ERRATUM

1968 ◽  
Vol 49 (2) ◽  
pp. 223-223
Keyword(s):  
Oxygen Consumption ◽  
Continuous Recording ◽  
Natural Conditions

CHASE, A. M., UNWIN, D. M. & BROWN, R. H. J. (1968). A simple electrolytic respirometer for the continuous recording of oxygen consumption under constant and natural conditions. J. Exp. Biol. 48, 207-215. Page 210. Figures 2 and 3. For Scale: 1 in read Scale: ¼ in.

A Simple Electrolytic Respirometer for the Continuous Recording of Oxygen Consumption Under Constant and Natural Conditions

1968 ◽  
Vol 48 (1) ◽  
pp. 207-215
Author(s):  
ANN M. CHASE ◽  
D. M. UNWIN ◽  
R. H. J. BROWN
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Continuous Recording ◽  
Natural Conditions ◽  
Air Breathing ◽  
Oxygen Levels ◽  
Rate Of Oxygen Consumption

1. The principles involved in the design of an electrolytic respirometer are set out. 2. A respirometer is described for air-breathing animals which allows the continuous recording over long periods (up to two weeks) of oxygen consumption at rates of the order of 10-100 µl. per hour. 3. Provision is made for maintaining the temperature, pressure, and carbon dioxide and oxygen levels constant and at atmospheric values. 4. A new design of recorder displays the results directly as rate of oxygen consumption. 5. The features of the apparatus are discussed with reference to specific requirements.

scholarly journals Fish in habitats with higher motorboat disturbance show reduced sensitivity to motorboat noise

2018 ◽  
Vol 14 (10) ◽  
pp. 20180441 ◽  
Author(s):  
Harry R. Harding ◽  
Timothy A. C. Gordon ◽  
Rachel E. Hsuan ◽  
Alex C. E. Mackaness ◽  
Andrew N. Radford ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Consumption Rate ◽  
Local Population ◽  
Cichlid Fish ◽  
Noise Pollution ◽  
Anthropogenic Noise ◽  
Disturbance History ◽  
Natural Conditions ◽  
Population Responses ◽  
The Past

Anthropogenic noise can negatively impact many taxa worldwide. It is possible that in noisy, high-disturbance environments, the range and severity of impacts could diminish over time, but the influence of previous disturbance remains untested in natural conditions. This study demonstrates the effects of motorboat noise on the physiology of an endemic cichlid fish in Lake Malawi. Exposure to motorboats (driven 20–100 m from fish) and loudspeaker playback of motorboat noise both elevated the oxygen-consumption rate at a single lower-disturbance site, characterized by low historic and current motorboat activity. Repeating this assay at further lower-disturbance sites revealed a consistent effect of elevated oxygen consumption in response to motorboat disturbance. However, when similar trials were repeated at four higher-disturbance sites, no effect of motorboat exposure was detected. These results demonstrate that disturbance history can affect local population responses to noise. Action regarding noise pollution should consider the past, as well as the present, when planning for the future.

Continuous recording of C14O2 excretion and O2 consumption by rats

1965 ◽  
Vol 20 (3) ◽  
pp. 558-560 ◽  
Author(s):  
M. W. Simpson-Morgan
Keyword(s):  
Oxygen Consumption ◽  
Oxidative Metabolism ◽  
Respiratory Quotient ◽  
Continuous Recording ◽  
Laboratory Animals ◽  
O2 Consumption ◽  
Labeled Compounds ◽  
Small Laboratory

An apparatus is described with which the O2 consumption and C14O2 excretion of small laboratory animals can be recorded and integrated continuously during the course of experiments with C14-labeled compounds. In addition, the total CO2 production throughout intervals can be determined and the respiratory quotient calculated. The oxygen consumption apparatus is simple, inexpensive, and sensitive, and can be used in any closed metabolism system. apparatus; isotope; oxidative metabolism Submitted on July 10, 1964

