. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISCONTINUOUS RESPIRATION IN SILKWORM 125 in a capillary respirometer. This and other special methods will be discussed in the appropriate sections. Each type of experiment, unless otherwise noted, was performed on a minimum of five animals. THE CYCLE OF CARBON DIOXIDE RELEASE Figure 1 illustrates a typical experiment descriptive of the cyclic release of carbon dioxide. Here the respiratory exchange of a Cecropia pupa was measured over two successive 18-hour intervals. During the first period of 18 hours, sodium to LJ 1400 i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISCONTINUOUS RESPIRATION IN SILKWORM 125 in a capillary respirometer. This and other special methods will be discussed in the appropriate sections. Each type of experiment, unless otherwise noted, was performed on a minimum of five animals. THE CYCLE OF CARBON DIOXIDE RELEASE Figure 1 illustrates a typical experiment descriptive of the cyclic release of carbon dioxide. Here the respiratory exchange of a Cecropia pupa was measured over two successive 18-hour intervals. During the first period of 18 hours, sodium to LJ 1400 i- 1200 1000 O 800 UJ UJ cc o UJ o UJ 600 400 200 o With NoOH (02 Uptoke). With HCI (02 Uptake ••- COgOutput) 8 10 14 16 18 HOUR 5 FK;UKE 1. The gas exchange of a Cecropia pupa over two successive 18-hour intervals. The upper curve (open circles) records measurements performed in the presence of alkali; for the lower curve (solid circles) the alkali was replaced by acid. An apparent decrease in the rate of oxygen uptake followed by a slight increase was usually recorded at intervals which corresponded with the time of the carbon dioxide bursts. This result is an artifact due to inability of the alkali to absorb the large burst of CO2 as rapidly as it evolved. By employing a larger filter paper surface for CO2 absorption, this artifact could be almost completely eliminated. hydroxide was placed in the vessel to absorb the carbon dioxide and thereby permit measurements of oxygen consumption; the alkali was then replaced by acid and the measurements repeated. As recorded in Figure 1, in the presence of alkali the gas volume of the respirometer decreased steadily during the entire 18-hour period, save for occasional extremely minor variations. But when acid was present to prevent the absorption of carbon dioxide, the gas volume exhibited. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
