The oxygen consumption and swimming activity of the amphipod Gammarus oceanicus at different temperatures

The oxygen consumption [Formula: see text] of isolated segments of 40 human umbilical arteries was measured at different temperatures from 5 °C to 37 °C with a modified Fenn microrespirometer. The values varied from 8 μl/g per h at 8 °C to 70 μl/g per h at 37 °C. The Arrhenius plot was nonlinear, and the Q10 varied from 0.11 (30–40 °C) to 1.8 (20–30 °C) and 7.1 (10–20 °C). This suggests that the metabolic processes may be different at high and low temperatures. The results were consistent for at least 5 h post partum, and did not seem to vary from one segment of the cord to another.

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Effect of Temperature and Time on Oxygen Consumption by Olive Fruit: Empirical Study and Simulation in a Non-Ventilated Container

Fermentation ◽

10.3390/fermentation7040200 ◽

2021 ◽

Vol 7 (4) ◽

pp. 200

Author(s):

Eddy Plasquy ◽

María C. Florido ◽

Rafael Rubén Sola-Guirado ◽

José María García Martos ◽

Juan Francisco García Martín

Keyword(s):

Oxygen Consumption ◽

Anaerobic Respiration ◽

Co2 Production ◽

Effect Of Temperature ◽

Critical Threshold ◽

Irreversible Damage ◽

Olive Fruit ◽

Different Temperatures ◽

Arrhenius Function

Fermentation processes within olive fruit jeopardize the quality of the extracted oil. Aeration, temperature, and time play a crucial role in attaining the critical threshold at which an aerobic respiration shifts towards anaerobic. In this work, the O2 consumption and CO2 production of olive fruit kept in a closed container at different temperatures (5–45 °C) were measured over 7 h. The data allowed us to describe the relationship between the temperature and the respiration rate as an Arrhenius function and simulate the oxygen consumption in the inner part of a container full of fruit with low aeration, considering the generated respiration heat over time. The simulation revealed that olives risk shifting to anaerobic respiration after 3 h at 25 °C and less than 2 h at 35 °C when kept in a non-ventilated environment. The results underline the irreversible damage that high day temperatures can produce during the time before fruit processing, especially during transport. Lowering, as soon as possible, the field temperature thus comes to the fore as a necessary strategy to guarantee the quality of the olives before their processing, like most of the fruit that is harvested at excessive temperatures.

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EFFECTS OF X-RADIATION AND OF METABOLIC INHIBITORS ON RAT THYMOCYTES IN VITRO

Canadian Journal of Biochemistry and Physiology ◽

10.1139/o62-174 ◽

1962 ◽

Vol 40 (11) ◽

pp. 1535-1552 ◽

Cited By ~ 13

Author(s):

D. K. Myers ◽

Donna E. DeWolfe ◽

Kimiko Araki

Keyword(s):

Oxygen Consumption ◽

Normal Cell ◽

Cell Metabolism ◽

Metabolic Inhibitors ◽

Low Doses ◽

Ph Values ◽

Atp Levels ◽

Different Temperatures ◽

High Doses

The survival of X-irradiated thymocytes in vitro was studied after incubation for various periods of time and at different pH values as well as at different temperatures. Death at 25 °C following exposure to high doses of X-radiation may be due to the liberation of destructive enzymes. The effects of high doses could be largely prevented by addition of nicotinamide after irradiation.The cause of cell death at 37 °C following exposure to low doses of X-radiation is still uncertain. Some metabolic inhibitors also showed a considerable difference in their toxicity to thymocytes at 37 °C and at 25 °C. Dinitrophenol, for example, was highly toxic at 37 °C but almost ineffective in killing cells at 25 °C, even though it produced similar decreases in ATP levels at both temperatures. The marked difference in survival of irradiated thymocytes at 37 °C and at 25 °C could therefore be explained if low doses of X-radiation interfered with the normal cell metabolism. However, low doses of radiation, unlike dinitrophenol, did not produce any immediate decrease either in ATP levels or in oxygen consumption of thymocyte suspensions.

