46 research outputs found

    A Simple Electronic Apparatus to Record Continuously Changes in Pupillary Size

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    Chopped infra-red light is beamed at the iris and pupil and the infra-red light reflected gathered by a photo-transistor. A continuous pen recording of changes in reflectance is obtained which can be related to changes in pupil size. </jats:p

    How and why Opcw Came to the Hague

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    Paleosols and Their Relevance to Precambrian Atmospheric Composition: A Discussion

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    The Flin Flon Paleosol and the composition of the atmosphere 1.8 BYBP

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    The Effect of Posterior Lobe Pituitary Extracts On the Blood Pressure of <i>Ornithorhynchus</i> (Duck-Billed Platypus)

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    ABSTRACT The carotid blood-pressure response to intravenous injection of histamine-free extracts of mammalian posterior pituitary extracts in the platypus (Ornithorhynchus) is described. Pitressin evokes a simple pressor response. Pitocin evokes a simple depressor response. Mixtures of pitressin and pitocin evoke a fall and a subsequent rise. Histamine evokes a depressor response. A preliminary note is made of the simple pressor response to pitressin and depression to pitocin in the deeply-anaesthetized bird and in a lizard. Comparison is made between the responses to posterior pituitary extracts in reptiles, birds, the platypus and eutheria. The possible phylogenetic significance of these observations is discussed.</jats:p
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