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Chapter
Photometric Research on Magnetic Stars at the Catania Astrophysical Observatory
The results recently obtained at Catania from the observations of the magnetic stars SX Ari, 41 Tau, CUVir, HD 173 650, HD 184 905, HD 219 749, 8k Psc, HD 224 801 are summarized.
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Chapter
Relation Between Light Variations of Solar System Satellites and Their Interaction with Interplanetary Medium
The behaviour of the available light curves of Jupiter and Saturn satellites is shown to change steadily from inner to outer satellites.
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Chapter
Absolute Fluxes of K Chromospheric Emission on the H-R Diagram
Continuing our previous analysis of the chromospheric emission (Blanco et al.,1974), absolute fluxes of the K emission line have been evaluated from 10 Å mm−1 spectrograms of the O. C. Wilson collection for 31 F5...
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Article
IUE observations of cool stars: α Aurigae, HR1099, λ Andromedae, and ε Eridani
Initial IUE observations of four cool stars are reported. Observed fluxes and surface fluxes are given for several UV emission lines in the spectral range 1,175–2,000 Å, obtained at low and high dispersion wit...
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Article
IUE observations of an active region of HD206860
THE chromospheric Mg II h and k lines seem to have doubly reversed emission core in the spectra of the Sun and of solar and late type stars. In the solar spectrum the general appearance of Mg II h and k is very s...
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Article
1253A THE PATTERN OF BREATHING OF KITTENS DURING HYPOXIA
The reduction in (F,I,O2) in preterm infants and in anaesthetized kittens less than 35 days of age produces an increase in ventilation which is not sustained. This has been widely interpreted as respiratory failu...
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Chapter and Conference Paper
IUE Spectra of RS CVn Stars
The characteristic optical light curves of RS CVn — and BY Dra-type variables are believed to represent non-uniform distribution of dark spots akin to sunspots which are revealed by rotation. By analogy with t...
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Chapter and Conference Paper
Twenty Years of Dedicated Photometry of Rs CVn at Catania Observatory
We present a complete set of yearly seasonal light curves (LC) of RS CVn obtained from 1963 to 1982 at Catania Observatory, integrated with two LCs obtained by Ludington (1978) in 1975 and 1976. This unique ob...
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Chapter and Conference Paper
Features of the Wave-Like Distortion in Some RS CVn Binaries
One of the outstanding features of RS CVn-type binaries is the changing shape of the so called “wave-like distortion” or “photometric wave” (PW) and its phase migration on the light curve (LC). Here we present...
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Article
Interchangeability of repressors for the control of the uxu and uid operons in E. coli K12
The uidA and uxuAB operons are each under the dual control of two repressor molecules: the uidR and uxuR encoded repressors negatively control the uidA operon whereas the uxuAB operon is regulated by the uxuR and...
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Article
The regulatory region of the uxuAB operon in Escherichia coli K12
The uxuAB operon is composed of two genes coding for enzymes involved in hexuronate degradation. This operon is negatively controlled by the uxuR and exuR regulatory gene products. Starting from uxu hybrid plasmi...
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Chapter
Identification and Protection of Existing and Potential Observatory Sites
At the XIXth General Assembly our Commission held two meetings during the course of which the following papers were presented:
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Article
Infrared Studies of Surface Acidity and Reversible Folding in Palygorskite
The infrared absorption spectra of a palygorskite sample from Cáceres, Spain, showed two previously unreported bands in the OH-stretching region at 3420–3440 and 3220–3230 cm−1 after evacuation at 90°–230°C. Thes...
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Article
Probing Titan's atmosphere by stellar occultation
WE report results from the first stellar occultation by Titan ever observed. As predicted by Wasserman1, on 3 July 1989 the bright star 28 Sagittarii (visual magnitude, V ≈ 5.5), passed behind Saturn's giant moon...
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Article
Anti-immunoglobulin antibodies in children with Schönlein-Henoch syndrome. Absence of serum anti-IgA antibodies
Circulating immune complexes (CIC) that simultaneously contain IgG and IgA are frequently found in IgA nephropathy (IgA-N) and the Schönlein-Henoch syndrome (SHS). The presence of anti-immunoglobulin antibodie...
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Article
Influence of the clay and the nickel content in catalysts for vegetable oil hydrogenation
Nickel catalysts prepared using two different clays as support, natural bentonite and palygorskite, and with different nickel contents have been tested in the hydrogenation of a sunflower oil. The influence of...
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Article
Coating cracks in materials with general anisotropy
The problem of a straight crack lying in the coating of a semi-infinite substrate is considered. The most general case of anisotropy is assumed for both materials (coating and substrate). The solution of Atkin...
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Article
Physical studies of asteroids XXX: the asteroid 153 Hilda
The asteroid 153 Hilda was studied by photometric, spectroscopic and polarimetric observations during the apparition in 1992. The rotation period was determined to 5.11 hours with a lightcurve amplitude of 0.0...
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Chapter
Kinked cracks in anisotropic elastic materials
The problem of a kinked crack is analysed for the most general case of elastic anisotropy. The kinked crack is modelled by means of continuous distributions of dislocations which are assumed to be singular bot...
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Chapter
Observations of Mutual Events between Jupiter Satellites
As a contribution to the “PHEMU97” International Campaign, photoelectric observations of the mutual events between the Jupiter satellites are planned at the Astronomy Institute of Catania University. The pheno...
