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Start Over Coverage 59-63

2. Does the local dynamo act in sunspot groups?

Creator:
Bumba, V.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
astronomy, sunspot groups, and local magnetic field topology
Language:
Czech
Description:
We summarize our previous results concerning the local magnetic field formation, showing that its sunspot groups developing to reach higher typec C, D, E etc. continue their magnetic evolution during the period of new magnetic flux addition immediately after the first magnetically bipolar balanced stage. It is probably a magnetohydrodynamical process of magnetic field strenthening oř a new magnetic flux generation. It is dosely related to a specific singularity in the local magnetic field topology at the inner field boundary not far from the centre of the group, where the gulf of one polarity is compressed inbetween the boundary curvature of the field of opposite polarity and where large radial velocities can be observed. This is the region, where new peaks of both the leading and the following polarities in a speciál orthogonal relation of the new to the old tubes of lines of force develop, where the greatest field gradiente are formed. The flare frequencies and their importances correlate well with the degree of complexity of magnetic field topology in this situation. The important role of the photosphere in all these processes is underlined.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

4. Lucionema balatonense gen. et sp. п., a new nematode of a new family Lucionematidae fam. n. (Dracunculoidea) from the swim-bladder of the European pikeperch, Stizostedion lucioperca (Pisces)

Creator:
Moravec, František, Molnár, Kálmán, and Székely, Csaba
Format:
print
Type:
model:internalpart and TEXT
Subject:
Lucionema, nematode, parasite, Stizostedion, Hungary, and Lake Balaton
Language:
English
Description:
A new nematode genus and species, Lucionema balatonense gen. et sp. п., is described from the swimbladder of the European pikeperch, Stizostedion lucioperca (L.), from Lake Balaton in Hungary; a new dracunculoid family Lucionematidae fam. n. is established to accommodate it. The hitherto monotypie family Lucionematidae shows affinities with the families Skrja-billanidae and Daniconematidae, differing from them mainly in having simple oesophagus without external oesophageal glands and the vulva situated near the middle of body; from the first family also in the absence of the buccal capsule and the bursa-like caudal alae in the male. The genus Lucionema gen. n. is characterized mainly by the presence of 8 cephalic papillae in two circlets, absence of spicules, presence of the copulatory plate, only 2 pairs of postanal papillae in the male, and by the distal part of the monodelphic uterus forming a posteriorly directed coil. The body length of L. balatonense females is 1074-1782 pm, that of the only available male 770 pm. A key to the families of the Dracunculoidea is presented.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Some factors which influence the in vitro maintenance of Anisakis simplex (Nematoda)

Creator:
Iglesias, Luis, Valero, Adela, and Adroher, Francisco-Javier
Format:
print
Type:
model:internalpart and TEXT
Subject:
Anisakis simplex, culture media, survival, and moulting
Language:
English
Description:
Several culture media as well as some factors that may affect the in vitro development of the nematode Anisakis simplex Rudolphi, 1809 have been studied. After testing six media and four temperatures, the conditions for the in vitro culture selected were as follows: RPML1640 + 20% (v/v) heat-inactived fetal bovine serum or Meyer’s М3 (without agar) media, at 37"C, under 5% C02 in air atmosphere, and renewal of the medium twice a week. The average survival rates of the larvae were significantly increased when the pH of the culture medium was increased (from 4.0 to 7.2) or decreased (from 7.2 to 4,0) after L, to L4 moulting. The length of the larvae at the onset of culture affected the survival and moulting of themselves, but these were culture medium-dependent. On the other hand, we have observed that several L, and L, were attached, by means of a brown unknown substance apparently secreted by themselves, to the bottom of the substratum. Frequently, when a larva was spontaneously detached, a “cap” of the brown substance blocked, apparently, its mouth. The possible absorption of nutrients through the L, larvae cuticle of A. simplex is discussed.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Two new species of Protogyrodactylus (Monogenoidea: Dactylogyridae) from the gills of Gerres nigri (Teleostei: Gerreidae) from Senegal

Creator:
Boeger, Walter A., Diamanka, Arfang, Pariselle, Antoine, and Patella, Luciana
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Protogyrodactylus, Gerres nigri, Senegal, Protogyrodactylus ethiopicus, and Protogyrodactylus kritskyi
Language:
English
Description:
Protogyrodactylus ethiopicus sp. n. and P. kritskyi sp. n. are described from the gills of Gerres nigri Günther (Gerreidae, Perciformes) captured from the estuary of the Sine-Saloum River (Senegal, West Africa). These new species differ from previously described species within the genus by a mid- or dextro-ventral vaginal opening (dextral in all other species). They are part of a morphological species group within Protogyrodactylus Johnston et Tiegs, 1922 that has the tip of the superficial root of the ventral anchor resembling a hook and two anterior projections on the anterior margin of the ventral bar. Protogyrodactylus ethiopicus differs from the remaining species in this group mainly by the morphology of the base of the male copulatory organ (MCO), which is disk-shaped, and the shape of the anterior projections of the ventral bar (round in the new species and relatively elongate in the other species of the group). The other new species, P. kritskyi, differs from all others in the same morphological group in having a MCO with a greatly expanded base that bears a heel-like subterminal sclerotization.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public