. The comparative physiology of respiratory mechanisms. Respiration. TRACHEAL RESPIRATION 12: Wigglesworth (1929, 1930, 1931) has shown that any increase in osmotic concentration has the effect anticipated. Fig. 69 shows the effect of hypertonic potassium lactate on the air filling of tracheoles in an Aeschna larva. In the firefly (Photuris pennsylvanicus) and in the European Lampyrida the tracheal system of the segments bearing the light organs is independent of that of the rest of the body, and their. Fig. 69. A, tracheal endings in mid-gut of Aeschna larva just after dissection, B, after ap
. The comparative physiology of respiratory mechanisms. Respiration. TRACHEAL RESPIRATION 12: Wigglesworth (1929, 1930, 1931) has shown that any increase in osmotic concentration has the effect anticipated. Fig. 69 shows the effect of hypertonic potassium lactate on the air filling of tracheoles in an Aeschna larva. In the firefly (Photuris pennsylvanicus) and in the European Lampyrida the tracheal system of the segments bearing the light organs is independent of that of the rest of the body, and their. Fig. 69. A, tracheal endings in mid-gut of Aeschna larva just after dissection, B, after application of 3% potassium lactate. (Wigglesworth.) spiracles are kept closed during the daytime. The flashes of light are initiated from the central nervous system, and Maluf (Maleouf, 1938) has brought forward good evidence to show that the mechanism is a sudden increase in osmotic pressure in the light-producing cells, causing the absorption of tracheolar fluid and an increased access of oxygen. Maluf finds that injection of hypertonic substances produces a continuous glow. A different conception of the mechanism regulating the movement of tracheolar fluid was put forward quite recently by T. Bult (1939) and supported by many experiments all made on the same object, the isolated mid-gut of the cockroach Phyllodromia germanica. According to Bult, the tracheole walls are incompletely wetted by water and the effect of capillarity therefore quite low. Evidence is presented to show that the movements are caused by swelling of proteins within cells,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectrespiration
