Volume 52, Issue 2
August 1960, pages 33-72
pp 33-42 August 1960
1. Frog’s heart (Rana tigrina) contains more noradrenaline than adrenaline.
2. Spontaneously beating frog’s heart releases adrenaline and noradrenaline.
3. Stimulation of the sympathetic nerves releases adrenaline as well as noradrenaline.
4. After fatigue of the sympathetic nerves by maximal stimulation for one hour, direct electrical stimulation releases adrenaline and noradrenaline in amounts greater than can be released by nervous stimulation. These hormones therefore can originate from muscle cells.
pp 43-48 August 1960
1. The fission of ATP and phosphocreatine in frog’s stomach muscle has been studied.
2. In winter, there is no decrease in the concentration of ATP or phosphocreatine due to contraction induced by potassium chloride.
3. In summer, when the muscle is more active and shows frequent spontaneous contractions, there is breakdown of phosphocreatine, but if these muscles are cooled to 0°C.; then there is no change in phosphocreatine content.
4. These experiments suggest that ATP is not the primary substance that supplies energy for contraction in unstriated muscle.
pp 49-53 August 1960
pp 54-65 August 1960
1. Chætotaxy of the soldier of the termite,Odontotermes (Odontotermes) assmuthi Holmgren, is described.
2. The arrangement of bristles on the head and the abdomen inO. assmuthi closely resembles that ofO. obesus andO. horni.
3. The labrum in the present species carries fewer pairs of labral bristles than inO. obesus andO. horni.
4. The mesonotum and the metanotum in the present species show a more regular arrangement of bristles than inO. obesus; inO. horni the bristles are distributed irregularly.
pp 66-72 August 1960
1. Oxygen has been injected intravenously into dogs during hypothermia.
2. There was no significant difference between the amount of oxygen that could be injected at 37° C. and at 27–28°C. But at the latter temperature, owing to reduction in metabolism, about 40–70% of the oxygen requirements of the animal could be met by intravenous oxygen.
3. At 24–25°C., slightly greater quantity of oxygen could be injected than at 27–28°C., but owing to greater reduction in metabolism, the entire oxygen requirement of the animal could be met by the intravenous route.