Energy savings from vocal regulation of ambient temperature by 3-day-old domestic chicks

1996 ◽  
Vol 74 (4) ◽  
pp. 599-605 ◽  
Author(s):  
Anton Espira ◽  
Roger M. Evans
Keyword(s):  
Oxygen Consumption ◽  
Ambient Temperature ◽  
Thermal Gradient ◽  
Energy Savings ◽  
Net Energy ◽  
Natural Conditions ◽  
Ambient Temperatures ◽  
Domestic Chicks ◽  
Important Means ◽  
Cold Challenge

Precocial domestic chicks (Gallus domesticus) become endothermic at or soon after hatching, but when chilled still vocalize to solicit heat from a parent or surrogate. In this study, we examined the potential energy savings resulting from vocal solicitation of heat by comparing the oxygen consumption of 3-day-old chicks facing a cold challenge of 20 °C with and without the option of regulating ambient temperature by vocally soliciting 2-min periods of rewarming at 35 °C from a surrogate parent in the laboratory. Body temperature was unaffected by vocal regulation, but the thermal gradient between body and ambient temperature was reduced by 5.0 ± 0.4 °C (mean ± SE). Mass-specific oxygen consumption [Formula: see text] increased by 62.5% to a near steady state mean of 3.64 mL∙g−1∙h−1 during constant chilling at 20 °C, but increased by only 48.1%, to 3.08 mL∙g−1∙h−1, during vocal regulation. Relative to chilled controls, vocally regulating chicks had a mean net energy saving of 15.4% during the final, stable 15 min of testing. Vocal solicitation of heat from a brooding parent seems likely to be an important means of saving energy expended in thermoregulation in some precocial species when young chicks are exposed to low ambient temperatures under natural conditions.

Clinical and Experimental Analysis of 201Thallium Uptake of the Heart

1978 ◽  
Vol 17 (04) ◽  
pp. 142-148
Author(s):  
U. Büll ◽  
S. Bürger ◽  
B. E. Strauer
Keyword(s):  
Oxygen Consumption ◽  
Left Ventricle ◽  
Muscle Mass ◽  
Myocardial Oxygen Consumption ◽  
Animal Experiments ◽  
Left Ventricular ◽  
Left Ventricular Wall ◽  
Ventricular Wall ◽  
Flow Measurements ◽  
Myocardial Flow

Studies were carried out in order to determine the factors influencing myocardial 201T1 uptake. A total of 158 patients was examined with regard to both 201T1 uptake and the assessment of left ventricular and coronary function (e. g. quantitative ventriculography, coronary arteriography, coronary blood flow measurements). Moreover, 42 animal experiments (closed chest cat) were performed. The results demonstrate that:1) 201T1 uptake in the normal and hypertrophied human heart is linearly correlated with the muscle mass of the left ventricle (LVMM);2) 201T1 uptake is enhanced in the inner (subendocardial) layer and is decreased in the outer (subepicardial) layer of the left ventricular wall. The 201T1 uptake of the right ventricle is 40% lower in comparison to the left ventricle;3) the basic correlation between 201T1 uptake and LVMM is influenced by alterations of both myocardial flow and myocardial oxygen consumption; and4) inotropic interventions (isoproterenol, calcium, norepinephrine) as well as coronary dilatation (dipyridamole) may considerably augment 201T1 uptake in accordance with changes in myocardial oxygen consumption and/or myocardial flow.It is concluded that myocardial 201T1 uptake is determined by multiple factors. The major determinants have been shown to include (i) muscle mass, (ii) myocardial flow and (iii) myocardial oxygen consumption. The clinical data obtained from patient groups with normal ventricular function, with coronary artery disease, with left ventricular wall motion abnormalities and with different degree of left ventricular hypertrophy are correlated with quantitated myocardial 201T1 uptake.

Sign in / Sign up

Export Citation Format

Share Document