Nothobomolochus cresseyi sp. n. (Copepoda: Bomolochidae), a parasite from gills of the engraulid fish Engraulis anchoita Hubbs et Marini (Pisces: Engraulidae) from the coast of Argentina, is described and illustrated. The new species can be distinguished from other species of Nothobomolochus Vervoort, 1962 by the following combination of characters: three modified setae on the base of the antennule similar in length to the plumose setae, the nature of the armature of the third segment of the fourth endopod and the length and width of the thoracic somites 2 to 4 decreasing gradually. The new species represents the first record of this genus for Argentina.
Capillaria (Hepatocapillaria) cichlasomae sp. п., parasitic in the liver of the cichlid Cichlasoma urophthalmus (Günther) from a small freshwater lake ("aguada") Xpoc in Yucatan, Mexico, is described. The parasite is characterized mainly by its small body size (male 1.8 mm, female 4.5 mm), the structure of the stichosome (markedly short stichocytes in one row) and the male (the presence of a pair of small subventral postanal papillae) and female (anus distinctly subterminal) caudal ends, and by the size and structure of the spicule (spicule 0.068-0.085 mm long, with marked transverse grooves on surface) and eggs (size 0.053-0.058 x 0.023 mm, with protruding polar plugs). This is the second known Capillaria species from the liver of fish and the first one from the liver of a freshwater fish.
Earlier results concerning sympathetic flares and time-correlated rádio bursts are compared with the history and dynamics of development of the magnetic situation in active regions with related flaring. An attempt to present observational evidence of the existence of sympathetic flares is made. We are trying to demonstrate that active regions producing such flares are physically related through common dynamical elements whose magnetic fields display parallel evolution.
Aus den photographischen und visuellen Kometenhelligkeiten werden die photometrischen Parameter m0 und n berechnet. Es zeigt sichm dass die absolute Helligkeit der durchschnittlichen Grösse m0 der meisten Kometen gleich sind. Der Exponent n ist aber verhältnissmassig klein, nesonders für die visuellen Beobachtungen. Der Farbenindex änderte sich mit wachsendem Abstand des Kometen von der Sonne.
All well-investigated very young and massive stars with optically thick circumstellar shells (BN-like objects) show the sillicate feature near 9.5 μm. In addition to the only BN object known in the pre-IRAS era to show the 18-μm feature in absorption our search through the IRAS LRS catalogue revealed two other objects of this type:GL 2591 and S 140-IRS. The IR point source GL 961 which is classified in the IRAS scheme as an object with a red spectrum and no 10-μm band (IRAS class 5n) was shown to be a BN object with a typical self-absorption profile in the 10-μm region and an optical depth in the band centre of about 2.5.
In the IRAS Point Source Catalogue we found nine BN-like objects with good flux quality and no confusion by extended sources. The energy distributions of all show a steep increase from 12 μm towards 100 μm. The colour indices defined by Rij = log (2iSi / iSi) (i, j = 1 : 12 μm ; i=2 : 25 μm ; i =3 : 60 μm ; i=4 : 100 μm) are in the ranges 0.0≤ R12≤1.0, 0.0≤R23≤0.5, and -0.2≤R34≤0.2. R12 and R34 are similar to the indices derived from IRAS data for IR objects with H2O masers in the Orion and Cepheus regions. For R23 the range occupied by BN-like objects seems to be narrower. Radiative transfer calculations show that the flux below 25 μm can be produced by a compact circumstellar dust shell. The IRAS observations for 1≥25 μm ca II for a second and more extended cold envelope.