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The Effect of Swimming Activity and Section of the Vagus Nerves on Heart Rate in Rainbow Trout

Journal of Experimental Biology ◽

10.1242/jeb.60.2.305 ◽

1974 ◽

Vol 60 (2) ◽

pp. 305-319 ◽

Cited By ~ 1

Author(s):

IMANTS G. PRIEDE

Keyword(s):

Heart Rate ◽

Maximum Rate ◽

Critical Speed ◽

Swimming Activity ◽

Vagus Nerves ◽

Maximum Heart Rate ◽

Heart Rates ◽

Cardiac Responses ◽

Different Temperatures ◽

Speed Up

1. Heart rates associated with swimming activity were measured in intact and vagotomized fish at 6.5 and 15 °C. 2. Low swimming speeds had no effect on heart rate but above a threshold speed it increased logarithmically with swimming speed up to the critical speed and maximum heart rate. 3. Times for recovery after exercise increased rapidly above the critical speed. 4. Bilaterally vagotomized fish at 6.5 °C showed high resting heart rates and erratic cardiac responses to exercise. 5. In bilaterally vagotomized fish at 15 °C heart rates were normal except for a low maximum rate. 6. It is concluded that the vagus nerve can function differently at different temperatures.

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Temperature preference and oxygen consumption of the largemouth bassMicropterus salmoides(Lacépède) acclimated to different temperatures

Aquaculture Research ◽

10.1111/j.1365-2109.2007.01817.x ◽

2007 ◽

Vol 38 (13) ◽

pp. 1387-1394 ◽

Cited By ~ 41

Author(s):

Fernando Díaz ◽

Ana Denisse Re ◽

Ricardo A González ◽

L Noemi Sánchez ◽

Gustavo Leyva ◽

...

Keyword(s):

Oxygen Consumption ◽

Temperature Preference ◽

Different Temperatures

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Diel rhythms of swimming activity and oxygen consumption in Gobiusculus flavescens (Fabricius) and Pomatoschistus minutus (Pallas) (Teleostei: Gobiidae)

Journal of Experimental Marine Biology and Ecology ◽

10.1016/s0022-0981(97)00073-7 ◽

1997 ◽

Vol 218 (2) ◽

pp. 187-198 ◽

Cited By ~ 21

Author(s):

Helmut Thetmeyer

Keyword(s):

Oxygen Consumption ◽

Swimming Activity ◽

Diel Rhythms ◽

Pomatoschistus Minutus

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Acute and Final Temperature Preferenda as Predictors of Lake St. Clair Fish Catchability

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f91-168 ◽

1991 ◽

Vol 48 (8) ◽

pp. 1408-1418 ◽

Cited By ~ 7

Author(s):

Roy G. Danzmann ◽

Don S. MacLennan ◽

Don G. Hector ◽

Paul D. N. Hebert ◽

Jurek Kolasa

Keyword(s):

Regression Analysis ◽

Water Temperature ◽

Fish Species ◽

Swimming Activity ◽

Final Temperature ◽

Preferred Temperature ◽

Different Temperatures ◽

Temperature Preferences ◽

Geographic Distributions

Geographic distributions of major fish species resident in Lake St. Clair, field assessments of their seasonal thermal distributions, and laboratory determinations of their median and maximum final temperature preferenda were compared with their catchability at different temperatures. Fish catchability at various temperatures was estimated (regression analysis) during the fall pound net set survey (1977–88) using number of fish caught per 24-h net set as the dependent variable. Swimming activity was expected to be higher at temperatures closest to the species' preferred temperature, thereby increasing catchability. Maximum final temperature preferendum was the best predictor of observed fish temperature preferences. Geographic distributions and median final temperature preferenda were better predictors than summer or fall seasonal thermal distributions. Acute temperature preferenda were also good predictors of fish catchability at different temperatures. Of the 22 species examined, the catchability of Centrarchidae (five of six species), Catostomidae (two of five species), Clupeidae (one species), Ictaluridae (two species), and Percichthyidae (two species) was greater in warmer water, while the catchability of Amiidae (one species), Cyprinidae (one species), Catostomidae (three of five species), Esocidae (one species), Percidae (two species), and Sciaenidae (one species) increased in colder water. Temperature significantly accounted for differences in catchability among most species (14 of 22).

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