Factors affecting oxygen consumption in the woodlouse Porcellio scaber latr

Oecologia ◽  
1974 ◽  
Vol 16 (1) ◽  
pp. 31-51 ◽  
Author(s):  
R. C. Newell ◽  
W. Wieser ◽  
V. I. Pye
Keyword(s):  
Oxygen Consumption ◽  
Porcellio Scaber ◽  
Factors Affecting

Some Factors Affecting the Oxygen Consumption of Asellus

1960 ◽  
Vol 37 (4) ◽  
pp. 706-718
Author(s):  
R. W. EDWARDS ◽  
M. A. LEARNER
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Constant Volume ◽  
Asellus Aquaticus ◽  
Dissolved Oxygen Concentration ◽  
Factors Affecting ◽  
Consumption Rates ◽  
Rate Of Oxygen Consumption ◽  
Wet Weight ◽  
Males And Females

1. The oxygen-consumption rates of Asellus aquaticus (males and females) have been measured at 10 and 20° C. using a constant-volume respirometer, and the effect of starvation for 24 hr. investigated. The oxygen consumption is approximately proportional to the 0.7 power of the wet weight. The rate of oxygen consumption at 20° C. is greater than at 10° C. by a factor of 1.5. 2. The oxygen-consumption rates of A. aquaticus and A. meridianus have been measured at 20° C. in a flowing-water respirometer employing a polarographic technique for the measurement of dissolved-oxygen concentrations. The oxygen consumptions of A. aquaticus and A. meridianus are similar and decrease by 15-20% when the dissolved-oxygen concentration falls from 8.3 to 1.5 p.p.m. 3. The oxygen consumption of A. aquaticus is between 35 and 75% higher in the polarographic respirometer than in the constant-volume respirometer.

scholarly journals Phosphorescence quenching microrespirometry of skeletal muscle in situ

2011 ◽  
Vol 300 (1) ◽  
pp. H135-H143 ◽  
Author(s):  
Aleksander S. Golub ◽  
Michael A. Tevald ◽  
Roland N. Pittman
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Consumption ◽  
Initial Slope ◽  
Phosphorescence Quenching ◽  
Factors Affecting ◽  
External Sources ◽  
Disappearance Curve ◽  
Residual Blood ◽  
532 Nm

We have developed an optical method for the evaluation of the oxygen consumption (V̇o2) in microscopic volumes of spinotrapezius muscle. Using phosphorescence quenching microscopy (PQM) for the measurement of interstitial Po2, together with rapid pneumatic compression of the organ, we recorded the oxygen disappearance curve (ODC) in the muscle of the anesthetized rats. A 0.6-mm diameter area in the tissue, preloaded with the phosphorescent oxygen probe, was excited once a second by a 532-nm Q-switched laser with pulse duration of 15 ns. Each of the evoked phosphorescence decays was analyzed to obtain a sequence of Po2 values that constituted the ODC. Following flow arrest and tissue compression, the interstitial Po2 decreased rapidly and the initial slope of the ODC was used to calculate the V̇o2. Special analysis of instrumental factors affecting the ODC was performed, and the resulting model was used for evaluation of V̇o2. The calculation was based on the observation of only a small amount of residual blood in the tissue after compression. The contribution of oxygen photoconsumption by PQM and oxygen inflow from external sources was evaluated in specially designed tests. The average oxygen consumption of the rat spinotrapezius muscle was V̇o2 = 123.4 ± 13.4 (SE) nl O2/cm3·s ( N = 38, within 6 muscles) at a baseline interstitial Po2 of 50.8 ± 2.9 mmHg. This technique has opened the opportunity for monitoring respiration rates in microscopic volumes of functioning skeletal muscle.

