOLISM IN PREMATURE INFANTS AT 32-34°C AMBIENT TEMPERATURE

PEDIATRICS ◽  
1964 ◽  
Vol 33 (1) ◽  
pp. 75-82
Author(s):  
Forrest H. Adams ◽  
Tetsuro Fujiwara ◽  
Robert Spears ◽  
Joan Hodgman
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Premature Infants ◽  
Rectal Temperature ◽  
Respiratory Quotient ◽  
Carbon Dioxide Production ◽  
Open Circuit ◽  
Co2 Production ◽  
O2 Consumption ◽  
Rate Of Increase

Thirty-four measurements of oxygen consumption, carbon dioxide production, respiratory quotient, and rectal temperature were made on 22 premature infants with ages ranging from 2½ hours to 18 days. The studies were conducted at 32-34°C utilizing an open circuit apparatus and a specially designed climatized chamber. Oxygen consumption and carbon dioxide production were lowest in the first 12 hours and increased thereafter. The rate of increase in O2 consumption was greater than that of CO2 production, with a consequent fall in respiratory quotient during the first 76 hours of life. A reverse relation of O2 consumption and CO2 production was found following the 4th day of life with a consequent rise in respiratory quotient. There was a close correlation between O2 consumption and rectal temperature regardless of age. A respiratory quotient below the value of 0.707 for fat metabolism was observed in 7 premature infants with ages ranging from 24 to 76 hours.

scholarly journals THE EFFECTS OF CO AND LIGHT ON THE OXYGEN CONSUMPTION AND ON THE PRODUCTION OF CO2 BY GERMINATING SEEDS OF LUPINUS ALBUS

1932 ◽  
Vol 15 (6) ◽  
pp. 655-665 ◽  
Author(s):  
Pei-Sung Tang
Keyword(s):  
Oxygen Consumption ◽  
Gas Exchange ◽  
Lupinus Albus ◽  
Maximum Extent ◽  
Rate Of Oxygen Consumption ◽  
Germinating Seeds

The consumption of oxygen by germinating seeds of Lupinus albus can be reversibly inhibited by CO to a maximum extent of 36 per cent with a mixture of 24 per cent O2 and 76 per cent CO at 18°, in darkness. This inhibition is completely abolished when the seed is illuminated. On returning to air, after a period in the CO-O2 mixture, the rate of oxygen consumption is accelerated to as much as 68 per cent over what it had been previously, in air. The production of CO2 is apparently not inhibited by CO. The bearing of these findings on the study of the rates of gas exchange of the seeds as a function of temperature is discussed.

scholarly journals A Single Dose of Goji Berries Does Not Affect Postprandial Energy Expenditure and Substrate Oxidation in Healthy, Overweight Men

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
José J. van den Driessche ◽  
Jogchum Plat ◽  
Guy Plasqui ◽  
Ronald P. Mensink
Keyword(s):  
Oxygen Consumption ◽  
Single Dose ◽  
Glucose Metabolism ◽  
Energy Expenditure ◽  
Respiratory Quotient ◽  
Substrate Oxidation ◽  
Caloric Content ◽  
Lycium Barbarum ◽  
Meal Intake ◽  
Postprandial Energy Expenditure

Background and Aim. Increasing energy expenditure is an effective strategy for the prevention of obesity. In this respect, Lycium barbarum (goji berry) is of interest, as it has been shown to increase postprandial oxygen consumption. Although this suggests that energy expenditure was also increased, energy expenditure and substrate oxidation can only be assessed accurately when both oxygen consumption and carbon dioxide production are measured. We therefore investigated the effects of a single dose of Lycium barbarum fruit on postprandial energy expenditure and substrate oxidation in a randomized, double-blind crossover trial. In addition, markers of lipid and glucose metabolism were measured. Methods. Seventeen healthy, overweight men received in a random order a meal containing 25 grams of dried Lycium barbarum fruit or a control meal matched for caloric content and macronutrient composition. Energy expenditure and the respiratory quotient were determined using indirect calorimetry before and up to 4 hours after meal intake. Blood was sampled before and after meal intake at regular intervals for analyses of plasma glucose, serum triacylglycerol, and free fatty acid concentrations. Results. Energy expenditure significantly increased after the Lycium barbarum and control meal, but no differences were found between the meals (p=0.217). Postprandial changes in respiratory quotient (p=0.719) and concentrations of glucose (p=0.663), triacylglycerol (p=0.391), and free fatty acids (p=0.287) were also not affected by Lycium barbarum intake. Conclusions. A single dose of Lycium barbarum does not affect postprandial energy expenditure, substrate oxidation, and markers for lipid and glucose metabolism in healthy, overweight men.

