Using metal‐filled micropipette electrodes we have recorded responses from
single units in the optic tectum and optic chiasma of the goldfish. Responses
were evoked by visual stimulation with spots of light and with black discs of
various sizes. In many cases, after recording from a unit, the position of the
electrode tip was marked by making an electrolytic lesion 10‐50 µ in diameter.
These lesio... hiện toàn bộ
Lung irritant receptors in anaesthetized rabbits are stimulated by deflations
and large inflations of the lungs, with irregular and rather rapidly adapting
discharges. After deflation the spontaneous discharge of the receptors is
increased, and dynamic compliance is decreased. After inflation the spontaneous
discharge is decreased, and compliance is increased. The responses of the
receptors to inf... hiện toàn bộ
1. A new technique has been developed for the preparation of a permanent parotid
fistula in the sheep. The advantage over the Pavlov‐Glinski operation is that
the saliva drips from the dependent point of a skin teat. The secretion rate may
be unobtrusively observed without fixation of any apparatus to the animal.
Thirty‐seven sheep with parotid fistulæ have been studied.2. The presence of a
paroti... hiện toàn bộ
The results of the commonly accepted in vitro tests, made upon samples of stored
blood, are fallacious indicators of the state of preservation of biological
activity, as judged by the subsequent in vivo survival of the erythrocytes. In
the selection of preservative solutions, however, in vitro tests may have a
negative value. For instance, if blood hæmolyses rapidly in a given solution,
that solut... hiện toàn bộ
1. Observations made on dogs show that morphine sulphate administered during the
course of a water diuresis is antidiuretic, whether it is given intravenously
(0·08 mg./ kg.) to the unanæsthetized animal, or injected into the supraoptic
nuclei (4‐32 ug.) under chloralose ancesthesia.2. After section of the
supraoptic tracts the injection of morphine sulphate intravenously into the
unanæsthetized d... hiện toàn bộ
1. The influence of large doses of cortisone on the mitotic activity which
normally occurs after partial hepatectomy in mice was studied. At the same time
the changes in liver protein, fat, glycogen and nucleic acids were followed.2.
In the mice given cortisone, mitoses were rarely seen 2 days after operation,
whereas at that time the mitotic rate in controls was very high. Later, at 6
days, this ... hiện toàn bộ
Marjorie J. Dobson, W. Duane Brown, A. Dobson, A. T. Phillipson
1. The papillæ of the surface of the rumen of sheep have been shown to have a
rich blood and lymphatic supply in intimate contact with the basal layer of the
stratified squamous epithelium.2. The basal layer of the epithelium consists of
columnar cells which in the papillary bodies are arranged round the capillaries,
the long axis of the cells being perpendicular to the length of the capillaries.
... hiện toàn bộ
In cats anæsthetized with chloralose it was found that below about 18° C. the
rhythmic pattern of discharge in low‐threshold pulmonary stretch fibres is
reversed in relation to the respiratory cycle. This reversed pattern is
apparently responsible for the reversal of the Hering Breuer inflation reflex
(Head's paradoxical reflex). Evidence favouring this is that reflex inhibition
of respiration, pr... hiện toàn bộ
An isolated kidney obtained from a donor dog was perfused at constant pressure
with blood from the femoral artery of a recipient dog. The left atrial pressure
of the recipient dog was increased by approximately 20 cm H20 by inflating a
balloon in the left atrium. Left atrial distension caused an increase in urine
flow and sodium excretion from the isolated perfused kidney and on a few
occasions fr... hiện toàn bộ
1. Evidence is produced that the vagus controls the secretion of the cardiac and
pyloric mucous glands and the mucous neck cells of the fundal glands.2. A
histological procedure is described for staining these cells selectively and
intensely.3. No effect of vagal nerve stimulation on the surface epithelial
cells of the stomach has been seen.4. Innervated pyloric pouches cease to
secrete on starvat... hiện toàn bộ