Der Sauerstoffverbrauch und der Gehalt an Ca, Cu und einigen anderen Spurenelementen bei terrestrischen Asseln

1961 ◽  
Vol 16 (12) ◽  
pp. 816-819 ◽  
Author(s):  
Wolfgang Wieser
Keyword(s):  
Oxygen Consumption ◽  
Copper Content ◽  
Inverse Relationship ◽  
Dry Weight ◽  
Porcellio Scaber ◽  
High Copper ◽  
High Copper Content

The oxygen consumption and the content of Ca, Cu, K, Sr, Zn, Fe, P and Mg was determined in several terrestric isopods. Porcellio scaber, Syspastus brevicornis and the three species of Armadillidium investigated display significant differences in their calcium contents and there is an inverse relationship between the latter and the oxygen consumption of the animals at 20 °C. The Qo2 of S. brevicornis is 13 ± 3.5 mm3/g/hr, the lowest ever recorded for a crustacean at 20 °C. The copper content of the isopods is high and suggests the presence of hemocyanin. It is highest in a population of P. scaber from Cornwall, England, where it amounts to approximately 0,1% of the dry weight of the animals. Most of the copper is present in the four hepatic tubules (hepatopancreas) which, in one sample from the population mentioned above, contained 1.4% copper, the highest value ever found in an invertebrate. The Qo2 of animals with more or less filled gut seems to be higher in the population with the high copper content, whereas in animals with half empty or empty gut the oxygen consumption is the same in the three populations of P. scaber studied.

scholarly journals Factors affecting dry matter intake and its prediction for Holstein cows

2003 ◽  
Vol 57 (3-4) ◽  
pp. 149-158
Author(s):  
Dragan Glamocic ◽  
Goran Grubic ◽  
Nenad Djordjevic
Keyword(s):  
Oxygen Consumption ◽  
Health Effects ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Holstein Cows ◽  
Prediction Equations ◽  
Factors Affecting ◽  
Adverse Health Effects ◽  
Nutrient Use ◽  
Feed Costs

Many factors affects dry matter intake (DMI). Individual theories based on physical fill of the reticulorumen, metabolic-feedback factors, or oxygen consumption have been proposed to determine and predict DMI (NRC, 2001). Prediction of DMI is fundamentally important in nutrition because it establishes the amount of nutrients available to an animal for health and production. Actual or accurately estimated DMI is important for the formulation of diets to prevent underfeeding or overfeeding of nutrients and to promote efficient nutrient use. Underfeeding of nutrients restricts production and can affect the health of an animal. Overfeeding of nutrients increases feed costs, can results in excessive excretion of nutrients into the environment, and at excessively high amounts may be toxic or cause adverse health effects. Several DMI prediction equations have been developed for use in the field, but only a few have been given in this paper.

Factors affecting oxygen consumption in the scallopChlamys delicatula(Hutton)

Ophelia ◽  
1980 ◽  
Vol 19 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Joan Mackay ◽  
Sandra E. Shumway
Keyword(s):  
Oxygen Consumption ◽  
Factors Affecting

FACTORS AFFECTING THE INCORPORATION OF RADIOACTIVE PHOSPHATE INTO THE PHOSPHOLIPIDS OF SLICES OF CAT BRAIN

1954 ◽  
Vol 32 (1) ◽  
pp. 50-59 ◽  
Author(s):  
K. P. Strickland
Keyword(s):  
Oxygen Consumption ◽  
Inorganic Phosphate ◽  
Brain Slices ◽  
Phospholipid Fraction ◽  
Metabolic Inhibitors ◽  
Factors Affecting ◽  
Wide Range ◽  
Cat Brain

Slices of cat brain respiring in a Krebs–Ringer bicarbonate medium were found to incorporate radioactive inorganic phosphate (P32) into the phospholipid fraction. The addition of glucose or mannose increased the incorporation of P32 into the phospholipids. Fructose caused a small increase, whereas galactose was without effect. Pyruvate and lactate increased the incorporation of P32 into the phospholipids. Succinate, L (+)-glutamate, D (−)-glutamate, α keto-glutarate, citrate, and L-malate failed to support the incorporation.Anaerobic conditions and homogenization of the tissue prevented the in vitro incorporation of P32 into the phospholipids of cat brain. A wide range of metabolic inhibitors (cyanide, azide, malononitrile, chloretone, nembutal, iodoacetate, and fluoride), in concentrations that inhibit the oxygen consumption of brain slices, inhibited the incorporation. The incorporation was also inhibited by 2,4-dinitrophenol in concentrations that do not decrease the oxygen consumption of brain slices.These findings indicated that the incorporation of P32 into the phospholipids of slices of cat brain is a metabolic phenomenon and is dependent upon the maintenance of an adequate phosphorylating mechanism within the slice.

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