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Start Over Coverage 281-292

1. On the minimum of the work of interaction forces between a pseudoplate and a rigid obstacle

Creator:
Bock, Igor and Lovíšek, Ján
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
elliptic variational inequality, pseudoplate, thickness, optimal control, and penalization
Language:
English
Description:
An optimization problem for the unilateral contact between a pseudoplate and a rigid obstacle is considered. The variable thickness of the pseudoplate plays the role of a control variable. The cost functional is a regular functional only in the smooth case. The existence of an optimal thickness is verified. The penalized optimal control problem is considered in the general case.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Studies on the development of Procamallanus (Spirocamallanus) rebecae (Nematoda: Camallanidae), a parasite of cichlid fishes in Mexico

Creator:
Moravec, F., Mendoza-Franco, E., Vargas-Vázquez, J., and Vivas-Rodríguez, C.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Nematoda, Procamallanus, Spirocamallanus, Cichlasoma, Copepoda, development, paratenic hosts, and Mexico
Language:
English
Description:
A description is given of the life cycle of the nematode Procamallanus (Spirocamallanus) rebecae (Andrade-Salas, Pineda-Lopez et García-Magafia, 1994), an intestinal parasite of cichlids in Mexico. The copepod Mesocyclnps sp. was found to be a suitable experimental intermediate host. After the copepod’s ingestion of free first-stage larvae of the nematode, these enter the haemocoel of the intermediate host; they moult twice (on the 3rd and 5-6th day p.i. at 21-22”C) before they attain the third, infective stage. The third-stage larva already possesses the large buccal capsule without spiral thickenings and its tail tip bears three cuticular spines. The larvae undergo two additional moults (13-14 days and 42 days p.i.) in the definitive host (Cichlasoma urophthalmus) before changing to adults; the prepatent period is about 2-3 months. Experimental infection of guppies, Poecilia reticulata, have shown that these fishes may become paratenic (metaparatenic) hosts of this parasite. The morphology of individual larval stages of this nematode is described.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public