• Publications
  • Influence
An almost head-on collision as the origin of two off-centre rings in the Andromeda galaxy
The unusual morphology of the Andromeda galaxy (Messier 31, the closest spiral galaxy to the Milky Way) has long been an enigma. Although regarded for decades as showing little evidence of a violentExpand
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A Dust-penetrated Classification Scheme for Bars as Inferred from Their Gravitational Force Fields
The division of galaxies into "barred" (SB) and "normal" (S) spirals is a fundamental aspect of the Hubble galaxy classification system. This "tuning fork" view was revised by de Vaucouleurs, whoseExpand
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Gravitational Bar and Spiral Arm Torques from K s -band Observations and Implications for the Pattern Speeds
We have obtained deep near-infrared Ks-band William Herschel Telescope observations of a sample of 15 nearby spiral galaxies having a range of Hubble types and apparent bar strengths. TheExpand
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The Gravitational Torque of Bars in Optically Unbarred and Barred Galaxies
The relative bar torques for 45 galaxies observed at K-band with the 4.2 m William Herschel Telescope are determined by transforming the light distributions into potentials and deriving the maximumExpand
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The quest for competence.
  • D. Block
  • Medicine
  • Journal of occupational medicine. : official…
  • 1977
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A TECHNIQUE FOR SEPARATING THE GRAVITATIONAL TORQUES OF BARS AND SPIRALS IN DISK GALAXIES
We describe a Fourier-based method of separating bars from spirals in near-infrared images. The method takes advantage of the fact that a bar is typically a feature with a relatively fixed positionExpand
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Effects of bronchitis and occupation on pulmonary ventilation over an 11-year period.
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Placental 17β-hydroxysteroid oxidoreductase, lactate dehydrogenase and malate dehydrogenase during the latter half of pregnancy in the mouse
The specific activity of 17 beta-hydroxysteroid oxidoreductase (17-HOR) with estradiol-17 beta (E2), estrone (E1) and testosterone (T), as well as that of lactate dehydrogenase (LDH) and malateExpand
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Absenteeism experience in a group of employed diabetics.
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