Sediment metabolism in a transitional continental - marine area: The Albufera of Majorca (Balearic Islands, Spain)

1995 ◽  
Vol 46 (1) ◽  
pp. 45 ◽  
Author(s):  
P Lopez ◽  
M Vidal ◽  
X Lluch ◽  
JA Morgui
Keyword(s):  
Oxygen Consumption ◽  
Pore Water ◽  
Respiratory Quotient ◽  
Nutrient Dynamics ◽  
Anaerobic Respiration ◽  
Ammonium Phosphate ◽  
Nutrient Concentrations ◽  
Co2 Efflux ◽  
Marine Areas ◽  
Diffusive Fluxes

The concentrations of nutrients in sediment pore water and the fluxes of nutrients at the water-sediment interface were measured in a channel that joins continental and marine areas in the Albufera of Majorca in order to evaluate the role of sediments in the nutrient dynamics in this system. Upstream, surficial pore water presented lower values of Eh, which became negative in summer, whereas downstream Eh remained positive. Nutrient concentrations were especially high upstream, reaching 1000 mol L-1 of NH4 and 75 μmol L-1 of PO4 during summer. In summer, measured fluxes showed intense respiration upstream, with an oxygen consumption of 130 mg m-2 h-1 and a respiratory quotient near 4, which indicates dominance of anaerobic respiration. Total CO2 efflux and nutrient fluxes were also high, reaching 30.50 mmol m-2 h-1 for CO2, >2000 μmol m-2 h-1 for NH4 and 58 μmol m-2 h-1 for PO4. A substantial amount of the total CO2 efflux (14 mmol m-2 h-1) was due to calcium carbonate redissolution. Downstream, oxygen consumption, respiratory quotient and ammonium fluxes were lower (around 70 mg m-2 h-1, between 2 and 3, and <20 μmol m-2 h-1, respectively), which indicates a moderate rate of decomposition activity and suggests denitrification as the main respiratoy process. Differences between fluxes measured 'in situ' and those calculated from pore-water concentrations indicated non-diffusive fluxes upstream and suggest substantial denitrifying activity downstream. Extra keywords: benthic chambers, sediment fluxes, pore water, ammonium, phosphate.

Energy metabolism in hypnotic trance and sleep

1965 ◽  
Vol 20 (2) ◽  
pp. 308-310 ◽  
Author(s):  
Hrishikesh Jana
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Energy Metabolism ◽  
Respiratory Quotient ◽  
Metabolic Rates ◽  
Carbon Dioxide Elimination ◽  
Natural Sleep ◽  
Healthy Males

The energy metabolism of 14 healthy males was studied before and during a hypnotic trance in the basal state. Metabolic rates during the basal waking, the basal hypnotic trance and the basal sleep were also determined in three subjects for 3 consecutive days, respectively. It was observed that a hypnotic trance does not significantly influence the metabolic rates in a basal condition while natural sleep lowers the basal metabolic rates by 8.73%. hypnosis; oxygen consumption; carbon dioxide; elimination; respiratory quotient Submitted on April 7, 1964

scholarly journals Oxygen Consumption and CO2 Production in Canine Hemorrhagic Shock

1987 ◽  
Vol 3 (2) ◽  
pp. 85-85
Author(s):  
Ernest Benjamin ◽  
Thomas J. Iberti ◽  
Kathleen M. Kelly ◽  
David P. Katz ◽  
Mark J. Rosen
Keyword(s):  
Oxygen Consumption ◽  
Hemorrhagic Shock ◽  
Co2 Production
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